US1454886A - Pump - Google Patents

Description

May 15, 1923. 1,454,886

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PUMP

Filed April 16 1921 l w 3 .r. N www @Hoz nur Patented May 15;, 1,923.

STATES reirse ATENT OFFICE.

JEN V. GIESLER, OF KNOXVILLE, TENNESSEE, ASSIGNOR TO T'HE FULTON COMPANY, F KNOXVILLE, TENNESSEE, A CORPORATION 0F lllIAINE.A

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Application led April 16, 1921. Serial No. 461,949.

To all whom it may cof/wem Be it known that I JEAN V. GIESLER, a citizen of the United tat/es, and a resident of Knoxville, Tennessee, have invented new and useful Improvements in Pumps, which invention is fully set forth in the following specification.

This invention relates to pumps and,

Vwhile capable of use with a wide variety of pumps, has special utility when employed with a pump for fuel feeding systems of the character disclosed in my application for fuel feeding systems, Sr. No. 396,783, led July 16, 1920.

In said application is disclosed a pump wherein the pumping member, preferably of flexible or resilient material, is moved in one direction i. e. on its delivery stroke by the force of resiliency, either inherent in said pumping member or applied thereto by resilient means lcooperating therewith or both. Thereby the length of stroke of said ,pumping member and the pressure exerted thereby are automatically determined by the rate of delivery of the pumped luid, since the pressure on said fluid can not exceed the resilient force by which said pumping member is moved and the stroke of said member is llimited and determined by the pressure developed thereby on said fluid. But, as-

the stroke of said pumping member varies, the mean pressure exerted thereby on'the uid also varies more or less, so that the mean pressure is somewhat higher when the rate of delivery is low and the pumpingr member is making short strokes than it is when the rate of delivery is higher and the pumping member is making full strokes. Consequently, if the force of resiliency for 40 moving said pumping member be designed to afford a desired pressure on the fluid when said member is making its 4full stroke, the pressure on the fluid will be somewhat higher than the desired pressure when the rate of delivery is reduced so that the pump-y ing member does not have to make its full, stroke in order to deliver the required quantity of fluid. This increase in the pressure -under such conditions is sometimes disad- 50 vantageousz-Thus, when the pump is emconsumption is reduced tends to produce a higher fuel level in the carbureter and may result in flooding the latter.

It is an object of this invention to provide a pumpwherein the vpumping p member is moved in one direction by the force of resiliency ^with means for compensating varia-4 tions in said force of resiliency so that said pumping member will exert a substantially uniform pressure on the fluid being Vpumped thereby. f

Another object of this invention is to provide a resiliently actuated. pumping member with 'compensating means which may be ad- Justed to suitparticular requirements and to compensate for different degrees of variation in the resiliency of different resilient elements.

Another object of this inventionv is to provide a resiliently actuated pumping member with compensating means which issimple in construction, easy to install and adjust, and eiicient in operation. Other objects will appear as the description of the invention pro- ',ceeds.

Stated broadly, the invention comprises a pump having a pumping member moved in one direction by the force of resiliency, either inherent in saidpumping member or applied thereto by resilient means cooperating therewith or both, and means cooperating with said pumping member to compensate for changes in the force of said resiliency whereby said member may exert a tion of the limits of the invention, reference y being had to the appended claims for that purpose.

Said drawing represents an axial section through a pump constructed in accordance with the present invention. the illustrated embodiment comprising a pump of substantially the same construction as described and illustrated in my application above identified.

In the form shown, a casingl is provided with valve-controlled inlet and o-utlet connections 2 and 3 adapted to be respectively g preferably composed in whole or in part of a Aflexible wall and, in the form shown, composed of a generally tubular, expansible and collapsible, corrugated wall 4, preferably of resilient material, such as brass, connected at one end to a relatively rigid, movable end wall 5. The opposite end of said corrugated wall 4 is xedly clamped in position in any suitable way, as by clamping the end corrugation or an annular flange 6 suitably secured thereto between the flanged end 7 of the casing 1 and the flanged end 8 of a gear casing 9 to be' referred to. i

