HIGH-PRESSURE CLEANER

Description

[0001] The invention relates to a high-pressure cleaning device according to the preamble of claim 1.

[0002] WO 2016 / 102075 A1 discloses a high-pressure cleaning device in which the pressure in the pressure chamber of the high-pressure cleaning device can be adjusted in steps. For this purpose, an input unit is arranged on the gun of the high-pressure cleaning device. The input unit for the stepwise adjustment of the pressure is designed separately from an actuating lever, which serves to open a valve in the main line of the high-pressure cleaning device. Water can only be sprayed from the gun of the high-pressure cleaning device if this main line valve is opened by the operating lever. A pressure level is selected using the input unit, and then the main line valve is opened using the operating lever.Adjusting the pressure level while spraying fluid is inconvenient; the control lever is pressed with one finger while spraying, and either the other hand or the thumb is required to adjust the pressure. Operating the pressure washer with one hand is then difficult.

[0003] DE 10 2006 009 855 A1 discloses a high-pressure cleaning device according to the preamble of claim 1, in which a bypass with a bypass valve for adjusting the pump power can be provided. An input unit for inputting the motor power is arranged on an ejection unit. An opening valve in the ejection unit can be opened by means of an actuating lever.

[0004] EP 2 985 083 A1 discloses a high-pressure cleaning device with a user interface for pressure control, which is designed separately from the control element for operating the main valve.

[0005] DE 2004 031 951 B3 discloses a high-pressure cleaning device with a bypass line in which a spring-loaded overflow valve is arranged.

[0006] The invention is based on the object of developing a generic high-pressure cleaning device in such a way that a comfortable adjustment of the pressure is possible.

[0007] This object is achieved by a high-pressure cleaning device having the features of claim 1.

[0008] According to the invention, the main line valve prevents fluid from flowing through the main line when closed and allows fluid to flow through the main line when open. The main line valve can be switched between the open and closed states using the operating element. The main line has a suction chamber between the connection and the high-pressure pump. The main line has a pressure chamber between the high-pressure pump and the discharge opening. The pressure chamber is fluidically connected to the suction chamber via a bypass line. A bypass valve is arranged in the bypass line. To regulate the pressure in the pressure chamber, a free cross-sectional area of ​​the bypass line can be adjusted using the bypass valve.The larger the free cross-sectional area of ​​the bypass line, the greater the volume flow of cleaning fluid that can flow through the bypass line under otherwise unchanged conditions. Because the pressure in the pressure chamber is regulated by a bypass valve, the high-pressure cleaning device can be manufactured cost-effectively. The pressure is regulated completely independently of the type of motor used. Accordingly, a cost-effective motor can be used, while simultaneously allowing pressure regulation. This eliminates the need for costly motor speed control. Expensive measures such as the integration of a frequency converter or the implementation of phase-angle control can be avoided.

[0009] According to the invention, the bypass valve is adjustable by means of the control element to adjust the free cross-sectional area of ​​the bypass line. By operating the control element, the main line valve can be switched between the open and closed states, and the free cross-sectional area of ​​the bypass line can be adjusted by means of the bypass valve. This allows convenient adjustment of the pressure in the pressure chamber even while fluid is being ejected through the ejection opening. According to the invention, only a single control element is required to switch the main line valve between the open and closed states and to adjust the bypass valve.In particular, the high-pressure cleaning device is designed such that the actuation of the main line valve for switching the main line valve between the open state and the closed state and the actuation of the bypass valve for adjusting the bypass valve can be triggered by actuating the operating element by means of a continuous movement of a single finger, in particular one after the other.

[0010] In particular, the high-pressure cleaning device is designed in such a way that the control element must be continuously operated so that the main line valve is in the open state.

[0011] The high-pressure cleaning device has a hand-held ejection unit. The ejection opening is arranged on the hand-held ejection unit. The operating element is arranged on the hand-held ejection unit. This allows the ejection unit to be guided in order to direct a water jet emerging through the ejection opening onto a specific object, and at the same time, the pressure in the pressure chamber can be easily adjusted. The ejection unit expediently comprises a gun on which the operating element and ejection opening are arranged. It can be provided that the ejection unit is formed exclusively by the gun. However, it can also be provided that the ejection unit comprises a gun and a lance, and that the operating element is arranged on the gun and the ejection opening on the lance.

