EP0574420B1 - High-pressure cleaning device - Google Patents

High-pressure cleaning device Download PDF

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Publication number
EP0574420B1
EP0574420B1 EP92904614A EP92904614A EP0574420B1 EP 0574420 B1 EP0574420 B1 EP 0574420B1 EP 92904614 A EP92904614 A EP 92904614A EP 92904614 A EP92904614 A EP 92904614A EP 0574420 B1 EP0574420 B1 EP 0574420B1
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EP
European Patent Office
Prior art keywords
pressure
cleaning device
chamber
insert
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.)
Expired - Lifetime
Application number
EP92904614A
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German (de)
French (fr)
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EP0574420A1 (en
Inventor
Robert Nathan
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Alfred Kaercher SE and Co KG
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Alfred Kaercher SE and Co KG
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Publication of EP0574420A1 publication Critical patent/EP0574420A1/en
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    • 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 pump 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 producing a flow-dependent pressure difference upstream or downstream the narrowing.
  • High-pressure cleaning devices of this type are known, in 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.
  • a cavity is arranged in the housing which is directly connected to the pumping chamber and in which an insert is inserted in a sealed manner and divides the cavity into the pressure chamber facing the pumping chamber and into a suction chamber, and that the suction chamber is connected to the pressure line downstream of the constriction.
  • the housing which is 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 on 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 into 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 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 is connected to the suction chamber via at least one opening stands.
  • 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 consists of plastic.
  • Such an insert is easier to manufacture than a die-cast part with a complicated structure, and moreover such a part can generally be produced with thinner walls and therefore has a lower weight due to the lighter material and the thinner wall thicknesses.
  • a preferred embodiment is obtained if the housing is divided at the level of the insert and an annular seal which rests on the insert and on the two housing parts is arranged in this area.
  • 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 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 is inserted in a sealed manner in a connection between the pump chamber and the pressure chamber.
  • valve seat of the exhaust 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 pumping chamber and the pressure chamber and is held on holding arms of the insert. This facilitates the assembly of the exhaust 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 pumping 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; it can also be inserted into the bypass line in a sealed manner, which means that assembly is also facilitated in this case, since the closing valve is immediately positioned in the bypass line when the insert is inserted.
  • This control piston is actuated by the differential pressure in the pressure chamber and in the suction chamber so 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 is closed on the outlet side.
  • a particularly space-saving construction of the pump housing is obtained if all of the pumping chambers are in the housing Connection lines leading pressure chamber and possibly the bypass line are arranged in a plane next to one another and parallel to one another.
  • 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 into the one Casing.
  • the described configuration not only simplifies the construction of the pump housing and reduces the weight and size, but it also results in considerable advantages when assembling such a pump, since complicated moving parts of the pump are preassembled on the insert outside the housing and then as a structural unit can be inserted into the housing.
  • 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 both 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 to a cavity 7 arranged in the region of the fastening flange 3, in addition to the bores 6 there is a bypass line 8 leading from the cavity 7 to the cavity 4 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-dotted lines in FIG. 1, they are driven to oscillate 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 which is not shown in the drawing and which lies against the end faces of the pistons 11.
  • 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 slightly conical widening in the flow direction, so that the suction valve 12 bears against an annular shoulder 18 in the bore 6 (FIG. 2).
  • a cover 19 is placed, which is attached to the mounting flange 3 and closes the cavity 7 of the housing 1. Part of this cavity 7 is located in the cover 19.
  • a bevelled triangular circumferential groove 21 is formed by chamfers on the housing 1 and the cover 19, in which an annular seal 22 is inserted. This is pressed into the circumferential groove 21 by an insert 23 inserted into the cavity 7, the ring seal 22 sealingly abutting the insert 23 over its entire length.
  • 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 piece 27a emerges from the suction chamber 25, and an injector 28 is inserted 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 seals through the suction chamber 25 and establishes a flow connection between the two Pressure chamber 24 and the pressure line piece 27a, this flow connection forms a pressure line 27.
  • the injector has a narrowing of the flow path, and downstream 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 its front edges rest against steps 32 and 33 in the pressure line piece 27a and in the insert 23, respectively.
  • 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. Inside the suction chamber 25, this chemical suction line 34 is closed by a spherical valve body 36, which is pressed by a helical spring 37 against the inner end of the chemical suction line 34.
  • 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 the clamp seat 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 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 in a longitudinally displaceable manner and sealed by means of an annular seal 49, the upper side 51 of which is acted upon by the liquid in the suction chamber 25, the lower side 52 of which 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 on 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 compression spring 56 so that the valve body 54 is lifted off the valve seat 55.
  • the valve seat 55 is fixed on the insert 23 via holding arms 57.
  • the insert 23 is preferably designed 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 if the insert 23 is formed in one piece with the sleeve 38 and the holding arms 42 and 57; in a preferred embodiment, even the one-piece design is also possible with the valve seats 40 and 55, although for better assembly the valve seats 40 are usually separate on the holding arms 42 parts to be determined are formed.
  • the overall assembly is extremely simplified, although the pump contains a number of complicated small parts after assembly, which are largely movable.
  • 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 suction through the chemical suction line 34.
  • These sucked chemicals enter via the channels 30 the pressure line 27 and mix with the pumped liquid.
  • the pressure in the suction chamber 25 rises to the maximum value, on the one hand this causes the valve body 36 to close the chemical suction line 34, and on the other hand the control piston 50 is displaced so that the valve body 54 is lifted off the valve seat 55 and the bypass line 8 is released.
  • the opening against the action of the compression spring 56 occurs in that the effective area of the control piston on the underside 52 is less than on the top 51.
  • a pipe socket 58 is formed, which is closed in the illustrated embodiment.
  • a pressure gauge for example, can be connected to this pipe socket 58 after opening.

