EP2396546A1 - Motor pump unit - Google Patents

Motor pump unit

Info

Publication number
EP2396546A1
EP2396546A1 EP10702858A EP10702858A EP2396546A1 EP 2396546 A1 EP2396546 A1 EP 2396546A1 EP 10702858 A EP10702858 A EP 10702858A EP 10702858 A EP10702858 A EP 10702858A EP 2396546 A1 EP2396546 A1 EP 2396546A1
Authority
EP
European Patent Office
Prior art keywords
motor
pump
housing
annular space
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.)
Withdrawn
Application number
EP10702858A
Other languages
German (de)
French (fr)
Inventor
Walter Schiffhauer
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
Publication of EP2396546A1 publication Critical patent/EP2396546A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/064—Cooling by a cooling jacket in the pump casing
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
    • B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
    • B08B2203/0223—Electric motor pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
    • B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
    • B08B2203/027—Pump details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
    • B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
    • B08B2203/0294—Wobbling swash plates for high pressure cleaners
    • 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
    • F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the invention relates to a motor pump unit for a high-pressure cleaner with a liquid-cooled electric motor and a pump, wherein the electric motor has a pot-shaped motor housing, which is surrounded by an annulus forming an annular space inlet and an annular space of a cooling housing, and wherein the pump with a
  • Annular inlet connected suction inlet for sucking liquid and a pressure outlet for dispensing liquid and wherein the pump to be conveyed by the liquid is supplied to the annular space inlet.
  • Such motor pump units are known from DE 10 2007 009 394 Al. 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 or a spray nozzle. 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 takes place 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 between the motor housing and the cooling housing, an annular space is formed, which can be supplied via an annulus inlet liquid.
  • the liquid can flow through the annulus and through the annulus outlet get to the suction inlet of the pump, so that they can then be put under pressure.
  • the pump will be connected to a public water supply network.
  • the liquid In the water supply network, the liquid is subject to a delivery pressure of a few bar, for example 3 to 10 bar. This has the consequence that also prevails within the annulus of the pressure prevailing in the water supply network discharge pressure.
  • This in turn requires that the motor housing from the liquid is subjected to a considerable, radially inwardly directed pressure.
  • the engine case must withstand this pressure.
  • Object of the present invention is to develop a motor pump unit of the type mentioned in such a way that the motor housing have the lowest possible wall thickness and yet can be effectively cooled over a large area.
  • a motor pump unit of the generic type according to the invention in that the motor housing is designed as a one-piece deep-drawn part, which in a front shell region on stator laminations the electric motor rests and is arranged in a rear jacket region at a distance from the rear winding heads of the stator and in the rear jacket region has stiffness-increasing depressions, wherein both the front and the rear jacket region are surrounded by the annular space.
  • the motor housing used according to the invention is manufactured as a one-piece deep-drawn part, that is, it is formed by deep drawing of a relatively thin sheet. It has a jacket and a bottom, the jacket being surrounded by the annular space over virtually its entire length, through which the liquid to be pressurized by the pump is passed.
  • the motor housing bears against stator laminations of the electric motor and is thereby supported in the radial direction.
  • a rear jacket area lacks a radial support of the motor housing, but takes the motor housing in the rear shell area a distance from the live rear winding heads of the stator. In this area, the motor housing has stiffness-increasing depressions. These effectively counteract deformation of the motor housing.
  • the annulus can therefore extend in the longitudinal direction of the motor over the entire jacket of the motor housing, so that a very good heat dissipation is ensured without the risk that the motor housing is deformed in the rear shell area by the fluid pressure.
  • the stiffness-increasing depressions can be configured, for example, as an annular groove or knurling. However, it is of particular advantage if the stiffness-increasing recesses are formed in the form of beads.
  • the beads are favorably aligned in the longitudinal direction of the electric motor. tet. They extend in the longitudinal direction advantageously over the entire rear cladding region of the motor housing, which is arranged at a distance from the rear winding heads of the stator.
  • the motor housing on the side facing away from the pump of the stiffness-increasing recesses forms a sealing surface on which a sealing ring bears sealingly.
  • the sealing ring limits the annular space in the axial direction. He therefore prefers to close at a short distance to the stiffness-enhancing wells.
  • the motor housing on the side facing away from the pump of the wells has a concentric with the motor shaft aligned collar, which forms a sealing surface for a sealing ring.
  • the voltage applied to the sealing surface sealing ring is preferably clamped radially between the motor housing and the cooling housing. This simplifies the assembly of the motor pump unit. In addition, can be compensated by the radial loading of the sealing ring manufacturing tolerances of the motor housing and the cooling housing in terms of their concentricity.
  • the cooling housing is designed as a cylinder jacket-shaped plastic part which can be pushed onto the motor housing in the axial direction and which has a cylinder jacket-shaped sealing surfaces aligned concentrically with the motor shaft in a front region facing the pump and a rear region facing away from the pump in each case bears a strained in the radial direction sealing ring for sealing the annular space.
  • the plastic be pushed cooling housing with the interposition of a front and a rear sealing ring on the motor housing.
  • an annular space is formed along the lateral surface of the motor housing, which is sealed axially by the two sealing rings.
  • the radial loading of the sealing rings not only simplifies the assembly of the motor pump unit but also allows, as already explained, to compensate for manufacturing tolerances of the motor housing and the cooling housing in terms of their concentricity.
  • the cooling housing comprises in its end region facing away from the pump an annular projection which defines a cylinder jacket-shaped sealing surface for abutment of a sealing ring.
  • the sealing surface of the attachment is arranged in the radial direction at the same height as the bottom of the rigidity-increasing depressions.
  • a connection nipple oriented parallel to the motor shaft is arranged on the annular space inlet and / or the annular space outlet, which can be connected in a fluid-tight manner to a cooling channel of a drive housing of the pump when the cooling housing is pushed onto the motor housing.
  • a fluid-tight connection between the annular space inlet and / or the annular space outlet and a cooling channel of the drive housing is thus simultaneously produced.
  • the provision of the at least one cooling channel makes it possible for the pump to be pressurized by the pump liquid also for direct cooling of the drive housing use.
