EP0899027A2 - Method of operating a high pressure device, in particular a high pressure cleaner, and high pressure device - Google Patents

Abstract

Additives, e.g. liquid detergents or solutes from pills, are injected at the suction, rather than the delivery, of the high-pressure pump. The mixing chamber (14) and water inlet socket (11), which forms part of it, is easily removable from the washer casing and hence connected to the pump suction (5) with a flexible pipe. The additive container (28), provided for solids, is screwed into the mixing chamber and is transparent so that the additive level is easily visible. The equipment is designed for an inlet pressure between 4 and 10 bar and a jet pressure between 80 and 100 bar. The arrangement of the mixing chamber (14) is designed to accommodate a solid additive (76). Liquid additives are fed through a line at (53). Low pressure water entering at (21) passes through a filter (19) into control valve (50). This valve permits water to enter, or bypass, a container (28). In the closed position the valve uncovers a vent to atmosphere. The outer housing (2) and particularly the mixing chamber, are plastic injection moldings.

Description

The invention relates to a method for operating a Dispensing a liquid provided high pressure device, especially a pressure washer.

High pressure devices for dispensing a liquid under High pressure is used in many areas of technology. The liquid is usually water or consists of essentially from water. With such high pressure devices it is sometimes desirable to add one or two liquids add several additives. For pressure washers can be mixed with cleaning substances, for example to the essentially mechanical cleaning effect of the liquid dispensed under high pressure.

In high pressure cleaners, it is known to have one or more Cleaning substances via separate low pressure lines of the Add liquid emerging from the high pressure device.

An additive supply by means of separate low pressure lines is particularly because of the associated additional constructive effort to provide additional Pipes and pumps or the like. Disadvantageous. It is more Effort needed to get the desired dosage of the additives and even mixing with the liquid to reach.

It is also known to be liquid detergent or Add detergent solutions by means of mixing devices, that work on the principle of a water jet pump. A cleaning agent line opens into one the liquid outlet line downstream of the pump of the high-pressure device. Because of the high pressure quickly flowing liquid is carried away by detergent, which creates a suction effect that is automatically liquid Additives into the flowing liquid. The Addition according to the principle of the water jet pump is open the use of liquid additives or additive solutions limited and with regard to the dosage of the additives partly unsatisfactory. The degree of admixture depends heavily on the flow rate of the liquid in the Output line. It can, for example, by the attachment of additional devices such as high-pressure nozzles, rotor nozzles, Wash brushes or the like in the area of the outlet line Dynamic pressure arise, which is an admixture according to the principle the water jet pump uncontrollably affected or completely prevented.

Mixing devices, for example in DE 34 26 576 described type, for dispensing solid-form, soluble additives to flowing liquids are provided, are in terms of uniformity the admixture and the dosing of the additives very much advantageous; however, they are for use with water pipe pressure (usually 5 to 10 bar, in exceptional cases up to to 16 bar). A transfer of the principle to higher pressures, for example five to ten times that normal water pipe pressure, would only be with great constructive Effort and through relatively heavy and stable mixing devices possibly possible.

The invention has for its object a method indicate with which a uniform and well dosed Addition of additives to one of a high pressure device dispensable liquid can be achieved. In particular, the method should be feasible with devices be the only minor constructive and manufacturing technology Require effort.

The invention proposes a method for solving this problem with the features of claim 1.

In particular when operating high-pressure cleaners the liquid is advantageously used at least one additive added. According to the invention the additive of the flowing liquid upstream added to a pump of the high pressure device and it becomes together with the liquid from the pump under one compared to an inlet pressure of the pump increased outlet pressure spent.

The numerous advantages of this method are as follows worth mentioning. The method enables use all for the low pressure range, especially the Water pipe pressure range, designed and proven mixing devices known types of admixture at least an additive for the high pressure area. The Mixing can take place in particular at a pressure which corresponds to the inlet pressure of the pump. For example Mixers of those described in DE 34 26 576 Type for flow around additive tablets and / or known ones Mixers for liquid additives, for example after Mixing devices operating on the water jet pump principle, be used. Because on the input side or suction side the pump is usually only the pressure of the liquid source, especially the usual water pipe pressure, before, which is usually at most one tenth of the initial pressure usual high pressure devices. The inlet pressure can preferably be between 2 and 20, in particular be between 4 and 10 bar. The outlet pressure or High pressure with which the additive together with the liquid spent may be more than double, preferably between five times and ten times the inlet pressure, be. For example, it can be more than 40 bar, in particular between 80 and 100 bar. It is also advantageous that upstream of the pump Admix the pump itself to mix Additive and liquid contributes, thereby reducing that of the High pressure device dispensed liquid or Contains additives in a particularly even distribution. If desired, additives can also be added, the the pump and the piping system of the high pressure device care from the inside.

Preferably the additive of the flowing liquid between a liquid inlet of the high pressure device and an inlet opening of the pump. This can the high pressure device itself through its liquid inlet can be connected to any water source, for example to the public water supply network. Via the liquid inlet the liquid can also, for example a liquid reservoir under atmospheric pressure be sucked.