Operatively connected to said movable end wall 5, as by means of the axially extending rod 10 threaded thereinto, is means for actuating said pumping member of any suitable construction whereby said pumping member is moved in one direction by some external force acting thereon p and moved in the op osite direction by the force of resiliency, eit er inherent in the flexible Wall 4 or applied( thereto by a resilient, means coacting therewith or both. In the form shown, a yoke 11 is connected to the rod 10 and embraces a camor eccentric 12, said yoke being of such size and arrangement-with respect to said cam or eccentric that "one side of said yoke, that designated 13 in the form shown, is engaged and moved in one direction by the cam or eccentric, during each revolution of the same, to flex the member 4, but the opposite side of said yoke, that designated 14 in the form sho-wn, 1s so lspaced with respect to said side 13 -thatl the eccentric 12 does not engage and move the yoke in the opposite direction. The movement of the pumping member in the latter direction is obtained by the force of resiliency. vThis force of resiliency may be supplied by resiliency inherent in the pumping member, as when the tubular Wall 4 is `made of resilient material, or may be supplied by resilient means cooperating with said member, or the latter resilient means may be employed to coact with and supplement the resiliency afforded by a resilient pumpingl member. VIn the form shown, a coil spring 15 is positionedwithin the tubular wall 4 in engagement with the movable end wall 5 at one end and in en-` gagement with a stationary abutmentwall 16 at its'opposite end and tends to move the end wall 5 and flex the tubular wall 4 in the direction for effecting the pressure stroke of the pumping member. The movable end wall 5 may be desirably supplied with an annular boss 17 to center the coil spring 15 and the abutment wall 16, which may be desirably clamped in position between the flange 6 of the flexible wall and the flange 8 of the gear casing 9, may also be so shaped as to provide a centering boss 18 for said coil spring. In the form shown, said boss is also extended into the interior of the tubular wall 4 and provided at itsi inner end with an annular plug 19 which performs the dual function of guiding the rod 10 in its reciprocal movements and providing a stop against which the movable end wall' may engage andlprevent an excessive collapse of the tubular wall 4.

The cam or eccentric 12 may be driven in any suitable way, the same being shown as mounted on a shaft 20 which also carries a gear wheel 21 in mesh with` a gear Wheel 22 on a shaft 23. On the latter shaft is a chain wheel 24 which may be driven in any suitable way, as by a second chain wheel (not shown), on an engine-driven shaft. A second rod 25 is preferably connected with the side 13 of the yoke 11 and extends coaxially with the rod 10 through an aperture 26 in the wall of the gear casing 9, said rod cooperating with the reciprocal movements of the yoke and the connections therefrom to the movable end wall 5. To prevent rotation of the yoke and connected rods around the axis of the latter, any suitable means may be employed. In the form shown, a bolt 27 extends through the wall of the gear casing 9 and its head carries a pair of lugs 28 between which the yoke 11 is designed to reciprocate.

The pump so far described is of substantially the same construction as described and illustrated in my application above identified. In operation. the cam or eccentric 12 is rotated from the source of power through the gearing24, 23, 22, 21, 20, and at each rotationthereofengages'the side said aperture to guide y 13 of the yoke 11 to positively move said siliency provided by the resiliency inherent in the tubular wall 4 or the spring 15 or both. so that the movable end walli is thereby moved, and the tubular wall 4 flexed, in said opposite direction to provide the pressure stroke of the pumping member. During the latter s troke the side 14 of the yoke 11 is not engaged by the cam or eccentric, the movement of the pumping member being effected solely by the force Y stroke.

Vof resiliencyi therefore, during this stroke,

the pumping member can exert no greater pressure on the fluidbeing pumped thereby than is determined by the magnitude of said force of resiliency. Moreover, as soon as the pressure on thev fluidin the-pump casing 1 equals the magnitude of' said resiliency, the movable vend wall 5 stops in 'its movement toward the left, as viewed on the drawing, and there remains until the cam or eccentric 12 picks upthe right hand side 13 of the yoke 11 in its 'continued rotation to move the pumping member toward the right once more. If little or no fluid is being deliveredthe movable end Wall 5 will stay substantially at the end of its suction stroke, the pressure on the fluid in the' pump casing 1 developed by the force of resiliency acting on the movable end Wall 5 being such as to prevent substantial movement of said movable end wall toward theyleft. Thereby the pressure lon the fluid in the pump casing 1 is automatically determined by the force of resiliency acting on the pumping member and the length of stroke of said pumping member is automatically determined by the rate of delivery of the pumped fluid.

