High-pressure cleaning device and method for operating a high-pressure cleaning device

Abstract

The invention relates to a high-pressure cleaning device comprising a high-pressure pump (3), a main line (5), a main line valve (8) arranged in the main line (5), a motor (4) for driving the high-pressure pump (3), a shut-off device (40) with which the motor (4) can be switched off, and an operating element (42). The main line (5) has a suction chamber (9) upstream of the high-pressure pump (3) and a pressure chamber (10) downstream of the high-pressure pump (3). A bypass device (30) for fluidic connection between the pressure chamber (10) and the suction chamber (9) is arranged between the pressure chamber (10) and the suction chamber (9), and includes a bypass valve (13). To regulate the pressure in the pressure chamber (10) by means of the bypass valve (13), the size of the free cross-sectional area of ​​the bypass device (30) can be adjusted by means of the operating element (42).The shut-off device (40) causes the motor (4) to be in the off state due to the pressure present in the pressure chamber (10) when the pressure in the pressure chamber (10) corresponds to at least a pressure threshold value. The bypass valve (13) adjusts the size of the free cross-sectional area, independently of any actuation of the control element (42), to a minimum such that the pressure in the pressure chamber (10) corresponds to at least the pressure threshold value when the main line valve (8) is in the closed state and the motor (4) is simultaneously in the on state.

Description

[0001] The invention relates to a high-pressure cleaning device according to the preamble of claim 1 and a method for operating a high-pressure cleaning device according to the preamble of claim 10.

[0002] From DE 10 2023 101 418 A1, a high-pressure cleaning device is known in which a bypass device is provided between the pressure chamber and the suction chamber for fluidic connection between the two. To regulate the pressure in the pressure chamber, the free cross-sectional area of ​​the bypass device is adjustable by means of a bypass valve depending on the degree of actuation of a control element. A high-pressure pump conveys liquid through a main line. The high-pressure pump is driven by a motor. Furthermore, the high-pressure cleaning device includes a shut-off device with which the motor can be switched off. If the spraying out of the pressure chamber is stopped because the operator no longer presses the corresponding control lever and the corresponding main line is closed, the pressure in the pressure chamber increases. This pressure acts on the shut-off device.Due to the pressure present in the pressure chamber, the shut-off device ensures that the motor is in the off state when the pressure in the pressure chamber reaches at least a certain pressure threshold. This prevents the motor from continuing to run continuously with the main line valve closed, thus preventing the pressure in the pressure chamber from building up continuously. With a sufficiently large free cross-sectional area of ​​the bypass device, it is theoretically possible that the pressure in the pressure chamber would not rise above the pressure threshold after the main line is closed by the main line valve. Consequently, the shut-off device would not switch the motor off. The drive motor would then remain running and pump fluid in a closed loop through the bypass device. This would consume energy and cause unnecessary wear on the high-pressure cleaner. To prevent this, the bypass device of DE 10 2023 101 418 A1 includes a pressure build-up valve.If the flow rate through the bypass device, particularly through the bypass line, exceeds a certain volume threshold, the free cross-sectional area of ​​the bypass device is reduced by the pressure build-up valve to at least the extent necessary to ensure that the pressure in the pressure chamber is at least equal to the pressure threshold. This ensures that the motor driving the high-pressure pump is switched off when the main line is closed by the shut-off device. However, the pressure build-up valve adds cost and requires installation space.

[0003] The invention is based on the objective of further developing a generic high-pressure cleaning device in such a way that pressure regulation of the pressure in the pressure chamber is possible by adjusting the free cross-sectional area of ​​the bypass device, and that at the same time, low-wear and energy-saving operation of the high-pressure cleaning device is possible in a cost-effective and space-saving manner.

[0004] This problem is solved by a high-pressure cleaning device with the features of claim 1.

[0005] A further object of the invention is to provide a method by which pressure regulation of the pressure in the pressure chamber is possible by adjusting the free cross-sectional area of ​​the bypass device and in which, at the same time, cost-effective and space-saving operation of the high-pressure cleaning device is possible with low wear and energy saving.

[0006] This problem is solved by a method having the features of claim 10.

[0007] The high-pressure cleaning device according to the invention is designed such that the bypass valve, in particular an actuator for the bypass valve, and in particular a control unit for controlling the bypass valve, adjusts the size of the free cross-sectional area, independently of any actuation of the control element, and in particular of the degree of actuation of the control element, to at least such a small extent, and in particular to such an extent, that the pressure in the pressure chamber corresponds at least to the pressure threshold when the main line valve is in the closed state and the motor is simultaneously in the on state. This ensures that the shut-off device, due to the pressure then present in the pressure chamber above the pressure threshold, causes the motor to be switched off. In contrast to the prior art, no extra component such as a pressure cut-off valve is required for this purpose. The existing bypass valve can be used for this.The invention is based on the realization that the bypass valve can be used as a pressure build-up valve. Because no separate pressure build-up valve is required, costs and installation space can be saved. Overall, the high-pressure cleaner is easy to construct. Even without a pressure build-up valve, the existing bypass valve can be used effectively to prevent unnecessary recirculation of the fluid. This minimizes wear on the components of the high-pressure cleaner. The service life of the high-pressure cleaner is thus extended in a simple, cost-effective, and space-saving manner.

[0008] In particular, the fluid flows in a flow direction from the pressure chamber through the bypass device, especially the bypass line and the bypass valve, towards the suction chamber. The free cross-sectional area is oriented perpendicular to the flow direction. Specifically, the free cross-sectional area is the smallest area of ​​the bypass device through which the fluid flows, oriented perpendicular to the flow direction. The free cross-sectional area determines the maximum volumetric flow rate, and in particular the maximum flow rate, of fluid through the bypass device.

[0009] In a further development of the invention, it is provided that the flow of liquid through the bypass device by means of the bypass valve is prevented when the main line valve is in the closed state and the motor is simultaneously in the off state. In other words, the size of the free cross-sectional area is zero. This allows the pressure in the pressure chamber to build up in the same way as if no bypass device were present when the main line valve is in the closed state and the motor is simultaneously in the on state.

[0010] In a further embodiment of the invention, it is provided that the bypass valve, in particular the actuator, and in particular the control unit, adjusts the size of the free cross-sectional area, independently of any actuation of the control element, and in particular of the degree of actuation of the control element, to a minimum, and in particular to a minimum, such that the pressure in the pressure chamber corresponds to at least the pressure threshold value when the main line valve is in the transition from the fully open state to the closed state and the motor is simultaneously in the on state. In other words, the bypass valve, in particular the actuator, and in particular the control unit, adjusts the size of the free cross-sectional area, independent of the actuation, and in particular the degree of actuation, of the control element already during the switching phase of the main line valve, such that the pressure in the pressure chamber corresponds to at least the pressure threshold value.In particular, the high-pressure cleaner is designed so that, at maximum motor and pump output and with the bypass valve fully closed, the pressure in the pressure chamber will only exceed the pressure threshold if the main line valve is not fully open. This allows the shutdown device to switch the motor off very early, minimizing wear on the components of the high-pressure cleaner and reliably preventing excessive pressure buildup in the pressure chamber.In particular, it is provided that the bypass valve adjusts the size of the free cross-sectional area, regardless of the actuation of the control element, in particular the degree of actuation of the control element, to at least such a small size, in particular to such an extent, that the pressure in the pressure chamber corresponds at least to the pressure threshold value when the main line valve is not in the fully open state and at the same time the motor is in the on state.

