US2299315A - Pump - Google Patents

Description

C. L. EVAN S Oct. 20, i942.

PUMP

3 Sheets-Sheet l Filed March 5, 1940 Oct. 20, 1942a "llllll snm" A TTORIVEYS.

Oct 20, 1942- c. EVANS 2,299,315

PUMP

Filed March 5, 1940 5 Sheets-Sheet 3 IN VEN TOR.

' l BY A TTORNEYS.

Patented Oct. 20, 1942 lUNITED STATES PATENTv -OFFICE PUMP Carroll Evans, Tipton, Calif.

Application March 5, 1940, Serial No. 322,393

3. Claims.

y after more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed. l

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings:

Figure 1 is a central vertical section through the upper portion of a pump embodying the present improvement.

Figure 1a is a similar view through the lower portion of the pump.

Figure 2 is a section on line 2 2, Figure la.

Figure 3 is a section on line 33, Figure la.

Figure 4 is a central vertical section through the upper portion of another form of pump.

Figure 4a is a similar view taken through the lower portion oi' said pump.

Figure 5 is a section on line 5-5, Figure 4a.

Figure 6 is a section on line 6 6, Figure 4a.

Figure 7 is a central vertical section through another modification of the pump.

Figure 8 is a section von line 8-8, Figure '7.

Figure 9 is a section through another form of pump having the present improvement.

Detachably connected to and extending upwardly from the connector 4 is another tubular stem I4 having a head I5 the upper portion of which is reduced in diameter to provide an annular shoulder I6 and this reduced portion is also formed with an annular groove I5. A valve in the form of a disc or ring I1 is slidably mounted on the stem I4 and is held normally pressed against the seat I8 formed'by the upper surface of connector 4 so as normally to close the upper ends of the port 9. A coiled spring I9 is mounted on stem I4 and thrust upwardly against head I5 and downwardly against the valve I1. Thus the valve is held yieldingly to its seat.

A plunger rod has been indicated at 20 and is mounted to reciprocate within connector 4, stems III and I4, and heads IIand I5. An annular shoulder 2| is provided on the rod 20 within cylinder I and constitutes an abutment for a plunger head 22 which is screwed onto the rod 20 and against the flange and is provided with an annular shoulder 23 and an annular groove 24.

'I'he space between head I5 and plunger head 20 is normally closed by a series of contacting washers 25 which are mounted for movement relative to the rod 20 surrounded thereby and these washers, which have rounded outer edges,

Referring to the gures by characters of reference I designates the upper pump cylinder having an interiorly screw-threaded lower end 2 which detachably engages the reduced threaded upper portion 3 oi' a connector 4. The lower portion of this connector is also reduced and screw-threaded as at 5 and is eng-aged by the lower cylinder 6 of the pump. The lower end of cylinder 6'is closed by a bottom cap 1 having a screw-threaded reduced portion 8 detachably seated in the cylinder. .f

Discharge ports 9 are extended through the connector 4 and extending downwardly from the connector between these ports is a tubular stem I0 provided with a stationary head II the lower portion of which is reduced in diameter to pro-v vide an annular shoulder I2. This reduced portion is also formed with an annular groove I3.

are in turn engaged by an elastic sleeve 26 which is molded about the washers and also about the reduced portions of the heads I5 and 20 so as to abut against the shoulders I 6 and 23 and iit within the grooves I1 and 24. The external diameter of the sleeve is less than the internal diameter of cylinder I in which it is located so that iluid is thus free to iiow upwardly within the cylinder and past the sleeve.

That portion of the rod 20 Within the lower cylinder 6 is provided at its lower end with a lower plunger head 21 having an annular shoulder 28 and an annular groove 29. This head is held to the rod 2II by means of a nut 30 or the like so that it will move with the rod. A series ot washers 3I is mounted loosely on the rod and normally fills the space between head 21 and head II. These washers, which have rounded edges, are surrounded by an elastic sleeve 32 which is molded on the washers and also around the heads 21 and II so as to iit snugly against the shoulders 28 and I2 and within the grooves 29 and I3.

