Hollow cylinder pump

Example 6.3 The Synthesis of the Hollow Cylinder Pump We take building block 1 and use the inner surface of a hollow cylinder as the moving surface. The procedure follows the same conceptual lines of design as outlined in the previous examples and it is clearly demonstrated in Fig. E6.3a. A small variation is to have the entrance and exit ports at different ends of the shaft, as shown in Fig. E.6.3b. 

Fig. E6.3a The synthesis of a hollow cylinder pump, (a) The building block (b) a rotating hollow cylinder forms the moving plane (c) the stationary plane is formed by the outer surface of a solid stationary shaft. A channel block separates inlet and outlet. Feeding and discharge are carried out through slits in the shaft leading to axial holes drilled in the shaft (d) the two surfaces that form a shallow curved channel are bounded by a sidewall or flight running along the circumference of the shaft.

Fig. E6.3b Side view of a hollow cylinder pump with feed port at one end of the shaft and discharge at the other end.

Fig. E6.1a The synthesis of a roll pump from building block 1. (a) The building block (b) a rotating solid cylinder forms the moving surface (c) the inner surface of a hollow cylinder forms the stationary surface. The two surfaces create a curved shallow pumping channel. Entrance and exit ports are formed by openings in the outer cylinder, and they are separated by a channel block (d) side view of the roll pump.

Example 6.6 The Synthesis of the Rotating Cup Pump We now take building block 2 and pair it with both a rotating solid cylinder and a hollow cylinder to create two moving planes, as shown in Fig. E6.6a. The separation between the axial inlet and outlet ports machined into the cover plate [Fig. E6.6a] is a bit cumbersome and has to be created by an axial channel block attached to the cover plate and extending into the cup. Apparently, no such machine actually exists and it may not be too useful, but the point is that this... 

Fig. E6.6b The synthesis of the free rotating flight pump from building block 2. (a) an annular channel is created between the rotating shaft and hollow cylinder (b) the channel is twisted and extended into a helical spiraling channel (c) the channel is formed by a spiral that rotates between a stationary shaft and stationary barrel, with a feed port and exit port machined into the barrel.

In order to achieve a favourable load curve, the stator casing is mostly made in the form of a thick-walled hollow cylinder as a semi-finished forging of material C22.8 (as per VdTUV 350) for temperatures up to 350°C or an austenitic stainless steel. Its cylindrical construction makes it easy to calculate the load curve as described in the AD data sheets (Figure 4). The add-on components, the spacer with the pump casing and the motor sealing cover are bolted to the motor by means of concentrically arranged high-pressure expansion bolts. 

The anode is a hollow cylinder, typically about 10 cm in diameter, rotating at several thousand revolutions per minute in a vacuum of roughly lO Torr with a steady circulation of water at a typical flow rate of 20 liters per minute. Usually, a tuibomolecular pump is used for maintaining the very low pressure inside the tube. 

The core part of a hollow-fiber bioreactor is the hollow-fiber membrane module, also simply known as the cartridge. It consists of a plastic cylinder containing hundreds of semi-permeable capillary tubes, known as hollow fibers. The cells are inoculated in the extracapillary space (ECS). The cells colonize the external surface of the fibers and grow in this region. The culture medium is pumped through the lumen of the fibers, known as the intracapillary space (ICS), as shown in Figure 9.11. 

In sewage treatment plant processes as well as in chemical and mining processes, gas is sparged in the hquid. The impeller of the mixer is then used to provide dispersion of the gas and circulation of the tank contents. For radial machines, a small radial impeller is installed at the bottom to mix the gas. In the case of hydrofoils, different approaches are used. If the shaft and blades are hollow, gas may be pumped through the shaft and blades. In other apphcations, the impeller is contained within a cylinder that is within the tank. This prevents flooding the impeller with gas. 

Fig. 5.2 Schematic diagram of hollow fiber spinning system (i) nitrogen cylinder, (2) dope reservoir (2) gear pump (4) on-line filter, (5) syringe pump (6) spinneret (7) forced convective tube (S) roller (9) take-up drum (10) refrigeration/heating unit (11) coagulation bath (12) washing/ treatment bath (13) take-up bath (14) schematic spinneret. [1]...

---