US2599701A

US2599701A - Pumping system

Info

Publication number: US2599701A
Application number: US624471A
Authority: US
Inventors: Walter R Eames
Original assignee: Eaton Manufacturing Co
Current assignee: Eaton Corp
Priority date: 1945-10-25
Filing date: 1945-10-25
Publication date: 1952-06-10
Anticipated expiration: 1969-06-10

Description

June 10, 1952 w R. EAMES 2,599,701

PUMPING SYSTEM Filed Oct. 25, 1945 4 Sheets-Sheet 1 IN V EN TOR.

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PUMPING SYSTEM Filed Oct. 25, 1945 4 Sheets-Sheet 3 IN V EN TOR.

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err-cavem- June 10, 1952 w. R. EAMES 2,599,701

PUMPING SYSTEM Filed Oct. 25, 1945 4 Sheets-Sheet 4 INVENTOR.

QTTOINI'KS Patented June 10, 1952 PUMPING SYSTEM Walter R. Eames, Warren Township, Macomb County, Mich., ing Company, of Ohio assignor to Eaton Manufactur- Cleveland, Ohio, a corporation Application October 25, 1945, Serial No. 624,471

8 Claims. i 1 This invention relates to pumping systems and more particularly to multiple stage compound pumping systems. l

- Broadly the invention comprehends a pumping system embodying a multiple pump arranged in circuit having suitable valve control means therefor adaptable to provide for multiple stage pressure operation of the pumping system.

An object of the invention is the provision of a simple, efficient multiple stage pumping system.

Another object of the invention is the provision of a pumping circuit embodying a plurality of pumps and appropriate controls therefor to provide for varying stages of pressure compounding.

- Another object of the invention-is the provision of a pumping system adapted to pump at high capacity-low pressure during one phase of operation and low capacity-high pressure during v another phase of operation.

Another object of the invention is the provision of a two-stage compound pumping system operable initially in parallel at high capacity-low pressure and after a predetermined pressure attainment operable at series in low capacity-high pressure. i

A further'object of the invention is the provision of a two-stage compound pumping circuit embodying a pair of diiferent capacity pumps suitably controlled by automatic pressure responsive valves so as to be operable initially in parallel at high capacity-low pressure and subsequently upon attainment of a predetermined pressure in series at low capacity-high pressure.

Other objects and advantages of the invention will appear from the following description taken in connection with the drawings, forming a part of the specification; and in which:

Fig. 1 is a schematic diagram of the pumping circuit; 1 I

Fig. 2 is a vertical, cross-sectional view of a two-stage pumping system embodying the invention.

FigLB is a vertical view taken along line 3--3 Fig. 4 is a cross. sectional view taken along line-4+4 of Fig. 3;

Fig. 5' is'a cross sectionaliview taken along line Fig. 6 is a sectional view similar to Fig. 3 but in less detail; i i

Fig. 7 is a cross sectional view taken along line 1-1 of Fig.6;

. Fig. 8 is a fragmentary sectional view. taken along line 81-8 of Fig. 6;

Fig. 9 is a fragmentary cross sectional view taken along line 9--9 of Fig. 6; and

Fig. 10 is a schematic diagram of the modified form of the pumping circuit shown by Fig. 1.

The instant invention is directed at a multiple stage compound pumping circuit wherein pressures developed are beyond the range of a single stage pumping circuit such that the use of several stages cuts the effective loads of one pump while at the same time providing for increased pump life. Circuits of this type are adaptable for use where initial capacity is of utmost importance and secondly high pressure such as in the case of automatic transmissions to provide holding pressure for the clutches employed therein. When shifting from one set of clutches to another it is desirable to have the particular clutch system selected filled rapidly so as to efiect quick engagement and thence to be engaged at high pressure as the pumping system advances from its initial high capacity-low pressure stage to subsequent lower capacity-higher pressure stages.

The circuit herein specifically devised comprises a pair of rotor type pumps of slightly diiferent capacities arranged in circuit with appropriate check and relief valves for automatically controlling the compound parallel and series operation of the pumps as they pass through the initial high capacity-low pressure stage to the low capacity-high pressure stage.

