US2392117A - Pump - Google Patents

Description

Jan. l, 1946. J. B. BuRKs 2,3927

PUMP

Filed July 3, 1944 2 Sheets-Sheet l Jan. 1, 194e. J. B. BURKS 2,392,117

PUMP

Filed July 3, 1944 2 Sheets-Shea?I 2 IIv @l0 O lh :i: `m *t =1 hx\ o NN N f g Il Il l 1| L J LJ' `m ung m Patented Jan. l, 1946 UNITED sTATEs PATENT OFFICE l James B Bulouston, Tex. Application July 3, llllll. 543,292

7 Claims.

This invention relates to a pump.

An object of the invention is to provide a pump specially adapted for pumping liquids.

The pump has been particularly designed for yuse as a slush pump for pumping gritty liquids such as drilling uid used in connection with well drilling. l

It is common practice to use a slush pump having one or more cylinders with pistons reciprocable therein for pumping the gritty drilling uid into wells in the process of Well drilling. This gritty fluid comes into contact with the cyl'- inder walls and the pistons with an abrasive eiect causing them to quickly wear and require replacements.

It is an object of the present invention to provide a pump of the character described wherein the fluid being pumped will not come into contact with the working parts of the pump to cause wear or abrasion thereof. Y*

Another object of the invention is to provide a pump having chambers formed with exible walls with an .eccentric mounted` between the chambers and rotatable to alternately reduce the volume of the chambers on compression stroke and permit expansion of the chambers on intake stroke whereby the liquid being pumped will be caused to flow by suction into the chambers a1- ternately and will be alternately forced therefrom, with-intake and exhaust valves for causing the advance of the pump liquid.

With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings wherein- Figure l shows a cross sectional view of the pump taken on the line l--I of Figure 2.

Figure 2 shows a longitudinal sectional View taken on the line 2-2 of Figure 1; and

Figure 3 shows a plan view of the pump.

Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the figures, the numeral I designates the pump casing which includes side plates 2, 3 secured to the sides thereof and which also includes the end plates 4, 5 secured to the ends thereof.

There is a drive shaft I6 extended longitudi nally through the pump casing and mounted in suitable roller bearings l, 8. This` shaft has a surrounding stuffing box assembly as 9 secured to one end of the pump casing and at lts other the pump casing. A preferred form of the eccentric comprises the eccentric disc I0 which is fixed on said shaft and surrounding this disc there may be a suitable bearing assembly which in the present instance is shown as being composed of the inner ring Il and the outer ring I2 with the bearings I3 between them.

On opposite sides of the eccentric and tted within the pump casing I, as shown in Figure 1, there are the cup shaped flexible diaphragms I6, I5 defining the walls of the chambers I6, il. The central portions of the plates 2 and 3 are extended inwardly tting within the margins of said diaphragms and surrounding the diaphragms and countersunk into the inner sides cf the plates 2 and 3 are the resilient gaskets I8 and I9 which form seals between the plates 2 and 3 and the central body of the pump casing and the margins of said diaphragms.

The chamber IB has the inlet opening 20 and the discharge opening 2I and the chamber Il has the inlet opening 22 and the discharge opening 23.

Mounted on the side plates 2 and 3 are the respective inlet valve assemblies 2B, 25 which include inwardly opening inlet valves as 26.

These inlet valve assemblies are connected to the intake pipe 21 which branches, as shown in Figure 3, the respective branches being connected to said assemblies. When used as a slush pump this intake pipe 21 leads to the slush pit and there is a corresponding discharge line whose branchesare connected to the discharge valve assemblies 28, 29 which include discharge valves as 30, all as shown in Figure 1. These discharge valve assemblies are connected into the discharge openings 2l, 23 and when used as a slush pump the discharge line leads to the well into which the slush, or drilling fluid, is being pumped.

The diaphragms I 4, I5 are supported by the upper and lower pairs of longitudinal swinging plates 3|, 3| and 32, 32 as shown in Figure 1 which limit the inward movement ofthe diaphragms. These plates are pivoted, at their outer ends, on the pins 33 whose ends are journaled in the respective end plates 4 and 5 and their inner margins ride against the surface of the ring I2 on opposite sides thereof. The upper and lower chambers 34 and 35, above and beneath the eccentric, respectively, are thus dened. Upper and lower channels 3B and 3i lead out from the chambers 3| and 3i and onout through the end plate I and are connected by the manifold 33.

