EP0764059A1 - Hochdruckreinigungsgerät mit sicherheitsisolierung - Google Patents
Hochdruckreinigungsgerät mit sicherheitsisolierungInfo
- Publication number
- EP0764059A1 EP0764059A1 EP94928358A EP94928358A EP0764059A1 EP 0764059 A1 EP0764059 A1 EP 0764059A1 EP 94928358 A EP94928358 A EP 94928358A EP 94928358 A EP94928358 A EP 94928358A EP 0764059 A1 EP0764059 A1 EP 0764059A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cleaning device
- pressure cleaning
- electrically insulating
- insulating plastic
- housing
- 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
- 238000004140 cleaning Methods 0.000 title claims abstract description 36
- 238000009413 insulation Methods 0.000 title description 2
- 239000012777 electrically insulating material Substances 0.000 claims abstract description 3
- 230000007704 transition Effects 0.000 claims abstract description 3
- 239000004033 plastic Substances 0.000 claims description 43
- 229920003023 plastic Polymers 0.000 claims description 43
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 239000006223 plastic coating Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
- F04B1/146—Swash plates; Actuating elements
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
Definitions
- the invention relates to a high-pressure cleaning device with an electric motor arranged in a housing, a high-pressure pump arranged in a housing with at least one piston sealingly entering a pump chamber and with a swash plate which is carried by a motor shaft emerging from the housing of the electric motor and on which the or the pistons of the high pressure pump rest resiliently.
- the motor shaft consists of an electrically insulating plastic.
- the motor shaft is coated with a coating of electrically insulating plastic at least in the area in which the swash plate bears against it.
- the motor shaft carries a cap made of electrically insulating plastic in the area in which the swash plate lies against it.
- the swash plate is held on the end face by a screw on the motor shaft, which rests on the swash plate with a head made of electrically insulating plastic material.
- a screw on the motor shaft rests on the swash plate with a head made of electrically insulating plastic material.
- the screw can be made of metal and its head can be surrounded by an electrically insulating coating. It is advantageous if the cover has attachment surfaces for a wrench on the outside. As a result, a screw provided in this way with a plastic coating can also be screwed in in the usual way.
- a metallic force transmission element is arranged on the screw, which is embedded in the plastic covering. It can be, for example, a washer that has a larger outer diameter than the head of the screw.
- the coating is sprayed onto the head of the screw, that is to say if the head and possibly also the force transmission element are injected together.
- the swash plate consists of an electrically insulating plastic.
- the swash plate receives a contact plate on which the piston or pistons lie and that the contact plate is made of electrically insulating plastic.
- metallic connections between the swash plate and the motor shaft can be used, and the motor shaft itself can also be metallic.
- a further possibility of an electrical separation arises if the pistons consist of electrically insulating plastic or are encased in an electrically insulating plastic.
- an intermediate layer made of electrically insulating plastic is arranged between the stator of the electric motor and the housing of the electric motor.
- An intermediate layer made of electrically insulating plastic can also be arranged between the stator of the electric motor and the housing of the pump.
- the intermediate layer is designed as a film.
- an intermediate layer made of electrically insulating plastic is arranged between the housings of the pump and the electric motor.
- This intermediate layer is preferably designed as a ring.
- This ring can carry lugs that lie between the attachment lugs of the housing of the pump and the electric motor. These approaches are also electrically isolated from one another. It is provided that the attachment lugs are connected to each other by a screw which consists of metal and is surrounded by a jacket made of electrically insulating plastic in such a way that the metallic part of the screw is electrically separated from at least one of the lugs. It is advantageous if the jacket is a plug-in sleeve into which the screw is inserted.
- the housing of the pump can be provided with a coating made of electrically insulating plastic or even made of electrically insulating plastic.
- a chamber for accommodating electrical lines and / or switching elements is attached to the housing of the pump and is electrically separated from the housing of the pump with the interposition of an electrically insulating plastic. In this way, complete electrical insulation of the pump and the pump housing is also achieved in the area of the electrical supply, so that a high-pressure cleaning device constructed in accordance with the above description corresponds to increased safety requirements.
- FIG. 1 shows a side view of a high-pressure cleaning device, shown partly broken away, with a motor pump unit cut in the longitudinal direction;
- Figure 2 is a longitudinal sectional view through the swash plate drive of the motor pump unit of Figures 1 and
- FIG. 3 an enlarged longitudinal sectional view in the connection area of the housing of the electric motor and the pump.