Referring to the drawings for more specific details of the invention, Fig. 1 represents a diagrammatic showing of a pump circuit herein devised wherein l0 and I2 represent respectively a pair of rotor pumps, l0 operating as the first stage pump and I2 the second stage pump of a two-stage compound pumping circuit. Intake lines l4 and I6 connected respectively to pumps 10 and I2 communicate with a reservoir, not shown, by way of inlet line IS with a one-way check valve 20 interposed in the intake line It of the second stage pump. A relief and control valve 22 interposed intermediate to the discharge line 24 of the pump I0 and intake to the pump I2, said valve 22 also controlling communication between the fluid intake and discharge of pump I 0. The pumps! and I2 have respectively in their direct discharge line 26 and 28 a one-Way check valve 30 for pump I 0 and pressure relief valve 32 for pump l2. The discharge lines 25 and 28 communicate beyond the

valves

30 and 32 with a fluid line 34 adapted to be associated with the mechanism to be operated by the pump action. A relief port 36 is associated with the relief valve 32 providing the return of pressure fluid to the reservoir upon cracking of valve 32.

With reference to Figs. 2 through 9 of the drawings, illustration is made of the specific embodiment of the aforementioned pumping circuit in a simple, compact arrangement, of pumps and controls therefor in a single housing.

A housing Iiit having suitable end plates I62 and I04 suitably secured on opposite ends thereof is provided with appropriate chambers Iflii and IE8 for the receipt and support of pumps It and I2 driven by a single shaft I I suitably journaled in the housing It!) on bearings H2 and in the end plate IM on bearings H4. The pumps I9 and I2 are of the type including respectively a pair of toothed rotors Ill: and H8, and I28 and I22, one within and eccentric to the other and having a least one less tooth division than the other, the teeth having diagrammatic opposed full mesh and open mesh positions and preferably remaining in substantially contacting relationship, with respect to each other between such positions. The rotors H8 and I22 are keyed to the shaft H0 and are driven thereby, said rotors driving their mating rotors through the inter-engagement of their respective teeth, and asthe teeth move away from the full mesh position in the direction of rotation, they open etween them pum hamb s w i h c ntinu to increa in v lume which chambers decrease in volume irem open m sh pos ti n to. full m s p tion in the direction of rotation The first stage pump I0, is

as shownmadeoi sl h ly ea er apacity. than second stage pump I2.

The type. of pumps. here employed is. not to be taken as any. limitation of the invention but merely, as an example of compact effioient pumps suitable for a pumping circuit of this nature.

The pump, housing Hi0 is, provided with inlet passage {24% (I3, Fig. 1) which communicates respectivelywith chambers I and Hi8; by way of passages I26 and I28 (I4 and I6, Fig. I), said passage I28; being controlled by a one-way check valve I311 (20, Fig. 1) secured upon house 'ing I00. VA spring pressed control and reliei valve. I32. (22, Fig. 1)v mounted for reciproca-W tion in a bore. I in the. housing controls'communication between a passage I35 on the inlet side of pump I12 and passage I38 (2.4, Fig, 1) connected to thedischarge. side of pump. III, said valve L32 also adapted to control passage I40 providing communication between the inlet and dischargepassages of pump I0 by way of bore I34.

The, pump I2 is provided with an outlet passage I42 (28, Fig. 1). communicating with a spring pressed relief b'y-pass valve I44 (32, Fig. 1) reciprocable in a bore? I46 in housing I00 controlling the. outlet pressure of pump 12- by way of pressure relief port I48 adapted to be connected with the reservoir for the pumping circuit. The pump I0. discharges through a passage I59 (26, Fig. l). in the end plate I04 controlled as by a one-way check valve I52 (30, Fig. 1) interposed in the passage. The discharge passages I42 and I50. of the. respective. pumps II)v and I Z-areadapted to be suitably. connected at a point adjacent to, or remote from-.the pump housing such as shown; by. fluid line 34.01" Fig. 1 depending on the design requirements,

Fig. 10 illustrates a modified iorm of pump circuit shown by Fig. 1 wherein the. difference resides, in the addition ofa pump 28D, relief and control valve 202, and check valves 2.04. and 206. B he ddi ic e eof anot er p p tageor to open mesh position and mum. at ng pressu e. e

operation is provided and accordingly the stages of operation of circuits of this type are solely to be limited by the number of pumps provided. Inasmuch as the operation of this system follows the teachings of the pump circuit shown by Fig. 1 and hereinbeiore described it is not deemed necessary that the precise, operation hereof be recited other than to indicate that a proper selection of pump capacities and valve'pressures is vitally important to the successful operation of the system.

