EP2140140A1 - Pompe à pistons destinée à un nettoyeur haute pression - Google Patents

Pompe à pistons destinée à un nettoyeur haute pression

Info

Publication number
EP2140140A1
EP2140140A1 EP08735205A EP08735205A EP2140140A1 EP 2140140 A1 EP2140140 A1 EP 2140140A1 EP 08735205 A EP08735205 A EP 08735205A EP 08735205 A EP08735205 A EP 08735205A EP 2140140 A1 EP2140140 A1 EP 2140140A1
Authority
EP
European Patent Office
Prior art keywords
piston
guide
chamber
pump according
piston pump
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Withdrawn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
EP08735205A
Other languages
German (de)
English (en)
Inventor
Robert Nathan
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 EP2140140A1 publication Critical patent/EP2140140A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • 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
    • 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
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/126—Cylinder liners
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners

Definitions

  • the invention relates to a piston pump for a high-pressure cleaner with at least one pump chamber into which a reciprocable piston is immersed and which is connected via a suction valve with a suction line for sucking liquid and a pressure valve with a pressure line for discharging pressurized liquid wherein the at least one piston is slidably supported on a piston guide.
  • Such piston pumps are known from DE 198 01 146 Cl. With their help, a liquid, preferably water, sucked, placed under pressure and then discharged.
  • An accessory device can be connected to the pressure line, for example a high-pressure hose which carries at its free end a dispensing device, in particular a spray lance or spray nozzle.
  • a piston guide is used, which is designed as a separate component and positioned between the piston pump and a pump drive.
  • the piston pump usually has a plurality of pistons, preferably three pistons, each immersed in a pumping chamber and are held together displaceable on the separate piston guide.
  • the piston guide must be aligned exactly with the pumping chambers to prevent the pistons from tilting.
  • the production of the pump chambers and the piston guide must be carried out with very low manufacturing tolerances and the assembly of the piston guide on the piston pump must be carried out very carefully and by experienced personnel. the. Even with proper installation of the piston guide on the piston pump, there is still the danger that during operation of the piston pump, a piston jammed due to the different thermal expansion of the piston guide and surrounding the respective pumping chamber region of the piston pump.
  • Object of the present invention is to develop a piston pump of the type mentioned in such a way that the risk of jamming a piston is reduced.
  • the piston pump for each piston has a piston chamber in which a piston guide is arranged with two aligned mutually aligned guide surfaces against which the respective piston slidably.
  • the piston pump according to the invention has a piston chamber for each piston, in which a piston guide is arranged.
  • Each piston is associated with a separate piston guide, and the respective piston guide is positioned in a piston chamber of the piston pump.
  • a common piston guide for all pistons of the piston pump can thus be omitted. Instead, a separate piston guide is used for each piston, which is integrated into the respective piston chamber.
  • Each piston guide has two guide surfaces, which are aligned with each other and to which the respective piston slidingly abuts. It has been found that thereby the risk of jamming a piston can be significantly reduced. Also the manufacture and assembly of the piston pump including the piston guide designed relatively simple and can be done with larger tolerances within a short time. Due to its positioning within the piston chamber, the piston guide has virtually the same temperature as the area of the piston pump surrounding the respective pump chamber. This has the consequence that even during operation mechanical stresses that could lead to jamming of the piston can be kept very low.
  • a particularly simple assembly is achieved in an advantageous embodiment, characterized in that the piston guide from the pump chamber facing away from the side - that is from behind - can be inserted into the piston chamber.
  • the piston guide comprises two fixed in the piston chamber guide elements, each forming a guide surface for the piston.
  • the two guide elements can be arranged axially spaced from each other.
  • the two guide elements lie directly against one another. This will be explained in more detail below.
  • At least one guide element is glued into the piston chamber.
  • both guide elements are glued into the piston chamber. This facilitates the assembly of the piston guide.
  • At least one guide element is configured as a guide ring surrounding the piston in the circumferential direction.
  • the guide ring can open simple manner are used in the back of the piston chamber and he defines a piston surrounding the piston in the circumferential direction guide surface on which the piston is slidably applied.
  • At least one sealing ring is arranged between the two guide surfaces, which surrounds the piston in the circumferential direction.
  • the sealing ring can be designed in the form of an oil seal.
  • the sealing ring comprises at least one sealing lip, which rests sealingly on the outer circumference of the piston. It when the sealing ring comprises two V-shaped mutually aligned sealing lips, which rest in each case sealingly on the outer circumference of the piston is particularly favorable.
  • a drainage hole opens into the piston chamber between the two guide surfaces. In the event of a leak, liquid can be led out of the piston chamber via the drainage hole.
