US2033210A - Pump - Google Patents

Description

March 10, 1936. A TENNANT E A 2,033,210

PUMP

Filed May 14, 1954 2 Sheets-Sheet 1 Joseph A. Tennant Herberi Allen BY gwmwmwm A TTORNEY.

INVENITORJ March 10, 1936. J, NT ETA], 2,033,216

PUMP Flled May 14, 1934 2 Sheets-Sheet 2 Joseph A.Tennani Herbert Allen I N V EN TORS.

A TTORNEY.

Patented at. m, 1936 JPAJTENTI creme rum Joseph A. Tennant and Herbert Allen, Houston,-

Tex, assignors, Stephens Pump by -mesne' assignments, to Company,

Round Rock, Tex

a corporation of Delaware J Application May 14, 1934, Serial No. ceases 12 Claims. (01. 103-44) This invention relates generally to pumps.

It will be found particularly useful in pumps designed for pumping abrasive and corrosive fluid of the general type disclosed by Letters Patent, of

the United States to Stephens No. 1,848,441 of March 8, 1932. A conventional pump of this type adapted for use as a mud or slush pump in deep well drilling includes a barrel; inlet and outlet valves thereforra hollow expansible member with- 1 in the barrel; and a reciprocable piston to actuate pumping fluid confined within the expansible member to cause expansion and contraction thereof whereby pumped fluid is drawn into and forced out of said barrel.

In pumps of other types the pumped fluid is in contact with the piston and rod and carries away the heat generated by the reciprocation of the piston and rod through conventional packings. In the type of pump to which this invention relates,

'20 however, the piston and rod are sealed off from the fluid being pumped and the heat so generated is therefore transferred to the pumping fiuid within the expansible member. These expansible members are usually made of rubber, which is a very good heat insulator, and the pumping fluid within the expansible member is in contact with very little metal. Under certain conditions, such as when the packings are inadvertently made 'too tight, the heat is not dissipated as rapidly as it is generated. And so, under such conditions,

the pumping fluid in the expansible member will reach a very high temperature whereby the expansible member will be injured; and .when the pressure on the pumping fluid is reduced on the suction stroke of the piston, the pumping fluid will boll so that the pumping member will remain expanded-which renders the pump-inoperative.

The present invention has for its general object the provision of new and improved means to pre-.-

vent heating of the pumping fluid to an objectionably high temperature.

A specific object of the, invention is the provision of means to cause the pumping fluid to be circulated by the piston through,a cooler.

The pumped fluidis in most instances at a low enough temperature to be used as'a cooling medium, and this invention has for another of its specific objects the utilization thereof as such, the heat of the pumping fluid being transferred by the 50' means provided to the pumped fluid.

Pumps of this type are adapted to pump fluid under very high pressures, and another specific object of the invention is to provide a cooler constructed and disposed in a new andimproved 55 manner so that the pressure diiferential across the tracted solid line shape '4;

shown) .of the outlet means -3 then fremains' closed, and the valve (not shown) of the'inlet walls thereof shall be very small, whereby said walls may be made sufilciently thin to permit the pumped fluid to readily cool the pumping fluid,

.without danger of failure and consequent leakage.

Other objects will hereinafter appear. The preferred embodiments of the invention are illustrated by the accompanying drawings,

wherein Fig. 1 is a sectional elevation of one of the barrelsof the pump equipped with the cooler; Fig. 2 is a fragmentary view illustrating the sleeve which may be added to the pump to assist in forcing the pumping fluid out ofthe e'xpansible meniber into the cooler; Fig. 3, a view,similar to Fig. 1

of another embodiment; and Fig. 4, a fragmen-v tary ,view taken at a right angle to Fig. 3.

As the operation of pumps of this type is clearlyset forth in the said 1,848,441, it will be but briefly referred to here as follows: v I a In the drawings the barrel is indicated .at 1,

t and the inlet and outlet means at 2 and 3, the .latter including valves not shown. Within the barrel l is a hollow expansible member 4 which may comprise a rubber sleeve having an internalannul'ar flange 5 secured to one end wall of the patent to Stephens, No.