  • the cooling passage can be connected in a simple manner to the annular space inlet or the annular space outlet by the cooling housing being pushed onto the motor housing in the axial direction.
  • both the annular space inlet and the annular space outlet are connected to a cooling channel of the drive housing.
  • the liquid to be conveyed first flows through a first cooling channel of the drive housing, then enters the annular space surrounding the motor housing via the annular space inlet and flows via the annular space outlet and the second cooling channel of the drive housing adjoining it to the suction inlet.
  • the latter can be connected via a connecting line with the annulus outlet.
  • FIG. 1 is a partial sectional view of a motor pump unit
  • Figure 2 is a sectional view taken along the line 2-2 in Figure 1;
  • Figure 3 is a side view of a motor housing of the electric motor of the motor pump unit of Figure 1 and
  • FIG. 4 shows a perspective illustration of the motor housing from FIG. 3.
  • 1 shows schematically a motor pump unit 10 according to the invention with a liquid-cooled electric motor 11, which is designed as an asynchronous motor, and with a pump 12, which is driven by the electric motor 11.
  • the electric motor 11 has in the usual way a rotor 14 which is surrounded by a stator 15.
  • the stator 15 comprises stator windings 16, which are held on stator plates 17 and form the pump 12 facing front winding heads 18 and the pump 12 facing away from the rear winding heads 19.
  • the electric motor 11 has a cup-shaped motor housing 22 which is formed by deep drawing of a sheet metal. It comprises a cylindrical shell 23 and a bottom 24. In the bottom 24, a receptacle 26 is formed centrally, which receives a first bearing 27 of a motor shaft 29. A second bearing 31 of the motor shaft 29 is held on a bearing plate 33 which is integrally formed on a drive housing 35 of the pump 12.
  • a front shell portion 37 of the jacket 23 of the motor housing 22 is located directly on the stator lugs 17, and in a rear shell portion 38 surrounds the motor housing 22 at a radial distance the rear winding heads 19 of the stator 15.
  • the motor housing 22 in the circumferential direction in uniformly spaced from each other a plurality of stiffness-enhancing depressions in the form of longitudinal beads 40 on.
  • the longitudinal beads 40 extend in the direction away from the pump as far as an arcuate transition region 42, to which a collar 44 aligned concentrically with the motor shaft 29 adjoins.
  • This forms an engine-side cylinder jacket-shaped rear sealing surface 45, against which a rear sealing ring 46 abuts.
  • To the engine-side rear sealing surface 45th joins the bottom 24.
  • This has in a central receptacle 26 surrounding the annular bottom portion 48 a plurality of radially extending grooves 49 which increase the rigidity of the bottom 24 of the motor housing 22.
  • the motor housing 22 forms an outwardly projecting annular flange 51, to which the pump 12 facing away from an engine-side cylinder jacket-shaped front sealing surface 52 connects, on which a front sealing ring 53 abuts.
  • the motor housing 22 is surrounded in the circumferential direction by a cooling housing 55 made of plastic, which is formed in a cylinder jacket and pushed onto the motor housing 22 in the axial direction.
  • a concentric with the collar 44 aligned approach 57 of the cooling housing 55 dedefiniert a corresponding with the rear sealing surface 45 of the motor housing 22 rear sealing surface 58 of the cooling housing 55.
  • the rear sealing ring 46 is radially clamped.
  • a cylinder jacket-shaped front sealing surface 59 of the cooling housing 55 surrounds the front sealing surface 52 of the motor housing 22. Between the front sealing surfaces 52 and 59, the front sealing ring 53 is radially braced.
  • annular space 60 surrounding the motor housing 22 extends in the circumferential direction, to which liquid can be supplied via an annular space inlet 61 and from which the liquid can flow out via an annular space outlet 62.
  • a first cooling channel 64 of the drive housing 35 is arranged, and downstream of the annular space outlet 62, a second cooling channel 65 of the drive housing 35 connects.
  • the two cooling channels 64 and 65 are each connected in one piece via a heat-conducting rib 66 to a base body 68 of the drive housing 35. As a result, a particularly good heat conduction from the base body 68 to the cooling channels 64, 65 is achieved.
  • the main body 68 surrounds a wobble drive 70 held on the motor shaft 29 with a swashplate 71.
  • the main body 68 surrounds the piston 73 of the pump 12 abutting the swashplate 71 on the front side.
  • the pistons 73 are arranged at a distance from the swashplate 71 for clarity. In fact, they abut against the swash plate 71 and are driven by this to a reciprocating motion.
  • the pistons 73 With their ends facing away from the swash plate 71, the pistons 73 dive into a pumping space in the usual way, so that due to the reciprocating motion of the pistons, liquid is sucked into the pump chamber from a suction inlet 75 of the pump 12 and after a compression stroke of the pistons 73 can be output via a pressure outlet 76 of the pump 12.
  • the suction inlet 75 is connected via a connecting line 78 of a line arrangement 80 with the second cooling channel 65 of the drive housing 35.
  • the line arrangement 80 also has a feed line 82, which can be supplied with liquid via a pipe stub 84.
  • the liquid to be pressurized by the pump 12 first flows through the pipe socket 84 and the supply line 82 and the first cooling channel 64, then enters via the annular space inlet 61 in the annular space 60, flows around the motor housing 22 within the annular space 60 and enters the second cooling channel 65 via the annular space outlet 62. From this, the liquid is supplied via the connecting line 78 to the suction inlet 75, so that it can then be pressurized by the pump 12.
  • the liquid flowing through the cooling channels 64 and 65 and the annular space 60 absorbs waste heat from the drive housing 35 and from the motor housing 22.
  • the drive housing 35 and the motor housing 22 are thus effectively cooled.
  • the pipe socket 84 is in many cases connected to a pressurized water supply network. This has the consequence that the liquid flowing into the annular space 60 is already under a pressure of a few bar, for example under a pressure of 3 to 10 bar.
  • the practically over his entire length surrounded by the annular space 60 jacket 23 of the motor housing 22 is therefore subject to a not inconsiderable pressure load.
  • the jacket 23 In the area of the front jacket section 37, the jacket 23 abuts directly against the stator laminations 17 and is reliably supported by them. However, in the area of the rear winding heads 19, the jacket 23 does not undergo such a change
  • the stiffness-increasing longitudinal beads 40 are formed in the motor housing 22 in the rear jacket section 38. It has been found that, as a result of this, the motor housing 22 can reliably withstand a pressure load, such as is usually present in public water supply networks, even with prolonged use of the motor pump unit 10.
  • the annular space 60 can therefore extend over the entire length of the jacket 23 of the motor housing 22 and not just about the front jacket portion 37, which undergoes a support by the stator laminations 17. The thus enlarged annular space 60 leads to a particularly effective cooling of the electric motor 11.
  • the motor pump unit 10 since the drive housing 35 and this particular the bearing plate 33 and the wobble drive 70 are cooled by the liquid to be conveyed, the motor pump unit 10 according to the invention is characterized by a particularly effective Cooling off. Even if the motor pump unit 10 is surrounded by a housing without Zu Kunststoff- and exhaust openings, there is no risk of overheating. The motor pump unit 10 is therefore particularly suitable for use in splash-proof housings of high-pressure cleaning devices.