[0012] In particular, the hand-held ejection unit has a grip area. A user can expediently hold the hand-held ejection unit by grasping the grip area. Advantageously, the control element can be actuated with one of the user's fingers when the grip area is grasped. This makes it possible for the user to use one and the same finger to switch the main line valve between the open and closed state by actuating the control element and to adjust the free cross-sectional area of ​​the bypass line by actuating the bypass valve. This enables particularly comfortable use of the high-pressure cleaning device. In particular, the control element can be actuated without using the user's thumb when the grip area is grasped. The control element can expediently be actuated with a single finger, namely the index finger, the middle finger, the ring finger, or the little finger.

[0013] In an advantageous development of the invention, the high-pressure cleaning device comprises a detector designed to detect an adjustment position of the control element. In particular, the detector is designed to detect several different adjustment positions. In particular, the control element can be continuously adjusted to different adjustment positions within a range. The detector is expediently designed to detect any adjustment position within this continuous range.

[0014] The detector is preferably a potentiometer. In particular, the detector is a Hall sensor. This allows for precise detection of the adjustment position of the control element, especially within a range in which the control element can be continuously adjusted.

[0015] The high-pressure cleaning device is designed so that the bypass valve adjusts the size of the free cross-sectional area depending on the adjustment position of the control element. In particular, the size of the free cross-sectional area can be continuously adjusted using the control element. The combination of the continuous adjustability of the control element with the dual function of the control element for switching the main line valve and adjusting the bypass valve results in a dynamic operating behavior of the high-pressure cleaning device. The user of the high-pressure cleaning device can briefly increase the pressure in an extremely convenient way by moving the control element, which they must operate anyway to open the main line valve and spray water, to a different adjustment position.The control element can be adjusted to another adjustment position in particular by pressing the control element using a finger of the user.

[0016] The bypass valve is preferably adjustable using a servomotor. This allows the free cross-sectional area of ​​the bypass line to be conveniently adjusted. In particular, the bypass valve is adjustable using a signal triggered by the control element. The signal is preferably transmitted wirelessly. This minimizes the risk of cable breakage. However, the signal can also be transmitted via a cable.

[0017] The high-pressure cleaning device conveniently includes a motor to drive the high-pressure pump. In particular, the motor is an induction motor. In particular, the motor is a brushless DC motor. Combining pressure regulation via the bypass valve with an induction motor or a brushless DC motor enables the cost-effective use of these motor types. Thanks to the bypass valve, no speed control is required for pressure regulation for these motor types. This can result in significant cost savings. This also enables cost-effective manufacturing for high-pressure cleaning devices designed for a higher performance class.

[0018] In an advantageous development of the invention, the high-pressure cleaning device is designed such that, when the control element is not actuated, the bypass valve is adjusted so that the free cross-sectional area of ​​the bypass line is at its maximum. This allows the maximum possible pressure equalization between the pressure chamber and the suction chamber when the control element is not actuated. This minimizes the pressure applied to the main line valve. The high-pressure cleaning device is expediently designed such that, when the free cross-sectional area is at its maximum, the main line valve is switched from the closed to the open state by means of the control element before the free cross-sectional area of ​​the bypass line is reduced as a result of the control element. This ensures that the main line valve is opened before a pressure increase in the pressure chamber of the main line. This prevents excessive pressure from being applied to the main line valve.The main line valve can therefore be designed for much lower pressures, resulting in cost savings.

[0019] In particular, the high-pressure cleaning device is designed so that before the main line valve is moved from the (partially) open state to the (fully) closed state by means of the control element, the free cross-sectional area of ​​the bypass line is increased by means of the control element. This allows the high-pressure cleaning device to be designed so that the pressure in the pressure chamber is reduced before the main line valve is closed. This allows the main line valve to be designed for a lower load when closing.

