US2606500A - Fluid actuated double-acting submersible pump - Google Patents

Description

Aug. 12, 1952 B. F. SCHMIDT FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 13 Sheets-Sheet 2 .w 7 .M 4 3 2 8 6 a MH 7 7 7 0/ 9 6 TC u WW .1| I||. ,A I.. M illllilll/ M x l gw. [IL ,v w W L.. W I/lll-: 2 J7 2 A0 5 4 ly au. 6 a a u n 5 70 n n am 0 0 4 7 f 9 a .n 5 y Q0. a ,i Q. Q x gmk K K X Ar Ton/vn Aug. 12, 1952 B F. SCHMIDT 2,505,500

#r MERSI D Filed June 24, 1946 13 Sheets-Sheet 3 www" INI/ENTOR. BENJAMIN E SCHMIDT Aug. 12, 1952 B. F. SCHMIDT 2,606,500

FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 194e 13 sheets-sheet 4 Aug. 12, 1952 B. F. SCHMIDT 2,606,500

FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 15 Shees-Sheet 5 'f' IN V EN TOR.

` BENJAM/N F'. SCHMIDT BY MJ] A TTOR/VE Y Aug. 12, 41952 B. F. SCHMIDT FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed Jne 24, 1946 13 Sheets-Sheet 6 6 VNTOR.

BENJAM//v scHM/DT 5^' 50 ATTORNEY Aug. 12, 1952 B. F. SCHMIDT 2,605,500

FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946k 13 Sheets-Sheet 7 9/ A BENJAMIN F SCHMIDT B. F. SCHMIDT Aug. 12, 1952 2,606,500

` FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP 15 Sheets-snee?l 8 Filed June 24, 1946 INI 'EN TOR. BENvMM/N F. SCHM/DT ATTORNEY Aug. l2, 1952 FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 B. F. SCHMIDT 2,606,500

13 Sheets-Sheet 9 INI/ENTOR.

BEM/AMW F, SCHH/0T ,4T TOR/ver Aug. 12, 1952 B. F. SCHMIDT l FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 194e 13 Sheets-Sheet lO :fi/l...

j INVENTOR. BENJAMIN F. SCHMIDT ATTORNEY Aug. 12, 1952 B. F. SCHMIDT .2,606,500

r FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 13 Sheets-Sheet 11 INVENTOR. BENJAMIN E SHM/DT Arf-@Riek Aug. 12, 1952 B. F. SCHMIDT FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 13 Sheets-Sheet l2 INVENTOR. BENJAM/N l". SCHH/D7' Aug. 12, 1952 FLUID Filed June 24, 1946 B. F. SCHMIDT 2,606,500

ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP y 15 Sheets-Sheet 13 .'INVENTOR.

BENJAMIN E SCHM/DT ATTORNEY Patented Aug. 12, 1952 FLUID ACTUATED poulains norme` sUBMnRsIBLi; BUMP Benjamin F. Schmidt, Los Angeles, Calif'. Application June 24, 1946, Serial No. 678,741

(C1. S-i5) 3,7 Claims.

M-y inventionr relates in general to power operated pumps, and relates in particular to a pump f or pumping fluids from deep Wells, this pump having a novel pumping mechanism and motor therefor combined in a single unit which is submerged in the liquid in the Well.

It is an object of the invention to provide a positively acting displacement pump which avoids the use of sucker rods such as commonly extended from plunger pumps, to the top of the well and avoids the use oi pistons and cylinders in contact with the liquid which is being pumped from the well, In this respect the invention, in avoiding the exposure of f rictionally engageable parts to the pumped liquid which generally carries sand or other abrasives, achieves a greatly extended useful life of the operating parts o1 the pumping mechanism, thereby making it possible to use the pump for long periods of time before necessity of pulling the pump from the well for adjustment or part replacement is required.

It is an object of the invention to `provide a deep well pump wherein the pumping force or power is transmitted from the power source of the pumping device to the movable walls of the device which contact the ordinarily contaminated liquid being pumped by means of a clean liquid, such as thin highly reiined oil, this oil lubricating the moving parts of the device and thereby protecting the same against rapid Wear. Accordingly, the internal operating parts of the device which move in frictional engagement, one with the other,l are maintained in a bath of oil, protected from wear producing substances.

A further object of the invention is to provide a deep Well pump having one or more pumping chambers which receive the liquid to be pumped through inlet valves, these pumping chambers Vhaving therein bellows or bladder elements which,

upon expansionA by the application of internal fluid pressure thereto, force the liquid through discharge valves into passages which lead to the top of the well. p A

An object of the invention. is i@ prei/161.6111 a Pump having pumping Chambers inlet and discharge valves so arranged that the presence of sand in the pumped liquid will have a minimum Wearing effect on the valve parte, In this pumping device both the inlet and outlet valves of the pumping chamber are arranged at the lower end of the pumping` chamber so that sand or other abrasive substances which are carried into the pumping chambers will be immediately ref moved therefrom and therefore will not be per-,

2 mitted to accumulate by sedimentation in the bottom of the pumpingr chambers.

An important object of the invention is to provide a pumping mechanism of the character described having a motor driven pump for pumping the operating fluid and means for directing this operating huid into the expansile contractile members which are disposed in the crude oil pumping chambers oi the device, whereby these expansile-contractile members will be expanded in timed relation so as to pump a substantially continuous iiow of oil through the outlet passage of the device.

