EP0196469B1 - Electrically-driven fuel feed pump - Google Patents

Electrically-driven fuel feed pump Download PDF

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Publication number
EP0196469B1
EP0196469B1 EP86102686A EP86102686A EP0196469B1 EP 0196469 B1 EP0196469 B1 EP 0196469B1 EP 86102686 A EP86102686 A EP 86102686A EP 86102686 A EP86102686 A EP 86102686A EP 0196469 B1 EP0196469 B1 EP 0196469B1
Authority
EP
European Patent Office
Prior art keywords
pump
shaft
cavity
axial
impeller
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
EP86102686A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0196469A1 (en
Inventor
Roberto De Concini
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.)
Weber SRL
Original Assignee
Weber SRL
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 Weber SRL filed Critical Weber SRL
Publication of EP0196469A1 publication Critical patent/EP0196469A1/en
Application granted granted Critical
Publication of EP0196469B1 publication Critical patent/EP0196469B1/en
Expired 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0076—Fixing rotors on shafts, e.g. by clamping together hub and shaft
    • 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
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units

Definitions

  • This.invention relates to a fuel feed pump of the type comprising an electric motor, a pumping unit driven by this latter, and a casing for supporting said motor and unit.
  • the pumping unit comprises substantially a housing in which an impeller is rotatably mounted-for rotation by a shaft driven by the pump electric motor.
  • This impeller can be of any structure, and can be for example of centrifugal type (ie provided with blades disposed on its most outer peripheral part) or of the roller type (ie provided with a plurality of rollers housed in suitable cavities provided in the most outer peripheral part of the impeller).
  • the pumping unit is in the form of an actual unit separated from the other parts of the pump, in order to be able to test this unit separately from the complete pump and to be able if necessary to store it during the various pump production stages.
  • this pumping unit is rather complicated because the impeller has to be supported in its housing by suitable pins or by a shaft, and means have to be provided for mechanically connecting the shaft driven by the electric motor to the pump impeller, these normally consisting of couplings, insertion joints or entrainment members of various types.
  • pumps of the described type in which the pumping unit can be constructed separately from the other parts of the pump are constructionally rather complicated because of the large number of component parts, and they require supplementary members for mechanically connecting the pumping unit to the electric motor.
  • these pumps are usually arranged such that the fluid takes a precisely defined path between the low-pressure zone from which it is withdrawn and the high-pressure zone into which it is delivered, and they thus allow only one method of operation.
  • This fluid path can for example be of the type in which the fluid flow traverses that compartment in the pump casing which also houses the electric motor, and thus the fluid inlet is provided in one end of this casing, discharge taking place at the opposite end (pumps in which the electric motor is wetted by the fluid); alternatively, the flow of the fluid pumped by the pump is kept completely separated from the zone in which the electric motor operates (pumps with dry motors).
  • a pump of this second type is described in the US ⁇ A ⁇ 4496297.
  • the pumping unit of this pump comprises a plate and a cover defining a cavity in which is rotatable an impeller driven by a shaft.
  • the pumping unit of this patent is fixed to a casing of an alternating current generator which is, in its turn, driven by the motor of the vehicle; therefore this pump is directed to pump water in the cooling system of a vehicle and the problem of wetting the electric motor does not exist in it.
  • the overall object of the present invention is to provide an electrically-driven fuel feed pump of the initially stated type by which the described drawbacks are obviated.
  • a further object of the invention is to provide a pump of the stated type which allows at least two different methods of operation, one with the fluid flow traversing the inner casing compartment and thus actually wetting the electric motor, and the other with the flow completely external to the pump to thus provide dry operation.
  • a further object of the invention is to provide a pump in which the impeller of the pumping unit is easily and immediately accessible from the outside of the pump.
  • a fuel feed pump comprising an electric motor, a pumping unit driven by said electric motor, and a casing for supporting said motor and said unit, said pumping unit comprising a housing in which an impeller is rotatable for rotation by a shaft driven by said electric motor, characterised in that said pumping unit comprises:
  • Said housing is fixed to one end of the casing in such a manner as to close the compartment defined inside this latter, and said annular support element comprises a sleeve which is forced into an axial bore of the housing, and of which the outer surface constitutes said cylindrical support surface.
  • the insertion-joint means conveniently comprise a series of axial grooves provided in an axial bore through the impeller, and a series of axial projections formed on the end of the shaft and arranged to engage with said. grooves.
  • the fuel feed pump according to the invention comprises substantially an electric motor, not shown in the figures for simplicity, for driving a shaft 1 and disposed in a casing 2 of any shape, for example cylindrical, and a pumping unit 3 to be driven by the shaft 1.
  • the shaft 1 can be supported in the casing in any convenient manner and comprise bearings of any type.
  • the pumping unit 3 comprises a housing 4 in which there is rotatable an impeller 5 which can be of any shape and comprise for example a plurality of blades disposed on the peripherally most outer part (centrifugal impeller) or a plurality of radial cavities in which rollers are housed (roller impeller).
  • an impeller 5 which can be of any shape and comprise for example a plurality of blades disposed on the peripherally most outer part (centrifugal impeller) or a plurality of radial cavities in which rollers are housed (roller impeller).
  • said housing comprises substantially a pair of flat plates 6 and 7 between which a spacer ring 8 is disposed. These parts, which are fixed together for example by screws 9, define substantially a cylindrical cavity 10 housing the impeller 5.
  • the pumping unit comprises an annular support element 13 rigid with the housing 4 and provided with at least one cylindrical support surface 14 arranged to engage a corresponding cylindrical surface 15 of the impeller in orderto support the rotating impeller in the housing.