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

Abstract

The invention concerns a high-pressure cleaning device with a piston pump with a housing in which is located at least one pump chamber which is connected via an outlet valve to a pressure chamber also located in the housing. The cleaning device also has a pressure line which emerge from the pressure chamber, the pressure line having a constriction designed to produce a flow-dependant pressure difference between each side of the constriction. In order to reduce the size and weight of a cleaning device of this kind and, in particular, to reduce the time necessary to assemble the device, the invention proposes that a cavity connected directly to the pump chamber be located in the housing, a sealed insert being fitted in the cavity to divide it into the pressure chamber on the pump chamber side and an aspiration chamber, the aspiration chamber being connected to the pressure line downstream of the constriction.

Description

Die Erfindung betrifft ein Hochdruckreinigungsgerät mit einer Kolbenpumpe mit einem Gehäuse, in dem sich mindestens eine Pumpkammer befindet, die über ein Auslaßventil in eine im Gehäuse angeordnete Druckkammer einmündet, und mit einer aus dieser austretenden Druckleitung mit einer Verengung zur Erzeugung eines strömungsabhängigen Druckunterschiedes stromaufwärts beziehungsweise stromabwärts der Verengung.The invention relates to a high-pressure cleaning device with a piston pump with a housing in which there is at least one pump 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 producing a flow-dependent pressure difference upstream or downstream the narrowing.

Hochdruckreinigungsgeräte dieser Art sind bekannt, bei denen stromabwärts der Verengung in der Druckleitung eine Zweigleitung austritt, die wahlweise als Chemikalienansaugleitung oder als Steuerleitung für ein Schließventil einer Bypass-Leitung Verwendung findet. Der konstruktive Aufwand bei bekannten Hochdruckreinigungsgeräten dieser Art ist relativ groß, da zwischen der Druckleitung und den einzelnen Gehäuseabschnitten getrennte Steuerleitungen notwendig sind und da auch die Gehäuse durch die verschiedenen Gehäuseabschnitte eine sehr komplizierte Form erhalten.High-pressure cleaning devices of this type are known, in 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.

Es ist Aufgabe der Erfindung, ein gattungsgemäßes Hochdruckreinigungsgerät so auszubilden, daß ein besonders einfacher Aufbau erreicht wird und daß insbesondere die Abmessungen und das Gewicht des Pumpenaggregates herabgesetzt werden können.It is an object of the invention to design a generic high-pressure cleaning device so that a particularly simple structure is achieved and that in particular the dimensions and the weight of the pump unit can be reduced.

Diese Aufgabe wird bei einem Hochdruckreinigungsgerät der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß im Gehäuse ein unmittelbar mit der Pumpkammer verbundener Hohlraum angeordnet ist, in den abgedichtet ein Einsatz eingesetzt ist, der den Hohlraum in die der Pumpkammer zugewandte Druckkammer und in eine Ansaugkammer unterteilt, und daß die Ansaugkammer stromabwärts der Verengung mit der Druckleitung verbunden ist.This object is achieved according to the invention in a high-pressure cleaning device of the type described in the introduction in that a cavity is arranged in the housing which is directly connected to the pumping chamber and in which an insert is inserted in a sealed manner and divides the cavity into the pressure chamber facing the pumping chamber and into a suction chamber, and that the suction chamber is connected to the pressure line downstream of the constriction.

Durch diesen sehr vereinfachten Aufbau kann das üblicherweise als Druckgußwerkstück hergestellte Gehäuse sehr einfach ausgebildet sein. Es genügt nämlich, an der Auslaßseite der Pumpkammern einen einzigen Hohlraum in dem Gehäuse vorzusehen und in diesen Hohlraum einen Einsatz abgedichtet einzuschieben, der den Hohlraum in die Druckkammer und in eine Ansaugkammer unterteilt. Die Ansaugkammer kann zur Chemikalienansaugung und zur Steuerung einer Bypass-Leitung Verwendung finden, dazu sind an dem Gehäuse keine zusätzlichen komplizierten Ausgestaltungen notwendig.Due to this very simplified construction, the housing, which is 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 on 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 into 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.

Bei einer ersten bevorzugten Ausführungsform mündet in die Ansaugkammer eine Chemikalienansaugleitung ein. Durch den in der Druckleitung erzeugten Unterdruck wird die Chemikalie über die Chemikalienansaugleitung in die Ansaugkammer angesaugt, diese Chemikalie gelangt über die Verbindung mit der Druckleitung in die durch die Druckleitung geförderte Flüssigkeit. Eine spezielle, in die Druckleitung einmündende Chemikalienansaugleitung ist daher nicht mehr notwendig.In a first preferred embodiment, a chemical suction line opens into the suction chamber. Due to the negative pressure generated in the pressure line, the chemical 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.

Günstig ist es, wenn die Chemikalienansaugleitung mit einem in Einströmrichtung öffenbaren Rückschlagventil verschlossen ist, das gegebenenfalls federbelastet sein kann. Auf diese Weise ergibt sich eine Chemikalienansaugung erst, wenn der Druckabfall an der Verengung einen bestimmten Wert überschreitet.It is expedient if 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.