[0011] In particular, the shut-off device is fluidically connected to the pressure chamber. This allows the pressure of the pressure chamber, especially the pressure of the liquid in the pressure chamber, to act on the shut-off device.

[0012] In particular, the size of the free cross-sectional area depends solely on the actuation of the control element, especially the degree of actuation, when the main line valve is in the fully open position. This applies at least during normal operation of the high-pressure cleaner, especially after the motor has finished starting up to drive the high-pressure pump. This allows the pressure in the main line's pressure chamber to be easily adjusted by actuating the control element.

[0013] In particular, the high-pressure cleaner is designed so that the size of the free cross-sectional area, especially during normal operation, does not increase with increasing actuation of the control element, and in particular decreases when the main line valve is fully open. This allows for intuitive operation of the high-pressure cleaner. To clean areas requiring higher water pressure, the operator can conveniently increase the pressure briefly by applying more force to the control element (high actuation) and then reduce it again at another location where lower pressure is needed by applying less force to the control element (low actuation).In principle, the harder the control element is pressed, especially the greater the degree of actuation, the greater the pressure in the pressure chamber, and therefore also the pressure of the ejected liquid.

[0014] In particular, the bypass valve is adjustable by means of the actuator. This allows the free cross-sectional area of ​​the bypass device, especially the bypass valve, to be conveniently adjusted. Specifically, the free cross-sectional area of ​​the bypass device can be set to a minimum, and in particular reduced to such an extent, that the pressure in the pressure chamber corresponds at least to the pressure threshold when the main valve is closed and the actuator is simultaneously switched on.

[0015] The high-pressure cleaning device includes, in particular, the control unit. Specifically, the high-pressure cleaning device is designed such that the control unit contains information about whether the main line valve is in the closed or fully open state. Specifically, the control unit can also contain information about whether the main line valve is in an intermediate state between the closed and fully open states. Specifically, the high-pressure cleaning device is designed such that the control unit contains information about whether the motor is in the on or off state. Specifically, the control unit can transmit a signal to the actuator for the bypass valve. Depending on the shape and / or intensity of the signal, the actuator adjusts the size of the free cross-sectional area of ​​the bypass device.If the control unit has information that both the main line valve is in the closed state and the motor is in the on state, the control unit sends a corresponding signal to the actuator, regardless of whether the control element is actuated, in particular regardless of the degree of actuation of the control element, whereby the actuator adjusts the bypass valve so that the size of the free cross-sectional area of ​​the bypass device is large enough that the pressure in the pressure chamber corresponds at least to the pressure threshold value.

[0016] In particular, the main line valve can be actuated by means of a valve control element. Specifically, the main line valve can be switched between the fully open and closed states by means of the valve control element. Specifically, the high-pressure cleaning device is designed such that the control unit receives information about whether the valve control element has been actuated to such an extent that the main line valve is in the fully open or closed state. This information can also simply state the main line valve. Based on this information, the control unit can decide whether the size of the free cross-sectional area is adjusted independently of the actuation of the control element, and in particular, the degree of actuation of the control element.

[0017] In particular, the main line valve, when closed, prevents the flow of liquid through the main line. Conversely, when fully open, the main line valve allows the unimpeded flow of liquid through the main line.

[0018] In particular, the motor for driving the high-pressure pump has a switch for switching the motor between the on and off states. The shut-off device has an actuating element. The high-pressure cleaning device is designed such that the fluid in the pressure chamber acts on the actuating element, which then actuates the motor's switch, causing the motor to be in the off state when the pressure in the pressure chamber is at least equal to the pressure threshold. The switch allows the motor to be easily switched to the off state when the pressure threshold in the pressure chamber is exceeded.

[0019] In particular, the high-pressure cleaner has a pressure relief line. The pressure relief line connects the pressure chamber to the suction chamber fluidically, in addition to the connection via the bypass device and the high-pressure pump. Specifically, a pressure relief valve is arranged in the pressure relief line. The pressure relief valve is designed to open when the pressure in the pressure chamber is at least equal to the pressure threshold. This allows pressure equalization between the pressure chamber and the suction chamber. This is possible even when the motor has already been switched off. The pressure equalization between the pressure chamber and the suction chamber protects the components of the high-pressure cleaner. This extends the service life of the high-pressure cleaner and enables low-wear operation. The pressure relief valve has one valve element.In particular, the valve element and the actuating element are movable together. This allows for savings in components and installation space. Because the high-pressure cleaner is designed so that when the valve element moves due to the pressure acting on it in the pressure chamber, the actuating element is also moved, a simple design of the high-pressure cleaner is possible.

[0020] In particular, the high-pressure cleaning device is designed so that the shut-off device is subjected to only a single pressure value from the pressure chamber. This allows for a simple design of the high-pressure cleaning device. Specifically, a complex design based on pressurizing the shut-off device on one side with an injector pressure and on the other side with the pressure value in the pressure chamber upstream of the Venturi can be avoided.

[0021] The high-pressure cleaning device includes a check valve. Specifically, the check valve is located in the pressure chamber downstream of the bypass device, particularly the bypass line, and upstream of the shut-off device. This ensures that the pressure on the shut-off device can only increase as long as the motor driving the high-pressure pump is running and the main line valve is closed. This also ensures that the pressure on the pressure relief valve can only increase as long as the motor driving the high-pressure pump is running and the main line valve is closed. This fulfills a condition for the pressure in the pressure chamber to exceed the pressure threshold and for the shut-off device to switch the motor off. It also ensures that the pressure in the pressure chamber exceeds the pressure threshold and opens the pressure relief valve.

[0022] According to the inventive method, the size of the free cross-sectional area is set, independently of any actuation, in particular the degree of actuation, of the control element by means of the bypass valve, to at least such a small size, in particular to such a extent, that the pressure in the pressure chamber corresponds at least to the pressure threshold value when the main line valve is in the closed state and the motor is simultaneously in the running state. This is associated with the advantages described for the high-pressure cleaning device.

[0023] The method for operating a high-pressure cleaning device can be further developed analogously to include the optional features described above for the high-pressure cleaning device. Such further development of the method is associated with the advantages described above for the various features.

[0024] Exemplary embodiments of the invention are explained below with reference to the drawing. The drawing shows: Fig. 1. A perspective view of a pump unit of a high-pressure cleaning device, Fig. 2 and Fig. 3 perspective views of a handheld spray unit of the high-pressure cleaning device, Fig. 4. A side view of the handheld spray unit according to the Fig. 2 and Fig. 3, Fig. 5 A schematic representation of a high-pressure cleaning device with a bypass device having a bypass valve for regulating the pressure in the pressure chamber of the main line of the high-pressure cleaning device by means of a pressure control element, wherein both the pressure control element and a valve control element are Fig. 5 are unactivated, Fig. 6 a schematic representation of the high-pressure cleaning device Fig. 5 with actuated valve control element and unactuated pressure control element, Fig. 7 a schematic representation of the high-pressure cleaning device Fig. 5 with actuated valve control element and with actuated pressure control element and Fig. 8 a hydraulic circuit diagram of the high-pressure cleaning device Fig. 5.

[0025] Fig. Figure 1 shows a pump unit 18 of a system in Fig. 5 schematically represented high-pressure cleaning devices 1.