[0020] In an advantageous development of the invention, the control element can be adjusted from a rest position in the unactuated state along a travel path into adjustment positions with increasing distance from the rest position. The high-pressure cleaning device is expediently designed such that the bypass valve reduces the free cross-sectional area of ​​the bypass line as the distance of the control element from the rest position increases. This enables dynamic pressure adjustment during operation of the high-pressure cleaning device, particularly while fluid is being sprayed through the spray opening. The user can continuously adjust the pressure simply by operating the control element. At the same time, they can keep the main line valve open simply by operating the control element. This combination enables intuitive operation of the high-pressure cleaning device.In areas that need to be cleaned with increased water pressure, the user can easily increase the pressure for a short time by pressing the control element harder and then reduce it again in other areas where a lower pressure of the cleaning fluid is required by reducing the distance of the control element from its rest position.

[0021] In particular, the high-pressure cleaning device is designed in such a way that the control element allows continuous adjustment of the pressure in the pressure chamber while liquid is being sprayed out of the spray opening.

[0022] Advantageously, the control element is a single component in which the functions of both the operation of the main line valve and the operation of the bypass valve are combined.

[0023] Embodiments of the invention are explained below with reference to the drawings. They show: Fig. 1 a schematic representation of a high-pressure cleaning device with unactuated control element and open bypass valve and Fig. 2 a schematic representation of the high-pressure cleaning device from Fig. 1 with actuated control element and closed bypass valve.

[0024] Fig. 1 shows a high-pressure cleaning device 1. The high-pressure cleaning device 1 comprises a pump unit 18 and an ejection unit 11. The pump unit 18 and the ejection unit 11 are fluidly connected to each other via a main line 5. In the exemplary embodiment, the ejection unit 11 consists of a gun. However, it can also be provided that the ejection unit comprises a gun and a lance.

[0025] The high-pressure cleaning device 1 includes a connection 2 for a fluid source 17. In the exemplary embodiment, the fluid source 17 is an external fluid source. In the exemplary embodiment, the external fluid source is the faucet of a domestic water supply. The fluid source can also be an integral part of the high-pressure cleaning device.

[0026] The high-pressure cleaning device 1 comprises an ejection opening 6. The high-pressure cleaning device 1 comprises the main line 5. The main line 5 of the high-pressure cleaning device 1 fluidically connects the connection 2 to the ejection opening 6. The connection 2 is arranged on the pump unit 18. The ejection opening 6 is arranged on the ejection unit 11. In the exemplary embodiment, the ejection opening 6 is arranged on the ejection unit 6, which is designed as a pistol. However, it can also be provided that the ejection opening is arranged on an exchangeable lance of the ejection unit.

[0027] The high-pressure cleaning device 1 comprises a high-pressure pump 3. By means of the high-pressure pump 3, liquid can be conveyed through the main line 5 from the connection 2 to the ejection opening 6. The liquid source 17 supplies liquid to the main line 5. The high-pressure pump 3 is arranged in the main line 5. The high-pressure pump 3 pressurizes the liquid. The high-pressure pump 3 is arranged between a suction chamber 9 and a pressure chamber 10 of the main line 5. The main line has the suction chamber 9 between the connection 2 and the high-pressure pump 3. The main line 5 has the pressure chamber 10 between the high-pressure pump 3 and the ejection opening 6. In the exemplary embodiment, the suction chamber 9 is formed by a section of the main line 5 between the connection 2 and the high-pressure pump 3. In the exemplary embodiment, the pressure chamber 10 is formed by a section of the main line 5 between the high-pressure pump 3 and the ejection opening 6.The high-pressure pump 3 pumps fluid from the suction chamber 9 to the pressure chamber 10. The pressure in the pressure chamber 10 is higher than in the suction chamber 9. The suction chamber 9 and the pressure chamber 10 are part of the main line 5. Downstream of the high-pressure pump 3, the pressure in the main line 5 is higher than upstream of the high-pressure pump 3.

