US2268000A - Hydraulic control for pumps and the like - Google Patents

Description

Dec, 30, 1941. R. B. TREER 'HYDRAULIC CONTROL FOR PUMPS A ND'THE LIKE Filed March 1 9, 1940 2 Sheets-Sheet 1 1NVENTOR. .S5 5. 77@@72 ATTORNEY. l

Dec. 30, 1941. R. B. TREER HYDRAULIC CONTROL FOR PMPS AND-THE'LIKE Filed March 19, 1940 2 Sheets-Sheet 2 INV ENTOR. ,055 726677 ATTORNEY.

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Patented 30, 1941 UNITED Is'riuli-:sl

PATENT OFFICE 2,268,000 HYDRAULIC CONTROL FOB PUMPS THE Ross B. Trcer, Lakewood,

Ohio. usino! of Ime- Ohio , half 'to Edwin J. Hull, Cleveland,

Application March 19, 1940, Serial No. 324,814

's claims.

My invention pertains to 'adjustable multiple impeller pumps and more particularly to a quick adjustable pump having ahydraulically operated adjusting mechanism, and the present invention is an improvement on the pump disclosed in my copendlng patent application, Serial Number 296,896, filed /28/39. and' the copending application of Edwin J. Hull, Serial Number 309,089,

illecl December 13, 1939.

` such a pump having a plurality of pump plungers .and guide passages. each plunger sliding into one end of an individual guide passage, a pair of ports opening into each guide'passage at axially spaced points, a check vvalve plunger slidable into the opposite end of each guide passage and appreaching the inner end of each pump plunger in the inter-port portion of the passage to positively prevent reverse flow of iluid from the outlet port to the inlet port and to determine thequantity of iluid to be trapped in the interport passage by each stroke of each pump plunger, biasing means urging each valve plunger to move into said passage past the outlet port to positively cut oil re-A verse now oi.' iiuid therein from'the outlet port to the inlet port, stop means for limiting the move.- ment of each valve plunger into the passage, means for adiustably supporting the stopmeans for movement to various positions to vadjustably limit the inward movement of said valve plunger by the biasing means to predetermine the quantity of liquid trapped in the interport portion of the passage to be displaced by each inward movement of the pump plunger, hydraulic actuator means for moving said stop means, conduit means, and control valve means associated with said conduit meansv and arranged for selectively increasing, holding constant or decreasing the pump capacity by selectively connecting the hydraulic actuator either to receive high pressure pumped iluid to move the stop means to oppose .the movement of the valve plunger by thebiasing means, or to a neutral position to seal in received iluid, or to a position to open a discharge connection for discharging iluid from the hydraulic actuator in response to, pressure applied thereon by the valve plunger biasing means.

(ci. 10s- 173) I Further objects and advantages are within the scope of my invention, such as relate tothe arrangement and function of the related elements of the structure, to various details oi construction and to combination oi parts. elements per se, and to economies of manui'acture'and to numerous other features as will be apparent 'from a consideration of the speciiication in conjunction 'with the drawings disclosing a speclilc form ot my 1d invention, similar reference characters being applied to similar parts throughout, and, in which: Fig. 1 is a longitudinal sectional view through the quick adjustable multiple impeller pump and with the manually actuable valve set Vfor holding l5 the adjustment constant;

Fig. 2 is a similar view of a portion thereoi.| showing the manual valve set for injecting high pressure pumped fluid into the hydraulic actuator for increasing the pumping capacity. the conduit passages being connected to but one pumping unit instead of to a plurality of such units.

Fig. 3 is a similar'vlew of a portion thereof showing the manual valve set for releasing iluid from the hydraulic actuator to decrease the pumping capacity, the conduit passages being connected to butI one pumping unit instead of to a plurality of such umts.

Referring more particularly to Fig. 1 of the 3o drawings, my quick adjustable pump comprises a pump body I having an inlet port 3 and an outlet port 5 opening into the body and intercep'ting" a cylindrical guide passage or bore 1 at axially spaced points thereof. 'I'he guide passage I is drilled through the pump body I and the opposite ends of the passage open from opposite sidesof Y the body. The portion 9 of the guide passage 'I to the right oi' the inlet port 3 serves as a guide passage for slidably receiving a pump plunger II 40 and the left hand portion I3 to the left of the outlet port 5 serves as a guide passage for a valve plunger I5 and the interport passage at times receives the inner ends of both plungers in a manner to be subsequently described. The intermediatek portion 'I of the guide passage may for convenience be termed the inter-port passage or it may-be regarded as a valve inlet passage since all the iluld approaches the valve plunger I5 through this passage.