A further object oi the invention is to provide a pump of the character described in the preceding paragraph, wherein the motor driven pump operates continuously to pump the operating liquid, for example, oil, there being means for progressively or alternately connecting the outlet of the motor driven pump with the expansilecontractile members, and it is a further object to provide a valve means which Will connect the 4outlet of the motor driven pump with one ofthe expansile-contractile members and at the same time connect the inlet of the pump with the other of the eXpansile-contractile members, so that the rst of the eXpansile-contractile members will be subjected to fluid pressure from the pump and the other of the eXpansile-contractile members will be connected to suction, the aforesaid valve means being reversed in timed relation so that the expansile-contractile members will be alternately expanded and contracted and the pumped liquid will be alternately drawn into the pumping chambers while at the same time, pumped liquid is being discharged alternately from the pumpingchambers.

A further object is to provide a pump of'tl'ie character set forth in the preceding paragraphs having for operation of the valve which controls the flow of the operating iluid, a timing means which is operated by the movement, of the operating fluid, and` a further object is to provide a means having the Characteristics of a meter through which the operating iiuid passes, this meter measuringthe flow of operating fluid and reversing the position of the control valve when required quantities of the operating flow have passed through the: metering device.

Further QbisQiS'Qf the invention include a novel and effective means for, connecting the upper end of thepumpin'g deviceV to a string of tubing through which the Dumped liquid is. Carried to the topoi the well and, for connecting electrical cables/,to` the upper end oi the pumping device, whereby the motor or motors of the device may be energized; means for maintaining the motors and other internal operating parts of the device in a bath of clean oil; a compact and effective pump for pumping the operating fluid; a novel four-way valve for controlling the delivery of the operating fluid into the expansile-contractile members and for connecting these members with the inlet of the operating fluid pump; a simple and effective means whereby the movement of the operating parts of the metering device are translated into controlling movements and effects whereby the operating liquid control valve is actuated; a cooperation of simple and compact parts whereby the power and pumping mechanisms are embodied in an elongated slender structure which may be lowered into a well of relatively small diameter; a simple arrangement of pumping chambers at the lower end of this structure; and simple and durable expansile-contractile bellows or bladder elements operative in the pumping chambers.

A further object of the invention is to provide in a pump of this character a control for the pumping action which responds to pressures in the eXpansile-contractile bellows. In this alternative control for the pump, pilot valves are provided which respond to excess pressures built up in the bellows or bladder elements.

Further objects and advantages of the invention will be brought out in the following part of the specification.

Referring to the drawings, which are for illustrative purposes only:

Fig. 1 is a partly sectioned elevational view showing a preferred embodiment of my pump;

Fig. 1a is a diagrammatic drawing of the pumping device shown in Fig. 1;

Fig. 2 is a fragmentary sectional view of the portion 2 of Fig. 1;

Fig. 2a is a cross section, to enlarged scale, taken as indicated by the line af-a of Fig. 2;

Fig. 3 is a fragmentary elevational sectional View of the portion 3 of Fig. 1;

Fig. 4 is a fragmentary elevational sectional view of the portion 4 of Fig. 1;

Fig. 5 is a fragmentary elevational sectional view of the portion 5 of Fig. 1;

Fig. 5a. is a view looking upward from the plane a-a of Fig. 5;

Fig. 5b is a fragmentary side view of a frame at the upper end of the piston and associated parts.

Fig. 6 is an enlarged sectional view of the portion 6 of Fig. 1, the upper half of Fig. 6 being sectioned substantially as indicated by the line 6 6 of Fig. 6a and the lower portion thereof being sectioned substantially on the transverse center line of Fig. 6b;

Fig. 6a is a sectional view taken as indicated by the line ct-a of Fig. 6;

Fig. 6b is an enlarged sectional view taken as indicated by the line b-b of Fig. 6;

Fig. 7 is an enlarged sectional view of the portion 1 of Fig. 1, the middle and lower parts of this ligure being sectioned as indicated by the lines 'I-T of Figs. 7b and 7c;

Fig. 7a is an enlarged cross section taken as indicated by the line -a of Fig. 7 n l Fig. '7b is a cross section, to enlarged scale, as indicated by the line b-b of Fig. 7;

Fig. '7c is an enlarged cross section taken as indicated by the line c-c of Fig. 7;

Fig. 7d is a plan view of the oscillating plate, a partial plan of which is shown in Figure 7a.

Fig. 8 is an enlarged fragmentary section of the portion 8 of Fig. 8, the lower part of Fig. 8 being sectioned as indicated by the line 8-8 of Fig. 8b

Fig. 8a is an enlarged sectional view taken as indicated by the line a-a of Fig. 8;

Fig. 8b is an enlarged cross sectional view taken. as indicated by the line b-b of Fig. 8;

Fig. 8c is an enlarged fragmentary sectional view taken as indicated by the line c-c of Fig. 8,y to show the upper ends of the connector mem-- bers;

Fig. 8d is an enlarged fragmentary sectional view taken as indicated by the line d--d of Fig. 8c;

Fig. 8e is a perspective view of a connector with its tube clamping body or plug;

Fig. 9 is an enlarged fragmentary sectional View of the portion 9 of Fig. 1, the upper portion in the region of the line a-a of this gure being sectioned as indicated by the line 9-9 of Fig. 9a, the portion of this figure below the line b-b being sectioned as indicated by the line 9 9 of Fig. 9b, and the portion of this figure below the line c-c being sectioned as indicated by the line 9-9 of Fig. 9c;

