Electric high-pressure cleaning device

Abstract

The present invention relates to an electric high-pressure cleaning apparatus, comprising a support device (12), an electric motor (14) held on and / or arranged on the support device (12), a pump (16) drivable by the electric motor (14), an electric device (18) and a user-guided operating unit (34) which may be connected to the pump (16) via a high-pressure conduit (30), the electric device (18) comprising two connection lines (44, 46) via which the electric motor (14) is connected to or may be connected to a power supply device (52) in a bipolar manner and through which electrical energy can be supplied to the electric motor (14). In order to provide a more user-friendly high-pressure cleaning apparatus (10), according to the present invention, an electric device (18) comprises at least one switching element (60) connected by at least one connection line (44, 46), a control unit (62), and a first communication member (66), and an operation unit (34) comprises an actuation element (74) and a second communication member (68) for wirelessly transmitting a signal to the first communication member (66), and the control unit (62) is operably connected to the at least one switching element (60), and the at least one connection line (44, 46) is conductively connected or electrically interrupted depending on the actuation of the actuation element (74).

Description

Technical Field

[0001] The present invention relates to an electric high-pressure cleaning device comprising a support device, an electric motor held on and / or arranged on the support device, a pump that can be driven by the electric motor, an electric device, and a user guidance operation unit that can be connected to or is connected to the pump via a high-pressure conduit. The electric device comprises two or more electric connection lines. Via the electric connection lines, the electric motor is or can be connected to a power supply device in a bipolar manner and can supply electrical energy to the electric motor, and a connection with three or more poles is conceivable.

Background Art

[0002] In such a high-pressure cleaning device, a cleaning liquid, especially water, can be pressurized for cleaning purposes. A supply line can be connected or can be connected, for example, to the pump inlet. During operation of the high-pressure cleaning device, the cleaning liquid is pressurized by a pump, for example an axial piston pump. During operation, the high-pressure conduit is connected to the pump outlet so that the pressurized cleaning liquid can be supplied to the operation unit. A release element, for example a manual trigger, can be arranged on the operation unit and, when actuated, can spray the cleaning liquid. The operation unit comprises or forms, for example, a so-called gun on which a spray lance for spraying the cleaning liquid can be arranged.

[0003] Two connection lines are provided, and via these two connection lines, the high-pressure cleaning device is connected to a power supply device during operation in order to supply electrical energy to the electric device. In this case, at least one bipolar connection is provided, but a three-pole or multi-pole connection can be provided.

[0004] US 2016 / 0067726 A1 describes a high-pressure washer having an internal combustion engine or an electric motor. Sensors for detecting the presence of hands on the handle and spray lance are located on the operating unit. When the manual trigger is pulled, the internal combustion engine or electric motor is turned on.

[0005] US 2020 / 0086357 A1 discloses a high-pressure cleaning device having an internal combustion engine that can be started and stopped via wireless remote control.

[0006] DE 34 02 450 A1 describes a control circuit for a high-pressure cleaning device. A pressure switch is provided to cut off the flow of current to the electric motor when the operating unit is not in operation. In a further embodiment, the supply line is cut off by a timer after a predetermined downtime has elapsed. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] US 2016 / 0067726 A1 [Patent Document 2] US 2020 / 0086357 A1 [Patent Document 3] DE 34 02 450 A1 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The object of the present invention is to provide a high-pressure cleaning device of the type described above, but more user-friendly. [Means for solving the problem]

[0009] In a typical high-pressure cleaning device, this objective is achieved, according to the present invention, by comprising an electrical device comprising at least one switching element connected by at least one connection line, a control unit, and a first communication member, wherein the operating unit comprises an operating element and a second communication member for wirelessly transmitting a signal to the first communication member, the control unit being operably connected to the at least one switching element, and the at least one connection line being electrically connected or electrically disconnected in response to the operation of the operating element.

