US1665279A - Multipressure regulator - Google Patents

Description

April 10, 1928. 1,665,279

S. B. REDFIELD MULTIPRESSURE REGULATOR Filed Sept. 19, 1927 INVENTOR. nowdmlz Rwymid H15 ATTRNEY,

Patented Apr. 10, 1928;

"FFHIC T- snownm 13, REDF 'ELD, or EASTON, re'msmvama, ASSIGIN'OR o INGERSOLL-BAND COMPANY, OF JERSEY CITY, NEWZJER-SEY, A CORPORATION OF NEW JERSEY.

mumm'a' ssem REGULATOR;

application filed September 19, 1927; seri'ai no 2203a.

This inventionrelates to compressors, but more particularly, to a pressure regulator adapted to operate at difie'rent pressures in" the receiver tank for controllingthe communicationbetween theco'mpre'ssor cylinder 7 and the intake supply.

Gil'ob'ectbf'the invention is to enable automatic unloading of the compressor cylinder at" dilferent pressures in the re-' ceive'r' and-ithus hold the ressure in the -receiver tank between a maximuman'cl a minimum predetermined value.

ressure fluid at maximum ressure for Overcoming the inertia of the element intender? to be actuated thereby and" after element has; been set inop eration' to sup 'ly' pressure fluidtherete of lov'ver value su eien't to assurecontinued operation and age; awn-ch at the same time to actuate the unloading element of the compressor wviththe reduced operating pressure and" thus 'm'ai tam the receiver pressure substantially at the desired operating pressure.

@the objects will be in part obvious and in art pointed "out hereinafter. V

' he inventioirconsistsbf the combination of'elefri'ents and arrangement of parts-hav in the general mode of operation substan tie as h'ereihafterdescribe'd and claimed accompanying d w;

, Referring w the-drawings, designates a compressor cylinder having an inlet opening B and a discharge opening C. The cylma e is provided with theusual inlet valves D which" control commuhicationbe' tweenthein-let opening B and the co n'pressionicharnber Between the compression dancer E and the discharge "opening 0 is djsigdse d' the discharge val e F for controiing" communication between thesevelements.

n thprsent afia an intake unloader valve isuisposed joi er'thev inlet opening Bfto tanta um ma e-sway 1:01 the cyliae-e; A. j The animate valve illustrated 1 stand an pre sures low the maiiiinum'pres isfof'a wen known type comprising a casing H inwvhich sfidably 'a'valve J for controllin the admission plortsK a'ndL girl the casing "The ewe J' is normauy zle into the burner or is being supplied. V p

'In order t O'i'ne'et botho fitheserequire" merits, means are prci' i ded for unloading the" compressor, either 'When it is" desired to held open by a spring 0 Which may be pro- I vided with suitable adjusting means,'as for instance, a screiv P for'regulating the ten sion of said spring 0. V i

Connectedto the discharge opening C is a pipe Q through Which pressure fluid co npressed 7 in the compression chamber E may bec'onveyed to a receiver tank R.

In certain lines of Work einpl'oyin'g pres-fl sure fluid, it is essential that pressu'refiuid :of a high valuebe available for overcoming the inertia of the element or material intended tobe actuated thereby: and after such element has been'set in action that/its 1 constant actuation at a satisfactory speed be maintained at a lower pressure; This" g1s particularly the case in devi'ces for feeding fuel, such as pulverized) coal; through a noZ- kiln Whichfth'e fuel maintain the pressure in'th'e re= ceive'r B or the m nimum pressure. These means in the present instance comprise a casing S having a pair o'f valvechainbers' T andTI which communicate with an lntermediate chamber in the casings through ports W for admitting pressure fluid from the valvechambers Tan'd' U into a cylinder loader valve H, and in. which cylinder X is disposecla piston Y adaptedtc be pressed against the valve J rbydpressur'etfluid for closing said valve J. The" piston is prothrough atmosphere, I r

valve c for controlling the aperture valve and may be attached at rearward end in any sultablemamrer to a diaphragm d clamped between the casing S and a'eup Disposed the valve chamber T 'X farming anfintegral part ofthe intake un- The valve may be in theforln of'a ne'e'dle i a U shaped cover (3 in which is disposed a" spring V f. j The springif nay be calibratedto With 1 7 end andwitlritsother end. against a t-spring plug which in turn bears against a set screw it in the cover 6 whereby the tension ofthe spring: f maybe regulated. VPre'ferably, the inner surface of the diaphragm (Z is constantly exposed to pressure fluid from the'receiver R and such pressure fluid is conveyed to the chamber T through a pipe leading from the receiver tankR,

