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EP0486910A1 - Dispositif de récupération de vapeurs de carburant - Google Patents

Dispositif de récupération de vapeurs de carburant Download PDF

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Publication number
EP0486910A1
EP0486910A1 EP91119132A EP91119132A EP0486910A1 EP 0486910 A1 EP0486910 A1 EP 0486910A1 EP 91119132 A EP91119132 A EP 91119132A EP 91119132 A EP91119132 A EP 91119132A EP 0486910 A1 EP0486910 A1 EP 0486910A1
Authority
EP
European Patent Office
Prior art keywords
jet pump
line
liquid separator
suction
inlet
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.)
Withdrawn
Application number
EP91119132A
Other languages
German (de)
English (en)
Inventor
Klaus Nitsche
Horst Grindler
Mirjam Maiberger
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.)
Duerr Dental SE
Original Assignee
Duerr Dental SE
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 Duerr Dental SE filed Critical Duerr Dental SE
Publication of EP0486910A1 publication Critical patent/EP0486910A1/fr
Withdrawn legal-status Critical Current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
    • B67D7/0476—Vapour recovery systems
    • B67D7/0478—Vapour recovery systems constructional features or components
    • B67D7/0488—Means for preventing the formation of condensation on, or for removing condensation from, vapour recovery lines

Definitions

  • the invention relates to a device for returning gasoline vapors from a fuel nozzle to a gas tank according to the preamble of claim 1.
  • suction machine is generally to be understood as a gas-extracting machine from which liquid petrol must be kept away to ensure trouble-free continuous operation, in particular reciprocating compressors, membrane compressors, Rootes pumps, and rotary vane compressors and other rotary piston machines.
  • the present invention is intended to develop a device for recycling gasoline vapors in accordance with the preamble of claim 1 in such a way that even larger liquid gasoline components carry vapors with them in the long term can be returned from the nozzle to the fuel tank without any problems.
  • the return device In the return device according to the invention, one has a liquid separator upstream of the actual suction machine, and the liquid petrol that accumulates there is conveyed back into the petrol tank using a jet pump. This is operated directly by the gas flow emitted by the suction machine.
  • the recirculation device In the recirculation device according to the invention, there is thus a bypass for liquid portions of the sucked-in gas, which bypasses around the suction machine, no additional pump having a separate drive and having moving parts being required to convey the liquid through the bypass bypassing the suction machine. Such a pump would significantly increase the long-term susceptibility to faults.
  • liquid gasoline and gasoline vapors from the jet pump can not flow back into the liquid separator if the jet pump, due to low gas throughput, does not generate a vacuum. Under such conditions, one would not have a sufficiently large gas flow in the jet pump to carry liquid quantities arriving there.
  • the suction machine can suck in gas from its delivery side via the pressure relief valve ensures such a large gas basic circuit through the jet pump that it pumps liquid out of the liquid separator sufficiently well, even if the pump with the Nozzle connected to the nozzle connected to the nozzle and receives little gasoline vapors and lots of gasoline droplets.
  • an adjustment of the intensity of the suction to the amount of the fuel supplied in each case via the nozzle valve is obtained automatically.
  • this control signal associated with the suckback flow is obtained in a simple manner without mechanically moving parts or electrical signal transmitters in a form which is advantageous for the direct influence of the regulator element of the pressure regulator.
  • a feedback device is particularly compact, since the suction machine housing which is present anyway can at the same time take over the function of the separator housing.
  • 10 denotes the petrol tank of a petrol station which is normally arranged in the ground. From this sucks a dispenser pump 14 via a line 12. Its delivery side is connected via a line 16 to a nozzle 18, which is only indicated schematically.
  • a rear section of the nozzle nozzle is surrounded by a hollow cylindrical suction part 20, which is provided in its peripheral wall with a plurality of suction openings 22 and the diameter of which is such that it still fits into the tank neck of a vehicle to be refueled with radial play.
  • the interior of the suction part 20 is connected to a return suction line 24.