barrel l by the ring 6; and an external annular flange l secured to the other end wall of the barrel I by a ring 8. The numeral 9 indicates the piston which is reciprocated by means not shown to actuate the pumping fluid within the expansible member 4 to draw the pumped fluid into the barrel I through the inlet means g and to expel it from the barrel I through the outlet means 3;. .When the piston 9 is at the end of its suction stroke as shown by the solidlines, the shape of the 'expansible member 4 is substantially cylindrical, and the barrel l is filled with pumped fluid. When the piston 9 moves to the right on its discharge stroke into its broken line position 9a in the expansible member 4, it displaces the pumping fluid in said expansible member, and causes said expansible member to expand into the shape indicated by thebroken -line in. During such expansion the inlet valve (not shown) of themeans. 2 remains closed, and the outlet valve -(not shown) of the means 3 opens to permit the pumped fluid to be expelled from the barrel I through the outlet means I. Now when the piston moves onits suction stroke from its broken'line position Qa-to its solid line position 9, the expansible'member contracts from its expanded broken line shape 4a into its conand as the valve (not .pose will form thesubject matter of, another application.

Referring now to the new and improved means I provided by this invention for the purposes above set forth, it will be noted that a pumping fluid III is disposed in the inlet means 2 in cooler the path of the pumped fluid passing through said inlet means into the barrel l, and that this cooler is connected by the pipe II andductl2 to one end of the expansible member 4; and by the pipe l3 and duct l4 to the other end of the expansible member 4. It will be seen that the ring 9 is provided with suitable ducts so that the fluid may pass from the duct l2 into the adjacent endofthe expansible member 4; and thatthe ring 6 has a central opening through which the fluid may passfrom the expansible member 4 into the duct l4, The. numeral l5 indicates a check valve in the pipe 19 opening in the direction indicated by the arrow.

Now as the piston moves from its solid line position 9 into its broken line position 90 on its discharge stroke, the pumping fluid in the expansible member 4 is agitated and a portion of it is forced ahead of the piston and through the duct l4, check valve l5, cooler l0, and then back through pipe H and duct l2 into the other end of the expansible member 4. And when the piston moves from its broken line position 9a. into its solid line position 9, on its suction stroke, the pumped fluid is drawn through the inlet means 2 into the barrel l. The pumping fluid is thereby subjected to the cooling 'action' of the the latter of which flows over the cooler III as it passes through the inlet means 2 into the barrel I. It will be understood that as the piston 9 reciprocates, the pumping fluid is made to circulate through the cooler l0, and is thereby kept cool by the pumped fluid.

Referring to Fig. 2, corresponding numerals indicate like parts, but the ring 8 has been omitted and in its place is a ring 6a. Integral with the ring to is wan inwardly presented sleeve l6; the internal diameter of which -is such that it snugly receives the piston 9 during the latter part of the pistons dischargestroke to assist in causing the .movement of the pumping fluid from the "expansible member 4 through the duct l4 and pipe i9 into the cooler. It will be understoodthaii in this figure the piston 9 is shown" near the end of its discharge stroke, and the expansible member in its expanded shape.

In Figs. 3 and 4' the elements correspond with the elements shown by Fig. 1, except that a different embodiment of the-cooler is provided. In

this embodiment the inlet means 2 includes an .elongated'port 2a extending substantially along the length of the barrel l to introduce the pumped fluid in a direction substantially tangential to the inner surface I! of the barrel; and the barrel is provided with a similarly elongated" pumping fluid passageway l8 communicating with one end of the expansible member 4 through the ducts I9 and 20 and check valve 2 I; and with the other 22 and the ducts in ring 9. As the pumped fluid exerts an outward pressure on the inner wall 23 of the passageway l9, and the pumping fluid exerts an inward pressure on said wall, and said pressures are substantially the same, the pressure differential across the said wall 23 is very small, and it may be made relatively thin to enable the pumped fluid to readily cool the pumping fluid without danger of failure and consequent leakage. The wall 23 is also directly in the path of ,the pumped fluidissuing at a high velocity from the inlet port 2a, so thahthe cooling action of the pumped fluid is most efliciently utilized.

This invention is not limited to the preferred embodiments herein disclosed. Various changes will occur to those skilled in the art, and may be made within the scope of the following claims.

