US3399625A - Liquid displacement pumps - Google Patents

Liquid displacement pumps Download PDF

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Publication number
US3399625A
US3399625A US574347A US57434766A US3399625A US 3399625 A US3399625 A US 3399625A US 574347 A US574347 A US 574347A US 57434766 A US57434766 A US 57434766A US 3399625 A US3399625 A US 3399625A
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rotor
pump
outlet
piston
liquid displacement
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Expired - Lifetime
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US574347A
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Skinner Robert Thomas John
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ZF International UK Ltd
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Lucas Industries Ltd
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    • 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
    • F04D15/0027—Varying behaviour or the very pump
    • F04D15/0033—By-passing by increasing clearance between impeller and its casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps

Definitions

  • LIQUID DISPLACEMENT PUMPS Filed Aug. 25, 1966 United States Patent 3,399,625 LIQUID DISPLACEMENT PUMPS Robert Thomas John Skinner, Kenilworth, England, assignor to Joseph Lucas (Industries), Limited, Birmingham, England, a British company Filed Aug. 23, 1966, Ser. No. 574,347 2 Claims. (Cl.
  • a liquid displaceemnt pump comprising a body with an interior cavity, a bladed rotor in the cavity, an inlet and an outlet at positions spaced around the rotor periphery, a part annular recess in the wall of the cavity extending around the rotor periphery between the inlet and outlet, a piston defining the base of the recess, and means responsive to the pressure in the pump outlet for moving the piston to vary the volume of the recess.
  • This invention relates to liquid displacement pumps of the kind having a body, a bladed rotor mounted within a cavity in the body, an inlet and an outlet at positions spaced from one another around the rotor, and a partannular recess defined in the wall of the cavity in the body, said recess extending around the periphery of the rotor between the position of the inlet and that of the outlet.
  • the object of the present invention is to provide a liquid displacement pump of the kind specified in a convenient form.
  • a liquid displacement pump has the base of the part annular recess and movable towards and away from the rotor, and liquid pressure operable means responsive to the pressure of liquid in the pump outlet for moving said piston towards the rotor to reduce the volume of the recess.
  • FIGURE 1 is a cross-sectionable view of a pump to which the invention is applied.
  • FIGURE 2 is a fragmentary view of part of the pump illustrating one form of the invention.
  • FIGURES 3 and 4 show alternative controls for the pump.
  • FIGURE 1 there is provided a liquid displacement pump which is suitable for supplying fuel to an internal combustion engine.
  • the pump has a body which defines a generally cylindrical internal cavity 11 within which is mounted a bladed rotor 12 connected to a shaft 13 which can be driven by the engine to which the pump is intended to supply fuel.
  • the rotor blades in this example, extend radially and can sweep the whole of the cavity 11, and in the cylindrical wall are a pair of diametrically opposite tangential outlets one of which is shown at 9.
  • One side wall of the cavity 11 is formed by an inlet plate 14 defining a pair of inlet openings 15 which communicates through an impeller 15a with an inlet port 16 formed in a part 17 secured to the pump body 10.
  • the inlets 15 are spaced angularly from the outlets 9 respectively.
  • the opposite side wall of the cavity 11 has an annular recess 18 of channel shape in cross-section and this is divided by a pair of fixed abutments 19a into a pair of semi-circular recesses, each of which extends between the position of one of the inlets and that of an associated outlet, the recess 18 being at the outer edge of the cavity 11 and the radial width of the recess 18 being approximately a quarter of the radius of the rotor 12.
  • the base walls of the portions of recess 18 are formed by the crown of an annular piston 19 disposed in an annular chamber 20 within the body 10, the piston 19 having two cavities 19b in its crown for accommodation of the fixed abutments 19a.
  • a by-pass passage 21 including a fixed restrictor 22, the passage 21 communicating with two further passages 23, 24, one of which leads to the space at the opposite end of the piston 19 from the rotor 12, and the other of which leads to an outlet 25 controlled by a member 26, the pressure in the passage 23 thus determining the movement of the piston 19 to reduce the volume of the recess 18.
  • the forces acting upon the piston to maintain it at the extremity of its travel remote from the rotor 12 are provided by springs 19c and by the pressure of liquid in the recesses between the inlets and outlets, the latter pressure increasing from the inlet to the outlet in each case.
  • Cam means 26a is provided for controlling the member 26.