Eine besonders platzsparende und vereinfachte Konstruktion ergibt sich, wenn das Rückschlagventil für die Chemikalienansaugleitung am Einsatz gelagert ist. Dies begünstigt die einfache Ausgestaltung des Pumpengehäuses.A particularly space-saving and simplified construction results if the check valve for the chemical suction line is mounted on the insert. This favors the simple design of the pump housing.

Bei einem weiteren bevorzugten Ausführungsbeispiel ist vorgesehen, daß ein Injektor die Ansaugkammer abgedichtet durchsetzt, der mit der Druckkammer einerseits und der aus dem Gehäuse austretenden Druckleitung andererseits in Strömungsverbindung steht und somit einen Teil der Druckleitung bildet und der über mindestens eine Öffnung mit der Ansaugkammer in Verbindung steht.In a further preferred exemplary embodiment it is provided that 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 is connected to the suction chamber via at least one opening stands.

Dabei ist es vorteilhaft, wenn der Injektor am Einsatz gehalten ist. Auch dadurch wird die Struktur des Pumpengehäuses vereinfacht.It is advantageous if the injector is kept on the insert. This also simplifies the structure of the pump housing.

Der Injektor kann beispielsweise abgedichtet in eine den Einsatz durchgreifende Öffnung eingesetzt sein.The injector can be inserted, for example, in a sealed manner into an opening that extends through the insert.

Der Injektor kann aus Kunststoff bestehen.The injector can be made of plastic.

Im Rahmen der Erfindung hat es sich als besonders vorteilhaft herausgestellt, wenn der Einsatz aus Kunststoff besteht. Ein solcher Einsatz ist leichter herzustellen als ein Druckgußteil mit komplizierter Struktur, außerdem kann ein solches Teil in der Regel mit dünneren Wänden hergestellt werden und weist daher aufgrund des leichteren Materials und der dünneren Wandstärken ein geringeres Gewicht auf.In the context of the invention, it has proven to be particularly advantageous if the insert consists of plastic. Such an insert is easier to manufacture than a die-cast part with a complicated structure, and moreover such a part can generally be produced with thinner walls and therefore has a lower weight due to the lighter material and the thinner wall thicknesses.

Eine bevorzugte Ausgestaltung ergibt sich, wenn das Gehäuse in Höhe des Einsatzes geteilt ist und in diesem Bereich eine am Einsatz und an den beiden Gehäuseteilen anliegende Ringdichtung angeordnet ist. Diese Ringdichtung übernimmt dabei eine doppelte Aufgabe, nämlich einmal die Abdichtung der beiden Gehäuseteile gegeneinander und zum anderen die Abdichtung des Einsatzes gegenüber dem Gehäuse. Durch diese Konstruktion befindet sich nur ein Gehäuseteil in Kontakt mit gegebenenfalls angesaugter Chemikalie, das andere Gehäuseteil gelangt aufgrund dieser Ausgestaltung mit der Chemikalienansaugung überhaupt nicht in Berührung. Es genügt daher, wenn das mit der Chemikalie in Kontakt tretende Gehäuseteil chemikalienresistent ausgebildet ist, beispielsweise durch Wahl eines geeigneten, hochwertigeren Materials oder durch eine Kunststoffbeschichtung. Das übrige Gehäuseteil jedoch, welches die Pumpkammern und die Druckkammer aufnimmt, kann in herkömmlicher Weise aus weniger resistentem Material hergestellt werden, da dieses Gehäuseteil nur mit der reinen Flüssigkeit in Berührung kommt.A preferred embodiment is obtained if the housing is divided at the level of the insert and an annular seal which rests on the insert and on the two housing parts is arranged in this area. 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. As a result of this construction, only one housing part is in contact with any chemical that has been sucked in; the other housing part does not come into contact with the chemical suction at all due to this configuration. It is therefore sufficient if 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 chamber can be made in a conventional manner from less resistant material, since this housing part only comes into contact with the pure liquid.

Eine weitere günstige Ausgestaltung ist dadurch gekennzeichnet, daß der Einsatz für jede Pumpkammer ein Auslaßventil trägt, welches abgedichtet in eine Verbindung zwischen Pumpkammer und Druckkammer eingesetzt ist. Dadurch ist es auch nicht mehr notwendig, in das Gehäuse selbst Auslaßventile einzusetzen, diese werden am Einsatz gehalten; dadurch vereinfacht sich der Aufbau des Gehäuses.A further advantageous embodiment is characterized in that the insert carries an outlet valve for each pump chamber, which is inserted in a sealed manner in a connection between the pump chamber and the pressure chamber. As a result, it is no longer necessary to insert exhaust valves into the housing itself, these are kept in place; this simplifies the construction of the housing.

Besonders günstig ist es, wenn der Ventilsitz des Auslaßventils einstückig an den Einsatz angeformt ist.It is particularly favorable if the valve seat of the exhaust valve is integrally formed on the insert.

Bei einer anderen Ausgestaltung kann vorgesehen sein, daß der Ventilsitz des Auslaßventils als abgedichtet in der Verbindungsleitung zwischen Pumpkammer und Druckkammer einsetzbarer Kunststoffring ausgebildet ist, der an Haltearmen des Einsatzes gehalten ist. Dies erleichtert den Zusammenbau des Auslaßventils und insbesondere den Einsatz des Ventilkörpers.In another embodiment, it can be provided that the valve seat of the outlet valve is designed as a plastic ring which can be inserted in the connecting line between the pumping chamber and the pressure chamber and is held on holding arms of the insert. This facilitates the assembly of the exhaust valve and in particular the use of the valve body.