[0028] The high-pressure pump 3 is arranged in the pump unit 18. The high-pressure pump 3 is designed separately from the ejection unit 11. Various ejection units can be connected to the high-pressure pump 3. The high-pressure cleaning device 1 has a motor 4 to drive the high-pressure pump 3. The motor 4 is arranged in the pump unit 18. The motor 4 can be designed as a brushless DC motor. A brushless DC motor is also referred to as an EC motor. The motor can also be a universal motor. In the exemplary embodiment, the motor 4 is an induction motor. In an induction motor, a rotating magnetic field of the stator sets the rotor in motion. The induction motor in the exemplary embodiment is operated with alternating current. The voltage source can be provided, for example, by the mains voltage.If battery operation is intended, the motor can also be a brushless DC motor. In this case, the battery can be included as part of the high-pressure cleaning device 1.

[0029] As in the Fig. 1 and 2 As shown, the high-pressure cleaning device 1 comprises a main switch 19. The main switch 19 serves to interrupt the power supply of the entire high-pressure cleaning device 1. The main switch 19 is arranged on the pump unit 18.

[0030] The high-pressure cleaning device 1 comprises a main line valve 8. The main line valve 8 is arranged in the main line 5. The main line valve 8 has two valve states. The two valve states include a closed state 20 ( Fig. 1 ) and an open state 40 ( Fig. 2 ). In the open state 40, the main line valve 8 allows liquid to flow through the main line. In the closed state 20, the main line valve 8 prevents liquid from flowing through the main line 5. In the open state 40 of the main line valve 8, liquid is sprayed out of the ejection opening 6. In the closed state 20 of the main line valve 8, no liquid is sprayed out of the ejection opening 6. In the exemplary embodiment, the main line valve 8 is arranged in the ejection unit 11. In the exemplary embodiment, the main line valve 8 is arranged between the high-pressure pump 3 and the ejection opening 6. However, it can also be provided that the main line valve is arranged in the pump unit. It can also be provided that the main line valve is arranged between the connection and the high-pressure pump.

[0031] The high-pressure cleaning device 1 has an operating element 7. The operating element 7 is designed separately from the main switch 19. The main line valve 8 can be switched between the open state 20 and the closed state 40 by means of the operating element 7. In the exemplary embodiment, the operating element 7 is arranged on the ejection unit 11.

[0032] The high-pressure cleaning device 1 has a bypass line 12. The bypass line 12 fluidically connects the pressure chamber 10 to the suction chamber 9. The bypass line 12 enables a further fluidic connection between the suction chamber 9 and the pressure chamber 10, separate from the fluidic connection between the suction chamber 9 and the pressure chamber 10, via the high-pressure pump 3.

[0033] When the high-pressure pump 3 is in operation, the pressure in the pressure chamber 10 is higher than in the suction chamber 9. Due to this pressure gradient, fluid can flow from the pressure chamber 10 into the suction chamber 9 through the bypass line 12. A bypass valve 13 is arranged in the bypass line 12. The free cross-sectional area of ​​the bypass line 12 can be adjusted using the bypass valve 13. This allows the pressure in the pressure chamber 10 to be regulated. With a larger free cross-sectional area, the pressure equalization between the pressure chamber 10 and the suction chamber 9 occurs to a greater extent. If a high pressure is to prevail in the pressure chamber 10, the free cross-sectional area of ​​the bypass line 12 is reduced using the bypass valve 13. The larger the free cross-sectional area of ​​the bypass line 13, the greater the volume flow through the bypass line 13 during operation, all other conditions remaining unchanged.

[0034] The bypass valve 13 can be adjusted in stages or continuously between a fully closed state and a fully open state. Between the fully closed state and the fully open state, the bypass valve 13 can have different degrees of closure. In the exemplary embodiment, the bypass valve 13 is continuously adjustable, at least in sections. It can also be provided that the bypass valve is continuously adjustable between the fully closed state and the fully open state without interruption.

[0035] Depending on the degree of closure of the bypass valve 13, the size of the volume flow of the liquid in the main line 5 can be adjusted. The more the bypass valve 13 is closed, the smaller the free cross-sectional area of ​​the bypass line 12. The more the bypass valve 13 is closed, the greater the volume flow of the liquid in the main line 5. The more the bypass valve 13 is closed, the greater the volume flow of the liquid in the main line 5 present at the ejection opening 6.

