Patent Publication Number: US-2017348712-A1

Title: Device for emitting a liquid

Description:
This invention refers to a device for discharging a liquid under pressure, for example a pressure washer or sprayer, with advantageous usage and portability characteristics. Some embodiments of this invention also refer to a device without a power generator, which by the nature of how it is built becomes a pressure washer or (possibly high-pressure) sprayer when mechanically fastened to an external power generator, the nature of which may vary. 
     In some embodiments of this invention, transforming a device designed and built for other purposes creates a cleaning device using a jet of water (possibly high pressure), with the possible addition of detergent stored in a tank. More generally, the device referred to in the present invention may allow low-pressure spraying or high-pressure cleaning, and in some embodiments disinfestation or cleaning by incorporating a tank containing the appropriate chemical products. 
     PRIOR ART 
     Pressure washers and sprayers are machines which, in summary, are composed of a power generator, a pressure generator (for example a high-pressure pump), and a flexible line connected to a pistol attached to a lance, from which the jet of water or other liquid is discharged. All the mechanical and non-mechanical components, with the exception of the flexible line/pistol and lance assembly, are intrinsically connected in a permanent manner inside a single structure with various geometric configurations. Portable pressure washers or sprayers are also intrinsically connected in a permanent manner inside a single structure which can take on various geometric configurations. 
       FIG. 1A  illustrates a schematic side view of a pressure washer  1000 , according to the state of the art. Specifically, the pressure washer  1000  is composed of a body  1001 , wheels  1002 , a lance  1004 , connected to the body  1001  via a hose  1003 , and generating a jet of water  1005 . Although the wheels  1002  allow movement of the pressure washer  1000 , the pressure washer  1000  is nevertheless not ideally suited for use while moving. Specifically, a user who intends to use the pressure washer  1000  while moving will be required to move the pressure washer  1000  continuously. It is possible to move the pressure washer  1000  by pulling the hose  1003 , however this method of use tends to damage the hose and/or its connections to the body  1001  and/or the lance  1004 , and provides poor usage ergonomics. 
       FIG. 1B  illustrates a schematic section view of the pressure washer  1000 . As this illustration shows, the body  1001  comprises a motor-pump assembly  1006  and a container for liquid  1007 . This configuration presents numerous disadvantages. In particular, the user is required to continually move a mass of liquid sufficient for prolonged use, with the corresponding weight. In the event that the pressure washer  1000  is used to wash a vehicle, the user will be required to continuously move around the vehicle body, and the continual need to move the body  1001  will significantly slow down the operation, which becomes inconvenient and tiresome for the user. 
     Moreover, the positioning of the motor-pump assembly  1006  inside the body  1000  generally leads to unsatisfactory performance from the pressure washer  1000 . Specifically, the motor-pump assembly  1006  generally operates in a manner which maintains pressure inside the hose  1003  at all times. More precisely, this static overpressure is also present in the event that the user is not actually using the pressure washer  1000 , for example when the user is moving the pressure washer  1000  towards another area in which it is to be used. In this situation, the pressure inside the hose  1003  reduces the flexibility of the hose  1003  and therefore limits the user&#39;s ability to position the lance  1004 . Moreover, the presence of the above-mentioned pressure makes it difficult for the user to wind the hose  1003  to prevent the hose  1003  blocking the wheels  1002  during positioning of the pressure washer  1000 . Finally, the distance of the motor-pump assembly  1006  from the lance  1004  leads to standing water in the hose  1003  after use of the pressure washer  1000 . This standing water can lead to bad smells and/or hygiene problems in the event that the pressure washer  1000  is not used for an extended period. In addition, this standing water means that the pressure washer  1000  cannot safely be kept in an environment where the temperature may fall below 0° C., like a garage or outdoor tool shed. 
     Sprayers, for example those used for watering a garden, also present the same problems described above. Specifically, the problem of having to move a considerable mass of water is further worsened in the case of a sprayer, which generally uses greater quantities of water than a pressure washer. 
     The method of construction of these types of machine also makes their use exclusive, in other words they cannot be physically joined together and they cannot share other devices for different functions for which they were designed. The state of the art does not include devices which, by the effect of the present invention, can share the same source of mechanical power and other devices, allowing combined use and in this manner being transformed into power washers or sprayers, thus performing different functions for which they were individually designed. 
     OBJECT OF THE PRESENT INVENTION 
     An object of the present invention is to supply a device for discharging a liquid under pressure, for example a pressure washer or sprayer, which offers an advantageous flexibility in its use. 
     A further possible object of the present invention is to create a device for discharging a pressurised liquid in a compact and/or lightweight and/or low-cost manner. 
     Another possible object of the present invention is to improve on the current methods of use of pressure washers and/or (high-pressure) sprayers, which as is well known are limited in their maneuverability due to the large number of flexible components, for example the water supply hose, the high-pressure hose attached to the lance and the electricity cable in the specific cases, which must be connected to them for their operation. These elements limit the user&#39;s freedom of movement during use. 
     In some embodiments, the present invention can increase maneuverability and ease of handling, since the transformation obtained by the connection of the power generator, for example a handheld string trimmer, and the invention can generate a pressure washer and/or sprayer whose operation will depend on a single fixed restriction, consisting only of the water supply line. 
     SUMMARY OF THE INVENTION 
     The objects described above are achieved, at least in part, by a device for the discharge of a pressurised liquid, according to the independent claims. Further advantageous forms of the present invention are described by the dependent claims. One embodiment of the present invention can refer to a device for the discharge of a pressurised liquid comprising: a liquid intake section, a liquid discharge lance, a pump, which can be connected to a motor, the pump having an inlet connected to the intake section and an outlet connected to the discharge lance, where the discharge lance and the pump are connected by a connection with at most three rotational degrees of freedom and/or one translational degree of freedom. This embodiment allows the creation of a highly manageable device. 
     In some embodiments, the connection may comprise a rotating joint and/or a ball joint and/or a sliding joint. This embodiment allows the creation of a connection with one, two or three rotational degrees of freedom and/or one translational degree of freedom. 
     In some embodiments, the connection may comprise fastening elements, preferably screws and/or adhesive and/or welds and/or bolts and/or rivets, and/or an interlocking coupling. This embodiment allows the creation of a connection with zero degrees of freedom. 
     In some embodiments, the pump, the lance and possibly the motor and/or any transmission component nearest the pump can be positioned substantially along a single axis of the device. This embodiment allows the creation of a compact and manageable device. 
     In some embodiments, the device may not include a liquid container, and the liquid intake section may be connectable to a hose. This embodiment allows the weight due to the liquid in the container to be avoided. 
     In some embodiments, where the motor may comprise a motor body, the pump may comprise a pump body and it may be possible to connect and/or remove the pump by coupling and/or decoupling the motor body and pump body. This embodiment allows an external motor to be used as the motor, which may be shared with devices of another type. 
     In some embodiments, the pump body and/or motor body may comprise a locking device to prevent decoupling of the motor body from the pump body. This embodiment makes it possible to prevent accidental decoupling of the motor body from the pump body. 
     In some embodiments, the device may also comprise a motor control device to control the power output from the motor. This embodiment allows the discharge pressure to be controlled via the motor control, instead of having to use pressure modulation. 