In a preferred process, the additive is not already in a solution before, but it will be added through the liquid from a solid additive carrier, for example a detergent tablet in of the type described in DE 34 26 576.

The invention also relates to an implementation high-pressure device suitable for the described method, especially a pressure washer.

The high-pressure device according to the invention has at least one Pump, which has an inlet opening for inflowing the under a Inlet pressure standing liquid and an outlet opening for dispensing the liquid under a compared to the inlet pressure has increased outlet pressure. Furthermore, one Mixing device for preferably optional mixing of at least one additive to the liquid. According to the invention, the admixing device is in the direction of flow the liquid in front of the inlet of the Pump, so arranged on the suction side of the pump. This allows advantageous arrangement of an admixing device the advantages described in connection with the method, in particular the use of known, for normal pressure, in particular mixing devices designed for water pipe pressure, in a high pressure device.

It is possible to rigid the mixing device with the pump to connect liquid-conducting. Preferably, the Mixing device, however, a liquid outlet with the inlet opening of the pump via at least one at least sectionally flexible line connected to conduct liquid is. The line is preferably a flexible hose, for example a plastic hose. A flexible line section enables any mutual arrangement of pump and admixing device and possibly a relative one Movement of pump and admixing device to each other below Maintaining the liquid-conducting connection. At a preferred embodiment, the line runs between Admixing device and pump at least in sections, preferably completely within a housing of the high-pressure device, making the line good against damage is protected. The housing of the high pressure device is preferably essentially closed. It can be a metal case , but preferably consists essentially of sufficiently stable plastic parts.

The admixing device can be outside of the housing High-pressure device may be arranged, possibly in a separate one Casing. The admixing device is preferably in such a manner or arranged on a housing of the high-pressure device, that preferably all for the operation of the mixing device provided controls from outside the housing are accessible, especially without opening the housing or other changes to the housing must be made. In a preferred embodiment is a housing element the housing of the high pressure device, in particular a removable or hinged cover plate, fixed to the Mixing device connected, the connection preferably is solvable. The admixing device can, for example screwed to the housing element, in particular the cover plate or be pinched. Such integration the mixing device into the housing of the high-pressure device, especially in a movable and possibly from the Removable housing element, and possibly the outside allow pointing controls of the mixing device easy access to the mixing device, for example for changing solid tablets containing additives. Furthermore, it is compact, against pollution and mechanical Damage largely insensitive arrangement of the Mixing device created. Moreover, it is one Mixing device as a whole easily without major effort interchangeable.

One embodiment of the high pressure device has at least a connection device for the supply of liquid, the for example a standardized connection nipple with quick coupling may include. The connection device is with the Inlet opening of the pump can be connected in a liquid-conducting manner, see above that the pump is connected to the connection device, for example a water pipe can be connected. Preferably is the connection device as part of the admixing device trained so that the liquid inlet of the admixing device at the same time the liquid inlet of the high pressure device is. A connection device for the liquid supply, the one unit with the admixing device forms, has a small footprint and the manufacturing cost is low. You can also have two parts for one Operators must be accessible close to each other, for example in the area of the housing wall of the high pressure device, to be ordered.

The arrangement of the connection device relative to one Liquid discharge opening of the high pressure device is basically any; in a preferred embodiment is the connection device at one of the liquid discharge opening opposite side of the high pressure device arranged. A preferred embodiment of the high pressure device is mobile in one direction and the connection device and the one designed, for example, as a nozzle The dispensing opening is on the opposite side when viewed in the direction of travel Sides of the high pressure device. This "inline" arrangement of external water supply and high pressure outlet in Driving direction is easy to use and safe.

The high-pressure device is expediently a shut-off device assigned by which the supply of liquid to the High pressure device can be shut off. The shut-off device can one of the high pressure device and / or the Mixing device be separate device. She is with a preferred embodiment, however, in the mixing device integrated, which facilitates operation and space saves.

On the suction side or the input side of the high pressure pump can with a high-pressure device designed according to the invention known admixers are used, for example working on the water jet principle Mixing devices for mixing liquid additives or admixers for soluble solid additives, such as them for example from DE 34 26 576 or DE 32 30 783 are known.

One also independent of the high pressure device of the invention Mixing device can be used with advantage Release of solids present in the liquid soluble additives formed, whereby the known Advantages of such admixing devices (ease of use, very good dosing, uniform mixing) can also be used for high-pressure devices. A preferred one Mixing device has one with the connection device the high pressure device connectable liquid inlet and one that can be connected to the inlet opening of the high-pressure pump Liquid outlet and one for taking up the additive provided receptacle, the interior of which the liquid outlet is connected to conduct liquid. The Mixing device has one between several control positions adjustable control device. This has a shut-off position at which the liquid inlet is closed, a continuous position in which the liquid inlet in essentially bypassing the receptacle directly with the liquid outlet is connected and one or more Mixing positions in which the liquid inlet with the Interior of the receptacle is connected. In the mixing position becomes at least part of the inflowing Liquid passed through the interior of the receptacle, where this partial stream absorb the additives can. The control device is preferably between the Control positions continuously or continuously adjustable, so that an operator in particular between minimal and freely select maximum admixture and accordingly Can add additives finely.

