Process for controlling a high-pressure cleaner and high-pressure cleaner for implementing said process
AssigneeAlfred Kärcher GmbH & Co. KG
InventorWerner Schulze
Life of this patent
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Abstract
In a high-pressure cleaner, in order to control additional equipment, such as chemical doser or burner, from a hand spray gun without any special control lines, it is proposed to connect a second closable flow path in parallel with the normal flow path through the spray nozzle, to determine the pressure rise time in the cleaning fluid after the switching on of the high-pressure pump and to generate a control signal by opening the second flow path to extend said rise time compared with the rise time when the second flow path is closed; furthermore, a high-pressure cleaner is proposed for implementing this process.
Claims14
Process for controlling a high-pressure cleaner which discharges cleaning fluid through a spray nozzle, said cleaning fluid being delivered by a high-pressure pump through a high-pressure line provided with a closing valve, in which the high-pressure pump is switched on and off as a function of the pressure in the high-pressure line, whereby the pump is switched on when the pressure in the high-pressure line has fallen below the switch-on pressure, said switch-on pressure being below the operating pressure resulting when the high-pressure pump is in operation and the closing valve is wholly or partially open,
- wherein to generate a control signal, a second, closable flow path is connected in parallel with the flow path through the spray nozzle, whereby, after the switching on of the pump, the pressure rise time in the cleaning fluid between a lower limit value P.sub.u and an upper limit value P.sub.o is determined and a control signal is generated by opening the second flow path to extend said rise time in comparison with the rise time with the second flow path closed.
High pressure cleaner with a high pressure pump, a high-pressure line with closing valve leading from said high pressure pump to a nozzle pipe, and with a pressure sensor disposed upstream of the closing valve and generating a signal which switches on the high-pressure pump when the pressure drops below the switch-on pressure, wherein a second, closable flow path (outlet line 27;
- outlet line 34) leading from the high pressure line (2) to an outlet (27) and serving to change the pressure rise time is provided parallel with a first flow path leading from the high pressure line (2) to the nozle pipe (7), whereby connected to the high-pressure line (2) is a pressure-sensitive signal generator (48) which is connected to a timer (50), said timer (50) generating a control signal to cause the operation of auxiliary equipment when the rist time (t) between two specific pressure values (lower limit value p.sub.w ;
- upper limit value p.sub.o) exceeds a certain value when the high-pressure pump (36) switches on.
Dependencies are inferred from the claim text.