  • FIGURE 3 shows an alternative form of control in which the by-pass passage 21 from the pump outlet has a discharge orifice 27 arranged adjacent to a receiving orifice 28 at the end of the passage 23 to the chamber 20 behind the piston 19. Between the two orifices 27, 28 is a knife 29, the position of which is controlled as desired by an external cam means 29a against a spring 30. The orifices 27, 28 are disposed in an enclosure 31 having a drain passage 32.
  • FIGURE 4 a further form of control in which the by-pass passage 21 from the pump outlet communicates, at the point of pivotal mounting, with the interior of a hollow lever 33.
  • This lever is controlled against a spring 34 by a cam 35 and arm 35a.
  • a discharge nozzle 36 at the free end of the lever 33 is arranged to discharge into a receiving nozzle 37 at the end of the passage 23 leading to the chamber 20.
  • the parts are disposed in an enclosure 38 having a drain passage 39. It will be understood that other forms of control can be used to obtain similar results.
  • the control of the member 26, the knife 29 or the lever 33 can be achieved by any suitable parameter or manually as desired.
  • a liquid displacement pump having a body, a bladed rotor mounted within a cavity in the body, an inlet and an outlet at positions spaced from one another around the rotor, a part annular recess defined in the wall of the cavity in the body, said recess extending around the periphery of the rotor between the position of the inlet and that of the outlet, a piston defining the base of the part annular recess and movable towards and away from the rotor, and liquid pressure operable means responsive to the pressure of liquid in the pump outlet for moving said piston towards the rotor to reduce the volume of the References Cited mess- UNITED STATES PATENTS 2.
  • a liquid displacement pump as claimed in claim 1 in which the liquid pressure operable means comprises 1768242 6/1930 Ferguson 103 96 a control whereby the pressure in a chamber at the side 5 2,039,815 5/1936 Lupter 1O396 of the piston remote from the rotor can be varied in ac- 2,957,424 10/1960 Brundage 103-97 cordance with the pressure in the pump outlet and also I accordance with at least one other factor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Sept. 3, 1968 T. J. SKINNER 3,399,625
LIQUID DISPLACEMENT PUMPS Filed Aug. 25, 1966 United States Patent 3,399,625 LIQUID DISPLACEMENT PUMPS Robert Thomas John Skinner, Kenilworth, England, assignor to Joseph Lucas (Industries), Limited, Birmingham, England, a British company Filed Aug. 23, 1966, Ser. No. 574,347 2 Claims. (Cl. 103-97) ABSTRACT OF THE DISCLOSURE A liquid displaceemnt pump comprising a body with an interior cavity, a bladed rotor in the cavity, an inlet and an outlet at positions spaced around the rotor periphery, a part annular recess in the wall of the cavity extending around the rotor periphery between the inlet and outlet, a piston defining the base of the recess, and means responsive to the pressure in the pump outlet for moving the piston to vary the volume of the recess.
This invention relates to liquid displacement pumps of the kind having a body, a bladed rotor mounted within a cavity in the body, an inlet and an outlet at positions spaced from one another around the rotor, and a partannular recess defined in the wall of the cavity in the body, said recess extending around the periphery of the rotor between the position of the inlet and that of the outlet.
The object of the present invention is to provide a liquid displacement pump of the kind specified in a convenient form.
A liquid displacement pump according to the present invention has the base of the part annular recess and movable towards and away from the rotor, and liquid pressure operable means responsive to the pressure of liquid in the pump outlet for moving said piston towards the rotor to reduce the volume of the recess.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIGURE 1 is a cross-sectionable view of a pump to which the invention is applied.
FIGURE 2 is a fragmentary view of part of the pump illustrating one form of the invention.
FIGURES 3 and 4 show alternative controls for the pump.
In the example shown in FIGURE 1 there is provided a liquid displacement pump which is suitable for supplying fuel to an internal combustion engine. The pump has a body which defines a generally cylindrical internal cavity 11 within which is mounted a bladed rotor 12 connected to a shaft 13 which can be driven by the engine to which the pump is intended to supply fuel. The rotor blades, in this example, extend radially and can sweep the whole of the cavity 11, and in the cylindrical wall are a pair of diametrically opposite tangential outlets one of which is shown at 9.
One side wall of the cavity 11 is formed by an inlet plate 14 defining a pair of inlet openings 15 which communicates through an impeller 15a with an inlet port 16 formed in a part 17 secured to the pump body 10. The inlets 15 (one of which is shown only) are spaced angularly from the outlets 9 respectively.
