US3631875A

US3631875A - Fluid impact deflector amplifier

Info

Publication number: US3631875A
Authority: US
Inventors: Robert Eugene Raymon Ducousset; Claude Fernand Emile Larmurier; Jean-Noel Gston Andre Rolland
Original assignee: Compteurs Schlumberger SA
Current assignee: Compteurs Schlumberger SA
Priority date: 1968-12-13
Filing date: 1969-12-08
Publication date: 1972-01-04
Anticipated expiration: 1989-01-04
Also published as: DE1962377A1; GB1236499A; FR1598420A

Abstract

An impact deflection fluid amplifier comprising a plate provided with a main supply channel and a secondary supply channel placed coaxially so as to transmit two opposing jets, the jet coming from the main supply channel having a higher pressure, two control channels placed facing each other, perpendicularly to the common axis of the supply channels and on the side of the main supply channel, and two regenerating channels placed symmetrically in relation to said axis, on the side of the secondary supply channel.

Description

United States Patent 11113,631,875

[72] Inventors Robert Eugene Raymond Ducousset [56] Ref e Cit d Gama; UNITED STATES PATENTS Claude Fernand Emile Larmurier, Paris; 3 272 215 9H9 t I 1 37/81 5 JeamNoel Gston Andre Rolland, ornsen e a Mommuge not France 3,323,532 6/1967 Campagnuolo l37/8l.5 3,326,227 6/1967 Mitchell l37/81.5

[2]] Appl. No. 882,883

[22] Filed DE 8, 1969 I 3,444,878 5/1969 Mayer l37/8l.5 [45] Patented Jan 4, 1972 3,446,228 5/1969 Stouffer l37/8l.5 3,500,846 3/1970 Wood l37/81.5 [73] Assgnee 5:12:2 Des Cmlmu" 3,520,316 7/1910 Colston l37/81.5 [32] Priority Dec. 13, 1968 Primary Examiner-Samuel Scott [33] France AltomeyPierce, Scheffler & Parker [31] 178096 ABSTRACT: An impact deflection fluid amplifier comprising [54] FLUID IMPACT DEFLECTOR AMPLIFIER a plate provided with a main supply channel and a secondary 2 Claims, 4 Drawing Figs. supply channel placed coaxially so as to transmit two opposing 52 U.S. c1 137/s1.s the jet from channel having a [51] Int Flsc higher pressure, two control channels placed facing each 501 Field of Search l37/81.5 0th, perpendicularly the axis Ofthe s"PPIY channels and on the side of the main supply channel, and two regenerating channels placed symmetrically in relation to said axis, on the side of the secondary supply channel.

PATENTED JA! 4 I972 SHEET 1 BF 2 PMENTEU JAN 4 I972 SHEET 2 BF 2 l I l l l l l l Pressures 1'12 Zaars FLUID IMPACT DEFLECTOR AMPLIFIER The present invention concerns a fluid impact deflection amplifier for obtaining differential output pressure, proportional to an input differential pressure.

There already exist a certain number of fluid amplifiers effecting such function; this is the case of amplifiers of the jet deviation type. These known amplifiers have a certain number of disadvantages: their output pressure is generally low, and their power gain only slight.

The invention especially has the object of avoiding such d'madvantages.

It essentially consists of utilizing a secondary jet, in opposition to the main jet which has a higher presure, so as to efiect an impact whose form varies very appreciably as soon as a transverse disturbance is applied to the main jet, the amplifier makes a kind of bidimensional impact modulator of a very different type from conventional impact modulators which have neither differential inputs nor outputs.

The invention more precisely has for its object an impact deflection fluid amplifier characterized in that it comprises a plate in the body of which is provided a main supply channel and a secondary supply channel placed coaxially so as to.

transmit two opposing jets, the jet coming from the main supply channel having a higher pressure, two control channels placed facing each other, perpendicularly to the common axis of the preceding channels and adjacent the exit of the main supply channel, and two regenerating channels placed obliquely at anacute angle to the axis of the secondary supply channel and adjacent the exit thereof.

Other characteristics of the invention will be revealed by the description which follows, made with regard to the accompanying drawings, concerning a special embodiment given by way of nonrestrictive example.

FIG. 1 is a diagrammatic view in section of the impact deviation amplifier.

FIG. 2 is a diagrammatic representation of the form of the impact of two jets in the absence of cross-control pressure.

FIG. 3 is a diagrammatic representation of the shape assumed by said impact when a transverse control pressure is applied.

