EP1074509A1 - Soupape secondaire - Google Patents

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Publication number
EP1074509A1
EP1074509A1 EP00850132A EP00850132A EP1074509A1 EP 1074509 A1 EP1074509 A1 EP 1074509A1 EP 00850132 A EP00850132 A EP 00850132A EP 00850132 A EP00850132 A EP 00850132A EP 1074509 A1 EP1074509 A1 EP 1074509A1
Authority
EP
European Patent Office
Prior art keywords
fuel
pump
conduit
fuel conduit
primary
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.)
Ceased
Application number
EP00850132A
Other languages
German (de)
English (en)
Inventor
Bengt I. Larsson
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.)
Wayne Fueling Systems Sweden AB
Original Assignee
Dresser Wayne AB
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 Dresser Wayne AB filed Critical Dresser Wayne AB
Publication of EP1074509A1 publication Critical patent/EP1074509A1/fr
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
    • B67D7/0476—Vapour recovery systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/06—Details or accessories
    • B67D7/36—Arrangements of flow- or pressure-control valves

Definitions

  • the present invention relates to a fuel pump unit for dispensing fuel from a fuel container.
  • a primary fuel conduit is connected to the fuel container.
  • a motor, a pump means arranged in a pump housing and a metering means are arranged in connection with the primary fuel conduit.
  • a delivery nozzle is arranged at the discharge end of the fuel conduit to be used when filling the tank of a vehicle. While filling a tank, the fuel is pumped through the primary fuel conduit and the metering means arranged therein, and out through the delivery nozzle.
  • the invention relates to a method for performing circulation of fuel in a fuel pump unit according to appended claim 10.
  • Fuel pump units of the type mentioned by way of introduction are today available at petrol stations to allow the tank of a vehicle to be filled.
  • the manufacturers of such fuel pump units continuously strive to simplify the construction and minimise the costs of the fuel pump units.
  • valves such as non-return valves and solenoid valves are arranged in the primary fuel conduit of the fuel pump unit.
  • the fuel flow rate is checked and pressure spikes are prevented, which arise owing to quick regulation of the delivery nozzle, in the primary fuel conduit by arranging a pressure-controlled safety valve in connection with the primary fuel conduit.
  • the safety valve is arranged in a secondary fuel conduit also called bypass conduit and connected to the primary fuel conduit to enable circulation of fuel about the pump means as the pressure in the fuel conduit becomes too high when dispensing fuel.
  • the bypass is normally connected to a chamber down stream of the fuel pump in which chamber fuel is gathered after the removal of air.
  • a fuel pump unit In EP-0 440 845-A1 a fuel pump unit is described.
  • one fuel pump serves two or more delivery nozzle assemblies.
  • the fuel pump with a motor is dimensioned to be able to provide all the delivery nozzle assemblies with fuel during dispensing. If not all pump assemblies are used for dispensing fuel the pumping capacity of the fuel pump is altered to avoid large volumes of fuel being circulated through the fuel pump via the bypass and a safety valve.
  • To use a fuel pump with an adjustable capacity makes the construction complex and costly.
  • FR 2 527 195 another fuel pump unit is described.
  • a by-pass with a pressure-controlled valve is arranged in conjunction with a fuel pump, which eliminates any build up of pressure when the dispensing of fuel is stopped.
  • the fuel pump with motor is only in a conventional manner connected to one pump assembly.
  • bypass conduit is formed in the pump housing and extends from the pump means to a point upstream of the pump means.
  • VPR system Vapour Recovery System
  • a drawback of the technique described above is that the fuel which is not dispensed and instead is circulated is heated during circulation. If the temperature of the fuel rises too much, there is a risk of the fuel gasifying or being ignited. Especially in the warm months of the year, heating of the fuel causes problems. Moreover much power is required to circulate the fuel.
  • One object of the present invention is to provide an improved fuel pump unit and an improved method of pumping fuel in a fuel pump unit, which obviate the above problems.
  • a further object of the present invention is to achieve a lower temperature in the fuel pump unit.
  • the invention is based on, inter alia, a plurality of pump assemblies or one pump assembly and one gas recirculating means in a fuel pump unit being directly connected to a common motor.
  • a secondary valve in each pump assembly is arranged in a secondary fuel conduit to be opened and closed, respectively, when the dispensing of fuel from the delivery nozzle is finished and initiated, respectively.
  • the secondary valve is controlled independently of the state of a safety valve, which is connected to the primary fuel conduit to eliminate pressure spikes therein.
  • the first connection of the secondary conduit is connected at a distance from the pump housing.
  • the second connection can advantageously be connected at a distance from the pump housing. This means in both cases that the length of the secondary conduit increases, which results in improved cooling of the pump means since a large volume of fuel passes through the pump means.
  • the secondary valve preferably having a smaller pressure drop in relation to the safety valve as fuel passes therethrough, a low power consumption is achieved when circulating the fuel.
  • a control device is connected to the secondary valve to open and close it owing to a change in, for instance, temperature, flow rate, pressure or the position of the delivery nozzle in the fuel pump unit.
  • the secondary fuel conduit By arranging the secondary fuel conduit in a heat exchanging relationship with a pump housing or primary fuel conduit of a neighbouring second pump assembly, a cooling effect on the circulated fuel is advantageously achieved.
  • the cooling effect is obtained as the cold fuel from the tank is dispensed from the second pump assembly.
  • Fig. 1 is a schematic view of a fuel pump unit according to a first embodiment of the invention.
  • Fig. 2 is a schematic view of a fuel pump unit according to a second embodiment of the invention.
  • Fig. 3 is a schematic view of a portion of a fuel pump unit according to a third embodiment of the invention.
  • the fuel pump unit 1 has, as shown in Fig. 1, a fuel container 2. It also has a motor 3 which simultaneously operates at least two pump assemblies 4, or one pump assembly 4 and one gas recirculating means 5.
  • a primary fuel conduit 6 extends from the container 2 to at least one delivery nozzle 7.
