US3758084A - Nozzle check valve system - Google Patents

Nozzle check valve system Download PDF

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Publication number
US3758084A
US3758084A US00206324A US3758084DA US3758084A US 3758084 A US3758084 A US 3758084A US 00206324 A US00206324 A US 00206324A US 3758084D A US3758084D A US 3758084DA US 3758084 A US3758084 A US 3758084A
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US
United States
Prior art keywords
opening
valve
chamber
passage
fuel
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 - Lifetime
Application number
US00206324A
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English (en)
Inventor
Ch Tuckey
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.)
Wallro Corp
Original Assignee
Wallro Corp
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Publication date
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Publication of US3758084A publication Critical patent/US3758084A/en
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Assigned to HARRIS TRUST AND SAVINGS BANK, A IL BANKING CORPORATION reassignment HARRIS TRUST AND SAVINGS BANK, A IL BANKING CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WALBRO CORPORATION A CORP. OF DE
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/02—Floatless carburettors
    • F02M17/04—Floatless carburettors having fuel inlet valve controlled by diaphragm
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/68—Diaphragm-controlled inlet valve

Definitions

  • F02ni 17/04 is provided to close, in one position, the fuel duct from [58] Field of Search 261/35, 69 A, DIG. 68 the mixing passage, and, in a second position to block the first branch of the fuel duct, leaving the second [56] References Cited branch as the fuel supply duct.
  • fuel can flow through both branch passages to provide an acceleration fuel flow during a change-over condition from idle to full throt- 7/1971 Nutten 26l/DIG.
  • This invention relates to a Nozzle Check Valve System and more particularly to a check valve control system for the main jet of a carburetor which provides flow from a diaphragm chamber to the venturi area of the carburetor, the construction being such that upon opening of the throttle of the carburetor, an acceleration charge is made available to insure rapid acceleration.
  • the dimensions of these carburetors are in the nature of a cube which is approximately 1% inches on a side as distinguished from previous carburetors which were 1% inches to 2 inches in cubic dimension.
  • FIG. 1 a secti2nal view of a carburetor construction showing the general relationship of the diaphragm chamber to the mixing passage.
  • FIGS. 2, 3 and 4 diagrammaticpresentationsof the fuel supply system of the present invention showing the checkvalve in various positions.
  • FIG. 5 a bottom view of the carburetor shown'in FIG. 1 taken on line 5-5 of FIG. 1.
  • FIG. 6 a view of a gasket sheet used in the valve construction.
  • FIG. 7 a view of a valve sheet.
  • FIG. 8 a view of a cover plate.
  • FIG. 1 a careburetor is shown having a bodyl provided with a mixing passage 12 which includes a venturi section 14 shown diagrammatically in FIG. 2
  • a pump chamber 18 of standard construction having a pump diaphragm 20
  • the position of this valve 30 is controlled by a piv-' oted lever 32 pivoted at 34 and biased by a spring 36.
  • the lever is controlled by a projection 38 on a diaphragm 40 acting in a diaphragm chamber 42 formed by one wall of the carburetor body and a closure and retaining cap 44..
  • FIG. 5 the bottom of the carburetor body 10 is shown as viewed on line 5-5 of FIG. 1. It will be seen that the lever 32 is pivoted on the pin 34 held in place by a screw 46. Screw holes 48 are provided for holding the plate 44 on the body and locator lugs 50 provide proper registry for the diaphragm 40 and the gasket that surrounds it.
  • the wall of the body 10 illustrated in FIG. 5 within the diaphragm chamber 42 is recessed at 52 to provide for a check valve assembly. On the face of the recess 52 is a further recessed passage 54 which contains three openings extending into the mixing passage 12. These openings, designated at 56, 58 and 60, are shown diagrammatically in FIGS. 2 to 4 and form the idle passages for the carburetor.
  • Fuel from the diaphragm chamber passes from the valve 30 through a channel 62 and around a screw opening 64 to a passage 66 (dotted lines) leading to the sinuous passage 54.
  • the idle control valve needle 68 controls fuel flowing through the passage 66to the idle system.
  • a sheet 80 is illustrated of material having a thickness in the neighborhood of one sixtyfourth inch provided with a recess opening 82 which will overlie the area 70 in the chamber 52. The peripheraledges of the opening 82 will seal against the outlining ridge of the area 70.
  • a screw hole 84 is provided for a retaining screw 86 (FIG. 1).
  • FIG. 7 a sheet of very thin, resilient material is shown at 90 again having a screw hole 92 and a flap valve 94 formed therein which will overlie the opening 72 within the area 70 of FIG. 5.
