| 摘要 |
<p>The invention pertains to an air heater, which air heater comprises: -a combustion chamber, -a burner, -a sleeve-shaped heat exchanger, wherein the sleeve-shaped heat exchanger is arranged coaxially with the combustion chamber, -a first annular air passage for heated air, which extends between the combustion chamber and inner wall of the sleeve-shaped heat exchanger, -a housing, in which the heating unit is arranged, in which housing a second air passage for heated air is present between the housing and the sleeve-shaped heat exchanger, -a fan for drawing air into the housing -an air distribution chamber for providing air to the first annular air passage and the second air passage, wherein the front wall of the sleeve-shaped heat exchanger has a frusto-conical shape that converges in the direction away from the fan.</p> |