[0010] In the high-pressure cleaning apparatus according to the present invention, at least one connection line can be indirectly electrically connected or electrically disconnected by the user via the operating element located on the operating unit. This preferably allows the high-pressure cleaning apparatus to be connected or switched on from the operating unit in a ready-to-operate state without the operating unit being present on the support device (the support device comprising or forming the housing of the high-pressure cleaning apparatus) when work is started, or to be shut down when work is finished. This is preferably possible even when the user is spatially separated from the high-pressure cleaning apparatus, for example, when the high-pressure hose forming the high-pressure conduit is extended. For this purpose, it has been found to be particularly advantageous to wirelessly transmit signals via wireless connections between the communication members. Wireless transmission is independent of the physical transmission channel. Thus, the advantages of the present invention can also be achieved, for example, when different types of high-pressure conduits, such as high-pressure hoses of different lengths, are used with the high-pressure cleaning apparatus. Preferably, the operating element on the support device for switching the ready-to-operate high-pressure cleaning apparatus on or connecting, and / or switching the high-pressure cleaning apparatus off can be omitted, as described below.

[0011] The connection line may be, for example, a stranded wire connection line. The connection cable may have two or more connection lines, for example, a plug for connection to a power network.

[0012] Needless to say, the electrical device does not have to be completely powered off when voltage is applied by the power supply connection and / or battery of the high-pressure washer. For example, the control unit can supply current, such as a control current. However, the at least one connection line is conductively connected via the switching element so that it can supply electrical energy to the electric motor by current, such as a power current, or so that it can electrically disconnect the electric motor to prevent the flow of current.

[0013] Regarding reliable communication connections between the communication components, it is advantageous, for example, if unique identification is possible between the communication components. An arbitrary identification tag may already be stored in the communication components by the manufacturer, for example, and they may already be linked (paired) with each other. Alternatively, or in addition to this, the user may be able to link and / or require this before the high-pressure washer is started or during operation. The identification tag may be, for example, the MAC address of the communication component.

[0014] The connection line can be electrically connected and / or disconnected via the switching element by at least one pole. It is conceivable that two or more poles, in particular all poles, are connected.

[0015] In particular, the high-pressure washer can be switched to a standby mode when the connection lines are electrically connected, and the electric motor can be switched on only when the user activates a release element on the operating unit to spray the cleaning fluid. In standby mode, the high-pressure washer is ready to operate, but the electric motor is not yet switched on. In this preferred embodiment, this is done only by activating the release element, for example, a manual trigger on the operating unit. Further connection lines can be electrically connected, for example, via a pressure switch described later, to allow current to flow through the electric motor in response to the activation of the release element.

[0016] A permanent wireless connection can be established between the communication members from the time the at least one connection line is electrically connected for the first time by activating the actuation element until the at least one connection line is electrically disconnected by activating the actuation element. This wireless connection can be established between the communication members, but can be configured to be passive when the operating unit is not activated.

[0017] The wireless connection between the communication components is, for example, Bluetooth-based, but other types of wireless connections familiar to those skilled in the art may be provided instead or in addition.

[0018] In particular, with respect to the simple structural configuration of the high-pressure cleaning apparatus, it is advantageous that the electrical device does not include any further switching elements connected by the at least one connection line, in addition to the switching elements operably connected to the control unit.

[0019] The high-pressure washer is advantageous in that, in order to electrically connect the at least one connection line, there is no operating element on the support device for the user, particularly as a component of the electrical device. Therefore, the operating element on the operating unit can form a "main switch" for the user, via which the high-pressure washer can be switched on when it is connected or ready to operate. On the other hand, the support device of the high-pressure washer, such as the housing, does not have a "main switch" to act on a switching element connected by at least one of the connection lines. As a result, the high-pressure washer has a structurally simple configuration. After connecting the operating unit to the high-pressure conduit, coupling the high-pressure washer to the power device, and connecting the supply line for the cleaning fluid, the high-pressure washer can be operated in a user-friendly manner via the operating unit, thereby allowing the user to remain spatially separated from the support device.

[0020] As is apparent from the above-described embodiments, separately from the operating element, the high-pressure cleaning device preferably does not include a further operating element for switching on or connecting the high-pressure cleaning device that is ready for operation and / or for switching off the high-pressure cleaning device, i.e., a "main switch" for the user.

[0021] The control unit is preferably galvanically insulated from the at least one connection line via the switching element.

[0022] In particular, for the last-mentioned purpose, for example, the switching element can be or can include a relay.

[0023] The signal transmitted from the second communication member to the first communication member can be a digital signal or an analog signal.

