Patent ID: 9133834
Filing Date: 2015-09-15
Classification: F04B

Abstract:
1. A high pressure pump for injecting a first fluid comprising: at least one pumping chamber; at least one suction and force plunger acting in the pumping chamber; a sealing device for supporting and sealingly guiding the plunger in a reciprocating motion, the sealing device comprising a cylindrical sleeve with an internal cylindrical cavity in which the plunger slides, a lubricating circuit for a second fluid, the lubricating circuit comprising an annular chamber formed in the inner cylindrical cavity of the sleeve around the plunger; and a first sealing gasket providing sealing action against the first fluid, the first sealing gasket being mounted in the cylindrical cavity at a wet side end of the sleeve at a position axially interposed between the pumping chamber and the first annular chamber; wherein the pump further comprises a second sealing gasket for guiding the plunger and sealing against the first fluid, the second sealing gasket being mounted in the cylindrical cavity at a position axially interposed between the first sealing gasket and the annular chamber of the lubrication circuit, wherein the second sealing gasket has an annular body from which at least one main annular relief protrudes in a radially inner direction for sliding against the plunger, and a cooling circuit fluid for a third fluid, the cooling circuit comprising a further annular chamber formed in the hollow cylindrical inner cavity of the sleeve around the plunger at a position axially interposed between the first and second gaskets sealing against the first fluid.