Dieser Ventilkörper des Auslaßventils besteht vorzugsweise ebenfalls aus Kunststoff.This valve body of the exhaust valve is preferably also made of plastic.

Vorteilhaft ist es, wenn die Auslaßventile am Einsatz über gegebenenfalls unterschiedlich lange Haltearme so gehalten sind, daß ihr Abstand von allen Pumpkammern gleich ist. Dadurch wird gewährleistet, daß das Pumpvolumen aller Pumpkammern gleich ist, trotzdem kann mit dem Einsetzen eines Einsatzes für alle Pumpkammern gleichzeitig die Ausrüstung mit Auslaßventilen vorgenommen werden.It is advantageous if the 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 pumping 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.

Bei einer besonders bevorzugten Ausführungsform führt vom Druckraum im Gehäuse eine Bypass-Leitung zur Saugseite der Pumpkammern, wobei am Einsatz ein die Bypass-Leitung gegenüber der Druckkammer verschließendes Schließventil gehalten ist.In a particularly preferred embodiment, 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.

Dabei kann der Ventilsitz des Schließventils einstückig mit dem Einsatz ausgebildet sein; außerdem kann er abgedichtet in die Bypass-Leitung eingeschoben sein, das heißt der Zusammenbau wird auch in diesem Fall erleichtert, da mit dem Einschieben des Einsatzes sofort auch das Schließventil in der Bypass-Leitung positioniert ist.The valve seat of the closing valve can be formed in one piece with the insert; it can also be inserted into the bypass line in a sealed manner, which means that assembly is also facilitated in this case, since the closing valve is immediately positioned in the bypass line when the insert is inserted.

Es kann weiterhin vorgesehen sein, daß in einer die Druckkammer mit der Ansaugkammer verbindenden Öffnung des Einsatzes abgedichtet und verschieblich ein Steuerkolben gelagert ist, der mit dem Ventilkörper des Schließventils verbunden ist. Dieser Steuerkolben wird vom Differenzdruck in der Druckkammer und in der Ansaugkammer so betätigt, daß er das Schließventil öffnet, sobald der Druck in der Ansaugkammer einen bestimmten Wert übersteigt, wie dies beispielsweise dann der Fall ist, wenn die Druckleitung auslaßseitig verschlossen ist.Provision can furthermore be made for a control piston, which is connected to the valve body of the closing valve, to be sealed and slidably mounted in an opening in the insert connecting the pressure chamber to the suction chamber. This control piston is actuated by the differential pressure in the pressure chamber and in the suction chamber so 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 is closed on the outlet side.

Ein besonders platzsparender Aufbau des Pumpengehäuses ergibt sich, wenn im Gehäuse alle von den Pumpkammern zur Druckkammer führenden Verbindungsleitungen und gegebenenfalls die Bypass-Leitung in einer Ebene nebeneinander und parallel zueinander angeordnet sind. Das Pumpengehäuse kann dabei sehr flach ausgebildet sein, außerdem ermöglicht es diese Anordnung, mit einem Einsatz sowohl das Schließventil für die Bypass-Leitung mit dem zugehörigen Steuerkolben als auch die Schließventile für alle Pumpkammern in einem Arbeitsgang einzusetzen, nämlich einfach durch Einschieben des Einsatzes in das Gehäuse.A particularly space-saving construction of the pump housing is obtained if all of the pumping chambers are in the housing Connection lines leading pressure chamber and possibly the bypass line are arranged in a plane next to one another and parallel to one another. 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 into the one Casing.

Durch die beschriebene Ausgestaltung wird insgesamt nicht nur der Aufbau des Pumpengehäuses vereinfacht und das Gewicht und die Baugröße herabgesetzt, sondern es ergeben sich auch erhebliche Vorteile beim Zusammenbau einer solchen Pumpe, da komplizierte bewegliche Teile der Pumpe am Einsatz außerhalb des Gehäuses vormontiert und dann als Baueinheit in das Gehäuse eingesetzt werden können.The described configuration not only simplifies the construction of the pump housing and reduces the weight and size, but it also results in considerable advantages when assembling such a pump, since complicated moving parts of the pump are preassembled on the insert outside the housing and then as a structural unit can be inserted into the housing.

Die nachfolgende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

Figur 1 :
eine perspektivische Explosionsdarstellung des geöffneten Pumpengehäuses mit Einsatz und
Figur 2 :
eine Schnittansicht des zusammengesetzten Pumpengehäuses längs Linie 2-2 in Figur 1.
The following description of preferred embodiments of the invention serves in conjunction with the drawing for a more detailed explanation. Show it:
Figure 1:
a perspective exploded view of the open pump housing with insert and
Figure 2:
2 shows a sectional view of the assembled pump housing along line 2-2 in FIG. 1.