[0024] In a preferred embodiment, the signal can be a pulse signal that can be digital (e.g., 0 / 1 / 0 for switching on and switching the switch back to its original off state). In this way, a permanent radio signal can be omitted in order to minimize the power consumption of the operating unit.

[0025] During operation of the high-pressure cleaning device, the control unit can monitor the connection line conductively connected with respect to the flow of current to the electric motor (the flow of current for supplying power to the electric motor) and / or with respect to the voltage drop across both ends of the electric motor. If there is no flow of current and / or no voltage drop, it is advantageous if the control unit can provide a display to the user via the display unit of the high-pressure cleaning device, particularly the display unit. For example, the flow of current and / or the voltage drop is checked by the control unit at time intervals, particularly periodically, thereby monitoring the connection line. If no current is flowing or there is no voltage drop, the control unit can assume that there is a fault in the electric device. The display can be provided via the display unit, particularly displayed on the display unit.

[0026] Alternatively or additionally, the high-pressure cleaning device can be monitored during operation with respect to the occurrence of a pressure drop in the cleaning liquid, for example, in the pressure chamber of the high-pressure pump or at the pump outlet. For this purpose, the high-pressure cleaning device can comprise, for example, a pressure sensor or a pressure switch. If there is a pressure drop, the control unit can assume that there is a fault. The indication can be given via the display unit, in particular, it can be displayed on a display unit.

[0027] The display unit can comprise a controllable image display.

[0028] It is advantageous if the operating unit comprises or forms the display unit and can transmit a corresponding display signal from the first communication member to the second communication member. Thereby, it becomes possible to notify the user in a user-friendly manner by the control unit that there is no current flowing and / or there is no voltage drop and / or the cleaning liquid is not highly pressurized. The indication can in particular be or can include a fault message that preferably proposes possible steps to the user for correcting the fault.

[0029] The actuating element can comprise or form the display unit.

[0030] When at least one connection line is electrically connected, a test signal can be transmitted from the control unit to the second communication member via the first communication member, and a confirmation signal in response to the test signal can be transmitted from the second communication member to the first communication member. If the confirmation signal is not present, it may be advantageous for the connection line to be electrically disconnected. If the control unit determines that no confirmation signal is received in response to the test signal, the control unit may assume that the wireless connection to the operating unit has been disconnected or that a wireless connection cannot be established. For safety reasons, in this case, it is advantageous to electrically disconnect the connection line and thereby terminate the operation of the high-pressure cleaning device.

[0031] The test signal may preferably be transmitted repeatedly, and especially periodically. The connection line is preferably disconnected after a predetermined number of acknowledgment signals have been absent or after a predetermined amount of time has elapsed. This prevents the high-pressure washer from shutting down if only one acknowledgment signal is absent, for example, if the wireless connection is temporarily interrupted.

[0032] In relation to this patent application, "predetermined" can also include "can be determined in advance."

[0033] In practice, it is advantageous, for example, if the connection line is electrically disconnected only after a period of a few seconds in which no confirmation signal is received. For example, a period of approximately 2 to 30 seconds is possible.

[0034] Tests relating to current and / or voltage drop and / or pressure drop, and / or transmission of test signals, can be performed, for example, every second or less.

[0035] The operating unit preferably comprises at least one battery, which may be replaceable and / or rechargeable, for supplying power to the operating element.

[0036] It is preferable that the charge level of the at least one battery can be displayed on the display unit, particularly the display unit, of the operating unit, and / or that a display be given when the at least one battery falls below a predetermined charge level. Depending on whether the charge level is displayed and / or indicated, the user can, for example, replace and / or charge the at least one battery. This ensures that power is supplied to the operating elements in order to ensure the switching behavior of the control unit as desired by the user.

[0037] For example, when the operating element is activated, if at least one battery falls below a predetermined charge level, a signal can be prevented from being transmitted from the second communication member to the first communication member. In this case, the user needs to replace and / or charge at least one battery to start the high-pressure washer.

[0038] As already mentioned, the operating unit may include, for example, a release element, such as a manual trigger. The operating unit for spraying the cleaning fluid may be actuated via the release element. It is particularly advantageous if the release element is different from the actuating element. For example, the high-pressure cleaning device can be switched to standby mode by activating the actuating element, in which case, for example, the electric motor has not yet been started. The electric motor can be started via the release element, for example using a pressure switch described later, and the cleaning fluid can be sprayed.