Abstract

The invention relates to a motor pump unit for a high pressure cleaning device having an electrical motor and a pump, wherein the electrical motor has a motor housing that is surrounded by a cooling housing forming a ring space having a ring space inlet and a ring space outlet, wherein the pump has a suction inlet connected to the ring space outlet and a pressure outlet and the fluid to be conveyed by the pump can be supplied to the ring space inlet. In order to further form the motor pump unit such that the motor housing has a thin wall thickness and can still be effectively cooled over a large surface region, the motor housing is designed as a one-piece deep-draw part according to the invention that contacts stator plates of the electrical motor in a front sheath region and is arranged at a distance to the rear coil heads of the stator in a rear sheath region and has stiffness increasing recesses in the rear sheath region, wherein the front and the rear sheath region are surrounded by the ring space.

Description

Motorpumpeneinheit Motor pump unit
Die Erfindung betrifft eine Motorpumpeneinheit für ein Hochdruckreinigungsgerät mit einem flüssigkeitsgekühlten Elektromotor und einer Pumpe, wobei der Elektromotor ein topfförmiges Motorgehäuse aufweist, das unter Ausbildung eines Ringraums mit einem Ringraumeinlass und einem Ringraumauslass von einem Kühlgehäuse umgeben ist, und wobei die Pumpe einen mit demThe invention relates to a motor pump unit for a high-pressure cleaner with a liquid-cooled electric motor and a pump, wherein the electric motor has a pot-shaped motor housing, which is surrounded by an annulus forming an annular space inlet and an annular space of a cooling housing, and wherein the pump with a
Ringraumauslass verbundenen Saugeinlass zum Ansaugen von Flüssigkeit und einen Druckauslass zum Abgeben von Flüssigkeit aufweist und wobei die von der Pumpe zu fördernde Flüssigkeit dem Ringraumeinlass zuführbar ist.Annular inlet connected suction inlet for sucking liquid and a pressure outlet for dispensing liquid and wherein the pump to be conveyed by the liquid is supplied to the annular space inlet.
Derartige Motorpumpeneinheiten sind aus der DE 10 2007 009 394 Al bekannt. Sie kommen bei Hochdruckreinigungsgeräten zum Einsatz, bei denen eine Flüssigkeit, vorzugsweise Wasser, unter Druck gesetzt und anschließend über den Druckauslass abgegeben werden kann. An den Druckauslass kann ein Hochdruckschlauch angeschlossen werden, der an seinem freien Ende bei- spielsweise eine Sprühlanze oder eine Sprühdüse trägt. Dies gibt die Möglichkeit, einen unter Hochdruck stehenden Flüssigkeitsstrahl auf einen Gegenstand zu richten, beispielsweise um den Gegenstand zu reinigen.Such motor pump units are known from DE 10 2007 009 394 Al. 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 or a spray nozzle. This provides the ability to direct a high pressure jet of liquid at an object, for example, to clean the object.
Der Antrieb der Pumpe erfolgt mittels eines Elektromotors, der von der Flüs- sigkeit gekühlt wird, die der Pumpe zugeführt wird. Hierzu ist das Motorgehäuse von einem zylindermantelförmigen Kühlgehäuse umgeben, wobei zwischen dem Motorgehäuse und dem Kühlgehäuse ein Ringraum ausgebildet ist, dem über einen Ringraumeinlass Flüssigkeit zugeführt werden kann. Die Flüssigkeit kann den Ringraum durchströmen und über den Ringraumauslass zum Saugeinlass der Pumpe gelangen, so dass sie anschließend unter Druck gesetzt werden kann.The drive of the pump takes place by means of an electric motor, which is cooled by the liquid, which is supplied to the pump. For this purpose, the motor housing is surrounded by a cylinder jacket-shaped cooling housing, wherein between the motor housing and the cooling housing, an annular space is formed, which can be supplied via an annulus inlet liquid. The liquid can flow through the annulus and through the annulus outlet get to the suction inlet of the pump, so that they can then be put under pressure.
In vielen Fällen wird die Pumpe an ein öffentliches Wasserversorgungsnetz angeschlossen. Im Wasserversorgungsnetz unterliegt die Flüssigkeit einem Förderdruck von einigen bar, beispielsweise 3 bis 10 bar. Dies hat zur Folge, dass auch innerhalb des Ringraums der im Wasserversorgungsnetz herrschende Förderdruck herrscht. Dies wiederum bedingt, dass das Motorgehäuse von der Flüssigkeit mit einem beachtlichen, radial einwärts gerichteten Druck beaufschlagt ist. Das Motorghäuse muss diesem Druck standhalten. Es soll allerdings aus Fertigungsgründen eine möglichst geringe Wandstärke aufweisen. Es besteht deshalb die Gefahr, dass das Motorgehäuse durch den im Ringraum herrschenden Flüssigkeitsdruck beschädigt wird, sofern sich der Ringraum über Bereiche des Motorgehäuses erstreckt, die vom Stator des Elektromotors innenseitig nicht abgestützt sind. Dem könnte entgegengewirkt werden, indem sich der Ringraum nur über einen Teilbereich des Mantels des Motorgehäuses erstreckt. Dies hätte aber eine eingeschränkte Kühlwirkung zur Folge.In many cases the pump will be connected to a public water supply network. In the water supply network, the liquid is subject to a delivery pressure of a few bar, for example 3 to 10 bar. This has the consequence that also prevails within the annulus of the pressure prevailing in the water supply network discharge pressure. This in turn requires that the motor housing from the liquid is subjected to a considerable, radially inwardly directed pressure. The engine case must withstand this pressure. However, it should have the smallest possible wall thickness for manufacturing reasons. There is therefore the risk that the motor housing is damaged by the fluid pressure prevailing in the annular space, provided that the annular space extends over areas of the motor housing, which are not supported on the inside by the stator of the electric motor. This could be counteracted by extending the annular space only over a portion of the jacket of the motor housing. But this would have a limited cooling effect.
Aufgabe der vorliegenden Erfindung ist es, eine Motorpumpeneinheit der eingangs genannten Art derart weiterzubilden, dass das Motorgehäuse eine möglichst geringe Wandstärke aufweisen und dennoch wirkungsvoll über einen großen Flächenbereich gekühlt werden kann.Object of the present invention is to develop a motor pump unit of the type mentioned in such a way that the motor housing have the lowest possible wall thickness and yet can be effectively cooled over a large area.
Diese Aufgabe wird bei einer Motorpumpeneinheit der gattungsgemäßen Art erfindungsgemäß dadurch gelöst, dass das Motorgehäuse als einteiliges Tiefziehteil ausgestaltet ist, das in einem vorderen Mantelbereich an Statorblechen des Elektromotors anliegt und in einem hinteren Mantelbereich im Abstand zu hinteren Wicklungsköpfen des Stators angeordnet ist und im hinteren Mantelbereich steifigkeitserhöhende Vertiefungen aufweist, wobei sowohl der vordere als auch der hintere Mantelbereich vom Ringraum umgeben sind.This object is achieved in a motor pump unit of the generic type according to the invention in that the motor housing is designed as a one-piece deep-drawn part, which in a front shell region on stator laminations the electric motor rests and is arranged in a rear jacket region at a distance from the rear winding heads of the stator and in the rear jacket region has stiffness-increasing depressions, wherein both the front and the rear jacket region are surrounded by the annular space.
