US2414806A - Diaphragm pump - Google Patents

Description

Jan. 28, 1947: v F|NNEY 2,414,806

DIAPHRAGM PUMP 13 g pvAT-LABEE 'GQPY Filed Sept. '7, 1942 s Sheets-Sheet 1 I JOHN H-\/-F'|NNEY INVENTOR BY I 1947- J. H; v. FINNEY 12,414,805

DIAPHRAGM PUMP Filed Sept. 7, 1942 3 Sheets-Sheet 2 I JOHN H.V.F|NNEY INVENTOR.

Jan- 23, 1947- J. H. v. FINNEY 2,414,306

DIAPHRAGM PUMP Filed Sept. "-7, 1942 E SheetS -Shae't '3 V JOHN Patented Jan. 28, 1947 UNITED1 STATES PATENT OFFIC 2,414,806 DIAPHRAGM PUMP John H. V. Finney, Denver, Colo., assignor to This invention relates to diaphragm pumps and I more particularly relates to pumps of the combination suction and pressure type.

Pumps of this general type utllize'reciprocat ing mechanism producing alternate pressure and suction influences in a chamber in the pump with liquid expelled therefrom'bypressure inj provide a'double diaphragm pump, in which one diaphragm is utilized to efiect the suction lift,

while the other is utilized to develop head of the pump.

Another object of the invention is 'to provide actuating mechanism for a pump of the. double diaphragm type by which rotary motion is converted into straight line reciprocating motion in" a simple, efiicient and economical manner.

Other objects reside in novel combinations and arrangements of parts and a novel mode of operation, all of which-willbe described in greater the pressure detail in the course of the followingdescription- To afi'ord a better understanding of th invention reference will be made to the accompanying drawings illustrating a typical embodiment of the invention. In the drawings, in the several views of which like parts have been designated similarly, Figure 1 is a top plan view of a pump embodying the features'of the present invention;

Figure 2 is a vertical central section through the apparatus illustrated in Figure 1; and I Figure 3 is; an end elevation of the pump.

Suitable valve regula- Mining Process and Patent Company, Denver, 0010., a corporation of Delaware Applicationseptcmbcr 7,1942, Serial No. 451533 13 Claims. (Cl. 103-150) 2 tachment of a suitable fluid supply element (not shown) such as a lose.

A second passage l0. preferably having its lengthwise axis concentric with the axis of pas- -sage I extends from the upper side of housing 5 and the upperend of passage 10 has means l2 for connection with a suitable conductive element (not shown). The lower end of passage II) also is provided with a seat Illa for'a second ball.

The openings in the outer end of housing 5 are closed by sectional wall members l4, while the inner end of the housing terminates in an annular rim l5 shouldered at Hi to provide a seat for a diaphragm unit I! which is bolted thereon as shown at l8.

The housing 5 also is provided with a pressureequalizing passage l9, one end .of which terminates in the intake Opening 7 asindicated at 20, while the opposite end extends through the diaphragm member I! into the space 2| between two flexible diaphragm members 22 and 23, each of which is convex on the side in space H and V concave on the-opposite side, the purpose of which willbe described hereinafter.

The diaphragm member I! comprises an annular rim section 24 of generally U-shaped section, against the opposite sides of which the diaphragm members 22 and 23 are placed and held by two clamping rings 25 and 26. Bolts 21 holdthese parts in their assembled relation.

An opening is provided in member 24 for admission of atmospheric air into the space 2| between the diaphragms 22 and 23, and asuitable valve 28 permits selective control of such air admission.

The diaphragms are adapted for flexure through the provision of a movable clamping member designated generally by the reference numeral 29. This member comprises an end plate 30 carrying a central stop member 3|, a spacing ring 32 inserted between the diaphragms 22 and 23, and a second clamping rin 33, all of the same being held in place by bolts 34. The

plate 33 in turn is connected to an end plate 35 carried on a crosshead 36 of actuating *mech-.

anism 6 by means of a bolt 31, the-inner end of which abuts stop 3i The actuating mechanism in this embodiment l The housing 5 has at its lower end an intake? opening I the upper end of which provides a seat la for a ball -8, while the lower end of "the intake passage is provided with means 9 rural;-

of the invention comprises a rotary shaft 38 jourpivotal connection with a shaft 45, with which crosshead 36 also is pivotally connected. A second the cycle of its movement by eccentric 39.

The crosshead 36 and its associated reciprocating member 29' are supported for movement sub- I stantially parallel to base 4 through the provision of two rocker arms 48 and 49, the lower ends of which are pivotally connected with two shafts 50 and 5| respectively, on base 4. The axes of these shafts are in the same horizontal plane and they are spaced the same distance as the axes of shafts 45 and '46 but in vertical relation are midway between the extreme range of movement of the associated shafts 46 and.

' In operation the inlet 1 is connected with asuitable source of fluid supply through attachmerit of a conduit on means 9 and provision is also made for disposal of liquid discharged through outlet I by connection of a suitable conduit with attachment means l2.

