Electrical heating device

An electrical heating device comprising:

• a housing, which encloses a circulation chamber through which a medium can flow, and into which heating ribs extend essentially parallel to one another, each of the ribs having a fixed end, a free end, and a U-shaped recess which opens into a uniform connecting chamber, which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, and which accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact therewith,
• wherein successive heating ribs protrude inwards from oppositely situated inner sides of the housing, wherein
• a flow passage of a meander-type flow channel is formed in the housing between the free ends of the successive heating ribs and the adjacent inner wall of the housing, the flow passage being closed off by a covering element on the side oppositely situated to the partition wall, and wherein
• the heating ribs are connected through a ridge to the assigned inner wall of the housing, which is thinner than the heating ribs.

An electrical heating device comprising:

• a housing, which encloses a circulation chamber through which a medium can flow, into which heating ribs extend essentially parallel to one another, each of the ribs having a fixed end, a free end, and a U-shaped recess which opens into a uniform connecting chamber, which is separated from the circulation chamber by a partition wall provided in the region of the open ends of the U-shaped recesses, and which accommodates at least one PTC heating element that abuts oppositely situated inner sides of the U-shaped recess in heat-conducting contact,
• wherein successive heating ribs protrude inwards from oppositely situated inner sides of the housing, wherein
• a flow passage of a meander-type flow channel is formed in the housing between the free ends of the successive heating ribs and the adjacent inner wall of the housing, the said flow passage being closed off by a covering element on the side oppositely situated to the partition wall, and wherein
• the exposed lateral faces of the ridges exposed to the flow channel are concave in shape, so that a hollow-shaped recess is formed between the inner wall and the heating rib.