Das erfindungsgemäß zum Einsatz kommende Motorgehäuse ist als einteiliges Tiefziehteil gefertigt, das heißt es wird durch Tiefziehen aus einem verhältnismäßig dünnen Blech geformt. Es weist einen Mantel auf und einen Boden, wobei der Mantel praktisch über seine gesamte Länge vom Ringraum umgeben ist, durch den die von der Pumpe unter Druck zu setzende Flüssigkeit hindurchgeführt ist. In einem vorderen Mantelbereich liegt das Motorgehäuse an Statorblechen des Elektromotors an und wird dadurch in radialer Richtung abgestützt. In einem hinteren Mantelbereich fehlt jedoch eine radiale Abstützung des Motorgehäuses, vielmehr nimmt das Motorgehäuse im hinteren Mantelbereich einen Abstand zu den spannungsführenden hinteren Wicklungsköpfen des Stators ein. In diesem Bereich weist das Motorgehäuse steifigkeitserhöhende Vertiefungen auf. Diese wirken einer Verformung des Motorgehäuses wirksam entgegen. Der Ringraum kann sich deshalb in Längsrichtung des Motors über den gesamten Mantel des Motorgehäuses erstrecken, so dass eine sehr gute Wärmeabfuhr sichergestellt ist, ohne dass die Gefahr besteht, dass das Motorgehäuse im hinteren Mantelbereich durch den Flüssigkeitsdruck verformt wird.The motor housing used according to the invention is manufactured as a one-piece deep-drawn part, that is, it is formed by deep drawing of a relatively thin sheet. It has a jacket and a bottom, the jacket being surrounded by the annular space over virtually its entire length, through which the liquid to be pressurized by the pump is passed. In a front jacket region, the motor housing bears against stator laminations of the electric motor and is thereby supported in the radial direction. In a rear jacket area, however, lacks a radial support of the motor housing, but takes the motor housing in the rear shell area a distance from the live rear winding heads of the stator. In this area, the motor housing has stiffness-increasing depressions. These effectively counteract deformation of the motor housing. The annulus can therefore extend in the longitudinal direction of the motor over the entire jacket of the motor housing, so that a very good heat dissipation is ensured without the risk that the motor housing is deformed in the rear shell area by the fluid pressure.
Die steifigkeitserhöhenden Vertiefungen können beispielsweise als Ringnut oder Rändelung ausgestaltet sein. Von besonderem Vorteil ist es jedoch, wenn die steifigkeitserhöhenden Vertiefungen in Form von Sicken ausgebildet sind. Die Sicken sind günstigerweise in Längsrichtung des Elektromotors ausgerich- tet. Sie erstrecken sich in Längsrichtung vorteilhafterweise über den gesamten hinteren Mantelbereich des Motorgehäuses, der im Abstand zu den hinteren Wicklungsköpfen des Stators angeordnet ist.The stiffness-increasing depressions can be configured, for example, as an annular groove or knurling. However, it is of particular advantage if the stiffness-increasing recesses are formed in the form of beads. The beads are favorably aligned in the longitudinal direction of the electric motor. tet. They extend in the longitudinal direction advantageously over the entire rear cladding region of the motor housing, which is arranged at a distance from the rear winding heads of the stator.
Von Vorteil ist es, wenn das Motorgehäuse auf der der Pumpe abgewandten Seite der steifigkeitserhöhenden Vertiefungen eine Dichtfläche ausbildet, an der ein Dichtring dichtend anliegt. Der Dichtring begrenzt den Ringraum in axialer Richtung. Er schließt sich deshalb bevorzugt in kurzem Abstand an die steifigkeitserhöhenden Vertiefungen an.It is advantageous if the motor housing on the side facing away from the pump of the stiffness-increasing recesses forms a sealing surface on which a sealing ring bears sealingly. The sealing ring limits the annular space in the axial direction. He therefore prefers to close at a short distance to the stiffness-enhancing wells.
Es kann vorgesehen sein, dass das Motorgehäuse auf der der Pumpe abgewandten Seite der Vertiefungen einen konzentrisch zur Motorwelle ausgerichteten Kragen aufweist, der eine Dichtfläche für einen Dichtring ausbildet.It can be provided that the motor housing on the side facing away from the pump of the wells has a concentric with the motor shaft aligned collar, which forms a sealing surface for a sealing ring.
Der an der Dichtfläche anliegende Dichtring wird vorzugsweise radial zwischen dem Motorgehäuse und dem Kühlgehäuse eingespannt. Dies vereinfacht die Montage der Motorpumpeneinheit. Außerdem können durch die radiale Beaufschlagung des Dichtrings Fertigungstoleranzen des Motorgehäuses und des Kühlgehäuses im Hinblick auf deren Konzentrizität ausgeglichen werden.The voltage applied to the sealing surface sealing ring is preferably clamped radially between the motor housing and the cooling housing. This simplifies the assembly of the motor pump unit. In addition, can be compensated by the radial loading of the sealing ring manufacturing tolerances of the motor housing and the cooling housing in terms of their concentricity.
Von Vorteil ist es, wenn das Kühlgehäuse als zylindermantelförmiges Kunststoffteil ausgestaltet ist, das in axialer Richtung auf das Motorgehäuse aufschiebbar ist und das in einem der Pumpe zugewandten vorderen Bereich und einem der Pumpe abgewandten hinteren Bereich konzentrisch zur Motorwelle ausgerichtete, zylindermantelförmige Dichtflächen aufweist, an denen jeweils ein in radialer Richtung verspannter Dichtring zur Abdichtung des Ringraums anliegt. Zur Montage der Motorpumpeneinheit kann das aus Kunststoff gefer- tigte Kühlgehäuse unter Zwischenlage eines vorderen und eines hinteren Dichtrings auf das Motorgehäuse aufgeschoben werden. Hierbei bildet sich entlang der Mantelfläche des Motorgehäuses ein Ringraum aus, der axial von den beiden Dichtringen abgedichtet wird. Die radiale Beaufschlagung der Dichtringe vereinfacht nicht nur die Montage der Motorpumpeneinheit sondern ermöglicht es auch, wie bereits erläutert, Fertigungstoleranzen des Motorgehäuses und des Kühlgehäuses im Hinblick auf deren Konzentrizität auszugleichen.It is advantageous if the cooling housing is designed as a cylinder jacket-shaped plastic part which can be pushed onto the motor housing in the axial direction and which has a cylinder jacket-shaped sealing surfaces aligned concentrically with the motor shaft in a front region facing the pump and a rear region facing away from the pump in each case bears a strained in the radial direction sealing ring for sealing the annular space. For mounting the motor pump unit, the plastic be pushed cooling housing with the interposition of a front and a rear sealing ring on the motor housing. Here, an annular space is formed along the lateral surface of the motor housing, which is sealed axially by the two sealing rings. The radial loading of the sealing rings not only simplifies the assembly of the motor pump unit but also allows, as already explained, to compensate for manufacturing tolerances of the motor housing and the cooling housing in terms of their concentricity.