As Shown, another pair of ports 3 and 5 enter the opposite side of the pump body I in spaced` relation and similarly intercept a cylindrical guide passage 'I at'axial spaced points along the passage cooperating with a pump plunger II and a check valve plunger I5 in a similar manner. It

subsequently described. The outer ends of thev ports 3 and 5 may be provided with any suitable pipeiitting arrangement for convenient connection with pipe lines. y

A drive shaft I1 has one end journalled in a bearing I9. centrally disposed-in the end of the pump body, and which may be of a friction reiucing type having steel ball bearings 2|. 'I'he other end of the drive shaft is journaled in a friction reducing bearing 23 centrally disposed in an end cover plate 25 from whence the drive shaft is extended for connection with any suitable external source of power (not shown). The journalled portions of the drive shaft are in axial alignment and are connected through an intermediate portion 21 which is relatively inclined for tilting a wobble collar 29 journalled thereon. as shown, and more fully described in my previously mentioned patent application. Similarly arms 3| extend laterally with projecting ballconnectors 33 extending into U-shaped sockets 35 on the ends of the pump plungers II which are thereby reciprocated in the guide passages 9 as the drive shaft |1 rotates. From the adjacent side of the pump bodyl I a shell 31 extends, enclosing a chamber 38 around the driving mechanism and has a thick internal flange 39 around the outer end to which the cover plate 25 is attached by bolts 4I passing therethrough. Any suitable lubricant may be provided in the enclosing chamber for lubricating the driving mechanism of the pump.

. From the opposite side of the pump body, a shell 43 extends defining a valve chamber 44 which encloses the valves and the valve adjusting mechanism. A cover 45 is snugly secured to the outer edges of the shell 43 as by bolts 41 passing therethrough. The cover 45 is provided with an aperture 49 in alignment with each valve plunger I5 and suitably threaded for receiving a threaded plug 5|.. In the outside of each plug 53 is a suitable aperture for receiving a wrench for screwing the plug into or out of the cover. A. spring receiving recess 55 is provided in the inner end of each plug 5| for receiving the outer end of a compression valve spring 5%1, the inner end of which presses against a lateral flange 59 on the valve plunger I5 which is thereby continuously, biased to enter the valve guide passage I3. A guide pin 90 extends from the valve plunger I5 concentrically into the spring 51.

Stop means is provided for limiting the inward movement of the spring biased valve plunger I5 for which purpose I provide an adjustable stop member or collar 9|. The stop collar 5| is of a generally circular or annular conformation having recesses 93 through which the valve plungers I5 slide freely until the inward movement of each plunger is limited by the engagement of each .lateral flange 59 against the stop collar 5|. The

piston member 81 which projects thereinto from the central portion of the valve body I. The cylinder 95 of the stop collar 3| slides over the stationary piston 01 in snug iluid retaining relation and the latter has circumferential packing receiving grooves 99 for receiving any suitable packing material II therein to provide a snug fluid retaining seal.

Passing centrally through the stationary piston 81 Isa central cylindrical bore 13 which extends into the center of the pump body I and connects at the inner end through a passage 15 to one of the inlet ports 3. Opening from the outlet port 5 is a passage 11 which intercepts the central bore 18 through an axially elongated slot 19 in the side wall thereof. Opening centrally through the stop collar 5I and cover 45 are cylindrical bores 8| and 83 in alignment with the central bore 13 in the body and of a similar diameter. From the cylinder 85 in the stop collar 5| a passage 85 extends and opens through the side wall of the central bore 8| passing therethrough by way of two dlametrically opposed ports 88 or a single semi-circular groove port.

A manual valve plunger 81 slides in snug fluid retaining relation through the central bores 83, 9| and into the central bore 13 in the valve 'body I. From the inner end of manual valve plunger 81 two passages 89 and 9| are drilled axially therein, the latter being closed by a plug 92 at its inner end. The axial passages 89 and 9| open outwardly through ports 93 and 95 in the outer side wall of the portion of the manual valve plunger 81 which slides through the bore 8| in the stop collar 8| for conductive connection with the port 85 therein. The ports 93 and 95 open from the outer wall of the manual' valve plunger 81 at axially spaced points therealong such that either passage 89 or 9| may be conductively convslot port 19 in all positions of the plunger for continuously applying the high pressure pumped iiuid therein from the outlet port 5.

a link |03 extending plvotally from a pivot pin |02 in a bracket member |04 on the cover 45. The outer end of the manual control valve plunger 81 is connected to an intermediate portion of' .the hand lever 99 by a pivot pin |05. The operator grasps the upper end of the hand lever and because of the leveragev obtained easily moves the manual control valve plunger 91 in or out of the pump to quickly and conveniently adjust the per stroke pumping.