- a motor pump unit 2 which comprises an electric motor 3 and a high pressure pump 4, is arranged in a housing 1 of a high pressure cleaning device.
- the electric motor 3 is positioned in a pot-shaped housing 5, which has a central rotary bearing 7 for a motor shaft 8 on the bottom 6, which is part of a rotor 9. This is surrounded by a stator 10 with a stator winding 11.
- a film 12 made of an electrically insulating plastic material is inserted between the stator 10 and the housing 5 of the electric motor, so that the stator is completely insulated from the housing 5 of the electric motor.
- the hood 13 receives a rotary bearing 15 for the motor shaft 8, so that the motor shaft 8 is mounted between the bearings 7 and 15. It passes through the bottom of the hood 13 and protrudes into a swash plate chamber 16 inside the housing 14. There, the motor shaft 8 is connected to a swash plate 17, which serves as a drive for the high-pressure pump 4.
- This high-pressure pump 4 comprises a plurality of pumping chambers 18, only one of which is shown in FIG.
- This pump chamber 18 is connected via an inlet valve 19 to a suction line 20 and via an outlet valve 21 to a pressure line 22.
- a cylindrical piston 23 is immersed in the pump chamber 18 and is mounted displaceably in a guide 24 and which is pressed against an annular contact disk 27 by a helical spring 25 concentrically surrounding the guide and the piston, which is supported on the one hand on the pump chamber 18 and on the other hand on a support collar 26 of the piston 23.
- This is rotatably mounted in the swash plate via a ball bearing 28, so that when the motor shaft and the swash plate rotate, the pistons pressed against the contact plate 27 are oscillated in the guide.
- the motor shaft 8 In the region of the rotary bearing 15, the motor shaft 8 carries a cap 29 made of electrically insulating plastic which engages in the inner ring 30 of a ball bearing 31, which forms the rotary bearing 15. This prevents an electrical connection between the motor shaft 8 on the one hand and the rotary bearing 15 on the other hand and thus also an electrical connection between the motor shaft 8 on the one hand and the housing 14 of the high pressure pump on the other hand.
- the swash plate 17 surrounds the front end of the cap 29 with a central recess 32 and lies against a step 33 of this cap 29.
- the recess 32 and the foremost end of the cap 29 can be non-circular, so that the swash plate and the motor shaft are connected to one another in a rotationally fixed manner.
- the swash plate is held on the motor shaft 8 by a clamping screw 34, this clamping screw 34 is screwed into a threaded bore 35 of the motor shaft 8 at the end.
- the tensioning screw 34 is made of metal and carries between its head 36 and the threaded region 37 a support disk 38, the outer diameter of which is larger than that of the head 36.
- the head 36 and the support disk 38 are together surrounded by an electrically insulating plastic, which has the shape has a larger head 39 and embeds the upper part of the clamping disk 34 in it.
- This head 39 rests with its underside 40 on the swash plate 17 and presses it axially against the motor shaft 8. This fixes it to the motor shaft.
- the underside 40 has a central recess 41, in which the cap 29 engages with its front part. This results in a continuous jacket made of electrically insulating plastic in the area of the end of the motor shaft 8 and the tensioning screw 34, in this area no metallic parts are accessible from the outside. The swash plate and the housing of the motor are thus completely electrically isolated from the motor shaft.
- the head 39 can carry lateral attachment surfaces 42 for a wrench, for example the head can have a hexagonal cross section.
- the free edge 43 of the hood 13 connects to the edge of the housing 5 of the electric motor via an interposed ring 44 made of electrically insulating plastic, this ring 44 thus insulates the housing 5 of the electromotor from the hood 13 and thus from the Housing 14 of the pump.
- both parts have side lugs 45, 46 (FIG. 3), one of which has a through hole 47 and the other has an internally threaded hole 48.
- the ring 44 also has lateral projections 49 in the region of the projections 45 and 46, which are arranged between the projections 45 and 46 and electrically separate them from one another. In the area of the extension 49 there is also a through hole 50 which is aligned with the through hole 47 and the internally threaded hole 48.
- a clamping screw 51 is inserted into the through bores 47 and 50 and is screwed into the internally threaded bore 48.
