High-pressure cleaning device

The invention relates to a high-pressure cleaner with an electric motor, a shaft driven by this high pressure pump and with an automatic shut-off for the electric motor, which includes a switch which is switchable from a dependent movable by the pressure or the flow of the liquid pumped by the high-pressure pump actuator.

Such high-pressure pump is described for example in DE 42 21 286 A1. The prior-breaking device comprises a slidably mounted plunger which acts on a microswitch and this is operated so that the power supply is interrupted to the electric motor if certain pressure or flow conditions occur, for example when the liquid discharge is prevented by closing the discharge line, or if the pump not enough fluid is replenished. There are various pressure or flow sensors that monitor the desired operating conditions and which may lead to a circuit of such an emergency cutout. So is described under DE 42 21 286 A1 that a sensor element is provided, which is built directly into the outflow and any excess pressure upstream of the line detects and thereby correspondingly leads to a shutdown. The micro switch used as an emergency cutout is connected with this construction with the main switch of the high-pressure cleaner in succession, for the usual shutdown of the device so an additional main switch is required.

The object of the invention to provide a high-pressure cleaning device of the generic type such that said circuit operations can be performed with less effort.

This object is achieved with a high-pressure cleaner of the type described above according to the invention that the same switch is associated with a disconnecting device, which is manually operable at high pressure cleaning equipment, so that in one position of Ausschaltelementes the switch power to the electric motor regardless of the pressure or the flow of subsidized liquid interrupts while it is switched in the other position of the actuating element.

Thus, the emergency disconnect directly used in new construction as well as the main switch, so that it is no longer necessary to provide separate switches for these functions. This common, both the emergency shutdown and the main shut-off posh end switch is still actuated by the mechanical actuator which is flow-or pressure-dependent moves and can lead to an emergency shutdown when corresponding maximum values ​​are exceeded. In addition, acts on the same switch also a disconnecting device a which can move the same switch in the off position, regardless of the respective position of the actuating element. Thus, the device can always be turned off by this disconnecting device, a special switch is no longer necessary for this.

In principle it would be possible for the disconnecting device acts directly on the actuating element and that moves independently of the pressure and flow values, but is preferably a structure in which both the actuating member and the disconnecting device against a movable switching element of the switch can be moved and in which in this case, the switching element is moved to the off position of the switch. And actuating element disconnecting device are thus parallel switching elements can, alternatively, move the switch to the off position, in normal operation both actuating element and disconnecting device are removed from the switch, that the switch is not turned off. Once the maximum values ​​of pressure or flow of the liquid to be exceeded, the actuating element is moved against the switch and turns off these, the disconnecting device is actuated has the same effect. In the same way on the switch

In a preferred embodiment it can be provided that the off switching element in the off position can be fixed, for example by locking the Ausschaltelementes. This ensures that these deliberately set position is maintained, the device therefore remains off when the disconnecting device is moved to the off position.

In another preferred embodiment it is provided that the off switching element shifts the switch between two positions, and the actuating member reaches the switch in only one these two positions for switching. the switch so it is displaced so far by the disconnecting device, that the actuating element of the switch can not operate on, only when the switch is approximated by the off switching element to the actuator, a switching of the switch by the operating member is possible. If the switch is not actuated, the motor is turned off, only upon actuation of the switch, the engine is running.

It is particularly advantageous if the switch on the high-pressure cleaning device is pivotally mounted and when the disconnecting device pivots the switch between two positions.

It can be provided that the switch is pressed by a spring against the operating member.

It is favorable when the disconnecting device is a rotatable eccentric.

In a further preferred embodiment it is provided that the actuating element is a pivoted lever which rests against a switching projection of the switch and which is pivotable by a displaceable depending on the pressure or the flow of the pumped fluid ram. Thereby, a deflection of the movement of the plunger is possible, for example, can take place transversely to the displacement of the plunger, the displacement of the switching member of the switch.

In a further preferred embodiment it is provided that the actuating element carries a can be placed against the switching member of the switch button and is depending on the pressure or the flow of the liquid being pumped so displaceable that the button actuates the switching member in one position and not in another, and that the actuating member is additionally displaceable manually in such a way that the button can be placed only in one position of the switching member. The switching element itself is therefore shifted to permanent shutdown in a position in which the the switching element button the switch can not reach, so that even when a displacement of the actuating element can enter a shift is not under the influence of pressure or the flow of the cleaning liquid.