[0039] It may be advantageous if the high-pressure cleaning device could be completely or partially shut down when it is not in operation. For example, the display unit of the control unit or its background lighting could be switched off after about 3 to 10 minutes of inactivity. For example, the high-pressure cleaning device could be shut down after about 10 to 30 minutes of inactivity.

[0040] For example, the control unit electrically disconnects the at least one connection line via the at least one switching element if a predetermined period of time has elapsed during which the release element is not activated.

[0041] Alternatively, or in addition, to supply electrical energy to the electric motor, the at least one connection line to the electric motor may be electrically disconnected if a predetermined period of time has elapsed during which no current is detected through the at least one connection line. As described above, even if the connection line is disconnected but there is no power current to the electric motor, current may still flow through the electrical device.

[0042] The high-pressure cleaning device preferably includes a pressure switch capable of detecting the pressure inside the pump or downstream of the pump. For example, the pressure of the cleaning fluid is detected in or within the pump chamber of the pump to which the high-pressure conduit is connected during operation.

[0043] The pressure switch preferably comprises a further switching element, or is operably connected to such a switching element connected to one of the connection lines, the further switching element electrically conductively connecting the connection line when the pressure falls below the threshold pressure, and disconnecting the connection line when the pressure reaches and / or exceeds the threshold pressure. A connection line for supplying electrical energy to the electric motor may be electrically connected via the pressure switch. For this purpose, for example, the release element is activated so that the pressure drops below the threshold pressure and the electric motor starts. In contrast, if the release element is no longer activated, the pressure rises above the threshold, the electrical connection line is disconnected, and the electric motor stops operating.

[0044] Only one connection line (unipolar) can be connected via an additional switching element. Alternatively, a multipolar or all-polar circuit for all connection lines is conceivable.

[0045] In a preferred embodiment of the present invention, the further switching element is connected by a different connection line than the switching element which is operated in response to the operation of the operating element in the high-pressure cleaning device according to the present invention. This provides the possibility of bipolar isolation, particularly full-polar isolation, when two connection lines are present.

[0046] As mentioned above, omitting the "main switch" of the support device is also advantageous for high-pressure cleaning devices operated by the pressure switch. In conventional high-pressure cleaning devices, the main switch on the housing of the high-pressure cleaning device remains switched on even when work is interrupted. In the event of a leak, this results in a pressure drop and therefore repeated starting of the electric motor. This is undesirable as it places an unnecessary load on the electric motor and pump. In contrast, in a preferred embodiment of the high-pressure cleaning device according to the present invention, at least one connection line may be electrically disconnected as a result of the operation stopping. Even if the pressure drops due to a leak, the electric motor will not start by disconnecting one of the connection lines with the pressure switch because of the single-pole insulation of at least the connection line.

[0047] The high-pressure cleaning device may be wired and may have a connecting cable equipped with the connecting lines. The connecting cable may, for example, have a plug and be plugged into a socket of a commercial power device.

[0048] Alternatively, or in addition to the above, the high-pressure cleaning device may be battery-operated and have a receptacle for an electric battery that can be connected to the connection line.

[0049] As already mentioned, the high-pressure cleaning device may include a housing. For example, the support device includes the housing of the high-pressure cleaning device, which houses the electric motor, the pump, and at least partially, for example, some of the possible connecting cables.

[0050] The following description of preferred embodiments of the present invention will be useful in conjunction with the drawings to illustrate the invention in more detail. [Brief explanation of the drawing]

[0051] [Figure 1] A schematic perspective view of a high-pressure cleaning device according to the present invention in a preferred embodiment. [Figure 2] Schematic block diagram of the high-pressure cleaning device shown in Figure 1. [Modes for carrying out the invention]

[0052] The figure shows a preferred embodiment of the high-pressure cleaning device according to the present invention, collectively referred to as reference numeral 10, for cleaning an object by a user (not shown) operating the high-pressure cleaning device 10.

[0053] The high-pressure cleaning device 10 comprises a support device 12, an electric motor 14, a pump 16, and an electrical device 18, all of which are located on the support device 12. The support device 12 includes a housing 20 that forms a receiving space 22. At least a portion of the electric motor 14, the pump 16, and the electrical device 18 are located in the receiving space 22.

