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EP0155186B1 - Venturisystem zum Absaugen von Flüssigkeit aus und zum Freihalten des Durchgangs in einer Dampfauffangleitung - Google Patents

Venturisystem zum Absaugen von Flüssigkeit aus und zum Freihalten des Durchgangs in einer Dampfauffangleitung Download PDF

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Publication number
EP0155186B1
EP0155186B1 EP19850301779 EP85301779A EP0155186B1 EP 0155186 B1 EP0155186 B1 EP 0155186B1 EP 19850301779 EP19850301779 EP 19850301779 EP 85301779 A EP85301779 A EP 85301779A EP 0155186 B1 EP0155186 B1 EP 0155186B1
Authority
EP
European Patent Office
Prior art keywords
hose
fuel
product
vapor
throat
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
EP19850301779
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English (en)
French (fr)
Other versions
EP0155186A1 (de
Inventor
George Frank Dye
Roger Wayne Furrow
Harold Ray Young
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.)
Gilbarco Inc
Original Assignee
Gilbarco Inc
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 Gilbarco Inc filed Critical Gilbarco Inc
Publication of EP0155186A1 publication Critical patent/EP0155186A1/de
Application granted granted Critical
Publication of EP0155186B1 publication Critical patent/EP0155186B1/de
Expired 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 present invention relates generally to fuel dispensing systems including vapor recovery systems.
  • vapor recovery system In fuel distribution systems such as gasoline pumping systems for delivering gasoline to the fuel tank of a vehicle, environmental protection laws require that vapors emitted during the fuel dispensing process be recovered.
  • One such vapor recovery system includes a vapor recovery hose surrounding a product hose for delivering fuel to a nozzle, typically the nozzle of a gasoline pump. Vapors collected from the vehicle tank at the nozzle end are pushed by positive pressure which develops within the vehicle tank, normally called a balanced system, or sucked by a vacuum from the nozzle back into the gasoline storage tank of the product distribution system via the vapor return path provided by the space between the coaxial product and vapor recovery hoses.
  • the invention disclosed includes a reservoir for collecting condensate from vapors that are flowing through a vapor return line of a fuel delivery system.
  • the reservoir is located within the gasoline dispenser housing of the system, remote from the separate and individual product delivery hose 36, and vapor return line 39.
  • Condensation that forms in a portion of a substantially overhead vapor return line 40 partly returns to the reservoir 20, from which it is returned to the product delivery hose via a product operated pump also located within the dispenser housing adjacent to the reservoir.
  • a venturi pump 3 is used to suck condensate from the reservoir into the product delivery line portion located within the meter housing. No teaching or suggestion of any apparatus or method for maintaining the vapor return line hose 39 free of liquid fuel is made or even alluded to.
  • a venturi is used to power a control circuit which controls operation of a fuel dispensing system having a vapor recovery system.
  • the control circuit responds to a high flow rate of liquid in a vapor recovery path. However, it is not operative to keep the vapor recovery path clear. On the contrary, if the venturi system of GB 2 016 417 A draws up a small amount of liquid, the control circuit then responds to switch the fuel dispensing system off.
  • a fuel dispensing system comprising:
  • said vapor recovery hose is coaxial with and contains said product hose.
  • Said inlet may be coupled via tubing means to an inlet port of said pump means.
  • Said pump means preferably comprises venturi pump means.
  • the fuel dispensing system may further include:
  • venturi pump means may further include spring loaded poppet means within a throat-like constricted area therein, for substantially maximizing the suction force in the low-flow rate range of pumping said fuel.
  • the fuel dispensing system may further include check valve means between said inlet port and said tubing means for preventing fuel flowing from said venturi pump means to said tubing means.