  • the support element 13 consists of a sleeve, the outer cylindrical surface of which is forced into the cylindrical surface 16 of an axial bore provided in the plate 6, as can be clearly seen in Figure 1.
  • that cylindrical surface 15 of the impeller 5 which engages under rotation with the surface 14 of said sleeve is obtained by means of a cylindrical cavity formed in the hub part of the impeller.
  • the impeller 5 and the end 17 of the shaft 1 are provided with insertion-joint means able to make the shaft torsionally rigid with the impeller.
  • These means comprise substantially a series of axial cavities 18 formed in a bore of the impeller 5, and a series of corresponding axial projections 19 provided on the end 17 of the shaft 1 and arranged to engage with the preceding.
  • a conical seat 20 arranged to house a ball 21, which is interposed between said seat and a substantially flat surface 22 provided in a cavity of the plate 7. This ball is therefore able to act as a thrust bearing for the shaft 1, in order to support the axial loads transmitted to it which tend to displace the shaft towards the right in the figure.
  • the plate is provided with a sleeve 23 projecting axially towards the pump electric motor, and inside which a bearing 24 can be housed to support the end 17 of the shaft 1.
  • This bearing which can be of any suitable type, is inserted into the same cylindrical surface 16 into which the support element 13 is forced.
  • the pumping unit 3 is connected to the pump casing 2 by fixing the plate 6 to one end of the casing in any suitable manner.
  • This fixing can be carried out for example in the manner shown in Figure 1, by providing a shoulder 25 on the casing against which the plate 6 is rested, and then turning-over on to it the end edge 26 of the casing. Conveniently, a seal ring 27 is disposed between the plate and casing.
  • the pumping unit 3 completely seals one end of the pump casing, and all its parts, with the exception of the plate 6, are external to the casing and completely accessible.
  • Axial ports, 30 and 31 respectively, are conveniently provided in the plates 7 and 6to allowthe fuel to be fed into the cavity 10 of the pumping unit 3 and to be delivered under pressure from said cavity into the compartment 32 provided in the pump casing 2.
  • This constructional arrangement therefore provides a method of pump operation in which the fluid flow traverses the compartment 32 housing the motor, to wet the motor and leave from the other end of the pump.
  • a further series of axial ports 33 provided in the plates 6 and 7 and in the spacer ring 8 enables the fuel to pass between the compartment32 and the outside of the pump, along this path there being provided a pressure relief valve.
  • the pumping unit of the embodiment shown in Figure 2 differs from the preceding only in the structure of the plate 7.
  • This latter comprises at least two ports 34 and 35 arranged respectively to feed fuel into the cavity 10 and to deliver it under pressure from said cavity to the user item.
  • a further bore 36 connects together the two preceding ports, and along it there is disposed a pressure relief valve 37.
  • ports are not provided in the plate 6, and thus the compartment 32 in the casing 2 housing the electric motor is completely separated from the fuel flow.
  • a substantially cylindrical cavity 38 housing seal rings 39 arranged to form a hydraulic seal against the cylindrical surface of the end 17 of the shaft 1.
  • Said rings can conveniently be of rubber, and be provided with radial lips which slide along said surface. These can be mounted in any convenient manner, for example against a shoulder of the support element 13, by using a spacer 40 and a stop ring 41.
  • a radial bore 42 in communication with grooves 43 of the plate 6, in order to form a channel between the cavity lying between the seal rings 39 and the pump cavity 10.
  • the construction and use of the described pump can be as follows.
  • the pumping unit of any of the illustrated embodiments can be constructed separately from the other parts of the pump. For this purpose, it is necessary only to firstly mount the support element 13 in the bore 16 of the plate 6, then engage the impeller 5 with this support element, and finally fix the spacer ring 8 and the other plate 7 on the plate 6 by means of the screws 9, to form the housing for the unit. It is apparent that in the pumping unit obtained in this manner the impeller 5 is supported correctly in the housing and perfectly coaxial to it. Under these conditions, the pumping unit can be tested by using suitable drive means, for example a shaft on the end of which axial projections are provided of the same type as those provided on the end 17 of the shaft 1, and able to engage the axial cavities 18 of the impeller 5.
  • suitable drive means for example a shaft on the end of which axial projections are provided of the same type as those provided on the end 17 of the shaft 1, and able to engage the axial cavities 18 of the impeller 5.
  • the pumping unit thus prepared can be stored for use when the pump is to be completely assembled. For this latter, it is necessary only to mount the bearing 24 on the plate 6 of said unit, and fix the plate to the casing 2 in the manner shown in the figures.
  • the end 17 of the shaft 1 is then inserted into the bearing and support element 13 until the axial projections 19 engage the corresponding axial cavities 18 of the impeller. This operation thus results simultaneously in the electric motor becoming mechanically connected to the impeller 5, one end of the shaft 1 becoming supported by the bearing 24, and one end of the pump casing 2 becoming sealed.
  • any one of the pumping units of the embodiments of the illustrated figures can be constructed, to thus obtain a fuel flow which either completely traverses the pump or is entirely external to the compartment 32 housing the electric motor.
  • the support element 13 provided with a cylindrical support surface 14 for the impeller 5 can be formed in a different manner.
  • This surface could for example be provided directly on an annular projection projecting axially from the circular plate 6, or by providing a support element 13 which is of a shape different from that illustrated and is connected to the plate by a different method, Instead of being connected to the plate 6, this support element could be connected to the plate 7 by obvious structural modifications.
  • the insertion-joint means for torsionally connecting the end of the shaft 1 to the impeller 5 could be of a type different from those shown, and instead of comprising axial projections and cavities could comprise entrainment members of a different type, for example frontal teeth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP86102686A 1985-03-22 1986-03-01 Electrically-driven fuel feed pump Expired EP0196469B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67281/85A IT1184924B (it) 1985-03-22 1985-03-22 Pompa di alimentazione del combustibile ad azionamento elettrico
IT6728185 1985-03-22