It is particularly advantageous if the actuating element about a rotational axis and depending on the pressure or of the flow of cleaning liquid along the rotational axis is displaceable and if it, on its outer circumferential periphery an only over a limited circumferential angle extending, in the axial direction a different distance from the axis of rotation having button bears.

In an angular position of the actuating element, the button can by axial displacement of the actuating member actuating the switch member of the switch, in a different angular position, however, the button can not be applied to the switching member of the switch, regardless of the respective axial position of the actuating element.

It is advantageous if the axial displacement of the actuating element abuts a function of pressure or flow of the cleaning liquid movable plunger on this is.

In a preferred embodiment, it is provided that the actuating element rotatably and axially connected freely movable with a form of a rotary member disconnecting device.

A particularly preferred embodiment is characterized in that the actuating element is designed as a sleeve, into which a pin of the Ausschaltelements that at the bottom of the sleeve abuts a dependent on pressure or flow of the cleaning liquid displaceable plunger and in that between the disconnecting device and the sleeve these pressing against the plunger spring is arranged. This results in a very compact unit consisting of actuator and disconnecting device.

The following description of preferred embodiments of the invention serves in conjunction with the drawings for further explanation. Show it:<dl id="dl0001"><dt>Figure 1:</dt><dd>is a schematic longitudinal sectional view through a high-pressure cleaning device with an actuatable both by a flow-dependent operating element as well as by a disconnecting device operable from the outside microswitch;</dd><dt>Figure 2:</dt><dd>an enlarged detail view of the micro switch, the actuating element and the Ausschaltelementes in normal operation of the high-pressure cleaner;</dd><dt>Figure 3:</dt><dd>a view similar to Figure 2 with the disconnecting device in open position;</dd><dt>Figure 4:</dt><dd>a schematic cross-sectional view of a high-pressure cleaning device with a switch which can be actuated by an actuator and swiveled from a disconnecting device;</dd><dt>Figure 5:</dt><dd>a partial view of the high-pressure cleaning device of figure 4 in the area of ​​the switch and it operated plunger in the non-actuated switch;</dd><dt>Figure 6:</dt><dd>a sectional view taken along lines 6-6 of Figure 4 with the switch in switch position (solid lines) and in off position (dotted lines);</dd><dt>Figure 7:</dt><dd>a longitudinal sectional view of a combined actuating and Ausschaltelements for the switch of a high pressure cleaning device in another preferred embodiment of the switch is on;</dd><dt>Figure 8:</dt><dd>a view similar to Figure 7 with the non-actuated switch and</dd><dt>Figure 9:</dt><dd>a view similar to Figure 7 with off actuator.</dd></dl>

1 shows a high-pressure cleaning device is shown, which essentially comprises an electric motor 1, a driven of this swash plate drive 2 and driven by the swash plate drive 2 axial piston pump. 3 The piston 4 of the axial piston 3 are pressed by springs to the swash plate drive 2 and moved by these reciprocal travel in pumping chambers. 5

By exiting from the axial piston pump 3 pressure line 6 3 sucked cleaning liquid is of the axial piston pump and offload via a terminal 7, the case for example a high-pressure hose with a high pressure lance can be connected, these parts are not shown in the drawing.

In a separate control chamber 8 of the axial piston pump, a piston 9 is sealed and slidably mounted, which is acted upon by a control arranged in the chamber 8 spring 10th

The piston 9 separates the control chamber 8 into two chambers, namely a first chamber 11 which communicates with an injector-type constriction 13 the pressure pipe 6 connected via a control line 12, and into a chamber 14, the upstream in the drawing does not clearly ersichtbarer way the constriction 13 is connected to the pressure pipe 6 in compound. This rule in the chambers 11 and 14, the pressures which are established respectively in the region of the constriction 13 and in the upstream pressure line. 6

The piston 9 is provided with a sealed lead-out from the control chamber 8 plunger 15 which faces the reed 16 of a microswitch 17; this microswitch 17 is attached to the axial piston pump 3 appropriately, in the drawing a manner not shown.

In operation results in the area of ​​the constriction 13, a dynamic pressure reduction when the constriction is in flow flowing through. With open pressure line and at a promotion of cleaning liquid therefore builds on the piston 9 to a pressure differential which draws the plunger 15 into the control chamber 8, thus removing it from the switch tongue 16 of the microswitch 17th The microswitch 17 remains unactuated in this position, and can connect the electric motor 1 with a voltage source, not shown in the drawing, so that the electric motor is operating normally.

