US3768927A - Fluid pumping apparatus - Google Patents

Fluid pumping apparatus Download PDF

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Publication number
US3768927A
US3768927A US00134135A US3768927DA US3768927A US 3768927 A US3768927 A US 3768927A US 00134135 A US00134135 A US 00134135A US 3768927D A US3768927D A US 3768927DA US 3768927 A US3768927 A US 3768927A
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US
United States
Prior art keywords
cylinder body
piston
motor
pressure
movement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00134135A
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English (en)
Inventor
A Freeman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STANSTED ENG Ltd
Original Assignee
STANSTED ENG Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STANSTED ENG Ltd filed Critical STANSTED ENG Ltd
Application granted granted Critical
Publication of US3768927A publication Critical patent/US3768927A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/121—Lost-motion device in the driving mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders

Definitions

  • a hydraulic pump unit comprises fluid pumping apparatus having a pair of axially aligned cylinder and piston units, wherein the cylinder body is movable independently of the piston, the movement of the cylinder body being critically restrained by a resilient member so that the movement of the cylinder body may only occur upon attainment of a predetermined pressure within the body, a motor for driving the pumping apparatus, and a rapid acting brake operable upon movement of a cylinder body to stop the motor and hence the operation of the pumping apparatus.
  • a hydraulic pump unit comprises a high pressure pump, a motor for driving the [56] References Cited pump a pressure switch operable upon attainment of UNITED STATES PATENTS a desired pressure, and a rapid actir'rgbrake responsive 2,675,757 4/1954 Moore 417/214 X to the witch and arranged to stop the 3,062,591 11/1962 Brimhall 92/117 R X FOREIGN PATENTS OR APPLICATIONS 6 Chims, 2 Drawing Figures 552,443 5/1923 France 92/60.5
  • the conventional air driven type of high pressure pump has disadvantages in that it requires a local supply of compressed air which is frequently found to be inadequate to supply the substantial demand of air required to drive the pump, and is frequently subject to wide pressurefluctuations resulting from other demands which may be made on the com-. pressed air supply by other independent equipment.
  • other problems arise due to the effect of excess water, oil and rust, which can be carriedover in the air supply and which may contaminate the working parts of the air motor which drives the pump.
  • air drivenpumps are very wasteful in their consumption of power.
  • a pump utilising apparatus in accordance with the invention may be more than fourtimes as efficient in its utilisation of electric power than comparable air hydraulic pumps.
  • the invention in another aspect consists in a hydraulic pump unit comprising a high pressure pump, a motor for driving said pump, in a pressure switch operable upon attainment of a required pressure, and a rapid action brake responsive to said switch and arranged to stop said pump.
  • FIG. 1 is a side view of a hydraulic pump unit
  • a hydraulic pump W is driven by an electric motor X which is fitted with a rapid acting magnetic brake Y arranged to stop the motor and pump when the electric power is switched off/Hydraulic fluid is passed to the pump W from a tank V via a pipe 2.
  • the pump W is shown in detail in FIG- 2.
  • a drive shaft from the electric motor is keyed to drive an eccentric cam A arranged within a crank case U.
  • the 'cam A carries a ball race Q the outer ring of whichbears freely against a pair of big end shoes B.
  • a high pressure reciprocating piston D arranged to slide within a cylinder body G.
  • Balls R provide articulating thrust joints between the shoes B and the bases of the respective pistons D.
  • Each piston and cylinder body unit is provided with a high pressure hydraulic fluid inlet valve C and a high pressure outlet valve E.
  • the cylinder bodiesG are provided with seals T which seal against the pistons D to ensure that fluid drawn in through inlet valve C from the crank case U is discharged through outlet valves E.
  • the ends of the cylinder bodies G remote from the crank case are provided with roller bearings H which bear against bell crank levers I. Movement of the levers I is restrained by a loaded compression spring L whose load is adjustable by a hand wheel M.
  • the load in spring L is predetermined so that each cylinder body G may move in the direction of the pressure stroke of the piston D only upon attainment of a critical pressure within the cylinder body.
  • a microswitch J is associated with one lever I and arranged to operate the brake Y to stop the motor X upon movement of either lever I.
  • a wormscrew stop K prevents overloading of the spring L by the adjustment wheel M.
  • An alternative method of controlling the pump which may be used when charging a large capacity vessel or system, incorporates a pressure switch in the system to control the starting and stopping of the pump.
  • a pressure switch in the system to control the starting and stopping of the pump.
  • Such an arrangement has been found to afford advantages in the accuracy of controlling and in the simplicity of changing the control pressure setting.
  • the basic pump control effected by the floating cylinder body G remains operative and would be set at a higher pressure so as to ensure the ultimate safety of the pump and the system.
  • a pump generally as shown in FIG. 2 combined with a drive motor and fast acting magnetic brake is able to respond with greatprecision to a pressure switch or an electrical contact fitted to a pressure gauge.
  • the jump is able to compensate for minute variations of pressure by injecting fluid at a fraction of a strokes displacement at a time, this action being possible by virtue of having the rapid acting brake and therefore being able to inch the motor at a fraction of a revolution each time, at least one cylinder remaining in a charged condition at all times.
  • a hydraulic pump unit as set forth in claim 1, wherein said resilient restraint means includes means for adjusting the load applied by said resilient restraint means against said cylinder body.
  • a hydraulic pump unit as set forth in claim 1, wherein said resilient restraint means includes a compression spring.
  • a hydraulic pump unit as set forth in claim 4 wherein a roller bearing is mounted on the end of said cylinder body in contact with said lever for compensating for variations in the resilient load during movement of said lever.
  • a hydraulic pump unit as set forth in claim 1, wherein two said pumping chambers are arranged in axial alignment, with one said cylinder body and piston axially aligned within each said pumping chamber and with said pistons disposed in axial alignment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US00134135A 1970-04-18 1971-04-15 Fluid pumping apparatus Expired - Lifetime US3768927A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1863270 1970-04-18
GB467671 1971-02-15