[0054] When the high-pressure cleaning device 10 is used as intended, a supply conduit 26 for supplying pressurized cleaning fluid, particularly water, is connected to the pump inlet 24 of the pump 16. The high-pressure conduit 30, in this case designed as a hose line 32, is connected to the pump outlet 28.

[0055] The high-pressure cleaning device 10 has a user-guided operating unit 34 designed as a high-pressure gun 36 in this example. The operating unit 34 is connected to a hose line 32 and thus fluid is connected to the pump outlet 28. A release element 38 in the form of a manual trigger 40 is located on the operating unit 34.

[0056] The supplied cleaning fluid is pressurized by a pump 16, for example, an axial piston pump. When the manual trigger 40 is activated, a valve located in the operating unit 34 opens, allowing the cleaning fluid to be sprayed through a spray lance 42 also located in the operating unit 34.

[0057] The electrical device 18 includes connection lines 44 and 46 for supplying electrical energy to the device 18, particularly to the electric motor 14. In this case, bipolar connections are made with the two connection lines 44 and 46. As already described, connections with three or more poles can be provided.

[0058] The electrical device 18 includes a power supply device 52, and a connection cable 48 having connection lines 44, 46 having a plug 50 for connecting to a conventional power network.

[0059] Alternatively, or in addition to the above, as shown by the dashed line in Figure 2, the high-pressure cleaning device 10 can be operated by at least one battery 54 as a power supply device 52. To house the battery 54, the high-pressure cleaning device 10 includes a receptacle 56 formed, for example, by a housing 20. When placed within the receptacle 56, the battery 54 is coupled to connection lines 44, 46.

[0060] The electrical device 18 includes a switching element 60 connected by a connection line 44, which in this example includes a relay 58. The relay 58 is operably connected to a control unit 62 of the electrical device 18. The control unit 62 is galvanically isolated from the connection line 44 via the switching element 60.

[0061] The control unit 62 is also connected to the connection line 44 via the connection part 64 to detect the current flow within it and / or the voltage drop across the ends of the electric motor 14.

[0062] When plug 50 is plugged in or battery 54 is inserted, a voltage can be applied to the electrical device 18, in particular the control unit 62. This allows a current to flow, for example, in the sense of a control current. However, as long as the connection line 44 is electrically disconnected via the switching element 60, no current can flow through the electric motor 14.

[0063] The electrical device 18 includes, for example, a first communication member 66 provided in the control unit 62. The operating unit 34 includes a second communication member 68, which is incorporated, for example, into an operating element 74, which will be described later.

[0064] Communication components 66 and 68 are designed for wireless transmission of signals between the operating unit 34 and the control unit 62. In particular, this enables a bidirectional wireless connection 69. For example, a Bluetooth wireless connection can be used.

[0065] The high-pressure cleaning device 10 also has a pressure switch 70 having a switching element 72 connected by a connection line 46. The pressure of the cleaning fluid in the pump 16 can be detected via the pressure switch 70, for example, in the pressure chamber to which the high-pressure conduit 30 is connected.

[0066] If the pressure is below the threshold pressure, the connection line 46 is electrically connected. If the pressure is above the threshold pressure, the connection line 46 is electrically disconnected.

[0067] The high-pressure cleaning device 10 does not include any user-operated elements on the support device 12, for example, the housing 20, that can electrically connect or disconnect the connection lines 44, 46. Compared to conventional high-pressure cleaning devices, such a "main switch" is not provided on the housing 20 for the user.

[0068] To switch the high-pressure cleaning device 10 into a standby mode ready for operation, the high-pressure cleaning device 10 is equipped with an actuation element 74 on the operating unit 34. The actuation element 74 is electrically operated, for example, pressure-sensitive. Operation can be detected, and a related signal can be transmitted from the communication member 68 to the communication member 66.

[0069] In response to this, the operating element 74 is activated, which sends a signal to switch the high-pressure cleaning device 10 off, and in response, the connection line 44 is electrically disconnected.

[0070] To supply power to the actuation element 74, the operating unit 34 has at least one battery 76. The battery 76 is located, for example, in a lockable battery compartment 78 of the operating unit 34 and is replaceable as needed. Alternatively or in addition, the battery 76 can be charged, in particular, inside the operating unit 34.