     In some embodiments the device may also comprise a tank for a second liquid, preferably a liquid detergent or a liquid to be applied to plants. This embodiment allows the second liquid to be mixed with the pressurised liquid, while still keeping the device compact and lightweight. 
     In some embodiments the tank can be positioned at least partially above or below a mixing section, in the usage position. Thanks to this embodiment the device is kept compact, with a balanced weight. 
     In some embodiments, the device may also comprise a motor. This embodiment allows the device to be made more compact, as it does not require connection to an external motor. 
     In some embodiments, the motor may be a motor for multiple gardening tools, which can be separated from the pump. This embodiment allows a single motor to be shared between multiple devices. 
     In some embodiments, the device may also comprise an outlet check valve with a first position and a second position, wherein in the first position the outlet check valve is open, and wherein in the second position the outlet check valve can be opened if a pressure greater than a predetermined threshold is applied to its intake. This embodiment makes it possible to use the device both with a supply of liquid under pressure, and by drawing a liquid from a container. 
     In some embodiments, the device can also comprise a liquid distribution duct, extended to the periphery of the pump. This embodiment allows cooling of the pump to be performed. 
     In some embodiments, the device can also include at least one intake valve and one outlet valve, positioned radially in the pump. This embodiment allows for a compact pump shape and an advantageous distribution of the forces acting on the valves due to the pressure. 
     A further form of this invention may refer to an interchangeable device comprising a high-pressure pump unit, a water intake, possibly a liquid tank, and a lance, comprising a coupling system comprising a shaped shaft-shaped hub coupling, an anti-rotation positioning element and a locking clamp, wherein the coupling system allows a power generator of varying type to be coupled, making the device a high-pressure washer and/or a high-pressure sprayer. This embodiment allows an external motor to be used with the device for discharging a pressurised liquid. 
     In some embodiment, the lance, possibly multi-way, may not feature a hose and may be directly connected to a single structure formed of: the water intake, the high-pressure pump assembly, and the liquid tank. This embodiment improves the device&#39;s manageability. 
     In some embodiments, the water intake can also be ensured by drawing via suction from a general water source due to the suction generated in the compression chambers of the pump unit. Thanks to this embodiment it is merely necessary for a container of water to be in the vicinity in order to use the device. 
     In some embodiments by the rotation of the lance it is possible to select the geometry of the output jet among one of: rotating conical jet high-pressure nozzle, narrow angle high-pressure nozzle, fan jet high-pressure nozzle, fan jet low-pressure nozzle. This embodiment allows the device to feature multiple operational modes, while maintaining a compact and manageable form. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       The present invention will be clarified below via the description of some of its embodiments represented in the annexed drawings. It should nevertheless be noted that the present invention is not limited to the embodiments represented in the drawings; on the contrary, all variants or modifications of the embodiments represented and described herein which would appear clear, immediate and obvious to those in the field fall within the scope of the present invention. In particular, in the annexed drawings: 
         FIG. 1A  illustrates a side view of a pressure washer according to the state of the art;  FIG. 1B  illustrates a section view of the pressure washer shown in  FIG. 1A ; 
         FIGS. 2A-2C  provide a schematic illustration of, respectively, a side view of devices for discharging a pressurised liquid, according to different embodiments of the present invention; 
         FIGS. 2D and 2E  provide a schematic illustration of, respectively, a side view and a top view of devices for discharging a pressurised liquid, according to other embodiments of the present invention; 
         FIGS. 2F-2H  provide a schematic illustration of, respectively, a side view of devices for discharging a pressurised liquid, according to different embodiments of the present invention; 
         FIG. 3A  provides a schematic illustration of a section view of parts of a pump of a device for discharging a pressurised liquid, according to another embodiment of the present invention;  FIGS. 3B and 3E  provide a schematic illustration of section views of the pump illustrated in  FIG. 3A ; 
         FIGS. 4 and 5  provide a schematic illustration of a section view of parts of a pump of a device for discharging a pressurised liquid, according to other embodiments of the present invention; 
         FIG. 6A  provides a schematic illustration of a section view of parts of a pump and a motor of a device for discharging a pressurised liquid, according to a further embodiment of the present invention;  FIG. 6B  provides a schematic illustration of a section view of the connection of the parts of the pump and motor illustrated in  FIG. 6A ; 
         FIGS. 7A and 7B  provide a schematic illustration of a section view of the alignment and/or positioning and/or locking devices of the connection between the parts of a pump and a motor for a device for discharging a pressurised liquid, according to other embodiments of the present invention; 
         FIG. 8  provides a schematic illustration of a section view of parts of a device for discharging a pressurised liquid, with an integrated motor, according to a further embodiment of the present invention; 
         FIG. 9  provides a schematic illustration of a section view of parts of a device for discharging a pressurised liquid, with a motor control device and/or an integrated handle, according to a further embodiment of the present invention; 
         FIG. 10A  provides a schematic illustration of a section view of parts of a discharge lance of a device for discharging a pressurised liquid, according to another embodiment of the present invention; 
         FIGS. 10B and 10C  provide a schematic illustration of a section view of parts of a discharge check valve of a device for discharging a pressurised liquid, according to another embodiment of the present invention; 
         FIG. 11  provides a schematic illustration of a section view of parts of an additional tank of a device for discharging a pressurised liquid; 
         FIGS. 12 and 13  provide a schematic illustration of section views of parts of mixing control devices for the additional tank illustrated in  FIG. 11 , according to other embodiments of the present invention; 
         FIG. 14A  provides a schematic illustration of a section view of parts of a configurable discharge lance of a device for discharging a pressurised liquid, according to another embodiment of the present invention;  FIGS. 14B and 14C  provide a schematic illustration of section views of the parts of the discharge lance illustrated in  FIG. 14A ; 
         FIGS. 15A and 15B  provide a schematic illustration of two section views of a device for discharging a pressurised liquid, according to another embodiment of the present invention; 
         FIGS. 16A and 16B  provide a schematic illustration of simplified three-dimensional exploded views of a device for discharging a pressurised liquid, according to another embodiment of the present invention; 
         FIG. 17  provides a schematic illustration of a possible operating scheme of a device for discharging a pressurised liquid, according to a further embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Specific embodiments of the present invention shall now be discussed, with reference to the figures, in which the same reference numbers refer to the same elements. It shall nevertheless be clear that the present invention is not limited to the embodiments illustrated and/or described below. Each embodiment defined by the claims shall be considered part of the present invention. 
       FIG. 2A  provides a schematic illustration of a side view of a device for discharging a pressurised liquid  2000 , according to a embodiment of the present invention. 
     The device for discharging a pressurised liquid  2000  comprises a liquid intake section  2400 , a liquid discharge lance  2300  and a pump  2200 . The device  2000  can be connected to a motor  2100 . In the illustrated embodiment, the motor  2100  is present and connected to the pump  2200 ; it shall nevertheless be clear that the present invention may also be implemented without the motor  2100 , simply with the provision for the device  2000  to be connected to a motor  2100 . Embodiments with integrated motor  2100  or with a motor  2100  which can be connected and/or disconnected shall be described below. 