[0026] The high-pressure cleaning device 1 includes a spray unit 11. The spray unit 11 can be, as shown in the Fig. 5, Fig. 6 to Fig. 7, is designed as a pistol. A dispensing opening 6 is arranged on the pistol. Alternatively, the dispensing unit 11 can also be, as shown in the Fig. 2, Fig. 3 to Fig. Figure 4 shows that it is designed as a pistol with lance 28. In this case, the dispensing opening 6 is located on the lance 28.

[0027] The high-pressure cleaning device 1, in particular the spray unit 11, is designed for cleaning objects with pressurized cleaning fluid. In the exemplary embodiments, the high-pressure cleaning device 1 is portable. The high-pressure cleaning device 1, in particular the pump unit 18, has a Fig. The high-pressure cleaning device 1, in particular the pump unit 18 of the high-pressure cleaning device 1, is attached to the handle 23. In normal operation, the high-pressure cleaning device 1, in particular the pump unit 18, is placed on a support surface.

[0028] As in the Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the high-pressure cleaning device 1 has a high-pressure pump 3. The high-pressure pump 3 is part of the pump unit 18. The high-pressure pump 3 is used to pressurize liquid in the high-pressure cleaning device 1, particularly in the pump unit 18. The liquid is, in particular, water, or more specifically, a mixture of water and an additive. The additive is, in particular, a cleaning agent solution, especially a soap solution. The cleaning agent is, in particular, liquid. The high-pressure pump 3 can pressurize the liquid to a pressure of at least 10 bar, in particular at least 15 bar, in particular at least 30 bar, and in particular at least 100 bar. In particular, the high-pressure pump 3 can pressurize the liquid to a maximum pressure of 600 bar, in particular at most 500 bar. The high-pressure pump 3 comprises at least one piston (not shown).At least one piston can be moved back and forth to generate pressure on the liquid. A high-pressure pump typically comprises three pistons.

[0029] As in the Fig. As shown in Figures 1 and 5 to 7, the high-pressure cleaning device 1, in particular the pump unit 18, comprises a connection 2 for a liquid source 17. In the exemplary embodiments, the liquid source 17 is an external liquid source. In these embodiments, the external liquid source is the tap of a domestic water supply. It can also be provided that the liquid source is an integral part of the high-pressure cleaning device 1. The high-pressure cleaning device 1, in particular the handheld spray unit 11, comprises a spray opening 6.

[0030] As in the Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the pump unit 18 and the spray unit 11 are fluidically connected to each other via a main line 5. The high-pressure cleaning device 1 includes the main line 5. The main line 5 fluidically connects the port 2 to the spray opening 6. The port 2 is located on the pump unit 18. The spray opening 6 is located on the spray unit 11. In the exemplary embodiment according to the Fig. 2, Fig. 3 to Fig. 4 The dispensing opening 6 is arranged on a lance 28 of the dispensing unit 11. In the exemplary embodiment according to the Fig. 5, Fig. 6 to Fig. The dispensing opening 6 is located on the dispensing unit 11, which is designed as a pistol.

[0031] By means of the high-pressure pump 3, liquid can be pumped through the main line 5 from the connection 2 to the spray opening 6. The liquid source 17 supplies liquid to the main line 5. The high-pressure pump 3 is located in the main line 5. The high-pressure pump 3 pressurizes the liquid. The high-pressure pump 3 is located between a suction chamber 9 and a pressure chamber 10 of the main line 5. This is shown in the Fig. 5, Fig. 6, Fig. 7 to Fig. Figure 8 illustrates this. The main line 5 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 spray opening 6. In the exemplary embodiments, 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 embodiments, the pressure chamber 10 is formed by a section of the main line 5 between the high-pressure pump 3 and the spray opening 6. This section of the main line 5 extends, in particular, precisely from the high-pressure pump 3 to precisely the spray opening 6. The high-pressure pump 3 pumps liquid from the suction chamber 9 to the pressure chamber 10. When the high-pressure pump 3 is operating, 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 components of the main line 5.Downstream of high-pressure pump 3, the pressure in the main line 5 is higher than upstream of high-pressure pump 3.

[0032] The high-pressure pump 3 is arranged in the pump unit 18. The high-pressure pump 3 is separate from the spray unit 11. Various spray units 11 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 a brushless DC motor. A brushless DC motor is also called an EC motor. The motor can also be a universal motor. In the exemplary embodiments, 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 embodiments is operated with alternating current. The voltage source can be provided, for example, by the mains voltage.If battery or rechargeable battery operation is provided, the motor can also be a brushless DC motor. In this case, the battery can be integrated into the high-pressure cleaner 1. Specifically, the pump unit can be integrated into the handheld spray unit 11. In this case, the entire high-pressure cleaner 1 is portable and handheld during operation. Specifically, the pump unit and the spray unit are then integrally designed. Specifically, the pump unit and the spray unit are then arranged in a common housing. Specifically, the pump unit and the spray unit are then rigidly connected, specifically not via a flexible hose. Specifically, the main line 5 is then arranged in a single housing.

[0033] As in the Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the high-pressure cleaning device 1 includes a main switch 19. The main switch 19 serves to interrupt the power supply to the entire high-pressure cleaning device 1. The main switch 19 is located on the pump unit 18.

[0034] The high-pressure cleaning device 1 comprises a main line valve 8. The main line valve 8 is arranged in the main line 5. In the exemplary embodiments, the main line valve 8 is arranged in the spray unit 11. The main line valve 8 has a closed state and a fully open state. In the fully open state, the main line valve 8 allows the flow of liquid through the main line 5, in particular without obstruction. The fully open state of the main line valve 8 is shown in the Fig. 6 and Fig. Figure 7 illustrates this. In the fully open state, the flow cross-section of the main line 5 at the position of the main line valve 8 is at its maximum. Further opening of the main line valve 8 does not result in a larger flow cross-section for the liquid in the main line 5 at the position of the main line valve 8 when fully open. When the main line valve 8 is closed, it prevents the flow of liquid through the main line 5, in particular completely. When the main line valve 8 is fully open, liquid is sprayed out of the spray opening 6 during operation, especially during normal operation, of the high-pressure cleaning device 1. When the main line valve 8 is closed, no liquid is sprayed out of the spray opening 6. In the exemplary embodiments, the main line valve 8 is arranged between the high-pressure pump 3 and the spray opening 6.

[0035] The high-pressure cleaning device 1 includes the components listed in the Fig. 5, Fig. 6 to Fig. 7 Bypass device 30 shown. By means of the bypass device 30 the pressure in the main line 5, in particular in the pressure chamber 10, can be influenced, in particular changed, in particular adjusted.

[0036] The high-pressure cleaning device 1, in particular the spray unit 11, has an operating device 7. The operating device 7 is separate from the main switch 19. The bypass device 30 can be operated by means of the operating device 7.

[0037] In particular, the main line valve 8 can be switched between the fully open and closed states by means of the operating device 7. In the exemplary embodiments, the operating device 7 is arranged on the injection unit 11.

[0038] The operating device 7 generates a control signal that depends on an actuation, in particular the degree of actuation of the operating device 7. Based on the control signal, the bypass device 30 adjusts the fluid flow rate, in particular the pressure, of the fluid in the main line 5, in particular in the pressure chamber 10.