In operation thedrive shaft I1 is rotated by any external source of power causing the pump plungers I| to reciprocate in the guide passages l in a m'anner more fully described in my copending patent application previously mentioned. As a pump plunger moves to the right out of the inter-port passage, fluid rushes in from inlet port 3 to fill the space evacuated by the plunger. Moving to the left, the inner end of the pump plunger starts to enter the adjacent end of the inter-port passage 1 trapping therein-a quantity of fluid which is then pushed forcefully along, moving the check valve plunger to the left, openassenso te the duties t and discharging there from; As the pump plunger il moves in the right, the check valve plunger follows and, enter'-,

ing the other end oi' the inter-port passage 1, positively restricts the reverse ow of fluid from' the outlet port through passage 1 toward the inlethport 3. The distance that the inner end of the valve plunger enters into the inter-port passage 1 determines the quantity of liquid that will be trapped therein by the next inward move,- ment of. the pump plunger and this is determined by the position of the stop collar 9i which by engagement .with nange 59 on the valve plunger limits its extreme inwardmovement.

' To conveniently and quickly adjust the stroke by stroke pumping capacity of the pump plungers to suit all conditions oi' demand and of the density and viscosity of diiferent liquids to be dispensed. it is only necessary for the attendant to shift the hand lever 99. l

To increase the capacity of the pump, the lever 99 is moved to the left to draw the manual control valve plunger 91 to the left until port 9B" therein is conductively connected with the port 96 in the stop collar BI, as shown in Fig. 2. when high pressure pumped fluid ows from outlet passage 9 by way of passage' 11, slot port 19, plunger port 91, plunger passage 9|, plunger port 95, stationary port 89, and thence by way of pmage 95 into the cylinder 99. As the high and the present disclosure is illustrative merely,

the invention ccmprehending all variations' and an outlet port opening into each guide paspressure pumped fluid enters the cylinder 89 in the stop collar 8l, the entire stop collar is caused to slide back on the stationary piston support memberl 91 thereby engaging all the lateral anges 59 on all the sliding valve plungers I5 atan earlier point of the'inward movement thereof. The inner ends of the valve plungers must still enter the adjacent ends of the interport passages 1 to serve their functions as check valves, but because of not entering so far into the interport passages a larger quantity of liquid is received therein to be advanced by the next inward movement of the respective pump plungers.

When the pump capacity has been suillciently increased, the lever 99 is actuated to move the control valve plunger 91 to the neutral position when the plunger ports 93 and 95 are disposed l as shown in Fig. 3, on opposite sides of the stationary port, 86, which is thus closed to seal in the cylinder 95 the liquid received therein. 0r as the stop collar El moves to the left, POlhs 93 and 95 are automatically disposed on opposite sides of port 88. In the neutral position of the lever 99, the adjustment of the pump is held constant.

When it is desired to adjust the pump to decrease the pumping capacity of each pump' plunger, the lever 99 is moved to the right moving the control valve plunger-91 to the right until the plunger port 99 conductively connects with the stationary port 89, as shown in Fig. 3. In this position the iluid previously injected into sage at. axially 'spaced points therein, a pump plunger slidable back and forth in fluid displac-l ing relation in the end of each guide passage adjacent the inlet port for opening and closing the inlet port and for moving entrapped iluid through the interport passage'toward the outlet port, a drive shatt'journalled substantially centrally with reference to the cylindrical arrange- 'ment of the guide passages in the pump block, power transmission means operatively connecting between said drive shaft and the pump plungers stop member for movement to simultaneouslyadjust the innermost position of all saidvvalve plungers to fpredetermine the 'quantity of entrapped liquid in the interport portion of eachl passage to be displaced by each inward movement of each pump plunger, a hydraulic actuator for moving said stop member, conduit means. and control valve means conductively connected with said hydraulic actuator and said conduit means and arranged for selectively operating 'said hydraulic actuator to move the stop member in either direction. or to hold stationary.