     The device  2000  has an inlet connected to the intake section  2400  and an outlet connected to the discharge lance  2300 . In this manner, the device  2000  is able to pressurise a liquid taken in by the intake section  2400  and discharge it from the discharge lance  2300 , creating a jet  1005 . As can be seen in the figure, the discharge lance  2300  and the pump  2200  are connected in a substantially solid manner. 
     A substantially solid manner shall mean, in some embodiments, a connection with only rotational degrees of freedom, specifically a maximum of three rotational degrees of freedom, preferably a maximum of two rotational degrees of freedom, and ideally a maximum of one rotational degree of freedom. 
     A connection with a maximum of one rotational degree of freedom is illustrated as an example in  FIG. 2C . Specifically, a rotating joint  2800  allows the lance  2300  to rotate around its longitudinal axis with respect to the pump body  2200 , as shown schematically by the arrow. Alternatively, or in addition, a connection with a maximum of one rotational degree of freedom is illustrated as an example in  FIG. 2C . Specifically, a spherical joint  2801  allows the lance  2300  to rotate around the Z axis, as shown schematically by the arrow, possibly within a predefined angle. Alternatively, or in addition, a connection with a maximum of one rotational degree of freedom is illustrated as an example in  FIG. 2D . Specifically, a spherical joint  2801  allows the lance  2300  to rotate around the Y axis, as shown schematically by the arrow, possibly within a predefined angle. 
     Alternatively, or in addition, a connection with a maximum of two rotational degrees of freedom is illustrated as an example in  FIGS. 2D and 2E . Specifically, the spherical joint allows rotation both around the Y and Z axes. In this manner the discharge lance  2300  can be oriented in the required direction, within a spherical range limited by a predefined angle, while still keeping the pump and lance joined together in a substantially solid manner. 
     The predefined angle may be between −45° and 45°, preferably between −30° and 30°, and still more preferably between −15° and 15°, with respect to the axis of longitudinal extension of the device  2000 , corresponding to the X axis in the figure. 
     Alternatively, or in addition, a connection with a maximum of two or three degrees of rotational freedom may be obtained by combining one or more of the previously described embodiments. 
     Alternatively, or in addition, in some embodiments a substantially solid manner may mean a connection with a maximum of one degree of translational freedom, specifically along the axis of extension of the lance  2300 , such as to allow the lance to possibly retract, at least partially, inside the pump body. This connection is illustrated in  FIG. 2F , where the sliding joint  2802  allows the lance  2300  to perform a translational motion along its longitudinal axis with respect to the pump body  2200 , as shown schematically by the arrow. This type of connection may be combined with the connections with one, two, or three degrees of rotational freedom described above. 
     The connections described differ from the flexible hose typical of prior art. Indeed, while permitting a certain amount of movement between the lance  2300  and the pump  2200 , they allow portable use of the device  2000 , for example with one hand on the pump  2200  and one on the lance  2300 . The hose, on the contrary, makes a connection which has various translational degrees of freedom, which makes portable use of known devices inconvenient or impossible. 
     Alternatively, or in addition, in other embodiments, a substantially solid manner may also be taken to mean a fixed connection between the lance and pump which prevents movement of the discharge lance  2300  with respect to the pump  2200 . In other words, a connection with zero degrees of rotational and translational freedom. For example a connection fastened by retaining elements  2803 , as illustrated in  FIG. 2G , for example screws and/or adhesive and/or welds and/or bolts and/or rivets between the body of the pump  2200  and the body of the lance  2300 . As another alternative, or in addition, an interlocking connection  2804  between the two bodies, illustrated schematically in  FIG. 2H , can create a connection with zero degrees of rotational and translational freedom. 
     Alternatively, or in addition, in some embodiments, each connection in which the lance  2300  and the pump  2200  are not connected by a long hose, as is the case for prior art, may be considered a substantially solid manner, in contrast to the completely flexible connection offered by the long hose  1003  used to connect the lance  1004  to the body  1001  of the pressure washer which represents the state of the art. 
       FIG. 2B  provides a schematic illustration of a side view of a device for discharging a pressurised liquid  2000 , according to another embodiment of the present invention 
     Specifically, the device in  FIG. 2B  differs from that in  FIG. 2A  due to the presence of a transmission  2110  between the device  2000  and the motor  2100 . The transmission may be of any type, for example a universal joint, via a rotating axle, chain, belt, reduction unit etc. In general, any mechanical transmission allowing power to be transferred from the motor  2100  to the pump  2200  may be implemented. 
     As is visible, for example, in  FIGS. 2A and 2B , the liquid discharge device  2000  shown in the illustrated embodiments differs from the known device  1000  as there is not a flexible connection between the pump  2200  and lance  2300 . On the contrary, these two elements are connected in a substantially solid manner, as previously described. In addition, in some embodiments a motor  2100  may be included in the device  2000 , also connected in a substantially solid manner to the pump  2200 , possibly via a transmission  2110 . 
     Thanks to the embodiments described above, it is possible to implement a device for the discharge of a pressurised liquid comprising: a liquid intake section  2400 , a liquid discharge lance  2300 , a pump  2200 , which can be connected to a motor  2100 , the pump having an inlet connected to the intake section and an outlet connected to the discharge lance, where the discharge lance and the pump are connected by a connection  2800 ,  2801 ,  2802 ,  2803 ,  2804 , with at most three rotational degrees of freedom and/or one translational degree of freedom. 
     The liquid discharge device  2000  may therefore be handled as a single component by the user, for example by holding it in two hands. For example, a first and second grip may be provided by any one or two elements between the lance  2300 , the pump  2200 , the motor  2100  and/or the transmission  2110 . As an example,  FIG. 17  shows a grip with both hands on the transmission. As a further example, the user&#39;s left hand in  FIG. 17  could grip the pump or the lance. Handles to facilitate the grip could be implemented on any one of the elements described, as described below. 
     Alternatively, or in addition, a shoulder strap may be used to support the weight of the device  2000  while the handgrip is used to direct the device  2000 , or the lance  2300  in the event that this is partially mobile with respect to the pump  2200 . 
     Such use of the device  2000  for discharging liquids is even more advantageous if the size and weight are minimised. This result is obtained thanks to the presence of the intake section  2400 . Specifically, the intake section  2400  allows the intake of the liquid discharged by the device  2000 , for example water. More specifically, the section  2400  allows connection of a pipe  2500 , which may be a flexible hose, the other end of which may then be connected to a liquid supply, for example a tap or container. In this manner the user does not need to carry the liquid container  1007  with him since the pipe  2500  allows the user to operate the device  2000  within a certain radius of the liquid source. It is therefore possible to create a device  2000  for discharging liquid without the presence of a tank  1007  for the liquid, which is, on the contrary, present in prior art. The device  2000  thus features particularly advantageous operation in comparison to such prior art. It is possible, for example, to have a device  2000  operating as a pressure washer/sprayer in proximity to any water source, for example a tap, a container, a swimming pool etc. With the motor  2100  specified as a battery-powered motor or internal combustion engine, the flexibility of use of the device  2000  is further increased. Activities such as cleaning a vehicle, cleaning the border of a swimming pool, irrigating and spraying garden beds, vegetable patches etc. will benefit from the ease of transport and/or use of the device  2000 , thanks to the lack of the internal tank  1007  and thanks to the possibility to handle the device  2000  in an extremely flexible and manageable manner. 
     Furthermore, as illustrated, the pump, the lance and possibly the motor and/or part of a transmission  2110  nearest the pump in the device  2000  are positioned substantially along a single axis of the device, possibly the same axis as the extension of the lance  2300 . This design lends particular manageability to the device  2000 , since the compact nature and longitudinal extension of its structure allow a considerable reduction in weight and thus allow a greater degree of freedom in its movement during use. In some embodiments, the transmission may be flexible, for example in the case of a motor  2100  carried on the user&#39;s shoulder and connected by a flexible transmission  2110  to the pump  2200 . In such embodiments, it will be sufficient for the end of the transmission  2110  on the pump  2200  side to be aligned with the pump  2200 , and not the entire transmission  2110 . 