[0039] In the exemplary embodiments, the operating device 7 comprises a valve control element 41 and a control element 42. The valve control element 41 serves to actuate the main line valve 8, in particular to switch between the closed state and the fully open state. The control element 42 serves to actuate the bypass device 30. Alternatively, the operating device 7 can also consist of a single control element that serves to actuate both the main line valve 8 and the bypass device 30. For example, the single control element can be adjustable along a travel path.When the control element is initially actuated, the main line valve 8 is opened first. After a portion of its travel has traversed, the bypass device 30 is actuated, thereby changing, and in particular adjusting, the fluid flow rate, especially the pressure, in the main line 5, and specifically in the pressure chamber 10. Depending on the degree of actuation, i.e., depending on the extent of the travel, the bypass device 30 then adjusts the fluid flow rate, and in particular the pressure, in the main line 5, and specifically in the pressure chamber 10. Specifically, the single control element generates a control signal that depends on the degree of actuation of the control element. Based on this signal, the bypass device 30 adjusts the fluid flow rate, and in particular the pressure, in the main line 5, and specifically in the pressure chamber 10.

[0040] In the exemplary embodiments, the operating device 7 comprises the control element 42 and the valve control element 41. The control element 42 can be operated independently of the valve control element 41. The high-pressure cleaning device 1, in particular the spray unit 11, is designed such that the valve control element 41 can be actuated without actuating the control element 42. It is possible that the high-pressure cleaning device 1, in particular the spray unit 11, is designed such that the control element 42 can be actuated without simultaneously actuating the valve control element 41. However, such a coupling can also be provided. In particular, it can be provided that the control element 42 can be mechanically pressed without simultaneously pressing the valve control element 41.In the exemplary embodiments, the high-pressure cleaning device 1 is designed such that the control element 42 does not trigger any function when actuated without simultaneously actuating the valve control element 41. In this case, at least no change in the fluid flow rate, in particular the pressure, occurs in the main line 5 triggered by the control element 42, especially not through the bypass device 30. This separation of mechanical actuation and functional release is achieved through control technology.

[0041] The main line valve 8 can be switched between the fully open and closed states by means of the valve control element 41. The fluid flow rate, in particular the pressure, of the fluid in the pressure chamber 10 can be influenced, in particular changed, and in particular preset, by means of the control element 42. This is particularly the case when the main line valve 8 is fully open.

[0042] As in the Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the bypass device 30 comprises a bypass line 12, a bypass valve 13, and in particular an actuator 16. The bypass device 30 serves to connect the pressure chamber 10 and the suction chamber 9 fluidically. The bypass device 30 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.

[0043] The bypass valve 13 is arranged, in particular, between two sections of the bypass line 12. Specifically, the bypass valve 13 is located within the bypass line 12. The bypass valve 13 serves to regulate the pressure in the pressure chamber 10. The size of the free cross-sectional area of ​​the bypass device 30 can be adjusted by means of the bypass valve 13. When the high-pressure pump 3 is in operation, the pressure in the pressure chamber 10 is higher than in the suction chamber 9. When the bypass valve 13 is open, fluid can flow from the pressure chamber 10 to the suction chamber 9 through the bypass device 30, specifically through the bypass line 12 and the bypass valve 13, due to this pressure gradient. The pressure in the pressure chamber 10 can be regulated by adjusting the free cross-sectional area of ​​the bypass device 30 using the bypass valve 13. A larger free cross-sectional area results in greater pressure equalization between the pressure chamber 10 and the suction chamber 9.If a high pressure is required in pressure chamber 10, the free cross-sectional area of ​​the bypass device 30 is reduced by means of the bypass valve 13. The larger the free cross-sectional area of ​​the bypass device 30, in particular of the bypass valve 13, the greater the fluid flow rate through the bypass device 30, in particular through the bypass valve 13, during operation, under otherwise unchanged conditions.

[0044] The bypass valve 13 can be adjusted incrementally or continuously between a fully closed and a fully open state. Between the fully closed and fully open states, the bypass valve 13 can have different degrees of closure. In the exemplary embodiments, the bypass valve 13 is continuously adjustable, at least in sections. It can also be provided that the bypass valve is continuously adjustable without interruption between the fully closed and fully open states. The bypass valve 13 is adjustable by means of the actuator 16. The actuator 16 is arranged in the pump unit 18. By means of the actuator 16, the bypass valve 13 can be adjusted such that the free cross-sectional area of ​​the bypass device 30 is adjustable.

[0045] The operating device 7, in particular the operating element 42, generates the control signal which depends on an actuation, in particular on the degree of actuation of the operating device 7, in particular the operating element 42. In particular, the bypass valve 13 can be actuated depending on, in particular on the intensity and / or shape, of the control signal generated by the operating element 42. In particular, the degree of closure of the bypass valve 13 depends on the control signal, in particular on the intensity and / or shape of the control signal. The bypass device 30 sets the pressure, in particular the fluid flow rate, in the main line 5, in particular in the pressure chamber 10, based on the control signal. The pressure, in particular the fluid flow rate, can be influenced, in particular changed, in particular adjusted by means of the operating element 42 such that the magnitude of the pressure, in particular the fluid flow rate, can assume at least three different values.It may also be provided that the size of the liquid volume flow can be adjusted quasi-continuously, in particular continuously, by means of the control element 42, and in particular can be predetermined.

[0046] The magnitude of the pressure, in particular the fluid volume flow, in the pressure chamber 10 can be influenced, in particular changed, in particular adjusted, depending on the degree of actuation of the control element 42.

[0047] In the unactivated state, the control element 42 is located in a Fig. The control element 42 is adjustable along a travel path 31, in particular into various adjustment positions. The travel path 31 is defined by the rest position 37 and a [missing information - likely a specific position or feature]. Fig. The end position 38 shown in section 7 is limited. The control element 42 is biased into the rest position 37.

[0048] 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 device 30 depending on the adjustment position of the control element 42. Depending on the adjustment position of the control element 42, the control element 42 generates the control signal. Various control signals can be generated by means of the control element 42. Based on the control signal, the bypass device 30 adjusts the pressure, in particular the fluid flow rate, in the main line 5, specifically in the pressure chamber 10.

[0049] In particular, the size of the free cross-sectional area can be adjusted by means of the control element 42 in at least three, in particular at least six, and in particular at least ten steps. It can also be provided that the size of the free cross-sectional area can be adjusted continuously by means of the control element. In the exemplary embodiments, the size of the free cross-sectional area can be adjusted by means of the control element 42 in at most 30, and in particular at most 20, steps. In the exemplary embodiments, the size of the free cross-sectional area can be adjusted quasi-continuously by means of the control element 42. "Quasi-continuous" in this context means that the different pressure levels, in particular the different fluid flow rate levels, are so close together that it appears to the user as if the pressure, in particular the fluid flow rate, is being adjusted continuously when the control element 42 is operated.

[0050] Depending on the degree of closure of the bypass valve 13, the pressure, and in particular the volumetric flow rate of the liquid in the main line 5, especially in the pressure chamber 10, can be adjusted. The more the bypass valve 13 is closed, the smaller the free cross-sectional area of ​​the bypass device 30. The more the bypass valve 13 is closed, the greater the pressure, and in particular the volumetric flow rate, of the liquid in the main line 5, especially in the pressure chamber 10. The more the bypass valve 13 is closed, the greater the pressure, and in particular the volumetric flow rate, of the liquid in the main line 5 at the discharge opening 6.

[0051] The bypass valve 13 is adjustable by means of the operating device 7, in particular by means of the control element 42, especially based on the control signal. In the exemplary embodiments, the control element 42 serves to adjust the free cross-sectional area of ​​the bypass device 30. By adjusting the bypass valve 13, the pressure, in particular the liquid flow rate, in the main line 5, in particular in the pressure chamber 10, especially at the discharge opening 6, can be regulated.

