Heat exchanger with a separator

A heat exchanger comprising:

• a tubular housing formed from a first housing part and a second housing part each being pot-shaped and having a housing portion, an outwardly widened flange ring portion, and a base, the first and second housing parts being connected to one another via the flange ring portions, wherein the flange ring portions delimit an annular space;
• an inlet connecting-piece and an outlet connecting-piece for coolant on the first housing part;
• a flange ring formed from the flange ring portions;
• heat exchanger tubes, which run through the housing and are respectively held at a longitudinal end side in the base of each housing part, wherein in the heat exchanger tubes, a first flow channel is formed, and a second flow channel is formed between the heat exchanger tubes and the housing;
• and
• at least one separator arranged between the housing and the heat exchanger tubes, at least two blades being provided on the at least one separator, each blade having an opening adjacent thereto, each blade engaging at least partly into the annular space and at least reducing a circumferential flow therein;
• wherein an external geometry of the at least two blades is configured in a complementary manner to an internal geometry of the annular space;
• wherein the least two blades have identical radial heights or differing radial heights;
• and
• wherein an external geometry of the at least one blade is configured in a complementary manner to an internal geometry of the annular space, the annular space extending between an outer peripheral edge of the flange ring portions and an outer surface of the separator.