Scroll compressor and heat pump device

A scroll compressor, the scroll compressor (96) comprising:

• a movable scroll (35);
• a static scroll (1), the static scroll (1) having a base plate (10) and a scroll wall (11) disposed on the base plate (10);
• and
• a housing (2) arranged on a side of the base plate (10) facing away from the scroll wall (11);
• wherein,
• the housing (2) has a first cavity (22), the first cavity (22) having a first opening (220) on a bottom surface (24) of the housing (2) facing the base plate (10), the first opening (220) being covered by the base plate (10) to form a gas-injection chamber (30), the gas-injection chamber (30) being connected via a gas-injection hole (13) on the base plate (10) to a compression chamber (33) corresponding to an intermediate pressure stage formed by the movable scroll (35) and the static scroll (1), the first cavity (22) being connected to a gas-injection port (26) of the scroll compressor (96), and a non-return valve device (7) for one-way flow from the gas-injection port (26) to the gas-injection chamber (30) being provided in the first cavity (22).