- a sleeve 52 made of electrically insulating plastic is plugged onto this tensioning screw 51 in the upper part, said sleeve protruding surrounding the tensioning screw 51 into the through bore 47 of the one extension 45 and thereby the tensioning screw 51, which is made of metal, electrically from the extension 45 separates. It is ensured by this configuration that, due to the approaches and the tensioning screws, there is no electrically conductive connection in the connection area of the housing 5 and the housing 14, although the housing and the screw consist of electrically conductive material, in particular of metal can.
- the electrical separation of the electric motor and the pump can be further improved if the stator winding 11 facing the high-pressure pump 4 is also covered with a film 53 made of electrically conductive plastic with respect to the hood 13 and thus with respect to the housing 14. As shown in FIG. 1, this can be laid running along the hood, but it is also possible to cover the stator winding 11 with a corresponding film.
- a chamber 54 is attached to the housing 14 of the pump and receives electrical lines 55 or switching elements.
- This chamber is either itself made of electrically insulating plastic material or is fixed to the housing 14 of the pump in an electrically separated manner with the interposition of electrically insulating plastic material, so that the lines 55 and electrical switching elements in the interior of the chamber 54 through the chamber itself relative to the housing 14 be electrically isolated from the pump.
- Polyamides, polyesters, polyurethane or various thermosets can in particular be used as the electrically insulating plastic material.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4421330 | 1994-06-17 | ||
DE4421330 | 1994-06-17 | ||
PCT/EP1994/003086 WO1995035171A1 (de) | 1994-06-17 | 1994-09-15 | Hochdruckreinigungsgerät mit sicherheitsisolierung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0764059A1 true EP0764059A1 (de) | 1997-03-26 |
EP0764059B1 EP0764059B1 (de) | 1998-12-02 |
Family
ID=6520900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94928358A Expired - Lifetime EP0764059B1 (de) | 1994-06-17 | 1994-09-15 | Hochdruckreinigungsgerät mit sicherheitsisolierung |
Country Status (8)
Country | Link |
---|---|
US (1) | US5886436A (de) |
EP (1) | EP0764059B1 (de) |
JP (1) | JP2846476B2 (de) |
AT (1) | ATE173961T1 (de) |
CA (1) | CA2191967C (de) |
DE (2) | DE59407409D1 (de) |
DK (1) | DK0764059T3 (de) |
WO (1) | WO1995035171A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19632606A1 (de) * | 1996-08-13 | 1998-02-19 | Kaercher Gmbh & Co Alfred | Verdrängerpumpe, insbesondere für Hochdruckreinigungsgeräte |
US6092998A (en) * | 1998-03-20 | 2000-07-25 | Devilbiss Air Power Company | Pump for a pressure washer |
WO2001045263A1 (en) * | 1999-12-14 | 2001-06-21 | Broadcom Corporation | Frequency division/multiplication with jitter minimization |
DE19963703A1 (de) * | 1999-12-29 | 2001-07-05 | Bsh Bosch Siemens Hausgeraete | Antriebsvorrichtung für eine Waschmaschine |
US6892957B2 (en) * | 2002-08-29 | 2005-05-17 | Black & Decker Inc. | Pressure washer with improved mobility |
ITPD20030013U1 (it) * | 2003-02-25 | 2004-08-26 | Lavorwash Spa | Piattello oscillante per pompa a pistoni assiali |
DE102004056019A1 (de) * | 2004-11-16 | 2006-05-24 | Alfred Kärcher Gmbh & Co. Kg | Taumelantrieb |
GB0509982D0 (en) * | 2005-05-17 | 2005-06-22 | Johnson Electric Sa | Electric motor |