The bottom cap 1 has an intake port 33 normally closed by a suction valve 34 which can be in the form of a ball held against displacement by a retaining ring 35 detachably engaging the cap and overlying a portion of the valve.

When the rod 26 is moved upwardly to the position shown in'Figures 1 and la the valve 34 is unseated so that fluid can ilow into the cylinder 6. When rod 29 is moved downwardly the liquid in the cylinder 6 is stopped against downward tlow therefrom and is displaced upwardly by the descending head 21. During this 'movement the sleeve 32 will stretch but the washers to which the sleeve is molded will act as spacers as they are moved apart, thereby preventing the sleeve from collapsing. At the same time the washers which have been held spaced by the upper sleeve 26 when the rod was moved upwardly. will move together. The descent of the plunger head 21 causes the displaced liquid to rise within the cylinder 6 and ilow upwardly through ports 9 into the upper cylinder L'this action causing valve I1 to unseat. As soon as the upward stroke is completed valve I1 will reseat so that the raised liquid will be trapped in cylinder I. Consequently when additional charges of liquid are subsequently forced successively into cylinder I, said cylinder will overilow and the liquid passed from the outletprovided at the upper end thereof.

For the purpose or protecting the elastic sleeve from abrasion and from the action of deteriorating fluid, the pump may be constructed as shown in Figures 4 to 6 inclusive. In this modiiied structuce the pump is made up of upper and lower cylinders 36 and 31 joined by connector 38 similar to connector 4 and provided also with a valve cap 39 at the bottom of the pump. In this modified structure a spring-pressed valve 49 normally closes ports 4| in the connector and the plunger 42 is slidable within a stem 42 extending upwardly from connector 38 and having a head 43. Another stem 44 is extended downwardly from the connector and has a head 45. i

Instead of mounting a single elastic sleeve on that portion of the rod within the upper cylinder 42, an upper plunger head 44 is secured to the rod and has one end of an elastic sleeve 45 molded therearound and also around an intermediate head 46 in which the rod 42 is slidably mounted. This intermediate head 46, in turn,

is securedto a stem 41 extending upwardly from a lower intermediate head 48 and an elastic sleeve 25a is molded at its upper end about the lower end of intermediate head 48 and, at its lower end about the head 43. Washers 49 are located within the respective sleeves and on the rod, these sleeves being molded about the washers in such a manner that the sleeves can expand and contract and at the same time be held against collapse by the washers.

For protecting the two sleeves in the cylinder 36 there are provided jackets 50 and 5| secured at their lower ends -to the heads 43 and 46 respectively. These jackets are placed around but are spaced from the respective elastic sleeves and project upwardly therebeyond, there being an inturned ilange 53 at the upper end of each jacket and constituting a ballle or retainer. Not only is each jacket spaced from the elastic sleeve therein but it is also spaced from the cylinder 36 and the area between the jacket and the elastic sleeve is adapted to be iilled with a heavy liquid indicated generally at 54. This liquid can partly fill the upper portion of the jacket as shown in Figure 4. v

That portion of the rod 42 within the lower cylinder 31 is similarly equipped with heads, sleeves and jackets. An elastic sleeve is molded about and extends downwardly 'from the head 45=l and is also molded about and joined to d injury to the elastic 2,299,315 Y y .l an upper intermediate head 56. A tubular stem 51 is connected to this head 56 and is provided at its lower end with a head 58. This head, in turn, is connected by an elastic sleeve 59, to the lower plunger head secured to the lower end of rod 42. Washers 6I are mounted .on the rod within the respective elastic sleeves and serve to mold such sleeves against collapse during the operation of the pump.

Jackets 62 are secured at their lower ends to the heads 60 and 56 respectively and extend around and are spaced from the elastic sleeves 59 and 55 respectively. They are also spaced from the cylinder 31 and project upwardly above the elastic sleeves where they are formed with inturned flanges or bames 63. The spaces between these jackets and the elastic sleeves are lled with heavy kfluid indicated at 64.