Fig. 9a is a cross sectional view taken as indicated by the line a-a of Fig. 9;

Fig. 9b is an enlarged cross section taken as indicated by the line b-b of Fig. 9;

Fig. 9c is an enlarged cross Section taken as indicated by the line c-c of Fig. 9;

Fig. 9d is an enlarged fragmentary sectional view taken as indicated by the line d-d of Fig. 9;

Fig. 9e is a perspective View of a lower connector or closure for a tube, and the tube clamping plug therefor;

Fig. 10 is an enlarged fragmentary schematic sectional view taken as indicated by the line III-ID of Fig. 7a;

Fig. 10a is a fragmentary sectional view taken as indicated by the line a-a of Fig. 10;

Fig. 11 is an enlarged fragmentary schematic sectional view showing the duct arrangement at the upper end of the valve chamber of the device;

Fig. 12 is an enlarged fragmentary schematic sectional View showing the duct arrangement at the lower end of the valve chamber;

Fig. 13 is a longitudinal section through a preferred form of flexible pumping member, intermediately shortened so that both of the pumping member can be shown in the single view;

Fig. 13a is a cross section taken as indicated by the line a-a of Fig. 13;

Fig. 13b is a cross section taken as indicated by the line b-b of Fig. 13;

Fig. 13c is a cross section taken as indicated by the line c-c of Fig. 13;

Fig. 13d is a cross section taken as indicated by the line d-d of Fig. 13

Fig. 14 is a longitudinal section through an alternative form of a liexible member;

Fig. 15 is a schematic view showing my pump with the alternative pressure-responsive control which may be employed in substitution for the metering device previously shown.

The pumping device shown in Fig. 1 is of vertically elongated form so that it may be lowered into a well by means of tubing I0 which has also the purpose of conveying the pumped duid-for example, oil-to the top of the well. The pumping device includesl an outer shell II which is connected to the tubing I0 by a tting I2. The vertically elongated tubular shell II contains therein the power section I3 and the control section I4 of the pumping device, these sections I3 and I4 being contained in connected inner tubular shells I5, I5a and I6 of such diameter as to leave an annular space or passage I1, through which the pumped fluid may pass from the upper end of the pumping section I8 of the device to the fitting I2 and then into the lower end of the tubing III.

The power section I3 has in the upper end thereof electrically driven motor means represented by a motor I9 which may be employed singly or in multiplicate, depending upon the power required. The power section also includes a pump 20 for operating iluid, this pump 20 having a pressure outlet 2| and a suction inlet 22. From the outlet 2l a pressure passage 23 leads downwardly into the control section of the pumping device and a suction or return passage 24 leads downward from the suction inlet 22.

In the control section I 4 of the pumping device there is a meter 24 which is connected in series with the pressure passage 23, and a control valve 25 comprises a cylinder 26 in which a piston 21 is vertically slidable. The lower end of the pressure passage 23 connects with the cylinder 26 through spaced ports 28 and 29, and above the ports 28 and 29 ports 30 and 30 connect the lower end of the suction passage 24 with the cylinder 26.

The vertically elongated pumping section of the device has pumping chambers 3l and 32 in side by side relation, in which expansile- contractile members 33 and 34 are operative. Each of the chambers 3| and 32 has an inlet valve 35 and a discharge valve 36. The discharge valves 3S communicate with a rising passage 31 which connects with the lower end of the passage I1 of the control and power sections of the pumping device. An operating fluid passage 38 extends upward from the eXpansile-contractile member 33 and is connected to the space within the cylinder 26 by ports 39 and 40, which are respectively in the horizontal planes of the ports 28 and SI. An operating fluid passage 4I extends upwardly from the expansile-contractile member 34 and is connected to the space within the cylinder 26 by ports 42 and 43 respectively in the horizontal planes of the ports 29 and 30. The valve piston 21 has therein annular channels or ducts 44 and 45 spaced so that when the piston 21 is in the lowered position in which it is shown in Fig. la, the channel 44 will connect the pressure passage 23 with the operating fluid passage 38 through the ducts 28 and 39, and the channel 45 will connect the operating lluid duct 4I with the suction passage 24 through the ports 43 and 30. At this time, operating fluid under pressure will pass into the expansile-contractile member 33 through the passage 38 and operating lluid will pass out of the member 34 through the passages 4I and 24 to the inlet of the pump 20 which will deliver such fluid into the upper end of the pressure passage 23 until this cycle of operation is completed under control of the meter 24 which is capable, when a measured quantity of operating fluid has passed into the expansile-contractile member 33, of actuating the control valve 25 so as to reverse the ilows of operating fluid through the passages 38 and 4I. For operation of the valve 25, I provide means for hydraulically shifting the valve piston 21 from one of its positions to the other positively and rapidly.