Publications (1)

Publication Number Publication Date
US3768927A true US3768927A (en) 1973-10-30

Family

ID=26239304

Family Applications (1)

Application Number Title Priority Date Filing Date
US00134135A Expired - Lifetime US3768927A (en) 1970-04-18 1971-04-15 Fluid pumping apparatus

Country Status (8)

Country Link
US (1) US3768927A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS531481B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE765759A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA951963A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2118574A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1301687A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7105095A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE369760B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE447090B (sv) * 1983-10-31 1986-10-27 Folke Ivar Blomberg Bromskraftsmodulator for hydrauliska fordonsbromsar
EP0140862B1 (en) * 1983-10-31 1989-04-26 Folke Ivar Blomberg Braking force modulator
DE102004005204A1 (de) * 2004-02-03 2005-08-11 Continental Teves Ag & Co. Ohg Radialkolbenpumpe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR552443A (fr) * 1922-06-02 1923-05-01 Simon Freres Sa Des Ets Pompe de compression hydraulique
US2675757A (en) * 1954-04-20 Electrically controlled liquid
US3062591A (en) * 1957-01-11 1962-11-06 Ray S Brimhall Combination of a normal and auxiliary braking system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675757A (en) * 1954-04-20 Electrically controlled liquid
FR552443A (fr) * 1922-06-02 1923-05-01 Simon Freres Sa Des Ets Pompe de compression hydraulique
US3062591A (en) * 1957-01-11 1962-11-06 Ray S Brimhall Combination of a normal and auxiliary braking system

Also Published As

Publication number Publication date
NL7105095A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-10-20
GB1301687A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-01-04
SE369760B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-09-16
BE765759A (fr) 1971-08-30
CA951963A (en) 1974-07-30
JPS531481B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-01-19
DE2118574A1 (de) 1971-12-02

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