Die in der Zeichnung dargestellte Hochdruckpumpe umfaßt ein Gehäuse 1 in Form einer Platte, das an beiden einander gegenüberliegenden Stirnkanten je einen aus der Plattenebene abstehenden Befestigungsflansch 2, 3 aufweist. Im Bereich des Befestigungsflansches 2 befindet sich ein nach außen hin offener Hohlraum 4, in den eine Flüssigkeitszufuhrleitung 5 einmündet. Von diesem Hohlraum 4 führen drei parallele Bohrungen 6 durch das plattenförmige Gehäuse 1 hindurch bis zu einem im Bereich des Befestigungsflansches 3 angeordneten Hohlraum 7, neben den Bohrungen 6 befindet sich eine vom Hohlraum 7 bis zum Hohlraum 4 führende Bypass-Leitung 8 im Gehäuse 1, die ebenfalls parallel zu den Bohrungen 6 verläuft.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 both opposite end edges. In the area of the mounting flange 2 there is a cavity 4 which is open to the outside and into which a liquid supply line 5 opens. From this cavity 4, three parallel bores 6 lead through the plate-shaped housing 1 to a cavity 7 arranged in the region of the fastening flange 3, in addition to the bores 6 there is a bypass line 8 leading from the cavity 7 to the cavity 4 in the housing 1, which also runs parallel to the holes 6.

Von der Oberseite her sind drei stufige Sacklochbohrungen 9 in das Gehäuse 1 eingebracht, deren Mittelpunkte sich auf den Eckpunkten eines gleichseitigen Dreiecks befinden. Jede dieser Sacklochbohrungen 9 steht mit jeweils einer der Bohrungen 6 in Verbindung, die die Sacklochbohrung 9 durchsetzen. Jede Sacklochbohrung 9 bildet eine Pumpkammer 10, in die abgedichtet jeweils ein Kolben 11 eintaucht. Die Kolben 11 sind in der Figur 1 strichpunktiert eingezeichnet, sie werden parallel zu ihrer Längsachse oszillierend angetrieben und tauchen dabei mehr oder weniger tief in die Sacklochbohrungen 9 ein. Der Antrieb kann beispielsweise über eine in der Zeichnung nicht dargestellte, an den Stirnseiten der Kolben 11 anliegende Taumelscheibe erfolgen.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-dotted lines in FIG. 1, they are driven to oscillate 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 which is not shown in the drawing and which lies against the end faces of the pistons 11.

In die Bohrungen 6 ist auf der dem Hohlraum 4 zugewandten Seite jeweils ein Saugventil 12 abgedichtet eingesetzt, diese Saugventile 12 können dabei als selbständige Einsätze mit einem Ventilsitz 13 und einem Ventilkörper 14 ausgebildet sein, in denen der Ventilkörper 14 mittels einer Feder 15 gegen den Ventilsitz 13 gedrückt wird. Die Abdichtung gegenüber der Bohrung 6 erfolgt über eine O-Ringdichtung 16, die in eine Umfangsnut 17 des Saugventils 12 eingelegt ist.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.

Zur Aufnahme des Saugventils 12 kann die Bohrung 6 eine in Strömungsrichtung leicht konisch zusammenlaufende Erweiterung aufweisen, so daß das Saugventil 12 gegen eine Ringschulter 18 in der Bohrung 6 anliegt (Figur 2).To accommodate the suction valve 12, the bore 6 can have a slightly conical widening in the flow direction, so that the suction valve 12 bears against an annular shoulder 18 in the bore 6 (FIG. 2).

Auf das Gehäuse 1 ist ein Deckel 19 aufgesetzt, der am Befestigungsflansch 3 befestigt ist und den Hohlraum 7 des Gehäuses 1 abschließt. Dabei befindet sich ein Teil dieses Hohlraumes 7 in dem Deckel 19.On the housing 1, a cover 19 is placed, which is attached to the mounting flange 3 and closes the cavity 7 of the housing 1. Part of this cavity 7 is located in the cover 19.

Längs der Trennungsfläche 20 zwischen Gehäuse 1 und Deckel 19 wird durch Abschrägungen am Gehäuse 1 und am Deckel 19 eine im Querschnitt dreieckförmige Umfangsnut 21 ausgebildet, in die eine Ringdichtung 22 eingelegt ist. Diese wird durch einen in den Hohlraum 7 eingeschobenen Einsatz 23 in die Umfangsnut 21 eingedrückt, wobei die Ringdichtung 22 über ihre gesamte Länge dichtend am Einsatz 23 anliegt.Along the separating surface 20 between the housing 1 and the cover 19, a bevelled triangular circumferential groove 21 is formed by chamfers on the housing 1 and the cover 19, in which an annular seal 22 is inserted. This is pressed into the circumferential groove 21 by an insert 23 inserted into the cavity 7, the ring seal 22 sealingly abutting the insert 23 over its entire length.

Der Einsatz 23 unterteilt dadurch den Hohlraum 7 in eine den Pumpkammern zugewandte Druckkammer 24 und in eine den Pumpkammern 10 abgewandte Ansaugkammer 25.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.

In die Druckkammer 24 münden die drei Bohrungen 6 ein, die somit eine Verbindungsleitung 26 zwischen jeder Pumpkammer 10 und der Druckkammer 24 ausbilden. Außerdem zweigt aus der Druckkammer 24 die Bypass-Leitung 8 ab.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. In addition, the bypass line 8 branches off from the pressure chamber 24.