[0052] By means of the operating device 7, the main line valve 8 can be switched between the fully open state and the closed state, as well as the pressure, in particular the liquid volume flow, in the main line 5, in particular in the pressure chamber 10, can be specified, in particular adjusted.

[0053] The spray unit 11 is movable relative to the pump unit 18. In the exemplary embodiments, the main line 5 between the pump unit 18 and the spray unit 11 is designed as a flexible hose. The spray opening 6 is located on the spray unit 11. The spray unit 11 can be directed with its spray opening 6 at an object to be cleaned. The spray unit 11 is handheld. The operating device 7 is located on the spray unit 11. A user can guide the spray unit 11 with one hand and simultaneously operate the operating device 7 with the same hand.

[0054] The operating device 7 is biased in an unactuated state. Both the valve control element 41 and the control element 42 are independently biased in an unactuated state. A spring, not shown in the figures, can be used for this purpose in each case.

[0055] The main line valve 8 can be moved from the fully closed state to the fully open state by actuating the valve control element 41.

[0056] The control element 42 is located along the in Fig. The actuating element 42 is adjustable within the range shown in Figure 5. The actuating element 31 is also referred to as the adjustment range. Within the adjustment range, the operating element 42 can assume various adjustment positions, particularly depending on the degree of actuation of the operating element 42. It may be provided that the operating element 42 is adjustable only in steps. In the exemplary embodiments, the operating element 42 is continuously adjustable to different adjustment positions within the adjustment range.

[0057] The high-pressure cleaning device 1 includes a detector 15. The detector 15 is in the Fig. 5, Fig. 6 to Fig. Figure 7 is shown schematically. The detector 15 is designed to detect the adjustment position, in particular the degree of actuation, of the operating device 7, especially of the control element 42 of the operating device 7. The detector can detect any continuous adjustment position of the operating device 7, in particular of the control element 42, within the adjustment range, in particular along the travel path 31. The detector 15 may be a Hall sensor. In the exemplary embodiments, the detector 15 is a potentiometer. The operating device 7, in particular the control element 42, and the detector 15 are arranged on the injection unit 11 such that the detection of the adjustment position of the operating device 7, in particular of the control element 42, is possible. The control element 42 interacts with the detector 15 at least indirectly.In the exemplary embodiments, a mechanical connecting element is arranged between the detector 15 and the operating device 3, in particular the control element 42. The mechanical connecting element couples the operating device 7, in particular the control element 42, and the detector 15 to each other. The operating device 7, in particular the control element 42, interacts with the detector 15 by means of the mechanical connecting element.

[0058] The control signal is generated by the detector 15. The control signal is generated indirectly by the operating device 7, in particular the control element 42. Specifically, the control signal is generated indirectly depending on the actuation, in particular the degree of actuation, of the operating device 7, in particular the control element 42. However, the control signal can also be a different signal generated on the signal path between the operating device 7 and the bypass device 30.

[0059] As in the Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the control element 42 is adjustable along its travel path 31, particularly within its adjustment range, from the rest position 37 to positions with increasing distance from the rest position 37. The control element 42 reaches its maximum distance from the rest position 37 in the end position 38. In the end position 38, the control element has traversed its maximum travel path wm. The high-pressure cleaner 1 is designed such that control signals of greater or lesser intensity are generated as the distance of the control element 42 from the rest position 37 increases. In the exemplary embodiments, the intensity of the control signals increases with increasing distance of the control element 42 from the rest position 37. The control signal, and in particular its intensity, depends on the degree of actuation of the control element 42.As the intensity of the control signals increases, the bypass device 30 sets a higher, or at least no lower, pressure, particularly a fluid flow rate, in the main line 5, especially in the pressure chamber 10. When the control element 42 is in the end position 38, it, and in particular the detector 15, generates a control signal of maximum intensity. Then, by means of the bypass device 30, a maximum possible pressure, particularly a fluid flow rate, is set in the main line 5, especially in the pressure chamber 10.

[0060] The distance to the rest position 37 refers to the distance of a reference point on the control element 42 to the rest position 37. In the exemplary embodiments, the control element 42 is a pivoting lever that can be pivoted about a control element pivot axis. In the exemplary embodiment, the reference point is the point on the control element 42 with the greatest distance to the control element pivot axis. The rest position 37 is defined in the exemplary embodiments by the position of the reference point when the control element 42 is not actuated.

[0061] When the control element 42, designed as a pivot lever, is actuated in its rest position 37, the control element 42 – and thus also the reference point – pivots along the travel path 31, particularly within the adjustment range. In this case, the travel path 31 is a circular segment. The distance of the control element 42 to the rest position 37 corresponds to the distance of the reference point to the rest position 37, measured along the circular travel path 31. The reference point moves along a circular path with respect to the pivoting movement about the control element's pivot axis. Alternatively, the distance can be measured as an angular distance of the reference point to the rest position relative to a pivoting movement about the control element's pivot axis.

[0062] In the exemplary embodiments, the valve control element 41 is a pivoting lever that can be pivoted about a valve control element pivot axis. In particular, the valve control element 41 is pivotably mounted about the valve control element pivot axis in the injection unit 11, especially in a housing of the injection unit 11.

[0063] The high-pressure cleaner 1 has a [feature / component] in the Fig. 5, Fig. 6 to Fig. Figure 7 shows the control unit 22. The control unit 22 is arranged in the pump unit 18. It can also be arranged in the spray unit 11. The signal generated by the detector 15, in particular the control signal, is transmitted directly or indirectly, in particular in the form of a wireless signal, especially an electromagnetic signal, transmitted via a radio link. In the exemplary embodiments, this is done by means of the transmitter unit 20. The transmitter unit 20 is arranged on, in particular in, the spray unit 11. The signal received by the control unit 22 is used to influence, in particular to change, in particular to adjust the pressure, in particular the liquid flow rate, in the main line 5, in particular in the pressure chamber 10, especially by means of the bypass device 30.In particular, based on the control signal received by the control unit 22, a pressure signal, especially with a certain intensity and / or shape, is generated by the control unit 22 and transmitted to the bypass device 30, especially wirelessly and / or via cable to the bypass device 30, especially the actuator 16.

[0064] The motor 4 of the high-pressure cleaner 1 has an on state and an off state. In the on state, the motor 4 is driven, in particular supplied with electrical power. In the off state, the motor 4 is not driven, in particular not supplied with electrical power. As in the Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the motor 4 has a switch 26. The switch 26 is used to switch the motor 4 between the on state and the off state.

[0065] As in the Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the high-pressure cleaning device 1 includes a shut-off device 40. The motor 4 can be switched off by means of the shut-off device 40. The shut-off device 40 has an actuating element 27. The switch 26 of the motor 4 can be actuated by means of the actuating element 27. The switch 26 is part of the shut-off device 40.

[0066] The shut-off device 40 serves to switch the motor 4 to the off state. The high-pressure cleaning device 1 is designed such that the shut-off device 40, due to the pressure present in the pressure chamber 10, causes the motor 4 to be in the off state when the pressure in the pressure chamber corresponds to at least a pressure threshold value. In particular, the high-pressure cleaning device 1 is designed such that the fluid in the pressure chamber 10 acts on the actuating element 27 of the shut-off device 40 in such a way that the actuating element 27 actuates the switch 26 of the motor 4, in particular of the shut-off device 40, such that the motor 4 is in the off state when the pressure in the pressure chamber 10 corresponds to at least the pressure threshold value.