     Specific embodiments for some components of the device  2000  are described below. It should be highlighted that such embodiments should be considered examples, and that alternative embodiments may be created. It shall also be clear that components from different embodiments may be combined. 
       FIG. 3A  provides a schematic illustration of a section view of parts of a pump  3200  for a device for discharging a pressurised liquid  2000 , according to an embodiment of the present invention.  FIGS. 3B-3E  provide a schematic illustration of section views of the pump illustrated in  FIG. 3A , taken along the ZY plane passing through the section lines B, C, D and E illustrated in  FIG. 3A , respectively. The pump  3200  represents a possible embodiment of the pump  2200 , with the advantages described below. It shall nevertheless be clear that, in some embodiments, any pump  2200  may be used. 
     The pump  3200  comprises a cam  3210 , comprising an input shaft  3211  and having an inclined asymmetric plate  3212 . As can be seen, as the input shaft  3211  rotates, the asymmetrical surface of the asymmetric inclined plate  3212  alternately and continuously interspaces the maximum and minimum thickness position of the plate  3212  itself. The rotation of the cam  3210  can be facilitated by the presence of bearings  3213 . The alternating movement of the asymmetric inclined plate  3212  causes the piston  3220  to move along the X axis, as shown by the arrow A, inside a cylinder  3230 . While the cam  3210  causes the movement in the positive X direction, the movement in the negative X direction can be ensured by an elastic element  3221 , for example a spring. Alternatively, or in addition, the movement in the negative X direction can be obtained from the pressure of the liquid, in the event that the liquid is taken from a source which is under pressure, for example a tap. 
     Although not illustrated, the asymmetric inclined plate  3212  may have more than one section of minimum thickness and one of maximum thickness within a 360-degree arc. In this manner it will be possible to move the piston  3220  multiple times with a single rotation of the asymmetric inclined plate  3212 , thus providing an advantageous reduction in the number of rotations required of the motor. In addition, or alternatively, in some embodiments, by introducing a plurality of sections of minimum and maximum thickness within the 360-degree arc, it will also be possible to make the piston smaller, as it will be actuated multiple times during a single rotation of the asymmetric inclined plate  3212 , thus making the pump  3200  more compact. 
     The liquid from the intake section  2400  moves through an intake line  3410  until it reaches a distribution duct  3411 , in which the liquid travels from the lower to the upper part of the pump  3200 , as shown in  FIG. 3C . The distribution duct  3411  extends to the outside of the pump body. This characteristic not only allows the liquid to be distributed from one side of the pump body to the other, but also provides uniform cooling of the pump body. In some embodiments, the dimension along the X axis of the distribution duct  3411  may be increased as required with respect to the illustrated embodiment, in order to provide an advantageous increase in cooling. 
     From the distribution duct  3411 , the liquid then flows through an intake valve  3250  which may be, for example, a check valve, a mechanically or hydraulically controlled valve, or any type of valve which allows the entry of the liquid into the compression chamber  3240  during the intake phase and prevents it from coming out during the compression phase. Following the compression performed by the piston  3220 , the liquid is pushed out of the compression chamber  3240  through an outlet valve  3251  which may be, for example, a check valve, a mechanically or hydraulically controlled valve, or any type of valve which allows the outlet of the liquid from the compression chamber  3240  during the compression phase and prevents it from coming in during the intake phase. Once it has exited the compression chamber  3240 , the pressurised liquid finds itself in an outlet chamber  3260  with at least one outlet opening  3261  which allows the pressurised liquid to be transferred to the lance  2300 , if necessary after passing through other elements which will be described below. 
     As can be seen in  FIG. 3D , the valves  3250  and  3251  are radially positioned in the body of the pump  3200 . This allows better management of the pressure generated in the compression chamber  3240 . In general, as a matter of fact, as the two valves  3250 ,  3251  are arranged radially, the pressure exerted by the liquid on the valves  3250 ,  3251  tends to push the valves in a radial direction. If the valves were instead arranged longitudinally, along the X axis, for example, the thrust applied by the pressurised liquid would be along this direction. The fact that the thrust on the two valves  3250 ,  3251  is in the radial direction facilitates the construction of the pump. Specifically, this arrangement prevents the pressure on the valves pushing them in the direction of the lance  2300 , which would require a particularly thick support surface between the pump and the lance in order to prevent deformation. On the contrary, with the two valves being pushed in a radial direction, the support surface of the valves  3250 ,  3251  can be provided by substantially radial ribs  3253  on which the valves  3250 ,  3251  rest. Alternatively, or in addition, the radial positioning of the valves  3250 ,  3251  allows the dimensions of the pump  3200  to be reduced, particularly in the X direction. Moreover, the radial positioning of the two valves allows a star configuration to be implemented when a plurality of pistons  3320  are used, in which the intake valves  3250  take on an advantageous radial positioning in connection with the ring formed by the distribution duct  3411 , and/or the outlet valves  3251  take on an advantageous radial positioning in connection with the outlet chamber  3260 . 
     In addition, in some embodiments, it will be possible to connect a safety valve  3252  to the outlet chamber  3260 . In so doing, it is possible to ensure that, in the presence, for example, of blockages along the lance  2300 , the pump  3200  is not blocked and/or excessive liquid pressure is avoided. The safety valve  3252 , for example a check valve with opening pressure slightly greater than the maximum operating pressure of the pump, can discharge both outside the pump  3200  and, as shown, into a return line  3412  connected to the distribution duct  3411  and/or the intake line  3410 . 
     Via the described pump  3200  it is possible to pressurise the liquid taken in by the intake section  2400 . Specifically, it is both possible to increase the pressure of a liquid taken from, for example, a tap, and to pump and pressurise a liquid from a container which is not under pressure, for example a swimming pool, a tank etc. 
     The pump  3200  is particularly advantageous as it allows the use of rotational motion from the input shaft  3211 , thus simplifying the coupling of the pump  3200  with a motor  2100 , positioned substantially along the X direction with respect to the pump and/or as it provides an outlet to the liquid under pressure also substantially along the X axis with respect to the pump. In other words, the pump  3200  allows the lance  2300  and the motor  2100  to be connected in the same direction, such as to extend the device  2000  essentially along the X axis. Alternatively, or in addition, it is sufficient for the power take off on the motor  2100  to be essentially in line with the input shaft  3211 , in order to facilitate coupling of the two elements. In some cases, for example, the motor  2100  could be carried on the operator&#39;s shoulder and the transmission to the device  2000  could be flexible. 
     As previously described, the present invention is not limited to this embodiment and any pump capable of pressurising a liquid present in or which can be drawn by the intake section  2400  via suction can be used to implement the pump  2200 . Possible additions and/or alternatives to the pump  3200  are, for example, illustrated in  FIGS. 4 and 5 . 
       FIG. 4  provides a schematic illustration of a section view of parts of a pump  4200 . The pump  4200  differs from the pump  3200  in the cam  4210  which replaces the cam  3210 . The cam  4210  differs specifically due to the presence of a rolling element  4220 , for example a bearing or rollers, in the region of the asymmetric inclined plate  4212  in contact with the piston  3200 . In this manner it is possible to reduce operational frictions. Alternatively, or in addition, it will be possible to apply the rolling element  4220  to the piston  3220 . This latter solution is particularly advantageous in the event that the asymmetric inclined plate  4212  does not have a flat surface, for example in the presence of a plurality of sections of minimum thickness and sections of maximum thickness within the 360-degree arc. 