2. A compact adjustable capacity multiple impeller pump comprising, a pump block, a plurality of guide pwsages in said pump block and opening therefrom at the opposite ends, said guide passages being disposed substantially parallel to each other in a substantially cylin-` drical arrangement in said pump block, an inlet port and -an outlet portopening into eachguide' passage at axially spaced points therein, a pump plunger slidable back and forth in fluid displacing relation in the end of each guide passage adjacent the inlet port for opening and closing Athe inlet port and for moving entrapped nuici` through the interport passage toward the outlet port, a check valve plunger slidably disposed in the other end of, each guide passage adjacent the outlet port for opening or closing the outlet the cylinder escapes by way of passage' 85, v

ports 96 and 93, axial passage` 99 in the plunger 81, into the 'central bore 13 at the inner end of the control plunger 91, thence by way of passage 15 in the pump body to the low pressure inlet port 9. The tension of all the compression valve springs 51 pushes'the stop collar member 6I to the right expelling uid from the cylinder 65 Auntil the hand lever 99 is again moved to a neutral position. l

It is apparent that within the scope of the invention, modifications and different arrange-y ments may be made other than therein disclosed,

port, a valve spring for continually biasing each A valve plunger into the guide passageto move in past' the outlet port and into the interport passage, .a stop collar havingA apertures through which the valve plungers slide, engageable means4 displaced by each inward movement of eachpump plunger by adjusting the extent of the insertion of the inner endoi each valve piston into the inter-port passage,'a hydraulic actuator i'or shifting said stop collar, conduit means, and manually movable control valve means conductivelyconnected with said hydraulic actuator and Y said conduit means and arranged for ,selectively operating said hydraulic actuatory toinovejthe stop collar in either direction. 3. The combination with a multiple impeller pump comprising, a pump block having a plurality of guide passages, an inlet port and an outlet port opening at axially spaced points into an intermediate portion .of each passage, a pump" quantity of fluid to be trapped in the intermediate portion of each passage between the inlet and outlet port connections, oi' means for controlling the pumping capacity of all ofthe pumps simultaneously comprising an engageable means on each valve plunger, an apertured stop collar through which the valve plungers pass for engaging the engageable means for limiting the inward movement of each spring pressed valve plunger, a piston projection extending centrally from the pump body toward the stop collar, a central cylinder recess in the stop collar for receiving said piston projection in slidable iiuid retaining relation therein for` supporting said stop collar for movement to various positions relative to the pump block to predetermine the inner extreme position of the valve plungers for adjusting the quantity of entrapped liquid in the interport portion of each passage to be displaced by each inward movement of each pump plunger,

said cylinder recess and piston projection forming a hydraulic `actuator for moving said stop collar, conduit means, and control valve means conductively connected with said cylinder recess and said conduit means and arranged-for selectively connecting the cylinder recess with the pump inlet or outlet or for disconnecting it from either.

4. A compact adjustable -multiple impeller pump comprising the combination set forth in claim number 3 in which the control valve means includes a manually actuable control valve plunger sliding through central apertures in said stop collar and the piston projection, and conduit means controlled thereby including passages extending along in the plunger and opening laterally from the sides o! the plunger for selectively connecting conductively with and between the cylinder recess and the inlet and outlet passages in the pump body.

5. A compact adjustable capacity multiple impell'er d pump comprising, a pump block, a pluralityfoi' guide passages, in` said pump block and pening therefromfat' the opposite ends saldi guide passages being'disposdsupstantiauy parellf lel wgeach ether-1h; a; substantially r1ind1c`1'- arrangemen*tA inj'said pump" block'lf-an xinlet port and an outlet port'opening into each guide passage at axially spaced` points therein, a pump plunger slidable back and forth in uid displacing relation in the end oi' each guide passage adjacent the inlet port for opening and closing the inlet port and for moving entrapped fluid through the interport passage toward the outlet port, a drive shaft journalled substantially centrally with reference to the cylindrical arrangement oi the guide passages in the pump block, power transmission means operatively connecting between said drive shaft and the pump plungers for reciprocating the plungers as the shaft rotates, a check valve plunger slidahly disposed in the other end of each guide passage adjacent the outlet port for opening and closing the outlet port, a valve spring for continually biasing each valve plunger into the guide passage to move in 'past the outlet port and into the interport passage, an engageable projection on each valve plunger, a generally annular stop collar having apertures throughV which the valve plungers slide for engaging said projection thereon for limiting the movement of each spring pressed valve plunger into each passage, supporting means for adjustably supporting said stop collar for movement to various positions relative to the pump block to predetermine the quantity of entrapped liquid in the interport portion of each passage to be displaced by each inward movement of each pump plunger by adjusting the extent of the insertion of the inner end oi' each valve piston into the inter-port passage, said supporting means also serving as a hydraulic actuator for moving said stop means, conduit means, and control valve means conductively connected with said hydraulic actuator and said conduit means and arranged for selectively increasing, holding constant, or decreasing the capacity of said pump.

ROSS B. 'FREEB-l

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