Once the flow is interrupted in the pressure line, for example by closing the discharge conduit, provide substantially equal pressures in the chambers 11 and 14, and this causes the piston to move 9 and with it the plunger 15 against the microswitch 17 , The plunger 15 thereby activating the switch tongue 16 of the microswitch 17, and this then interrupts the power supply to the electric motor 1, that is, as a result, the electric motor 1 is turned off. This off state continues until again a pressure difference in the chambers is constructed 11 and 14, this can be achieved for example by opening the discharge line.

In addition to the tappet 15 a rotatable disconnecting device 18 is mounted on the axial piston pump 3, which is rotatable from the exterior side of the high-pressure cleaning appliance forth. For this purpose, this off switching element 18 may be provided with a switching shaft which is guided out of a housing 19 of the high-pressure cleaning appliance to the outside, this is not shown in the drawing. The disconnecting device 18 carries a lateral projection 20, which is removed at a first angular position of the Ausschaltelementes 18 from the switching blade 16 of the micro switch 17 (Figure 2) in a different angular position, however, rests against the switch tongue 16 and thereby the microswitch 17 is operated (Figure 3) , that is the microswitch 17, thus interrupting the power supply to the electric motor. 1

The disconnecting device 18 is disposed adjacent to the plunger 15 such that both the disconnecting device 18 and the plunger 17 can move 15 the same switching blade 16 in the open position of the microswitch. When the disconnecting device 18 the microswitch 17 shifts to the disconnected position, the disconnecting device is fixed 18 in this open position, this can be done for example by a resilient catch, is effected by the rastered the rotational movement of Ausschaltelementes 18th This notch is not shown in the drawing.

During operation of the high-pressure cleaner, the operator first turns the off switching element 18 from the open position (Figure 3) in the operating position (Figure 2). Thus, the device is turned on, the electric motor 1, however, begin to run until a pressure difference in the chambers is constructed 11 and 14, so even if the plunger 15 is moved to the retracted position.

In operation, the micro switch 17 is connected exclusively by the ram 15, as the disconnecting device 18 acts as a switch and remains switched on. However, if the user wants to end the operation to shut down the unit, he can achieve this through the disconnecting device 18 in a simple manner, it is then sufficient to twist the disconnecting device 18 in the off position.

Overall, a single micro-switch is provided both as a master switch or as an emergency cutout in this way, it is therefore no longer necessary, two such switches to switch in succession. Just for completeness it should be noted that the plunger 15 can be moved in a different way to an emergency stop. In the illustrated embodiment, the circuit of the plunger is effected by a pressure difference in the pressure line, in principle, it would also be possible to provide other switching sizes for the actuation of the ram 15, for example, the plunger could be moved depending on the temperature, to allow cut-off at a too strong heating of the liquid , other possibilities are also conceivable. The only factor is that in addition to the operation-dependent displacement of the plunger or other actuator of the microswitch 17 additional manual deactivation function for the same switch is provided.

In the embodiment of Figures 1 through 3, both the actuating member and the disconnecting device to a common switch tongue 16 of the switch act. In the embodiment of Figures 4 to 6 another option is specified, as can be achieved by the actuator depending on pressure or flow of the cleaning liquid on only when a certain position of Ausschaltelements of the switch, whereas in another position of Ausschaltelements not.

The high-pressure cleaning device itself can be constructed the same as in the embodiment of Figures 1 to 3, corresponding parts therefore bear the same reference numerals.

In contrast to the embodiment of Figures 1 to 3 is mounted rotatably about an axis of rotation 21 at the high-pressure cleaning device in the embodiment of Figures 4 to 6 of the micro-switch 17th A V-shaped bending spring 22 is located on an arm 23 of the microswitch 17 and the other arm 24 on the high-pressure cleaning device itself and pivots the microswitch 17 characterized against a stop, not shown in the drawing. In this position, shown in Figure 6 by solid lines, the switch is in its operating position.