In one embodiment of the invention, the control device one in a valve housing of the admixing device movable control member, which is a first fluid guide from a valve inlet opening of the valve housing to one with connected to the liquid outlet of the admixing device first valve outlet opening and a second liquid guide from the valve inlet to one with the interior of the receptacle connected to the second valve outlet opening controls. The control member can be a linearly movable slide be. The control member is preferably in the valve housing arranged rotatably about a valve housing axis. The tax authority is appropriately shaped so that it moves the valve inlet opening or the valve outlet openings either closes or opens more or less. The Art The control system is controlled by the shape of the control unit on the one hand and the arrangement of the valve openings on the other certainly.

The control member, preferably made of plastic, can be in one piece. In a preferred embodiment it is in several parts and comprises a first control element and at least a second control member, which is preferably detachable with the first control element is connected. Through a multi-part Training of the control body can this complexly shaped if necessary Part manufactured particularly easy in terms of manufacturing technology be, for example, by injection molding. The control links can, if desirable, be biased against each other be, for example by spring force. This allows you to may result in better sealing properties. Preferably that is second control member rotatably with the first control member connected.

One between a possibly pressurized liquid source and a pump of the cooking pressure device Mixing device usually remains under one certain fluid pressure when the pump is switched off or at least no liquid sucks in and possibly the shut-off device is in blocking mode. This can cause that due to the design principle and / or in the presence a safeguard against opening the pressure-loaded Mixing device this, for example to replace Additive tablets that cannot be opened. If for example, the container for the additive one Screw cap includes, this can be due to static friction a screw thread of the housing cover not or only with high force can be opened by hand. These problems occur in a preferred embodiment of the mixing device not on. This particularly to the invention Use between liquid inlet and pump one High-pressure device adapted mixing device at least one pressure relief opening from the interior the mixing device downstream of the liquid inlet leads to the outside of the admixing device. The pressure relief opening can be especially at ambient pressure flow out. Alternatively or additionally, outside of the Mixing device between a shut-off device High pressure device and the pump at least one lockable Pressure relief opening may be provided, which liquid-carrying area connects to the outside.

It can be a movable closure member for the pressure relief opening be provided, preferably with such the control device of the admixing device is coupled, that the pressure relief opening is only in the shut-off position the control device is at least partially open. If the closure member at least the pressure relief opening partially released, so that with the pressure relief opening communicating fluid-carrying area of the High pressure device depressurized by part of the Liquid to the outside through the pressure relief opening occurs. In the unloaded state, the mixing device can can be opened easily and safely.

It is possible to open the pressure relief opening and its closure regardless of the admixing device and possibly of to arrange and / or to operate its control body. For example can a separately operable closure member for one somewhere in the pipe system between the shut-off device and pump provided pressure relief opening be. Preferably, the closure member is such with the Control device coupled that the pressure relief opening at least in the shut-off position of the control device partially opened, in the open position and the admixing position however is closed. In particular, it can Closure member be coupled to the control member such that it by movement, especially by turning the control member can be actuated. The closure member is preferably part of the tax body, in particular identical to one of the Tax elements of the tax body. Through this training receives the control unit in addition to opening and closing the valve openings another function as a closure member for the Pressure relief opening.

The high-pressure device can be one of the connection devices in Downstream filter device for Removal of solid particles from the liquid flowing into the pump have what operational safety and / or Service life of admixing device and / or pump increased. The admixing device itself can have filter media, especially in the form of inevitable in the liquid flow inserted seven.

These and other features go beyond the claims also from the description and the drawings, wherein the individual features individually or separately several in the form of sub-combinations in one embodiment of the invention and in other fields be and can represent advantageous designs.

Fig. 1

eine geschnittene Seitenansicht einer Ausführungsform einer Hochdruckvorrichtung nach der Erfindung,

Fig. 2

eine teilweise geschnittene Ansicht der Beimischeinrichtung aus Fig. 1 senkrecht zur Durchflußrichtung und zur Drehachse des Steuerorgans,

Fig. 3

einen Schnitt durch das erste Steuerglied des Steuerorgans parallel zur Drehachse des Steuerorgans,

Fig. 4

eine Ansicht des Gehäuses der Beimischeinrichtung parallel zur Durchflußrichtung und senkrecht zur Drehachse des Steuerorgans,

Fig. 5

eine Ansicht des zweiten Steuerglieds des Steuerorgangs parallel zur Drehachse des Steuerorgans,

Fig. 6

eine geschnittene Seitenansicht des zweiten Steuergliedes aus Fig. 5 entlang der Linie C-C in Fig. 5,

Fig. 7

zwei zueinander parallele Schnitte senkrecht zur Drehachse des Steuerorgangs durch die Beimischeinrichtung in Absperrstellung, wobei Fig. 7A ein Schnitt entlang der Linie A-A in Fig. 4 und Fig. 7B ein Schnitt entlang der Linie B-B in Fig. 4 ist,

Fig. 8

ein Schnitt durch das Ventilgehäuse und das zweite Steuerglied senkrecht zur Drehachse des Steuerorgans wenig oberhalb der Druckentlastungsöffnung,

