Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1987-09-30
1989-04-04
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
137495, 137613, G05D 700
Patent
active
048176591
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to fluid metering apparatus, and more particularly it relates to an apparatus for automatically metering gas into liquid, e.g. chlorine into water.
PRIOR ART
There is known an apparatus for automatically metering gas into liquid, comprising, successively arranged along the gas supply line, a gas flow meter, a flow governor, a vacuum check valve and an ejector for preparing a gas-liquid mixture. The ejector is hydraulically connected with the supply line of the liquid being gasified, including a liquid flow meter. The known apparatus further comprises a control system to whose inputs signals are sent from the outputs of the liquid and gas flow meters, the system incorporating a master control for presetting the required gas-liquid ratio. The control system generates at its output a signal sent to the input of the gas flow governor to maintain the preset gas concentration in the liquid (see SU Inventors' Certificate No. 292540; Int. Cl..sup.2 G01F 13/00, published in 1973).
However, this known apparatus is incapable of ensuring adequate accuracy of maintaining the required concentration of the gas in the liquid when the degree of absorption of the gas by the liquid sharply varies, or else when the liquid flow rate fluctuates rapidly.
There is further known an apparatus for automatically metering gas into liquid, e.g. chlorine into water, comprising, successively arranged in the gas supply line, a gas pressure regulator, a gas flow meter, a gas flow governor, a vacuum check valve and an ejector connected to the supply line of the liquid to be gasified, the liquid supply line including a liquid flow meter. The apparatus further comprises a control system having its respective inputs connected to the liquid and gas flow meters, and its output connected to the actuating mechanism of the gas flow governor (see U.S. Pat. No. 4,232,700; Int.Cl..sup.3 G05D 11/08, published in 1980).
This known apparatus also comprises means for measuring the concentration of the gas in the liquid, incorporated in the liquid supply line downstream of the point of connection of the ejector to this line, at a distance therefrom. A signal coming from the concentration measuring means corrects the setting of the master control of gas-to-liquid ratio.
This apparatus provides for accounting for a varying degree of absorption of the gas by the liquid and thus for maintaining a required concentration of the gas in the liquid.
However, this last-described known apparatus is structurally complex, its mechanical part incorporating a relatively great number of components including those with non-linear response such as the vacuum check valve, which causes oscillating processes in the control system affecting quick restoration of a preset liquid-to-gas ratio.
DISCLOSURE OF THE INVENTION
This invention is to provide an apparatus for automatically metering gas into liquid which is structurally simplier and has fewer non-linear elements in its mechanical portion in order to improve the quality of regulation and to make the apparatus more reliable.
This object is attained in an apparatus for automatically metering gas into liquid, comprising, successively arranged in the gas supply line, a gas pressure regulator, a gas flow meter, a gas flow governor, a vacuum check valve and an ejector connected to the supply line of the liquid being gasified, a liquid flow meter in the liquid supply line and a control system having its respective inputs connected to the outputs of the gas and liquid flow meters and its output connected to the actuating mechanism of the gas flow governor, in which apparatus, in accordance with the invention, the gas flow governor and vacuum check valve are integrated in a single unit including a sealed chamber having its two opposite walls formed by two substantially parallel diaphragms, a hollow cylinder being accommodated between the two diaphragms, having its one end fixedly attached to one of the diaphragms for reciprocatory oscillation therewith axially of the cylinder and hav
REFERENCES:
patent: 2938539 (1960-05-01), Holmes
patent: 2982300 (1961-05-01), Jackson
patent: 4232700 (1980-11-01), Sutt
Cohan Alan
Tallinskoe Proizvodstvennoe Upravlenie Vodosnabsheniya I Kanaliz
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