  • the fuel dispensing system may further include filter screen means located between said check valve means and said tubing means, for filtering suctioned fuel from said vapor recovery path prior to its passage through said check valve means.
  • said venturi pump means may include:
  • a venturi liquid removal system 20 is incorporated within hose 7 of two coaxial hoses 5, 7 and nozzle 3 assembly of a fuel distribution system.
  • a flexible tubing 22 is connected to the venturi pump or aspirator assembly 20, with the free end of the tubing 22 being located in an area of the vapor recovery hose 5 where liquid such as gasoline is expected to start to accumulate due to flowback from the nozzle 3 during the dispensing of fuel to a vehicle 1.
  • the venturi pump assembly 20 When fuel flows through the product hose 7, for delivery through the nozzle 3 to a vehicle 1, the venturi pump assembly 20 is operative by the flow of fuel to cause liquid accumulated in the vicinity of the free end of tubing 22 to be sucked back or aspirated through the tubing and into the fuel flowing from the venturi assembly 20 into the nozzle 3. In this way, the vapor path of the vapor hose is maintained substantially clear of blockage by fuel that may overflow or "spitback" from the nozzle 3 into the vapor path, thereby permitting the free flow of vapors from the nozzle 3 back through the vapor path of vapor hose 5 to.a collection point.
  • FIG. 3 One embodiment of the invention is shown in Figure 3, and includes a venturi assembly 20 mounted between the inlet end 24 of a nozzle 3 and the product delivery end 26 of a coaxial hose system, including an inner product delivery hose 7 surrounded by an outer vapor hose 5.
  • the venturi assembly 20 includes an outer tubular member 21 fabricated from a rigid material, such as appropriate metals, having threaded end portions 28 for connection to mating members of the nozzle 3 and vapor hose connection 6 as shown.
  • the venturi pump or aspirator 31 includes a rigid tubular housing 32 shaped as shown for enclosing a spring loaded poppet valve 34.
  • the poppet valve 34 has a centrally located rod-like member 36 ideally mounted within a tubular sleeve member 38, and a spring 40 for providing appropriate spring biasing of the poppet valve 34.
  • a rigid inlet tube 42 is provided for connecting the inlet hole 44 to the flexible hose or tubing 22, the latter which can be fabricated from polyethylene or butyl rubber, for example.
  • a flapper valve 46 serving as a check valve is preferably installed within the inlet tubing 42, for preventing gasoline or other liquid fuel product flowing through the product hose 7 from being forced into the vapor path of the vapor hose 5. In other words, the flapper valve 46 serves to insure that fluid can only flow in one direction, namely from the vapor path of vapor hose 5 to the venturi pump 31.
  • a suitable check valve 46 is believed to be a duck bill check valve manufactured by Vernay Laboratories, Inc., Yellow Springs, Ohio, 45387, under Vernay Part No. VA3426.
  • a filter screen 48 serving to filter out any contamination contained within the fuel sucked back to the venturi pump 31 via the tubing 22.
  • the filter substantially ensures reliable long-term operation of check valve 46.
  • Ring-like bushing members or spacers 50 are provided for maintaining the venturi housing 31 centered within the venturi assembly 20, as shown.
  • the rings or bushings 50 include a plurality of holes or openings 52 for permitting the free flow of vapors from a nozzle 3 to the vapor hose 5 as shown.
  • the flexible tubing 22 is passed through one of the holes in the ring or bushing member 50 associated therewith.
  • the product hose 7 for carrying fuel to nozzle 3 is connected to the inlet 54 of venturi 31 via O-ring seals 56, whereby the inlet 54 receives rigid hose connector 8.
  • the product outlet portion 58 of venturi housing 31 is coupled to the product inlet 60 of nozzle 3 via 0-ring seals 62.
  • the venturi pump or aspirator 31 is operative to draw fluid from areas within the vapor hose 5 where the fluid may accumulate (see Figure 2), through the inlet tube 42 and hole 44 for return to the product stream flowing through the product hose 7, as shown.
