EP0574420A1 - Appareil de nettoyage a haute pression. - Google Patents

Appareil de nettoyage a haute pression.

Info

Publication number
EP0574420A1
EP0574420A1 EP92904614A EP92904614A EP0574420A1 EP 0574420 A1 EP0574420 A1 EP 0574420A1 EP 92904614 A EP92904614 A EP 92904614A EP 92904614 A EP92904614 A EP 92904614A EP 0574420 A1 EP0574420 A1 EP 0574420A1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
cleaning device
insert
pressure cleaning
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
EP92904614A
Other languages
German (de)
English (en)
Other versions
EP0574420B1 (fr
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 EP0574420A1 publication Critical patent/EP0574420A1/fr
Application granted granted Critical
Publication of EP0574420B1 publication Critical patent/EP0574420B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F04B53/007—Cylinder heads
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type

Definitions

  • the invention relates to a high-pressure cleaning device with a piston pump with a housing in which there is at least one pumping chamber which opens via an outlet valve into a pressure chamber arranged in the housing, and with a pressure line emerging therefrom with a constriction for generating a flow-dependent pressure difference upstream or downstream of the constriction.
  • High-pressure cleaning devices of this type are known, in the case of which a branch line emerges downstream of the constriction in the pressure line and is optionally used as a chemical suction line or as a control line for a closing valve of a bypass line.
  • the design effort in known high-pressure cleaning devices of this type is relatively large, since separate control lines are necessary between the pressure line and the individual housing sections and since the housings also have a very complicated shape due to the different housing sections.
  • the object of the invention is to design a generic high-pressure cleaning device in such a way that a particularly simple structure is achieved and that in particular the dimensions and the weight of the pump unit can be reduced.
  • This object is achieved according to the invention in a high-pressure cleaning device of the type described at the outset by arranging a cavity directly connected to the pumping chamber, in which an insert is inserted in a sealed manner, and inserting the cavity into the pressure chamber facing the pumping chamber and in divides a suction chamber and that the suction chamber is connected to the pressure line downstream of the constriction.
  • the housing usually produced as a die-cast workpiece can be made very simple. It is in fact sufficient to provide a single cavity in the housing at the outlet side of the pumping chambers and to insert an insert in a sealed manner into this cavity, which divides the cavity into the pressure chamber and a suction chamber.
  • the suction chamber can be used for chemical suction and for controlling a bypass line. No additional complicated configurations are necessary on the housing.
  • a chemical suction line opens into the suction chamber. Due to the negative pressure generated in the pressure line, the chemical lie sucked into the suction chamber via the chemical suction line, this chemical reaches the liquid conveyed through the pressure line via the connection to the pressure line. A special chemical suction line leading into the pressure line is therefore no longer necessary.
  • the chemical suction line is closed with a check valve which can be opened in the inflow direction and which can optionally be spring-loaded. In this way, chemical suction occurs only when the pressure drop across the constriction exceeds a certain value.
  • an injector penetrates the suction chamber in a sealed manner, which is in flow connection with the pressure chamber on the one hand and the pressure line emerging from the housing on the other hand and thus forms part of the pressure line and which also has at least one opening is connected to the suction chamber.
  • the injector is kept in use. This also simplifies the structure of the pump housing.
  • the injector can be inserted, for example, in a sealed manner into an opening that extends through the insert.
  • the injector can be made of plastic.
  • the insert is made of plastic.
  • Such an insert is easier to manufacture than a die-cast part with a complicated structure, moreover such a part can generally be manufactured with thinner walls and therefore has a lower weight due to the lighter material and the thinner wall thicknesses.
  • a preferred embodiment results when the housing is divided at the level of the insert and in this area a ring seal is arranged on the insert and on the two housing parts.
  • This ring seal takes on a double task, namely the sealing of the two housing parts against one another and the sealing of the insert against the housing.
  • the housing part which comes into contact with the chemical is made resistant to chemicals, for example by choosing a suitable, higher quality material or by a plastic coating.
  • the rest of the housing, however, which contains the pumping chambers and the pressure accommodates the chamber, can be made in a conventional manner from less resistant material, since this housing part only comes into contact with the pure liquid.
  • a further advantageous embodiment is characterized in that the insert carries an outlet valve for each pump chamber, which valve is inserted in a sealed manner in a connection between the pump chamber and the pressure chamber.
  • valve seat of the outlet valve is integrally formed on the insert.
  • valve seat of the outlet valve is designed as a plastic ring which can be inserted in the connecting line between the pump chamber and the pressure chamber and is held on holding arms of the insert. This facilitates the assembly of the outlet valve and in particular the use of the valve body.
  • This valve body of the exhaust valve is preferably also made of plastic.
  • outlet valves are held on the insert via holding arms of different lengths, if necessary, so that their distance from all pumping chambers is the same. This ensures that the pump volume of all pump chambers is the same, nevertheless with the insertion of an insert for all pumping chambers, the equipment with exhaust valves can be carried out simultaneously.
  • a bypass line leads from the pressure chamber in the housing to the suction side of the pumping chambers, a closing valve closing the bypass line opposite the pressure chamber being held on the insert.
  • the valve seat of the closing valve can be formed in one piece with the insert; in addition, it can be inserted into the bypass line in a sealed manner, that is to say the assembly is also facilitated in this case, since when the insert is inserted the closing valve is also immediately positioned in the bypass line.
  • This control piston is actuated by the differential pressure in the pressure chamber and in the suction chamber such that it opens the closing valve as soon as the pressure in the suction chamber exceeds a certain value, as is the case, for example, when the pressure line on the outlet side is closed.