The valve cylinder 26 provides at the ends of the piston 21 chambers 46 and 41 which are connected to the pressure passage 23 through orifices 48 and 49 so that When these chambers 46 and 41 are closed against escape of iluid therethe piston 21 will be balanced. At the lower endv of the chamber 46 there is a pressure release port 50 which is connected through a pressure release passage 5I with a port 52 of a pilot valve 53 having a valve body 54 which is rotated bythe meter 24' as will be hereinafter explained. At the upper end of the chamber 41 there is a pressure release port 55 which is connected through a pressure release passage 56 withfa port 51 of the pilot valve 53. a transverse passage or port 58 which communicates through vertical passages59 with a chamber 60, Fig. 10, at the lower end of the valve body 54, this chamber 69 being connected through a passage 6I with the pressure return passage 24. At the ends of the valve piston 21 there are closures 62 and 63y adapted to respectively close the pressure release ports 50 and 55 when the valve piston 21 reaches the end of its intended travel. In Fig. 1a the closure 62 is in a position to close the pressure `release port 50 so that even though the pressure release passage 5I is connected through the pilot valve 53 and the passage 6I with the return passage 24, ilow ofV fluid from the chamber .46

cannot occur. y

When the action of the meter24' rotates the plug 54 of the valve 53 so as to bring the port 58 into conjunction with the port 51, the pressure release passage 56 of the upper chamber 41 of the valve device 25 will be connected to the suction passage 24, and at the same time the valve plug 54 will close off the pressure release passage 5I of the lower chamber 46 of the valve device 25. The capacity of the `pressure release passages 5I and 56 is made purposely greater than that of the orifice 49, so that when the operation of the valve device 53 opens the passages 5I and 56 in their proper order,V the valve piston 21 will be shifted as a result of hydraulic differential pressure against the ends thereof. For example, with the valve piston 21 `in` the lowered position in which it is shown in Fig. la, the opening of the pressure release passage 56 will result in an outflow of iluid from the chamber 41 at a rate greater than the inilow of fluid through the orifice 48, there being then aY reduction in pressure in the chamber 41 so that iluid which enters the lower chamber 46 under pressure from the orice 49 acts against the lower end of the Valve piston 21 to shift it upwardly, this upward shifting movement of the piston 21 continuing until the closure 63 closes the pressure release port 55, thereby stopping the escape of fluid from the chamber 41. When the valve piston 21 reaches its raised position, the ilow of operating iluid in the passages 38 and 4I will reverse. The channel 44 of the piston 21 will then connect the pressure passage 23 with the passage 4I through the ports 29 and 42 so that iluid under pressure will be fed into the expansile-contractile member 34, and the channel 45 of the piston 21 will connect the passage 38 with the return or suction passage 24 through the ports 40-and 3| so that the expansile-contractile member 33 may collapse. The reversal of the cycle described in the foregoing will occur intermittently under control of the meter, so that the members 33 and 34 will be consecutively and alternately expanded and collapsed, thereby performing alternate pumping actions in the pumping chambers 3l and 32, resulting in a substantially constant flow of pumped iluid upward through the passage I1 into tinto the passage 5I The bodyv 54 of the valve 53 has the delivery tubing I which extends to the surface of the ground.

As shown in Fig. 2, the fitting I2, which is connected to the upper en d of the outer shell II, has therein a pumped iiuid passage 64 having internal threads 65 to receive the threaded lower end of the tubing I0. This passage 64 communicates with the space 66, Fig. 3, in the upper end of the shell I I, which space 6'6 constitutes a continuation of the pumped oil passage |1. The fitting |2 has also therein a passage 61 through which a cable conduit 68 passes into the upper end of the outer shell as shown in Fig. 3. This cable conduit comprises a metal tube 69 through which electrical conductors 10 extend, these conductors 10 being embedded in a body of rubber 1| which is secured in place so as to ll the interior of the tube 69 and thereby provide a. seal to prevent entry of fluid into operative parts of the device through the cable conduit 68. At the upper end of the lcable conduit 68 there is a cable connector body 12 adapted to be connected to a cable connector member 13 which is disposed at the lower end of a cable 14 which extends from a source of power at the top of the well for the purpose of supplying electrical energy to the motor I9 of the pumping device. To provide space for the connectors 12 and 13, the tubing I0 is locally flattened as shown in Fig. 2.

As shown in Fig .3, a plug 15 is provided at the upper end of the outer shell I I for connection of the fitting |2, this plug being threaded into the upper end of the shell II and having therein openings 16 which connect the bifurcated lower end of the passage 64 with the space 66. The plug 15 has also an opening 11 through which the cable conduit 68 passes, there being packing means 18 in the opening 11 for sealing around the cable conduit 68. As further shown in Fig. 3, the cable conduit 68 is carried through a clamping and packing device 19, disposed at the upper end of a cylindrical cage 80, to a multiple electrical connector 8| which is carried in the connector tting 82, Fig. 4, by which the cage 80 is connected to the upper end of the shell I having therein the motor I9 which is of slender vertically elongated form and may be employed in multiplicate. The cage 80 consists of a section of metal tubing having openings 83 therein, through which the pressure of iiuid in the space or passage I1 may be transmitted to the space 84 surrounding the pressure balancer which is disposed within the cage 80. This pressure balancer 85 consists of a tubular wall of flexible material supported so that the intermediate portion thereof may ilex and thereby act as a barrier between a body of protective oil occupying the interior of the pressure balancer and the pressure of fluid in the annular pasage I1 surrounding the power and control sections |3 and |4 of the device, the internal space 86 of the pressure balancer 85 communicating through a passage 8S in the tting 82 with the interior of the motor shell I5 which in turn communicates with the interior of the shell I6 of the control section as will be hereinafter described.

The ends of the tubular pressure balancer 85 are closed by upper and lower cups 89 and 90 which surround the cable conduit 68 at spaced points within the cage 80, these cups 89 and 90 having internally tapered side walls 9| to receive the ends of the tubular pressure balancer 85 so that these ends of the member 85 may be clamped against the walls 9| by clamping bodies 92 which are externally taperedto correspond to the taper of the walls 9| of the cups 89 and 90 and are pulled into the cups 89 and 90 by use of screws 93 and 94. The clamping bodies 92 are of annular form so that they may surround the conduit 68. Also the lower cup is secured to the upper face of the fitting 82 and has therein a portion of the intercommunicating passage 80, through which fluid pressure may be transmitted between the space 86 within the pressure balancer 85 and the interior of the motor shell l5.