  • At least one guide surface is formed by a guide element of the piston guide, which supports a surrounding the piston in the circumferential direction sealing ring in the axial direction.
  • the guide element thus not only serves to guide the piston, but also forms a support for a sealing ring.
  • the sealing ring may for example be designed in the form of a high-pressure seal, with which the pump chamber is sealed against the piston chamber. It can also be provided that the sealing ring is designed as an oil seal, which prevents the penetration of oil into the piston chamber.
  • at least one sealing ring is clamped between a constriction of the piston chamber and a guide element of the piston guide.
  • the constriction may be in the form of a step. It can also be provided that the constriction has a conical or rounded shape.
  • a sealing ring is clamped between two guide elements, which each form a guide surface for the piston.
  • Such a configuration has the advantage that a narrowing of the crank chamber for supporting the sealing ring can be omitted.
  • the assembly of the piston guide is simplified in that the piston guide forms an insertable into the piston chamber insert with two mutually spaced guide surfaces on which the piston is slidably applied.
  • the insert can be designed in the manner of a cartridge which can be inserted into the piston chamber.
  • the insert can be glued to the piston chamber. It is advantageous if, in addition to the two guide surfaces, the insert has at least one sealing ring which surrounds the piston in the circumferential direction.
  • the insert comprises a front and a rear insert, each forming a guide element with a guide surface and connected to each other.
  • the inserts can be sleeve-shaped, for example.
  • the two insert parts are connected to one another via a plug connection. It can be provided, for example, that one of the insert parts comprises a collar which can be inserted into the other insert part.
  • the two insert parts can be locked together in a preferred embodiment.
  • the sealing ring may be formed as a high-pressure seal, which seals the pump chamber relative to the piston chamber.
  • the sealing ring may have at least one sealing lip, which is preferably inclined obliquely to the longitudinal axis of the piston in the direction of the pumping chamber.
  • FIG. 1 shows a sectional view of a piston pump according to the invention with a first embodiment of a piston guide inserted in a piston chamber;
  • Figure 2 is a sectional view of a second embodiment of a piston guide for the piston pump of Figure 1;
  • Figure 3 is a sectional view of a third embodiment of a piston guide for the piston pump of Figure 1 and
  • FIG. 4 shows a sectional view of a fourth embodiment of a piston guide for the piston pump from FIG. 1.
  • FIG. 1 schematically shows a piston pump 10 according to the invention. This can be placed in a conventional manner on a pump drive, not shown in the drawing, known per se, which comprises a swash plate against which the piston explained in more detail below.
  • the piston pump 10 has a plurality of reciprocally movable pistons 12, each of which pass through a piston chamber 14 and dive into a pump chamber 16. Due to the reciprocating movement of the pistons 12, the volumes of the pumping spaces 16 can be changed periodically.
  • the pump chambers 16 are in each case via a suction valve 18 with a suction line 20 in communication, via which a liquid, preferably water, can be sucked from a supply.
  • the pump chambers 16 are in each case connected via a pressure valve 22 and a central non-return valve common to all pump chambers 16.
  • valve 24 with a pressure line 26 in fluid communication, which opens into a control chamber 28.
  • Connected to the control chamber 28 in the flow direction of the pressurized liquid is a connecting line 30, which opens into an outlet line 34 formed by a pressure port 32, to which, for example, a high-pressure hose can be connected.
  • bypass line 36 connects the pressure line 26 with the suction line 20th
  • a control piston 40 is slidably held, which is integrally connected to an injector 42.
  • the injector 42 dips into the connecting line 30 and has in the usual way a cross-sectional constriction, from which a supply line 44 branches off via a transverse bore.
  • a supply line 44 and an adjoining this connecting piece 46 of the pressurized liquid can be added to a chemical.
  • the injector 42 is arranged on the end face of the control piston 40 facing away from the pressure line 26.
  • the control piston 40 On its side facing the pressure line 26, the control piston 40 carries a parallel to the injector 42 and offset to this arranged shift rod 48, which passes through a through hole 50 with its free end portion.
  • the shift rod 48 may be a known per se and therefore not shown in the drawing switching device tion are actuated by the shift rod 48 is moved.
  • the pump drive can be switched on and off.
  • the control piston 40 is frontally acted upon by the pressure prevailing in the supply line 44 and the pressure prevailing at the rear of the injector 42. In normal operation of the piston pump 10, the injector 42 is flowed through by pressurized liquid.
  • the cross-sectional constriction of the injector 42 leads to the generation of a negative pressure in the supply line 44 branched off from the injector.
  • the negative pressure is transmitted to the end face of the control piston 40, which is acted upon at the rear by the pressure prevailing upstream of the injector.
  • the thus acting on the control piston 40 pressure difference has the consequence that this occupies a forward position in which the coupled via the shift rod 48 to the control piston 40 switching device remains unactuated and thus the drive of the pump is not interrupted.
  • the pistons 12 are driven to reciprocate.