  • a particularly space-saving construction of the pump housing is obtained if all of the pumping chambers are in the housing Connection lines guiding the pressure chamber and optionally the bypass line are arranged next to one another and parallel to one another in one plane.
  • the pump housing can be made very flat, and this arrangement also makes it possible to use both the closing valve for the bypass line with the associated control piston and the closing valves for all pumping chambers in one operation, namely simply by inserting the insert in the housing.
  • Figure 1 is a perspective exploded view of the open pump housing with insert and
  • FIG. 2 is a sectional view of the assembled pump housing taken along line 2-2 in Figure 1.
  • the high-pressure pump shown in the drawing comprises a housing 1 in the form of a plate, which has a fastening flange 2, 3 protruding from the plane of the plate on each of the two opposite end edges.
  • a cavity 4 which is open to the outside and into which a liquid supply line 5 opens.
  • three parallel bores 6 lead through the plate-shaped housing 1 through to a cavity 7 arranged in the area of the fastening flange 3.
  • Line 8 in the housing 1 which also runs parallel to the holes 6.
  • Three step blind holes 9 are made in the housing 1 from the top, the center points of which are located on the corner points of an equilateral triangle. Each of these blind holes 9 is connected to one of the holes 6 which penetrate the blind hole 9. Each blind hole 9 forms a pump chamber 10, in each of which a piston 11 is sealed.
  • the pistons 11 are shown in dash-dot lines in FIG. 1, they are driven in an oscillating manner parallel to their longitudinal axis and in the process plunge more or less deeply into the blind holes 9. The drive can take place, for example, via a swash plate, not shown in the drawing, which bears against the end faces of the pistons 11.
  • a suction valve 12 is inserted in a sealed manner into the bores 6 on the side facing the cavity 4.
  • these suction valves 12 can be designed as independent inserts with a valve seat 13 and a valve body 14, in which the valve body 14 is pressed against the valve seat 13 by means of a spring 15. Sealing with respect to the bore 6 takes place via an O-ring seal 16 which is inserted into a circumferential groove 17 of the suction valve 12.
  • the bore 6 can have a widening which tapers slightly conically in the direction of flow, so that the suction valve 12 bears against an annular shoulder 18 in the bore 6 (FIG. 2).
  • a cover 19 is placed on the housing 1, which is attached to the fastening flange 3 and closes off the cavity 7 of the housing 1. Part of this cavity 7 is located in the cover 19.
  • the insert 23 thereby divides the cavity 7 into a pressure chamber 24 facing the pumping chambers and into a suction chamber 25 facing away from the pumping chambers 10.
  • the three bores 6 open into the pressure chamber 24 and thus form a connecting line 26 between each pump chamber 10 and the pressure chamber 24.
  • the bypass line 8 branches off from the pressure chamber 24.
  • a pressure line 27 emerges from the suction chamber 25, and an injector 28 is inserted into it in a sealed manner, the other end of which is sealed and inserted into a through opening 29 of the insert 23, so that the injector 28 passes through the suction chamber 25 in a sealed manner and a flow connection between the pressure chamber 24 and the pressure line 27.
  • the injector has a narrowing of the flow path, and in the area of this narrowing radial channels 30 connect the suction chamber 25 to the longitudinal channel 31 of the injector 28.
  • the injector 28 is fixed in the longitudinal direction in that it rests with its front edges against steps 32 or 33 in the pressure line 27 and in the insert 23.
  • a chemical suction line 34 also opens into the suction chamber 25 and a hose 35 of a chemical supply can be plugged onto it.
  • this chemical suction line 34 is closed by a spherical valve body 36 which is pressed against the inner end of the chemical suction line 34 by a helical spring 37.
  • the helical spring 37 is supported on the insert 23 within a sleeve 38.
  • the insert On its side facing the pumping chambers 10, the insert carries a pressure valve 39 for each bore 6. This comprises a ring-shaped valve seat 40, which is inserted into a stepped extension 41 of each bore 6 and is held by holding arms 42 on the insert 23 .
  • the annular valve seat 40 can, for example, be held in a clamped position between a plurality of holding arms 42.
  • the pressure valve each comprises a mushroom-shaped valve body 43, the shaft 44 of which is guided in a longitudinally displaceable manner in a guide 45 on the insert 23 and which is pressed with its plate 47 against the valve seat 40 by a coil spring 46 surrounding the guide 45.
  • the holding arms 42 are of different lengths in the different pressure valves, so that the pressure valves maintain the same distance relative to the pressure chambers 24 which are at different distances from the insert 23.
  • a control piston 50 is displaceable longitudinally and sealed via an annular seal 49, the upper side 51 of which is acted upon by the liquid in the suction chamber 25, the latter Bottom side 52, however, from the liquid in the pressure chamber 24.
  • the control piston 50 is connected via a shaft 53 to a valve body 54 which bears sealingly against a valve seat 55.
  • This valve seat 55 is sealing in the transition region between the pressure chamber 24 and the bypass line 8 used, it also serves as a support for a compression spring 56 which surrounds the shaft 53 and is supported on the underside 52 of the control piston 50.
  • the control piston 50 can be moved against the action of the Druckfe ⁇ the 56 so that the valve body 54 is lifted from the valve seat 55.
  • the valve seat 55 is fixed to the insert 23 via holding arms 57.
  • the insert 23 is preferably formed as a plastic part, and the injector 28, the valve seats 40, the valve body 43, the valve seat 55 and the valve body 54 are preferably made of plastic, the same also applies to the spherical valve body 36. It is advantageous here If the insert 23 is formed in one piece with the sleeve 38 and the holding arms 42 and 57, in a preferred exemplary embodiment even the one-piece design is also possible with the valve seats 40 and 55, although the valve seats 40 are better for assembly Licher are designed as separate parts to be fixed to the holding arms 42.
  • the overall assembly is thereby greatly simplified, although after the assembly the pump contains a large number of complicated small parts which can be moved to a considerable extent.
  • the liquid conveyed by the pistons 11 reaches the pressure chamber 24 via the pressure valves 39, from where the liquid exits through the injector 28 into the pressure line 27.
  • a negative pressure is generated on the channels 30, which on the one hand leads to a closure of the valve body 54 in the bypass line 8 and, if a certain negative pressure value is exceeded, also leads to chemical chemicals being sucked in through the chemical suction line 34. These sucked chemicals pass through the channels 30 into the pressure line 27 and mix with the pumped liquid.
  • a pipe socket 58 is formed, which is closed in the illustrated embodiment. After opening, a manometer, for example, can be connected to this pipe socket 58.

