EP0873199A1 - Hochdruckreinigungsgerät - Google Patents
HochdruckreinigungsgerätInfo
- Publication number
- EP0873199A1 EP0873199A1 EP95943185A EP95943185A EP0873199A1 EP 0873199 A1 EP0873199 A1 EP 0873199A1 EP 95943185 A EP95943185 A EP 95943185A EP 95943185 A EP95943185 A EP 95943185A EP 0873199 A1 EP0873199 A1 EP 0873199A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric motor
- housing
- pressure cleaning
- cleaning device
- motor
- 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.)
- Granted
Links
Classifications
-
- 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
- B08B3/028—Spray guns
-
- 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
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
- B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
- B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
Definitions
- the invention relates to a high-pressure cleaning device with a piston pump which is driven by an air-cooled electric motor via a gear and comprises a swash plate and onto which a pump head with a suction connection and a pressure connection is placed.
- Such high-pressure cleaning devices can be supplied with a cleaning liquid, for example water, via the suction connection.
- the cleaning fluid is pressurized by the piston pump and can be delivered via the pressure connection, for example, to a pressure line connected to it.
- Pistons which can be moved back and forth are usually provided in the piston pump and bear against the swash plate. This is set in rotation by the electric motor, a gear being used that transmits the rotary movement from a motor shaft of the electric motor to the swash plate. Air cooling is used to prevent the electric motor from overheating.
- the cleaning effect of such high-pressure cleaning devices is dependent on the achievable pressure (for example 90 bar) and on the volume of the cleaning liquid dispensed per unit of time, i.e. depending on the flow rate.
- the pump In order to be able to achieve a high pressure and a large demand, the pump must be equipped with a correspondingly powerful electric motor. However, due to the associated size of the electric motor, this results in a considerable weight and an unsatisfactory handling of the high-pressure cleaning device.
- the object of the present invention is to develop a generic high-pressure cleaning device so that a good cleaning effect with improved handling and reduced weight can be achieved.
- a high-pressure cleaning device of the type mentioned in the introduction in that the electric motor, the transmission, the piston pump and the pump head are arranged one behind the other in the longitudinal direction of the high-pressure cleaning device and in that the electric motor is designed as a universal motor with a stator package and a rotor, the length of the stator packet being greater than the diameter of the rotor.
- a universal motor with a relatively long stator package is used as the air-cooled electric motor, this results in particularly effective air cooling of the electric motor.
- a ventilation unit is usually used for air cooling, which generates an air flow in the longitudinal direction of the electric motor.
- the expansion of the corresponding cooling surfaces of the electric motor in the longitudinal direction is decisive for good heat dissipation. If a relatively long motor is used, ie a motor with a stator package whose length is greater than the diameter of the rotor, a longer cooling surface is effective in comparison with relatively short motors, which ensures better cooling.
- the air cooling of the electric motor can at the same time bring about good heat dissipation from the remaining parts of the high-pressure cleaning device due to the longitudinal air flow. It has been found that by means of the configuration according to the invention, the heating of the electric motor is kept relatively low even in continuous operation; this has the consequence that the electric motor can be heavily loaded even in continuous operation without causing overheating. Due to the effective cooling can Compared to known high-pressure cleaning devices, an electric motor with a lower nominal power can be used, which can be operated at maximum power in order to achieve the same cleaning effect as comparable high-pressure cleaning devices with electric motors with a higher nominal power but less load capacity. Since the weight of the motor represents a significant proportion of the total weight of the high-pressure cleaning device, the use of a smaller electric motor leads to a considerable reduction in the total weight. This in turn results in better manageability of the high-pressure cleaning device.
- stator packet length is at least 1.15 times the rotor diameter, because such a longitudinal expansion of the stator results in a particularly large effective cooling surface.
- a particularly effective cooling of the electric motor is achieved in that a radial fan is used as the ventilation unit, which is positioned between the electric motor and the transmission and which forms an air flow from the motor in the direction of the pump head of the high-pressure cleaning device.
- a radial fan has the advantage that, in contrast to the usual axial fans, it can also work against an existing air pressure without reducing its speed.
- the radial fan sucks in the cooling air from the electric motor and presses it along the components which adjoin the electric motor in the longitudinal direction of the high-pressure cleaning device. As a result, the cooling air first comes into contact with the electric motor.
- the cooling air is then pressed by the radial fan along the gear and along the piston pump in the direction of the pump head, where further heat dissipation takes place.
