Gas mixer, gas mixing system, gas engine

A gas mixer for mixing together a first gas and a second gas, comprising:

• a gas housing;
• a venturi tube;
• a displacement body for the first gas, the displacement body being arranged in the venturi tube to form a mixing gap;
• an intake tube connected to the venturi tube and providing an intake opening to the venturi tube for the second gas;
• and
• a control element by which an intake cross section of the intake opening can be adjusted to different values, wherein the control element comprises a first and a second control part forming boundaries of the intake cross section, wherein the first control part is formed as a first gas housing part, and the second control part is formed as a second gas housing part, wherein at least one and/or of the intake tube, wherein at least one of the gas housing parts is movable with respect to the other gas housing part, and wherein the movable gas housing part includes an armature of a linear motor.