As shown in Fig. 4, the motor shell I5 has at its upper end a ring fitting 95 which serves as a means for the attachment 96 to support the upper end of the shaft 91 which carries the rotor 98 of the motor |9 which is of slender form so that it will operate within the motor eld 99. Electrical connections between the conductors 10 of the conduit 68 and the motor I9 are schematically shown at |00.

At the lower end of the motor shell I5 there is a tting |0| as shown in Fig. 4, having therein a bearing |02 to support the lower end of the motor shaft 91. This fitting I0| is secured to the upper face of a concentric bearing support |02 which is of tubular form and extends downwardly within the pump shell |5a to the upper end of which it is connected. As shown in Fig. 5, a rugged radial bearing |03 is supported in the lower end of the bearing support |02', to carry the lower` end of a shaft |04 which projects upwardly from the annular body |05 of an eccentric or crank member |06. As shown in Fig. 4, the upper end of the shaft |04 is supported by a bearing |01 and is connected to the downwardly projecting end |08 of the motor shaft 91 by a sleeve coupling |09 so that the eccentric |06 will be driven by the motor.

In the lower face of the body |05 there is a circular recess I I0 to receive an adjustable eccentric disc having an eccentric opening I|2 which receives a bearing block I3. The disc I may be rotated in the recess I0 and may be held in its various positions of adjustment by a screw ||4 which is threaded into an opening ||5 in the body |05.

As shown in Fig. 5a, the disc l I has a plurality of peripheral channels H6, any of which channels H6 may be brought into conjunction with the body of the screw ||4 by rotation of the disc in the recess ||0, thereby changing the distance of the bearing block ||3 from the axis of rotation of the body |05.

A body ||1 is secured in the lower end of the shell member I5a. On the upper face of the body II 1 there is a valve body IIS superseded by a valve plate |9 against which a pump body |20 is positioned. This pump body |20 has near the periphery thereof a plurality of cylinder bores |2| which are parallel to the vertical axis of the body |20. Each of the cylinder bores |2| receives a piston |22 which projects above the upper face of the body |20. Each piston |22 has thereon a rectangular frame |23 to receive a divided cross head block |24 having a spherical opening |25 between its component parts to receive a spherical actuating lever |26 which projects laterally from the lower end of an operating arm |21. The operating arm |21 is supported on a ball |28 formed on a pin |29 which is secured in the pump body |20.

'Ihe operating arm |21 consists of a body 30 of generally cylindrical form, which body has the lever |26 projecting therefrom.` This body |30 has a spheroidal cavity |3| to receive the lower half of the ball |28 4and an upwardlyexteding threaded opening |32 to receive the lower threaded end of a stem portion |33 which converges upwardly and has thereon a ball |34 which is received by the bearing block I3, so that when the eccentric member |06 is rotated, the upper end of the operating arm |21 will describe a circle andv'circumduction of the arm |21- around `the center of the ball |28 will be accomplished. This circumduction or rocking movement of the arm |21 results in a vertical reciprocation of the levers |26 which Vertical reciprocation is transmitted through the cross head blocks |24 to the pistons |22. The stem' |33 has a spheroidal seat |35 toengage -theu'pper face ofthe ball |28, and a lock nut |36 is provided on the stem |33 for locking the stem |33 inthe body |30 when lthese parts have been adjusted into proper relation to the ball |28. Stems |31 project upwardly from the rectangular frames |23 ofthe pistons |22 and are guided in openings |38 in a guide ring |39.

Adjacent the lower end of each cylinder bore |2| there is a valve cavity |39 drilled upwardly into the pump -body |20, the lower endof this valve cavity |39 communicating with the lower end of the adjacent cylinderbore |2 through an opening. |40; The plate 9 has a port|4| communicating with the lower end of the valve cavity |39 and an inlet valve closure in the form'of a spring-pressed ball |42 and is seated in the upper end of the port |4|.Also, the. plate ||9 has in communicationwith thelower end of each cylinder bore |2| a discharge valve port |43, the lower endof whichisadapted to be closed by a discharge check valve closure consisting of a springpressed vball |44 disposed in .a valve cavity |45 in the upperspace of the valve body IIB. Each of the cavities l|45 communicates with a discharge passage 23a inthe valve body ||8 which comprises the upper extremity of the pressure passage 23 described with relation to Fig. la. It will be understood that inthe following description the openings or passages in the various parts which form a part of the pressure passage 23 willbe identiiied by the numeral 23 and a conjoined letter. The body ||1 at the lower end of the shell |511 has passages 23h therethrough which' connect the passages 23al with a recess |46 in the lower face of the body ||1this recess |46 communicatingwith a pressure passage section 23e in a connector body |41 which extends upwardly into the recess |46. As shown in Fig. 5, portions or sections 24a, 24h, and 24o are formed respectively in the valve body |6, the body I] and the connector body |41.

|I8 communicates with the lower end of the inlet or suction valve port |4| in the plate |-|9. .In the body 1 a' port |46V connects the section 23h of the pressure passage23' with the section 23h of the suction passage 24, anda pressuregrelease valve |49 isl extended `across the passage 24b and is urged intoclosing relation to the port |48 by a spring |50, the strength of which' will determine the pressure differential between the `passages 23h and 24bat which the pressure release valve |49 will open and permit release of pressure from the passage 23b throughthe port |48. The inner tubular shell |6, as shown in the lower part of Fig. 5, threads onto the body ||1 and projects downwardly around the connector body |41, around the meter shownin Fig. 6, around the valve mechanism shown inrlig. 1, and ends in the lower part of the control sectionV of the device as shown in Fig. 8.