Fig. 9

zwei zueinander parallele Schnitte senkrecht zur Drehachse des Steuerorgangs durch die Beimischeinrichtung in Durchlaßstellung, wobei Fig. 9A ein Schnitt entlang der Linie A-A in Fig. 4 und Fig. 9B ein Schnitt entlang der Linie B-B in Fig. 4 ist,

Fig. 10

zwei zueinander parallele Schnitte senkrecht zur Drehachse des Steuerorgangs durch die Beimischeinrichtung in Beimischstellung (minimal), wobei Fig. 10A ein Schnitt entlang der Linie A-A in Fig. 4 und Fig. 10B ein Schnitt entlang der Linie B-B in Fig. 4 ist und

Fig. 11

zwei zueinander parallele Schnitte senkrecht zur Drehachse des Steuerorgangs durch die Beimischeinrichtung in Beimischstellung (maximal), wobei Fig. 11A ein Schnitt entlang der Linie A-A in Fig. 4 und Fig. 11B ein Schnitt entlang der Linie B-B in Fig. 4 ist.

An embodiment of the invention is shown in the drawings and is explained in more detail below. The drawings show:

Fig. 1

2 shows a sectional side view of an embodiment of a high-pressure device according to the invention,

Fig. 2

2 shows a partially sectioned view of the admixing device from FIG. 1 perpendicular to the direction of flow and to the axis of rotation of the control member,

Fig. 3

3 shows a section through the first control element of the control element parallel to the axis of rotation of the control element,

Fig. 4

2 shows a view of the housing of the admixing device parallel to the flow direction and perpendicular to the axis of rotation of the control member,

Fig. 5

2 shows a view of the second control element of the control element parallel to the axis of rotation of the control element,

Fig. 6

5 shows a sectional side view of the second control element from FIG. 5 along the line CC in FIG. 5,

Fig. 7

two mutually parallel sections perpendicular to the axis of rotation of the control mechanism through the admixing device in the shut-off position, FIG. 7A being a section along the line AA in FIG. 4 and FIG. 7B being a section along the line BB in FIG. 4,

Fig. 8

4 shows a section through the valve housing and the second control element perpendicular to the axis of rotation of the control element a little above the pressure relief opening,

Fig. 9

two mutually parallel sections perpendicular to the axis of rotation of the control mechanism through the admixing device in the open position, FIG. 9A being a section along the line AA in FIG. 4 and FIG. 9B being a section along the line BB in FIG. 4,

Fig. 10

two mutually parallel sections perpendicular to the axis of rotation of the control mechanism through the admixing device in the admixing position (minimal), FIG. 10A being a section along the line AA in FIG. 4 and FIG. 10B being a section along the line BB in FIG. 4 and

Fig. 11

two mutually parallel sections perpendicular to the axis of rotation of the control mechanism through the admixing device in the admixing position (maximum), FIG. 11A being a section along the line AA in FIG. 4 and FIG. 11B being a section along the line BB in FIG. 4.

In Fig. 1 is a side view of a water pressure washer trained high pressure device 1 in cross section shown. An essentially closed, multi-part Plastic housing 2 of the pressure washer encloses one electrically driven high pressure pump 3, which has a electrical connection cable 4 can be supplied with mains voltage can. The pump 3 arranged in the bottom region of the housing 2 has an inlet opening 5 for tap water on its underside and the liquid discharge opening on its front the discharge opening forming the high pressure device 6, through which the water under a high pressure of 80 to 100 can be delivered in cash. The pressure washer is by means of an oval handle opening 7 at the top of the housing portable and can, if desired, parallel to a direction of travel 8 by means of plastic wheels 9 in the rear area of the Housing are moved.

At the rear of the discharge opening 6 opposite Housing 2 is a connection device 10 for connecting the Pressure washer provided on a water pipe. The Connection device 10 comprises a hose connection piece 11 for quick coupling of a water hose. Of the Hose connection piece 11 is on through the housing wall protruding, tubular extension 12 of a plastic housing 13 screwed on an admixing device 14. The Connection device 10 of the pressure washer forms at the same time the connection device of the admixer 14. Die Mixing device has one with the connection device in liquid-conducting connection bringable liquid outlet 15, which has a completely inside the housing 2 extending flexible plastic hose 16 with the inlet opening 5 of the pump 3 is connected to conduct liquid. Of the Hose is typically for fluid pressures up to 20 designed for bar. The direction of flow is through an arrow featured.

The arrangement of an admixing device on the low pressure side or suction side of the high pressure pump of a high pressure device allows to add additives the liquid to be dispensed by the high pressure device to use such admixers, which are only for Low pressures constructed like normal tap water pressures were. By means of the invention, these can also be related with high pressure device for admixing additives be used.

