| 摘要 |
<p>The heater body is for a heating system working in the low-temp. range. It may have one or more fans pref. mounted below the heat-exchanger body. The fan (16) is driven by a rotor (20) in the path of the heating medium, and which is coupled to the fan runner (21) via a magnetic coupling (25). The runner can be of the axial-flow type, with non-magnetic blades (24) on whose periphery permanent magnets are mounted (28). The blades can be of plastics the magnets being cast into them.</p> |