US7579724B2 (en) * | 2006-06-02 | 2009-08-25 | General Electric Company | Methods and apparatus for using an electrical machine to transport fluids through a pipeline |
US10328838B2 (en) | 2016-01-28 | 2019-06-25 | Kärcher North America, Inc. | Utility trailer with multiple modes of conveyance and operation |
USD793911S1 (en) | 2016-01-28 | 2017-08-08 | Kärcher North America, Inc. | Trailer device |
US11008115B2 (en) | 2017-05-09 | 2021-05-18 | Gulfstream Aerospace Corporation | Fuel system for an aircraft |
US20180327106A1 (en) * | 2017-05-09 | 2018-11-15 | Gulfstream Aerospace Corporation | Fuel system for an aircraft |
CN112867572A (zh) * | 2018-12-20 | 2021-05-28 | 阿尔弗雷德·卡赫欧洲两合公司 | 高压清洁机 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2259900A1 (de) * | 1972-12-07 | 1974-06-12 | Bosch Gmbh Robert | Handwerkzeugmaschine |
DE2837254A1 (de) * | 1978-08-25 | 1980-03-06 | Hilti Ag | Handbohrmaschine mit elektrischem antriebsmotor |
DE3243212A1 (de) * | 1982-11-23 | 1984-05-24 | SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim-Bissingen | Elektrischer kleinmotor mit einem anker |
DE8536175U1 (de) * | 1986-02-05 | 1987-07-02 | Alfred Kaercher Gmbh & Co, 7057 Winnenden, De | |
DE3882119D1 (de) * | 1987-05-08 | 1993-08-05 | Lutz Fa Karl | Elektromotor, insbesondere antriebsmotor fuer eine fass- oder behaelterpumpe. |
JPS6477771A (en) * | 1987-09-18 | 1989-03-23 | Hitachi Ltd | Variable delivery compressor |
DK595787D0 (da) * | 1987-11-13 | 1987-11-13 | Westergaard Knud Erik | Hoejtryksrenser |
US4992690A (en) * | 1988-10-07 | 1991-02-12 | Emerson Electric Co. | Combination motor endshield and pump housing |
DE3931814A1 (de) * | 1989-09-23 | 1991-04-04 | Black & Decker Inc | Handgefuehrter hochdruckreiniger |
DE4039926C2 (de) * | 1990-09-19 | 1994-08-11 | Elektra Beckum Ag | Axialkolbenpumpe, insbesondere für Wasser-Hochdruckreiniger |
WO1992016774A1 (de) * | 1991-03-13 | 1992-10-01 | Ina Wälzlager Schaeffler Kg | Taumellagerung |
JP2730319B2 (ja) * | 1991-04-26 | 1998-03-25 | 日本ビクター株式会社 | 磁気ディスク装置 |
EP0558389B1 (de) * | 1992-02-28 | 1996-01-10 | Hydro Rene Leduc | Hydraulische Kolbenpumpe mit Einlassventilen |
DK167178B1 (da) * | 1992-03-17 | 1993-09-13 | Westergaard Knud E Ind As | Hoejtryksrenser med indkapslet motor-pumpeaggregat |
DE9320361U1 (de) * | 1993-11-15 | 1994-05-19 | Suttner Gmbh & Co Kg | Axialkolbenpumpe |
DE4338896C2 (de) * | 1993-11-15 | 1997-03-13 | Suttner Gmbh & Co Kg | Axialkolbenpumpe |
-
1994
- 1994-09-15 WO PCT/EP1994/003086 patent/WO1995035171A1/de active IP Right Grant
- 1994-09-15 CA CA002191967A patent/CA2191967C/en not_active Expired - Fee Related
- 1994-09-15 DE DE59407409T patent/DE59407409D1/de not_active Expired - Fee Related
- 1994-09-15 JP JP8501517A patent/JP2846476B2/ja not_active Expired - Lifetime
- 1994-09-15 DK DK94928358T patent/DK0764059T3/da active
- 1994-09-15 EP EP94928358A patent/EP0764059B1/de not_active Expired - Lifetime
- 1994-09-15 DE DE9421814U patent/DE9421814U1/de not_active Expired - Lifetime
- 1994-09-15 AT AT94928358T patent/ATE173961T1/de not_active IP Right Cessation
-
1996
- 1996-12-16 US US08/767,728 patent/US5886436A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9535171A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE173961T1 (de) | 1998-12-15 |
DE9421814U1 (de) | 1996-10-24 |
CA2191967C (en) | 2000-03-21 |
WO1995035171A1 (de) | 1995-12-28 |
US5886436A (en) | 1999-03-23 |
EP0764059B1 (de) | 1998-12-02 |
DK0764059T3 (da) | 1999-08-16 |
JPH09509602A (ja) | 1997-09-30 |
DE59407409D1 (de) | 1999-01-14 |
JP2846476B2 (ja) | 1999-01-13 |
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