  • the spring loaded poppet valve 34 permits the venturi pump to draw fluid even at relatively low flow rates of product. As will be shown, unless it is necessary to produce adequate suction via the venturi pump 31 throughout a very wide range of product flow rate, including very low flow rates of product, the spring loaded poppet valve 34 may not be required.
  • the poppet 34 When the spring loaded poppet 34 is implemented, the poppet 34 is always located as shown for opposing the direction of product flow through the product hose 7 of the coaxial hose system 5, 7. Controlled loading by the spring 40 produces a small cross sectional flow area and consequent high velocity of product past the inlet hole 44. The high velocity product flow produces a low static pressure on the inlet tube 42, thereby providing the suction for aspirating accumulated product out of the vapor hose 5.
  • the one way check valve 46 prevents product from being pumped into the vapor path portion of the vapor hose 5 when the fuel is not flowing or the flow rate is low.
  • the venturi pump 31 can be located within the nozzle assembly 3, in certain applications.
  • FIG. 4A A second and preferred embodiment of the invention is shown in Figures 4A through Figure 7.
  • Figure 4A a top view of the housing of the venturi pump 64 ultimately developed for use in product by the inventors is shown.
  • FIG 4B a sectional view taken along AA of Figure 4A is shown.
  • the venturi pump 64 is of a fixed throat design, in contrast to the variable throat design of Figure 3 provided by the poppet valve 34.
  • the dimensioning of the venturi chamber of the venturi pump 64 is considered critical to obtaining a low static pressure at the orifice 66 sufficient for continuously aspirating or sucking fluid out of the vapor hose 5 (for example) over a given range of flow rate of product.
  • venturi pump 64 designed the venturi pump 64 to provide low enough static pressure for adequate aspiration away from the vapor path of the vapor hose 5 over a product flow rate range of 6.5 to above 10.0 gallons per minute of gasoline, in this example. Certain critical dimensions (0 1 , D 2 , D 3 , L 1 , L 2 , L 3 , a, and 9) for the venturi pump 64 to provide such operation are discussed in the following paragraph.
  • the venturi pump 64 includes as shown in Figure 4B, an inwardly tapering conical inlet throat 68 relative to the direction of fuel flow having an entry diameter 0 1 of 0.53 inch, an exit diameter O2 of 0.213 inch, an angle a of 12 degrees 15 minutes with its longitudinal axis 70 measured from its exit end, and a length L 1 with respect to its longitudinal axis 70 of 0.720 inch, a central cylindrical portion 72 having a length of 0.10 inch, and a diameter equivalent to the exit diameter D 2 of the inlet throat 68.
  • the inlet port 66 for the venturi pump 64 includes a hole through the wall of the cylindrical portion 72, having a 0.062 inch diameter.
  • the venturi pump 64 further includes an outwardly tapering conical outlet throat 74 having an entry diameter equivalent to the diameter of cylindrical portion 72 or the exit diameter D 2 of the inlet throat 68, an exit diameter D 3 of 0.50 inch, a length L 3 with respect to its longitudinal axis 70 of 2.07 inches, and an angle f3 of 4 degrees with its longitudinal axis 70 measured from its entry end adjacent cylindrical portion 72.
  • the reduced portions of the body of the venturi pump 64 associated with the outlet throat 74 includes sections 76 and 78 having diameters of D 4 , and D 5 , respectively, which are dimensioned for connection or coupling to a particular nozzle or hose assembly.
  • the overall outer configuration and dimensioning of the venturi pump 64 may be tailored to or adapted for the particular mounting configuration and application.
  • a coupling section 80 configured for coupling to a coaxial hose assembly 82 as shown in Figure 7, in this example.
  • the coupling section 80 includes two raceways 84 and 86 for receiving "0" rings 88 as shown in Figure 6A.
  • a chamfer 91 is included at the entry of the coupling chamber 80 portion of venturi pump 64.
  • a stud like projecting portion 90 is included in the venturi pump 64 housing, and has a hole 92 for receiving a groove pin 94, as shown in Figure 6A, wherein the groove pin 94 is pressed into the hole 92.
  • FIG. 4C An end view of the venturi pump 64 taken from the inlet throat 68 is shown.