The opposite side wall of the cavity 11 has an annular recess 18 of channel shape in cross-section and this is divided by a pair of fixed abutments 19a into a pair of semi-circular recesses, each of which extends between the position of one of the inlets and that of an associated outlet, the recess 18 being at the outer edge of the cavity 11 and the radial width of the recess 18 being approximately a quarter of the radius of the rotor 12.
The base walls of the portions of recess 18 are formed by the crown of an annular piston 19 disposed in an annular chamber 20 within the body 10, the piston 19 having two cavities 19b in its crown for accommodation of the fixed abutments 19a.
Communicating with the outlets 9 of the pump is a by-pass passage 21 including a fixed restrictor 22, the passage 21 communicating with two further passages 23, 24, one of which leads to the space at the opposite end of the piston 19 from the rotor 12, and the other of which leads to an outlet 25 controlled by a member 26, the pressure in the passage 23 thus determining the movement of the piston 19 to reduce the volume of the recess 18. The forces acting upon the piston to maintain it at the extremity of its travel remote from the rotor 12 are provided by springs 19c and by the pressure of liquid in the recesses between the inlets and outlets, the latter pressure increasing from the inlet to the outlet in each case.
By varying the setting of the member 26, the movement of the piston can be varied in accordance with requirements. Cam means 26a is provided for controlling the member 26.
FIGURE 3 shows an alternative form of control in which the by-pass passage 21 from the pump outlet has a discharge orifice 27 arranged adjacent to a receiving orifice 28 at the end of the passage 23 to the chamber 20 behind the piston 19. Between the two orifices 27, 28 is a knife 29, the position of which is controlled as desired by an external cam means 29a against a spring 30. The orifices 27, 28 are disposed in an enclosure 31 having a drain passage 32.
In FIGURE 4 is shown a further form of control in which the by-pass passage 21 from the pump outlet communicates, at the point of pivotal mounting, with the interior of a hollow lever 33. This lever is controlled against a spring 34 by a cam 35 and arm 35a. A discharge nozzle 36 at the free end of the lever 33 is arranged to discharge into a receiving nozzle 37 at the end of the passage 23 leading to the chamber 20. The parts are disposed in an enclosure 38 having a drain passage 39. It will be understood that other forms of control can be used to obtain similar results. The control of the member 26, the knife 29 or the lever 33 can be achieved by any suitable parameter or manually as desired.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
1. A liquid displacement pump having a body, a bladed rotor mounted within a cavity in the body, an inlet and an outlet at positions spaced from one another around the rotor, a part annular recess defined in the wall of the cavity in the body, said recess extending around the periphery of the rotor between the position of the inlet and that of the outlet, a piston defining the base of the part annular recess and movable towards and away from the rotor, and liquid pressure operable means responsive to the pressure of liquid in the pump outlet for moving said piston towards the rotor to reduce the volume of the References Cited mess- UNITED STATES PATENTS 2. A liquid displacement pump as claimed in claim 1 in which the liquid pressure operable means comprises 1768242 6/1930 Ferguson 103 96 a control whereby the pressure in a chamber at the side 5 2,039,815 5/1936 Lupter 1O396 of the piston remote from the rotor can be varied in ac- 2,957,424 10/1960 Brundage 103-97 cordance with the pressure in the pump outlet and also I accordance with at least one other factor. ROBERT WALKER Prlma'y Examme'
US574347A 1966-08-23 1966-08-23 Liquid displacement pumps Expired - Lifetime US3399625A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219305A (en) * 1978-12-26 1980-08-26 Carrier Corporation Diffuser control
US4257733A (en) * 1978-12-26 1981-03-24 Carrier Corporation Diffuser control
US4460310A (en) * 1982-06-28 1984-07-17 Carrier Corporation Diffuser throttle ring control
EP0707148A1 (en) * 1994-10-13 1996-04-17 Lucas Industries Public Limited Company Pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1768242A (en) * 1927-11-09 1930-06-24 Auto Prime Pump Company Pumping apparatus
US2039815A (en) * 1932-06-04 1936-05-05 James A Lupfer Rotary pump
US2957424A (en) * 1958-11-19 1960-10-25 Gen Motors Corp Centrifugal pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1768242A (en) * 1927-11-09 1930-06-24 Auto Prime Pump Company Pumping apparatus
US2039815A (en) * 1932-06-04 1936-05-05 James A Lupfer Rotary pump
US2957424A (en) * 1958-11-19 1960-10-25 Gen Motors Corp Centrifugal pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219305A (en) * 1978-12-26 1980-08-26 Carrier Corporation Diffuser control
US4257733A (en) * 1978-12-26 1981-03-24 Carrier Corporation Diffuser control
US4460310A (en) * 1982-06-28 1984-07-17 Carrier Corporation Diffuser throttle ring control
EP0707148A1 (en) * 1994-10-13 1996-04-17 Lucas Industries Public Limited Company Pump

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