The channel 33 leads on up through the pump casing I and is closed by the plug 39. A suitable liquid maybe introduced by removing said plug into the chambers 34 and 35 until said chambers and the channels and manifold are lled with this liquid. This is shown in Figure 1. This liquid, and the plates 3l, 32 prevent collapsing of the diaphragms inwardly and cause said diaphragms to move in unison.

Upon rotation of the eccentric I the chambers I6, Il will be alternately contracted and expanded -in an obvious manner. As a chamber is contracted, or reduced in volume, the liquid will be forced out through its exhaust port in the direction indicated by the arrow in Figure 1 and liquid will be drawn into the other chamber through its intake port as also shown by the arrow in Figure 1. When the other chamber is contracted, or reduced in volume, the liquid drawn into it will be forced out through its exhaust port as indicated by the arrow in Figure l. Thus while liquid is being drawn into one chamber it will be simultaneously discharged from the other chamber and vice versa so as to maintain an approximately uniform and constant flow of liquid through the pump. s

The main working parts of the pump, excepting the valves, will thus be shielded from the gritty fluid and the valves are readily accessible for replacement as they wear,

The drawings and description are illustrative merely, while the broad principle of the invention will be defined by the appended claims.

What I claim is:

1. A pump comprising a casing, cup-shaped, flexible diaphragms therein defining chambers, an eccentric between the diaphragms, means for rotating the eccentric to vary the capacity of the chambers, each chamber having an inlet and an outlet and' valves controlling the inlet and outlet.

2. A pump comprising a casing, sac-like flexible diaphragms therein which, with the opposing walls of the casing, deiining chambers, an eccentric between, and operative in contact with the diaphragms, means for rotating the eccentric to vary the capacity ofthe chambers, each chamber having an inlet and an outlet and valves controlling the inlet and outlet.

3. A pump comprising a casing having opposed chambers therein, exible diaphragms formed of elastic material and forming opposed walls of the chambers, said diaphragms being spaced apart. an eccentric between the diaphragms, means for rotating the eccentric to simultaneously move the ilexible walls in a corresponding direction whereby one chamber will be reduced in volume and the other chamber simultaneously enlarged in volume, each chamber having an inlet passageway and a discharge passageway withinlet and discharge valves controlling said respective passageways.

4. A pump comprising a casing having opposed chambers therein, flexible diaphragms which are countersunk into the casing around the chambers and spaced apart and which form walls of said chambers, an eccentric between said walls, means for rotating the eccentric to cause movement of the diaphragms to simultaneously decrease the volume. of one chamber and correspondingly increase the volume of the other chamber, each chamber having an inlet passageway l and an outlet passageway and inlet and outlet valves controlling said passageways.

5. A pump comprising a casing, flexible diaphragms therein spaced apart and defining opposed chambers, an eccentric between the diaphragms, means for rotating the eccentric to vary the capacity of said chambers, each chamber having a valve controlled inlet and a valve controlled outlet, oppositely arranged pairs of plates pivoted to the casing and having free margins in contact with the eccentric anddefining chambers on opposite sides of the eccentric, and liquid filling said last mentioned chambers.

6. A pump comprising a casing, substantially cup shaped diaphragms spaced apart therein and which, together with the opposing walls of the casing, form separate chambers, each chamber having an inlet and an outlet, an eccentric between the diaphragms, means for rotating the eccentric, inlet and outlet valves controlling the inlet and outlet of each chamber and means which co-act with the eccentric to limit the inward movement of the diaphragms.

'1. A pump comprising a casing having opposed chambers therein, flexible diaphragms which are countersunk into the casing walls around the chambers and which are spaced apart and which form walls of the chambers, an eccentric between the diaphragms, movable means formed of rigid material which cooperate with the eccentric to form rigid backings for the diaphragms, means for rotating the eccentric to cause movement of the diaphragms to simultaneously decrease the volume of one chamber and increase the volume of the other chamber, each chamber having an inlet passageway and an outlet passageway and an inlet and an outlet valve controlling said passageways.

JAMES B. BURKS.

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