Aus der Ansaugkammer 25 tritt ein Druckleitungsstück 27a aus, in dieses ist abgedichtet ein Injektor 28 eingesteckt, der mit seinem anderen Ende abgedichtet in eine Durchgangsöffnung 29 des Einsatzes 23 eingesteckt ist, so daß der Injektor 28 abgedichtet die Ansaugkammer 25 durchsetzt und eine Strömungsverbindung zwischen der Druckkammer 24 und dem Druckleitungsstück 27a herstellt, diese Strömungsverbindung bildet eine Druckleitung 27. Der Injektor weist eine Verengung des Strömungsweges auf, und Stromabwärts dieser Verengung verbinden radiale Kanäle 30 die Ansaugkammer 25 mit dem Längskanal 31 des Injektors 28.A pressure line piece 27a emerges from the suction chamber 25, and an injector 28 is inserted 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 seals through the suction chamber 25 and establishes a flow connection between the two Pressure chamber 24 and the pressure line piece 27a, this flow connection forms a pressure line 27. The injector has a narrowing of the flow path, and downstream of this narrowing, radial channels 30 connect the suction chamber 25 to the longitudinal channel 31 of the injector 28.

Der Injektor 28 wird in Längsrichtung dadurch fixiert, daß er mit seinen Stirnkanten jeweils an Stufen 32 beziehungsweise 33 in dem Druckleitungsstück 27a und im Einsatz 23 anliegt.The injector 28 is fixed in the longitudinal direction in that its front edges rest against steps 32 and 33 in the pressure line piece 27a and in the insert 23, respectively.

In die Ansaugkammer 25 mündet außerdem eine Chemikalienansaugleitung 34 ein, auf die ein Schlauch 35 eines Chemikalienvorrats aufgesteckt werden kann. Im Inneren der Ansaugkammer 25 wird diese Chemikalienansaugleitung 34 durch einen kugelförmigen Ventilkörper 36 verschlossen, der durch eine Schraubenfeder 37 gegen das innere Ende der Chemikalienansaugleitung 34 gedrückt wird. Die Schraubenfeder 37 stützt sich dabei innerhalb einer Hülse 38 am Einsatz 23 ab.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. Inside the suction chamber 25, this chemical suction line 34 is closed by a spherical valve body 36, which is pressed by a helical spring 37 against the inner end of the chemical suction line 34. The helical spring 37 is supported on the insert 23 within a sleeve 38.

Auf seiner den Pumpkammern 10 zugewandten Seite trägt der Einsatz für jede Bohrung 6 ein Druckventil 39. Dieses umfaßt einen ringförmigen Ventilsitz 40, der abgedichtet in eine stufenförmige Erweiterung 41 jeder Bohrung 6 eingesetzt ist und von Haltearmen 42 am Einsatz 23 gehalten ist. Der ringförmige Ventilsitz 40 kann beispielsweise zwischen mehreren Haltearmen 42 im Klemmsitz gehalten sein. Außerdem umfaßt das Druckventil jeweils einen pilzförmigen Ventilkörper 43, dessen Schaft 44 in einer Führung 45 am Einsatz 23 längsverschieblich geführt ist und der durch eine die Führung 45 umgebende Schraubenfeder 46 mit seinem Teller 47 gegen den Ventilsitz 40 gedrückt wird.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 the clamp seat between a plurality of holding arms 42. In addition, 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 is pressed with its plate 47 against the valve seat 40 by a coil spring 46 surrounding the guide 45.

Die Haltearme 42 sind bei den verschiedenen Druckventilen unterschiedlich lang ausgebildet, so daß die Druckventile relativ zu den verschieden weit vom Einsatz 23 entfernten Druckkammern 24 jeweils denselben Abstand einhalten.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.

In einer Durchgangsöffnung 48 des Einsatzes 23, die sich in der Verlängerung der Bypass-Leitung 8 befindet, ist längsverschieblich und über eine Ringdichtung 49 abgedichtet ein Steuerkolben 50 verschieblich gelagert, dessen Oberseite 51 von der Flüssigkeit in der Ansaugkammer 25 beaufschlagt wird, dessen Unterseite 52 dagegen von der Flüssigkeit in der Druckkammer 24.In a through opening 48 of the insert 23, which is located in the extension of the bypass line 8, a control piston 50 is displaceable in a longitudinally displaceable manner and sealed by means of an annular seal 49, the upper side 51 of which is acted upon by the liquid in the suction chamber 25, the lower side 52 of which the liquid in the pressure chamber 24.

Der Steuerkolben 50 ist über einen Schaft 53 mit einem Ventilkörper 54 verbunden, der dichtend an einem Ventilsitz 55 anliegt. Dieser Ventilsitz 55 ist im Übergangsbereich zwischen Druckkammer 24 und Bypass-Leitung 8 dichtend in diese eingesetzt, er dient außerdem als Abstützung für eine Druckfeder 56, die den Schaft 53 umgibt und sich an der Unterseite 52 des Steuerkolbens 50 abstützt. Dadurch wird der Steuerkolben 50 normalerweise in die Schließstellung verschoben, in der die Bypass-Leitung 8 gegenüber der Ansaugkammer 25 verschlossen ist.The control piston 50 is connected via a shaft 53 to a valve body 54 which bears sealingly on 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. As a result, the control piston 50 is normally moved into the closed position, in which the bypass line 8 is closed with respect to the suction chamber 25.

Der Steuerkolben 50 kann entgegen der Wirkung der Druckfeder 56 so verschoben werden, daß der Ventilkörper 54 vom Ventilsitz 55 abgehoben wird.The control piston 50 can be moved against the action of the compression spring 56 so that the valve body 54 is lifted off the valve seat 55.