Landscapes

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

Abstract

Pour réduire l'encombrement, le poids et en particulier les temps de montage pour un appareil de nettoyage à haute pression comportant une pompe à piston avec un carter, dans lequel se trouve au moins une chambre de pompage débouchant par l'intermédiaire d'une soupape de sortie dans une chambre de pression se trouvant dans le carter, et comportant une conduite de refoulement sortant de cette dernière, avec un étranglement pour la création d'une différence de pression en fonction du flux en amont ou en aval de l'étranglement, il est proposé d'avoir dans le carter une cavité communiquant directement avec la chambre de pompage, ladite cavité étant pourvu d'un insert étanche qui la divise en une chambre de pression dirigée vers la chambre de pompage et en une chambre d'aspiration, et de relier la chambre d'aspiration, en aval de l'étranglement, à la conduite de refoulement.
EP92904614A 1991-03-05 1992-02-14 Appareil de nettoyage a haute pression Expired - Lifetime EP0574420B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4106956 1991-03-05
DE4106956 1991-03-05
PCT/EP1992/000325 WO1992015783A2 (fr) 1991-03-05 1992-02-14 Appareil de nettoyage a haute pression

Publications (2)

Publication Number Publication Date
EP0574420A1 true EP0574420A1 (fr) 1993-12-22
EP0574420B1 EP0574420B1 (fr) 1995-04-26

Family

ID=6426493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92904614A Expired - Lifetime EP0574420B1 (fr) 1991-03-05 1992-02-14 Appareil de nettoyage a haute pression

Country Status (4)

Country Link
EP (1) EP0574420B1 (fr)
DE (1) DE59202039D1 (fr)
DK (1) DK0574420T3 (fr)
WO (1) WO1992015783A2 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758135A (en) * 1986-12-30 1988-07-19 Weatherford U.S., Inc. Pump head
DE4001418A1 (de) * 1990-01-19 1991-07-25 Buchen Smb Gmbh Hochdruckpumpe fuer hochdruckwasserstrahlmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9215783A2 *

Also Published As

Publication number Publication date
DK0574420T3 (da) 1995-07-03
WO1992015783A2 (fr) 1992-09-17
WO1992015783A3 (fr) 1992-10-29
DE59202039D1 (de) 1995-06-01
EP0574420B1 (fr) 1995-04-26

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