US3309995A - Liquid pumping apparatus - Google Patents

Liquid pumping apparatus Download PDF

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Publication number
US3309995A
US3309995A US435198A US43519865A US3309995A US 3309995 A US3309995 A US 3309995A US 435198 A US435198 A US 435198A US 43519865 A US43519865 A US 43519865A US 3309995 A US3309995 A US 3309995A
Authority
US
United States
Prior art keywords
pump
flow
valve
liquid
centrifugal pump
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
US435198A
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English (en)
Inventor
Stanley R Tyler
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.)
Dowty Fuel Systems Ltd
Original Assignee
Dowty Fuel Systems 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 Dowty Fuel Systems Ltd filed Critical Dowty Fuel Systems Ltd
Application granted granted Critical
Publication of US3309995A publication Critical patent/US3309995A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/22—Fuel supply systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/22—Fuel supply systems
    • F02C7/236—Fuel delivery systems comprising two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening

Definitions

  • a pumping apparatus comprises a centrifugal pump having an inlet arranged to receive liquid from a source, a flow control device arranged to regulate the flow of liquid from the source through the inlet of the centrifugal pump, the centrifugal pump being such that under the regulation of flow at its inlet the liquid within the pump may form an annulus whose radial depth controls the pump outlet pressure, a positive displacement pump assembly connected to the outlet of the centrifugal pump and having an outlet for connection with a load at pressure, regulating means operable to vary the effective delivery of the positive displacement pump assembly when the maximum delivery of which this assembly is capable at a given pump speed exceeds the regulated flow through the centrifugal pump, said regulating means being responsive to the pressure rise across the liquid annulus in the centrifugal pump and being operative to maintain said pressure rise at a substantially constant value by varying the effective delivery of the positive displacement assembly.
  • the variable throttle valve 22 comprises a casing 26 having a valve bore 27 in which a waisted piston valve member 28 is axially slidable,
  • the valve bore 27 has an inlet port 29 in open communication with the waisted portion of the valve member 28, and an outlet port 31 which is variably throttled by the valve member 28 at one end of the waisted portion.
  • the valve member 28 is urged in the valve-opening direction by a spring 32 which acts through an axial thrust bearing 33, and in the valveclosing direction by fluid pressure from the delivery pipe 3 which is admitted to a chamber 34 at the end of the valve member 28 which is remote from the spring 32.
  • valve member 28 extends into a chamber which is connected by a pipe 20 to the interior of the centrifugal pump casing at the eye of the rotor 11.
  • the valve member 28 is formed with a spur gear 35 meshing with a spur gear 36 which is carried by a continuously rotated shaft 37.
  • the latter spur gear 36 is elongated to maintain driving connection throughout axial movement of the valve member 28.
  • the device includes a flow control valve 38 having a cylinder 39 with an inlet port 41 receiving liquid from the pump 4 and an outlet port 42 delivering liquid to the nozzle 7.
  • a movable valve member 43 has a waisted portion 44 providing at all times an unrestricted flow through the inlet port 41 while the valve member at one end of the waisted portion 44 variably restricts the outlet port 42.
  • the valve member 43 is urged towards the valve-open position by a spring 45 and is actuated in the valve-closing direction by a manually operable cam 46.
  • the flow control valve 38 acts through a servo valve 47 to control the piston 15 which regulates the inlet valve 12, 13 of the centrifugal pump 2.
  • the servo valve comprises a cylinder 48 having a large bore 49 slidably receiving a piston 51, and a small bore 52 slidably receiving a stem 53 which extends from one end of the piston 51.
  • the large area face of the piston 51 and the cylinder 48 together define a chamber 54 which houses a compression spring 55 and which is connected by a pipe 56 to the outlet pipe 5 on the downstream side of the control valve 38.
  • the annular face of the piston 51 and the cylinder 48 together define a chamber 57 which is connected by a pipe 58 to the outlet pipe 5 on the upstream side of the control valve 38.
  • the end of the stem 53 is connected by a central bore 60 to the chamber 54 whereby the effective pressure loaded area of the piston 51 in the chamber 54 is equal to the annular area in the chamber 57.
  • the small bore 52 has a port 59 connected to the pipe 58, the port 59 being continuously in free communication with a waisted portion 63 of the stem 54.
  • a second port 64 spaced axially from the port 59 is variably restricted by the stem 53 at one end of the waisted portion 63.
  • the port 64 is connected by a pipe 66 to a chamber 67 in the cylinder 16 on the spring-loaded side of the piston 15.
  • the pipe 66 is connected through a fixed restrictor to a pipe which leads to the pump inlet pipe 1.
  • a chamber 18 in the cylinder 16 on the stern side of the piston 15 is maintained at pump delivery pressure in the pipe 5 by a connecting pipe 19.
  • the fluid pressure in the chamber 6'7 is determined by the relative throttling of the port 64 and the fixed restrictor 62, so that an increase in the port opening 64 will cause the piston 15 to move in the opening direction of the valve member 13, while a decrease in the port opening will cause the piston 15 to move in the valve closing direction. If a reduced flow rate through the pipe is required, the cam 55 is turned to lower the valve member 43 whereby the outlet port 42 is increasingly throttled, causing an increased pressure drop which acts through the pipe 58, 56 to move the piston 51 against spring load. The stem 53 increases the throttling of the port 64 to decrease the liquid flow therethrough.
