Patent ID: 9611852
Date: 2017-04-04
CPC Classifications: F01C,F04C,F04D,Y02B

Claim:
1. A scroll pump comprising: a pump motor comprising a pump motor housing, the pump motor housing comprising an outer peripheral surface; a pump head assembly comprising a stationary plate scroll fixed in the scroll pump, an orbiting plate scroll, and a drive shaft coupling the pump motor to the orbiting plate scroll; a cooling fan that produces a cooling air flow in the scroll pump; a cowling in which the pump head assembly, the pump motor and the cooling fan are housed as juxtaposed with one another in an axial direction of the scroll pump, the cowling having opposite axial ends in the axial direction, the axial ends defining an air inlet and an air outlet, respectively; and a shroud disposed within the cowling and comprising an inner peripheral surface, the shroud extending around the pump motor and spaced radially therefrom such that a tunnel extending longitudinally in the axial direction of the scroll pump is defined between the outer peripheral surface and the inner peripheral surface, wherein: the tunnel is open to and connects the air inlet and the air outlet, and the cooling fan is disposed in the scroll pump such that the cooling air flow produced by the cooling fan flows from the air inlet to the air outlet via the tunnel to cool the pump motor; and the cooling fan is housed within the cowling at the air inlet of the cowling, the pump motor is disposed within the cowling adjacent the air outlet of the cowling, the pump head assembly is interposed in the axial direction between the cooling fan and the pump motor, and the shroud has a first axial end disposed adjacent the pump head assembly and a second axial end at which the shroud is integral with the cowling.