For the purpose of illustrating a. typical pumpins circuit utilizing the instant scheme of twostage compound pumping, the following'pump capacities and' control valve operating pressures are used, the first stage pump IIl-5 gallons, second stage pump I2-4 gallons, control and relief valve I32 acting as a control valve to provide'communication between the inlet side of pump I2 and outlet or discharge port of pump III a #(sqn.- oi pump i and a a relietvel at 250 s1- scharg pre u e Y up. provide communication between the nd. t e Qf ump ll SQ s. t innit e 911ml? Ill. 32. 2.59. #/s -i a 3 1 a v I s et at 50-9 f to so @Qntmi c mbin ci; d scha e ure f t e ump l nd V a a ees wh n ope aimn a .v qi the .1 pre ure ump W h a cresa d on r l e sur s a meal: entrances pum ing c uit up n. i .tet onoiqtne' ait 1e and consequent operation of the pumpsgtg and}, 2, u d r wn imp th resav oi the sump ircu t. i the p mnspm idin v en Pum pre sure a irqm t e pec ve; pumps- 1 initial stages of pressure. dev H n i r: pre s re sde ivere Charge passasss iz; a ec anism; t h iner iedthe ebvpar l staeact qner n i; t e n a er s ei -me Q 1; e pressure as a combined pumping a 'f p mps y way i fluid d li! m mea 3,4. sh wn by ie. 1., II-hewmn t a ion of t e pumps ccntinues \m he. P u e ere cnec be. 1 m 2: h qinral e e s s i t to p i f luid Pre and t rough hen r t r i ia sta o d schar 1hr 12 4 ser s. will ex t b Durin this phas c onera iqni pump I2 from the reservoir, whereas Ontarians to pump I2, valve I32 is further moveminibore I34; until such time. as the: discharge pressure of pump I0 reaches 250 s m. whereinas the;

V c v e. passage. m;soast m iu gco nication between the intake and dischargsiiies: of the. pump, it and. thus limit: the d velopment of pressure on the fluid in pump III to 25041E/sd. in. With, the control and. relief: valve... I 32 actuated 'to lt-S limit at 250 #/Sq. in. operatingfipsessuzia a: pump I0 and check valves-..I3fl and I52; seated-the pressure developed by pumpJIII.isapplied to 12 in the complete series operation of the pumps and the discharge of fluid under pressure is delivered from pump I2 of outlet I42 to the mechanism to be actuated thereby. As a means of controlling the maximum pressure at which the compound pumping circuit is desired to be operated, relief valve I44 is set to crack at 500 #/sq. in. to thus provide for relief of pressure fluid from the system through pressure relief port I48 which although not shown as such, is preferably adapted to be communicated back to the reservoir of the pumping circuit. After utilization of the pressure is developed for its intended purpose, the recession of pressure in the system causes the actuation or return of the valves to their normal positions and thus provides the reversal of operation of the pumping circuit, that is, from series pump operation at high pressure-low volume to low pressure-high volume. This completes a cycle of operation of the pumping circuit.

The pump capacities or control valve pressures hereinbefore recited are not to be taken as limitations upon the pumping circuit herein devised or its nature of operation except to the extent that it presents a practical arrangement that can be employed.

While this invention has been described in con nection with certain specific embodiments, the principle involved is susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention, therefore, is limited only as indicated by the scope of the appended claims.

What I claim is:

1. In a compound pump circuit, a pair of pumps and a combination pressure staging control and relief valve interposed between the outlet of one pump and the inlet of the other pump and the outlet and inlet of the pump whose pressure it controls, one of said pumps having a one-way check valve in its intake and said other pump having a one-way check valve in its discharge line said pressure staging and relief valve being subject to the pressure output of the pump having a one-way check valve in its discharge line.

2. In a compound pump circuit, a pair of interconnected, unlike capacity pumps, a combination pressure staging control and relief valve in the interconnection between the outlet of one pump and the inlet of the other pump and the outlet and inlet of the pump whose pressure it controls, fluid supply means for the pumps, a check valve in the intake side of one of the pumps, a check valve in the discharge of the other pump, and a pressure relief valve in the discharge of the pump having the check valve in its intake said pressure staging and relief valve being subject to the pressure output of the pump having a one-way check valve in its discharge line.

