GB1449852A - Control of fluid pumps - Google Patents

Control of fluid pumps

Info

Publication number
GB1449852A
GB1449852A GB3793273A GB3793273A GB1449852A GB 1449852 A GB1449852 A GB 1449852A GB 3793273 A GB3793273 A GB 3793273A GB 3793273 A GB3793273 A GB 3793273A GB 1449852 A GB1449852 A GB 1449852A
Authority
GB
United Kingdom
Prior art keywords
pressure
speed
pump
inlet
switches
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
Application number
GB3793273A
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.)
Coppen J D
Original Assignee
Coppen J D
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 Coppen J D filed Critical Coppen J D
Priority to GB3793273A priority Critical patent/GB1449852A/en
Publication of GB1449852A publication Critical patent/GB1449852A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2066—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source
    • G05D16/2073—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source with a plurality of pressure sources
    • 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
    • F04B49/06—Control using electricity
    • 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
    • F04B49/08—Regulating by delivery 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
    • F04B49/20—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 changing the driving speed

Abstract

1449852 Centrifugal pumps J D COPPEN 8 Aug 1974 [10 Aug 1973] 37932/73 Addition to 1376622 Heading F1C [Also in Division G3] The control system of the Parent Specification, in which the output pressure of a centrifugal pump 1 is controlled in response to a reference (set at 17) which is automatically adjusted if the inlet pressure is below a further reference (set at 14) to prevent cavitation or collapse of a soft inlet hose, is modified in that the pressure error signal is now only a component of a control signal for adjusting the speed of the pump. As shown, the pressure error signal at 18 is combined at 19 with the reciprocal of pump speed from a tachometer 8 and unit 9; this is to linearize the system gain (pump pressure being a non-linear function of speed). The output of 19 is connected to proportional and integrating amplifiers 20, 21 whose sum, at 22, constitutes a speed reference with which the actual speed is compared at 23, any error causing adjustment of the drive engine 3 by servo 4, 5. In the Figures, 2 is a transmission unit, and 6, 7 are pressure transducers protected by resistors or pressure snubbers 10, 12 and relief valves 11, 13. In Fig. 3 (not shown), the inlet pressure transducer comprises two on/off pressure switches, one or the other being selected according to whether hose collapse or cavitation is the limiting feature, and which cause a step change in the delivery pressure reference. If the inlet supply is restricted the system cycles the pump speed between two values alternately. In a modification of this Fig. 4, (not shown) a pair of switches are connected to an integrator which either gradually increases, holds steady, or decreases the delivery pressure reference. In a further alternative Fig. 5, (not shown) a series of sequentially operated pressure switches progressively short circuit a resistor chain, for the inlet and/or the delivery transducers. Fig. 6 (not shown), illustrates various alternatives in the system, e.g. constant speed drive with variable speed transmission, any form of prime mover, and mention is made of the control system being digital electric, fluidic or in mechanical form. There may also be a vibrational or acoustic cavitation detector to reduce the speed if this becomes excessive.
GB3793273A 1973-08-10 1973-08-10 Control of fluid pumps Expired GB1449852A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3793273A GB1449852A (en) 1973-08-10 1973-08-10 Control of fluid pumps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3793273A GB1449852A (en) 1973-08-10 1973-08-10 Control of fluid pumps

Publications (1)

Publication Number Publication Date
GB1449852A true GB1449852A (en) 1976-09-15

Family

ID=10400037

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3793273A Expired GB1449852A (en) 1973-08-10 1973-08-10 Control of fluid pumps

Country Status (1)

Country Link
GB (1) GB1449852A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010464A1 (en) * 1978-10-23 1980-04-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and device for starting a cryogenic-liquid pump
EP0048342A2 (en) * 1980-09-16 1982-03-31 Häny & Cie. AG. Process and apparatus to supply a pressure fluid which is pumped with a variable pressure
DE3815518A1 (en) * 1988-05-06 1989-11-16 Pierburg Luftfahrtgeraete Method and a device flowed through by a gas, in particular air, for carrying out the method
US7197878B2 (en) 2003-05-09 2007-04-03 Rolls-Royce Plc Pump control system
WO2012121680A3 (en) * 2011-03-09 2012-11-15 Strip's D.O.O. Pump control device with multiple sensors microprocessor controllers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010464A1 (en) * 1978-10-23 1980-04-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and device for starting a cryogenic-liquid pump
FR2439881A1 (en) * 1978-10-23 1980-05-23 Air Liquide METHOD AND DEVICE FOR STARTING A CRYOGENIC LIQUID PUMP
EP0048342A2 (en) * 1980-09-16 1982-03-31 Häny & Cie. AG. Process and apparatus to supply a pressure fluid which is pumped with a variable pressure
EP0048342A3 (en) * 1980-09-16 1983-11-23 Hany & Cie. Ag. Process and apparatus to supply a pressure fluid which is pumped with a variable pressure
DE3815518A1 (en) * 1988-05-06 1989-11-16 Pierburg Luftfahrtgeraete Method and a device flowed through by a gas, in particular air, for carrying out the method
US7197878B2 (en) 2003-05-09 2007-04-03 Rolls-Royce Plc Pump control system
WO2012121680A3 (en) * 2011-03-09 2012-11-15 Strip's D.O.O. Pump control device with multiple sensors microprocessor controllers

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee