EP0793017A2 - Pompe pour appareil de nettoyage à haute pression - Google Patents

Pompe pour appareil de nettoyage à haute pression Download PDF

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Publication number
EP0793017A2
EP0793017A2 EP97101289A EP97101289A EP0793017A2 EP 0793017 A2 EP0793017 A2 EP 0793017A2 EP 97101289 A EP97101289 A EP 97101289A EP 97101289 A EP97101289 A EP 97101289A EP 0793017 A2 EP0793017 A2 EP 0793017A2
Authority
EP
European Patent Office
Prior art keywords
chamber
cylinder
bores
pump according
cylinder block
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
Application number
EP97101289A
Other languages
German (de)
English (en)
Other versions
EP0793017B1 (fr
EP0793017A3 (fr
Inventor
Roger Skoumal
Jürgen KLÖPFER
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 EP0793017A2 publication Critical patent/EP0793017A2/fr
Publication of EP0793017A3 publication Critical patent/EP0793017A3/fr
Application granted granted Critical
Publication of EP0793017B1 publication Critical patent/EP0793017B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B1/143—Cylinders
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing

Definitions

  • the invention relates to a pump for a high-pressure cleaning device with a cylinder block in which a plurality of parallel cylinder bores are arranged, with a cylinder head connected to the cylinder block and having bores aligned with the cylinder bores of the cylinder block, which together with these each have a along the bores by a drive
  • a pump for a high-pressure cleaning device with a cylinder block in which a plurality of parallel cylinder bores are arranged, with a cylinder head connected to the cylinder block and having bores aligned with the cylinder bores of the cylinder block, which together with these each have a along the bores by a drive
  • Form axially displaceable pump piston receiving guides with pump chambers in the cylinder head which are connected to the bores and which are connected to a suction line via inlet valves and to a pressure line via outlet valves, and to a bypass line which leads from the pressure line to the suction line and can be closed by a closing valve.
  • Such a pump is known for example from DE 39 28 006 C2.
  • a very space-saving construction is achieved with such a pump, since the essential parts can be accommodated cheaply in the cylinder block and in the cylinder head.
  • bypass line and the closing valve closing this bypass line in such constructions, which is also referred to as overflow in high-pressure cleaners.
  • the space between the cylinder bores in the cylinder block receiving the pump pistons is used to accommodate the chamber for the closing valve in this space.
  • This arrangement also has the advantage that the connecting lines between the pressure line on the one hand and the suction line on the other hand can be made particularly short, so that the space requirement for these lines is also extremely small.
  • the chamber is designed as a bore, the bore preferably narrows in stages in the direction of its inner end.
  • the chamber can enter the suction line, so that no additional connecting lines are necessary on this side.
  • the suction line enters perpendicularly to the longitudinal axis of the cylinder bores and transversely to the longitudinal axis of the chamber from the outer edge of the cylinder block between the cylinder bores in the cylinder block.
  • all the spaces between the cylinder bores are optimally used, in one direction by the suction line entering from the outside in, in a direction perpendicular to it by the chamber for the closing valve entering from the outside in.
  • a control piston dividing it into an upper and a lower partial space is axially displaceably displaceable, which displaces a valve body closing a valve opening. It is expedient if the valve opening is formed by an annular insert which bears against a lower step of the chamber.
  • valve body is connected to the control piston via a piston rod connected, which passes through the valve opening to form an annular gap and carries the valve body at its end projecting from the valve opening.
  • control piston is displaced radially outwards by a spring, so that the valve body rests against the valve opening to close it.
  • a channel enters the lower part space parallel to the longitudinal axis of the cylinder bores and is connected to a channel in the cylinder head which is connected to the pressure line. This also means that only a very short channel is required in the cylinder block; communication in the cylinder head can also be established by a very short connection between the pressure line and the lower part of the chamber.
  • a channel enters the upper part of the space, which is connected to a channel in the cylinder head, which in turn opens into the pressure line at a throttle point or downstream thereof.
  • the channels are integrated in the cylinder block or in the cylinder head and therefore do not require any additional space.
  • the channel in the cylinder block is arranged to run essentially tangentially to its outer edge. This arrangement makes it possible to produce the channel through a bore which is introduced into the cylinder block from the chamber at an angle to the longitudinal axis of the chamber. This will make production easier.
  • three cylinder bores are provided in the cylinder block, which are arranged on the corner points of an equilateral triangle.
  • the longitudinal axis of the chamber penetrates the connecting line of two corner points of the triangle vertically.
  • the chamber extends into the middle of the cylinder block.
  • control piston has a sealingly emerging extension from the chamber for actuating a switching device.
  • the movement of the control piston can be used to carry out additional switching operations; for example, the drive of the pump can be switched off when the spray lance is closed.
  • the high-pressure cleaning device shown in the drawing comprises an electric motor 1, which is arranged horizontally in a housing 2 and whose motor shaft 3 protrudes on both end faces.
  • the motor shaft 3 On one side, the motor shaft 3 carries a fan wheel 4, with which cooling air flowing around the motor is conveyed, on the opposite side a swash plate 5, which is the drive element for a high-pressure pump 6 attached to the motor housing.
  • This high-pressure pump is composed of two components, namely a cylinder block 7 and a cylinder head 8 lying flat against this. Both components can be designed, for example, as die-cast aluminum parts.
  • the cylinder block 7 has three cylinder bores 9 which pass through the cylinder block 7 and whose parallel longitudinal axes run parallel to the motor shaft 3. These cylinder bores 9 are arranged at the corner points of an equilateral triangle, the center of which lies approximately in the middle of the cylinder block 7.
  • cylinder head 8 there are also three bores 10 which are aligned with the cylinder bores 9 in the cylinder block 7 when the cylinder block 7 and the cylinder head 8 are connected to one another in a flat manner.
  • the mutually aligned cylinder bores 9 and bores 10 form a guide for a cylindrical pump piston 11, which is displaceable in the longitudinal direction in the two bores and is sealed against the bores by seals 12, 13.