[0067] As in the Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, the high-pressure cleaning device 1 includes a pressure relief line 21. The pressure relief line 21 connects the pressure chamber 10 fluidically to the suction chamber 9. Through the pressure relief line 21, a further fluidic connection between the suction chamber 9 and the pressure chamber 10 is possible, separate from the fluidic connection of the suction chamber 9 to the pressure chamber 10 via the high-pressure pump 3 and also separate from the bypass device 30.

[0068] In the exemplary embodiments, the shut-off device 40 is fluidically connected to the pressure chamber 10. The pressure present in the pressure chamber 10 can act on the shut-off device 40. In particular, the shut-off device 40 is arranged, especially at least partially, in the pressure relief line 21. In particular, the actuating element 27 is movably mounted in the pressure relief line 21. In particular, the actuating element 27 is movable due to the pressure present in the pressure chamber 10, especially in the pressure relief line 21, and especially due to the fluid.

[0069] The pressure relief line 21 can be closed or open. A pressure relief valve 24 is arranged in the pressure relief line 21. The pressure relief valve 24 is designed to open when the pressure in the pressure chamber 10 corresponds to at least a pressure threshold value.

[0070] The high-pressure cleaning device 1 includes a check valve 25, as shown in the Fig. 5, Fig. 6, Fig. 7 to Fig. Figure 8 shows the check valve 25 located in the pressure chamber 10. The check valve 25 is located downstream of the bypass device 30, in particular the bypass line 12, in the pressure chamber 10. The check valve 25 is located upstream of the shut-off device 40, in particular upstream of the pressure relief line 21, in particular at the branch point of the pressure relief line from the pressure chamber 10.

[0071] When the motor 4 is running, the high-pressure pump 3 delivers a flow of liquid through the main line 5. In the open position, the main line valve 8 allows liquid to flow through the main line 5. When the main line valve 8 is closed, no more liquid can be delivered through the main line 5. Immediately after the main line valve 8 closes, no more liquid delivered by the high-pressure pump 3 reaches the discharge opening 6. Delivery of liquid by the high-pressure pump 3 is no longer necessary. The motor 4, which drives the high-pressure pump 3, is to be switched off. The shut-off device 40 is provided for this purpose. When the bypass device 30 is closed and the main line valve 8 is closed, the high-pressure pump 3 continues to deliver liquid into the pressure chamber 10.Due to the check valve 25, the liquid cannot flow back out of the pressure chamber 10. The pressure in the pressure chamber 10 rises, and eventually the pressure threshold is reached. When the pressure in the pressure chamber 10 is at least equal to the pressure threshold, the shut-off device 40, due to the pressure present in the pressure chamber 10, causes the motor 4 to switch off. The high-pressure pump 3 is then no longer unnecessarily driven by the motor 4. This saves energy and minimizes wear on the high-pressure cleaner 1.

[0072] The high-pressure cleaning device 1 is designed such that the shut-off device 40 switches the motor 4 to the off state during or after the transition of the main line valve 8 from the open to the closed state. The pressure of the fluid in the pressure chamber 10 exerts a force on the actuating element 27. In particular, the shut-off device 40, and especially the actuating element 27, is biased into an unactuated state. Specifically, the pressure of the fluid in the pressure chamber 10 exerts a force on the actuating element 27 that counteracts the force of a spring 29. The spring 29 is a component of the shut-off device 40. In the exemplary embodiments, the shut-off device 40 comprises the actuating element 27, the switch 26, and the spring 29.The spring 29 biases the shut-off device 40, in this embodiment the actuating element 27, into the unactuated state of the shut-off device 40, in particular the actuating element 27, and in particular the switch 26 of the motor 4. To actuate the switch 26, a force must be exerted by the fluid in the pressure chamber that moves the actuating element 27 towards the switch 26 against the force of the spring 29. When the pressure of the fluid in the pressure chamber 10 exerts a force on the actuating element 27 that is greater than the force of the spring 29, the actuating element 27 is moved towards the switch 26. The switch 26 is actuated. This puts the motor 4 into the off state. Consequently, no more fluid is pumped by the high-pressure pump 3 into the pressure chamber 10.

[0073] The pressure relief valve 24 has a valve element. In the exemplary embodiments, the valve element is movable together with the actuating element 27. This results in a particularly simple and space-saving design of the pressure relief valve 24 and the shut-off device 40. The shut-off device 40 is subjected to only a single pressure value from the pressure chamber 10 at any given time. The pressure of the suction chamber 9 is present on the other side of the shut-off device 40. This results in a simple structural design of the shut-off device 40.

[0074] In the exemplary embodiments, the pressure relief valve 24 opens when the pressure threshold in the pressure chamber 10 is exceeded. The pressure threshold is also referred to as the pressure relief threshold. When the pressure in the pressure chamber 10 in the area between the check valve 25 and the main line valve 8 is at least equal to the pressure threshold, both the pressure relief valve 24 is open and the motor 4 is in the off state due to the pressure present in the pressure chamber 10. In the exemplary embodiments, the high-pressure cleaning device 1 is designed such that the pressure in the pressure chamber 10 is at least equal to the pressure relief threshold after the main line valve 8 has been switched from the open to the closed state, particularly when the main line valve 8 is in transition from the fully open to the closed state, and especially when the main line valve 8 is not in the fully open state.The pressure increase in pressure chamber 10 occurs because the high-pressure pump 3 continues to deliver fluid into pressure chamber 10 and the main line valve 8 remains closed. First, the valve element of the pressure relief valve 24 must be moved from its rest position. This requires a higher pressure than is subsequently required for the valve element to slide into an open position of the pressure relief valve 24. Therefore, after the main line valve 8 closes, a pressure initially builds up that is higher than the pressure subsequently required to keep the motor 4 off by means of the shut-off device 40. The pressure value in pressure chamber 10 required to keep the motor 4 off by means of the shut-off device 40 is referred to as the motor holding value. The pressure threshold is higher than the motor holding value. It is also conceivable that the pressure threshold corresponds to the motor holding value.In particular, a design without a pressure relief valve can also be provided. If the pressure threshold corresponding to the motor holding value is exceeded, the motor is simply switched off. Pressure relief of the pressure chamber is not provided in such embodiments. In these embodiments, after the pressure threshold in pressure chamber 10 is exceeded, fluid can flow back from pressure chamber 10 into suction chamber 9 through the pressure relief line 21 due to the opening of the pressure relief valve 24, as shown in the illustrations. Fig. 5, Fig. 6, Fig. 7 to Fig. Figure 8 shows this. This ensures a partial pressure equalization between the pressure chamber 10 and the suction chamber 9.