The passage 24a in the body The meter 24' comprises a body 5i of cylindric form having a cylindric bore from end to end thereof to provide a chamber |52 in which a vaned rotor |53 operates in eccentric position characteristic of vane type pumps 01' m0130135- The upper end of the chamber |52 is closed by a head |54 which is connected to the lower face of the connector body |41 and has therein continuations of the pressure and suction passages 23 and 24 speciically identified by the numerals 23d and 24d.

As shown in Figs. 6 and 6a, the passage 23d slopes downwardly and forwardly to a port |55 constituting the uid inlet of the meter 24. The passage 24d connects with the upper end of a return ypassage portion'24e which extends vertically through the side wall of the meter zbody |5|. The lower end of the meter chamber |52 is closed by a head |'56 having in its upper face an outlet port for the meter chamber |52, this outlet port |51 being disposed at the upper end of a pressure passage section 23e which slopes downwardly and rightwardly within the head |56. The head |56 has also therein a suction passage section 24j, the upper end of which connects with the lower end of the passage section 24e.

The rotor |53 has an upwardly projecting stub shaft |58 which is received by a sleeve bearing |59 carried in the upper head |54. A shaft |60 projects downwardly from the meter rotor |53 through a lbearing |6| carried by the lower head |56. v

As shown in Fig. 7, the shaft |60 projects down through the head |56 and through a bearing |62 carried by a body member |63 which is connected to the lower face of the head |56. The shaft |60 has an eccentric pin |64 on its lower end which engages a bearing |65 mounted on the leftward end of an oscillating plate |66, a plan of which is shown in Fig. 7d and a partial plan of which is shown in Fig. 7a. At the rightward end of the plate |66 there is a fork |61 which straddles the portion of a screw |68 by which the Ibody member |63 is secured to the upper face of a body member |69. As the crank pin |64 crosses the leftward end of the plate |66 to describe a small circle, the rightward end ofthe plate |66 is kept from rotation and is permitted to slide back and forth in a lateral direction, as a result of the engagement of the fork |61 with the screw |68. On the lower face of the plate |66 there is a tooth |69 which, as a result of the motion transmitted to the plate |66 .by the crank pin |64, is caused to travel through a circle |10, Fig. 7a. f

The upper face of the body member |69 has therein a cavity |1| to receive a gear |12 which revolves on a portion of the screw. |13 in a position to be engaged by the tooth |69 as it oscillates. Each movement of the tooth |69 through the circle |10 will advance one tooth of the gear |12, thereby producing a slow rotation of the gear |12 as a result of the rotation of the rotor |53 of themeter 24'. Secured to the under face of the gear |12 there is a gear segment |14, likewise in the cavity |1|, this gear segment |14 having two teeth |15 adapted to engage the teeth |16 of a gear |11, each time the gear |12 makes a complete revolution. D f Y As shown in Fig. 10, the gear |11 is Xed on the upper end of a shaft |18 .which projects upwardly from the valve body or plug previously described with relation to Fig. la. This valve body I54 is rotatable in a recess |1'9formed in the body I 69 below the recess |1l'. Thevalve body 54 is held in the recess |19 by a' threaded plug |80 which surrounds the shaft |18 below the gear |16. The body member |69 has therein pressure and suction passage sections 23j and 24g which communicate respectively with the passage sections 23e and 24f of therhead |56, through passages Yformed, in the body member |63 as indicated by dotted lines |8| in the upper part of Fig. 7. The body memberv |69 has also therein the upper reduced portion of the chamber 41 formed above the valve piston 21 in the valve cylinder 26 which is formed in the body |82 which abuts the lower face of the body |69. In alignment with the passage sections 23j and 24g, the body, |82 has extending downwardly from the upper face thereof the lower extremity of the pressure passage,A embodied in the passage section 23g, and the suction passage section 24h. which constitutes the lower end of the suction passage 24.

The body |82 has also the upper ends 38a and 4|a of the operating iiud passages 38 and 4| first described with relation to Fig. 1a. The body |82 has likewise therein the ports 28, 29, 30, 3|, 39, 40, 42 and 43 adapted to cooperate with the channels 44 and 45 of the valve piston 21. The passages 38 and 4| are carried downward by passage sections 38D and 4|b in the body member |83 which closes the lower end of the inner shell I and which rests against the lower end of the body member |82, passage sections 38e and 4|c in the head |84 which closes the lower end of the outer shell Il, and terminates with passage sections 38d and 4| d of the fitting |85.

As shown in Figs. 1 and 7b, a connection is made with the chamber 46 at the lower end of the piston 21 through a small passage 23h drilled downwardly from the lower end lof the passage section 23g, this passage 23h. being continued downward into the upper portion of the body |83, Fig. '7, to meet a diagonal passage 231 in which a ow control orifice 49 is situated as shown in Fig. 12. Fluid pressure from the pressure passage 23 is conducted into the upper chamber 41 as shown in Figs. 7, 7a. and 11 by drilling and threading an opening |86 connecting the passage section`23f and the upper portion 41a of the chamber 41 and placing therein an orice member 49.