  • a jet pump 26, which serves as a flow meter, is inserted into the return suction line 24.
  • a pressure regulator 28 is also inserted downstream of the jet pump 26 into the return suction line 24.
  • the movable regulator element of the pressure regulator 28 is biased in the closing direction by a spring 30. In the same direction, the pressure transferred via a control line 34 at the outlet of the dispenser pump 14 acts via a membrane 32.
  • the suction opening of the jet pump 26 is connected to the pressure regulator 28 via a further control line 36.
  • the negative pressure generated by the jet pump 36 also acts in the closing direction of the movable regulator element.
  • the suction line 24 Downstream of the pressure regulator 28, the suction line 24 is connected to the inlet of a schematically represented liquid separator 38.
  • the gas outlet of the liquid separator 38 is connected via a line 40 to the inlet of a compressor 42.
  • Another line 44 which contains a second jet pump 46, connects the outlet of the compressor 42 to a further liquid separator 48.
  • the latter is located below the line 44 and above the gas tank 10.
  • a gas outlet of the liquid separator 48 is via a line containing a further pressure regulator 50 52 connected to the inlet of the liquid separator 38.
  • the opening pressure of the pressure regulator 50 can be varied by adjusting the bias of a spring 54 working on its regulator element. In the opposite direction to the force of the spring 54, the pressure acting in the liquid separator 38 acts on this regulator element.
  • the opening pressure of the pressure regulator 50 is typically about 900 mbar.
  • the suction opening of the jet pump 46 is connected via a further line 56, which has a check valve 58, to the bottom of the liquid separator 38, that is to say to its bottom section.
  • the check valve 58 opens in the direction from the liquid separator 38 to the jet pump 46, and its valve body 60 is biased in the closing direction by a spring 62.
  • a bypass line 64 which contains a further check valve 66, runs over the jet pump 46. This opens in the direction from the compressor 42 to the liquid separator 48. Its valve body 68 is biased into the closed position by a spring 70, the opening pressure typically being 100 mbar.
  • the dispensing valve is removed from the corresponding dispenser of the dispenser, whereby the dispenser pump 14 and the compressor 42 are started (both preferably have a common drive motor).
  • the nozzle valve is still closed, the pressure in line 16 rises sharply, as a result of which pressure regulator 28 is held in the closed position.
  • the compressor 42 receives no gas on the inlet side and thus quickly generates a high negative pressure. This opens the pressure regulator 50 and the compressor 42 now maintains a gas base load flow via the lines 40, 44 and 52. Any quantities of liquid still remaining in the liquid separator 38 from a previous tapping process are sucked off by the jet pump 46.
  • the pressure at the outlet of the pump 14 drops and the pressure regulator 28 regulates strongly.
  • the sucked gasoline vapors get into the liquid separator 38.
  • the negative pressure at the inlet of the compressor 42 now drops and the pressure regulator 50 closes.
  • the Gas stream discharged from the compressor 42 passes through the jet pump 46; a portion that is not necessary for their operation is passed directly to the liquid separator 48 via the check valve 66. Since the pressure regulator 50 has closed, the gasoline vapors get back into the gas tank 10 and thus replace the volume of liquid drawn off from there.
  • the jet pump 46 continuously sucks off any liquid that accumulates in the liquid separator 38.
  • the pressure regulator 28 is closed again somewhat via the ammeter formed by the jet pump 26, so that overall the volume of the gas drawn in by the suction part 20 corresponds to the volume of the liquid dispensed by the nozzle 18.
  • the extracted gas increasingly carries along gasoline droplets, which originate from the gasoline bubbles rising back into the fuel filler neck.
  • the user now throttles the gasoline delivery through the nozzle 18 and temporarily closes it completely.
  • the pressure regulator 28 is then closed more or even completely; the compressor 42 can then maintain a gas base load flow again via the lines 40, 44 and 52, so that the jet pump 46 continues to draw off liquid from the liquid separator 38. This is then separated from the base gas stream in the second liquid separator 48 and returns to the gas tank 10 by gravity.
  • FIGS. 2 to 5 show details of a practical exemplary embodiment for the compressor 42, the liquid separator 38 and the jet pump 46 being integrated in the compressor 42.