  • a pump means 9 arranged in a pump housing 8, which also belong to the pump assembly 4.
  • the pump means 9 is directly connected to the motor 3 via a shaft which is common to a plurality of pump assemblies 4 or one pump assembly 4 and one gas recirculating means 5.
  • pump means relates to a rotor 10 and the inner surface 11 of the pump housing 8 round the rotor 10.
  • At least one metering means 12 is arranged in connection with the primary fuel conduit 6 which can be branched, to meter the dispensed volume of fuel from the pump assembly 4.
  • a so-called filter element 13 is arranged between the fuel container 2 and the pump means 9 to filter the fuel.
  • a non-return valve (not shown) can also be arranged in the primary fuel conduit 6 downstream of the pump means to prevent the fuel from flowing back to the container 2.
  • a safety valve 20 is arranged in connection with the primary fuel conduit 6 to absorb great pressure surges caused in the pump assembly 4 in case of quick changes in the dispensing capacity.
  • the safety valve 20 is pressure-controlled and arranged, for instance, in a separate bypass duct 21. By the safety valve 20 being pressure-controlled, it has very short reaction times and opens as soon as the pressure in the assembly 4 exceeds a predetermined level.
  • the separate duct 21 can be connected to the primary fuel conduit 6 upstream and downstream of the pump means 9.
  • the secondary fuel conduit 15 is connected to the primary fuel conduit 6 by means of a first connection 16 upstream of the pump means 9 and a second connection 17 downstream of the pump means 9.
  • the secondary fuel conduit 15 can be arranged, for instance, in the pump housing 8.
  • a secondary valve 18 is arranged in the secondary fuel conduit 15 to allow or prevent the flow of fuel therein.
  • the secondary valve 18 is controlled with the aid of intelligent control based on, for example, the flow in the fuel conduit 3 from the container and out through the delivery nozzle 7.
  • the secondary valve 18 has a small pressure drop in its open state. Owing to the small pressure drop in the secondary valve 18, a small amount of power is required to circulate the fuel through the secondary conduit 15, which results in a smaller amount of energy being supplied to the fuel that is being circulated. In its fully closed state, the secondary valve 18 does not allow fuel to pass into the secondary fuel conduit 15. Fuel is then dispensed through the delivery nozzle at a maximum capacity. In case of a pump assembly 4 idling, which means that fuel is merely circulated and not dispensed, the secondary valve 18 is essentially fully open. When fuel has begun to flow in the primary fuel conduit 6 downstream of the second connection 17, the secondary valve 18 closes.
  • the first and/or the second connection 16, 17 are connected at a distance from the pump housing 8 to increase the length of the secondary fuel conduit 15.
  • the first and the second connection 16, 17 are connected to the primary fuel conduit 6 at a maximum distance from the pump means 9.
  • the length of the conduit between the second connection 17 and the metering means 12 can be smaller than the length of the conduit between the second connection 17 and the pump means 9.
  • the second connection 17 is advantageously arranged just before the metering means 12.
  • the first connection 16 can be connected immediately downstream of the filter element 13 so as to prevent the fuel from being filtered once more.
  • the increased length of the secondary conduit 15 implies that an increased amount of fuel is circulated, which results in a low average temperature of the circulated fuel.
  • the secondary conduit 15 or the pump housing 8 in a first pump assembly 4a is arranged in a heat exchanging relationship with the primary fuel conduit or the pump housing in a neighbouring second pump assembly 4b. This results in a cooling effect on the circulated fuel in the first pump assembly 4a from a fuel that is being dispensed through the second pump assembly 4b.
  • control device 19 In connection with the secondary valve 18 there is arranged in the embodiments a control device 19 to control the secondary valve 18.
  • the control device 19 can, for instance, by means of mechanical motions or electrical signals control the secondary valve 18.
  • the control device 19 is in the preferred embodiment connected to the secondary valve 18 to open and close the valve 18 in dependence on the flow rate in the primary fuel conduit 6 downstream of the second connection 17, the valve 18 opening in case of a decreased dispensing flow rate and closing in case of an increased dispensing flow rate.
  • the control device 19 transmits an opening signal to the secondary valve 18. This opening of the secondary valve 18 enables circulation of the fuel in the secondary fuel conduit 15 at a small pressure drop.
  • the control device 19 transmits a closing signal to the secondary fuel conduit 15 and, consequently, the supply of fuel to the secondary fuel conduit 15 decreases.
  • control device 19 may comprise a pilot magnet 22 arranged in the primary fuel conduit.
  • the pilot magnet 22 is displaced because of the flow of fuel in the primary fuel conduit 6.
  • a change in temperature would change the position/ size of a component in the control device 19 and result in opening or closing of the valve 18.
  • the secondary fuel conduit 15 with the secondary valve 18 can be used to control the dispensed flow from the primary fuel conduit 6 since the pump means 9 is usually operated at a constant speed. Then the opening and closing of the secondary valve 18 is controlled continuously so as to obtain the desired dispensed flow out of the delivery nozzle 7.
  • control device 19 could control the secondary valve 18 depending on whether the delivery nozzle 7 is used or not, i.e. whether the nozzle is raised from its resting position in the fuel pump unit 1 or not.
  • the safety valve 20 could be arranged in parallel with the secondary valve 18 in the secondary fuel conduit 15.
  • the safety valve 20 need not be a valve but can consist of a damper such as a chamber having a yieldable wall which can absorb pressure surges but at the same time not independently allow circulation of the fuel.
  • Many types of valves which have a small pressure drop in their open state other than those described above could be used to utilise the present invention.
  • pump means 9 can be arranged in series after the motor 3 or on both sides of the motor 3, or be arranged in independent or common pump housings to achieve the desired effects according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP00850132A 1999-08-05 2000-08-04 Soupape secondaire Ceased EP1074509A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9902844A SE9902844L (sv) 1999-08-05 1999-08-05 Sekundärventil
SE9902844 1999-08-05

