Patent ID: 8621878

Claim:
An injection device intended to be fixed to a wall of a bottom part of a container containing a product to be cooled in bulk, said injection device comprising: a bottom element, which, in an operating position, is furthest from a wall of a container containing a product to be cooled in bulk, and which is connectable to a cryogenic fluid feed system, said bottom element comprising: a feed channel having first and second ends, said first end of said feed channel being connectable to a cryogenic fluid feed system, and a blind central recess; a central element whose lower end bears on the bottom element, said central element comprising an axially extending through hole and first and second through channels each one of which having first and second ends, each of said first ends of said through channels being beveled, said second end of said feed channel being connected to said second ends of said through channel; a valve comprising a loading spring tightly biasing a valve seat against said first ends of said through channel, said valve being disposed slidingly in said axially extending through hole, said axially extending through hole of said central element having a larger diameter at a lower end thereof and a smaller diameter at an upper end thereof so that a first end of said loading spring is maintained against a shoulder formed on a bottom face of said upper end of said axially extending through hole, said blind central recess being adapted to accommodate a second end of the loading spring, the second ends of the through channel terminating at the valve seat, said through channels being substantially parallel to the valve axis; a thermal bridge surrounding the central element, a lower end of said thermal bridge bearing against the bottom element; and a wall element having a lower end surrounding and bearing against a bottom edge of the thermal bridge and an upper end adapted to be fixed to the chamber wall.