Der Ventilsitz 55 ist über Haltearme 57 am Einsatz 23 festgelegt.The valve seat 55 is fixed on the insert 23 via holding arms 57.

Der Einsatz 23 ist vorzugsweise als Kunststoffteil ausgebildet, ebenso werden der Injektor 28, die Ventilsitze 40, die Ventilkörper 43, der Ventilsitz 55 und der Ventilkörper 54 vorzugsweise aus Kunststoff hergestellt, dasselbe gilt auch hinsichtlich des kugelförmigen Ventilkörpers 36. Dabei ist es günstig, wenn der Einsatz 23 einstückig mit der Hülse 38 sowie den Haltearmen 42 und 57 ausgebildet ist, in einem bevorzugten Ausführungsbeispiel ist sogar die einstückige Ausbildung auch mit den Ventilsitzen 40 und 55 möglich, obwohl zur besseren Montage die Ventilsitze 40 üblicherweise als separate, an den Haltearmen 42 festzulegende Teile ausgebildet sind.The insert 23 is preferably designed 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 if the insert 23 is formed in one piece with the sleeve 38 and the holding arms 42 and 57; in a preferred embodiment, even the one-piece design is also possible with the valve seats 40 and 55, although for better assembly the valve seats 40 are usually separate on the holding arms 42 parts to be determined are formed.

Man erhält auf diese Weise eine Baueinheit, die aufgrund der parallelen Ausrichtung der Bohrungen 6 und der Bypass-Leitung 8 bei abgenommenen Deckel 19 von der offenen Seite her in den Hohlraum 7 eingeschoben werden kann, wobei automatisch Abdichtungen der Ventilsitze 40 gegenüber den Bohrungen 6, des Ventilsitzes 55 gegenüber der Bypass-Leitung 8 und des Einsatzes 23 gegenüber dem Gehäuse 1 erfolgen, und zwar durch entsprechende Ringdichtungen. Am Einsatz 23 sind die kompletten Druckventile 39 und das komplette Schließventil der Bypass-Leitung gehalten, so daß zur Vervollständigung der druckseitigen Montage des Pumpengehäuses nur noch die Schraubenfeder 37 und der Ventilkörper 36 sowie der Injektor 28 auf den Einsatz aufgesetzt werden müssen, dann kann das Gehäuse durch den Deckel 19 verschlossen werden.In this way, a structural unit is obtained which, due to the parallel alignment of the bores 6 and the bypass line 8, with the cover 19 removed, from the open side forth can be inserted into the cavity 7, with automatic sealing of the valve seats 40 with respect to the bores 6, the valve seat 55 with respect to the bypass line 8 and the insert 23 with respect to the housing 1, by means of appropriate ring seals. The complete pressure valves 39 and the complete closing valve of the bypass line are held on the insert 23, so that only the coil spring 37 and the valve body 36 and the injector 28 have to be placed on the insert to complete the pressure-side assembly of the pump housing, then this can be done Housing are closed by the cover 19.

Die Gesamtmontage wird dadurch außerordentlich vereinfacht, obwohl die Pumpe nach dem Zusammenbau eine Vielzahl komplizierter Kleinteile enthält, die zu einem erheblichen Teil beweglich sind.The overall assembly is extremely simplified, although the pump contains a number of complicated small parts after assembly, which are largely movable.

Im Betrieb gelangt die von den Kolben 11 geförderte Flüssigkeit über die Druckventile 39 in die Druckkammer 24, von dort tritt die Flüssigkeit durch den Injektor 28 hindurch in die Druckleitung 27 aus. Dabei wird an den Kanälen 30 ein Unterdruck erzeugt, der einerseits zu einer Schließung des Ventilkörpers 54 in der Bypass-Leitung 8 führt und bei Überschreiten eines bestimmten Unterdruckwertes außerdem zum Ansaugen von Chemikalie durch die Chemikalienansaugleitung 34. Diese angesaugten Chemikalien gelangen über die Kanäle 30 in die Druckleitung 27 und vermischen sich mit der geförderten Flüssigkeit.In operation, 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. In this case, 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 suction through the chemical suction line 34. These sucked chemicals enter via the channels 30 the pressure line 27 and mix with the pumped liquid.

Wird die Druckleitung verschlossen, steigt der Druck in der Ansaugkammer 25 auf den Maximalwert an, dadurch verschließt einerseits der Ventilkörper 36 die Chemikalienansaugleitung 34, zum anderen verschiebt sich dadurch der Steuerkolben 50 so, daß der Ventilkörper 54 vom Ventilsitz 55 abgehoben und die Bypass-Leitung 8 freigegeben wird. Die Öffnung gegen die Wirkung der Druckfeder 56 tritt dadurch ein, daß die wirksam beaufschlagte Fläche des Steuerkolbens an der Unterseite 52 geringer ist als an der Oberseite 51.If the pressure line is closed, the pressure in the suction chamber 25 rises to the maximum value, on the one hand this causes the valve body 36 to close the chemical suction line 34, and on the other hand the control piston 50 is displaced so that the valve body 54 is lifted off the valve seat 55 and the bypass line 8 is released. The opening against the action of the compression spring 56 occurs in that the effective area of the control piston on the underside 52 is less than on the top 51.

An den Deckel 19 ist ein Rohrstutzen 58 angeformt, der im dargestellten Ausführungsbeispiel verschlossen ist. An diesen Rohrstutzen 58 kann nach Öffnung beispielsweise ein Manometer angeschlossen werden.On the cover 19, a pipe socket 58 is formed, which is closed in the illustrated embodiment. A pressure gauge, for example, can be connected to this pipe socket 58 after opening.