But to move the pumping member against the aforesaid force of resiliency the latent energy of the resilient means, whether the latter be the tubular wall 4 or the spring `15 or both, is increased and this increase of latent energy appears as an increased pressure of lthe pumping member on'the fluid in the casing 1 when said member is adjacent the end of its suction stroke. If the rate of delivery of fluid is relatively large so that the pumping member is making its full stroke, the mean pressure acting on the fluid will be the average of the' pressures acting on the pumping member at the two ends of its If, however. the rate of delivery of fluid is relatively small so that said pumping member oscillates through a relatively short distance adjacent the end of its suction stroke, the mean pressure acting on the fluid in the casing is increased and approximates the pressure acting on the pumping vmember at the end of its suction stroke. Therefore, the mean pressure acting on the fluid in the pump casing 1 varies under the different. rates of delivery `of the pumped fluid and, if the tension of the resilient means be adjusted so as to provide the desired pressure on the fluid when the pumping member is adjacent the end of its pressure stroke, said fluid is subjected to an'increased pressure when the rate of delivery is diminished. While the absolute increase in pressure under these conditions .will not be relatively large, it may be sufficient under certain conditions to result in disadvantageous consequences. Thus, when fuel is i being pumped to a carbureter, this increase of pressure tends to maintain a higher level of the fuel in said carbureter and may cause a flooding of the latter.

In conformity with the present invention, means of any suitable construction4 are pro-- vided to compensate for the variations in the force of resiliency acting on the pumping member so that the pressure exerted by the latter on the fluid in the casing 1 may be maintained substantially uniform Whether said pumping member is making its full stroke or less than its, full stroke and whether it be adjacent one end of its stroke or 'the other. While a variety of means may be. provided for compensatingv for these changes in the force of resiliency, the construction illustrated on the drawing is one of marked simplicity, -inexpensiveness of manufacture, and easiness of installation and adjustment, as well as highly eflicieut inoperation.

stationary members, as lugs 31 on the gear casing 9, and are normally urged toward In the 'form `shown,' a pair of arms 30 are suitably pivoted at one end on 34 which is pivotally connected at its opposite end, at 35, to the rod 25 or an extension thereon, being preferably pivoted on van adjustable sleeve 36 threaded on the end of" said rod. The links 34 together with the spring 32 provide a toggle mechanism which tends to move the rod 25 in the direction of its axis. v

Different springs and different resilient walls, even though made of standard size, differ in their resiliency; moreover, the magnitude of variation in resiliency varies indifferent constructions and under different conditions of use. desirable that the compensating meansvbe readily adjustable so that it may be made to provide the suitable degree and character of compensation for the particular resilient means with which it is associated. ln the form shwn, the coil spring 32 is attached at one end to a collar 37 which is threaded onto 4 a screw 38 carried by one of the arms 30 whereby, by turning said screw in one direction or the other, the tension of said s ring 32 may be increased or decreased. dditionally, the sleeve 36 may beadjusted axially of the lrod 25 to vary the angle yof inclination of the links 34 with respect to said axis.