Günstigerweise umfasst das Kühlgehäuse in seinem der Pumpe abgewandten Endbereich einen ringförmigen Ansatz, der eine zylindermantelförmige Dichtfläche definiert zur Anlage eines Dichtrings.Conveniently, the cooling housing comprises in its end region facing away from the pump an annular projection which defines a cylinder jacket-shaped sealing surface for abutment of a sealing ring.
Besonders günstig ist es, wenn die Dichtfläche des Ansatzes in radialer Rich- tung auf gleicher Höhe wie der Boden der steifigkeitserhöhenden Vertiefungen angeordnet ist.It is particularly favorable if the sealing surface of the attachment is arranged in the radial direction at the same height as the bottom of the rigidity-increasing depressions.
Bei einer besonders bevorzugten Ausführungsform der Erfindung ist am Ring- raumeinlass und/oder am Ringraumauslass ein parallel zur Motorwelle ausge- richteter Anschlussnippel angeordnet, der beim Aufschieben des Kühlgehäuses auf das Motorgehäuse flüssigkeitsdicht mit einem Kühlkanal eines Antriebsgehäuses der Pumpe verbindbar ist. Durch das Aufschieben des Kühlgehäuses auf das Motorgehäuse wird somit gleichzeitig auch eine flüssigkeitsdichte Verbindung zwischen dem Ringraumeinlass und/oder dem Ringraumauslass und einem Kühlkanal des Antriebsgehäuses hergestellt. Die Bereitstellung des mindestens einen Kühlkanals ermöglicht es, die von der Pumpe unter Druck zu setzende Flüssigkeit auch zur unmittelbaren Kühlung des Antriebsgehäuses einzusetzen. Der Kühlkanal ist hierbei auf einfache Weise an den Ringraum- einlass oder den Ringraumauslass anschließbar, indem das Kühlgehäuse in axialer Richtung auf das Motorgehäuse aufgeschoben wird.In a particularly preferred embodiment of the invention, a connection nipple oriented parallel to the motor shaft is arranged on the annular space inlet and / or the annular space outlet, which can be connected in a fluid-tight manner to a cooling channel of a drive housing of the pump when the cooling housing is pushed onto the motor housing. By sliding the cooling housing onto the motor housing, a fluid-tight connection between the annular space inlet and / or the annular space outlet and a cooling channel of the drive housing is thus simultaneously produced. The provision of the at least one cooling channel makes it possible for the pump to be pressurized by the pump liquid also for direct cooling of the drive housing use. The cooling passage can be connected in a simple manner to the annular space inlet or the annular space outlet by the cooling housing being pushed onto the motor housing in the axial direction.
Günstigerweise sind sowohl der Ringraumeinlass als auch der Ringraumauslass mit einem Kühlkanal des Antriebsgehäuses verbunden. Die zu fördernde Flüssigkeit durchströmt bei einer derartigen Ausgestaltung zunächst einen ersten Kühlkanal des Antriebsgehäuses, tritt dann über den Ringraumeinlass in den das Motorgehäuse umgebenden Ringraum und strömt über den Ringraumaus- lass und den sich daran anschließenden zweiten Kühlkanal des Antriebsgehäuses zum Saugeinlass. Letzterer kann über eine Verbindungsleitung mit dem Ringraumauslass verbunden sein.Conveniently, both the annular space inlet and the annular space outlet are connected to a cooling channel of the drive housing. In such an embodiment, the liquid to be conveyed first flows through a first cooling channel of the drive housing, then enters the annular space surrounding the motor housing via the annular space inlet and flows via the annular space outlet and the second cooling channel of the drive housing adjoining it to the suction inlet. The latter can be connected via a connecting line with the annulus outlet.
Die nachfolgende Beschreibung einer bevorzugten Ausführungsform der Erfin- düng dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen :The following description of a preferred embodiment of the invention düng is used in conjunction with the drawings for further explanation. Show it :
Figur 1 : eine Teilschnittansicht einer Motorpumpeneinheit;FIG. 1 is a partial sectional view of a motor pump unit;
Figur 2: eine Schnittansicht längs der Linie 2-2 in Figur 1;Figure 2 is a sectional view taken along the line 2-2 in Figure 1;
Figur 3: eine Seitenansicht eines Motorgehäuses des Elektromotors der Motorpumpeneinheit aus Figur 1 undFigure 3 is a side view of a motor housing of the electric motor of the motor pump unit of Figure 1 and
Figur 4: eine perspektivische Darstellung des Motorgehäuses aus Figur 3. In Figur 1 ist schematisch eine erfindungsgemäße Motorpumpeneinheit 10 dargestellt mit einem flüssigkeitsgekühlten Elektromotor 11, der als Asynchronmotor ausgebildet ist, und mit einer Pumpe 12, die vom Elektromotor 11 angetrieben wird. Der Elektromotor 11 weist in üblicher Weise einen Rotor 14 auf, der von einem Stator 15 umgeben ist. Der Stator 15 umfasst Statorwicklungen 16, die an Statorblechen 17 gehalten sind und der Pumpe 12 zugewandte vordere Wicklungsköpfe 18 und der Pumpe 12 abgewandte hintere Wicklungsköpfe 19 ausbilden.FIG. 4 shows a perspective illustration of the motor housing from FIG. 3. 1 shows schematically a motor pump unit 10 according to the invention with a liquid-cooled electric motor 11, which is designed as an asynchronous motor, and with a pump 12, which is driven by the electric motor 11. The electric motor 11 has in the usual way a rotor 14 which is surrounded by a stator 15. The stator 15 comprises stator windings 16, which are held on stator plates 17 and form the pump 12 facing front winding heads 18 and the pump 12 facing away from the rear winding heads 19.
Der Elektromotor 11 weist ein topfförmiges Motorgehäuse 22 auf, das durch Tiefziehen aus einem Blech geformt ist. Es umfasst einen zylindrischen Mantel 23 und einen Boden 24. In den Boden 24 ist zentrisch eine Aufnahme 26 eingeformt, die ein erstes Lager 27 einer Motorwelle 29 aufnimmt. Ein zweites Lager 31 der Motorwelle 29 ist an einem Lagerschild 33 gehalten, das an ein Antriebsgehäuse 35 der Pumpe 12 angeformt ist.The electric motor 11 has a cup-shaped motor housing 22 which is formed by deep drawing of a sheet metal. It comprises a cylindrical shell 23 and a bottom 24. In the bottom 24, a receptacle 26 is formed centrally, which receives a first bearing 27 of a motor shaft 29. A second bearing 31 of the motor shaft 29 is held on a bearing plate 33 which is integrally formed on a drive housing 35 of the pump 12.
