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.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Details Of Reciprocating Pumps (AREA)
• Reciprocating Pumps (AREA)
• Motor Or Generator Cooling System (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=41824935

Family Applications (1)

Country Status (6)

Families Citing this family (22)

Family Cites Families (113)

• 2009
  • 2009-02-13 DE DE102009010461A patent/DE102009010461A1/de not_active Withdrawn
• 2010
  • 2010-01-29 WO PCT/EP2010/051100 patent/WO2010091965A1/de active Application Filing
  • 2010-01-29 EP EP10702858A patent/EP2396546A1/de not_active Withdrawn
  • 2010-01-29 JP JP2011549509A patent/JP5502904B2/ja not_active Expired - Fee Related
  • 2010-01-29 CN CN201080005493.8A patent/CN102292544B/zh not_active Expired - Fee Related
• 2011
  • 2011-08-04 US US13/136,668 patent/US9046087B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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