[0036] The bypass valve 13 is adjustable using the control element 7. This serves to adjust the free cross-sectional area of ​​the bypass line 12. By adjusting the bypass valve 13, the pressure in the main line 5, in particular in the pressure chamber 10, can be regulated, particularly at the discharge opening 6. Using the control element 7, the main line valve 8 can be switched between the open state 20 and the closed state 40, and the bypass valve 13 can be adjusted.

[0037] The ejection unit 11 is movable relative to the pump unit 18. In the exemplary embodiment, the main line 5 between the pump unit 18 and the ejection unit 11 is designed as a flexible hose. The ejection opening 6 is arranged on the ejection unit 11. The ejection unit 11 can be directed with its ejection opening 6 toward an object to be cleaned. The ejection unit 11 is hand-guided. The operating element 7 is arranged on the ejection unit 11. A user can guide the ejection unit 11 with one hand and simultaneously operate the operating element 7 with the same hand.

[0038] The hand-held ejection unit 11 has a handle area 14. The operating element 7 is arranged in the handle area 14. The high-pressure cleaning device 1 is designed such that a user can hold the hand-held ejection unit 11 by grasping the handle area 14 with one hand and simultaneously operate the operating element 7 with a finger of the same hand. In the exemplary embodiment, the finger is the index finger. Operating the operating element 7 with the thumb is not provided in the exemplary embodiment.

[0039] The control element 7 has an unactuated state 30. The unactuated state 30 is in Fig. 1 The operating element 7 has an actuated state 50. The actuated state 50 is shown in Fig. 2 shown. The operating element 7 is preloaded into the unactuated state 30. A spring not shown in the figures can be used for this purpose. The operating element 7 is adjustable within an adjustment range 31. Within the adjustment range 31, the operating element 7 can assume various adjustment positions. It is provided that the actuated state of the operating element 7 comprises several different adjustment positions. It can be provided that the operating element 7 is only adjustable in steps. In the exemplary embodiment, the operating element can be continuously adjusted into adjustment positions within the adjustment range 31.

[0040] The high-pressure cleaning device 1 comprises a detector 15. The detector 15 is designed to detect an adjustment position of the operating element 7. The detector 15 can detect any continuous adjustment position of the operating element 7 within the adjustment range 31. The detector 15 can be a Hall sensor. In the exemplary embodiment, the detector 15 is a potentiometer. The operating element 7 and the detector 15 are arranged on the ejection unit 11 in such a way that the detection of the adjustment position of the operating element 7 is possible. The operating element 7 interacts with the detector 15.

[0041] The high-pressure cleaning device 1 is designed such that the bypass valve 13 adjusts the size of the free cross-sectional area of ​​the bypass line 12 depending on the adjustment position of the control element 7. For this purpose, the detector 15 detects the adjustment position of the control element 7 and generates a signal, based on which the bypass valve 13 is adjusted. In the exemplary embodiment, part of this signal is an initial signal 24. The initial signal 24 is generated by the detector 15 and forwarded to a transmitting unit 21. In the exemplary embodiment, the signal 24 is an electrical signal. The initial signal 24 is forwarded to the transmitting unit 21 via a signal line, in the exemplary embodiment via a power cable. It can also be provided that an electrical or electromagnetic signal is used directly to adjust the bypass valve 13. In the exemplary embodiment, the transmitting unit 21 is arranged on the ejection unit 11.The bypass valve 13 is adjustable using the signal triggered by the control element 7. In the exemplary embodiment, the signal is transmitted wirelessly. Based on the initial signal 24 transmitted from the detector 15 to the transmitter unit 21, an electromagnetic signal 25 is generated in the transmitter unit 21. The electromagnetic signal 25 is part of the signal emitted by the control element 7 for adjusting the free cross-sectional area of ​​the bypass line 12.