  • the compressor 42 has a housing 72 which is closed by a cylinder head unit, designated overall by 76 is. This consists of a valve plate 78 and a head piece 80.
  • a compressor shaft 86 is mounted in the housing 72 via bearings 82, 84.
  • the compressor shaft 86 In the interior of the housing 72, the compressor shaft 86 carries an eccentric 92, which works on a connecting rod 96 via a bearing 94. A piston lower part 98 is formed on its free end. An upper piston part 100 with a screw 102 is firmly placed on the latter, a sealing ring 104 being clamped between the two piston parts.
  • a balancing body 106 is formed on the eccentric 92, which compensates for those unbalances which are attributable to the eccentric, the connecting rod and the piston.
  • the piston runs in a cylinder liner 108, which is attached to the cylinder head unit 76 by screws 110 such that an annular space 112 remains between the inner surface of the housing 72 and the outer surface of the cylinder liner 108.
  • Axial cooling fins 114 are provided on the outside of the cylinder liner 108.
  • An inlet opening 116 of the housing 72 is connected to an inlet channel 118, which runs parallel to the cylinder axis in the direction of the cylinder head unit 76, but ends at a short distance in front of the same. Between the radially inner wall section of the inlet channel 118 and the outside of the cylinder liner 108, there remains a channel 120 which leads away from the head unit 76 parallel to the cylinder axis.
  • an opening 122 is provided in the valve plate 78, which is connected to an intake channel 124 formed in the head piece 80.
  • the gas supplied to the inlet opening 116 must therefore first pass through a baffle formed by the channels 118 and 120 and is also sharply deflected when the housing 72 is passed through further. As a result, liquid droplets contained in the gas stream are separated.
  • an insert body 126 wound from wire mesh is provided in the inlet channel 118.
  • the liquid components separated by the insert body 126 and by baffle action collect at the deepest point of the housing 72. Since the sectional plane of Figure 2 is a horizontal sectional plane, the cylinder head unit 76 extends in the vertical direction, the separated liquid in Figure 2 thus collects below the drawing plane over the wall of the housing 72, designated 128.
  • the end of the suction channel 124 adjacent to the valve plate 78 is closed by a tongue valve body 130 carried by the valve plate 78 and cooperating with the end of the suction channel 124. Behind the tongue valve body 130, the valve plate 78 has a bevel 132, which is connected to a through opening 134 of the valve plate 78, which leads to the working space 136 of the compressor.
  • a further through opening 138 of the valve plate 78 is resiliently closed by a further tongue valve body 140 which is carried by the valve plate 78.
  • the head piece 80 Behind the reed valve body 140, the head piece 80 has a bevel 142 which enables the tongue valve body 140 to be opened in the compression stroke of the piston.
  • the gas displaced from the working space 136 then passes into an outlet channel 144 which is provided in the head piece 80.
  • the jet pump 46 is integrated into the outlet channel 144. It has two axially spaced jet pump parts 146, 148.
  • the space between these jet pump parts is connected to a transverse channel 150, which is connected to a vertically downward channel 152 in the valve plate 78 via the check valve 58, which is designed as a tongue valve and is also accommodated in the head piece 80.
  • the latter leads to a suction bore 154, which opens into the interior of the housing 72 directly above the wall 128.
  • a corresponding channel 156 extends from the channel 150, which ends shortly behind the housing wall opposite the wall 128.
  • the housing 72 is a zinc die-cast part, as is the valve plate 78 and the head piece 80.
  • the part which forms the eccentric 92 and the balancing body 106 is made of brass.
  • Aluminum parts are the connecting rod 96, the piston lower part 98, the piston upper part 100 and the cylinder liner 108.
  • the compressor shaft 86 is made of steel, the piston sealing ring 104 made of PTFE. This choice of materials is advantageous in terms of corrosion resistance and explosion safety.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
EP91119132A 1990-11-22 1991-11-11 Dispositif de récupération de vapeurs de carburant Withdrawn EP0486910A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4037066 1990-11-22
DE19904037066 DE4037066C2 (de) 1990-11-22 1990-11-22 Einrichtung zum Rückführen von Benzindämpfen