  • a check valve and filter assembly 102 is provided as shown in Figure 5A.
  • the check valve 104 is identical to the check or flapper valve 46 of Figure 3, in this example, and as previously mentioned is manufactured by Vernay Laboratories, Inc., Yellow Springs, Ohio, USA under Vernay Part No. VA3426.
  • a cap like filter screen 106 is also included for serving the same function as filter 48 of Figure 3.
  • the outlet end 108 is coupled to the inlet hole or port 98 of venturi pump 64.
  • the other end 110 is configured for coupling to a flexible tube 112, as shown in Figure 7.
  • An end view of the filter assembly 102 taken from the end 110 is shown in Figure 5B.
  • venturi pump 64 is shown in its assembled configuration with check valve and filter assembly 102, and including "O"-rings 88, and groove pin 94.
  • An end view of the assembly taken from the inlet 68 end is shown in Figure 6B.
  • FIG 7 a partially exploded, partially cutaway assembly view is shown of one application of the subject invention.
  • the flexible product return tubing 112 is clamped to the check valve and filter assembly 102 via a tubing clamp 114.
  • the other end of the product return tubing 112 is clamped via another tubing clamp 114 to a suction head 116 as shown.
  • Clamps 118 are used for securing the product return tubing 112 and suction head 116 to the product hose 120, for example.
  • Outer vapor hose 122 surrounds the product hose 120, to form a coaxial hose assembly 82.
  • This coaxial hose assembly 82 is rigidly connected to a coupling connector 124 for connection to the product feed and vapor return lines of a fuel dispensing system (not shown), for example.
  • the other end of the coaxial hose assembly 82 is coupled to another coupling connector 126 for coupling to the venturi pump 64, and nozzle 128.
  • the coupler 126 includes an "0"-ring seal 130, as shown.
  • the tube like projection 132 of coupler 126 is dimensioned for plugging into the coupling chamber 80 of venturi pump housing 64, whereby groove pin 94 of venturi pump 64 is insertable into a guide pin hole of the spacer 133 (this hole is not shown).
  • Spacer 133 is fixed to product hose 120 with set screws (not shown).
  • venturi pump 64 With respect to product hose 120 is prevented by the coupling between groove pin 94 and the hole in spacer 133.
  • a similar antirotation device is provided in coupling 124 to prevent rotation of product hose 120 with respect to coupling 124 which is rigidly fixed to dispenser 136.
  • the vapor recovery path 134 is provided by the area between the inner product hose 120, and the outer vapor hose 122.
  • the suction head 116 is located and maintained in an area of vapor hose 122 (via the previously described antirotation mechanisms) where liquid fuel is expected to start to accumulate from "spit back" or "over flow” from the nozzle 128, as previously explained.
  • FIG 8 a typical multi-product dispenser system for liquid fuel is shown. Assuming that the hoses shown are outer vapor hoses 122, as shown in Figure 7, connected to nozzles 128, venturi pumps 64 are located as shown in Figure 7 near the base of the nozzles 128. The positioning for the suction head 116 in the coaxial hose assembly 82 is determined in consideration of the usual low point of the coaxial hose assembly 82 during the refuelling of a vehicle.
  • the gasoline pump housing 136 includes the usual meters 138, and so forth.
  • an alternative embodiment of the invention may include a pump means for non-coaxial product and vapor hoses, whereby a rigid housing 140 installed between the nozzle 141, product hose 142 and vapor hose 143 includes a venturi pump 144, similar to venturi pump 64, located in the fuel flow and a vapor flow path 145 for passing vapor from the nozzle 141 to the vapor hose 143.
  • a rigid tube 147 located in the vapor flow path 145 connects the venturi pump throat opening 146 with a flexible tube 148 which terminates at an area of the vapor hose 143 where fuel is expected to accumulate.
  • a check valve and filter assembly (not shown) similar to the check valve and filter assembly 102 used with venturi pump 64 is installed in a suitable location between the venturi pump throat opening 146 and the flexible tube 148.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Jet Pumps And Other Pumps (AREA)

