Fluid handling – Systems – Multiple inlet with single outlet
Patent
1998-07-17
2000-01-25
Hepperle, Stephen M.
Fluid handling
Systems
Multiple inlet with single outlet
417196, G05D 1103
Patent
active
060168404
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to the area of jet technology, primarily to liquid/gas ejector devices used for the creation of vacuum.
From prior level of technology, liquid/gas ejector devices, containing and active nozzle, receiving chamber, mixing chamber, diffuser and jets, delivering active and passive media are known (see, for instance: R. P. Shurnsky "Vacuum apparatuses and devices," M., Mashgiz, 1963, p. 476-477).
The drawback of the known ejector devices is the comparatively low coefficient of efficiency. This narrows down the area of applicability of these devices.
The closest analogy, selected by the authors as the prototype of this invention, is the liquid/gas ejector device, containing an active nozzle and a mixing chamber with diffuser. The optimal ratio of the sizes of the mixing chamber and the active nozzle shall be determined from a calculated expression, depending on the ratio of the drop of pressure in the mixture of media and the active liquid medium (see. for instance, the book of Sokolov E. Ya. et al. "Ejector devices", M., Energiya, 1970, p. 209)
Performed tests proved that the ejector devices described above do not provide for the needs in ejector devices. For instance, in the processing of hydrocarbon raw materials, productivity and depth of vacuum, is characterized by comparatively big energy losses in the process of the mixture of media in the ejector device.
SUMMARY OF THE INVENTION
This invention is aimed at the increase of the coefficient of efficiency of the liquid/gas vacuum ejector device.
This problem has been solved in this invention due to the optimization of the process of mixing gas and liquid media.
In accordance with the invention, the optimization of the process of mixing gas and liquid media is achieved by the liquid/gas vacuum ejector device, containing an active nozzle and a mixing chamber. In the vacuum ejector device, the area of the minimum cross-section of the mixing chamber amounts to 201 to 800 times the area of the minimum cross-section of the active liquid nozzle. Additionally the ratio of the distance between the outlet cross section of the mixing chamber and the outlet cross section of the active nozzle to the diameter of the minimal cross-section of the chamber is in the range of 10 to 300.
The conducted experiments proved considerable influence on the value of the coefficient of efficiency by the ejector component of the device for the mixing of active--liquid and passive--gas media. For this reason the optimization of the size of the mixing chamber and of the size of the ejector device is of great importance. Optimization of these two elements will increase the efficiency of the creation of a vacuum.
The production of the vacuum ejector device with the ratio of the sizes, indicated above, creates a homogenous gas-liquid, at the outlet of the chamber. At this point the processes of condensation and dissolution of the component of gas medium would practically be completed. As such, the energy losses in the process of the mixing of media are minimized. Consequently, the losses of energy related to the impact of the jet of liquid on the walls of the mixing chamber will be reduced, along with the hydraulic losses due to friction.
These features of the device will provide for the achievement of the technical objective set forth--that is, the increase of the coefficient of efficiency of the liquid/gas ejector device.
The following is the detailed description of the invention with an example of its realization.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view with a break line representing the described liquid-gas vacuum ejector device.
FIG. 2 is a view taken along line 2--2 of FIG. 1
DETAILED DESCRIPTION OF THE INVENTION
Liquid/gas vacuum ejector device contains an active liquid nozzle 1 mixing chamber 2, and diffuser 3. The area of the minimal cross-section of the mixing chamber 2 (having diameter dmc) represents from 201 to 800 areas of the minimal cross-section of the liquid nozzle 1 (having diameter dn). Stated
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K.P. Shumski; "Vacuum Apparatuses and Devices," Book, 1963, pp. 476-477, Publisher: "Mashgiz", Moscow.
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Certificate of Authorship, SU 1770615 A1, Nov. 26, 1990, Ivano0Frankovsk Institute of Oil & Gas.
Akimov Mikhail V.
Popov Serguei A.
Hepperle Stephen M.
Oathout Mark A.
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