Heat exchanger arrangement

A vehicle heater, comprising a burner area to be supplied with combustion air and fuel and a heat exchanger arrangement comprising:

• a pot-shaped inner heat exchanger housing with a first bottom wall and with a first circumferential wall adjoining the first bottom wall and surrounding a longitudinal axis;
• a pot-shaped outer heat exchanger housing with a second bottom wall and with a second circumferential wall adjoining the second bottom wall and surrounding the longitudinal axis;
• a fluid flow space formed between the inner heat exchanger housing and the outer heat exchanger housing;
• a first flow guiding formation extending essentially in the direction of the longitudinal axis along the first circumferential wall and the second circumferential wall and a second flow guiding formation extending essentially in the direction of the longitudinal axis along the first circumferential wall and the second circumferential wall at a circumferentially spaced location from the first flow guiding formation, wherein the first flow guiding formation and the second flow guiding formation divide a part of the fluid flow space formed between the first circumferential wall and the second circumferential wall into a first partial flow space and a second partial flow space;
• at least one fluid inlet opening, open towards the fluid flow space in a circumferential area of the first partial flow space, and at least one fluid outlet opening, open towards the fluid flow space in a circumferential area of the second partial flow space;
• and
• a press fit formation for fixing the inner heat exchanger housing in relation to the outer heat exchanger housing, the press fit formation comprising at least one of the first flow guiding formation and the second flow guiding formation in an end area of the circumferential walls located at a distance from the first bottom wall and the second bottom wall, the heat exchanger arrangement transferring combustion heat generated in the burner area to a fluid flowing through the fluid flow space, wherein the press fit formation on at least one of the first flow guiding formation and the second flow guiding formation comprises a radially outwardly oriented first press fit surface and a radially inwardly oriented second press fit formation surface pressed against the first press fit surface, at least one of the first flow guiding formation and the second flow guiding formation comprising at least one radially projecting first web on one circumferential wall from among the first circumferential wall and the second circumferential wall and a recess receiving the at least one first web on another circumferential wall from among the first circumferential wall and the second circumferential wall, the first web having a radially oriented end face providing a press fit surface of the first press fit surface and the second press fit formation surface and the recess having a radially oriented recess bottom surface providing another press fit surface of the first press fit surface and the second press fit formation surface, wherein the end faces of the at least one first web are located at a radially spaced location from the associated recess bottom surface in a length area of the at least one flow guiding formation adjoining the press fit formation.

A heat exchanger arrangement, for a vehicle heater, the heat exchanger arrangement comprising:

• a pot-shaped inner heat exchanger housing with a first bottom wall and with a first circumferential wall adjoining the first bottom wall and surrounding a longitudinal axis;
• a pot-shaped outer heat exchanger housing with a second bottom wall and with a second circumferential wall adjoining the second bottom wall and surrounding the longitudinal axis;
• a fluid flow space formed between the inner heat exchanger housing and the outer heat exchanger housing;
• a first flow guiding formation extending essentially in the direction of the longitudinal axis along the first circumferential wall and the second circumferential wall and a second flow guiding formation extending essentially in the direction of the longitudinal axis along the first circumferential wall and the second circumferential wall at a circumferentially spaced location from the first flow guiding formation, wherein the first flow guiding formation and the second flow guiding formation divide a part of the fluid flow space formed between the first circumferential wall and the second circumferential wall into a first partial flow space and a second partial flow space;
• at least one fluid inlet opening open towards the fluid flow space in a circumferential area of the first partial flow space and at least one fluid outlet opening open towards the fluid flow space in a circumferential area of the second partial flow space;
• and
• a press fit formation for fixing the inner heat exchanger housing in relation to the outer heat exchanger housing, the press fit formation provided in an end area of the circumferential walls located at a distance from the first bottom wall and the second bottom wall and the press fit formation comprising at least one of the first flow guiding formation and the second flow guiding formation, wherein the press fit formation on at least one of the first flow guiding formation and the second flow guiding formation comprises at least one first press fit surface oriented in a first circumferential direction and at least one second press fit surface oriented in a second circumferential direction opposite the first circumferential direction and pressed against the at least one first press fit surface, at least one of the first flow guiding formation and the second flow guiding formation comprising at least one radially projecting first web on one circumferential wall from among the first circumferential wall and the second circumferential wall and a recess receiving the at least one first web on another circumferential wall from among the first circumferential wall and the second circumferential wall, the first web having lateral web surfaces providing first press fit surfaces and the recess has lateral recess surfaces oriented in the circumferential direction providing second press fit surfaces, wherein in a length area of at least one of the first flow guiding formation and the second flow guiding formation adjoining the press fit formation, the lateral web surfaces are located at a circumferentially spaced location from the associated lateral recess surfaces.

A vehicle heater, comprising a burner area to be supplied with combustion air and fuel and a heat exchanger arrangement comprising:

• a pot-shaped inner heat exchanger housing with a first bottom wall and with a first circumferential wall adjoining the first bottom wall and surrounding a longitudinal axis;
• a pot-shaped outer heat exchanger housing with a second bottom wall and with a second circumferential wall adjoining the second bottom wall and surrounding the longitudinal axis;
• a fluid flow space formed between the inner heat exchanger housing and the outer heat exchanger housing;
• a first flow guiding formation extending essentially in the direction of the longitudinal axis along the first circumferential wall and the second circumferential wall and a second flow guiding formation extending essentially in the direction of the longitudinal axis along the first circumferential wall and the second circumferential wall at a circumferentially spaced location from the first flow guiding formation, wherein the first flow guiding formation and the second flow guiding formation divide a part of the fluid flow space formed between the first circumferential wall and the second circumferential wall into a first partial flow space and a second partial flow space;
• at least one fluid inlet opening, open towards the fluid flow space in a circumferential area of the first partial flow space, and at least one fluid outlet opening, open towards the fluid flow space in a circumferential area of the second partial flow space;
• and
• a press fit formation for fixing the inner heat exchanger housing in relation to the outer heat exchanger housing, the press fit formation comprising at least one of the first flow guiding formation and the second flow guiding formation in an end area of the circumferential walls located at a distance from the first bottom wall and the second bottom wall, the heat exchanger arrangement transferring combustion heat generated in the burner area to a fluid flowing through the fluid flow space, wherein the press fit formation on at least one of the first flow guiding formation and the second flow guiding formation comprises at least one first press fit surface oriented in a first circumferential direction and at least one second press fit surface oriented in a second circumferential direction opposite the first circumferential direction and pressed against the at least one first press fit surface, at least one of the first flow guiding formation and the second flow guiding formation comprising at least one radially projecting first web on one circumferential wall from among the first circumferential wall and the second circumferential wall and a recess receiving the at least one first web on another circumferential wall from among the first circumferential wall and the second circumferential wall, the first web having lateral web surfaces providing first press fit surfaces and the recess has lateral recess surfaces oriented in the circumferential direction providing second press fit surfaces, wherein in a length area of at least one of the first flow guiding formation and the second flow guiding formation adjoining the press fit formation, the lateral web surfaces are located at a circumferentially spaced location from the associated lateral recess surfaces.