[0071] The operating element 74 comprises a display unit 80 of the high-pressure cleaning device 10, which in this case is preferably configured as a display unit 82 having a controllable image display.

[0072] The functions of the high-pressure cleaning device 10 will be described later.

[0073] When used as intended, without limiting the invention, it is assumed that the cleaning fluid is pressurized in the pump 16 following the preceding operation and that the connection line 46 is electrically disconnected.

[0074] The user can initially turn on the actuator 74 if necessary.

[0075] By activating the operating element 74, it becomes possible to send a switch-on signal to the control unit 62 via the communication members 66 and 68. In response to this signal, the control unit 62 electrically connects the connection line 44 via the switching element 60. As a result, the high-pressure cleaning device 10 enters an operating mode in which current can be supplied to the electric motor 14.

[0076] In operating mode, the high-pressure washer 10 is initially ready to operate, but the electric motor 14 is not yet started. Only after the manual trigger 40 used to operate the operating unit 34 is activated, the resulting pressure drop causes the pressure switch 70 to conduct electricity through the switching element 72 to the connection line 46. The electric motor 14 is then supplied with electrical energy to drive the pump 16. The user can then spray the pressurized cleaning fluid.

[0077] If the manual trigger 40 is no longer activated and the operating unit 34 is locked, the resulting pressure rise will cause the pressure switch 70 to respond, electrically disconnecting the connection line 46 via the switching element 72. However, the high-pressure washer 10 remains ready to operate so that the electric motor 14 restarts when the manual trigger 40 is activated again.

[0078] When the pump 16 is initially depressurized during startup, the connecting line 46 is initially conductive. When the connecting line 44 becomes conductive in response to the operation of the actuating element 74, current flows through the connecting line 44 to the electric motor 14, resulting in the electric motor starting briefly. As long as the manual trigger 40 is locked, pressure builds up in the pump 16, which in turn shuts off the connecting line 46 via the pressure switch 70. The electric motor 14 starts again when the manual trigger 40 is released.

[0079] During operation of the high-pressure cleaning device 10, the current (power supply current) flowing through the connection line 44 is monitored, for example, by the control unit 62 via the connection part 64. If there is no current flow, this can be indicated to the user on the display unit 82. For example, the control unit 62 assumes that no current is flowing despite the connection line 44 being electrically connected, so the indication includes a fault message. The indication may include, for example, suggestions for correcting the fault.

[0080] During operation, the control unit 62 preferably periodically transmits a test signal to the communication member 66 via the communication member 68. After receiving the test signal, an acknowledgment signal is returned. If no acknowledgment signal is received, the control unit 62 assumes that the wireless connection 69 with the operating unit 34 is being interfered with or interrupted.

[0081] After a predetermined number of unanswered test signals and / or after a predetermined time has elapsed, the control unit 62 may, for safety reasons, electrically disconnect the connection line 44 via the switching element 60. For example, disconnection may occur after approximately 2 to 30 seconds.

[0082] In relation to this patent application, "predetermined" can also include "can be determined in advance."

[0083] The control unit 62 can electrically disconnect the connection line 44 even when not in operation. This occurs, for example, when the manual trigger 40 is not activated for a predetermined period of time. In practice, for example, it may be beneficial to have a shutdown of about 10 to 30 minutes before the connection line 44 is disconnected.

[0084] The disconnection of the connection line 44 also provides the advantage that the electric motor 14 will not restart if a leak occurs in the high-pressure conduit 30 and / or the operating unit 34 and the associated pressure drop occurs. This protects the electric motor 14 and the pump 16.

[0085] The control line 84 is shown in Figure 2. The control unit 62 is electrically connected to the valve section of the pump 16 via the control line 84. The valve unit is connected to the return line from the pressure chamber to the inlet chamber of the pump 16, and its free cross-sectional area can be changed via the valve unit.

