Hydraulic machine, in particular hydraulic pressure exchanger

Abstract

A hydraulic machine ( 1 ) comprising a drum ( 2 ) rotatable around a rotational axis ( 3 ), a motor connection for driving said drum ( 2 ), a first front plate arrangement ( 5 ) at a first front face of said drum ( 2 ), a second front plate arrangement ( 5 ) at a second front face of said drum ( 2 ), said drum ( 2 ) comprising a plurality of cylinders ( 4 ), said first front plate arrangement ( 5 ) comprising a first front plate ( 7 ), a pressure shoe ( 8 ), and first sealing means ( 9 ), said first front plate ( 7 ) comprising at least a high pressure supply port ( 10 ). To this end, said pressure shoe ( 8 ) comprises at least a high pressure channel ( 17 ) connected to said high pressure supply port ( 10 ) and an outer pressure area ( 18 ) loaded by a pressure in said high pressure supply port ( 10 ) in a direction towards said drum ( 2 ), said outer pressure area ( 18 ) being larger than an inner pressure area ( 19 ) on a side of said pressure shoe ( 8 ) facing said drum ( 2 ).

What is claimed is: 
     
         1 . A hydraulic machine comprising a drum rotatable around a rotational axis, a motor connection for driving said drum, a first front plate arrangement at a first front face of said drum, a second front plate arrangement at a second front face of said drum, said drum comprising a plurality of cylinders, said first front plate arrangement comprising a first front plate and a pressure shoe, said first front plate comprising at least a port, wherein said pressure shoe is movable relative to the drum in a direction of said rotational axis and comprises at least a high pressure channel connected to said port and an outer pressure area loaded by a pressure in said port in a direction towards said drum, said outer pressure area being larger than an inner pressure area on a side of said pressure shoe facing said drum. 
     
     
         2 . The pressure exchanger according to  claim 1 , wherein said pressure shoe is held unrotatable. 
     
     
         3 . The pressure exchanger according to  claim 1 , wherein said outer pressure area is arranged within said channel. 
     
     
         4 . The pressure exchanger according to  claim 3 , wherein said channel comprises a section area decreasing in a direction towards said drum. 
     
     
         5 . The pressure exchanger according to  claim 4 , wherein said high pressure channel comprises a circle-shaped inlet on a side facing said first front plate and a kidney-shaped outlet on a side facing said drum. 
     
     
         6 . The pressure exchanger according to  claim 1 , wherein a sleeve is inserted in said high pressure channel in said pressure shoe and in said high pressure supply port in said first front plate. 
     
     
         7 . The pressure exchanger according to  claim 6 , wherein said sleeve is fixed in said pressure shoe and movable and sealed in said first front plate. 
     
     
         8 . The pressure exchanger according to  claim 1 , wherein said first front plate comprises two ports the centers of which are arranged on a first straight line and said second front plate arrangement comprises a second front plate with two ports the centers of which are arranged on a second straight line, said first straight line and said second straight line being angularly offset to each other. 
     
     
         9 . The pressure exchanger according to  claim 8 , wherein at least one of said front plates comprises a connecting geometry having at least a first mounting surface in which one of the ports is arranged, said first mounting surface being arranged under a predetermined angle relative to the rotational axis of said drum, said angle being in the range of 10° to 80°, in particular in the range of 30° to 60° and preferably in the range of 40° to 50°. 
     
     
         10 . The pressure exchanger according to  claim 1 , wherein said pressure shoe rests against said drum in a contact area, two different materials contacting each other in said contact area, one material being steel and the other material being a plastic material sliding with slow friction on steel, in particular a high-resistant thermoplastic plastic material on the basis of polyaryl etherketones, particularly polyetheretherketones (PEEK), polyamides, polyacetals, polyarylethers, polyethylene terephthalates, polyphenylene sulfides, polysulphones, polyether sulphones, polyether imides, polyamide imides, polyacrylates, phenol resins, like novolacquer resins or the like, preferably provided with a filling of glass, graphite, polytetraflourethylene or carbon, the fillings being particularly useful as fibres. 
     
     
         11 . The pressure exchanger according to  claim 2 , wherein said outer pressure area is arranged within said channel. 
     
     
         12 . The pressure exchanger according to  claim 2 , a sleeve is inserted in said high pressure channel in said pressure shoe and in said high pressure supply port in said first front plate. 
     
     
         13 . The pressure exchanger according to  claim 3 , a sleeve is inserted in said high pressure channel in said pressure shoe and in said high pressure supply port in said first front plate. 
     
     
         14 . The pressure exchanger according to  claim 4 , a sleeve is inserted in said high pressure channel in said pressure shoe and in said high pressure supply port in said first front plate. 
     
     
         15 . The pressure exchanger according to  claim 5 , a sleeve is inserted in said high pressure channel in said pressure shoe and in said high pressure supply port in said first front plate. 
     
     
         16 . The pressure exchanger according to  claim 2 , wherein said first front plate comprises two ports the centers of which are arranged on a first straight line and said second front plate arrangement comprises a second front plate with two ports the centers of which are arranged on a second straight line, said first straight line and said second straight line being angularly offset to each other. 
     
     
         17 . The pressure exchanger according to  claim 3 , wherein said first front plate comprises two ports the centers of which are arranged on a first straight line and said second front plate arrangement comprises a second front plate with two ports the centers of which are arranged on a second straight line, said first straight line and said second straight line being angularly offset to each other. 
     
     
         18 . The pressure exchanger according to  claim 4 , wherein said first front plate comprises two ports the centers of which are arranged on a first straight line and said second front plate arrangement comprises a second front plate with two ports the centers of which are arranged on a second straight line, said first straight line and said second straight line being angularly offset to each other. 
     
     
         19 . The pressure exchanger according to  claim 5 , wherein said first front plate comprises two ports the centers of which are arranged on a first straight line and said second front plate arrangement comprises a second front plate with two ports the centers of which are arranged on a second straight line, said first straight line and said second straight line being angularly offset to each other. 
     
     
         20 . The pressure exchanger according to  claim 6 , wherein said first front plate comprises two ports the centers of which are arranged on a first straight line and said second front plate arrangement comprises a second front plate with two ports the centers of which are arranged on a second straight line, said first straight line and said second straight line being angularly offset to each other.