We claim:

1. A pump having a barrel; inlet and outlet means for said barrel; a. hollow expansible pump ing member sealed insaid barrel; pumping fluid in said member; .a piston reciprochble in said member to efle'ctthe expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means, and, to expel it of said member; the inner wall of said passage- .way being disposed in the path of the pumped fluid entering said barrel through saidinlet port;

and a check valve between said cooler and that 0 end of said member toward which said piston moves on its discharge stroke; said piston serving to cause said pumping fluid to circulate thru said cooler. y v

2. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member sealed in said barrel; pumping fluid in said member; a piston reciprocable in said member to effect' the expansion and contraction of said member t6 draw pumped fluid into said barrel through said inlet means, and to expel it from said barrel through said outlet means; said inletmeans including an elongated port to introduce the pumped fluid in a direction substantially tangential to the.inner surface of said barrel; a pumping fluid cooler comprising an elongated pumping fluid passageway in the body of said barrel and communicating-with the opposite ends of said member; the inner wall of said passageway being disposed in the path of the pumped fluid entering said barrel through said inlet port; and a check valve to permit said fluid to circulate. thru said cooler in but one direction; said piston" serving tocause said pumping fluid to circulate thru said cooler in said direction. 4

3. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumpof said 'member; the inner wall of said passageway being disposed in the path of the" pumped rel through said inlet means, and to expel it from said barrel through said outlet means; and a pumping fluid cooler comprising a pumping fluid passageway in the body of said barrel and com- I municating with the opposite ends of said memher; the inner wall of said passageway being disposed in the path of the pumped fluid in said barrel.

- 5. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pump.-

ing member sealed in said barrel; pumping fluid in said member; a piston reciprocable in said member to effect the expansion and contraction of said member to draw pumped fluid into said barrel throughsaid inlet means and to expel it from said barrel through said outlet means; a pumping fluid cooler in the path of the pumped fluid adjacent said inlet and communicating with opposite ends of said expansible member, and a check valve to permit the circulation of said pumping fluid thru said cooler in but one direction;' said piston serving to cause said pumping fluid to circulate thru said cooler.

6. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member sealed in said barrel; pumping fluid in said member; a piston reciprocable in said member to effect the expansion and contraction of said member to draw pumpedfluid into said barrel through said inlet means and to expel it from said barrel through said outlet means; and.

a pumping fluid cooler in the path of the pumped fluid and communicating with opposite ends of said expansible member; said piston serving to cause said pumping fluid to circulate thru said cooler.

7. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member sealed in said barrel; pumping fluid in said member; a piston reciprocable in said 1:: to efiect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means and to expel it from said barrel through said outlet means; and a pumping fluid cooler communicating. with said expansible member; said piston serving'to cause said pumping fluid to circulate thru said cooler. 8. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member supported by and sealed in said barrel; pumping fluid in said membefiuneansto actuate" said pumping fluid to eflect theexpansion and contraction of said member to\draw pumped fluid into said barrel thru said inlet means and to expel it from said barrel thru said outlet means; and apumping fluid cooler and closed means for conducting said pumping fluid f from said member to said coolerand back again.

9. A pump having a barrel; inlet and outlet means for said barrel; a hollow expansible pumping member sealed in said barrel; pumping fluid in said member; a piston reciprocable in said member to effect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means and to expel it from said barrel through said outlet means; a

pumping fluid cooler communicating with said expansible member; said piston serving to cause said pumpingfluid to circulate thru said cooler; and a sleeve constructed and arranged for the snug reception of said piston" during the latter part of its discharge stroke to assist in causing the movement of said pumping fluid into said cooler.

10. A pump having a barrel, inlet and outlet means for said barrel, a hollow expansible pumping member supported by and sealed in said bar.- rel, Dumping fluid in said member, means to actuate said pumping fluid to eifect the expansion and contraction of said member to draw pumped fluid into said barrel through said inlet means, and to expel it from said barrel through said outlet means, and pumping fluid cooling means connected to the opposite ends of said expansible member including a heat-transferring portion located'adjacent said inlet means.

11. A pump having a barrel, a hollow expansible pumping member supported by and sealed in said barrel, pumping fluid in said member, means to actuate said pumping fluid to effect the expansion and contraction of said member to draw pumped fluid into and to expel it from said barrel, a cooler in the path of the pumped fluid, and means for circulating the pumping fluid from 'said member through said cooler and back into said member;

12. A pump having-a barrel, a hollow expansible pumping member supported by and sealed in said barrel, pumping fluid in said member, means to actuate said pumping fluid to efl'ect the expansion and contraction of said member to draw pumped fluid into and to expel it from said barrel, and means for circulating the pumping fluid from said member through the pumped fluid and back into said member.

JOSEPH A. "rENNAN'r. HERBERT ALLEN.

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