Vacuum claw-type

Fig. 2.43. Working schematic of a four-stage dry vacuum pump, type BOC Edwards Drystar GV (Figure from [2.25]). Pump sequence inside one claw.

Figure 5.15 Sectional drawing of the dry claw-type pump EDP 250. (With permission from Edwards Vacuum, Crawley, UK.)...

Q. There are other types of vacuum pumps, seldom found in cleaning machines. A fifth type of pump is a dry pump, which can be a screw, scroll (high speed), or claw design. Booster pumps are also dry and a generally rotary lobe type. 

Claw Vacuum Pump with Inner Compression So-called claw vacuum pumps have been developed both with, and also without inner compression of the taken in vapours, respectively gases. Such pumps with inner compression were and are being manufactured of the three stage type for chemistry applications and attain pressures below 1 mbar absolute. 

An important characteristic of this claw vacuum pump is, that the two shafts which drive the claw impellers, are exclusively suspended within the gear. A bearing on the pump chamber side does not exist. Through this simple design, this type... 

---