  • the pump pistons 11 are supported by helical springs 14, which are supported on the one hand on the cylinder block 7 and on the other hand on a pressure sleeve 15 of the pump pistons 11, with their free end protruding from the cylinder bore 9 against the swash plate 5 pressed so that the pump pistons 11 experience an oscillating longitudinal displacement in the bores 9 and 10 when the motor shaft 3 rotates.
  • the bores 10 in the cylinder head 8 are designed as blind holes, they open into pump chambers 16 arranged in the cylinder head 8, which are connected via an inlet valve 17 to a suction line 18 and via an outlet valve 19 to a pressure chamber 20.
  • pump chambers 16 arranged in the cylinder head 8
  • the pressure chamber is connected to a pressure line shown in the drawing, through which the conveyed liquid is fed to a hose line 21, which in turn is connected to a hand-held spray gun 22 (FIG. 1).
  • a suction line 23 opens radially, which is located in the interior of a radially projecting pipe socket 24 formed on the cylinder block 7 and which extends between the cylinder bores 9 into the interior of the cylinder block 7, the suction line 23 being approximately through the The center of the triangle spanned by the three cylinder bores 9 runs through and ends below the cylinder bore 9 opposite the pipe socket 24 (FIG. 4).
  • Three bores 25 running parallel to the cylinder bores 9 stand with the intake line 23 in connection, these bores 25 are connected via sleeve-shaped connecting pieces 26 to the inlet valves 17 in the cylinder head and, together with these connecting pieces 26, form the suction lines 18.
  • the connecting pieces 26 are sealingly inserted in extensions 27, 28 in the cylinder block 7 or in the cylinder head 8 and thereby bridge the connection surface between the cylinder block 7 and the cylinder head 8.
  • a bore 29 that narrows in stages towards the center is machined in the cylinder block 7, which enters the space 30 between two adjacent cylinder bores 9 and which opens into the intake line 23.
  • This bore 29 forms a chamber for receiving a so-called overflow.
  • a closing valve 30 is inserted into the chamber, which comprises a control piston 33 which divides the chamber into an upper part 31 and into a lower part 32 and can be displaced in the longitudinal direction in a sealed manner and which carries a piston rod 34 at its lower end. This passes through a central opening 35 of an annular insert 36 which is supported on a lower step 37 of the narrowing bore 29 and which is sealed off from the bore 29 by an O-ring seal 38.
  • the outer diameter of the piston rod is smaller than the diameter of the central opening 35, so that an annular gap is formed between the two parts.
  • the piston rod 34 carries a conically widening valve body 39 which, through a coil spring 40, which is arranged in the lower part space 32 and surrounds the piston rod 34 and is supported on the insert 36 and on the control piston 33, into a central opening 35 closing system on the insert 36 is moved.
  • a sealing body 41 is inserted in a sealed manner in the upper part space 31 and is held in the bore 29 by an end plate 42.
  • An extension 43 of the piston rod 34 passes through the closure body 41 in a sealed manner and protrudes outward beyond the end plate 42.
  • This extension 43 is used to actuate a switch 44 which is arranged above the cylinder block 7 in the high-pressure cleaning device. When operated appropriately, this switch 44 switches the electric motor 1 on or off.
  • the stepped bore 29 opens into the suction line 23.
  • a channel 45 emerges from the lower subspace 32 parallel to the longitudinal axis of the cylinder bores 9 and is connected to the pressure chamber 20 via a connecting piece 46 and via a channel 47 in the cylinder head 8. Similar to the connecting piece 26, the connecting piece 46 is inserted in a sealed manner in extensions 48 and 49 of the cylinder head 8 and the cylinder block 7 and bridges the parting plane between cylinder block 7 and cylinder head 8 in this area.
  • a line 50 enters the upper subspace 31 and is designed as a bore which runs essentially tangentially to the outer surface of the cylinder block 7 in the region of its edge (FIG. 4).
  • This hole is arranged so that it can be introduced from the upper side of the stepped hole 29, for this purpose a corresponding recess 51 is provided in the side wall of the hole 29 opposite the line 50, which enables straight access to the line 50.
  • the line 50 opens into a channel 52 which runs parallel to the cylinder bores 9 and, in the same way as the channel 45, is connected via a connecting piece (not shown in the drawing) to a channel in the cylinder head 8 (also not shown in the drawing).
  • This channel leads to a pressure line leading from the pressure space 20 and opens into it in the area of a constriction of the pressure line or downstream of such a constriction.
  • the pump pistons 11 are driven in an oscillating manner by the swash plate 5 and thereby pump liquid from the suction lines 18 into the pressure chamber 20 in the manner described.
  • the liquid thereby becomes the suction line 18 through the pipe socket 24, the suction line 23, the bores 25 and the connecting pieces 26.
  • liquid under the pump pressure passes from the pressure chamber 20 via the channel 47, the connecting piece 46 and the channel 45 into the lower sub-chamber 32 of the bore 29, and the upper sub-chamber 31 is located via the line 50 and the channel 52 in the described way in connection with the pressure line.
  • the flowing liquid in the pressure line results in a pressure drop in the area of the constriction in the pressure line, and the throttling effect of the constriction also results in a pressure drop in relation to the pressure chamber 20 downstream of the constriction.
  • a pressure is applied to the upper subspace 31 which is lower than the pressure in the lower subspace 32. Together with the force of the coil spring 40, this causes the control piston 33 to be pushed upward, the valve body 39 closes the central opening 35.
  • the closing valve in the bore 29 remains closed, the liquid conveyed by the pump passes from the pressure chamber 20 via the subsequent pressure line to the hand spray gun 22.
  • the movement of the control piston 33 and the movement of the extension 43 connected to it also leads to an actuation of the switch 44, by means of which the motor can be switched off. This makes it possible to avoid unnecessary operation of the engine when the handgun is closed.
  • the engine is restarted when the hand spray gun 22 is opened, as a result of which the pressure in the pressure line drops again, and this leads to a pressure drop in the upper part space 31, so that the control piston 33 is moved back into the closed position under the action of the coil spring 40 can be.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Gas Separation By Absorption (AREA)
EP97101289A 1996-03-01 1997-01-28 Pompe pour appareil de nettoyage à haute pression Expired - Lifetime EP0793017B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19607881A DE19607881C2 (de) 1996-03-01 1996-03-01 Pumpe für ein Hochdruckreinigungsgerät
DE19607881 1996-03-01

