Device for energy conversion

A device for the isothermal expansion and compression of a gas, ensuring the compression of said gas by consuming mechanical energy and the restitution of mechanical energy by the expansion of said gas, said device comprising:

• at least one first and at least one second liquid piston, movable respectively in a first and a second chamber, each of said at least one first and second chambers comprising a gas, able to be compressed or expanded under the effect of the movement of said at least one first or second liquid piston;
• an actuator capable of moving said at least one first and second liquid pistons in said first and second chambers;
• each of said at least one first and second chambers comprising respectively at least one first and at least one second apertured insert through which said liquid and said gas can flow;
• said actuator is a mechanical actuator comprising at least one solid piston;
• said apertured insert comprises through-cells, which extend between a first cell opening opening out at one end of said insert and a second cell opening opening out at a second end of said insert, said cells being oriented in a direction which is either parallel to the direction of movement of said liquid piston in said insert or inclined with respect to the direction of movement of said liquid piston;
• and said device further comprises at least a first phase separator connected to a first outlet of said first chamber and to a second outlet of said second chamber.