Mit einem vorderen Mantelabschnitt 37 liegt der Mantel 23 des Motorgehäuses 22 unmittelbar an den Statorblechen 17 an, und in einem hinteren Mantelabschnitt 38 umgibt das Motorgehäuse 22 in radialem Abstand die hinteren Wicklungsköpfe 19 des Stators 15. In diesem Bereich weist das Motorgehäuse 22 in Umfangsrichtung in gleichmäßigem Abstand zueinander angeordnet eine Vielzahl steifigkeitserhöhender Vertiefungen in Form von Längssicken 40 auf. Die Längssicken 40 erstrecken sich in der der Pumpe abgewandten Richtung bis zu einem bogenförmigen Übergangsbereich 42, an den sich ein konzen- trisch zur Motorwelle 29 ausgerichteter Kragen 44 anschließt. Dieser bildet eine motorseitige zylindermantelförmige hintere Dichtfläche 45 aus, an der ein hinterer Dichtring 46 anliegt. An die motorseitige hintere Dichtfläche 45 schließt sich der Boden 24 an. Dieser weist in einem die zentrale Aufnahme 26 umgebenden ringförmigen Bodenabschnitt 48 eine Vielzahl radial verlaufender Rillen 49 auf, die die Steifigkeit des Bodens 24 des Motorgehäuses 22 erhöhen.With a front shell portion 37 of the jacket 23 of the motor housing 22 is located directly on the stator lugs 17, and in a rear shell portion 38 surrounds the motor housing 22 at a radial distance the rear winding heads 19 of the stator 15. In this area, the motor housing 22 in the circumferential direction in uniformly spaced from each other a plurality of stiffness-enhancing depressions in the form of longitudinal beads 40 on. The longitudinal beads 40 extend in the direction away from the pump as far as an arcuate transition region 42, to which a collar 44 aligned concentrically with the motor shaft 29 adjoins. This forms an engine-side cylinder jacket-shaped rear sealing surface 45, against which a rear sealing ring 46 abuts. To the engine-side rear sealing surface 45th joins the bottom 24. This has in a central receptacle 26 surrounding the annular bottom portion 48 a plurality of radially extending grooves 49 which increase the rigidity of the bottom 24 of the motor housing 22.
An seiner der Pumpe 12 zugewandten Stirnseite bildet das Motorgehäuse 22 einen nach außen abstehenden Ringflansch 51, an den sich der Pumpe 12 abgewandt eine motorseitige zylindermantelförmige vordere Dichtfläche 52 anschließt, an der ein vorderer Dichtring 53 anliegt.At its end facing the pump 12, the motor housing 22 forms an outwardly projecting annular flange 51, to which the pump 12 facing away from an engine-side cylinder jacket-shaped front sealing surface 52 connects, on which a front sealing ring 53 abuts.
Das Motorgehäuse 22 ist in Umfangsrichtung von einem aus Kunststoff gefertigten Kühlgehäuse 55 umgeben, das zylindermantelförmig ausgebildet und in axialer Richtung auf das Motorgehäuse 22 aufgeschoben ist. Ein konzentrisch zum Kragen 44 ausgerichteter Ansatz 57 des Kühlgehäuses 55 dedefiniert eine mit der hinteren Dichtfläche 45 des Motorgehäuses 22 korrespondierende hintere Dichtfläche 58 des Kühlgehäuses 55. Zwischen den hinteren Dichtflächen 45 und 58 ist der hintere Dichtring 46 radial verspannt. Eine zylindermantelförmige vordere Dichtfläche 59 des Kühlgehäuses 55 umgibt die vordere Dichtfläche 52 des Motorgehäuses 22. Zwischen den vorderen Dicht- flächen 52 und 59 ist der vordere Dichtring 53 radial verspannt. Im Bereich zwischen dem hinteren Dichtring 46 und dem vorderen Dichtring 53 erstreckt sich ein das Motorgehäuse 22 in Umfangsrichtung umgebender Ringraum 60, dem über einen Ringraumeinlass 61 Flüssigkeit zugeführt werden kann und aus dem die Flüssigkeit über einen Ringraumauslass 62 herausströmen kann. Stromaufwärts des Ringraumeinlasses 61 ist ein erster Kühlkanal 64 des Antriebsgehäuses 35 angeordnet, und stromabwärts schließt sich an den Ringraumauslass 62 ein zweiter Kühlkanal 65 des Antriebsgehäuses 35 an.The motor housing 22 is surrounded in the circumferential direction by a cooling housing 55 made of plastic, which is formed in a cylinder jacket and pushed onto the motor housing 22 in the axial direction. A concentric with the collar 44 aligned approach 57 of the cooling housing 55 dedefiniert a corresponding with the rear sealing surface 45 of the motor housing 22 rear sealing surface 58 of the cooling housing 55. Between the rear sealing surfaces 45 and 58, the rear sealing ring 46 is radially clamped. A cylinder jacket-shaped front sealing surface 59 of the cooling housing 55 surrounds the front sealing surface 52 of the motor housing 22. Between the front sealing surfaces 52 and 59, the front sealing ring 53 is radially braced. In the area between the rear sealing ring 46 and the front sealing ring 53, an annular space 60 surrounding the motor housing 22 extends in the circumferential direction, to which liquid can be supplied via an annular space inlet 61 and from which the liquid can flow out via an annular space outlet 62. Upstream of the annular space inlet 61, a first cooling channel 64 of the drive housing 35 is arranged, and downstream of the annular space outlet 62, a second cooling channel 65 of the drive housing 35 connects.
Die beiden Kühlkanäle 64 und 65 sind jeweils über eine Wärmeleitrippe 66 mit einem Grundkörper 68 des Antriebsgehäuses 35 einstückig verbunden. Dadurch wird eine besonders gute Wärmeleitung vom Grundkörper 68 zu den Kühlkanälen 64, 65 erreicht.The two cooling channels 64 and 65 are each connected in one piece via a heat-conducting rib 66 to a base body 68 of the drive housing 35. As a result, a particularly good heat conduction from the base body 68 to the cooling channels 64, 65 is achieved.
Der Grundkörper 68 umgibt einen an der Motorwelle 29 gehaltenen Taumeltrieb 70 mit einer Taumelscheibe 71. Außerdem umgibt der Grundkörper 68 an der Taumelscheibe 71 stirnseitig anliegende Kolben 73 der Pumpe 12. In der Zeichnung sind die Kolben 73 zur Verdeutlichung im Abstand zur Taumelscheibe 71 angeordnet. Tatsächlich liegen sie aber an der Taumelscheibe 71 an und werden von dieser zu einer hin- und hergehenden Bewegung angetrieben. Mit ihren der Taumelscheibe 71 abgewandten Enden tauchen die Kolben 73 in üblicher Weise jeweils in einen Pumpraum ein, so dass aufgrund der hin- und hergehenden Bewegung der Kolben Flüssigkeit von einem Saugeinlass 75 der Pumpe 12 in den Pumpraum eingesaugt und nach einem Verdichtungshub der Kolben 73 über einen Druckauslass 76 der Pumpe 12 ausgegeben werden kann.The main body 68 surrounds a wobble drive 70 held on the motor shaft 29 with a swashplate 71. In addition, the main body 68 surrounds the piston 73 of the pump 12 abutting the swashplate 71 on the front side. In the drawing, the pistons 73 are arranged at a distance from the swashplate 71 for clarity. In fact, they abut against the swash plate 71 and are driven by this to a reciprocating motion. With their ends facing away from the swash plate 71, the pistons 73 dive into a pumping space in the usual way, so that due to the reciprocating motion of the pistons, liquid is sucked into the pump chamber from a suction inlet 75 of the pump 12 and after a compression stroke of the pistons 73 can be output via a pressure outlet 76 of the pump 12.