Publications (3)

Publication Number Publication Date
EP0793017A2 true EP0793017A2 (fr) 1997-09-03
EP0793017A3 EP0793017A3 (fr) 1998-11-18
EP0793017B1 EP0793017B1 (fr) 2001-06-20

Family

ID=7786914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97101289A Expired - Lifetime EP0793017B1 (fr) 1996-03-01 1997-01-28 Pompe pour appareil de nettoyage à haute pression

Country Status (4)

Country Link
EP (1) EP0793017B1 (fr)
AT (1) ATE202406T1 (fr)
DE (1) DE19607881C2 (fr)
DK (1) DK0793017T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1496252A2 (fr) * 2003-07-10 2005-01-12 Lavorwash S.p.A. Pompe hydraulique à pistons axiaux
WO2008125267A1 (fr) * 2007-04-11 2008-10-23 Alfred Kärcher Gmbh & Co.Kg Appareil de nettoyage à haute pression
WO2011039117A1 (fr) * 2009-10-01 2011-04-07 Alfred Kärcher Gmbh & Co. Kg Pompe pour nettoyeur haute pression
WO2013060386A1 (fr) * 2011-10-28 2013-05-02 Alfred Kärcher Gmbh & Co. Kg Nettoyeur haute pression
US8439653B2 (en) 2009-10-01 2013-05-14 Alfred Kaercher Gmbh & Co. Kg Pump for a high-pressure cleaning apparatus
US8568109B2 (en) 2009-10-01 2013-10-29 Alfred Kaercher Gmbh & Co. Kg Pump for a high-pressure cleaning device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3898016B1 (fr) * 2018-12-20 2023-08-16 Alfred Kärcher SE & Co. KG Appareil de nettoyage haute pression

