Piston pump for a high-pressure cleaning appliance

Abstract

A piston pump for a high-pressure cleaning appliance is provided, including a plurality of pump chambers into each of which one piston which is movable back and forth plunges, and which are each in flow connection via a suction valve with a suction inlet and via a pressure valve with a pressure outlet, the pistons each being surrounded by a sealing ring which is supported in the radial direction by a ring wall and in the axial direction by a support ring. In order to develop the piston pump in such a way that it can be manufactured and assembled more cost-effectively, it is proposed that the piston pump includes a one-piece support shield which forms the support rings and surrounds the ring walls in the circumferential direction.

1 . A piston pump for a high-pressure cleaning appliance, said piston pump comprising a plurality of pump chambers into each of which one piston which is movable back and forth plunges, and which are each in flow connection via a suction valve with a suction inlet and via a pressure valve with a pressure outlet, the pistons each being surrounded by a sealing ring which is supported in the radial direction by a ring wall and in the axial direction by a support ring, and said piston pump comprising a one-piece support shield which forms the support rings and surrounds the ring walls in the circumferential direction. 
     
     
         2 . The piston pump in accordance with  claim 1 , wherein the support shield comprises a plurality of support sleeves into each of which a ring wall extends. 
     
     
         3 . The piston pump in accordance with  claim 1 , wherein the piston pump comprises a pump block which includes the pump chambers and is connected to the support shield by substance-to-substance bonding. 
     
     
         4 . The piston pump in accordance with  claim 1 , wherein the pump block is welded to the support shield. 
     
     
         5 . The piston pump in accordance with  claim 2 , wherein the ring walls are each welded to a surrounding support sleeve. 
     
     
         6 . The piston pump in accordance with  claim 1 , wherein the pump block and the support shield are made of a plastic material. 
     
     
         7 . The piston pump in accordance with  claim 1 , wherein the support shield is fitted on a guide shield comprising guide members for guiding the pistons in the axial direction. 
     
     
         8 . The piston pump in accordance with  claim 7 , wherein the support shield comprises support collars which are fitted on the guide shield and surround one piston each in the circumferential direction. 
     
     
         9 . The piston pump in accordance with  claim 8 , wherein the support collars comprise one drainage opening each.