Publications (1)

Publication Number Publication Date
EP1074509A1 true EP1074509A1 (fr) 2001-02-07

Family

ID=20416620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00850132A Ceased EP1074509A1 (fr) 1999-08-05 2000-08-04 Soupape secondaire

Country Status (2)

Country Link
EP (1) EP1074509A1 (fr)
SE (1) SE9902844L (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090734A (en) * 1935-01-19 1937-08-24 Piquerez Emile Device for filling tanks with hydrocarbons
US4223706A (en) 1978-06-08 1980-09-23 Texaco Inc. Closed fuel system with vacuum assist
US4260000A (en) * 1979-06-04 1981-04-07 Texaco Inc. Fuel dispensing system with controlled vapor withdrawal
FR2527195A1 (fr) 1982-05-21 1983-11-25 Satam Ind Perfectionnements aux dispositifs de distribution de carburant
EP0440845A1 (fr) 1990-02-07 1991-08-14 Scheidt & Bachmann Gmbh Système de distribution pour carburants liquides
US5123817A (en) * 1989-08-11 1992-06-23 Koppens Automatic Fabrieken B.V. Vapor exhaust system
DE4202873A1 (de) * 1991-02-03 1993-08-05 Fritz Curtius Verfahren zur regelung der rueckfuehrung des benzindampf-/luftgemisches beim tanken

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090734A (en) * 1935-01-19 1937-08-24 Piquerez Emile Device for filling tanks with hydrocarbons
US4223706A (en) 1978-06-08 1980-09-23 Texaco Inc. Closed fuel system with vacuum assist
US4260000A (en) * 1979-06-04 1981-04-07 Texaco Inc. Fuel dispensing system with controlled vapor withdrawal
FR2527195A1 (fr) 1982-05-21 1983-11-25 Satam Ind Perfectionnements aux dispositifs de distribution de carburant
US5123817A (en) * 1989-08-11 1992-06-23 Koppens Automatic Fabrieken B.V. Vapor exhaust system
EP0440845A1 (fr) 1990-02-07 1991-08-14 Scheidt & Bachmann Gmbh Système de distribution pour carburants liquides
DE4202873A1 (de) * 1991-02-03 1993-08-05 Fritz Curtius Verfahren zur regelung der rueckfuehrung des benzindampf-/luftgemisches beim tanken

Also Published As

Publication number Publication date
SE9902844D0 (sv) 1999-08-05
SE9902844L (sv) 2001-02-06

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