  • a piston guide which is arranged in the respective piston chamber 14, is used in each case.
  • a first embodiment of a piston guide is designated by the reference numeral 52. It comprises a first guide element in the form of a first guide ring 54 and a second guide element in the form of a second guide ring 56.
  • the two guide rings 54, 56 are arranged axially spaced from one another and support on their respective end face, which faces the pump chamber 16, a first Sealing element 58 and a second sealing element 60 from.
  • the first sealing element 58 is designed in the form of a high-pressure seal which seals the pump chamber 16 with respect to the piston chamber 14.
  • the second sealing element 60 is formed in the form of an oil seal, which prevents the penetration of oil into the piston chamber 14. For this purpose, it has two V-shaped mutually projecting sealing lips 61, 62, which bear sealingly on the outer circumference of the piston 12.
  • the first sealing element 58 bears against a conical constriction 64 of the piston chamber 14, and the second sealing element 60 bears against a stepped constriction 65 of the piston chamber 14.
  • the piston 12 is surrounded within the piston chamber 14 by an annular space 67 into which a drainage hole 68 opens.
  • the two guide rings 54 and 56 each define a guide surface 70 and 71 for the piston 12, which abuts the guide surfaces 70, 71 slidably.
  • the guide surfaces 70 and 71 are aligned with each other.
  • the guide rings 54 and 56 can be used for mounting the piston pump 10 back into the piston chamber 14. For axial fixing of the guide rings 54 and 56, these can be glued to the piston chamber 14.
  • the piston guide 74 is configured in the form of a preassembled insert and comprises a front insert part 75 and a rear insert part 76, which can be connected to one another via a plug connection and jointly inserted into the piston chamber 14 at the rear.
  • the front insert member 75 forms at its front end a guide ring 78 with a guide surface 79 and the rear insert member 76 forms at a distance from the front guide ring 78, a rear guide ring 81 with a rear guide surface 82.
  • the piston 12 sliding abut.
  • the rear insert part 76 facing away integrally connects a support ring 84, on which the first sealing element 58 can be supported, wherein this is biased in the direction of the pump chamber 16.
  • the rear insert 76 dives with a collar 86 in the front insert part 75, which has a step 88 at a distance from the collar 86.
  • the step 88 forms a constriction of the front insert part 75.
  • a retaining ring 90 is inserted. clamped, which carries a sealing ring 91 with two V-shaped mutually aligned sealing lips 92 and 93.
  • the retaining ring 90 is made of metal, whereas the sealing ring 91 is made of a plastic material.
  • the front insert part 75 has on the side facing away from the support ring 84 of the front guide ring 78 has a transverse bore 95, which is aligned after insertion of the piston guide 74 into the piston chamber 14 with the drainage hole 68 of the piston chamber 14.
  • FIG. 3 shows a third embodiment of a piston guide, designated overall by the reference numeral 98, which, like the piston guide shown in FIG. 4, is designed substantially identically to the piston guide 74 illustrated in FIG. 2.
  • FIGS The same reference numerals are used as in Figure 2. With regard to these components reference is made to the above explanations to avoid repetition.
  • the piston guide 98 shown in Figure 3 differs from the piston guide 74 in that the two insert parts 75 and 76 abut each other in the piston guide 98 without a plug connection is used.
  • the two insert parts 75, 76 are glued together and take between them a retaining ring 99 on which a sealing ring 100 is held with V-shaped mutually aligned sealing lips 101, 102.
  • FIG. 4 shows a fourth embodiment of a piston guide, which is designated as a whole by the reference numeral 106 and in which likewise two insert parts 75, 76 connected to one another via a plug connection are used come.
  • the step 88 of the front insert part 75 in combination with the end face of the collar 86 of the rear insert 76 forms a dovetail-shaped receptacle for a retaining ring 107 to which a sealing ring 108 with two V-shaped aligned sealing lips 109 and 110 is fixed ,
  • the piston guides 52, 74, 98 and 106 make it possible in a structurally simple manner to guide the piston 12 of the piston pump 10 reliably in the axial direction, without the risk that the piston 12 tilt.
  • the assembly of the piston guides 52, 74, 98 and 106 is very simple, by being able to be inserted from behind into the piston chamber 14 of the piston pump 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe à pistons destinée à un nettoyeur haute pression, comportant au moins un espace de pompe dans lequel plonge un piston pouvant décrire un mouvement alternatif, l'espace de pompe étant connecté au moyen d'une soupape d'aspiration à une conduite d'aspiration pour l'aspiration de liquide, et au moyen d'une soupape de pression à une conduite de pression pour la distribution de liquide mis sous pression. Le ou les pistons sont guidés de façon coulissante dans un guide de piston. L'invention vise à améliorer la pompe à pistons de telle manière que le risque de blocage d'un piston est réduit. A cet effet, la pompe à pistons présente une chambre de piston pour chaque piston, contenant un guide de piston pourvu de deux surfaces de guidage disposées de façon alignée l'une par rapport à l'autre, sur lesquelles le piston respectif s'appuie de façon coulissante.
EP08735205A 2007-04-20 2008-04-12 Pompe à pistons destinée à un nettoyeur haute pression Withdrawn EP2140140A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007020300A DE102007020300A1 (de) 2007-04-20 2007-04-20 Kolbenpumpe für ein Hochdruckreinigungsgerät
PCT/EP2008/002920 WO2008128667A1 (fr) 2007-04-20 2008-04-12 Pompe à pistons destinée à un nettoyeur haute pression