Der Saugeinlass 75 ist über eine Verbindungsleitung 78 einer Leitungsanordnung 80 mit dem zweiten Kühlkanal 65 des Antriebsgehäuses 35 verbunden. Zusätzlich zur Verbindungsleitung 78 weist die Leitungsanordnung 80 noch eine Zuleitung 82 auf, der über einen Rohrstutzen 84 Flüssigkeit zugeführt werden kann. Die von der Pumpe 12 unter Druck zu setzende Flüssigkeit durchströmt zunächst den Rohrstutzen 84 und die Zuleitung 82 sowie den ersten Kühlkanal 64, tritt dann über den Ringraumeinlass 61 in den Ringraum 60 ein, umströmt innerhalb des Ringraums 60 das Motorgehäuse 22 und tritt über den Ringraumauslass 62 in den zweiten Kühlkanal 65 ein. Von diesem wird die Flüssigkeit über die Verbindungsleitung 78 dem Saugeinlass 75 zugeführt, so dass sie anschließend von der Pumpe 12 unter Druck gesetzt werden kann.The suction inlet 75 is connected via a connecting line 78 of a line arrangement 80 with the second cooling channel 65 of the drive housing 35. In addition to the connecting line 78, the line arrangement 80 also has a feed line 82, which can be supplied with liquid via a pipe stub 84. The liquid to be pressurized by the pump 12 first flows through the pipe socket 84 and the supply line 82 and the first cooling channel 64, then enters via the annular space inlet 61 in the annular space 60, flows around the motor housing 22 within the annular space 60 and enters the second cooling channel 65 via the annular space outlet 62. From this, the liquid is supplied via the connecting line 78 to the suction inlet 75, so that it can then be pressurized by the pump 12.
Die flüssigkeitsdichte Verbindung zwischen dem Ringraumeinlass 61 und dem ersten Kühlkanal 64 erfolgt über einen parallel zum ersten Kühlkanal 64 ausgerichteten und am Ringraumeinlass 61 angeformten Anschlussnippel 69, der beim Aufschieben des Kühlgehäuses 55 auf das Motorgehäuse 22 in den ersten Kühlkanal 64 eintaucht und der von einem Dichtring 72 umgeben ist. In entsprechender Weise erfolgt die flüssigkeitsdichte Verbindung zwischen dem Ringraumauslass 62 und dem zweiten Kühlkanal 65 mittels eines an den Ringraumauslass 62 angeformten Anschlussnippels 74, der in den zweiten Kühlkanal 65 eintaucht und von einem Dichtring 77 umgeben ist.The liquid-tight connection between the annular space inlet 61 and the first cooling channel 64 via a parallel to the first cooling channel 64 aligned and integrally formed on the annular space 61 connecting nipple 69, which dips when sliding the cooling housing 55 on the motor housing 22 in the first cooling channel 64 and that of a sealing ring 72 is surrounded. In a corresponding manner, the liquid-tight connection between the annular space outlet 62 and the second cooling channel 65 takes place by means of a connecting nipple 74 formed on the annular space outlet 62, which dips into the second cooling channel 65 and is surrounded by a sealing ring 77.
Die die Kühlkanäle 64 und 65 sowie den Ringraum 60 durchströmende Flüs- sigkeit nimmt Abwärme des Antriebsgehäuses 35 und des Motorgehäuses 22 auf. Das Antriebsgehäuse 35 und das Motorgehäuse 22 werden somit wirksam gekühlt.The liquid flowing through the cooling channels 64 and 65 and the annular space 60 absorbs waste heat from the drive housing 35 and from the motor housing 22. The drive housing 35 and the motor housing 22 are thus effectively cooled.
Der Rohrstutzen 84 wird in vielen Fällen an ein unter Druck stehendes Was- serversorgungsnetz angeschlossen. Dies hat zur Folge, dass die in den Ringraum 60 einströmende Flüssigkeit bereits unter einem Druck von einigen bar, beispielsweise unter einem Druck von 3 bis 10 bar, steht. Der praktisch über seine gesamte Länge vom Ringraum 60 umgebene Mantel 23 des Motorgehäuses 22 unterliegt daher einer nicht unbeachtlichen Druckbelastung. Im Bereich des vorderen Mantelabschnitts 37 liegt der Mantel 23 unmittelbar an den Statorblechen 17 an und wird von diesen zuverlässig abgestützt. Im Bereich der hinteren Wicklungsköpfe 19 erfährt der Mantel 23 jedoch keine derartigeThe pipe socket 84 is in many cases connected to a pressurized water supply network. This has the consequence that the liquid flowing into the annular space 60 is already under a pressure of a few bar, for example under a pressure of 3 to 10 bar. The practically over his entire length surrounded by the annular space 60 jacket 23 of the motor housing 22 is therefore subject to a not inconsiderable pressure load. In the area of the front jacket section 37, the jacket 23 abuts directly against the stator laminations 17 and is reliably supported by them. However, in the area of the rear winding heads 19, the jacket 23 does not undergo such a change
Abstützung. Deshalb sind im hinteren Mantelabschnitt 38 die steifigkeitserhö- henden Längssicken 40 in das Motorgehäuse 22 eingeformt. Es hat sich gezeigt, dass dadurch das Motorgehäuse 22 auch bei längerem Einsatz der Motorpumpeneinheit 10 zuverlässig einer Druckbelastung, wie sie üblicher- weise in öffentlichen Wasserversorgungsnetzen vorliegt, standhalten kann. Der Ringraum 60 kann sich daher über die gesamte Länge des Mantels 23 des Motorgehäuses 22 erstrecken und nicht etwa nur über den vorderen Mantelabschnitt 37, der durch die Statorbleche 17 eine Abstützung erfährt. Der somit vergrößerte Ringraum 60 führt zu einer besonders wirkungsvollen Kühlung des Elektromotors 11. Da außerdem auch das Antriebsgehäuse 35 und über dieses insbesondere das Lagerschild 33 und der Taumeltrieb 70 von der zu fördernden Flüssigkeit gekühlt werden, zeichnet sich die erfindungsgemäße Motorpumpeneinheit 10 durch eine besonders wirkungsvolle Kühlung aus. Selbst wenn die Motorpumpeneinheit 10 von einem Gehäuse ohne Zuluft- und Abluft- Öffnungen umgeben ist, besteht keine Gefahr einer Überhitzung. Die Motorpumpeneinheit 10 eignet sich daher in besonderer Weise für den Einsatz in spritzwassergeschützten Gehäusen von Hochdruckreinigungsgeräten. Support. Therefore, the stiffness-increasing longitudinal beads 40 are formed in the motor housing 22 in the rear jacket section 38. It has been found that, as a result of this, the motor housing 22 can reliably withstand a pressure load, such as is usually present in public water supply networks, even with prolonged use of the motor pump unit 10. The annular space 60 can therefore extend over the entire length of the jacket 23 of the motor housing 22 and not just about the front jacket portion 37, which undergoes a support by the stator laminations 17. The thus enlarged annular space 60 leads to a particularly effective cooling of the electric motor 11. In addition, since the drive housing 35 and this particular the bearing plate 33 and the wobble drive 70 are cooled by the liquid to be conveyed, the motor pump unit 10 according to the invention is characterized by a particularly effective Cooling off. Even if the motor pump unit 10 is surrounded by a housing without Zuluft- and exhaust openings, there is no risk of overheating. The motor pump unit 10 is therefore particularly suitable for use in splash-proof housings of high-pressure cleaning devices.