- the high-pressure cleaning device provides for the air flow along the outside of the electric motor in the direction of a collector arranged on the end of the electric motor opposite the radial fan and from there through the electric motor in the direction of the radial fan includes guide element.
- the cooling air is thus first guided along the outside of the electric motor, the collector reverses flow, and the cooling air enters the electric motor, flows through it to the radial fan and then towards the pump head of the high-pressure cleaning device. Due to the extensive contact of the cooling air with the electric motor, this results in particularly good heat dissipation.
- the collector of the electric motor which is exposed to particularly strong heating during continuous operation, is completely surrounded by the cooling air.
- the electric motor can therefore also be subjected to very high loads in continuous operation, i.e. it can be operated practically continuously at maximum output without overheating.
- the guide element is designed as a motor housing which receives the electric motor and which forms a flow channel which leads along the outside of the electric motor and which establishes a connection between an opening of the electric motor which is arranged approximately at the level of the end of the electric motor facing away from the collector Motor housing and the collector.
- the motor housing is designed in such a way that it not only ensures protection of the electric motor, but also additionally guides the cooling air along the electric motor and thereby enables good cooling.
- the motor housing forms a flow channel on the outside of the electric motor and has an opening on the end of the electric motor facing away from the collector, which opening is connected to the collector via the flow channel. The cooling air can enter the flow channel of the motor housing via the opening, then it is guided along the outside of the electric motor until it hits the collector, where it enters the electric motor and flows through it to the radial fan.
- the motor housing is pot-shaped with a bottom wall and a side wall protruding therefrom and that a gear housing is immersed in the motor housing, the electric motor and the gear housing being held at a distance from the inside of the side wall of the motor housing and wherein an opening of the transmission housing is sealed by the electromotor.
- the radial fan connecting the electric motor in the longitudinal direction of the high-pressure cleaning device and the gear mechanism are arranged in a gear housing, which is immersed in the pot-shaped motor housing and the opening arranged inside the motor housing is sealed by the electric motor.
- the area of the gear housing which dips into the motor housing and the electric motor are kept at a distance from the inside of the side wall of the motor housing, so that the cooling air enters the motor housing between the gear housing and the side wall of the motor housing and on the outside of the electric motor can flow down to the bottom wall. There, the cooling air enters the electric motor and flows through it to the radial fan and from there inside the gear housing along the gear.
- Motor and gearbox housings can each be substantially cylindrical, the diameter of the motor housing exceeding the diameter of the gearbox housing, so that an annular gap is formed between the gearbox housing which is immersed in the motor housing and the motor housing. It is advantageous if an air-permeable, dust and splash water impermeable sealing element, for example made of plastic, is arranged in this annular gap.
- the motor housing and / or the gear housing are made of plastic.
- Polypropylene for example, can be used as the plastic material.
- the use of plastic not only results in a weight saving, but also the manufacturing costs are considerably reduced in comparison to the usual metal housings.
- the high-pressure cleaning device comprises a housing shell surrounding the electric motor, the radial fan, the gearbox, the piston pump and the pump head, which is formed from two half-shells which are essentially mirror-symmetrical to one another, in each case in Height of the pump head and the gear housing ventilation slots are formed.
- the two-shell design of the housing shell enables a particularly simple assembly of the high-pressure cleaning device. For this purpose, only the functional parts have to be inserted into one of the two half shells, then the other half shell is put on and screwed to the first half shell, for example.
- the half-shells can be bound holding elements can be provided, in which the functional parts can be clamped.
- the housing shell is preferably made of plastic, for example of polypropylene. Cooling air can enter the housing shell via the ventilation slots arranged approximately centrally in the longitudinal direction of the high-pressure cleaning device and is sucked into the motor housing by the radial fan.
- the ventilation slots can be formed, for example, in a labyrinthine manner, in that a cover covering the ventilation slots is provided at a distance from the inside of the housing shell.
- a particularly good cooling of the electric motor is achieved in that the housing shell has an opening in the area of the bottom and side walls of the motor housing.
- the electric motor is therefore not only cooled by the cooling air drawn in by the radial fan, but also by the ambient air, which comes into direct contact with the motor housing in the region of the bottom and side walls and cools it.
- cooling surface of the motor housing is increased in this area by cooling fins being arranged in the region of the opening of the housing shell on the outside of the bottom and side walls of the motor housing.
- Figure 1 is a side view of an inventive
- Figure 2 is a schematic longitudinal sectional view of the
- Figure 3 is a sectional view of the housing shell of the
- Figure 4 is a sectional view of the housing shell along the line 4-4 in Figure 1.
