Sliding vane pumps

Four-Lobe Pump Sliding Vane Pump... 

Pumps, sliding vane cast iron with pump, base plate, hear box or coupling but excluding motor. FOB cost 10000 at a capacity = 10 L/s with n = 0.75 for the range 0.4-120. L+M = 1.6-2.3. L/M = 0.15. Factor without motor, X 1.00 ... 

The sliding-vane compressor is widely used as a vacuum pump as well as a compressor, with the largest volume approximately 6,000 cfm. The lower end of the volume range is 50 cfm. A single-stage compressor with atmospheric inlet pressure is limited to a 50 psi discharge pressure. In booster service, the smaller units can be used to approximately 400 psi. 

Vacuum breaker, 291 Vacuum pump, 9 Vacuum service, 10 ejectors in, 11 liquid pi.ston, 9 liquid piston, 130 sliding vane, 10 Valve design, 62 Valve loss, reciprocating, 62 Valve unloader, 81 Valve velocity, 62 Valves... 

Figure 3-65C. Sliding vane rotary pump. (By permission, Blackmer Pump, Dover Resources Co.)...

Figure 6-39 illustrates a single-stage rotary vane vacuum pump, without external cooling jacket. The sliding vanes (No. 7 in illustration) are oiled by a closed system to aid... 

The sliding vane compressors and vacuum pumps have internal sliding vanes mounted longitudinally on an eccentric rotor in the body casing, Figures 12-114 and 12-115. 

This example of a single-rotor type pump makes use of an eccentric shaft on which are mounted several sliding vanes (see Figure 3-60). The vanes are forced against the... 

Figure 3-60. Sliding vane pump (single rotor) [17],...

In much the same manner as pumps, compressors are classified as one of two general classes positive displacement or dynamic (see Figure 3-68) [23]. These two general classes of compressors are the same as that for pumps. The positive displacement class of compressors is an intermittent flow device, which is usually a reciprocating piston compressor or a rotary compressor (e.g., sliding vane, screws, etc.). The dynamic class of compressor is a continuous flow device, which is usually an axial-flow or centrifugal compressor (or mix of the two). 

Figure 8.35. The sliding vane rolary compressor and vacuum pump...

Sliding vane, rotary blowers and compressors 346 --------- vacuum pumps 365... 

Due to the friction of the sliding vanes, the biggest pump size available (water cooled) is about 4001/s. Smaller pumps (0.5-51/s) are air cooled. 

Figure 7.19. Some rotary positive displacement compressors, (a) A two-lobe blower, (b) Performance of a two-lobe blower (Rools-Connersville Co.), (c) A screw pump with one power and two idle rotors (Kristal and Annett, 1940). (d) Performance of 3.5" screw pump handling oils at 1150 rpm against 325 psig (Kristal and Annett, 1940). (e) Principle of the liquid ring seal compressor (Nash Engineering Co.). (0 A sliding vane blower (Beaeh-Russ Co.).

Related Calculations. Use this procedure for any type of rotary pump—gear, lobe, screw, swinging-vane, sliding-vane, or shuttle-block—handling any clear, viscous liquid. Where the liquid is gas-free, apply only the viscosity correction. Where the liquid viscosity is less than 600 SSU but the liquid contains gas or air, apply the entrained or dissolved gas correction, or both corrections. 

Figure 6-5. Cross section of a sliding vane vacuum pump and how it operates.

Several types of compressor have characteristics intermediate between those of PD compressors and centrifugal or axial-flow compressors. These include the lobe type, sliding vane, and liquid piston. For all these, the discussion of compressor work and compressor efficiency applies just as well as the above-mentioned types. Descriptions of the mechanical arrangements of these can be found in texts on pumps and compressors [2]. 

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