Claims (20)

  1. High-pressure cleaning device comprising a piston pump with a housing (1), at least one pump chamber (10) being located in said housing and opening via an outlet valve (39) into a pressure chamber (24) arranged in the housing (1), and a pressure line (27) exiting from said pressure chamber and having a constriction for generating a flow-dependent difference in pressure upstream and downstream of the constriction, characterized in that a cavity (7) directly connected to the pump chamber (10) is arranged in the housing (1), an insert (23) being sealingly inserted into said cavity and dividing the cavity (7) into the pressure chamber (24) facing the pump chamber (10) and a suction chamber (25), and that the suction chamber (25) is connected to the pressure line (27) downstream of the constriction (28).
  2. High-pressure cleaning device as defined in claim 1, characterized in that a chemical suction line (34) opens into the suction chamber (25).
  3. High-pressure cleaning device as defined in claim 2, characterized in that the chemical suction line (34) is closed by a check valve (36, 37) openable in inflow direction.
  4. High-pressure cleaning device as defined in claim 3, characterized in that the check valve (36, 37) for the chemical suction line (34) is mounted on the insert (23).
  5. High-pressure cleaning device as defined in any of the preceding claims, characterized in that an injector (28) sealingly penetrates the suction chamber (25), said injector being in flow connection with the pressure chamber (24) on the one hand and with the pressure line (27) exiting from the housing (1) on the other hand and thereby forming part of the pressure line and said injector communicating via an opening (30) with the suction chamber (25).
  6. High-pressure cleaning device as defined in claim 5, characterized in that the injector (28) is held on the insert (23).
  7. High-pressure cleaning device as defined in claim 6, characterized in that the injector (28) is sealingly inserted into an opening (29) penetrating the insert (23).
  8. High-pressure cleaning device as defined in any of claims 5 to 7, characterized in that the injector (28) consists of plastic.
  9. High-pressure cleaning device as defined in any of the preceding claims, characterized in that the insert (23) consists of plastic.
  10. High-pressure cleaning device as defined in any of the preceding claims, characterized in that the housing (1) is divided at the level of the insert (23) and an annular seal (22) abutting on the insert (23) and on the two housing parts (1, 19) is arranged in this region.
  11. High-pressure cleaning device as defined in any of the preceding claims, characterized in that the insert (23) bears an outlet valve (39) for each pump chamber (10), said outlet valve being sealingly inserted into a connection between pump chamber (10) and pressure chamber (24).
  12. High-pressure cleaning device as defined in claim 11, characterized in that the valve seat of the outlet valve (39) is integrally formed onto the insert (23).
  13. High-pressure cleaning device as defined in claim 11, characterized in that the valve seat (40) of the outlet valve (39) is designed as a plastic ring sealingly insertable in the connecting line (26) between pump chamber (10) and pressure chamber (24).
  14. High-pressure cleaning device as defined in claim 13, characterized in that the valve body (43) of the outlet valve (39) consists of plastic.
  15. High-pressure cleaning device as defined in claim 14, characterized in that the outlet valves (39) are held on the insert (23) via holding arms (42) of, if necessary, different lengths such that their distance from all the pump chambers (10) is the same.
  16. High-pressure cleaning device as defined in any of the preceding claims, characterized in that a bypass line (8) leads from the pressure chamber (24) in the housing (1) to the suction side of the pump chamber (10) and that a closure valve (54, 55) closing the bypass line (8) in relation to the pressure chamber (24) is held on the insert (23).
  17. High-pressure cleaning device as defined in claim 16, characterized in that the valve seat (55) of the closure valve is designed in one piece with the insert (23).
  18. High-pressure cleaning device as defined in claim 16 or 17, characterized in that the valve seat (55) of the closure valve is sealingly inserted into the bypass line (8).
  19. High-pressure cleaning device as defined in any of claims 16 to 18, characterized in that a control piston (50) is mounted sealingly and displaceably in an opening (48) of the insert (23) connecting the pressure chamber (24) with the suction chamber (25), said control piston being connected to the valve body (54) of the closure valve.
  20. High-pressure cleaning device as defined in any of the preceding claims, characterized in that all the connecting lines (26) leading from the pump chambers (10) to the pressure chamber (24) and, if necessary, the bypass line (8) are arranged in the housing (1) in a plane next to one another and parallel to one another.
EP92904614A 1991-03-05 1992-02-14 High-pressure cleaning device Expired - Lifetime EP0574420B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4106956 1991-03-05
DE4106956 1991-03-05
PCT/EP1992/000325 WO1992015783A2 (en) 1991-03-05 1992-02-14 High-pressure cleaning device

Publications (2)

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

Family

ID=6426493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92904614A Expired - Lifetime EP0574420B1 (en) 1991-03-05 1992-02-14 High-pressure cleaning device

Country Status (4)

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

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 (en) * 1990-01-19 1991-07-25 Buchen Smb Gmbh High pressure plunger pump - has outlet hoses connecting to accumulator and of same length

Also Published As

Publication number Publication date
EP0574420A1 (en) 1993-12-22
DE59202039D1 (en) 1995-06-01
WO1992015783A3 (en) 1992-10-29
WO1992015783A2 (en) 1992-09-17
DK0574420T3 (en) 1995-07-03

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