The shaft 38 driven by a suitable prime mover (not shown) rotates the eccentric 39 with the result that an oscillating movement is imparted to shaft 45 on which the end of connecting rod 4| is mounted.

Through the arrangement of 'pivotal supports for crosshead 36, movement of shaft 45 imparts a substantially straight line motion to the end of crosshead 36 carrying diaphragm member 29, with the result that the diaphragms 22 and 23 are moved one way during the forward stroke and in analternate way during thereturn stroke. This diaphragm assembly provides with walls of housing an enclosure for a pressure chamber 52 extending between inlet 1 and outlet Ill. The

elevates ball I3 from its seat, with the result that liquid in chamber 52 is forced through outlet l0 and its associated conduit.

In the aforesa d action. the return stroke causes a flexure of dia hra m 22 which creates a vacuum in the suction line throu h e ualiz ng passage l9 drawing liquid up toward the pump. stroke, the inner diaphragm 23 merely follows along. but does overcome the very slight additional vacuum required to raise ball 8 off seat la. As a consequence of these actions during the,

return stroke the vacuum produced by outer diaphragm22 with valve 8 open extends through space 2|, equalizing passage |9, chamber 52 and in the suction line connected with intake 1. As the vacuum is essentially the same in space 2| and chamber 52, the inner diaphragm '23 has no tendency to change from its convex shap to a concave shape. Due to the vacuum so created liquid flows .in through intake 1 filling equalizing passage I9 and space 2| as well as chamber 52.

On the forward stroke, inner diaphragm 23 alone forces the liquid in chamber 52 past ball l3 and through outlet passage I0. In this action outer diaphragm 22 merely follows along. However, vacuum is maintained in space 2| duringv this stroke, due to the weight of the column of On this 1 4 liquid beneath intake I exerted through equalizing passage l9.

Thus on both the forward and return strokes the outer diaphragm. 22 is under a partial vacuum,

substantially uniform at all-times there is little or no flow of fluid throughequalizing passage I9 during normal operation. a

It also is intended to permit additional control of the suction action by introduction of air into space 2| between the diaphragms. For this purpose a valve 28 communicates with the atmosphere through the wall of rim member 24, andv this valve can be adjusted to admit a selective volume of air into the space 2|. A petcock-type valve has been illustrated but it will be understood any suitable valve mechanism performing the same function may be substituted in place thereof.

ment of parts, the following advantages are derived:

1. The outer diaphragm does the work of lifting the liquid to the pump.

chargingthe liquid from the pump.

3. There is at all times a partial vacuum on the outer diaphragm.

4. On the suction stroke there is no pressure on either side of the inner diaphragm while on so the discharge stroke thepressure on the inner diaphragm is equal to the total head against which the pump is operating.

5. Slight variations in the volume between dia- 5 phragms as occur between mid stroke and extreme stroke, are compensated for by the free flow of 7 liquid through the equalizing passage. 6. The direction of pressure on each of the two pressure is' always exerted against the concave side of each diaphragm. That is, during the suction stroke, the air pressure outside tends to exceed the pressure in space 2|, but such. excess pressure is exerted against the concave side of diaphragm 22. Also, during the pumping stroke. the pressure in chamber 52 exceeds the pressure in space 2|, but is exerted against the concave side of diaphragm 23. Thus. both diaphragms By reason of this combination and arrange diaphragms is never reversed, and the greatertend to retain shape at all times, regardless of the direction in which the pump plunger ismoving, and there is no tendency for either diaphragm to change from concave to convex or vice versa. 7 r

7. Since the pressure on the outerdiaphragm is always inward, the failure of either diaphragm leakage and no liquid is spilled.

8. Regulation as to the amount of liquid being pumped, can be effected by a valve 28 which perthe space between diaphragms.

9. While there is at all times a partial vacuum behind the outer diaphragm, slight leakages and the admission of regulation air 'into the space between diaphragms resultin there being little or results in an inward leakage .of air or an internal mits more or less controlled leakageof air into, 1

'no actual liquid in the space between diaphragms.

While any suitable form of valve and seat arand as the space 2| between the diaphragms is t 2. The inner diaphragm does the work of disa respectively, and balls of suitable size and weight are provided to: seat thereon. However, various types of valves are employed for this purpose in the reciprocating pump art and it is within the intention of. the present invention that such other valve control may be substitutedwhere desired.

What I claim and desire to secure by Letters Patent is:

1. A pump of the character described. comprising a housing having an intake passageand a discharge outlet distant therefrom, two flexible diaphragms supported in spaced relation in the housing and defining with a wall of the housing. a pressure chamber betweenthe intake and the outlet, said diaphragms being in coni cave relation oppositely to each other throughout the stroke of the pump. there being a pressureequalizing passage in the housing, one end of which extends to and is connected with the intake passage, and the other end of which terminates in the space between the diaphragms, a

pressure-actuated valve for controlling the flow of fluid through the discharge outlet, a, suctionactuated valve for controlling the flow of fluid through the intake passage, and, reciprocating mechanism for flexing said diaphragms.

