Hydraulic machine, in particular hydraulic pressure exchanger

Abstract

A hydraulic machine, in particular hydraulic pressure exchanger, is provided comprising a drum rotatable about a rotational axis, 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 ( 8 ), said first front plate comprising at least a high pressure supply port. Such a pressure exchanger should have a simple construction. To this end the pressure shoe ( 8 ) comprises at least a pressure cylinder ( 14 ), said pressure cylinder ( 14 ) opening to said first front plate, a piston ( 17 ) being arranged in said pressure cylinder ( 14 ), said pressure cylinder ( 14 ) being in fluid contact with said high pressure supply port.

What is claimed is: 
     
         1 . A hydraulic machine, in particular hydraulic pressure exchanger comprising a drum rotatable about a rotational axis, 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 working 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 the pressure shoe comprises at least a pressure cylinder, said pressure cylinder opening to said first front plate, a piston being arranged in said pressure cylinder, said pressure cylinder being in fluid contact with said port. 
     
     
         2 . The hydraulic machine according to  claim 1 , wherein said pressure cylinder is arranged in an area which is closer to said rotational axis than to a circumference of said drum. 
     
     
         3 . The hydraulic machine according to  claim 1 , wherein at least two pressure cylinders are arranged in said pressure shoe. 
     
     
         4 . The hydraulic machine according to  claim 3 , wherein said pressure cylinders have the same cross section area. 
     
     
         5 . The hydraulic machine according to  claim 1 , wherein said pressure shoe comprises two ports on a side facing said first front plate, said ports having a minimum distance along a straight line, said pressure cylinder being offset to said straight line by a predetermined displacement. 
     
     
         6 . The hydraulic machine according to  claim 5 , wherein said pressure cylinder is arranged between said ports. 
     
     
         7 . The hydraulic machine according to  claim 1 , wherein said pressure shoe 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. 
     
     
         8 . The hydraulic machine according to  claim 7 , wherein said outer pressure area is arranged within said channel. 
     
     
         9 . The hydraulic machine 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. 
     
     
         10 . The hydraulic machine according to  claim 2 , at least two pressure cylinders are arranged in said pressure shoe. 
     
     
         11 . The hydraulic machine according to  claim 2 , wherein said pressure shoe comprises two ports on a side facing said first front plate, said ports having a minimum distance along a straight line, said pressure cylinder being offset to said straight line by a predetermined displacement. 
     
     
         12 . The hydraulic machine according to  claim 3 , wherein said pressure shoe comprises two ports on a side facing said first front plate, said ports having a minimum distance along a straight line, said pressure cylinder being offset to said straight line by a predetermined displacement. 
     
     
         13 . The hydraulic machine according to  claim 4 , wherein said pressure shoe comprises two ports on a side facing said first front plate, said ports having a minimum distance along a straight line, said pressure cylinder being offset to said straight line by a predetermined displacement. 
     
     
         14 . The hydraulic machine according to  claim 2 , wherein said pressure shoe 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. 
     
     
         15 . The hydraulic machine according to  claim 3 , wherein said pressure shoe 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. 
     
     
         16 . The hydraulic machine according to  claim 4 , wherein said pressure shoe 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. 
     
     
         17 . The hydraulic machine according to  claim 5 , wherein said pressure shoe 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. 
     
     
         18 . The hydraulic machine according to  claim 6 , wherein said pressure shoe 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. 
     
     
         19 . The hydraulic machine according to  claim 2 , 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. 
     
     
         20 . The hydraulic machine according to  claim 3 , 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.