       FIG. 5  provides a schematic illustration of a section view of parts of a pump  5200 . The pump  5200  differs from the pump  3200  due to the presence of three pistons  5220 A-C instead of a single piston  3220 . The number of pistons, three in the example, which can be implemented is not limited. It shall also be clear that the characteristics of the pumps  3200  and/or  4200  and/or  5200  may, in some embodiments, be combined. 
       FIG. 6A  provides a schematic illustration of a section view of parts of a device  2000  and a motor  2100  for discharging a pressurised liquid. As can be seen in the figure, the device  2000  has a pump body  6270  open on the side of the input shaft  3211 . The motor  6100 , which represents a possible embodiment of the motor  2100 , has an output shaft  6120  and a motor body  6130  open on the side of the output shaft  6120 . In this manner the device  2000  and the motor  6100  can be connected, as shown in  FIG. 6B , or disconnected, as illustrated in  FIG. 6A , by coupling and decoupling the motor body  6130  and the pump body  6270 , resulting in coupling and decoupling of the output shaft  6120  and input shaft  3211 . The input and output shafts  6120 ,  3211 , may be shaped in various manners, with complementary shapes, in order to allow transmission of power from the motor  2100  to the pump  2200 . 
     The coupling and decoupling described allow, for example, a motor or engine for multiple gardening tools to be used as the motor  6100 , for example the motor for a chainsaw, a string trimmer, a leaf blower, or other gardening/DIY tools. More generally, the coupling and decoupling described allow the connection of any motor able to be connected to the pump body and transmit power to the input shaft. This makes the device  2000  particularly low cost, as it can be manufactured and sold without a dedicated motor, as part of a set of DIY/gardening tools which share a single electric motor or internal-combustion engine. 
     To avoid accidental uncoupling of the motor body  6130  from the pump body  6270 , various locking systems are available, two of which are shown as an example in  FIGS. 7A and 7B . Specifically,  FIGS. 7A and 7B  provide a schematic illustration of a section view of parts of devices for locking the connection between the pump and the motor of a device for discharging a pressurised liquid.  FIG. 7A  provides a schematic illustration of a device for aligning and/or positioning and/or locking  7272 , for example a button, held in position by an elastic device  7271 , for example a spring. 
     The locking device is solidly affixed to the pump body  7270  and extends through a dedicated hole in the engine body  7130 , or vice versa. In this manner it is possible to ensure that the coupling of the pump body  7270  and the motor body  7130  is locked. 
     In addition, or alternatively, a locking device  7150 , for example a ring positioned around the outermost of the motor body and pump body  7130 ,  7270 , allows the locking device to be squeezed tight, for example via a screw (not shown), preventing the two bodies from sliding against each other due to the friction generated by the locking device  7150 . These embodiments shall be considered non-binding examples of how a reliable coupling between the motor  2100  and device  2000  can be obtained, in the event that the motor can be coupled to and uncoupled from the device  2000  for discharging pressurised liquid. 
     In the two examples illustrated, the parts of the motor body  7130  and the pump body  7270  which are joined together represent a possible embodiment of the transmission  2110 . It shall also be clear that the transmission  2110 , in some embodiments, may advantageously be longer than that illustrated, particularly along the X axis, thus moving the motor  2100  away from the device  2000 . 
     In some embodiments, the motor  2100  may be an integral part of the device  2000  for discharging a pressurised liquid, as illustrated for example in  FIG. 8  where the motor  2100  is enclosed inside the pump body  8270 . 
     In both cases, whether the motor  2100  can or cannot be separated from the device  2000 , it is possible to include a motor control device  9140  in the device  2000 , in the motor  2100  or in the transmission  2210 , as illustrated schematically in  FIG. 9 . This allows the discharge power of the liquid to be controlled, from a minimum value, which can even be zero, to a maximum value, by directly controlling the motor power. This solution provides various advantages. Firstly, the motor does not operate when pressure is not requested, reducing power consumption. In addition, there is no risk of leaks due to internal liquid pressure which cannot find an outlet. Furthermore, while the modulation of a liquid under pressure is generally difficult to control, and requires a certain pressure on the modulation device by the user, the operation of a motor control device  9140 , for example a potentiometer connected to a button, or else a throttle control for an internal combustion engine, does not require any effort and can be easily modulated. It should be clear that, in the case of a motor  2100  which can be decoupled from the device  2000 , it will be possible to implement the control device  9140  on the device  2000  and/or on the motor  2100 , where necessary by providing for an electrical or mechanical connection between the device  2000  and the motor  2100  to transfer the control movement and/or signal. In other embodiments, it will be possible to directly modulate the discharge of the liquid. Despite the disadvantages listed above, this solution has the advantage of being easier and more economical to implement. 
     In  FIG. 9 , a handle  9600  in addition or in alternative is illustrated which facilitates the grip on the device  2000 . For example, the device could be gripped with one hand on the handle  9600  and one hand on the lance  2300 , or on a handle (not shown) installed in the area of the lance  2300 . 
     After the liquid has been pressurised, it can be discharged directly by a lance  2300 , or it can pass through a mixing section and/or an outlet check valve. These elements shall be described with reference to  FIGS. 10 and 14 . 
     Specifically,  FIG. 10A  illustrates a schematic section view of parts of a discharge lance  2300  comprising a discharge nozzle  2310 . In the simplest embodiment, the lance  2300  is essentially a tubular element with one end connected to the outlet  3261  of the pump  3200  and the other end holding the discharge nozzle  2310 . The extension along the X axis allows the jet  1005  to be oriented. The specific form of the nozzle  2310  allows the form of the jet  1005  to be controlled, in a manner known from prior art. 
     Alternatively, or in addition, as shown in  FIG. 10A , it is possible to insert an outlet check valve  10254  downline of the outlet opening  3261 . In an initial embodiment, the outlet check valve  10254  is normally closed and has an opening pressure greater than that of a pressurised liquid supply, for example from a tap, for example of 3 or 4 bar. When the device is connected to a pressurised source, a pressure increase can be obtained from the pump  2200 , which therefore opens the outlet check valve  10254 . On the contrary, when the pump  2200  is not operating, the pressure of the supply will not be enough to open the outlet check valve  10254 , thus preventing the simple pressure of the liquid supply causing it to flow out uncontrolled from the lance  2300 . In some embodiments of the invention the outlet check valve  10254  described above may also be used instead of the outlet valve  3251 . 
     In an alternative embodiment, illustrated in  FIGS. 10B and 10C , the outlet check valve  10254  has different operating positions, which can be set via a control lever  10256 . Specifically, when the control lever is in the position shown in  FIG. 10B , an eccentric element  10258  positioned on its upper edge acts on a shutter  10257 , pushing it in the positive direction of the X axis against the force exerted by the elastic device  10255 , for example a spring. In this position, valve  10254  is open. This configuration can be used, for example, in liquid suction mode, in which the liquid supply is not under pressure. In this mode there are no losses of power and reactivity due to the necessary opening of the pump. Furthermore, in this mode it is also possible to discharge liquids at low pressure. Finally, opening of the valve  10254  makes it possible for the pump to draw liquid via suction. As illustrated in  FIG. 10C , if the lever  10256  is moved in the opposite direction, the eccentric element  10258  allows the shutter  10257  to move in the negative direction along the X axis, under the thrust provided by the elastic element  10255 . In this position the valve  10254  is closed and held in position by the elastic element  10255 . This configuration can, for example, be used in the case that the liquid supply is taken from a pressurised source. In this case, the thrust of the elastic element  10255  may be calibrated to prevent the liquid from opening the valve under the pressure provided by the source, but to allow the liquid to open the valve under the pressure provided by the pump  2200 . In this manner, an undesired outflow of the liquid is prevented when the user does not operate the pump  2200 . Although the valve  10254  has been shown as operated by a lever  10256  and an eccentric element  10258 , it should be clarified that other embodiments making use of, for example, levers, cams, thrust screws and so on may be used as an alternative. 