Publications (1)

Publication Number Publication Date
EP0486910A1 true EP0486910A1 (fr) 1992-05-27

Family

ID=6418672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119132A Withdrawn EP0486910A1 (fr) 1990-11-22 1991-11-11 Dispositif de récupération de vapeurs de carburant

Country Status (2)

Country Link
EP (1) EP0486910A1 (fr)
DE (1) DE4037066C2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999040022A1 (fr) * 1998-02-04 1999-08-12 Asf Thomas Industries Gmbh Pompe pour refouler un milieu gazeux/liquide
EP1035071A1 (fr) * 1999-03-05 2000-09-13 Marconi Commerce Systems S.r.L. Distributeur de carburant avec dispositif de coupure lors de la présence de liquide dans la conduite de récupération de vapeurs
GB2348417A (en) * 1999-03-31 2000-10-04 Tokheim Services France Vapour recovery system for hydrocarbon dispensers
WO2003064313A3 (fr) * 2002-01-30 2004-02-19 Cleanair As Procede et appareil

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4435976B4 (de) * 1994-10-09 2004-04-08 Dürr Dental GmbH & Co. KG Pumpe zum Fördern von Dämpfen
DE10156759C1 (de) * 2001-11-19 2003-10-30 Knorr Bremse Systeme Kurbeltriebanordnung, insbesondere für eine Verdichtereinheit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3763901A (en) * 1971-01-25 1973-10-09 C Viland Method of preventing loss of hydrocarbons to atmosphere
FR2388762A1 (fr) * 1977-04-25 1978-11-24 Calgon Corp Installation de retour des vapeurs de combustible
US4306594A (en) * 1979-07-19 1981-12-22 Texaco Inc. Vacuum assist fuel system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3763901A (en) * 1971-01-25 1973-10-09 C Viland Method of preventing loss of hydrocarbons to atmosphere
FR2388762A1 (fr) * 1977-04-25 1978-11-24 Calgon Corp Installation de retour des vapeurs de combustible
US4306594A (en) * 1979-07-19 1981-12-22 Texaco Inc. Vacuum assist fuel system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999040022A1 (fr) * 1998-02-04 1999-08-12 Asf Thomas Industries Gmbh Pompe pour refouler un milieu gazeux/liquide
EP1035071A1 (fr) * 1999-03-05 2000-09-13 Marconi Commerce Systems S.r.L. Distributeur de carburant avec dispositif de coupure lors de la présence de liquide dans la conduite de récupération de vapeurs
GB2348417A (en) * 1999-03-31 2000-10-04 Tokheim Services France Vapour recovery system for hydrocarbon dispensers
FR2791658A1 (fr) * 1999-03-31 2000-10-06 Tokheim Sofitam Sa Installation de distribution d'hydrocarbures liquides equipee d'un moyen de recuperation des vapeurs
NL1014775C2 (nl) * 1999-03-31 2001-01-02 Tokheim Services France Inrichting voor het afleveren van vloeibare koolwaterstoffen, welke inrichting voorzien is van middelen voor het terugwinnen van dampen.
GB2348417B (en) * 1999-03-31 2001-07-18 Tokheim Services France A system for dispensing hydrocarbons from a storage tank
US6302164B1 (en) 1999-03-31 2001-10-16 Tokheim Services France System for dispensing liquid hydrocarbons fitted with a vapor recovery means
BE1013305A5 (fr) * 1999-03-31 2001-11-06 Tokheim Services France Installation de distribution d'hydrocarbures liquides equipee d'un moyen de recuperation des vapeurs.
ES2169991A1 (es) * 1999-03-31 2002-07-16 Tokheim Services France Instalacion de distribucion de hidrocarburos liquidos equipada con un medio de recuperacion de vapores.
WO2003064313A3 (fr) * 2002-01-30 2004-02-19 Cleanair As Procede et appareil

Also Published As

Publication number Publication date
DE4037066C2 (de) 2000-03-23
DE4037066A1 (de) 1992-05-27

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