Roots Vacuum Pumps 2016 by Leybold

More catalogs by Leybold | Roots Vacuum Pumps 2016 | 40 pages | 2017-05-08

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Page 7 of Roots Vacuum Pumps 2016

general information on roots vacuum pumps applications 10 -2 10 -1 10 0 10 1 1000 m 3 x h-1 600 10 2 torr 750 500 2,3 400 cfm 2 3 4 200 100 2 10 -3 100 1 4 68 10 -2 10 -1 10 0 10 1 pressure 10 2 mbar 10 3 1 pumping speed of the backing pump 2 pumping speed of the roots pump system without pres­ sure equalization line 3 pumping speed of the roots pump system with pressure equalization line 4 pumping speed gained by the pres­ sure equalization line roots vacuum pumps shifting the operating pressure into the high vacuum range 10 -3 pumping speed for many years now roots vacuum pumps have been well established in the area of vacuum technology in combination with backing pumps which compress against the ­atmo­­­­sphere these pumps offer the following advantages comparison of pumping speed characteristics with and without pressure equalization line as a rule of the thumb one may say that roots va­cuum pumps are capable of improving the attainable ultimate pressure of a pump system by a factor of 10 with two roots vacuum pump stages and a corresponding backing pump it is possible to attain pressures in the range down to 10-5 mbar 0.75 x 10-5 torr under certain circumstances this will make the use of additional high vacuum pumps turbomolecular pumps or diffusion pumps unnecessary multiplied pumping speed pump system with wh 7000 roots vacuum pump and sogevac sv 630 b rotary vane vacuum pump due to the non-contact rotation of the impellers roots vacuum pumps are able to run at higher speeds thus a high pumping speed is obtained with a relatively small size pump pumping speeds in excess of 1500 m3/h 589 cfm can only be attained with roots vacuum pumps the use of roots vacuum pumps in the area of vacuum technology has resulted in further specializations and improvements when selecting the right kind of backing pump sizing it will be possible to pump large quan­ti­ties of gas in connection with smaller backing pumps energy consumption of such a pump sys­tem is much less compared to a single backing pump offering the same pumping speed leybold through an integrated bypass pressure equalization line it is also possible to utilize the p ­ umping speed of the roots v­ acuum pump at high pressures and large quantities of gas at an early stage this reduces the pumpdown time especially for cyclic operation see figure “com­par­ison of pumping speed characteristics with and without pressure equalization line” leybold full line catalog fall 2016 high-purity gases or hazardous gases impose strict requirements on the leak-tightness of the system canned motors from the ws line or canned motors from the wh line are hermetically sealed there are no seals in contact with the atmo­ sphere which might be s­ ubject to wear this prevents leaks and fail­ ures due to oil leaks a service life of over 20,000 hours without maintenance is quite c ­ ommon 7