     In the embodiment shown in  FIG. 10A , the lance  2300  is directly connected to the outlet of the pump  2200 , possibly via the outlet check valve  10254 . In other embodiments, the lance  2300  may be installed downline of a mixing section  11300 ,  12300 ,  13300 , which may be incorporated in the body of the pump  2200 , as described below. Although not illustrated, for clarity it should be specified that the outlet check valve  10254  may be incorporated in any described embodiment, in particular upline or downline of the mixing section. In these embodiments it shall therefore be understood that the connection between the pump  2200  and the lance  2300 , made in a substantially solid manner, is downline of the mixing section and/or the outlet check valve  10254 . 
     The mixing section  11300  in  FIG. 11  comprises a mixing hole  11710 , communicating with a liquid  11720  contained in a tank  11700 . The liquid  11720  is not the liquid pressurised by the device  2000 . For example, the liquid pressurised by the device  2000  may be water, while the liquid  11720  may be a detergent, in the case of a pressure washer, or a fertiliser in the case of a sprayer, or more generally a liquid for use with plants, for example a weedkiller or fertiliser. The mixing hole  11710  allows the pressurised liquid, for example water, to be mixed with the liquid  11720  inside the mixing section  11300 . 
     The tank  11700  may be positioned substantially above the mixing section  11300 , as illustrated, and/or above the entire pump  2200  as shown for example in  FIG. 15 , and/or above the lance  2300 . This flexibility of positioning allows the weight of the device  2000  to be balanced. In other embodiments, the tank  11700  may be positioned anywhere in the device  2000  and may be connected to the mixing hole  11710  via a dedicated line. Moreover, as illustrated, the tank  11700  may be structurally integrated in the pump body, or it may be an element which can be separated and connected to the pump body, as shown for example in  FIG. 16 . 
     The mixing section  12300  in  FIG. 12  differs from the mixing section  11300  in that the mixing hole  12710  is shaped in such a way as to work in tandem with a mixing control device  12730 . In the illustrated embodiment, the mixing control device is a pin control with a substantially conical section, which can be inserted inside the hole  12710  to a controlled depth on the basis of the movement provided by the rotation of a threaded knob or similar. In this manner it is possible to control the quantity of liquid  11720 , from zero to maximum, mixed with the pressurised outlet liquid. 
     In the two embodiments of the mixing section  11300 ,  12300 , the mixing occurs by simple gravity feed of the liquid  11720  through the hole  11710 ,  12710 . This operation is possible in the case that the pressure inside the mixing section  11300 ,  12300  is not too high, for example in the case that the device  2000  is used as a low-pressure sprayer. In high-pressure situations, however, the mixing is prevented by the tendency of the pressurised liquid to enter the tank  11700 .  FIG. 13  provides a schematic illustration of a solution which allows mixing even in the case of high-pressure discharge. 
     Specifically, the mixing section  13300  illustrated in  FIG. 13  differs from the mixing section  12300  due to the presence of a Venturi tube  13320 . The narrowing of the Venturi tube causes a localised pressure drop at the mixing hole, which allows the liquid  11720  to be mixed even in the presence of high pressure in the mixing section  13300 . In other embodiments, given that the mixing is performed by the effect of the pressure drop generated by the Venturi tube  13320 , it will be possible to position the tank  11700  below the mixing section  13300  as well. In addition, in some embodiments, the mixing section  13300  may include a valve  13330 . The valve  13330  is illustrated schematically in the figure as a ball valve, possibly held in position by an elastic element; in any case, all embodiments of a check valve for the liquid  11720  will be possible. In the presence of the valve  13330 , the mixing section  13300  will allow mixing of the liquid  11720  in low-pressure mode, for example for low-pressure washing in pressure-washer mode. When switched to high-pressure mode, valve  13330  closes, blocking mixing and preventing entry of the pressurised liquid into the tank  11700 . It will also be possible to implement a mixing hole without any non-return valve. 
     As previously described, the mixing sections  11300 ,  12300 ,  13300  will be advantageously incorporated in the body of the pump  2200 . In possible variants of the present invention, in any case, the mixing sections  11300 ,  12300 ,  13300  may also be incorporated in the body of the lance  2300 , where necessary by moving the tank  11700  onto the body of the lance  2300  and/or incorporating it in the same. As another alternative, the tank  11700  may be positioned on, or incorporated in, the body of the pump  2200  and connected via a hose to a mixing section  11300 ,  12300 ,  13300  implemented in the lance  2300 , or vice versa. It should also be clarified that the lance  2300  in  FIGS. 10-13  is schematically illustrated as structurally connected to the body of the pump and/or the mixing section  11300 ,  12300 ,  13300 . This representation is provided purely as an example, and the connection of the lance  2300  to these elements may be performed with screws, by interlocking coupling in a dedicated seat, or with joints, for example one of the unions  2800 .  2801  described above. 
       FIG. 14A  illustrates a schematic section view of parts of a configurable discharge lance  14300  for a device  2000 .  FIGS. 14B and 14C  illustrate schematic section views of the discharge lance shown in  FIG. 14A  according to the section lines B and C. The lance  14300  has a plurality of discharge nozzles  14310 ,  14311 , for example a low-pressure nozzle  14310  and a high-pressure nozzle  14311 . The choice of the various nozzles can be made by rotating a mobile part  14350 , on which the nozzles are installed, against a fixed part  14340 , connected to the pump  2200 , as in the case of the lance  2300 . In some optional embodiments, movement of the mobile part  14350  against the fixed part  14340  can be facilitated by one or more rotational elements  14360 , for example bearings or simple rings, even solid ones. The fixed part contains an opening  14341  on the side of the pressurised liquid discharge, on which one of the openings  14351 A,  14351 B of the mobile part  14350  can be alternately positioned. In this manner it is possible to choose which discharge nozzle to use. The various discharge nozzles may have known forms for controlling the type of discharge required. In the illustrated embodiment, as an example, the high-pressure nozzle  14311  has a smaller discharge opening in comparison to the low-pressure nozzle  14310 . In this manner, for example, it is possible to control the outlet pressure even with a pump able to operate only at a single speed. 
     It is then described how different embodiments can be performed and, where necessary, combined, in order to create a pressurised liquid discharge device  2000 , for example a pressure washer and/or sprayer, with facilitated use and/or lower weight and/or lower cost. 
     As described, in some embodiments the device  2000  can be fitted with a mechanical device which can be adapted to external power generators such as, by way of non-limiting example, electric or petrol string trimmers, electric motors or internal combustion engines in general, or any type of power take off available, for example tractors, farm machinery etc. In addition, or as an alternative, in some embodiments the device may be equipped with a multi-way discharge lance, which it may be possible to select according to the required use. In addition, or as an alternative, in some embodiments the device may be equipped with a tank in which various types of substances such as detergents or various other chemical products can be held to be discharged by the lance together with the pressurised liquid (e.g. water). The supply of the liquid, for example water, can be assured, in the event of necessity, by drawing via suction from an available nearby water source, for example a generic irrigation channel or siphon, as shown in  FIG. 17 . 
     Further possible embodiments of the device  2000  shall be described in relation to  FIGS. 15-17 . Specifically,  FIG. 15A  illustrates a schematic section view along the XY plane of a further possible embodiment of the device  2000 , according to an embodiment of the present invention.  FIG. 15B  illustrates a schematic section view along the ZY plane taken along the line A-A of  FIG. 15A .  FIGS. 16A and 16B  illustrate simplified schematic three-dimensional exploded views of the main components of the device  15000 .  FIG. 17  represents a possible operating scheme with the water supply drawn via suction by the device in  FIG. 15  or  FIGS. 16A, 16B . 