[0086] Preferably, the free cross-sectional area of ​​the return line can be changed via the actuation element 74, and in particular the pump pressure can be adjusted, without requiring a separate adjustment element in the operating unit 34. The return line and valve unit and their control can be configured, for example, as described in the international application of the same applicant published under WO 2016 / 102074 A1. [Explanation of symbols]

[0087] 10… High-pressure cleaning equipment 12...Support device 14… Electric motor 16... Pump 18… Electrical devices 20… Housing 22… Acceptance space 24... Pump Inlet 26…Supply conduit 28... Pump outlet 30…High-voltage conduit 32... Hose line 34…Operation Unit 36... High-pressure gun 38…Release element 40…Manual trigger 42... Spray lance 44…Connection line 46…Connection line 48…Connection cable 50...plug 52…Power supply devices 54… Battery 56…Receptacle 58… Relay 60… Switching element 62…Control Unit 64...Connection part 66, 68… Communication components 69…Wireless connection 70... Pressure switch 72… Switching element 74…Actuating elements 76…Battery 78... Battery room 80…Display Unit 82…Display Unit 84... Control line

Claims

1. The system comprises a support device (12), an electric motor (14) held on and / or positioned on the support device (12), a pump (16) drivable by the electric motor (14), an electrical device (18), and a user-guided operation unit (34) connected to or connectable to the pump (16) via a high-voltage conduit (30). The electrical device (18) is equipped with two connection lines (44, 46), and the electric motor (14) is connected to or can be connected to the power supply device (52) in a bipolar manner via these connection lines (44, 46), and can supply electrical energy to the electric motor (14). The electrical device (18) comprises at least one switching element (60) connected by at least one connection line (44, 46), a control unit (62), and a first communication member (66), The operating unit (34) comprises an operating element (74) and a second communication member (68) for wirelessly transmitting a signal to the first communication member (66). The control unit (62) is operably connected to the at least one switching element (60), and the at least one connection line (44, 46) is electrically connected or electrically disconnected in response to the operation of the actuation element (74). In an electric high-pressure cleaning device, When the at least one connection line (44, 46) is electrically connected, a test signal can be transmitted from the control unit (62) to the second communication member (68) via the first communication member (66), and a confirmation signal in response to the test signal can be transmitted from the second communication member (68) to the first communication member (66), and if the confirmation signal is not present, the at least one connection line (44, 46) is electrically disconnected. An electric high-pressure washer characterized by the following.

2. The high-pressure cleaning device (10) is switched to standby mode when the connection lines (44, 46) are electrically connected, and the electric motor (14) is switched on only when the user activates the release element (38) on the operating unit (34) to spray cleaning fluid, as described in claim 1.

3. The high-pressure cleaning apparatus according to claim 1 or 2, characterized by a permanent wireless connection between the communication members (66, 68) from the time the at least one connection line (44, 46) is electrically connected for the first time by operating the actuation element (74) until the at least one connection line (44, 46) is electrically disconnected by operating the actuation element (74).

4. The high-pressure cleaning apparatus according to any one of claims 1 to 3, characterized in that the electrical device (18) does not include any further switching elements (60) connected by at least one connection line (44, 46).

5. The high-pressure cleaning device (10) is characterized in that there is no operating element on the support device (12) for the user to electrically connect the at least one connection line (44, 46), and / or apart from the operating element (74), the high-pressure cleaning device (10) is not provided with any further operating elements for switching the high-pressure cleaning device (10) on and / or off.

6. The high-pressure cleaning apparatus according to any one of claims 1 to 5, characterized in that the control unit (62) is galvanically isolated from the at least one connection line (44, 46) via the switching element (60).

7. The high-pressure cleaning device according to any one of claims 1 to 6, characterized in that the signal transmitted from the second communication member (68) to the first communication member (66) is a pulse signal.

8. During the operation of the high-pressure cleaning device (10), - The conductive connection lines (44, 46) are monitorable by the control unit (62) for the flow of current to the electric motor (14) and / or the voltage drop across the ends of the electric motor (14), and the display unit (80) of the high-pressure cleaning device (10) indicates that there is no current flow and / or voltage drop. - The high-pressure cleaning device (10) can monitor for pressure drops in the cleaning fluid, and when a pressure drop occurs, the display unit (80) of the high-pressure cleaning device (10) can display the pressure drop to the user. A high-pressure cleaning device according to any one of claims 1 to 7, characterized in that at least one of the following is applied.

9. The high-pressure cleaning apparatus according to claim 8, characterized in that the operating unit (34) includes or forms the display unit (80), and can transmit a corresponding display signal from the first communication member (66) to the second communication member (68).

