Pumps – Gas pressure exchange using rotary cellular conveyor
Patent
1988-09-02
1989-12-19
Croyle, Carlton R.
Pumps
Gas pressure exchange using rotary cellular conveyor
60 3945, 1235592, F04F 1100
Patent
active
048879428
DESCRIPTION:
BRIEF SUMMARY
The invention relates to pressure exchangers for transfer of pressure energy from a liquid flow of one liquid system to a liquid flow of another liquid system, comprising a housing with an inlet- and outlet duct for each liquid flow, and a cylindrical rotor arranged in the housing and adapted to rotation about its longitudinal axis, and provided with a number of passages or bores extending parallel to the longitudinal axis and having an opening at each end, the inlet- and outlet ducts of the liquid systems forming pairs of ducts provided near the respective end faces of the rotor, and the bores of the rotor being adapted to such connection with the inlet- and outlet ducts of the housing that they alternately carry liquid under high pressure and liquid under low pressure of the respective systems during rotation of the rotor.
From U.S.-PS No. 3 431 747 it is known a pressure exchanger of the above-mentioned type, where a ball has been introduced in each bore for separation of the liquids of the two systems. The ball movement is limited due to the arrangement of a seat or stop in each end of each bore, against which the ball can bear. The seats cause a reduction of the cross-section of the bores, and the balls, the bores as well as the seats are exposed to mechanical wear, which leads to leakage. Further, due to the small clearance between the balls and the walls of the respective bores, a large force has to be exerted against the balls in order to move these at high liquid velocities, which results in an energy loss. When the flows of liquid suddenly stops, caused by the balls shock-like hitting their seats, cavitation may occur, which may be detrimental to adjacent parts. The arrangement of a ball and two valve seats with sealing rings, springs etc. for each bore implies that the device becomes complicated and costly. Further, the above-mentioned wear may necessitate time consuming and costly change of component parts of the pressure exchanger. Due to the arrangement of inlet- and outlet ducts which discharge resp. receive liquid from only one bore at the time, the flow will be intermittent.
The object of the invention is to provide a device which to a lesser degree is burdened with the above-mentioned drawbacks.
The characteristic features of the device according to the invention will be evident from the claims.
The invention will be described in detail in the following description with reference to the accompanying drawing, which shows embodiments of a pressure exchanger according to the invention.
FIG. 1 is a schematic perspective view of a pressure exchanger according to the invention.
FIG. 2 is a sectional view taken along the line II--II in FIG. 1, whereby portions have been removed.
FIG. 3 is a sectional view taken along the line III--III in FIG. 2.
FIG. 4 is a view in the direction of the arrow A in FIG. 2, whereby portions have been removed.
FIG. 5 is a view showing the end piece openings facing the rotor.
FIGS. 6a to 6f are sectional views depicting the mode of operation of the pressure exchanger.
FIGS. 7a and 7b are velocity diagrams depicting the mode of operation of the pressure exchanger.
FIG. 8 is a schematic view of a device according to the invention, whereby the device is connected with two liquid reservoirs.
FIGS. 9a to 9c are views of another embodiment of an end piece.
As is evident from FIG. 1, the pressure exchanger according to the invention comprises a tubular, mainly cylindrical housing 1, which at each end has a circular flange 2, 3 with a number of through-going holes.
Two substantially identical end pieces 4, 5, both being provided with a circular flange 6, 7 with a diameter and through-going holes corresponding to the flanges of the housing, are sealingly fastened to respective end portions of the housing 1, the flanges 2, 3 of the housing 1 being fastened to the flanges 6, 7 of the respective end pieces 4, 5 by means of not shown bolts which are introduced into the holes, and nuts. In order to obtain a tight connection a sealing ring may be provided between the flanges.
A cyl
REFERENCES:
patent: 2675173 (1954-04-01), Jendrassik
patent: 3101168 (1963-08-01), Berchtold
patent: 3145909 (1964-08-01), Gardiner
patent: 3234736 (1966-02-01), Spalding
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patent: 4209986 (1964-10-01), Kentfield
patent: 4269570 (1981-05-01), Rao
patent: 4352638 (1982-10-01), Vallance
patent: 4360316 (1982-11-01), Rahnke
patent: 4529360 (1985-07-01), Kirchhofer et al.
Croyle Carlton R.
Szczecina Jr. Eugene L.
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