Vacuum pump
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United States of America Patent
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Apr 18, 2017
Issued Date -
N/A
app pub date -
Dec 6, 2011
filing date -
Dec 14, 2010
priority date (Note) -
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Abstract
The invention relates to a vacuum pump, in particular a screw pump, having preferably two displacement body shafts (2, 3), coupled via a gearing, which drive displacement bodies (12, 13), and having an inner recess (14), extending in the direction of a geometric axis (A) of the displacement body shaft (2, 3), in which a tubular body (20) extends for conducting cooling fluid while leaving a free space between an inner surface of the recess (14) and an outer surface of the body (20). To provide a vacuum pump which has a configuration having a simple construction and which is effective with regard to cooling power, it is proposed that the body (20) is in addition secured in a separate cover part (15) mounted on the suction-side end of the displacement body (12, 13), and that the free space is formed, at least in part, directly between the body (20) and the inner surface of the displacement body (12, 13) and extends continuously from the cover part (15) to a securing region of the body (20) in the displacement body shaft (2, 3), in a region of the displacement body shaft (2, 3) associated with the motor/gearing housing (4) of the displacement body shaft (2, 3).
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