[0075] As soon as the pressure in the part of pressure chamber 10 between check valve 25 and main line valve 8 falls below the pressure threshold, also known as the pressure relief threshold, pressure relief valve 24 closes pressure relief line 21 again. At this point, the pressure in the part of pressure chamber 10 between check valve 25 and main line valve 8 is greater than the motor holding value. In this state, pressure relief valve 24 is in an intermediate position. In this intermediate position, pressure relief valve 24 is closed. Simultaneously, the valve element of pressure relief valve 24 ensures that motor 4 remains in the off state.In the exemplary embodiments, the valve element of the pressure relief valve 24 is operatively connected to the actuating element 27 of the shut-off device 40 such that the actuating element 27 actuates the switch 26 of the motor 4, causing the motor 4 to be in the off state when the pressure in the part of the pressure chamber 10 between the check valve 25 and the main line valve 8 exerts a pressure on the shut-off device 40 that is at least equal to the motor holding pressure. The force acting on the actuating element 27 due to the holding pressure is sufficient to press the actuating element 27 against the switch 26. The motor 4 remains in the off state. The pressure relief valve 24 is closed. The pressure in the part of the pressure chamber 10 between the check valve 25 and the main line valve 8 lies within a holding pressure range. This holding pressure range is between the motor holding pressure and the pressure threshold.In this state of the high-pressure cleaner 1, the check valve 25, the pressure relief valve 24, and the main line valve 8 are closed, and the shut-off device 40 causes the motor to be in the off state. This state remains stable until the main line valve 8 is opened and the pressure in the section of the pressure chamber 10 between the check valve 25 and the main line valve 8 falls below the motor holding value. At that point, the force exerted on the actuating element 27 by the pressure in the section of the pressure chamber 10 between the check valve 25 and the main line valve 8 is no longer sufficient to press the actuating element 27 against the force of the spring 29 on the switch 26. As soon as the switch 26 is no longer pressed, it springs back to its unactuated state, and the motor 4 is switched on. The switch 26 is biased in its unactuated state.A spring (not shown) may be used for this purpose. However, another mechanism may also be employed. Typically, switch 26 is a microswitch.

[0076] As described above, the high-pressure cleaning device 1 is designed such that, in the unactuated state of the control element 42, the size of the free cross-sectional area of ​​the bypass device 30 is maximized. However, this is not the case in every situation. For the pressure threshold to be reached in the pressure chamber 10 when or after the main line valve 8 closes, the size of the free cross-sectional area of ​​the bypass device 30 must be small enough, regardless of whether the control element 42 is actuated, or in particular, whether it is actuated to a certain degree, that the pressure in the pressure chamber 10 is at least equal to the pressure threshold when the main line valve 8 is closed and the motor 4 is running.Accordingly, the bypass valve 13 reduces the size of the free cross-sectional area, independently of any actuation of the control element 42, and in particular of the degree of actuation of the control element 42, to at least such a small extent that the pressure in the pressure chamber 10 corresponds at least to the pressure threshold value when the main line valve 8 is in the closed state and the motor 4 is simultaneously in the on state. In particular, the bypass valve 13, and in particular the actuator 16, reduces the size of the free cross-sectional area, independently of any actuation of the control element 42, and in particular of the degree of actuation of the control element 42, at least to such an extent that the pressure in the pressure chamber 10 corresponds at least to the pressure threshold value when the main line valve 8 is in the closed state and the motor 4 is simultaneously in the on state. In the exemplary embodiments, this is controlled by the control unit 22.

[0077] When the main line valve 8 is in the closed state and the motor 4 is simultaneously in the on state, the flow of fluid through the bypass device 30 by means of the bypass valve 13 is prevented in the exemplary embodiments. In particular, the control unit 22 controls the actuator 16 in this situation so that the bypass device 30 is closed. In other words, the cross-sectional area of ​​the bypass device is zero.

[0078] In particular, it is provided that the bypass valve 13, in particular the actuator 16, in particular the control unit 22, adjusts the size of the free cross-sectional area of ​​the bypass device 30 independently of any actuation of the control element 42, in particular independent of the degree of actuation of the control element 42, at least so small, in particular reduced to such an extent that the pressure in the pressure chamber 10 corresponds at least to the pressure threshold value when the main line valve 8 is in transition from the fully open state to the closed state, in particular when the main line valve is not in the fully open state, and at the same time the motor is in the on state.

[0079] 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 device 30 for a start-up phase of the motor 4, independently of the degree of actuation of the control element 42, so that the bypass device 30 fluidically connects the pressure chamber 10 and the suction chamber 9. This allows fluid to flow from the pressure chamber 10 through the bypass device 30 into the suction chamber 9 during the start-up phase. This reduces the pressure against which the motor 4 has to work during the start-up phase. The motor 4 can circulate the fluid during the start-up phase using the high-pressure pump 3. Specifically, the pressure relief line 21, and in particular the pressure relief valve 24, is closed during the start-up phase. Specifically, the pressure in the pressure chamber 10 is lower than the pressure threshold during the start-up phase.

[0080] The start-up phase of the motor 4 ends when a termination condition is met. In the exemplary embodiments, the termination condition is met when a time interval, measured from the start of the motor 4, has elapsed. The start of the motor 4 is effected, in particular, by the control unit 22. Alternatively or additionally, it can also be provided that the control unit receives information about the start time of the motor 4. The start of the motor 4 is triggered, in particular, by actuating the operating device 7, especially the valve control element 41. In particular, the control unit 22 measures the time interval measured from the start of the motor 4. The time interval is from 150 ms to 300 ms, in particular from 200 ms to 250 ms.

[0081] Alternatively, it can also be provided that the termination condition is met when a starting volume threshold, in particular a starting pressure value, is exceeded in pressure chamber 10. Specifically, the starting pressure value is lower than the pressure threshold. Specifically, the motor holding value is higher than the starting pressure value. Suitable measuring devices can be provided for measuring the starting pressure value and / or the starting volume threshold. In particular, the measured values ​​from the corresponding measuring devices can be transmitted to the control unit 22.

[0082] The bypass valve 13, in particular the actuator 16, and in particular the control unit 22, adjusts the free cross-sectional area for the start-up phase of the motor 4 such that pressure equalization occurs between the pressure chamber 10 and the suction chamber 9 through the bypass device 30, and in particular through the bypass line 12. Specifically, the bypass valve 13, in particular the actuator 16, and in particular the control unit 22, adjusts the free cross-sectional area for the start-up phase of the motor to its maximum size. This allows the volume flow in the bypass device 30, and in particular through the bypass valve 13, to be maximized. This ensures that the pressure against which the motor 4 has to work during the start-up phase is minimized.

[0083] By using the bypass device 30, in particular the bypass valve 13, in particular the actuator 16, in particular the control unit 22, to reduce, and in particular minimize, the back pressure on the motor 4, in particular on the high-pressure pump 3, during the start-up phase, further structural measures, such as providing a separate start line that offers an additional fluidic connection between pressure chamber 10 and suction chamber 9, can be dispensed with. A start valve is also unnecessary. This saves costs and installation space and allows for a simple design of the high-pressure cleaning device 1.

[0084] By using the bypass device 30, in particular the bypass valve 13, in particular the actuator 16, in particular the control unit 22, to adjust the size of the free cross-sectional area of ​​the bypass device 30 to a minimum such that the pressure in the pressure chamber 10 corresponds at least to the pressure threshold when the main line valve 8 is closed and the motor 4 is simultaneously running, structural measures such as providing a pressure build-up valve in the bypass line can be dispensed with. This also saves costs and installation space and ensures a simple design for the high-pressure cleaning device 1.The bypass device 30, which is actually intended for regulating the pressure in pressure chamber 10, is cleverly used to establish a fluidic connection between pressure chamber 10 and suction chamber 9 during the start-up phase of the motor 4 and / or to reach the pressure threshold in pressure chamber 10 when the main line valve 8 is closed and the motor 4 is simultaneously running, so that the motor 4 can be switched off by means of the shut-off device 40. In both cases, this is an additional use of the bypass device 30.

[0085] The high-pressure cleaner 1 operates in start-up mode during the start-up phase. When the main line valve 8 is closed and the motor 4 is off, the high-pressure cleaner 1 operates in pressure relief mode. Outside of start-up and pressure relief modes, the high-pressure cleaner 1 operates in normal mode, particularly when the main switch 19 is on.