Publications (1)

Publication Number Publication Date
EP2140140A1 true EP2140140A1 (fr) 2010-01-06

Family

ID=39580131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08735205A Withdrawn EP2140140A1 (fr) 2007-04-20 2008-04-12 Pompe à pistons destinée à un nettoyeur haute pression

Country Status (3)

Country Link
EP (1) EP2140140A1 (fr)
DE (1) DE102007020300A1 (fr)
WO (1) WO2008128667A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2586589T3 (es) * 2012-01-20 2016-10-17 Alfred Kärcher Gmbh & Co. Kg Bomba de émbolos para un aparato de limpieza a alta presión
DE102021125838A1 (de) * 2021-10-05 2023-04-06 Solo Kleinmotoren Gmbh Kolben-Hochdruckpumpe mit kleinem Fördervolumen
US11754068B1 (en) * 2022-09-21 2023-09-12 Halliburton Energy Services, Inc. Packing sleeve for pump fluid end

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2913229C2 (de) * 1979-04-03 1984-05-17 Woma-Apparatebau Wolfgang Maasberg & Co Gmbh, 4100 Duisburg Gleitflächendichtung
DE4027794C2 (de) * 1990-09-01 2002-06-20 Continental Teves Ag & Co Ohg Hydraulische Radialkolbenpumpe
DE4112448C2 (de) 1991-04-12 1994-06-16 Bran & Luebbe Hochdruckstopfbuchse
DE4445522C2 (de) * 1994-12-20 1998-05-14 Kaercher Gmbh & Co Alfred Kolbenpumpe für ein Hochdruckreinigungsgerät
DE19801146C1 (de) 1998-01-14 1999-06-24 Kaercher Gmbh & Co Alfred Kolbenpumpe für ein Hochdruckreinigungsgerät
DE19902018A1 (de) * 1999-01-20 2000-07-27 Bosch Gmbh Robert Kolbenpumpe
DE19904926A1 (de) * 1999-02-06 2000-08-10 Bosch Gmbh Robert Pumpenaggregat für eine schlupfgeregelte, hydraulische Fahrzeugbremsanlage
DE102004020548A1 (de) * 2004-04-27 2005-11-24 Robert Bosch Gmbh Kolbenpumpe mit verbessertem Führungsverhalten
DE102005050009B4 (de) 2005-10-11 2007-07-05 Alfred Kärcher Gmbh & Co. Kg Hochdruckreinigungsgerät

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008128667A1 *

Also Published As

Publication number Publication date
DE102007020300A1 (de) 2008-10-23
WO2008128667A1 (fr) 2008-10-30

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