[0042] The high-pressure cleaning device 1 has a control unit 22. The control unit 22 is arranged in the pump unit 18. The electromagnetic signal 25 is transmitted from the transmitter unit 21 to the control unit 22. The electromagnetic signal 24 received by the control unit 22 is used to adjust the free cross-sectional area of ​​the bypass line 12 by means of the bypass valve 13.

[0043] The bypass valve 13 is adjustable by means of a servomotor 16. The servomotor 16 is arranged in the pump unit 18. The servomotor 16 can be adjusted by means of the servomotor 16 such that the free cross-sectional area of ​​the bypass line 12 can be adjusted. Based on the electromagnetic signal 25 received by the transmitter unit 21 in the control unit 22, an end signal 26 is generated in the control unit 22, which is transmitted to the servomotor 16. In the exemplary embodiment, the end signal 26 is transmitted electrically via a cable. However, it can also be provided that the end signal is transmitted wirelessly. The end signal 26 is part of the signal emitted by the control element 7 for adjusting the free cross-sectional area of ​​the bypass line 12. Based on the end signal 26, the servomotor 16 adjusts the bypass valve 13.By means of the servomotor 16, the bypass valve 13 can be adjusted so that a continuous adjustment of the size of the free cross-sectional area of ​​the bypass line 12 is possible. The size of the free cross-sectional area can be continuously adjusted using the control element 7.

[0044] The operating element 7 is arranged on the ejection unit 11. The operating element 7 is arranged in particular on the gun. The operating element 7 is arranged in the handle area 14. The opening of the main line valve 8 by the operating element 7 can be effected mechanically. In the exemplary embodiment, however, this is also effected by a main line signal 27 sent from the detector 15 to the main line valve 13. In the exemplary embodiment, this main line signal 27 is an electrical signal. As soon as the operating element 7 is in the actuated state 50 – i.e. no longer in the deactuated state 30 – this is detected by the detector 15. The detector 15 generates the main line signal 27, which is transmitted to the main line valve 8. This main line signal 27 causes the main line valve 8 to be transferred from the closed state 20 to the open state 40.As long as the control element 7 is in the actuated state 50, the main line signal 27 which continues to be transmitted from the detector 15 to the main line valve 8 ensures that the main line valve 8 is in the open state 40.

[0045] The high-pressure cleaning device 1 is designed such that, in the unactuated state 30 of the control element 7, the bypass valve 13 is adjusted such that the free cross-sectional area of ​​the bypass line 12 is maximized. The high-pressure cleaning device 1 is structurally designed such that, before a reduction in the maximum free cross-sectional area of ​​the bypass line 13 triggered by the control element 7, the main line valve 8 is switched from the closed state 20 to the open state 40 by means of the control element 7. The bypass valve 13 is opened only after the main line valve 8 has been opened.

[0046] The high-pressure cleaning device 1 is designed such that, before the control element 7 is transferred from the actuated state 50 of the control element 7 to the unactuated state 30 of the control element 7, the bypass valve 13 is adjusted such that the free cross-sectional area of ​​the bypass line 12 is increased. Before the main line valve 8 is transferred from the open state 40 to the closed state 20, the bypass valve 13 is at least partially opened.

[0047] As in Fig. 2As shown, the operating element 7 can be adjusted along an adjustment path 32 from a rest position 28 into adjustment positions with increasing distance from the rest position 28. The operating element 7 assumes the maximum distance from the rest position 28 in an end position 38. The high-pressure cleaning device 1 is designed such that the bypass valve 13 reduces and / or at least does not increase the free cross-sectional area of ​​the bypass line 12 as the distance of the operating element 7 from the rest position 28 increases. As the distance of the operating element 7 from the rest position 28 increases, the pressure in the main line 5, in particular in the pressure chamber 10, increases. A smaller volume of the liquid pumped by the high-pressure pump 3 can flow back from the pressure chamber 10 into the suction chamber 9 via the bypass line 12. In the end position 38, the pressure in the main line 5, in particular in the pressure chamber 10, is maximum for the open state 40 of the main line valve 8.