Claims

PATENTANSPRÜCHE
1. Motorpumpeneinheit für ein Hochdruckreinigungsgerät mit einem flüssig- keitsgekühlten Elektromotor und einer Pumpe, wobei der Elektromotor ein topfförmiges Motorgehäuse aufweist, das unter Ausbildung eines Ringraums mit einem Ringraumeinlass und einem Ringraumauslass von einem Kühlgehäuse umgeben ist, und wobei die Pumpe einen mit dem Ringraumauslass verbundenen Saugeinlass zum Ansaugen von Flüssigkeit und einen Druckauslass zum Abgeben von Flüssigkeit aufweist und wobei die von der Pumpe zu fördernde Flüssigkeit dem Ringraumeinlass zuführ- bar ist, dadurch gekennzeichnet, dass das Motorgehäuse (22) als einteiliges Tiefziehteil ausgestaltet ist, das in einem vorderen Mantelbereich (37) an Statorblechen (17) des Elektromotors (11) anliegt und in einem hinteren Mantelbereich (38) im Abstand zu hinteren Wicklungsköpfen (19) des Stators (15) angeordnet ist und im hinteren Mantelbereich (38) steifigkeitserhöhende Vertiefungen (40) aufweist, wobei der vordere und der hintere Mantelbereich (37, 38) vom Ringraum (60) umgeben sind.A motor pump unit for a high pressure cleaner having a liquid cooled electric motor and a pump, the electric motor having a cup-shaped motor housing surrounded by an annulus forming an annulus inlet and an annulus outlet from a cooling casing, and wherein the pump is connected to the annulus outlet Suction inlet for sucking in liquid and a pressure outlet for dispensing liquid, and wherein the liquid to be delivered by the pump can be fed to the annular space inlet, characterized in that the motor housing (22) is designed as a one-piece deep-drawn part which is located in a front jacket region ( 37) bears against stator laminations (17) of the electric motor (11) and is arranged in a rear jacket region (38) at a distance from rear winding heads (19) of the stator (15) and has stiffness-increasing depressions (40) in the rear jacket region (38), with the front and the back Re mantle region (37, 38) from the annular space (60) are surrounded.
2. Motorpumpeneinheit nach Anspruch 1, dadurch gekennzeichnet, dass die steifigkeitserhöhenden Vertiefungen als in Längsrichtung des Elektromo- tors (11) ausgerichtete Sicken (40) ausgestaltet sind.2. Motor pump unit according to claim 1, characterized in that the stiffness-increasing depressions as in the longitudinal direction of the electric motor (11) aligned beads (40) are configured.
3. Motorpumpeneinheit nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Motorgehäuse (22) auf der der Pumpe (12) abgewandten Seite der Vertiefungen (40) einen konzentrisch zu einer Motorwelle (29) aus- gerichteten Kragen (44) aufweist, der eine Dichtfläche (45) für einen3. Motor pump unit according to claim 1 or 2, characterized in that the motor housing (22) on the side facing away from the pump (12) of the recesses (40) has a concentric with a motor shaft (29) aligned collar (44), the a sealing surface (45) for a
Dichtring (46) ausbildet. Forms sealing ring (46).
4. Motorpumpeneinheit nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass das Kühlgehäuse (55) als zylindermantelförmiges Kunststoffteil ausgestaltet ist, das in axialer Richtung auf das Motorgehäuse (22) aufschiebbar ist und das in einem der Pumpe zugewandten vorderen Bereich und einem der Pumpe abgewandten hinteren Bereich konzentrisch zur Motorwelle (29) ausgerichtete Dichtflächen (52, 58) aufweist, an denen jeweils ein in radialer Richtung verspannter Dichtring (53, 46) zur Abdichtung des Ringraums (60) anliegt.4. Motor pump unit according to one of the preceding claims, characterized in that the cooling housing (55) is designed as a cylinder jacket-shaped plastic part which in the axial direction on the motor housing (22) can be pushed and facing away from the pump in a front region and one of the pump has rearwardly concentric with the motor shaft (29) aligned sealing surfaces (52, 58), against which in each case a strained in the radial direction sealing ring (53, 46) for sealing the annular space (60).
5. Motorpumpeneinheit nach Anspruch 4, dadurch gekennzeichnet, dass das Kühlgehäuse (55) in seinem der Pumpe (12) abgewandten Endbereich einen ringförmigen Ansatz (57) aufweist, der eine zylindermantelförmige Dichtfläche (58) definiert zur Anlage eines Dichtrings (46).5. Motor pump unit according to claim 4, characterized in that the cooling housing (55) in its pump (12) facing away from the end portion has an annular projection (57) which defines a cylinder jacket-shaped sealing surface (58) for abutment of a sealing ring (46).
6. Motorpumpeneinheit nach Anspruch 5, dadurch gekennzeichnet, dass die Dichtfläche (58) des Ansatzes (57) in radialer Richtung auf gleicher Höhe wie der Boden der Vertiefungen (40) angeordnet ist.6. Motor pump unit according to claim 5, characterized in that the sealing surface (58) of the projection (57) in the radial direction at the same height as the bottom of the recesses (40) is arranged.
7. Motorpumpeneinheit nach Anspruch 4, 5 oder 6, dadurch gekennzeich- net, dass am Ringraumeinlass (61) und/oder am Ringraumauslass (62) ein parallel zur Motorwelle (29) ausgerichteter Anschlussnippel (69, 74) angeordnet ist, der beim Aufschieben des Kühlgehäuses (55) auf das Motorgehäuse (22) flüssigkeitsdicht mit einem Kühlkanal (64, 65) eines Antriebsgehäuses (35) der Pumpe (12) verbindbar ist. 7. Motor pump unit according to claim 4, 5 or 6, characterized marked, that at the annular space inlet (61) and / or at the annular space outlet (62) a parallel to the motor shaft (29) aligned connection nipple (69, 74) is arranged, which when pushed the cooling housing (55) on the motor housing (22) liquid-tight with a cooling channel (64, 65) of a drive housing (35) of the pump (12) is connectable.
EP10702858A 2009-02-13 2010-01-29 Motor pump unit Withdrawn EP2396546A1 (en)

Applications Claiming Priority (2)

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DE102009010461A DE102009010461A1 (en) 2009-02-13 2009-02-13 Motor pump unit
PCT/EP2010/051100 WO2010091965A1 (en) 2009-02-13 2010-01-29 Motor pump unit

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EP2396546A1 true EP2396546A1 (en) 2011-12-21

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EP (1) EP2396546A1 (en)
JP (1) JP5502904B2 (en)
CN (1) CN102292544B (en)
DE (1) DE102009010461A1 (en)
WO (1) WO2010091965A1 (en)

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WO2010091965A1 (en) 2010-08-19
US9046087B2 (en) 2015-06-02
DE102009010461A1 (en) 2010-08-19
CN102292544B (en) 2016-07-20
CN102292544A (en) 2011-12-21
US20120034111A1 (en) 2012-02-09
JP5502904B2 (en) 2014-05-28
JP2012518111A (en) 2012-08-09

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