The admixing device 14 can be seen better in FIG. 2 Firmly with an angled cover plate 17th connected, which is a housing part of the plastic housing 2 represents and in straight guide rails 18 of the housing is displaceable parallel to the viewing direction of FIG. 1. The Cover plate 17 can be used together with the admixing device 14 by pulling backwards parallel to the direction of view Housing removed, which due to the flexibility of the Hose 16 is easily possible. This is the opening for the housing part having the shoulder 12 is also movable connected to the rest of the housing 2 so that it is when the cover plate 17 is also removed from the housing can be removed. When the admixing device is inserted, an 1 appearing cruciform holder of the housing 13th without play in a cylindrical receptacle of the housing 2 and stabilizes the position of the mixing device shown in the Housing 2. By integrating the mixing device 14 and the connector 10 in the housing of the high pressure device and the flexible coupling of the mixing device Access to the admixing device is via the hose 16 for example for repair purposes, easily possible.

In the installed state of the mixing device 14 are those components that are accessible for their operation must and which are described in more detail below (Actuating lever for the actuator that in Fig. 1 after rear facing cover for the additive receptacle and connection device) from outside the housing 2 accessible.

The admixing device 14 is described in more detail below. It has a housing 13, which is based on Figures 2, 4 and 7 is explained in more detail. The housing 13 is in one piece Plastic injection molded part. It essentially has a variety cylindrical openings, their cylinder axes parallel run to three mutually perpendicular axes. An axis referred to as flow axis 21 is concentric through the connection device 10, the sleeve-shaped, hollow extension 12 and the valve inlet opening 20 that the hollow interior of the approach 12 with the interior 23 one Valve housing 24 connects. One runs perpendicular to it Valve housing axis 22 which is aligned with the central longitudinal axis of the cylindrical interior 23 of the valve housing 24 coincides. The valve housing 24 is an integral part of the Housing 13 of the admixing device. On the housing 13 of the Mixing device is also a substantially cylindrical Approach 25 formed on the inside Thread 26 is provided, in which a cup-shaped, transparent Screwed plastic lid 27 of the receptacle 28 can be. The approach 25 with the lid 28 is in Fig. 1 to the rear over the housing surface of the pressure washer out. The receptacle 28 has a substantially cylindrical interior 29, the central one Receptacle axis 30 perpendicular to axes 21, 22 runs. Coaxial to axis 30 is below shoulder 25 a formed from vertically adjacent ribs Molded holder of the attachment of the mixing device in the housing of the high pressure device.

Concentric with the projection 25 runs parallel to the axis 30 a tube 31 which forms a cylindrical channel 32. Of the Channel 32 opens vertically into a cylindrical liquid channel 33, which runs parallel to the flow axis 21 and its central axis with respect to the flow axis 21 in Direction of the axis 30 is offset in parallel (Fig. 4). Of the Channel 33 opens in the area of the second valve outlet opening 34 in the cylindrical interior 23 of the valve housing 24 and connects, together with the tube 31, the interior 23 of the Valve housing with the interior 29 of the receptacle 28. With an admixing device assembled ready for operation is the channel 33 beyond the mouth of the channel 32 through a blind plug 35 is closed in a liquid-tight manner (FIG. 7).

In parallel to the channel 33 and the flow axis 21 runs in the housing 20 another substantially cylindrical Liquid channel 36, its central longitudinal axis opposite the central axis of the channel 33 both in height (parallel to axis 22) and laterally offset (Fig. 4). The channel 36 opens in the area of the first valve outlet opening 37 in the interior 23 of the valve housing 24. The liquid channel 36 opens into the liquid outlet 15 of the admixing device (Fig. 7B).

In Fig. 2 there is an approximately in the bottom 39 of the receptacle right-angled connection opening 40 to recognize that in a Connection channel 41 approximately rectangular in cross section passes over, the interior 29 of the receptacle is liquid-conducting with the channel 36 and thus with the liquid outlet 15 of the admixing device connects (Fig. 7B).

In FIGS. 2 and 8 there is in the bottom 42 of the valve housing 24 eccentrically to the valve housing axis 22, a pressure relief opening 43 to recognize, to the outside a cylindrical Nipple 44 connects to the inside of the valve housing has a diameter extension into which a circular O-ring 45 can be inserted. Through the pressure relief opening 43 can the interior 23 of the valve housing and thus the interior of the admixing device with the surroundings be connected in a liquid-conducting manner. A circular centric Opening 46 in the bottom 42 of the valve housing is used Implementation of a fastening bolt 47 with which the following described control element in the valve housing can be attached. The free end of the bolt 47 has one Sawtooth corrugation, with which the bolt is in an axial Opening of the control member 50 (Fig. 3) claws. The bolt secures the built-in control element from falling out the valve housing.

All openings or channels described have axes, which run parallel to axes 21, 22 or 30. A Such housing body can despite its complex shape relatively easily made in one piece using injection molding technology become.