Obviously the pump shown in Figures 4 to 6 will function in the same manner asthe one shown in Figures 1 to 3 inclusive but it has the added advantage of providing a protecting jacket for each elastic sleeve, each jacket constituting a. container for a heavy protecting liquid whereby sleeves is prevented.

In the form shown in Figure 7 the pump includes a casing 65 having an intake cap or head 66 at its lower end. 'I'he pump rod 61 has a suitable valve casing 68 at its lower end provided with outlet ports 69 and with an intake 19. A valve 1| in this casing serves to close the intake ports during the up-stroke of the rod but to open it during the down stroke. To this valve casing is joined the upper end of a tubular plunger head l2. The lower end of this plunger head is reduced in diameter as at 13 and molded about it is the upper end of an elastic sleeve 14. This sleeve, which is spaced from casing 65, has its lower end molded about the reduced upper-portion of the head 66. Spacing washers 15 are surrounded by the elastic sleeve 14 which is molded therearound and these washers are superposed,

about a suction tube 16. This tube extends from the intake ports 11 of head 66 upwardly into the head 12 where it is provided with a check valve 18 having a retaining cap 19. Notches or recesses are formed at the centers of the washers 15, as shown particularly at in Figure 8V and these are adapted to be filled with heavy lluid indicated at 8|. I'his uid extends along the tube 16 and also within the space between the casing 65 and the sleeve 14. Obviously when the rod 61 is reclprocated, sleeve 14 will be alternately stretched and retracted. Each up stroke will set up a suction within the head 12 and each down stroke will result in upward displacement of the trapped fluid through the ports 69 and above the heavy fluid 82 which is located around the head 12 and between sleeve 14 and the casing 65. With a structure such as shown in Figure 7 the elastic sleeve is protected both on its inner and outer surfaces by the heavy fluid, the uiddl suppleinenting the washers 15 to resist collapse of the sleeve when stretched.

Another type of pump embodying the present improvement has been shown in Figure 9. In this structure a pump cylinder has been shown at 83 and has a valved intake port 84 and a valved outlet 85. 'I'he piston rod 86 is mounted for reciprocation in the cylinder and has a piston head 81 to which is molded one end of an elastic sleeve 88. The other end of the sleeve is molded to the cylinder head 89 and washers 90 are mounted on rod 86 and within the sleeve so as to hold the sleeve against collapse. This sleeve is surrounded by a protecting body of heavy fluid indicated at Il and this iluid can extend upwardly above the piston head 81 as shown.

What is claimed is:

1. In a pump the combination with a cylinder having a valved inlet and a valved outlet, of an expansible, sealed plunger in the cylinder comprising a rod mounted for reciprocation in the cylinder, a plunger head carried by the rod, an imperforate elastic sleeve secured at one end to the plunger head and anchored at its .other end to the cylinder, thereby to provide a sealed casing and a series of spacing washers movably engaging and centered by the rod and surrounded by and joined to the sleeve, said washers normally contacting and cooperating to lill the sleeve when in normal position. Y

2. In a pump the combination with a cylinder having a valved inlet and a valved outlet, of an extensible sealed plunger in the cylinder comprising a head, an imperforate elastic sleeve secured at one end to and closed by the head, the other end of the sleeve being closed and anchored to the cylinder,l a series of normally contacting Q spacing washers surrounded by and joined to the sleeve, said series being proportioned to normally fill the sleeve, a heavy protecting fluid extending around the sleeve and outside of the path of fluid when directed from the inlet to the outlet, and a rod secured to the head and slidable in the washers and the anchored end of the sleeve, said rod constituting means for holding the washers centered and alined and means to reciprocate the plunger.

3. A pump including a cylinder having a valved inlet at one end, a plunger rod, a plunger head on the rod and mounted to reciprocate therewith, a stationary head in the cylinder, a sealed elastic sleeve connecting said heads, and normally contacting relatively movable washers surrounded by and connectedto the sleeve, said washers normally iiiling the sleeve and being movabiy 'mounted on and centered by the rod.

CARROLL L. EVANS.

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