     The device illustrated in  FIG. 15  comprises a connection for the liquid (generally water) supply line, a pressure generator, possibly high pressure, and in some embodiments a liquid tank. The liquid tank may be firmly attached to the tank and/or a lance, possibly multi-way, from which a liquid jet used for the purpose of the device is discharged. As partly completed machinery, it is able to provide a very specific application simply by applying an external power source supplied, for example, by the motor of a string trimmer through the rotational motion of an element inside the stem appropriately fitted with a joint to house other partly completed machinery and provide other very specific applications. 
     Specifically, the device in  FIG. 15  comprises, or is composed of, a main shaft  15001 , similar to the input shaft  3211  which is connected to the power take off on the energy source  15035 , which could be, for example, the output shaft  6120 , mounted on bearings  15002 , similar to the bearings  3213 , rolling or sliding. This shaft  15001  is rigidly connected to an inclined disc rotor  15003 , similar to the cam  3210 , supported by an axial bearing  15004 , rolling or sliding, with the function of transforming the rotary motion of the main shaft  15001  into linear motion of one or more pistons  15005 , similar to the piston  3220 . 
     These pistons  15005  are moved during the active phase by the inclined disc rotor  15003  via an axial bearing  15006 , similar to the rolling element  4220 , rolling or sliding, and during the return phase by springs  15007  connected to it via circlips  15008 , where the springs  15007  and circlips  15008  perform a function similar to that of the elastic device  3221 . The pistons  15005  are housed inside guides  15009 , similar to the cylinder  3230 , and slide on gaskets  15010  required to keep the lubricant inside the pump body  15011 , similar to the pump body  6270 ,  7270  or  8270 . Each piston  15005  acts in the compression chamber  15012 , in which liquid leakage is prevented by gaskets  15013 , and each of them is connected to a check valve  15014 , similar to the intake valve  3250 , which regulates the intake phase, and a check valve  15015 , similar to the outlet valve  3251 , which regulates the outlet phase. The intake check valve  15014  is connected to the intake circuit  15016 , with a function similar to the ducts  3410  and  3411 , to which the water supply line  15017 , similar to the hose  2500 , is connected from the mains water supply or a tank. 
     The outlet check valve  15015  is connected to the outlet circuit  15018 , similar to the outlet chamber  3260 , and to the four-function washing lance  15019 , with operation similar to the lance  14300 . During the intake phase, in other words the return of the pistons  15005  due to the effect of the springs  15007 , the liquid enters the compression chamber  15012  through the intake check valves  15014 . During the outlet phase, in other words the forward stroke of the pistons  15005  caused by the action of the inclined disc  15003  rotor  15001 , the liquid is driven into the compression chamber  15012  and then enters the outlet circuit  15018  through the outlet check valves  15015 . After entering the outlet circuit  15018 , the liquid passes through a Venturi tube  15020 , similar to the Venturi tube  13320 , connected to the detergent or chemical additive tank  15022  similar to the tank  11700 , possibly via a check valve  15026 , similar to the valve  13330 , which prevents water entering the tank  15022  when operating under high pressure, while allowing mixing in low-pressure operation. 
     By selecting the low-pressure nozzle  15023  on the washing lance  15019 , the Venturi tube  15020  generates a pressure drop in the detergent tank  15022  which causes the detergent to mix with the wash liquid, in a quantity which can be regulated via the adjustment screw  15024  with a function similar to that of the mixing control device  12730 . The detergent tank  15022  is fitted with a filler cap  15025  with a vent hole or check valve to allow it to equalise with atmospheric pressure and ensure a regular flow of the detergent or chemical additive. 
     Upline of the Venturi tube  15020  is an outlet check valve  15021 , similar to the outlet check valve  10254 , which prevents the leakage of water from the washing nozzles  15023 ,  15027 ,  15028 ,  15029  of the washing lance  15019  when connected to the mains water supply and the power supply is disconnected. Downline of the Venturi tube  15020  the water reaches the distributor disc  15031  via the central line  15030 . 
     Rotating the washing lance  15019  connects one of the four ducts of the nozzles body  15032  via seal rings  15033 . At the end of each of the ducts on the nozzles body  15032  the washing nozzles  15023 ,  15027 ,  15028 ,  15029  are attached; these have different characteristics, specifically the low-pressure fan jet nozzle  15023 , similar to nozzle  14310 , the high-pressure narrow-angle nozzle  15027 , similar to nozzle  14311 , the high-pressure fan jet nozzle  15028  and the rotating high-pressure nozzle with a conical jet  15029 . The washing lance  15019  is fitted with a spring device  15036  able to recognise and correctly position the nozzles body  15032  with the ducts perfectly aligned with the distributor disc  15031 . Connected between the outlet circuit  15018  and intake circuit  15016  is a safety valve  15034 , similar to the safety valve  3252 , to prevent any damage due to unexpected overpressures. 
     Moreover, an embodiment of the present invention can refer to an interchangeable device equipped with a high-pressure pump unit  16002 , with a function similar to the pump  2200 , water intake  16003 , with a function similar to the intake section  2400 , optionally a liquid tank  16004 , with a function similar to the tank  11700 , lance  16005 , with a function similar to the lance  2300  and embodiment similar to the lance  14300  and/or the lance  15019 , characterised in that it is equipped with a connection system comprising or composed of shaped shaft coupling  16001 , similar to the end of the pump body  6270  on the motor side, and shaped hub  16007 , with a function similar to the output shaft  6120 , an anti-rotation positioning element  16008 , with a function similar to the alignment and/or positioning and/or locking device  7272 , a locking clamp  16009 , with a function similar to the locking device  7150 , which permits the coupling to a power generator of various type  16006 , with a function similar to the motor  2100  or transmission  2110 , transforming the whole assembly into a pressure washer and or (high-pressure) sprayer. 
     A further embodiment may refer to a device according to the previous embodiment, characterised by the fact that the multi-way lance has no flexible hose and is directly connected to a structure composed of a connection for the water line  16003 , high-pressure generator  16002  and liquid tank  16004 . 
     A further embodiment may refer to a device according to one of the two previous embodiments, characterised by the fact that the water supply  16003  may also be provided by drawing via suction from generally available water by the vacuum generated in the compression chamber of the pump assembly  16002 . 
     A further embodiment may refer to a device according to one of the previous embodiments, characterised by the fact that its operation depends on a single fixed connection comprising only the water supply. 
     A further embodiment may refer to a device according to one of the previous embodiments, characterised by the fact that by rotating the lance  16005  it is possible to select the geometry of the outlet jet: rotating high-pressure conical jet nozzle  15029 , high-pressure narrow angle nozzle  15027 , high-pressure fan jet nozzle  15028 , low-pressure fan jet nozzle  15023 . 
     The previous description generally makes reference to a motor  2100 . The motor  2100  may be an electrical motor, an internal combustion engine, or any other kind of motor. In the case of an internal combustion engine, the elements schematically represented as the motor  2100  may include the engine itself and the fuel tank. In the same way, in the case of a battery-powered electric motor, the elements schematically represented as the motor  2100  may include both the motor and the battery. 
     While the present invention has been previously clarified by means of the detailed description of some of its embodiments represented in the drawings, the present invention is not limited to the embodiments described above and represented in the drawings; on the contrary, further variants of the embodiments described fall within the scope of the present invention as defined by the claims. 
     Furthermore, further embodiment variants may feature appropriate combinations of the previously described solutions with reference to the various embodiments. In particular, individual elements of each embodiment described may be combined with individual elements of any other embodiment described. 
     