In Fig. 2 it can be seen that in the mixing device in the cylindrical interior 23 of the valve housing 24 from two detachably and non-rotatably connected parts existing control member 50 is used. The control body 50 3 has a valve plug design shown in FIG first control element 51 and one shown in FIGS. 5 and 6 second control element 52. The first control element 51 has one recognizable from the side in FIG. 1, for manual Adjustment of the control member provided actuating lever 53 and a central, tubular, in FIG. 3 body 54 opened downward. In FIG. 3 is a built-in below the operating lever 53 Condition outside the housing of the high pressure device lying plate-shaped extension 55 provided the Opening in the cover plate 14 in which the admixing device 14 is attached, covers. By far below the Plate 55 is a circumferential collar 56 is provided on the a circumferential groove 57 is formed on the cylindrical outside, in which an O-ring 58 can be inserted, which when inserted Control member the interior 23 of the valve housing 24 seals out towards the operating lever. 3, behind the body 54 to recognize a control wing 59 which is at a radial distance from the Body 54 is formed on this and the one cylindrical section Outside surface has the built-in control unit with the inside of the valve housing in flat There is sliding contact.

In Fig. 3 is at the lower left end of the body 54 to recognize radially extending, tubular extension 60, whose radial end face is one of the inner surface of the valve housing has corresponding cylindrical curvature. In the radial end face of tube 60 is essentially one circular groove 61 formed into which an O-ring 62 is inserted can be. In the shown in Figures 2 and 7 The blocking position of the control member aligns the approach 60 the valve inlet opening 20 and the O-ring 62 seals the Interior of the valve body against the under line pressure located liquid in the connector 12 from. The tax authority 50 with its the valve inlet opening 20 with the O-ring 62 sealing projection 60 thus forms a shut-off device for the admixer and the entire high pressure device. Below the shoulder 60 is an axial on the body short, radially projecting rib 63 formed which the rotationally fixed connection of the first control member 51 with the in 5 and 6 shown second control member 52 is used.

The second control member 52 comprises a substantially semicircular one Disc 65, concentric with a tubular Approach 66 is formed, the inside diameter of the outside diameter corresponds to the body 54 and in which one with the Rib 53 working groove 67 is recessed. At Composition of the control members 51, 52 is the free end of the body 54 inserted into the neck 66. With correct position The position of the parts relative to one another engages the rib 63 in a form-fitting manner in the groove 67, whereby a rotationally fixed connection arises between the control members 51 and 52. Aligned the central opening 68 of the second control member 52 with the central opening in the body 54.

On the disc 65 is concentric with the approach 66 and in the a cylinder-segment-shaped control wing pointing in the same direction 70 formed, the cylindrical radial outer surface 71 when installed in flat sliding contact with the cylindrical inside of the valve housing. in the Connection with FIGS. 7 and 9 to 11 is explained, like the control wing 70 for optional locking and Opening the valve openings is used.

The facing away from the approach 66 in the installed state Bottom 42 of the valve housing facing, essentially flat Front 72 of the disk 65 has a recess centrally 73, into which an O-ring 74 can be inserted, through the the inside of the valve housing in the area of the centric Opening 46 is sealed in the bottom 42 (Fig. 2). The front 72 forms a sealing surface with a suitable rotational position of the control member, especially in the open position and in the mixing positions, completely on the the O-ring 45 surrounding the pressure relief opening 43 is pressed and thus the opening 43 is liquid-tight closes. The second control element 52 thus acts as Closing member for the pressure relief opening. In the in the Figures 2, 7 and 8 shown shut-off position of the mixing device is the disc 65 aligned so that their through the axis of rotation 22 leading edge in the middle of the pressure relief opening 43, whereby this is partially is open to the environment. Can in the shut-off position thus any overpressure within the valve housing and within all in this position with the interior 23 communicating channels and interiors of the high pressure device be dismantled.

In connection with Figures 2 and 7 to 11, the Function of the mixing device explained. The high pressure device is via the hose coupling 11 of the admixing device connected to a water hose. Incoming Water is through a dome-shaped sieve 19 in Approach 12 freed of contamination particles if necessary. Thereby can clog or damage the mixing device and the other liquid-carrying parts of the Pressure washer reliably due to inflowing particles be prevented. In the shown in Figures 7 and 8 The shut-off position seals circularly around the valve inlet opening 20 revolving O-ring of the control member opening the valve liquid-tight from, so that no tap water in can reach the interior 23 of the valve housing. Of the Control wing 70 simultaneously covers both valve outlet openings 34, 37 essentially. However, the cover is not completely liquid-tight, so that the interior 23 of the Valve housing both via channels 33 and 32 with the Interior 29 of the receptacle and via the channel 36 and the liquid outlet 15 as well as the on these connected hose 16 with the pump 3 in liquid-conducting Connection is established. The aforementioned, liquid-carrying Areas can be partially closed off opened pressure relief opening 43 can be depressurized. In the relieved state, it is particularly safe and effortlessly possible, the outside with grip ribs screw on the provided lid 27 of the receptacle 28, for new additive tablets 76 if necessary to use.

By turning the control element 50 by 45 ° clockwise 9 becomes the open position of the admixing device shown in FIG reached. The valve inlet opening is in the open position 20 in connection with the interior 23 of the Valve body because the neck 60 with the sealing O-ring 62nd was turned away to the side. The control wing 70 covers the in the second valve outlet opening leading the liquid channel 33 34 with lateral overlap, so that this way for the Liquid remains essentially closed. Against it 9B that the first valve outlet opening 37 is completely released from the control wing 70. By the Valve inlet 20 inflowing liquid can the body of the Flow around the control element, as indicated by the arrows, and from the valve housing directly through channel 36 and the Liquid outlet 15 and the hose 16 to the inlet opening 5 of the pump 3. Channel 36 is above the Openings 40, 41 also in connection with the interior 29 of the Receptacle 28, a liquid flow in this direction is however due to the closure of the opening 34 the wing 70 practically excluded. So it will be first the clear water position is set, in which none Admixture of additives takes place.