Similar means are providedfor closing the valve J at a minimum pressure in the 'lGCClVGIi tank RV or, in otheruvords, that minimum pressure at which the element to be:

actuatedmay be keptin operation after the initial introduction oi. the maximum pressure'to thework. These means accordingly also comprise a cover 6, a diaphragm la c Sand a needle valve 0 secured tothe diato affordcommunication between said-pasclamped-between said cover and the casing phragm k for controllingcommunication be.- tween the valve chamber U and the intermediate chamber V. A springp calibrated to withstand all pressures up to-what may ibetermed thejminimum pressure in the re .zwhichis disposed a three-way valve 8 of a well known type. The three-way valve a in this instance hasa.:transverse passage '5 extending therethrough to afford communication between the sections of the pipe g and a passage iu leadingfrom the passage t sage, t and a pipe '0 through which pressure fluid maybe conveyed to the work. Thevalves has 'asuitable lever w formanual operation of said valve. 7 p The operation of the device is as follows:

With'the" valve J in theposition shown, J

atmospheric air, or. pressure fiuid from a lower stage cylinder, may pass freely through the portsK and L of the casing H,

"through the inlet valve D into the compression chamber E, from whence after being compressed/to a higher stage, it mayjpass from the discharge valve F, and through the connection Q, into the receiver tank R; It

then it be assumed that thevalve s has been rotatedto such a position as tocutoff all communication betweenthe receiver tank'R and'the work as well asthe valve chamber U, the pressure in the receiver tank R will :ove'rcomethe force of the spring be built up to that value at which it may After the pressure in the tank R reaches this value, such pressure acting against'the diaphragm d willraise the valvec andpermit the passage of pressure fluidinto the. cylinder X to act against the piston :Y "and thusfclosethe valve J and cut ofthe intake,

supply to the compressor cylinder A. The

valve J will be thus held closed as long as the pressure in the receiver tank that of the spring 7. 1 p a It, with the pressure in the receiver tank R- at maximum,-the valve :8 be rotated to R- exceeds the position shown in the drawing, an ade-v V quate supply of pressure fluid of the desired higher pressure may be admitted to the Work to impart to such work the initial heavy impulse required to set it in operation. At the' same time While the valve 8 is in this position, pressurefluid will enter the valve: chamber U' and, acting against the diaphragm is, will open thelvalveo and admit pressure fluid into the cylinder X to compressor cylinder A will remain unloaded until the pressure in the receiver tank It has been reduced to a value which will enable the spring 39 to close the needle valve 0 and again permit the spring 0 to open the valve J.

While two of the positions of theivalve s have been described as .well as what follows hold the valve J closed. In this way the I i while the valve is in these positions, it will be apparent that by turning the valve 3 to i a position where communication may exist only between the receiver tank R and the pipe 0 leadingto the work, the controlling means associated with the valve chamber U will remain inoperative and only that controlling means associated with the valve chamber Twill control the intakeunloader valve J. As a result, a'constant maximum,

pressure may be maintained in the receiver tank R for an indefinite period. 5

Although only two pressure controlling devices are illustrated vin the'drawings, one to operate at maximum pressure and the other at all pressures between the maximum v I and the minimum pressure in the receiver tank, it will be obvious that other similar devices maybe-included as well as suitable controlling means, such as the valve 8' to maintain constant pressures in the receiver,

tank It other than. maximum and minimum as hereinbefore described.

l claimf n 1. In a .multi-pressure regulator, the com bination of a compressor 0 linder having an'inlet opening and a disc arge opening, a receiver tank gconnected to the dischargeopening, an intake unloading valve controly ling the inlet'opening, a casing interposed between the intake unloader and the receiver tank having a pair of valve chambers, valves.

controlling V chambers and the unloader valve, diaphragms connected to the valves exposed to receiver pressure,-and springs acting on. the 1' diaphragms tending to holdiths valve closed,

oneof said springs being adapted to yield to a lower receiver'pressure than the other spring for admitting pressure fluld to the communication between the unloader valve for closing said unloader valve and thus cut oil the intake'supply to the compressor cylinder. 7 V 2. In a multi-pressure regulator, the combination of a compressor cylinder having an .inlet opening and a discharge opening, a

receiver tank connected to the discharge opening, an intake unloader valve controlling the inlet opening, a casing interposed between the intake unloader andthe receiver tank having a pair of valve chambers, valves controlling communication between the chambers and the unloader valve, diaphragms connected to the valves, springs acting on the diaphragms tending to hold adapted to Withstand a greater pressure than the other spring, means for constantly ex-' posing that diaphragm against Which is exerted the greaterspring pressureito receiver pressure, andmeans for selectively exposing the other diaphragmto-receiver pressure for closing the unloader valve at a minimum pressure and maintain a constant predetermined minimum pressure in the receiver tank.

In testimony vvhereof I have signed this specification.

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