  • flow-controlling device 6 may be modified and elaborated to be additionally responsive to further controlling parameters such as maximum speed and air to fuel ratio, by the inclusion of known mechanisms.
  • the centrifugal pump 2 may be incapable of generating the necessary pressure for satisfactory fuel atomization by the nozzle 7, and the positive displacement pump 4 accordingly generates the required pressure. While the centrifugal pump 2 is regulated as described to supply the required rates of fiow to the nozzles, the rate may be less than the displacement of the pump 4. Cavitation within the pump 4 is avoided by permitting recirculation of part of the flow 'hrough the by-pass passage 21 and the variable throttle valve 22 to the pipe 3.
  • the movable member 2% of the throttle valve 2 will automatically move to a position causing a degree of closure of the port 31 which passes a recirculated flow equal to the difference between the flow through the pump 4 and the controlled fiow through the centrifugal pump 2.
  • the position of the movable member is determined by the pressure difference between the outer annulus and the eye of the centrifugal pump 2, as communicated through the pipes 3 and 26) to opposite ends of the member 23, and by the spring 32. This pressure difference is determined, for a given speed of the rotor 11, by the radial depth of the liquid annulus in the pump 2.
  • the centrifugal pump 2 supplies the required flow at high pressure through the pipe 3.
  • the non-return valve 23 and the by-pass valve 22 close under this high pressure.
  • the excess of liquid fiow over that displaced by the pump 4 is Dy-passed through the non-return valve 25 and the passage 24 to the outlet pipe 5.
  • the positive displacement pump 4 is preferably designed to deliver fuel somewhat in excess of the demand at the burner ignition condition of the engine, at which condition the centrifugal pump does not provide sufficient pressure to give the required fuel delivery from the nozzles '7.
  • variable delivery pumping assembly comprising a positive displacement pump of variable volumetric capacity in which the capacity is varied by a device responsive to the pressure difference across the centrifugal pump 2.
  • the positive displacement pump 4 has been described as being engine driven, it may alternatively be driven by a source of auxiliary power such as hydraulic or electric power. Moreover, means may he provided to discontinue the drive to the pump 4. when the engine is running at such a speed that the centrifugal pump develops sufficient pressure. Under these conditions all the fuel flow to the burner nozzles '7 may pass through the non-return valve 25.
  • Pumping apparatus comprising a centrifugal pump having an inlet arranged for connection with a source of liquid, a valve in the inlet, flow control means operable upon said inlet valve to control the flow of liquid into the centrifugal pump such that the liquid therein forms, when the pump is driven, an annulus whose radial depth controls the pump outlet pressure, positive displacement pump means connected to the outlet of the centrifugal pump and having an outlet for connection with a load at pressure, said pump means including flow-regulating means operable to vary the effective delivery of said pump means when the maximum delivery of which said pump means is capable at a given pump speed exceeds the controlled liquid flow through the centrifugal pump and a movable control member of said flow-regulating means responsive to the fluid pressure across the liquid annulus in the centrifugal pump.
  • Pumping apparatus including a non-return valve arranged in said passage means to open under liquid flow from the outlet to the inlet of the fixed volumetric capacity pump.
  • Pumping apparatus including a non-return valve connected by a bypass passage between the outlet of the centrifugal pump and the outlet of the positive displacement pump means, said non-return valve being arranged to pass excess flow from the centrifugal pump when the controlled flow from the latter exceeds the maximum delivery of the positive displacement pump means at the speed at which the latter is driven.
  • Pumping apparatus comprising a centrifugal pump having an inlet arranged for connection with a source of liquid, a valve including a fluid pressure actuator therefor disposed in the inlet and operable to control the flow of liquid into the centrifugal pump whereby the liquid forms, when the pump is driven, an annulus whose radial depth controls the outlet pressure of the pump with reference to the pressure downstream of the inlet valve, fiow control means including a control member means responsive to the delivery of the centrifugal pump and valve means operatively controlled by said control member and said delivery responsive means, said valve means controlling the fluid pressure actuator whereby the inlet valve -of the centrifugal pump regulates the delivery therefrom to a required value, a positive displacement pump connected to the outlet of the centrifugal pump and having an outlet for connection with a load at pressure, a first by-pass connected between the outlet of the positive displacement pump and the outlet of the centrifugal pump, a throttle valve in said first by-pass including a movable member which is responsive to the pressure developed by the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Feeding And Controlling Fuel (AREA)
US435198A 1964-03-09 1965-02-25 Liquid pumping apparatus Expired - Lifetime US3309995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9868/64A GB1078762A (en) 1964-03-09 1964-03-09 Liquid pumping apparatus