The pressure release passage 5|, shown schematically in Fig. la, is formed by drilling in the bodies |83, |92 and |69 interconnected passages as indicated at 5|a, 5|b, 5|c, 5|d, and 5|e, from the release port 50 of the chamber 46 to the port 52 of the pilot Valve 53. The pressure release passage 56 is formed from the pressure release port 55 of the upper chamber 41a to the port 51 of the valve 53, Fig. a, by interconnected drilled passages, 56a, 56h and 56o in the body |69, as shown in Fig. 11. As shown in Figs. l1 and 12, the pressure release valve closures 62 and 63 are formed on stems |81 having spheroidal inner ends |88 seated in openings |89 in the ends of the valve piston 21, thereby supporting the closures 62 and 63 so that they are self-aligning with respect to the ports 50 and 55.

As shown in Figs. 8, 8b, 9, and 9a, the pumping chambers 3| and 32, schematically shown in Fig. la, are formed in a tubular member |90 which forms part of the pumping section |8 by a median partitioned wall |9| which extends substantially from end to end of the tubular member |90. As shown in Fig. 8b, the edges |92 of the partition wall |9| are flared, and these flared edges of the partition wall |9| are provided with curved surfaces |93 which merge with the inner surface of the tubular member |90, cooperating therewith to form chambers 3| and 32 of approximately semi-circular cross section with rounded edges, following the curved surfaces |93. The upper end of the tubular member is brazed in a sleeve coupling |94 which has a bushing |95 threaded into its upper end for connection by screws |96 to the lower end of the head |84 which closes the lower end of the outer shell As shown in Fig. 9, the lower end of the tubular member |90 is brazed'in a sleeve connector |91 having a transverse Wall |98 and an internally threaded lower extension' |99 to receive an oil inlet tube 200. Referring to Fig. 8, the upper end 9|' of the partition wall |9| and an internal iiange 20| inthe coupling |94, form a shoulder around the upper ends of the pumping chambers 3| and 32. Upper connectors 202 for the expansile- contractile members 33 and 34 are disposed at the' upper ends of the chambers 3| and 32, each of these members being of the form shown in Figs'. 8c and 8e. They are each of cuplike form and have a top plate 203 and a downwardly extending side wall 204 externally shaped so as to correspond to the cross sectional shape of the chambers 3| and 32 and being externally of such size as to slip down into the upper end of a chamber 3| or 32. Each top wall 203 of the connectors 202 is of larger area than the side wall cross section so as to provide a flange 205 projecting from the upper edge of the side wall 204 for overlying the shoulder 20| formed by the upper end |9| of the wall |9| and the internal iiange 20| of the connector |94. The side wall 204 of each connector 202 is internally tapered so as to provide a cavity 206 which gradually decreases in area upwardly. As shown in Fig. 8e, a clamping plug 201 is provided for each cavity 206. Also, side wall 204 has around its upper edge adjacent the ange 205 a channel 208 to form a passage for the flow of gas or liquid to the inlet 209 oi. a gas bleed valve 2|0 for the upper end of the pumping chamber 3| or 32 associated therewith. As shown in Figs. 8c and 8e, the anges 205 have therein cooperating notches or recesses 209 dening an opening 2| aligned with the upper end of an oil discharge passage 2|2 formed along the rightward side of the partition wall |9|, and forming a connecting aperture between the passage 2|2 and the oil discharge passage 2|3 through the bodies |85 and |84, the upper end of this passage 2| 3 communicating with the annular discharge space or passage |1 within the outer shell As shown in Figs. 8c and 8d, the gas escape valves 2|0 are formed by drilling openings 2|4 horizontally into the top walls 203 of the connectors 202, from the notches 209', and slidably disposing in these openings 2|4 are longitudinally channeled closures 2|5 adapted to engage seats 2| 6 at the inner ends of the openings 2|4, and thereby prevent reverse flow of iluid through the valve inlet passages 209. As shown in Fig. 8c, a bow spring 2|1 is disposed in the opening 2|| formed by the notches 209 in such position that its ends will engage the rear ends of the closures 2 5 and yieldably force them outwardly into closing relation to the seats 2|6. y

As shown in Figs. 9 and 9b, the transverse wall |98 has therein inlet and discharge ports 2|8 and 2|9 communicating with the lower end of the pumping chamber 3|, inlet and discharge ports 220 and 22| communicating with the lower end of the pumping chamber 32. A valve body 222, which is clamped against the lower face of the wall |98 by the upper end of the oil inlet tube 200, has therein two oil inlet passages 223. communicating respectively with the ports 218 and 220 and each having therein an inlet check valve 35. The body 222 also has therein a pair of discharge valve passages 225 for connecting the ports 2I9 and 22| with an opening 226 in the transverse wall |98, which opening 226 communicates with the lower end of the pumped oil discharge passage 2|2. In each of the discharge passages 225 there is a discharge check valve 36. As shown in Figs. 9 and 9c, a plate 228 is secured to the lower face of the body 222 for supporting an inlet screen 220 which projects downwardly within the oil inlet tube 200. Diagonal openings 230, in the plate 228, connect the lower end of the inlet passages 223 of the body 222 with the upper ends of oil inlet tubes 23| which project downwardly from the head 228 within the screen 229. When the expansile- contractile members 33 and 34 are alternately collapsed and expanded in the chambers 3| and 32, oil will be drawn in through the passages 223, into the chambers 3| and 32, and will be discharged therefrom through the discharge passages 225.