Therefore, itis highly v Thereby the magnitude of the compensating force provided -by the spring 32 and the. magnitude of its component acting in the direction of the axis' of the rod 25' may be independently or simultaneously adjusted to obtain the compensating action the arms 30 toward the axis of the rod 25 and the force thereby exerted is transmitted by the links 34 to said rod. Furthermore, owing to the inclination of said links to the 5 axis of said rod, a certain component of said pressure is exerted along the axis of said rod in a direction opposite to that in which the force of -resiliency tends to move the pumping member. As the cam or eccentric l 12 rotates to move the yoke 11 and pumping member toward the right, the tension lof the resilient means aliorded by the resilient wall 4 or the spring 15 or both is progressively increased. Simultaneously with this movement, however, the rod 25 moves the pivot 35 of the links 34 toward the right to diminish the angle of inclination of said links to the axis of said rod and thereby permit the arms 30 to be drawn toward each other by the spring 32. This latter action diminishes the force exerted by the spring. 32 tending to move the rod 25 toward the right, in the form shown, and by suitable adjustment of the tension of said spring and the inclination of the links 34, this diminution in the compensating force lcan be made to substantially offset the increase in the tension of the resilient means acting on the pumping member. Conversely, as the pumping member moves toward the left under the force of resiliency, the tension of the resilient means cooperating therewith progressively decreases but, simultaneously therewith, the rod 25 moves 35 the pivot of the links 35 toward the left to straighten out the arms of the toggle and separate the arms 30, increasing the tension of the spring 32. This increase in the compensating force providedby the spring 32 substantially offsets the diminution in the forc'eof resiliency acting on the pumping'member. Therefore, the total force of resiliency acting on the pumping member is maintained substantially uniform and the latter exertsa substantially uniform pressure on the'fluid in the pump casing 1, at whichever endy of its stro-ke said pumping menber may' be and whether the length of said stroke be long or. short.

`While the compensating means of the present invention has been shown as applied to a pump of the construction disclosed in my application above identied. the invenx tion is not restricted thereto, as the same is applicable to a wide variety of pumps and, in fact, possesses utility wherever it-is desired that a pumping member, moved in. one direction by the force of resiliency, shall h avev the variations in said force of resiliency compensated, so -that said pumping member shall afford a substantially uniform pressure on the fluid pumped thereby. Furl"ithermore, While the embodiment of the in'- vention illustrated on the drawing has been @5 described with considerable particularity, it

is to be expressly understood that the invention is not limited thereto as the same is capable of receiving a variety of mechanical expressions, some ot' which will now readily suggest themselves to those skilled i'n the art. Furthermore, changes may be made in the details of construction, arrangement and proportion of parts without de iarting from the spirit of this invention. ei'erence is therefore to behad to the claims hereto appended for a definition of the limits of said invention.

`What is claimed is:

1. The combination of 'a pump casing having inlet and outlet connections, a resilient pumping member in said casing, means whereby said member is flexed in one direction, said member flexing in the opposite direction by the' force of resiliency, and means cooperating with said member to compensate for changes in the force of resiliency by which said member is moved in said last-named direction.

2. The combination of -a pump casing having inlet and outlet connections, a pumping member in said casing, means whereby said member is moved in one direction, resilent means for moving said member in the opposite direction, and means cooperating with said resilient means to compensate for changes in the force of its resiliency during the stroke of said member.

3. The combinationl of a pump casing hav'ng inlet and outlet connections, a resilient pumping member in said casing, means whereby said member is flexed in one direction, resilient means for flexing said member in the opposite direction, and means cooperating with said member to compensate for changes in the force of resiliency of said member and resilient means.

4. The combination of a pump casing having inlet and outlet connections, a flexible pumping -member in said casing, means whereby said member is lexed in one direction, resilient means for lexing said member in the opposite direction, and means cooperating with said pumping member to compensate for changes in the force of resiliency by which said member is moved.

5. The combination of a pump casing having inlet and outlet connections, a pumping member in' said casing, means whereby said member is moved in one direction, resilient means for moving said member in the opposite direction, and means cooperating with said resilient means whereby said member exerts a substantially uniform pressure on the fluid.k in said casing notwithstanding cha-nges in the force of resiliency by which said member is moved.

6.- The combination of a pump casing having ,in let and outlet connections, a resilient pumping member in said casing, means whereby said member is flexed in one direction, said member flexing in the opposite direction bythe force of resiliency, and means cooperating with said member where- .by it exerts a substantially uniform pressure on the fluid in said casing notwithstanding changes in the force of resiliency by which said member is moved.