3. In a compound pump circuit, a pair of interconnected, unlike capacity pumps, a combination pressure control and relief valve in the interconnection between the outlet of one pump and the inlet of the other pump and the outlet and inlet of the pump whose pressure it controls for controlling the pressure at which the pumps change from a parallel to series operation and for limiting the maximum output pressure of the larger capacity pump, operable under the influence of pressure fluid discharged from the larger capacity pump, fluid supply means for the pumps, a check valve in the intake side of the smaller capacity pumps, a check valve in the discharge of the other pump, and a pressure relief valve in the discharge of the smaller capacity pump, said control and relief valve controlling the output capacity of the larger capacity pump and also the communication between the discharge and intake thereof.

4. A compound pump circuit, a pair of intercommunicated unlike capacity pumps driven from the same shaft, valve means interposed in the communication between the outlet of the larger capacity pump and the inlet of the lesser capacity pump and the inlet and outlet of the larger capacity pump for respectively controlling the pressure at which the pumps are to change from parallel to series operation and for limiting the output pressure of the larger capacity pump in the series operation thereof operable under the influence of pressure fluid discharged from the larger capacity pump, and check valve means in the discharge and inlet of the respective second and first pumps for assisting in the control of the pump circuit during] the parallel and series operationthereof.

5. A compound pumping circuit comprising a plurality of unlike capacity pumps having intercommunication with one another between the outlets of the larger capacity pumps and the inlets of the adjacent lesser capacity pumps normally arranged for initial parallel pump operation and combination pressure relief and control staging valves in the discharge of all of the pumps but the pump with the least capacity operable under the influence of pressure fluid from the pump in whose discharge it is located for controlling the pressure at which each pump will operate in series with the pump of next lesser capacity, said valves being also arranged in a conduit communication between the inlet and outlet ports of all the pumps but the pump of least capacity for limiting the maximum output pressure of its associated pump.

6 A compound pumping circuit comprising two unlike capacity pumps communicating with one another, valve means interposed between the outlet of the larger capacity pump and the inlet of the lesser capacity pump and between the outlet and inlet ports of the larger capacity pumps for controlling either the parallel or series operation of the pumps, said valve means being pressure actuated to initially control the parallel operation of the pumps intermediate the series operation of the pumps and finally to control the maximum output pressure of the larger pump, said valve means being operable under the influence of the pressure fluid being delivered from the first stage pump of the series stage of operation, a check valve in the discharge from the larger capacity pump, and a check valve in the intake to the smaller capacity pump for assisting in the control of the pumping circuit during the operations of the pump through both stages of parallel and series operation.

7. A multiple pump unit comprising a unitary body having a plurality of unlike capacity pumps mounted thereon and having interconnected passages between their respective intake and discharge and between the discharge of the larger capacity pump and intake of the smaller capacity pump, a drive shaft journalled in the body common to both pumps, apressure responsive valve controlling communication between the discharge of the larger capacity pump and intake of the smaller capacity pump and communication between the discharge and intake of the larger capacity pump, said valve operable upon a predetermined pressure discharge from the larger capacity pump to change the pumps from a series to parallel stage of operation and: further op-ir pacity pump to limit the maximum output pressure thereof.

8. A compoundpumping circuit comprising a plurality of unlike capacity pumps having interconnected passages between their respective in take and dischargeandbetween the discharge of: the larger capacity pump-and thesmal-ler'capacity pump, means for driving the pumps simultaneously, a pressure responsive valve controlling communication between the discharge: of the larger capacity pump and the intake-cf, the smaller capacity pump and communication, between the discharge and intake of the larger capacity pump, said valve operable upon a predetermined, pressure discharge from the; larger capacitypump to change the pump from aseries to parallel. stage of operation and furtheroperable at, a higher predetermined pressure to limit the maximum output pressure of the larger capacity pump, a one way check valve in the discharge from the larger capacity pump, a one way check valve in the intake to the smaller capacity pump and a pressure responsive valve for controlling communication between the discharge and intake of the smaller capacity pump, said latter pressure responsive valve operable upon predetermined pressure discharge of the smaller capacity pump to limit the maximum output pressure thereof. WALTER R. EAMES.

REFERENSES CIT-ED The following references are of record in the file of this-patent:

UNITED STATES PATENTS Number, Name Date 1,477,850 Pool Dec. 18, 1923 1,825,661 Gull Oct. 6, 1931 2,132,130 Sallot Oct. i,- 1938 2,218,565 Vickers Oct. 22, 1940 2,255,560 Fieber etal.- Sept. 9, 1941 2,286,392 Herman et a1. Apr. 21', 1942 2,366,388 Crosby Jan. 2,. 1945 2,377,556 Jeannin June 5-, 1945