[0048] The distance to the rest position 28 refers to the distance of a reference point on the operating element 7. In the exemplary embodiment, the operating element 7 is a lever that can be pivoted about a pivot axis 23. In the exemplary embodiment, the reference point is the point on the operating element 7 with the greatest distance from the pivot axis 23. The rest position 28 is defined in the exemplary embodiment by the position of the reference point when the operating element 7 is not actuated.

[0049] When the operating element 7, designed as a lever, is actuated in the rest position 28 of the operating element 7, the operating element 7—and thus also the reference point—is pivoted along the travel path 32. In this case, the travel path 32 is a circular segment. The distance of the operating element 7 to the rest position 28 corresponds to the distance of the reference point to the rest position 28 measured along the travel path 32 designed as a circular segment. It can also be provided to measure the distance in the form of an angular distance of the reference point to the rest position relative to a pivoting movement about the pivot axis 23.

[0050] The high-pressure cleaning device 1 is designed such that the control element 7 allows continuous adjustment of the pressure in the pressure chamber 10 while liquid is being sprayed out of the spray opening 6.

[0051] In the illustrated embodiment, the control element 7 is a single component that combines the functions of both operating the main line valve 8 and operating the bypass valve 13. The control element 7 is a single piece. The control element 7 can be operated with a single finger.

[0052] The high-pressure cleaning device 1 is designed such that an actuation of the operating element 7 by a user during use of the high-pressure cleaning device 1 is possible both for switching the main line valve 8 between the open state 20 and the closed state 10 and for adjusting the bypass valve 13 using only a single finger, namely the index finger, the middle finger, the ring finger or the little finger.

[0053] The high-pressure cleaning device 1 is designed such that the actuation of the main line valve 8 for switching the main line valve 8 between the open state 20 and the closed state 10, and the actuation of the bypass valve 13 for adjusting the bypass valve 13, can be triggered by actuating the control element 7 using a single continuous movement of a single finger. In particular, during the single continuous movement, the main line valve 8 and then the bypass valve 13 are actuated one after the other. Depending on the operating state, the continuous movement occurs in the opposite direction. Accordingly, during the single continuous movement, the bypass valve 13 and then the main line valve 8 are actuated one after the other.

[0054] When the control element 7 travels the travel path 32 starting from the rest position 28, the detector 15 initially detects a movement of the control element 7 from the rest position 28 upon actuation of the control element 7. The detector 15 then sends the main line signal 27 to the main line valve 8, which is then transferred from the closed state 20 to the open state 40. Only upon further movement of the control element 7 along the travel path 32, i.e. upon further movement of the control element 7, designed as a lever, from the rest position 28, does the detector 15 send an initial signal 24 to the transmitting unit 21, due to which the maximum free cross-sectional area of ​​the bypass line 12 is reduced by the bypass valve 13 and the actuator 16.

[0055] The transition of the control element 7 from the actuated state 50 to the unactuated state 30 occurs in the reverse order. When the control element 7, designed as a lever, approaches the rest position 28, the free cross-sectional area of ​​the bypass line 12 is first adjusted by adjusting the bypass valve 13 using the servomotor 16. Only when the free cross-sectional area of ​​the bypass line 12 is at its maximum is the main line valve 8 transferred from the open state 40 to the closed state 20 due to a missing main line signal 27 from the detector 15, which detects a corresponding adjustment position of the control element 7, designed as a lever. It can also be provided that a different signal is provided for this purpose instead of the missing main line signal 27.

