Fluid handling – Systems – Valves with separate – correlated – actuators
Patent
1982-08-16
1984-08-28
Schwadron, Martin P.
Fluid handling
Systems
Valves with separate, correlated, actuators
137100, 137607, 1376254, 12820328, F16K 1116
Patent
active
044678347
DESCRIPTION:
BRIEF SUMMARY
For medical, scientific or industrial applications, there is an increasing need for gas mixtures having a specific composition. Most of the time mixtures with two components are involved and apparatus are now on the market that make it possible to make gas mixtures from unit gases in the proportions required for the desired application.
The simplest of these apparatus have two gas intakes which must be fed at a specific pressure. On each pipe there is a valve followed by an apparatus making it possible to measure the flow of the gas. To obtain a specific mixture, at a desired flow, it is necessary each time to make a calculation and to make an adjustment with valves which make it possible to obtain the required flow of each component. If it is desired to change the total flow of the mixed gas, it is necessary to make a new calculation and to adjust individually the new flow calculated for each of the components.
More improved apparatus have a device that makes it possible to stabilize the intake pressure of each of the components, a mixing valve having a graduated control element making it possible to display the composition of the desired gas mixture, an adjustment valve for the flow followed by a measuring instrument making it possible to regulate the desired flow. Although presenting significant progress with respect to the previously descibed apparatus, they still present numerous drawbacks, particularly in accuracy of the mixtures which does not remain stable when the flow is varied and the necessity, to adjust the desired flow, of making an adjustment of the flow while reading the result of the operation on a flowmeter. It is well known that the accuracy of flowmeters often leaves much to be desired. Because of the necessity of reading the flow, these apparatus are very difficult to integrate into automatic process lines where it is still often necessary to obtain gases mixed in specific proportions.
This invention has as its object to eliminate said drawbacks and to make it possible to obtain with ease gas mixtures with specific composition at the desired flow.
The invention has as its object a device for mixing two fluids, particularly two compressed gases, comprising an intake pipe for each of the fluids, a pressure regulating device that makes it possible to deliver each of the two fluids at a specific pressure to a constriction that is appropriate for it, each of the two constrictions having an adjustable section and opening into a mixing chamber, means making it possible to cause the section with the constrictions to vary from zero to a maximum.
The specific object is obtained as a result of the fact that the device comprises two control elements, one of the elements providing the control of the total flow of the mixture of the fluids by a control acting on the two constrictions and causing their free section to vary in the same direction from zero and according to a factor of linear proportionality between the two sections, the other element providing the control of the ratio of the mixture by a control acting on the two constrictions and causing their free section to vary in the opposite direction from each other and according to the same factor of linear proportionality between the two sections.
The accompanying drawing diagrammatically illustrates, by way of example, several embodiments of the mixing device, the object of the invention.
FIGS. 1 and 2 show two basic diagrams of the apparatus.
FIG. 3 illustrates an example of mechanical construction.
FIG. 4 shows an electronic control device.
FIG. 5 shows a mechanical control variant.
FIG. 1 illustrates the basic diagram of a device comprising two pipes 1 and 2 for bringing two different gases to be mixed. Each of these pipes is associated with a pressure reducing valve or pressure regulator 3 or 4. The two gases are thus introduced into two chambers 5 and 6 opening through constrictions 7 and 8 into a mixing chamber 9 provided with an outlet pipe 10 for the mixed gas.
Constrictions 7 and 8 have a variable section which can be modified by val
REFERENCES:
patent: 1855505 (1932-04-01), Wilson
patent: 3875968 (1975-04-01), Olofsson et al.
patent: 4019523 (1977-04-01), Clark et al.
patent: 4150684 (1979-04-01), Kervin
patent: 4237925 (1980-12-01), Urnshida
Rochat Jean-Denis
Zellweger Conrad
Groff, Jr. Emory L.
Hepperle Stephen M.
LN Industries S.A.
Schwadron Martin P.
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