| 摘要 |
<p>The air compressor (10) comprises a reservoir (12), a pump unit (14), a motor (16), a transmission belt (18) wound around a driving pulley (20) torsionally coupled to a shaft of the motor (16) and around a driven pulley (22) torsionally coupled to a shaft of the pump unit (14), wherein the spokes (28) of the driven pulley (22) are shaped as fan blades, in such a manner that the driven pulley (22) performs not only the function of transmitting torque to the shaft of the pump unit (14) but also the function of cooling the pump unit (14). The compressor (10) further comprises a belt guard (30) which encloses the transmission belt (18), as well as the driving and driven pulleys (20, 22). The belt guard (18) is made as a cover and comprises a front wall (32), in which slits (34) are provided for allowing air drawn from outside by the driven pulley (22) acting as fan to pass therethrough, a side wall (36) which encloses laterally the space around the transmission belt (18) and around the driving and driven pulleys (20, 22), and a rear wall (38) which closes on the rear side the space around the transmission belt (18) and around the driving and driven pulleys (20, 22) and has an opening (40) for receiving the pump unit (14), in such a manner that air drawn from outside through the slits (34) provided in the front wall (32) of the belt guard (30) is conveyed towards the pump unit (14). The rear wall (38) of the belt guard (30) is shaped so as to cover the pump unit (14) by at least 30% of the depth of the pump unit (14).</p> |