  • a retaining plate l00 is illustrated formed of metal having a screw hole 102 which will register with the holes 92 and 84 of the elements 80 and 90. It will be noted that the general profile of the elements 80, 90 and is substantially identical and will fit the recess 52 formed in the wall of the diaphragm chamber.
  • the valve 94 is positioned to overlie the main jet opening 72 leading to the mixing passage and it is also positioned to underlie an opening 104 leading through the plate to the diaphragm chamber.
  • the valve 94 will be movable in the recess created by the opening 82 and movable as shown in the diagrammatic views (FIGS. 2 to 4) to close the opening 104 in one position and to close the opening '72 in another position.
  • the passage then from the diaphragm chamber 42 to the mixing passage is composed of the root portion 104 in the plate 100 which opens into-the recess 82, the passage then branching into the first section leading to the jet opening 16 and a second section through the opening 74 and past the main jet :valve 78 to the opening 76.
  • the valve 94 will be in the down position closing the root opening 104 to prevent blowback from the mixing 7 pasage through the idle chambers.
  • the fuel may pass from the diaphragm chamber throughthe idle passages to the opening56.
  • Passages 58 and 60 in this closed position may serve as air inlets for the idle mixture.
  • these passages 58 and 60 excellent, producing a suitable change-over from idle to full throttle with a very simple construction, this being highly important because of the small size of the carburetor which prevents the addition of more complicated acceleration systems.
  • valve flap 94 will have an intermediate position as shown in FIG. 2 wherein fuel from the diaphragm chamber 42 can pass to the mixing chamber port 16 through both branches of the fuel duct, i.e.,
  • the acceleration charge is made available without the need of pulse chambers'or additional pumps and so on.
  • the reason for the unexpected effect in this case is not completely understood. It may be partially due to the fact that the fuel in chamber 82 is pushed upwardly by the flap valve so that it surges into the fuel duct and also that fuel can pass around the sides and the ends of the valve through the chamber 82 to reach the main fuel duct 16 in addition to passing through the ducts controlled by the needle valve.
  • the effect, however, of the construction is which comprises a main fuel duct with a double branch portion at one portion thereof between a root opening into the chamber and a main fuel nozzle leading to the mixing passage, a fuel metering valve controlling the effective size of one of said branches, and a check valve at said root opening movable to a first position to block reverse flow from said mixing passage to said chamber and. to a second position to block flow through the other of said branches, said valve in an intermediate position allowing flow through both said branches.
  • a device as defined in claim 1 in which a plate is mounted on one wall of said chamber having a hole to form the root opening of the main fuel duct and located to provide a flat recess surrounding the diaphragm end of said branch passage, and said check valve comprises a flat valve member in said recess overlying said plate movable to said first position to close said hole and to said second position to close said other branch passage.
  • a device as defined'in claim 1 in which a carburetor body has a wall forming one wall of a diaphragm chamber, a plate positioned against said wall having a portion spaced from said wall adjacent said branch passages to provide a thin cavity, said plate having a hole to provide said root passage at said spaced portion, and said check valve comprises a flexiblevalve member positioned in said cavity to overlie said hole in said first position and movable in said cavity to said second position to close said other branch passage.
  • a carburetor body having a wall forming one wall of a diaphragm chamber, said wall having two branch passages originating at said wall and leading to a common fuel nozzle opening intoa mixing passage, a manual control valve positioned to regulate one of said branch passages, a sheet of material on said one wall provided with an opening forming a shallow recess overlying openings to said branch passages, a sheet of flexible material having a flap valve formed therein positioned to overlie said recess, said valve overlying the opening into the other of said branch passages, and plate means overlying said sheets 1 having an opening underlying said flap valve and connecting said chamber to said recess wherein said valve branch passages.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US00206324A 1971-12-09 1971-12-09 Nozzle check valve system Expired - Lifetime US3758084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20632471A 1971-12-09 1971-12-09

Publications (1)

Publication Number Publication Date
US3758084A true US3758084A (en) 1973-09-11

Family

ID=22765869

Family Applications (1)