       
         
           
               
             
               
                   
               
               
                 List of reference numbers 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 1000: 
                 Pressure washer 
               
               
                   
                 1001: 
                 Body 
               
               
                   
                 1002: 
                 Wheels 
               
               
                   
                 1003: 
                 Flexible hose 
               
               
                   
                 1004: 
                 Lance 
               
               
                   
                 1005: 
                 Jet 
               
               
                   
                 1006: 
                 Motor-pump assembly 
               
               
                   
                 1007: 
                 Liquid container 
               
               
                   
                 2000: 
                 Device for the discharge of a pressurised liquid 
               
               
                   
                 2100: 
                 Motor 
               
               
                   
                 2110: 
                 Transmission 
               
               
                   
                 2300: 
                 Discharge lance 
               
               
                   
                 2310: 
                 Discharge nozzle 
               
               
                   
                 2400: 
                 Intake section 
               
               
                   
                 2500: 
                 Flexible hose 
               
               
                   
                 2800: 
                 Rotating joint 
               
               
                   
                 2801: 
                 Ball joint 
               
               
                   
                 2802: 
                 Sliding joint 
               
               
                   
                 2803: 
                 Fastening element 
               
               
                   
                 2804: 
                 Interlocking coupling 
               
               
                   
                 3200: 
                 Pump 
               
               
                   
                 3210: 
                 Cam 
               
               
                   
                 3211: 
                 Input shaft 
               
               
                   
                 3212: 
                 Asymmetric inclined plate 
               
               
                   
                 3213: 
                 Bearing 
               
               
                   
                 3220: 
                 Piston 
               
               
                   
                 3221: 
                 Elastic device 
               
               
                   
                 3230: 
                 Cylinder 
               
               
                   
                 3240: 
                 Compression chamber 
               
               
                   
                 3250: 
                 Intake valve 
               
               
                   
                 3251: 
                 Outlet valve 
               
               
                   
                 3252: 
                 Safety valve 
               
               
                   
                 3253: 
                 Ribs 
               
               
                   
                 3260: 
                 Output chamber 
               
               
                   
                 3261: 
                 Outlet 
               
               
                   
                 3410: 
                 Intake line 
               
               
                   
                 3411: 
                 Distribution duct 
               
               
                   
                 3412: 
                 Return duct 
               
               
                   
                 4200: 
                 Pump 
               
               
                   
                 4210: 
                 Cam 
               
               
                   
                 4212: 
                 Asymmetric inclined plate 
               
               
                   
                 4220: 
                 Rolling element 
               
               
                   
                 52000: 
                 Pump 
               
               
                   
                 5220A-C: 
                 Piston 
               
               
                   
                 5200: 
                 Pump 
               
               
                   
                 5220A: 
                 Piston 
               
               
                   
                 5220B: 
                 Piston 
               
               
                   
                 5220C: 
                 Piston 
               
               
                   
                 6100: 
                 Motor 
               
               
                   
                 6120: 
                 Output shaft 
               
               
                   
                 6130: 
                 Motor body 
               
               
                   
                 6270: 
                 Pump body 
               
               
                   
                 7270: 
                 Pump body 
               
               
                   
                 7271: 
                 Elastic device 
               
               
                   
                 7272: 
                 Alignment and/or positioning and/or locking device 
               
               
                   
                 7150: 
                 Locking device 
               
               
                   
                 8270: 
                 Pump body 
               
               
                   
                 9140: 
                 Motor control device 
               
               
                   
                 9600: 
                 Handle 
               
               
                   
                 10254: 
                 Outlet check valve 
               
               
                   
                 10255: 
                 Elastic device 
               
               
                   
                 10256: 
                 Control lever 
               
               
                   
                 10257: 
                 Shutter 
               
               
                   
                 10258: 
                 Eccentric element 
               
               
                   
                 11300: 
                 Mixing section 
               
               
                   
                 11700: 
                 Tank 
               
               
                   
                 11710: 
                 Mixing hole 
               
               
                   
                 11720: 
                 Liquid 
               
               
                   
                 12300: 
                 Mixing section 
               
               
                   
                 12710: 
                 Mixing hole 
               
               
                   
                 12730: 
                 Mixing control device 
               
               
                   
                 13300: 
                 Mixing section 
               
               
                   
                 13320: 
                 Venturi tube 
               
               
                   
                 13330: 
                 Valve 
               
               
                   
                 14300: 
                 Discharge lance 
               
               
                   
                 14310: 
                 Low-pressure discharge nozzle 
               
               
                   
                 14311: 
                 High-pressure discharge nozzle 
               
               
                   
                 14340: 
                 Fixed part 
               
               
                   
                 14341: 
                 Fixed part opening 
               
               
                   
                 14350: 
                 Mobile part 
               
               
                   
                 14351A: 
                 Mobile part opening 
               
               
                   
                 14351B: 
                 Mobile part opening 
               
               
                   
                 14360: 
                 Rotational elements 
               
               
                   
                 15001: 
                 Main shaft 
               
               
                   
                 15002: 
                 Bearings 
               
               
                   
                 15003: 
                 Inclined disc rotor 
               
               
                   
                 15004: 
                 Axial bearing 
               
               
                   
                 15005: 
                 Piston 
               
               
                   
                 15006: 
                 Axial bearing 
               
               
                   
                 15007: 
                 Piston return springs 
               
               
                   
                 15008: 
                 Circlips 
               
               
                   
                 15009: 
                 Guide 
               
               
                   
                 15010: 
                 Lubrication gaskets 
               
               
                   
                 15011: 
                 Pump body 
               
               
                   
                 15012: 
                 Compression chamber 
               
               
                   
                 15013: 
                 Water gaskets 
               
               
                   
                 15014: 
                 Intake valve 
               
               
                   
                 15015: 
                 Outlet valve 
               
               
                   
                 15016: 
                 Intake circuit 
               
               
                   
                 15017: 
                 Supply line 
               
               
                   
                 15018: 
                 Outlet circuit 
               
               
                   
                 15019: 
                 Washing lance 
               
               
                   
                 15020: 
                 Venturi tube 
               
               
                   
                 15021: 
                 Outlet check valve 
               
               
                   
                 15022: 
                 Detergent tank 
               
               
                   
                 15023: 
                 Fan jet low-pressure nozzle 
               
               
                   
                 15024: 
                 Detergent adjustment screw 
               
               
                   
                 15025: 
                 Tank cap 
               
               
                   
                 15026: 
                 Detergent tank check valve 
               
               
                   
                 15027: 
                 Narrow angle high-pressure nozzle 
               
               
                   
                 15028: 
                 Fan jet high-pressure nozzle 
               
               
                   
                 15029: 
                 Rotating conical jet high-pressure nozzle 
               
               
                   
                 15030: 
                 Central Duct 
               
               
                   
                 15031: 
                 Distributor disc 
               
               
                   
                 15032: 
                 Nozzles body 
               
               
                   
                 15033: 
                 Sealing ring 
               
               
                   
                 15034: 
                 Safety valve 
               
               
                   
                 15035: 
                 Power take off 
               
               
                   
                 15036: 
                 Lance positioning spring 
               
               
                   
                 16001: 
                 Connection body 
               
               
                   
                 16002: 
                 Pump assembly 
               
               
                   
                 16003: 
                 Water intake 
               
               
                   
                 16004: 
                 Tank 
               
               
                   
                 16005: 
                 Lance 
               
               
                   
                 16006: 
                 External power take off 
               
               
                   
                 16007: 
                 Shaped hub 
               
               
                   
                 16008: 
                 Anti-rotation positioning element 
               
               
                   
                 16009: 
                 Locking clamp