Publications (1)

Publication Number Publication Date
US3309995A true US3309995A (en) 1967-03-21

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ID=9880263

Family Applications (1)

Application Number Title Priority Date Filing Date
US435198A Expired - Lifetime US3309995A (en) 1964-03-09 1965-02-25 Liquid pumping apparatus

Country Status (4)

Country Link
US (1) US3309995A (de)
DE (1) DE1476744C3 (de)
FR (1) FR1426587A (de)
GB (1) GB1078762A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389660A (en) * 1966-08-15 1968-06-25 Greenlee Bros & Co Pump with pressure relief
US3427981A (en) * 1966-01-31 1969-02-18 System Paulin Ab Gear pump with valve mechanism
US3465679A (en) * 1967-09-28 1969-09-09 Cav Ltd Liquid pumping apparatus
US3486458A (en) * 1967-01-06 1969-12-30 Dowty Fuel Syst Ltd Centrifugal pumping apparatus
US3508575A (en) * 1967-11-08 1970-04-28 Dowty Fuel Syst Ltd Liquid supply apparatus
US3532441A (en) * 1968-09-04 1970-10-06 Chandler Evans Inc Pumps with vapor handling element
US3987628A (en) * 1976-03-04 1976-10-26 Deere & Company Charge pump augmenting device
CN103206383B (zh) * 2013-04-11 2015-12-09 南京航空航天大学 带叶轮中心补压调节装置的气心泵
US20180320694A1 (en) * 2015-11-06 2018-11-08 Pierburg Gmbh Control arrangement for a mechanically controllable coolant pump of an internal combustion engine
CN110685915A (zh) * 2019-10-24 2020-01-14 南通冠亚机械科技有限公司 一种涡轮增压空气进气阀及其工作方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1406245A (en) * 1972-01-29 1975-09-17 Lucas Industries Ltd Fuel supply arrangement for a gas turbine engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043367A (en) * 1954-12-27 1962-07-10 Boeing Co Gas turbine engine fuel supply controls

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043367A (en) * 1954-12-27 1962-07-10 Boeing Co Gas turbine engine fuel supply controls

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427981A (en) * 1966-01-31 1969-02-18 System Paulin Ab Gear pump with valve mechanism
US3389660A (en) * 1966-08-15 1968-06-25 Greenlee Bros & Co Pump with pressure relief
US3486458A (en) * 1967-01-06 1969-12-30 Dowty Fuel Syst Ltd Centrifugal pumping apparatus
US3465679A (en) * 1967-09-28 1969-09-09 Cav Ltd Liquid pumping apparatus
US3508575A (en) * 1967-11-08 1970-04-28 Dowty Fuel Syst Ltd Liquid supply apparatus
US3532441A (en) * 1968-09-04 1970-10-06 Chandler Evans Inc Pumps with vapor handling element
US3987628A (en) * 1976-03-04 1976-10-26 Deere & Company Charge pump augmenting device
CN103206383B (zh) * 2013-04-11 2015-12-09 南京航空航天大学 带叶轮中心补压调节装置的气心泵
US20180320694A1 (en) * 2015-11-06 2018-11-08 Pierburg Gmbh Control arrangement for a mechanically controllable coolant pump of an internal combustion engine
US11181112B2 (en) * 2015-11-06 2021-11-23 Pierburg Gmbh Control arrangement for a mechanically controllable coolant pump of an internal combustion engine
CN110685915A (zh) * 2019-10-24 2020-01-14 南通冠亚机械科技有限公司 一种涡轮增压空气进气阀及其工作方法

Also Published As

Publication number Publication date
DE1476744C3 (de) 1975-02-06
DE1476744B2 (de) 1974-06-20
GB1078762A (en) 1967-08-09
DE1476744A1 (de) 1969-07-31
FR1426587A (fr) 1966-01-28

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