7. The lcombination of a pump lcasing having inlet and outlet connections, a fiexible pumping member in said casing, means whereby said member is flexed in one direction.l resilient -means cooperating With said member to flex the same in thelopposite direction, and means cooperating with said member whereby the same exerts a sub-- stantially uniform pressure on the uid in said casing notwithstanding changes in the force of resiliency by which said member is 8. The combination of a pump casing having inlet and outlet connections, a resilient pumping member in said casing, means whereby said member is flexed inone direction, said member exing in the opposite direction by the force of resiliency, and toggle mechanism cooperating with said pumping member to compensate for changes in the force of resiliency by which said Ymeans whereby said member is flexed in one direction, resilient means for flexing said member in the opposite direction, and toggle mechanism cooperating with said member whereby the same exerts a substantially uniform pressure' on the fluid in said casing notwithstanding changes in the force of resiliencv by which said member is moved.

11. The combination of a pump casing having inlet and outlet connections, a pumping member-'in said casing, means whereby said member is moved in one direction, resilient means for moving said member inithe opposite direction, toggle mechanism cooperating with said member to compensate for changes in the force of resiliency by which said member is moved, and means for adjustingA said toggle mechanism. I

12. The vcombination of a pump casing having inlet and outlet connections, apumping member in said casing, means whereby vsaid member is moved in one direction, re-

silient means for moving Said.. vfr lembia' in the opposite direction, vtoggle mechanism cooperating with said member to compensate for changes in the force of resiliency by which said member is moved and including a spring, and means for adjustingA the tension of' said spring.

13. The combination. of a pump casing having inlet and outlet connections, a pumping member in said casing, means whereby said member is moved in one direction, resilient mea-ns for moving said member in the opposite direction, a rod operatively connected to said member, one or more pivoted arms, a link pivoted to each arm and to said rod, and a spring cooperating with said link or links to urge said rod in the direction of its axis. v

14. The combination of a pump casing having inlet and outlet connect-ions, a pumping member in said casing, means whereby said member'is moved in one direction, resilient means for moving4 said member in the opposite direction, a rod operativelyv connected to said member, one or more pivoted arms, a link pivoted to each arm and to said rod, a spring cooperating with said link or links to urge said rod in the direction of its axis, and means" for adjusting the tension of said spring. l

15. The combination of a pump casing having inlet and outlet connections, a pump'- ing member in said casing, means whereby said member is moved in one direction, resilient means for moving said member in 'the opposite direction, a rod operatively connected to said member, one or more pivoted arms, a link pivoted to each arm and Vto said rod, means for adjusting the angular relationship of said link or links to said rod, and a spring cooperating with said link or links to urge said rod in the direction of its axis.

16. The combination of a pump casing having inlet and outlet connections, a umping member in vsaid casing, means w ereby 'said member is moved in one direction, resilient means for moving said member in the opposite direction, means cooperating with said me'mbertto compensate for changes in the force of resiliency by which said member is moved, and means for adjust-ing said compensating means.

17. The combination of a pump casing having inlet and outlet connections, a pumping member in said casing, resilient means for moving said member, in one direction, vjand means cooperating with sald member to compensate for changes in the force of resiliency by which said member is moved due to the differing degrees of tension of the same.

18. The combination of a pump casing having inlet and outlet connections, a. ilexible pumping member in said casing, resilient means cooperating with said. member to flex the same in one direction, and toggle mechanism cooperating with said resillent means to compensate for the variations in the force of resiliency/during the fleXure of said member. l

19. The combination of ay pump casing having inlet and outlet connections, a pumping member. in said casing moved in one direction by the'force of reslliency, and means cooperating with said member to compensate for the changes in saidforce of resiliency at diffe-rent positions of said member.

20. The combination of a pump casing having inlet and outlet connections, a resilient pumping member in said casing flexed in one direction by the force of resiliency,

and means cooperating with said member to ving member in said casing, resilient means for moving said member in one direction, and means cooperatingwith said means to compensate for the variations in the force i ot' resiliency of said resilient means arising from. changes in the tension of the same.

In testimony whereof I have signed this Specification-` JEAN V. GIESLER.

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