Each of the expansile-contractile members 3| and 32 consists of a preformed tube 232, Fig. 13, of flexible material, such as a synthetic rubbei1 compound of oil-resisting qualities either reenforced or non-reenforced as may be desired. This tube 232 is molded to the shape shown in Figs. 13, 1311.132), 13C, and 13d. At the plane indicated by the line b-b of Fig. 13, the tube 232 has the cross-sectional form shown in Fig. 13b. Its external form and size at this plane b b are the same as the interior of the pumping chambers 3| and 32 in which it is to be used. At this plane it has a convex wall portion 233 and a flat wall portion 234 connected to the curved wall portion 233 by the edge wall portions 235 of sharper curvature. Upwardly from the plane b-b the tube 232 gradually changes from the approximately semi-circular form shown in Fig. 13b to circular form as shown in Fig. 13a. However, the change of the tube from flattened form, as shown in Fig. 13b, to circular form, as shown in Fig. 13a, is accomplished without change in the circumference of the tube. Therefore, it is possible to deform the upper end of the tube 232 from the circular form in which it is shown in Fig. 13a to the form disclosed in Fig. 13b, in which form the upper end of the tube 232 will fit into the pumping chamber. However, there will be a constant tendency for the upper part of the tube 232 to resume circular form and therefore the upper portion of the tube 232 will press tightly against the flat surface of the adjacent partition wall ISI when the tube is in a pumping chamber 3| or 32.

Downwardly from the plane b-b, Fig. 13, the tube 232 gradually changes toward the form shown in Fig. 13e, and then to the form shown in Fig. 13d. The inner or flat wall 234 of Fig. 13b is bent inwardly so that regarded in cross section, it will have a reentrant curve 236. This curving of the rubber wall 234 at 236 will result in the edge curves 235 being drawn toward each other as indicated at 235 in Fig. 13o, and as the reentrant curve of the wall is increased so that it substantially touches the wall 233 as shown in Fig. 13d, the edge curves 235 of the tube 232 will be further drawn toward each other as indicated at 235D. AIt will be understood that the change in the form of the tube wall from the plane b--b to the plane d-d will be accomplished without substantial change in thecircumference of the tube; therefore, it is possible to inflate the device, as shown in Figs. 13, 13o and 13d, into engagementwith the adjacent walls of the pumping chamber in which it is employed without stretching the tube wall. Below the plane df-d the tube 232 relatively rapidly changes from the form shown in Fig. 13d to the form shown in Fig. 13o so that its lower end -231 will fit into a lower connector or closure 238, as shown in Figs. 9, 9a, and 9d. As shown in Fig. 9e, the closure 238 comprises a cup having a side wall 239 of external form and size corresponding to the cross sectional size and shape of a pumping chamber 3| or 32, so that the member 232 will t into the lower end of a pumping chamber as shown in the preceding iigures. On the inner face of the flat portion 240 of the wall 239 there is an arcuate wall 24| dening a vertical oil passage 242. The arcuate wall 24| cooperates with the wall 239 to form an upwardly faced cavity 243 having the same outline as the lower end 231 of the tube 232, so that the lower end 231 of the tube 232 may be received within the cavity 243 and therein clamped by a tapered clamping plug 244. The inner surface 245 of the walls 239 and 24| dening'the cavity 243 are tapered downwardly to correspond to the external taper of the clamping plug 244. As shown in Fig. 9d, the clamping plug 244 is placed in the lower end 231 of the tube 232 and the lower end of the tube and the plug are inserted in the cavity 243. Screws 246 are then employed to pull the plug 244 down into the tapered cavity 243, thereby clamping the lower end 231 of the tube 232 in the recess 243.

At the upper end of the oil passage 242 a rounded cover or closure 241 is supported by means of a hairpin spring 248 having outwardly bent portions 249 which enter laterally directed openings 25|) in the concave surface of the cover 241. The lower portion ci the spring 248 is clamped against the ilat wall portion 240 of the lower tube closure 238 by a channeled nut 25| held by a screw 252. This spring 248 is of such form that it tends to hold the cover 241 in the open position in which it is shown in Figs. 9d and 9e, in which position the cover 241 permits a free flow of oil through the passage 242. When the tube 232 is expanded or inflated from the shape thereof shown in full lines in Fig. 9d, so that the reentrant wall portion 236 of the tube will be moved into the position shown by dotted lines 236', the cover 241 will be swung into its dotted line position 241 to close the upper end of the passage 242 and prevent fluid pressure acting within the tube 232 from forcing a portion of the wall of the tube down into the upper end of the opening 242. The connector or closure 238, as shown in Fig. 9d, is held down against thel upper face of the transverse wall |98V by means of a screw 253, which passes upwardly through the Wall |98 and threads into the lower end wall 254 of the member 238. The lower end of the passage 242 is expanded so that it will communicate with one inlet and one outlet port in the transverse wall |98. For example, the expanded lower end of the passage 242 is shown in connection with the inlet and outlet ports 2 |8 and 2|9 of the transverse wall |98. The upper end of each tube 232 is inserted in the cavity 206 of an upper connector 202 and is clamped therein by a clamping body 201, the body 201 being drawn tightly up into the cavity 206 by screws 255, as shown in Fig. 8. Each top plate 203 of a connector 202 has an opening 256 therein, Fig. 8c, `and each clamping body 201 has an opening 2 51 extended vertically therethrough, connecting

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