2. A pump of theicharacter described, comprising a housing havin an intake and a discharge outlet distant therefrom, two flexible diaphragmssupported in spacedrelationin the housing and defining with a wall of the housing a pressure chamber between the intake and the outlet, there beinga pressure-equalizing passage in the hous- .ing, one end of which terminates at the intake space between the diaphra'gms, means, including a valve, for admittingj atmospheric air into the "space between the diaphra m, a pressure-actu 6 Q terminates at the intake passage end of which terminates inthe space betweenthe diaphragms, a pressure-actuated valve for conchamber between the intake and the outlet, said diaphragms being in concave relation oppositely to each other throughout-the stroke of the: pump, there being a pressure-equalizing passage in the housing. one end of which terminates at the intake and the other end of which terminates in the space between the diaphragms, a ball valve for controlling the flowof fluid through the discharge outlet, a ball valve for controlling the flow of fluid through the intake, and reciprocating mechanism for flexing said diaphragms. 6. In a pressure pump, inclusive of a suctio line, a discharge line, and a pressure chamber,

a closure for a side of said chamber comprising a pair of spaced diaphragm members mounted to maintain a concave relation oppositely to'each other during movement together in opposite directions tocreate alternate pressure and suction influences in said chamber, said chamber having a conductive passage extending from the space between said diaphragms to a, point in the suction line at the intake side thereof and subject to the suction influences of said line for reducing pressure between said diaphragms.

7. In a pressure pump, inclusive of a suction line, a discharge line, and a pressure chamber, and the otherend of which terminatesin the 40 a closure for a side of said chamber comprising a pair of spaced diaphragm member mounted to maintain a concave relation oppositely to each controlling the flow of'fiuid through the intake,

and reciprocating mechanism for flexing said diaphragms.

3. A pump of the character described, comprising a housing having an intake and a discharge outlet distant therefrom; two flexible diaphragms supported in spaced relation in thehousing and ing; one end of which terminates at the intake .and the other end of which terminates in the other during movement together in opposite directions to create alternate pressureand suction influences in said chamber, said chamber havin suction-inducing means associated with said diaphragm members and constructed and arranged to act on matter in the space between said diaphragms and cause one saiddiaphragm to per-- form the lift and the other said diaphragm to perform the discharge of the pump. I

- maintain a concave relation oppositelyto' each space between the diaphragms, 'means, including a manually-operable valve positioned outside the housing, for admitting atmospheric air into the space between the diaphragmsin selective volume, a pressure-actuated valve for controlling the flow of fluidthrough the discharge outlet,'

' mechanism for flexing said diaphragms.

4'. A pump of the character described, compris- A ing a housing having an intake passage and a gas discharge outlet distant/therefrom,- two flexible diaphragms supported in spaced relation in the,

housing and defining with a wall of the housing a pressure chamber between the intake passage and the outlet, said diaphragms being in concave relation oppositely to each other throughout the stroke of the pump, there being a pressure-equalizing passage in' the housing 'one end of'which other during movement together in opposite directions to create alternate pressureand suction influences in said chamber, said chamber having means associated with said diaphragms constructed and arranged to control the pressure and suction influences'in the space between said diarections to create alternate pressure and suction influences in said chamber, and meansassociated with said pressure chamber for injecting liquid into and ejecting liquid from the space between the diaphragms to compensate for volud the other stroke and extreme-stroke positions.

metric changes occurring between their mid-' stroke and extreme-stroke positions. a

10. In a pressure pump, inclusive of a liquid suction line, a discharge line, and a pressure chamber, a closure for aside ofsaid chamber comprising a pair of spaced diaphragm'members mounted for movement together in alternate opposite directions to create alternate pressure and suction influences in said chamber,. and means associated with .said pressure chamber for injecting air into and ejecting air from the space between the diaphragms to compensate for volumetric changes occurring between their midfor volumetric changes occurring between their midstroke and extreme-stroke positions, and means separate. froms'aid injecting and ejecting means for continuously introducing air into the space between the diaphragm members.

7 which space between said diaphragms with said inlet 12. In a pump having an inlet passage and an outlet passage and a pumping chamber therebetween, a reciprocable'crosshead; a pair of flexible diaphragms connected with said crosshead and forming with said crosshead a movable wall of said chamber, said diaphragms forming a space therebetween and each? diaphragm being convex on the side nearest to the other diaphragm so as to extend a substantial distance toward the other diaphragm; and means connecting the passage.

I 13. In 'a pump having an inlet passage. and an outlet passage and a pumping chamber therebe tween, a reciprocable 'crosshead;' a p'airof fiexible diaphragms connected with said. crosshead and forming with said crosshead a movable wall of said chamber, said diaphragms forming a space therebetween .and each diaphragm being convex on the sidenearest to the other diaphragm so as to extend a substantial distance toward the n other diaphragm; means connecting the space v between said diaphragms with said inlet passage;

and means for reciprocating said crosshead alon a substantially straight line.

JOHN H. v;

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