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1136634A (en) * 1965-03-29 1968-12-11 Bennes Marrel Hydraulic swash-plate type
US3679328A (en) * 1970-03-27 1972-07-25 Applied Power Ind Inc Variable pressure sensitive pump
DE8514497U1 (de) * 1985-05-15 1985-07-18 Kränzle, Josef, 7918 Illertissen Hochdruckkolbenpumpe
DE4338896A1 (de) * 1993-11-15 1994-06-30 Suttner Gmbh & Co Kg Axialkolbenpumpe
DE4445519C1 (de) * 1994-12-20 1996-06-05 Kaercher Gmbh & Co Alfred Kolbenpumpe für ein Hochdruckreinigungsgerät
DE29611935U1 (de) * 1995-07-14 1996-09-05 Lavorwash S R L Taumelscheiben-Pumpenkonstruktion, insbesondere für Wasserstrahlreinigungsgeräte

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248622C2 (de) * 1982-12-30 1985-10-17 Alfred Kärcher GmbH & Co, 7057 Winnenden Hochdruckreinigungsgerät
DK165129C (da) * 1988-09-02 1993-02-22 Westergaard Knud E Ind As Aksialstempelpumpe til vaesker, navnlig til brug i hoejtryksrenseapparater
DE9013630U1 (fr) * 1990-09-28 1991-01-31 Speck-Kolbenpumpenfabrik Otto Speck Gmbh & Co. Kg, 8192 Geretsried, De

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1136634A (en) * 1965-03-29 1968-12-11 Bennes Marrel Hydraulic swash-plate type
US3679328A (en) * 1970-03-27 1972-07-25 Applied Power Ind Inc Variable pressure sensitive pump
DE8514497U1 (de) * 1985-05-15 1985-07-18 Kränzle, Josef, 7918 Illertissen Hochdruckkolbenpumpe
DE4338896A1 (de) * 1993-11-15 1994-06-30 Suttner Gmbh & Co Kg Axialkolbenpumpe
DE4445519C1 (de) * 1994-12-20 1996-06-05 Kaercher Gmbh & Co Alfred Kolbenpumpe für ein Hochdruckreinigungsgerät
DE29611935U1 (de) * 1995-07-14 1996-09-05 Lavorwash S R L Taumelscheiben-Pumpenkonstruktion, insbesondere für Wasserstrahlreinigungsgeräte

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1496252A2 (fr) * 2003-07-10 2005-01-12 Lavorwash S.p.A. Pompe hydraulique à pistons axiaux
EP1496252A3 (fr) * 2003-07-10 2006-06-14 Lavorwash S.p.A. Pompe hydraulique à pistons axiaux
US7195464B2 (en) 2003-07-10 2007-03-27 Lavorwash S.P.A. Hydraulic axial piston pump
CN100472065C (zh) * 2003-07-10 2009-03-25 拉瓦沃希股份公司 液压轴向活塞泵
WO2008125267A1 (fr) * 2007-04-11 2008-10-23 Alfred Kärcher Gmbh & Co.Kg Appareil de nettoyage à haute pression
US8790092B2 (en) 2007-04-11 2014-07-29 Alfred Kaercher Gmbh & Co. Kg High-pressure cleaning appliance
WO2011039117A1 (fr) * 2009-10-01 2011-04-07 Alfred Kärcher Gmbh & Co. Kg Pompe pour nettoyeur haute pression
CN102686882A (zh) * 2009-10-01 2012-09-19 阿尔弗雷德·凯驰两合公司 用于高压清洁设备的泵
US8439653B2 (en) 2009-10-01 2013-05-14 Alfred Kaercher Gmbh & Co. Kg Pump for a high-pressure cleaning apparatus
US8568109B2 (en) 2009-10-01 2013-10-29 Alfred Kaercher Gmbh & Co. Kg Pump for a high-pressure cleaning device
US8684699B2 (en) 2009-10-01 2014-04-01 Alfred Kaercher Gmbh & Co. Kg Pump for a high-pressure cleaning appliance
WO2013060386A1 (fr) * 2011-10-28 2013-05-02 Alfred Kärcher Gmbh & Co. Kg Nettoyeur haute pression

Also Published As

Publication number Publication date
EP0793017B1 (fr) 2001-06-20
ATE202406T1 (de) 2001-07-15
DK0793017T3 (da) 2001-09-03
DE19607881A1 (de) 1997-09-04
DE19607881C2 (de) 2003-07-17
EP0793017A3 (fr) 1998-11-18

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