When the control member 50 is rotated clockwise by more The admixing position shown in FIG. 10 becomes 30 ° with slight Admixture reached. In this tax position the valve inlet opening 20 is also free. The second valve outlet 34 is about one tenth of its cross section opened because the control wing 70 is part of the passage cross section released. In Fig. 10B is too recognize that the first valve outlet opening 37 continues is open over the entire cross section. In the main stream reaches this position of slight admixture the liquid, similar to Fig. 9, by the Channel 36 bypassing the additive contained Receiving container directly to the liquid outlet 15 of the admixer. A minor amount of inflowing However, liquid flows through the channel 33 and the pipe 31 into the interior 29 of the receptacle 28. On the inside of the lid 27 can above the mouth of the tube 31 swirling ribs drawn in dashed lines on the lid be formed, the liquid distribution in the interior promote. Flows from the upper outlet of the tube 31 the liquid axially downwards on the inside and Outside of the ring-cylindrical additive tablets 76 passing through the sieve 77 covering the opening 40 and the Connections 40, 41 in the channel 36. This minor, with The amount of liquid added to the dissolved additives is determined by the Main stream of liquid flowing directly through, so that the liquid emerging from the liquid outlet 15 overall carries a small amount of additive.

The control position of maximum admixture shown in FIG. 11 is started after the control member 50 has been rotated by approximately 105 ° from the open position. In this position maximum admixture are the valve inlet opening 20 and the second valve outlet opening 34 over its full cross section released so that liquid flowing into the valve housing unhindered via channels 33 and 32 in the area the dome-shaped curvature of the container lid can get above the tablets 76. It flows from there Axial liquid with absorption of dissolved additives past the tablets below and through the bottom 39 of the Receptacle sealing screen 77 and the Connection 40, 41 and the liquid channel 36 to the liquid outlet 15 of the admixing device. In the sieve 77 Any solid particles that may have come out of the tablets get caught. In Fig. 11B it can be seen that the direct Away from the valve housing to the liquid outlet 15 through the Control wing 59 of the first control member 51 is blocked. In the position of maximum admixture is essentially the total liquid flow through the receptacle for the Additives passed so that here a maximum absorption of Additives.

Inevitable by the two in the liquid flow inserted screens 19, 77 acts as an admixing device Cleaning device for the liquid flowing to the pump. This can reduce the operational safety and lifespan of the Promote high pressure device.

The mixing device makes it possible to continuously or continuously between those detailed here Switch control positions. The tax characteristic is essentially by the size and location of the control wing and the relative arrangement of the outlet openings 34, 37 with respect to the Axis of rotation 22 of the control member 50 is determined. It is advantageous in particular, that the valve outlet openings 34, 37 with respect the axis of rotation 22 offset in height on different levels (Levels A and B in Fig. 4) and that they are related to the Axis of rotation 22 are angularly offset. This promotes good Adjustability of the corresponding average cross sections and thus the accuracy of the dosage. A scale on the Cover plate 17 in the region of the operating lever 53 gives that Operator information about the level of the set Admixture.

When the control member rotates in the opposite direction, it is successive the part of the high-pressure pump guided through the admixing chamber 29 3 water supplied reduced and over a Position in which only the direct exit 37 is open, finally the water inlet was shut off and then in the Shut-off position shown, the pressure relief bore 43 at least partially released. The one via the pressure relief hole The amount of water released is usually extremely low and can be harmless directly inside the Housing are derived. If desired, can be sent to the Nipple 44 can also be provided a drain hose, which escaping water around critical components inside the Housing the high pressure device around and out of Can lead out housing.

Claims (22)