Claims

1. High-pressure cleaning device comprising: - a connector (2) for a liquid source (14), - a high-pressure pump (3), - a main line (5), through which liquid can be delivered from the connector (2) to a discharge opening (6) of the main line (5) by means of the high-pressure pump (3), - a main line valve (8) which is arranged in the main line (5), - a hand-held discharge unit (11), on which the discharge opening (6) is arranged, and - an operating element (7) arranged on the hand-held discharge unit (11), wherein, in a closed state (20), the main line valve (8) prevents a throughflow of liquid through the main line (5), and wherein, in an open state (40), the main line valve (8) allows a throughflow of liquid through the main line (5), wherein the main line valve (8) can be switched between the open state (20) and the closed state (40) by means of the operating element (7), wherein the main line (5) has a suction chamber (9) between the connector (2) and the high-pressure pump (3), wherein the main line (5) has a pressure chamber (10) between the high-pressure pump (3) and the discharge opening (6), wherein the pressure chamber (10) is fluidically connected to the suction chamber (9) via a bypass line (12), wherein a bypass valve (13) is arranged in the bypass line (12), wherein a free cross-sectional area of the bypass line (12) is adjustable by means of the bypass valve (13) for regulating the pressure in the pressure chamber (10), characterized in that the bypass valve (13) is adjustable by means of the operating element (7) for adjusting the free cross-sectional area of the bypass line (12).

2. High-pressure cleaning device according to Claim 1, characterized in that the hand-held discharge unit (11) has a grip region (14), in that a user can hold the hand-held discharge unit (11) by gripping around the grip region (14), and in that the operating element (7) can be actuated by a finger of the user when gripping around the grip region (14).

3. High-pressure cleaning device according to Claim 1 or 2, characterized in that the high-pressure cleaning device (1) comprises a detector (15), and in that the detector (15) is designed for detecting an adjustment position of the operating element (7).

4. High-pressure cleaning device according to Claim 3, characterized in that the detector (15) is a potentiometer or a Hall sensor.

5. High-pressure cleaning device according to Claim 3 or 4, characterized in that the high-pressure cleaning device (1) is designed such that the bypass valve (13) sets the size of the free cross-sectional area depending on the adjustment position of the operating element (7), and in particular in that the size of the free cross-sectional area is continuously adjustable by means of the operating element (7).

6. High-pressure cleaning device according to one of Claims 1 to 5, characterized in that the bypass valve (13) is adjustable by means of an actuating motor (16).

7. High-pressure cleaning device according to one of Claims 1 to 6, characterized in that the bypass valve (13) is adjustable by means of a signal triggered by the operating element (7), and in that the signal can preferably be transmitted wirelessly.

8. High-pressure cleaning device according to one of Claims 1 to 7, characterized in that the high-pressure cleaning device (1) comprises a motor (4) for driving the high-pressure pump (3), and in particular in that the motor (4) is an induction motor or a brushless DC motor.

9. High-pressure cleaning device according to one of Claims 1 to 8, characterized in that the high-pressure cleaning device (1) is designed such that the bypass valve (13) is adjusted in an unactuated state (30) of the operating element (7) such that the free cross-sectional area of the bypass line (12) is at a maximum.

10. High-pressure cleaning device according to Claim 9, characterized in that the high-pressure cleaning device (1) is designed such that, before a reduction of the maximum free cross-sectional area of the bypass line (13) triggered by the operating element (7), the main line valve (8) is switched from the closed state (20) into the open state (40) by means of the operating element (7).

11. High-pressure cleaning device according to Claim 9 or 10, characterized in that the high-pressure cleaning device (1) is designed such that, before a transfer of the main line valve (8) from the open state (40) into the closed state (20) by means of the operating element (7), the free cross-sectional area of the bypass line (12) is enlarged by means of the operating element (7).

12. High-pressure cleaning device according to one of Claims 1 to 11, characterized in that the operating element (7) is adjustable from the unactuated state (30) from an unactuated rest position (28) along an adjustment path into adjusting positions at an increasing distance from the rest position (28), and in that the high-pressure cleaning device (1) is designed in such a way that the bypass valve (13) reduces the free cross-sectional area of the bypass line (12) as the distance of the control element (7) from the rest position (28) increases.

13. High-pressure cleaning device according to one of Claims 1 to 12, characterized in that the high-pressure cleaning device (1) is designed such that a continuous adjustment of the pressure in the pressure chamber (10) is possible by means of the operating element (7) during the discharge of liquid from the discharge opening (6).

14. High-pressure cleaning device according to one of Claims 1 to 13, characterized in that the operating element (7) is a single component in which the functions of both the actuation of the main line valve (8) and the actuation of the bypass valve (13) are combined.