10. The high-pressure cleaning device according to any one of claims 1 to 9, characterized in that the test signal is retransmittable, and the connection lines (44, 46) are disconnected only after a predetermined number of confirmation signals have been absent or after a predetermined period of time has elapsed.

11. The high-pressure cleaning device according to any one of claims 1 to 10, characterized in that the operating unit (34) comprises at least one battery (76) for supplying power to the operating element (74).

12. The high-pressure cleaning device according to claim 11, characterized in that the charge level of the at least one battery (76) can be displayed on the display unit (80) of the operation unit (34), and / or a display can be given when the at least one battery (76) falls below a predetermined charge level.

13. The high-pressure cleaning device according to claim 11 or 12, characterized in that when the operating element (74) is activated, if the charge level of at least one battery (76) falls below a predetermined level, a signal is not transmitted from the second communication member (68) to the first communication member (66).

14. The high-pressure cleaning device according to any one of claims 1 to 13, wherein the operating unit (34) comprises a release element (38), and the operating unit (34) is operable via the release element (38) to spray the cleaning fluid, and the release element (38) is different from the operating element (74).

15. The control unit (62) is - After a predetermined period has elapsed in which the release element (38) has not been activated, - After a predetermined period has elapsed in which no current flow has been detected through at least one of the connection lines (44, 46), A high-pressure cleaning device according to any one of claims 1 to 14, characterized in that when at least one of the conditions is met, the at least one connection line (44, 46) is electrically disconnected via the at least one switching element (60).

16. The high-pressure cleaning device according to any one of claims 1 to 15, wherein the high-pressure cleaning device (10) comprises a pressure switch (70) capable of detecting the pressure inside the pump (16) or downstream of the pump (16), and the pressure switch (70) comprises a further switching element (72) connected to one of the connection lines (44, 46) or is operably connected to the further switching element (72), the further switching element (72) conductively connects the connection lines (44, 46) when the pressure falls below a threshold pressure, and disconnects the connection lines when the pressure reaches and / or exceeds the threshold pressure.

17. The high-pressure cleaning device according to claim 16, characterized in that the further switching element (72) is connected by a different connection line (46) than the switching element (60) which is operated in response to the operation of the operating element (74).

18. The high-pressure cleaning device (10) is characterized in that it has a connecting cable (48) which is wired and includes the connecting lines (44, 46), and / or the high-pressure cleaning device (10) is battery-operated and has a receptacle (56) for an electric battery (54) which can be coupled to the connecting lines (44, 46), according to any one of claims 1 to 17.

19. The high-pressure cleaning device according to any one of claims 1 to 18, characterized in that the support device (12) comprises a housing (20) of the high-pressure cleaning device (10), and the electric motor (14), the pump (16), and at least partially the electric device (18) are housed within the housing (20).

20. The high-pressure cleaning device (10) is characterized in that, as a component of the electrical device (18), there is no operating element on the support device (12) for the user to electrically connect the at least one connection line (44, 46), the high-pressure cleaning device according to any one of claims 1 to 19.

21. During the operation of the high-pressure cleaning device (10), - The conductive connection lines (44, 46) are monitorable by the control unit (62) for the flow of current to the electric motor (14) and / or the voltage drop across the ends of the electric motor (14), and the display unit (82) of the high-pressure cleaning device (10) indicates that there is no current flow and / or voltage drop. - The high-pressure cleaning device (10) can monitor for pressure drops in the cleaning fluid, and when a pressure drop occurs, the display unit (82) of the high-pressure cleaning device (10) can display the pressure drop to the user. A high-pressure cleaning device according to any one of claims 1 to 20, characterized in that at least one of the following is applied.

22. The high-pressure cleaning device according to any one of claims 1 to 21, characterized in that the test signal is periodically transmittable, and the connection lines (44, 46) are interrupted only after a predetermined number of confirmation signals have been absent or after a predetermined period of time has elapsed.

23. The high-pressure cleaning device according to claim 11, characterized in that the charge level of at least one battery (76) can be displayed on the display unit (82) of the operation unit (34).

24. The high-pressure cleaning device according to claim 14, characterized in that the release element (38) is a manual trigger (40).

Images