[0086] The size of the free cross-sectional area of ​​the bypass device 30 depends solely on the actuation, in particular the degree of actuation, of the control element 42 when the main line valve 8 is in the fully open position and / or when the high-pressure cleaner 1 is outside the start-up phase. During normal operation of the high-pressure cleaner 1, the size of the free cross-sectional area of ​​the bypass device 30 depends solely on the degree of actuation of the control element 42. In particular, during normal operation, a control signal generated by actuation of the control element 42 is no longer overridden by the control unit 22.

[0087] After completion of the start-up phase and / or when the main line valve 8 is in the fully open state, especially during normal operation, the pressure in the pressure chamber 10 of the main line 5 can be adjusted depending on the degree of actuation of the control element 42.

[0088] In particular, it is intended that outside the start-up phase and / or when the main line valve 8 is in the fully open state, especially during normal operation, the size of the free cross-sectional area does not increase, and in particular decreases, with increasing actuation of the control element 42. This applies especially when the main line valve 8 is in the fully open state. In particular, the pressure in the pressure chamber 10 of the main line 5 increases or remains constant when the actuation of the control element increases, especially during normal operation.

[0089] The start-up phase can be triggered multiple times in succession. It can be triggered when the motor 4 is first switched on using the main switch 19 after the high-pressure cleaner 1 has been switched on. The start-up phase can also be triggered when the shut-off device 40 no longer causes the motor 4 to be in the off state. In particular, when the switch 26 is no longer actuated by the actuating element 27, the motor 4 is switched on, and the start-up phase begins. In the exemplary embodiments, the bypass device 30, in particular the bypass valve 13, is then fully opened, regardless of the actuation, in particular the degree of actuation, of the operating element 42. This continues until the start-up phase ends, in particular because the termination condition is met. Afterward, the high-pressure cleaner 1 operates in normal mode.

[0090] In particular, the main line valve 8 is closed during the start-up phase. However, it is also possible for the main line valve 8 to be opened or open during the start-up phase. After the start-up phase has ended, the high-pressure cleaning device 1 is operated in normal mode, and the size of the free cross-sectional area of ​​the bypass device 30 depends solely on the degree of actuation of the control element 42.

Claims

[1] High pressure cleaning equipment comprising: - a high-pressure pump (3), - a main line (5) through which liquid can be pumped by means of the high-pressure pump (3), - a main line valve (8) arranged in the main line (5), wherein the main line valve (8) has a closed state and a fully open state, - a motor (4) for driving the high-pressure pump (3), wherein the motor (4) has an on state and an off state, - a shutdown device (40) with which the motor (4) can be brought into the off state, and - a control element (42), wherein the main line (5) upstream of the high-pressure pump (3) has a suction chamber (9), wherein the main line (5) downstream of the high-pressure pump (3) has a pressure chamber (10), wherein a bypass device (30) for fluidic connection between the pressure chamber (10) and the suction chamber (9) is arranged, wherein the bypass device (30) comprises a bypass valve (13), wherein the size of the free cross-sectional area of ​​the bypass device (30) is adjustable by means of the control element (42) for regulating the pressure in the pressure chamber (10) by means of the bypass valve (13), wherein the high-pressure cleaning device (1) is designed such that the shut-off device (40) causes the motor (4) to be in the off state due to the pressure present in the pressure chamber (10) when the pressure in the pressure chamber (10) corresponds to at least a pressure threshold value, characterized by, that the high-pressure cleaning device (1) is designed such that the bypass valve (13) adjusts the size of the free cross-sectional area independently of any actuation of the control element (42) to at least such a small size, in particular to such an extent, that the pressure in the pressure chamber (10) corresponds at least to the pressure threshold when the main line valve (8) is in the closed state and at the same time the motor (4) is in the on state. [2] High-pressure cleaning device according to claim 1, characterized by , that the flow of fluid through the bypass device (30) by means of the bypass valve (13) is prevented when the main line valve (8) is in the closed state and at the same time the motor (4) is in the on state. [3] High-pressure cleaning device according to claim 1 or 2, characterized by, that the bypass valve (13) adjusts the size of the free cross-sectional area independently of any actuation of the control element (42) to at least such a small size, in particular to such an extent that the pressure in the pressure chamber (10) corresponds at least to the pressure threshold value, when - the main line valve (8) is in the transition from the fully open state to the closed state and - at the same time the motor (4) is in the on state. [4] High-pressure cleaning device according to one of claims 1 to 3, characterized by , the bypass valve (13) adjusts the size of the free cross-sectional area independently of actuation of the control element (42) to at least such a small extent, in particular to such an extent that the pressure in the pressure chamber (10) corresponds at least to the pressure threshold value, when - the main line valve (8) is not in the fully closed state and - at the same time the motor (4) is in the on state. [5] High-pressure cleaning device according to any one of claims 1 to 4, characterized by , that the shut-off device (40) is fluidically connected to the pressure chamber (10). [6] High-pressure cleaning device according to any one of claims 1 to 5, characterized by , that the size of the free cross-sectional area depends exclusively on the actuation of the control element (42) when the main line valve (8) is in the fully open state. [7] High-pressure cleaning device according to any one of claims 1 to 6, characterized by , that the size of the free cross-sectional area depends on the degree of actuation of the control element (42) when the main line valve (8) is in the fully open state, and in particular that the size of the free cross-sectional area does not increase with increasing degree of actuation of the control element (42), and in particular decreases when the main line valve (8) is in the fully open state. [8] High-pressure cleaning device according to any one of claims 1 to 7, characterized by , that the bypass valve (13) is adjustable by means of an actuator (16). [9] High-pressure cleaning device according to any one of claims 1 to 8, characterized by , that the main line valve (8) can be actuated by means of a valve control element (41), in particular that it can be switched between the fully open state and the closed state. [10] Method for operating a high-pressure cleaning device (1), wherein the high-pressure cleaning device (1) comprises: - a high-pressure pump (3), - a main line (5) through which liquid can be pumped by means of the high-pressure pump (3), - a main line valve (8) arranged in the main line (5), wherein the main line valve (8) has a closed state and a fully open state, - a motor (4) for driving the high-pressure pump (3), wherein the motor (4) has an on state and an off state, - a shutdown device (40) with which the motor (4) can be brought into the off state, and - a control element (42), wherein the main line (5) upstream of the high-pressure pump (3) has a suction chamber (9), wherein the main line (5) downstream of the high-pressure pump (3) has a pressure chamber (10), wherein a bypass device (30) for fluidic connection between the pressure chamber (10) and the suction chamber (9) is arranged, wherein the bypass device (30) comprises a bypass valve (13), wherein the size of the free cross-sectional area of ​​the bypass device (30) is adjustable by means of the control element (42) for regulating the pressure in the pressure chamber (10) by means of the bypass valve (13), wherein the high-pressure cleaning device (1) is designed such that the shut-off device (40) causes the motor (4) to be in the off state due to the pressure present in the pressure chamber (10) when the pressure in the pressure chamber (10) corresponds to at least a pressure threshold value, characterized by, that the size of the free cross-sectional area is set at least so small, in particular reduced to such an extent, that the pressure in the pressure chamber (10) corresponds at least to the pressure threshold value when the main line valve (8) is in the closed state and at the same time the motor (4) is in the on state, regardless of whether the control element (42) is actuated by means of the bypass valve (13).

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