Claims (9)

1. Brennstoffzapfsystem mit
einem Mundstück (3: 128) für die Abgabe von Brennstoff,
einem Produktförderweg für die Förderung des Brennstoffs von einem Vorratsbehälter zu dem Mundstück (3: 128) über eine Pumpe, wobei der Produktförderweg einen Produktschlauch (7:120) aufweist,
einem Dampfrückführweg für die Rückführung von bei der Betankung eines Fahrzeugs (1) am Mundstück (3: 128) entwickelten Dämpfen, wobei der Dampfrückführweg einen Dampfrückführschlauch (5: 122) aufweist, und
einer im Produktförderweg angeordneten Pumpeinrichtung (21: 64), welche über einen Bereich von Produkt-Fließgeschwindigkeiten von der Strömung des produkts entlang dem Förderweg zum Absaugen von Flüssigkeit aus dem Dampfrückführweg betätigbar ist,
dadurch gekennzeichnet, daß die Pumpeinrichtung (21: 64) einen Einlaß aufweist, welcher in einem Bereich des Dampfrückführschlauchs (5: 122) derart angeordnet ist, daß sich beim Betanken eines Fahrzeugs (1) aufgrund des Rückflusses von dem Mundstück (3: 128) in dem genannten Bereich des Dampfrückführschlauchs ansammelnde Flüssigkeit von der Pumpeinrichtung (21: 64) aus dem genannten Bereich angesaugt und in den Produktförderweg eingetragen wird.
2. Brennstoffzapfsystem nach Anspruch 1, bei welchem der Dampfrückführschlauch (5: 122) koaxial mit dem Produktschlauch (7: 120) angeordnet ist und diesen enthält.
3. Brennstoffzapfsystem nach Anspruch 1 oder 2, bei welchem der Einlaß über eine Leitungsanordnung (22: 112) mit einer Einlaßöffnung (44: 66) der Pumpeinrichtung (21: 64) verbunden ist.
4. Brennstoffzapfsystem nach Anspruch 1, 2 oder 3, bei welchem die Pumpeinrichtung (21: 64) ein Venturipumpsystem aufweist.
5. Brennstoffzapfsystem nach einem dervorstehenden Ansprüche, ferner umfassend:
eine nicht verdrehbare Kupplungseinrichtung (92, 94) zum Sichern der Pumpeinrichtung (64) im Produktschlauch (120) in einer eine Verdrehung der Pumpeinrichtung relativ zum Produktschlauch verhindernden Weise und zum Festlegen der Ausrichtung des Einlasses im wesentlichen in dem genannten Bereich des Dampfrückführschlauchs (122).
6. Brennstoffzapfsystem nach Anspruch 4 oder den Ansprüchen 4 und 5, bei welchem das Venturipumpsystem (21) ferner ein federbelastetes Teller- oder Klappenventil (34) in einem halsförmig eingeschnürten Abschnitt darin aufweist, um die Saugkraft im Bereich der niedrigen Fließgeschwindigkeiten bei der Förderung des Brennstoffs im wesentlichen zu maximieren.
7. Brennstoffzapfsystem nach Anspruch 3 oder einem der Ansprüche 4 bis 6, soweit darauf bezogen, ferner umfassend eine Rückschlagventilanordnung (46: 102) zwischen der Einlaßöffnung (44: 66) und der Leitungsanordnung (22: 122) zum Verhindern einer Strömung des Brennstoffs von dem Venturipumpsystem (21: 64) zu der Leitungsanordnung.
8. Brennstoffzapfsystem nach Anspruch 7, ferner umfassend eine Filtersiebanordnung (48: 106) zwischen der Rückschlagventilanordnung (46: 102) und der Leitungsanordnung (22: 122) zum Filtern von aus dem Dampfrückführweg abgesaugtem Brennstoff vor dessen Durchfluß durch die Rückschlagventilanordnung.
9. Brennstoffzapfsystem nach Anspruch 4 oder einem der Ansprüche 5 bis 8, soweit auf Anspruch 4 bezogen (jedoch ausschließlich Anspruch 6), bei welchem das Venturipumpsystem
einen relativ zur Richtung des Brennstoffstroms sich einwärts verjüngenden Einlaßabschnitt (68) mit einem Eintrittsdurchmesser von 0,53 Zoll (13,46 mm), einem verengten Durchmesser von 0,213 Zoll (5,410 mm) einen Winkel von 12° 15' mit seiner Längsachse, gemessen von seinem verengten Ende und einer Länge, bezogen auf seine Längsachse, von 0,720 Zoll (18,288 mm), einen mittleren zylindrischen Abschnitt (72) mit einer Länge von 0,10 Zoll (2,54 mm) und einem dem Ausgangsdurchmesser des Einlaßabschnitts (68) entsprechenden Durchmesser, wobei die Einlaßöffnung (66) des Venturipumpsystems (64) eine eine Wandung des zylindrischen Abschnitts durchsetzende Bohrung mit einem Durchmesser von 0,062 Zoll (1,575 mm) aufweist, und
einen sich auswärts erweiternden, konischen Auslaßabschnitt (74) aufweist, welcher einen dem Durchmesser des zylindrischen Abschnitts entsprechenden Eintrittsdurchmesser, einen Austrittsdurchmesser von 0,50 Zoll (12,70 mm), eine auf seine Längsachse bezogene Länge von 2,070 Zoll (52,578 mm) und einen von seinem Eintrittsende gemessenen Winkel von 4° mit seiner Längsachse aufweist,
wobei der mittlere zylindrische Abschnitt (72) das Austrittsende des Einlaßabschnitts (68) derart mit dem Eintrittsende des Auslaßabschnitts (74) verbindet, daß er eine gemeinsame Längsachse dazwischen definiert.
EP19850301779 1984-03-15 1985-03-14 Venturisystem zum Absaugen von Flüssigkeit aus und zum Freihalten des Durchgangs in einer Dampfauffangleitung Expired EP0155186B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59006384A 1984-03-15 1984-03-15
US590063 1984-03-15