Method for operating a liquid dispenser provided high pressure device, in particular a pressure washer in which the liquid at least one additive is added, thereby characterized in that the additive of the flowing Liquid upstream of a pump (3) High pressure device (1) is added and together with the liquid from the pump under one opposite output pressure increased output pressure becomes. A method according to claim 1, characterized in that the additive is mixed in at the inlet pressure of the pump becomes. A method according to claim 1 or 2, characterized in that that the liquid is water and preferably the Inlet pressure essentially the water pipe pressure corresponds and / or that the inlet pressure between 2 and 20 bar, in particular between 4 and 10 bar. Method according to one of the preceding claims, characterized in that the outlet pressure is more than double, preferably between five times and is ten times the inlet pressure, where preferably the outlet pressure is more than 40 bar, preferably is between 80 and 100 bar. Method according to one of the preceding claims, characterized in that the additive of the flowing Liquid between a liquid inlet of the High pressure device and an inlet opening of the pump is added. Method according to one of the preceding claims, characterized in that when the Additive through the liquid from a solid Additive carrier is removed, preferably at the inlet pressure. High pressure device for dispensing a liquid, especially pressure washer, with at least one Pump that has an inlet opening for inflowing the under an inlet pressure standing liquid and a Dispensing opening for dispensing the liquid under a has increased outlet pressure compared to the inlet pressure, and with an admixing device for admixing at least one additive to the liquid, thereby characterized in that the admixing device (14) in Flow direction of the liquid in front of the inlet opening (5) the pump (3) is arranged. High-pressure device according to claim 7, characterized in that the admixing device (14) has a liquid outlet (15) with the inlet opening (5) via a flexible line, at least in sections is connected in a liquid-conducting manner, the line preferably at least one flexible hose (16) comprises, preferably the line (16) at least in sections, preferably completely, within of a housing (2) of the high pressure device. High-pressure device according to one of claims 7 or 8, characterized in that the admixing device (14) in or on a housing (2) of the high-pressure device is arranged that at least one control element, preferably all controls (10, 28, 53) of the Mixing device accessible from outside the housing and / or that the admixing device (14) is fixed, preferably detachable, with a housing element Mixing device, in particular a cover plate (17), the housing element (17) preferably detachable with the housing (2) of the high pressure device connected is. High-pressure device according to one of claims 7 to 9, characterized in that the high pressure device at least one fluid-conducting with the inlet opening of the pump connectable connection device (10) for has the supply of liquid, preferably the Connection device (10) as part of the admixing device (14) is formed and / or wherein the connection device (10) at a liquid discharge opening (6) opposite the high pressure device Side of the high pressure device is arranged. High-pressure device according to one of claims 7 to 10, characterized in that the high pressure device in a direction of travel (8) and that the connection device (10) and the liquid discharge opening (6) the high pressure device on in the direction of travel opposite sides of the high pressure device are arranged. High-pressure device according to one of claims 7 to 11, characterized in that one of the high pressure device assigned, in particular arranged on this Shut-off device (20, 50, 60, 62) for shutting off the Supply of liquid to the high pressure device is provided, preferably a shut-off device (20, 50, 60, 62) into the admixing device (14) is integrated. High-pressure device according to one of claims 7 to 12, characterized in that the admixing device (14) for dispensing at least one in solid form (76), additive soluble in the liquid is trained. High-pressure device according to one of claims 7 to 13, characterized in that the admixing device (14) a liquid inlet (20) and a liquid outlet (15) and one for taking up the additive (76) provided receptacle (28), the Interior (29) with the liquid outlet (15) liquid-conducting is connected and that one between several Control positions adjustable control device is provided, the control device with a shut-off position, at which the liquid inlet (20) is closed is a passage position in which the liquid inlet (20) essentially bypassing the Receptacle (28) with the liquid outlet is connected and at least one mixing position, in the liquid inlet (20) with the interior (29) of the receptacle is connected, preferably the control device between the control positions continuously is adjustable. High-pressure device according to claim 14, characterized in that the control device one in a valve housing (24) the admixing device movable control member (50), which has a first liquid guide from a valve inlet opening (20) of the valve housing a first one connected to the liquid outlet Valve outlet opening (37) and a second liquid guide from the valve inlet opening (20) to one with connected to the interior (29) of the receptacle (28) controls second valve outlet opening (34), wherein preferably the control member (50) in the valve housing (24) rotatably arranged around a valve housing axis (22) is. High-pressure device according to claim 15, characterized in that the control member (50) has a first control member (51) and at least one, preferably exactly one comprises a second control member (52) which is preferably releasable is connected to the first control member, preferably the second control member (52) rotatably with the first control element (51) is connected. High-pressure device according to one of claims 7 to 16, characterized in that between the shut-off device (20, 50, 60, 62) and the pump (3) of the high pressure device at least one closable pressure relief opening (43) is provided, the liquid-carrying Area connects to the outside and opens in particular at ambient pressure, preferably the admixing device (14) has at least one lockable Pressure relief opening (43) which from the interior of the mixing device downstream of the Liquid inlet (20), in particular from the interior (23) of the valve housing, to the outside of the admixing device leads and especially at ambient pressure flows. High pressure device according to claim 17, characterized in that that at least one closure member (52) for the Pressure relief opening (43) is provided, which is preferably thus coupled to the control device is that the pressure relief opening is in the shut-off position the control device is at least partially open is, preferably the closure member (52) such is coupled to the control member (50) that it by Movement, in particular rotation of the control member can be actuated is. High-pressure device according to one of claims 15 to 18, characterized in that the control body, in particular the second control member (52), as a closure member is trained. High-pressure device according to one of claims 7 to 19, characterized in that it is one of the connecting device downstream filter device for exemption the liquid flowing to the pump (3), the filter device preferably in the admixing device is integrated and in particular at least an inevitably arranged in the liquid flow Sieve (19, 77) comprises. Use of a low-pressure mixing device, in particular according to one of claims 12 to 20, for Admixing at least one additive to one in an inlet opening of a pump of a high pressure device flowing, under a low pressure, in particular liquid under water pipe pressure. Mixing device, in particular for carrying out the Method according to one of claims 1 to 6, characterized characterized in that according to at least one of the Claims 12 to 20 is formed.

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