Publications (2)

Publication Number Publication Date
EP0196469A1 EP0196469A1 (en) 1986-10-08
EP0196469B1 true EP0196469B1 (en) 1990-02-07

Family

ID=11301109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102686A Expired EP0196469B1 (en) 1985-03-22 1986-03-01 Electrically-driven fuel feed pump

Country Status (6)

Country Link
EP (1) EP0196469B1 (pt)
BR (1) BR8601540A (pt)
DE (1) DE3668952D1 (pt)
ES (1) ES8701903A1 (pt)
IT (1) IT1184924B (pt)
SU (1) SU1512493A3 (pt)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1196885B (it) * 1986-12-30 1988-11-25 Weber Srl Pompa elettrica per il carburante
DE3772386D1 (de) * 1987-06-23 1991-09-26 Schwaebische Huettenwerke Gmbh Innenzahnradpumpe als schmieroelpumpe.
GB9106807D0 (en) * 1991-04-02 1991-05-22 Concentric Pumps Ltd Oil pumps
GB2394007A (en) * 2002-10-10 2004-04-14 Compair Uk Ltd Oil sealed rotary vane compressor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565550A (en) * 1968-12-10 1971-02-23 Worthington Corp Compressor and pump combination
FR2220688B1 (pt) * 1973-03-09 1976-10-08 Rondolino Giorgio
US4445820A (en) * 1980-12-27 1984-05-01 Aisan Kogyo Kabushiki Kaisha Electrically powered pump
US4496297A (en) * 1981-06-02 1985-01-29 Mitsubishi Denki Kabushiki Kaisha Rotary vane pump with overlapping rotor and housing portions

Also Published As

Publication number Publication date
ES553281A0 (es) 1986-12-01
IT8567281A1 (it) 1986-09-22
DE3668952D1 (de) 1990-03-15
IT1184924B (it) 1987-10-28
IT8567281A0 (it) 1985-03-22
EP0196469A1 (en) 1986-10-08
SU1512493A3 (ru) 1989-09-30
ES8701903A1 (es) 1986-12-01
BR8601540A (pt) 1986-12-09

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