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP89100659.5 Division-Into 1985-03-14

Publications (2)

Publication Number Publication Date
EP0155186A1 EP0155186A1 (de) 1985-09-18
EP0155186B1 true EP0155186B1 (de) 1989-09-20

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ID=24360735

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19890100659 Expired EP0326842B1 (de) 1984-03-15 1985-03-14 Kraftstoff-Abgabevorrichtung
EP19850301779 Expired EP0155186B1 (de) 1984-03-15 1985-03-14 Venturisystem zum Absaugen von Flüssigkeit aus und zum Freihalten des Durchgangs in einer Dampfauffangleitung

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19890100659 Expired EP0326842B1 (de) 1984-03-15 1985-03-14 Kraftstoff-Abgabevorrichtung

Country Status (5)

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EP (2) EP0326842B1 (de)
AU (1) AU568195B2 (de)
CA (1) CA1276917C (de)
DE (2) DE3584838D1 (de)
DK (1) DK162712C (de)

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US5129433A (en) * 1985-12-02 1992-07-14 Tokheim Corporation Vapor passage fuel blockage removal
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Also Published As

Publication number Publication date
DK162712B (da) 1991-12-02
DE3584838D1 (de) 1992-01-16
DK117685D0 (da) 1985-03-14
DE3573104D1 (en) 1989-10-26
AU568195B2 (en) 1987-12-17
AU4009785A (en) 1985-09-19
CA1276917C (en) 1990-11-27
DK117685A (da) 1985-09-16
EP0326842A1 (de) 1989-08-09
EP0155186A1 (de) 1985-09-18
DK162712C (da) 1992-04-27
EP0326842B1 (de) 1991-12-04

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