Pumps – Gas pressure exchange using rotary cellular conveyor
Patent
1992-06-29
1994-08-16
Bertsch, Richard A.
Pumps
Gas pressure exchange using rotary cellular conveyor
F04F 1102
Patent
active
053381580
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement in pressure exchangers for transfer of pressure energy from one fluid flow to another fluid flow, in which the pressure exchanger comprises a housing with an inlet duct and an outlet duct for each fluid flow, a rotor which is designed to rotate about its longitudinal axis inside said housing, and has at least one through duct extending from one end of the rotor to the other end, as seen in an axial direction, and alternately connects the inlet duct and outlet duct for one fluid with the outlet duct, and inlet duct, respectively, of the other fluid, and vice versa, during rotation of said rotor.
BACKGROUND AND PERIOR ART
From NO-PS No. 161 341 and U.S. Pat. No. 4 679 393, among others, a pressure exchanger of the above mentioned kind is known, in which the rotor ducts substantially extend along cylinder faces the longitudinal axis of which coincides with the longitudinal rotor axis, and the rotor is made to rotate by the aid of a motor or by the fact that the velocities of the fluids flowing in and out have different components in the circumferential direction, so that the fluid exerts a turning moment on the rotor. Furthermore, the fluid flow may be achieved by the aid of circulation pumps or by the rotating rotor. It is advantageous that the rotation of the rotor provides the flow, because pumps will render the structure more expensive and complicated, especially in case of low pressures and large volumes of passing flow. The above concept, however, has a limited applicability in this connection, since pressure exchangers functioning in this manner can only provide low feed pressures, while most processes in which pressure recovery may advantageously be used, e.g. processes comprising reverse osmosis, require high feed pressures on the high pressure side. Also, with this manner of operating the rotor, only low initial turning moments can be provided so that rotation of the rotor might easily be prevented by particles brought along by the flow. Pressure exchangers are also known, which operate with high volumes of passing through flows and low pressures, but these are complicated and expensive.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a pressure exchanger, which does not show the above mentioned disadvantages.
The arrangement of the present invention is distinguished by the characterizing features appearing from the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is now disclosed in more detail with reference to the drawings, which show diagrammatical views of embodiments of an arrangement according to the invention.
FIG. 1 is a perspective view showing a first embodiment of a pressure exchanger according to the invention;
FIG. 2 is a perspective view of the pressure exchanger of FIG. 1, with the components of the exchanger shown in an exploded view and some of them shown in section;
FIG. 3 is a perspective view of a second embodiment of a pressure exchanger according to the invention;
FIG. 4 shows a very simplified longitudinal section through the longitudinal axis of the rotor, and two rotor ducts which are diametrically placed;
FIG. 5 is a velocity diagram;
FIG. 6 shows a longitudinal section through a rotor of a third embodiment of a pressure exchanger according to the invention.
DETAILED DESCRIPTION
As shown in FIGS. 1 and 2, an embodiment of a pressure exchanger comprises a housing with a top, and a lower end member - or cover 1, and 2, resp., the flanges 4, and 7, resp. of which are connected with flanges 5, and 6, resp. of a housing member 3 extending between the covers, by the aid of screws (not shown) extending through holes 8 in pairs of flanges.
Each end cover 1, 2 has an inlet duct 9, and 11, resp., and an outlet duct 10, and 12, resp., the internal openings of which, i.e. openings 19, 21, 20, and 22, resp., facing the housing member 3, are substantially circular or circle sector shaped and extend across an arc of a circle of approximately 180.degree.. Each end cover has a bearing 13
REFERENCES:
patent: 2675173 (1954-04-01), Jendrassik
patent: 4679393 (1987-07-01), Hellat
patent: 4887942 (1989-12-01), Hauge
Bertsch Richard A.
McAndrews, Jr. Roland G.
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