- a high-pressure cleaning device 10 is shown with a suction connection 11, a pressure connection 12 and a chemical connection 13.
- Cleaning suction can be supplied to the high-pressure cleaning device 10 via the suction connection 11, which liquid is then dispensed via the pressure connection 12 under high pressure.
- a cleaning chemical can be admixed to the cleaning liquid via the chemical connection 13, so that the cleaning effect is increased.
- the high-pressure cleaning device 10 comprises an electric motor 14, on the end of which faces the pressure connection 12, a radial fan 16 is placed, to which a gear 18 and a piston pump 20 are connected.
- the piston pump 20 comprises a swash plate 24 against which a plurality of pistons 26 abut, which are moved back and forth in the longitudinal direction of the high-pressure cleaning device 10 by the rotary movement of the swash plate 24.
- the pistons 26 immerse in a pump chamber 28 of a pump head 30, which connects to the piston pump 20 in the longitudinal direction of the high-pressure cleaning device 10.
- the pump chamber 28 stands Via a suction valve 32 with a suction line 34, in which a suction nozzle 36 opens, on which the suction connection 11 is arranged at the end.
- the pump chamber 28 is connected via a pressure valve 36 to a pressure line 38, in which a check valve 40 and an injector 42 are arranged one behind the other and which opens into a pressure nozzle 44, on which the pressure connection 12 is arranged.
- the injector 42 is connected via a transverse bore, not shown in the drawing, to a suction chamber 46, into which the chemical connection 13 opens.
- the cleaning liquid is pumped via the suction line 34 and the suction valve 32 into the pump chamber 28, pressurized there and released to the pressure connection 12 via the pressure valve 36 and the pressure line 38.
- the cleaning liquid can be admixed with a cleaning chemical that is drawn by the injector 42 out of the suction chamber 46, which is connected to the chemical connection 13.
- the electric motor 14 is designed as a universal motor and comprises an armature winding 48 and a stator package 50 as well as a collector 52 arranged on the end of the electric motor 14 opposite the radial fan 16.
- the electric motor 14 is in an essentially cylindrical motor housing 54 with an essentially as Cylinder jacket designed side wall 56 and a bottom wall 58 at a distance from the inside 57 of the side wall 56.
- the mounting is carried out by means of housing ribs 60 projecting radially inwards from the side wall 56 and running in the longitudinal direction of the high-pressure cleaning device 10.
- a cylinder-shaped gear housing 62 which accommodates both the gear 18 and the piston pump 20, dips into the motor housing 54, the outer diameter of which is smaller than the inner diameter of the motor housing 54, so that an annular gap 64 is formed between the inside 57 of the side wall 56 of the motor housing 54 and the gear housing 62, in which a splash water seal 66 is arranged.
- This is formed by a sponge-like, porous plastic, through which air can flow, but which is impermeable to water spray.
- Another spray water seal 68 is positioned between the piston pump 20 and the pump head 30.
- the gear housing 62 has a collar 70 at its end which dips into the motor housing 54, on the inside of which the electric motor 14 lies sealingly. Cooling air can therefore only get from the motor housing 54 into the gear housing 62 by flowing through the electric motor 14.
- the radial fan 16 which is held in a rotationally fixed manner on a motor shaft 22, is set in rotation so that it sucks in cooling air from the area of the electric motor 14 and presses it in the direction of the pump head 30.
- the sucked-in cooling air can enter the interior of the motor housing 54 via the annular gap 64, it then flows along the outside of the electric motor 14 in the direction of the collector 52, enters the interior of the electric motor 14 there and flows through the stator pack 50 through to the radial fan 16 and then through the gear housing.
- the cooling air emerges from the gear housing 62 via the splash water seal 68 and then flows around the outside of the pump head 30.
- the cooling air thus flows both along the outside of the electric motor 14 and through it, the electric motor 14 being particularly long is: With a rotor diameter of 39 mm, the length of the stator stack, ie the expansion of the stacked stator laminations in the longitudinal direction of the electric motor, is 45 mm. This results in a particularly effective cooling of the electric motor 14.
- the electric motor 14, the radial fan 16, the gear 18 and the piston pump 20 and the pump head 30 are surrounded by a housing shell 72 into which the gear housing 62 and the pump head 30 are located in the height Ventilation slots 74 are essentially formed in the longitudinal direction of the high-pressure cleaning device.
- the cooling air enters the housing shell via the ventilation slots 74 arranged at the level of the gear housing 62 and is then sucked into the motor housing 54 by the radial fan 16 and then pressed through the gear housing 62 and finally passes through the level of the Poir.pen - Head 30 arranged ventilation slots again from the housing shell 72. The direction of the air flow is shown in the drawing by the arrows 76.
