Pumps – Processes
Patent
1998-11-30
2000-08-29
Freay, Charles G.
Pumps
Processes
417 54, 417189, F04F 1924, F04B 1924
Patent
active
061098825
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to the field of jet technology, primarily to liquid-gas jet apparatuses, which are intended for creation of excessive pressure in different industrial processes.
The operational method for a liquid-gas jet apparatus is known, according to which a vacuum in a gas reservoir is generated owing to evacuation of a gaseous medium from the reservoir by the jetting of a liquid medium. The liquid medium under high pressure is delivered into the nozzle of a jet apparatus which is hydraulically connected to a reservoir (see, for example, book of K. P. Shumski, "Vacuum apparatuses and instruments", M., Mashgiz, 1963, p.476-477).
However, liquid-gas jet apparatuses implementing such an operational method have a low efficiency factor (high energy consumption). Therefore they are not widely used.
As the starting point for this invention the authors selected an operational process of a liquid-gas jet apparatus, consisting of feed of a liquid medium under high pressure into the jet apparatus' nozzle, discharge of the liquid medium through the nozzle, and evacuation and compression of a gaseous medium by the liquid jet flowing from the nozzle. The required pressure of the gaseous medium at the inlet of the jet apparatus is provided (see USSR Certificate of Authorship No. 754118, M, cl. F04 F5/02, 1980).
The imperfection of this operational process is its low efficiency since the maintaining of the required pressure at the jet apparatus' gas inlet is accompanied by considerable energy losses.
SUMMARY OF THE INVENTION
The technical problem to be solved by this invention is an increase of efficiency of a liquid-gas jet apparatus due to reduction of energy losses in said apparatus.
The solution of the problem is ensured by the following. The operational process of a liquid-gas jet apparatus, consisting of feed of a liquid medium under high pressure into a nozzle, discharge of the liquid medium through the nozzle, evacuation and compression of a gaseous medium by the liquid jet flowing from the nozzle, so that the required pressure at the gas inlet of the jet apparatus is provided, is supplemented by the following steps: after the required pressure of the gaseous medium at the gas inlet of the jet apparatus is obtained, the ratio of the liquid pressure in the nozzle of the jet apparatus to the pressure at the outlet of the jet apparatus is reduced in magnitude. Such is reduced in magnitude down to the value or magnitude at which an abrupt increase of the pressure of the gaseous medium occurs at the gas inlet of the jet apparatus. This value of the ratio is registered as the minimum value for such ratio. Then the final operational value or magnitude of the ratio of the liquid pressure in the nozzle of the jet apparatus to the pressure at the outlet of the jet apparatus is set. The final operational value of the ratio must be greater than the registered one.
It is expedient to reduce the value of the ratio of the liquid pressure in the nozzle of the jet apparatus to the pressure at the outlet of the jet apparatus either by reducing the liquid pressure in the jet apparatus' nozzle or by simultaneous boosting of pressure at the outlet of the jet apparatus and reducing the liquid pressure in the nozzle of the jet apparatus.
Experimental research has proven that specific pressures at the liquid inlet and at the outlet of a liquid-gas jet apparatus are required for maintaining the necessary pressure in any closed space, for example in a degasifier or in a vacuum rectification column. Because of the inaccuracy of existing calculation methods it is very difficult to ensure the efficiency factor of a liquid-gas jet apparatus to more than 30% when the optimal pressures at the liquid inlet and at the outlet of the jet apparatus are predetermined by calculations. It is ascertained that after the required gas pressure at the gas inlet of a liquid-gas jet apparatus is obtained, one may reduce pressure of the liquid fed into the jet apparatus, or boost pressure at the outlet of the j
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patent: 5628623 (1997-05-01), Skaggs
Shumski K.P., "Vacuum apparatuses and instruments" book, 1963, USSR, Moscow, "Mashgiz" Publishing house, pp. 476-477.
Evora Robert Z.
Freay Charles G.
Oathout Mark A.
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