Application Number Title Priority Date Filing Date
US00206324A Expired - Lifetime US3758084A (en) 1971-12-09 1971-12-09 Nozzle check valve system

Country Status (9)

Country Link
US (1) US3758084A (de)
JP (1) JPS5012537B2 (de)
CA (1) CA966377A (de)
DE (1) DE2257470C3 (de)
FI (1) FI54834C (de)
FR (1) FR2164404A5 (de)
GB (1) GB1362129A (de)
IT (1) IT966792B (de)
SE (1) SE377486B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001354A (en) * 1975-11-17 1977-01-04 Walbro Corporation Cover plate for a carburetor body
US4084562A (en) * 1972-08-08 1978-04-18 Robert Bosch Gmbh Fuel metering device
US4759883A (en) * 1987-03-12 1988-07-26 Walbro Corporation Temperature compensated fluid flow metering system
FR2694048A1 (fr) * 1992-07-21 1994-01-28 Walbro Corp Carburateur pour carburant gazeux.
US5441673A (en) * 1992-01-30 1995-08-15 Andreas Stihl Carburetor for an internal combustion engine
US5688443A (en) * 1995-04-10 1997-11-18 Walbro Corporation Temperature compensated fluid flow metering carburetor and method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5259415U (de) * 1975-10-28 1977-04-30
JPH0196985U (de) * 1987-12-18 1989-06-28
JPH01178692A (ja) * 1988-01-08 1989-07-14 Yoshimori Katou 透過照明板となった引き戸又はドア

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253822A (en) * 1964-03-09 1966-05-31 Walbro Corp Self-lift carburetor
US3330545A (en) * 1965-10-13 1967-07-11 Tillotson Mfg Co Carburetor with fuel enrichment means
US3593967A (en) * 1969-11-28 1971-07-20 Borg Warner Diaphragm carburetor having fuel channel system for engine idling and acceleration

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253822A (en) * 1964-03-09 1966-05-31 Walbro Corp Self-lift carburetor
US3330545A (en) * 1965-10-13 1967-07-11 Tillotson Mfg Co Carburetor with fuel enrichment means
US3593967A (en) * 1969-11-28 1971-07-20 Borg Warner Diaphragm carburetor having fuel channel system for engine idling and acceleration

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084562A (en) * 1972-08-08 1978-04-18 Robert Bosch Gmbh Fuel metering device
US4001354A (en) * 1975-11-17 1977-01-04 Walbro Corporation Cover plate for a carburetor body
DE2649811A1 (de) * 1975-11-17 1977-05-18 Walbro Corp Deckplatte fuer ein vergasergehaeuse
US4759883A (en) * 1987-03-12 1988-07-26 Walbro Corporation Temperature compensated fluid flow metering system
EP0281771A2 (de) * 1987-03-12 1988-09-14 WALBRO CORPORATION (Corporation of Delaware) Temperaturkompensiertes Fluidzumesssystem
EP0281771A3 (en) * 1987-03-12 1989-04-19 Walbro Corporation (Corporation Of Delaware) Temperature compensated fluid flow metering system
US5441673A (en) * 1992-01-30 1995-08-15 Andreas Stihl Carburetor for an internal combustion engine
FR2694048A1 (fr) * 1992-07-21 1994-01-28 Walbro Corp Carburateur pour carburant gazeux.
US5688443A (en) * 1995-04-10 1997-11-18 Walbro Corporation Temperature compensated fluid flow metering carburetor and method

Also Published As

Publication number Publication date
DE2257470B2 (de) 1978-03-02
JPS5012537B2 (de) 1975-05-13
IT966792B (it) 1974-02-20
DE2257470A1 (de) 1973-06-14
FI54834B (fi) 1978-11-30
GB1362129A (en) 1974-07-30
DE2257470C3 (de) 1978-11-09
SE377486B (de) 1975-07-07
FI54834C (fi) 1979-03-12
CA966377A (en) 1975-04-22
FR2164404A5 (de) 1973-07-27
JPS4864333A (de) 1973-09-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HARRIS TRUST AND SAVINGS BANK, 111 WEST MONROE ST.

Free format text: SECURITY INTEREST;ASSIGNOR:WALBRO CORPORATION A CORP. OF DE;REEL/FRAME:005660/0559

Effective date: 19910325