Fuel delivery device for cryogenic fuels and method for operating a fuel delivery device

摘要

Fuel delivery device (100) for cryogenic fuels with a tank (30), a high-pressure delivery pump (1) and an inlet line (18) through which the high-pressure delivery pump (1) can be connected to the tank (30). The high-pressure feed pump (1) has a pump housing (2) which has a step-shaped longitudinal bore (17) in which a pump piston (4) is arranged to be longitudinally movable. The longitudinal bore (17) comprises a high-pressure chamber (12) bounded by one end (46) of the pump piston (4), a low-pressure region (26) formed between the longitudinal bore (17) and the pump piston (4) and one with the inlet line (18) connected suction chamber (48). The low pressure region (26) is also connected to a return line (22) formed in the pump housing (2). In addition, the return line (22) has a first line section (222) and a second line section (221), the first line section (222) being connected to the suction space (48) by means of a check valve (20) arranged in the first line section (222). is connectable and a switching valve (70) is arranged in the second line section (221), through which switching valve (70) the second line section (221) can be connected to the tank (30).