- the housing shell 72 has an opening 78, so that the motor housing 54 has direct contact with the ambient air in this area; this is associated with an additional cooling effect.
- cooling ribs 80 are arranged in the region of the opening 78 on the outside of the motor housing.
- the ventilation slots 74 are labyrinth-like in that the openings of the ventilation slots 74 are covered by a cover 82 arranged at a distance from the inside of the housing shell 72. Due to such a design of the ventilation slots 74, practically no spray water can enter the housing shell 72.
- the housing shell 72 is formed by two half-shells designed to be mirror-symmetrical to one another, the mirror Live 88, as can be seen from Figure 4 of the drawing, runs in the longitudinal direction of the high-pressure cleaning device 10.
- a half-shell 84 is partially shown in FIG. 4. It is designed like a trough and has an upper edge 86 on which the second half-shell (not shown in the drawing) can be placed.
- Both the housing shell 72 and the motor housing 74 and the gear housing 62 are made of polypropylene.
- the electric motor 14 can practically be operated at maximum power, so that a relatively small electric motor can be used. As with the use of plastic for the housing shell 72 and the motor and gear housing 54 and 62, this results in a considerable reduction in weight and thus in better manageability of the high-pressure cleaning device 10.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Motor Or Generator Cooling System (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1995/005087 WO1997023308A1 (de) | 1995-12-22 | 1995-12-22 | Hochdruckreinigungsgerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0873199A1 true EP0873199A1 (de) | 1998-10-28 |
EP0873199B1 EP0873199B1 (de) | 2004-03-03 |
Family
ID=8166143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95943185A Expired - Lifetime EP0873199B1 (de) | 1995-12-22 | 1995-12-22 | Hochdruckreinigungsgerät |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0873199B1 (de) |
AU (1) | AU4433096A (de) |
DE (1) | DE59510870D1 (de) |
DK (1) | DK0873199T3 (de) |
WO (1) | WO1997023308A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009098035A1 (de) * | 2008-02-07 | 2009-08-13 | Alfred Kärcher Gmbh & Co. Kg | Hochdruckreinigungsgerät |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10340744B4 (de) * | 2003-08-29 | 2012-03-29 | Alfred Kärcher Gmbh & Co. Kg | Hochdruckreinigungsgerät |
WO2013123968A1 (de) * | 2012-02-20 | 2013-08-29 | Alfred Kärcher Gmbh & Co. Kg | Hochdruckreinigungsgerät |
DE102015117079A1 (de) * | 2015-10-07 | 2017-04-13 | Alfred Kärcher Gmbh & Co. Kg | Luftgekühltes Hochdruckreinigungsgerät |
EP3813500B1 (de) | 2019-10-24 | 2023-09-20 | Andreas Stihl AG & Co. KG | Lüftungsvorrichtung mit spritzwasserschutz und arbeitsgerät mit einer solchen lüftungsvorrichtung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5040950A (en) * | 1989-08-07 | 1991-08-20 | Northland Aluminum Products, Inc. | Power washing apparatus |
DE4106955A1 (de) * | 1991-03-05 | 1992-09-10 | Kaercher Gmbh & Co Alfred | Hochdruckreinigungsgeraet |
IT231077Y1 (it) * | 1993-12-22 | 1999-07-12 | Pavarini Srl | Idropulitrice. |
-
1995
- 1995-12-22 AU AU44330/96A patent/AU4433096A/en not_active Abandoned
- 1995-12-22 DE DE59510870T patent/DE59510870D1/de not_active Expired - Lifetime
- 1995-12-22 WO PCT/EP1995/005087 patent/WO1997023308A1/de active IP Right Grant
- 1995-12-22 EP EP95943185A patent/EP0873199B1/de not_active Expired - Lifetime
- 1995-12-22 DK DK95943185T patent/DK0873199T3/da active
Non-Patent Citations (1)
Title |
---|
See references of WO9723308A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009098035A1 (de) * | 2008-02-07 | 2009-08-13 | Alfred Kärcher Gmbh & Co. Kg | Hochdruckreinigungsgerät |
Also Published As
Publication number | Publication date |
---|---|
WO1997023308A1 (de) | 1997-07-03 |
AU4433096A (en) | 1997-07-17 |
DE59510870D1 (de) | 2004-04-08 |
DK0873199T3 (da) | 2004-03-29 |
EP0873199B1 (de) | 2004-03-03 |
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