FIG. 4 is an illustrative diagram.

In FIG. 1, one sees the amplifier formed by an assembly of channels, engraved, for instance in a plate P, and closed by means of a flat lid (not shown).

The reference numeral 1 designates the main supply channel, and the reference 2 the secondary supply channel. Said channels are arranged coaxially facing each other, so as to emit jets in opposition, the jet coming from the channel I having a higher pressure than that coming from the channel 2. Two channels 3 and 3' placed symmetrically in relation to the axis XX of the

channels

1 and 2, on both sides of the channel 2, form the output ducts for the output pressure of the amplifier. Two channels 4 and 4', placed facing each other, perpendicularly to the axis XX, on either side of the channel 1, form the control ducts of the amplifier. Between the

channels

1 and 2, there is a wide transversal groove 5 letting the air in.

The amplifier operates as explained hereafier.

In the absence of the transverse control, the impact of the two jets, called power, coming from the

channels

1 and 2, has the shape shown in FIG. 2. The two resultant jets pass entirely through the channels 3 and 3', and the pressures are then equal in these two channels.

If one applies on the channel 4', for instance, a pressure called control pressure" the jet coming from the channel 1 incurves, and the position of the impact is moved from A to B as shown in FIG. 3. The pressure passing through the channel 3 increases, whereas that passing through the channel 3 diminishes considerably, and possibly as shown in dash and dotted line in said FIG. 3, part of the fluid may pas through the open air groove 5.

The pressure of the fluid passing by channel 3 depends on the pressure in channel 4. One this obtains at the output of the channels Q, 3, a considerable variation of differential pressure resulting from a low variation of the control pressure,

from which comes the amplifying effect.

The amplifier being symmetrical in relation to the axis XX, it goes without saying that one can use either one or the othei of the channels 4 and 4' for applying the control pressure, and that one can also use these two channels at the same time. The diflerence of the output pressures P, and P5, passing through the channels 3 and 3' is proportional to the control pressure of the channel 4, or to the control pressure of the channel 4', or to the difierence of the control pressures P. and F1, in the channels 4 and 4'.

In a particular embodiment the pressures of the

supply channels

1 and 2 are P,=0.35 bars and P,=0.30 bars respectively. FIG. 4 shows how, in this example, the difference of the output pressures Py-P 'varies with respect to the difference of the control pressures PrP t FIG. 4 shows particularly that if the pressures of the control channels are equal, no amplifying effect occurs and the output pressures are the same. On the contrary, if there is a slight difference between the pressures of the control channels 4 and 4', one obtains a high difierence between the pressures in the output channels 3 and 3' and therefore a great amplifying effect. Experiments have shown that the amplification is linear as long as the difl'erence between the two control pressures does not exceed 0.02 bars and the amplifying effect is then The above experiment as well as many other experiments made by applicant, show that amplifying performances according to the invention are better than those of jet deviation amplifiers. It has been possible to obtain gains of pressure three to four times higher, with a very important signal noise ratio. This advantage results from the fact that instabilities ascertained with jet deviation amplifiers in the vicinity of a separator (or bevel) are eliminated by means of a secondary jet coming from the channel 2. The separation is then done in a purely fluid manner by an interacting of two opposed flows defining a line of demarcation, whereas the separation is effected, with known amplifiers, by an exclusively mechanical means due to a separator-bevel.

Another advantage of the amplifier according to the invention, which is also confirmed by experiment, is the ability to regenerate at the output, a very much larger percentage of the supply pressure from the main channel.

We claim:

1. An impact deflection fluid amplifier for obtaining amplified differential output pressure comprising a platelike body having a main supply channel and an opposed coaxial secondary supply channel for supplying opposed jets of fluid, supplemental channels open to the air intersecting said supply channels at the intersection thereof, the jet from the main supply channel being at a higher pressure than the pressure of the jet from the secondary supply channel, two opposed control channels normal to the axis of the main supply channel and adjacent the exit thereof for supplying control fluid pressures to deviate the jet from the main supply channel and two opposed regenerating channels extending at an acute angle to the axis of the secondary supply channel and adjacent the exit thereof for receiving the fluid introduced by said supply channels under pressures which are dependent on the pressures issuing from said control channels.

2. An impact deflection fluid amplifier as claimed in claim 1 wherein said supply channels, control channels, supplemental channels and regenerating channels have axes lying in a common plane, said two regenerating channels extending at substantially the same acute angle to the axis of said secondary supply channel.

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