The high-pressure cleaning appliance, a pivot lever 25 is pivotably mounted, whose one arm 26 resiliently depressible into the micro switch 17 switching member facing 27 and at the other arm 28 a rod 15 is present, the in in the same manner as the plunger 15 in the embodiment of Figures 1 to 3 depending on pressure and / or flow of the fluid to be displaced, but in the exemplary embodiment illustrated here in the reverse direction, that is in contrast to the embodiment of figures 1 to 3 is performed in this embodiment, a disconnection of the engine when the plunger in the high-pressure cleaning appliance is drawn, so remote from the pivot lever 25th If the plunger 15 but pushed forward, he pivots the pivot lever 25 and presses with its arm 26 against the switch member 27, while making sure to wear that the spiral spring 22 is so strong that they thereby preventing an evasion of the microswitch 17th

On high-pressure cleaning device, an eccentric 30 is by means of a rotary handle 29 is rotatably mounted, which is located in a position from the microswitch 17, the opposition to the action in the second position, which is shown in broken lines in Figure 6, however, comes at the micro switch 17 for conditioning and this bending spring 22 pivoted so far that the pivoting lever 25 in any position which it assumes through the displacement of the plunger 15, the switching member 27 can no longer reach. Therefore, the switching element 27 remains in this pivoted position of the micro switch 17 in each case unconfirmed, and this results in that the engine remains switched off permanently.

The twist grip 29 thus forms, together with the eccentric 30, a disconnecting device with which the engine can be permanently off, while in the operating condition a switch-off of the motor in function of the pressure or of the flow of the liquid via the plunger 15 and the pivot lever can be effected 25th Here occur the activation and deactivation of the motor function of the pressure or of the flow of the liquid on the one hand and the switching on and off of the motor at the beginning and end of the operational phase through a single microswitch 17th

The same objective is also in the embodiment of FIGS 7 to 9 achieved, but with other constructional means. Even here, the construction of high-pressure cleaning device is substantially the same as in the previous embodiments, and it is for starting and stopping of the engine is also a microswitch 17 used corresponding parts therefore bear also here the same reference numerals.

The microswitch 17 is kept here laid on high-pressure cleaner, immediately next to the microswitch 17 a sleeve-shaped actuator is mounted transversely to the direction 31 of the switching element 27 of the microswitch 17 axially movable on high-pressure cleaner. For this, the sleeve-shaped actuator 31 is surrounded on its upper side and on its underside each of a cylindrical guide 32 and 33, the 31 store next to the limited axial displacement of the actuating element of this also to its longitudinal axis. In the sleeve-shaped actuating element 31 extends into a pin 34 a arranged on the high-pressure cleaner turning handle 35, these together with the pin 34, the disconnecting device of this arrangement. The pin 34 is connected to the sleeve-shaped actuating element 31 is axially freely displaceable and rotationally fixed manner, so that rotation of the rotary handle 35 and the sleeve-shaped actuating element 31 is rotated about its axis of rotation.

Between the end face 36 of the pin 34 and the bottom 37 of the sleeve-shaped actuating element 31 is a compression spring 38 is arranged, which presses the sleeve-shaped actuating element 31 against a plunger 15, which abuts the underside of the bottom 37 and in towards the axis of rotation of the actuating element 31 depending on the pressure or of the flow of the pumped fluid is displaced.

The sleeve-shaped actuating element 31 carries on its periphery a cam 39, which extends in circumferential direction only over a small angular range and also in the axial direction has a limited extension. The axis of rotation of the farthest area of ​​the switching cam 39 forms a button 40, which merges via an oblique slide-on surface 41 in the circumferential surface of the sleeve-shaped actuator 31st

If the trip cam 39 the switching member 27 of the microswitch 17 is directly opposite, the shift cam 39 can be moved by axial displacement of the actuating element 31 in a position in which the button 40 abuts the switching element 27, and this in the microswitch 17 presses (7) , and in a position in which the shift cam 39 is adjacent to the switching member 27 and thus this is not operated (figure 8). This displacement between the closed position and the open position takes place against the action of compression spring 38 through the plunger 15 which moves in dependence on the pressure or of the flow of the liquid. It is thus possible, the engine depending on the pressure or of the flow of the liquid inclusion as off.

This switching of the microswitch 17 is possible only when the shift cam 39 faces toward the micro-switch 17th By rotating the rotary handle 35, the actuator 31 may be moved in an angular position in which the shift cam 39 from the microswitch 17 (Figure 9), and in this

Position of the operating member 31, the button 40 of the switching cam 39 in any case, the switching member press 27 of the micro switch 17, irrespective of the particular axial position of the sleeve-shaped actuating element 31, thus the operating member 31 is ensured in this angular position, that the microswitch 17 is not can be connected, it is here to the off the device.