US1707229A

US1707229A - Carburetor

Info

Publication number: US1707229A
Application number: US127740A
Authority: US
Inventors: Myron B Lloyd
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-08-07
Filing date: 1926-08-07
Publication date: 1929-04-02
Anticipated expiration: 1946-04-02

Description

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CARBURETUE.

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buretor and the mixture is thinned by further addition of air before passing into the engine.

Une ofwthe principal objects of the invention is to provide a means for adding addim tional air to the charge in a manner to greatly increase the turbulence and to produce a finely atomized charge which will not readily condense. This is accomplished by providing a flow of air opposed to the flow of the charge through the venturi from which the charge leaves the carburetor.

Another object of the invention is to provide a double venturi at the liquid fuel inlet of the carburetor by which air is added to the over-rich mixture before passing through the final venturi which produces the turbulence.

These object-s and the several novel features of the invention are hereinafter more fully described and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawings in. which- Fig. 1 is a longitudinal section through a carburetor embodying my invention.

Fig. 2 is a section taken on line 2-2 of Fig. 1.

Fig. 3 is an end view of the venturi con taining the liquid fuel nozzle.

The carburetor comprises a float chamber 1 containing the usual float for controlling the liquid fuel supplyand having. a liquid fuel inlet 2. The outlet 3 for the liquid fuel opens beneath the venturi l as shown in Figs. 1 and 2. This venturi 4: is provided with a nozzle 5 which is controlled by the needle valve 6. The venturi 4; is a double venturi having an enlarged chamber 7 in the center and is provided with a series of longitudinal air passages 8 thereabout. The discharge end of the venturi 4 is in the shape of a truncated cone and a member 9 is positioned in the conduit 10 in spaced relation with the venturi 4t. This arrangement provides a space 11 into which the apertures 8 discharge. The carburetor is provided with an air inlet 12 controlled by the choke valve13 and this air inlet opens into the conduit 14: which is pro.-

. vided with two venturis 15 'in the opposite ends which divide the air flow in two difventuris be the same size for this purpose. A valve stem 16 is provided in the carburetor carrying two butterfly valves 17 and 18 for controlling the conduits lt and 10. The conduit 14 opens into a chamber 19 which extends completely about the venturi 20 formed integrally with the carburetor. A series of openings 21 are provided which lead from the chamber 19 into the interior of the venturi 20 against the flow through the venturi as shown in Fig. 1. A bypass 22 is also provided leading from the chamber 7 in the venturi a into the point of greatest restriction of the venturi 20. This provides a bypass about the butterfly valve 18 for idling speeds of the engine. When the throttle valves 17 and 18 are closed as shown in Fig. 1 a liquid fuel and air mixture is drawn into the chamber 7 from the opposite end of the venturi from the several apertures 8. In this manner a rich mixture is drawn into the bypass 22 and passes therethrough and is discharged into the venturi 20providing a supply of liquid fuel for idling speeds of the engine, when the throttle valves are closed.

Tn operation the air flowing into-the intake 12 is divided into two streams,.one of which passes through the venturi l5 and conduit 9.3 and through the double venturi 4. The flow of air picks up liquid fuel from the nozzle 5 and in passing through the chamber 7 the charge 18. agitated before being discharged from the venturi. Part of the air flow passes through the apertures 8 in the venturi 4 and is discharged into the space 11 between the venturi and the member 9. 0 11 account of the angle of this space this air is thrown forcibly inwardly and further mixes the charge as it passes into the conduit 10. its the charge passes the greatest restriction of the venturi 20 air is drawn inwardly through the apertures 21 against the flow througlithe venturi 20' and thus producing a turbulence which very thoroughly mixes the gas and air before being discharged from the carburetor through the opening 24:. ft is to be noted that the action in this carburetor is the same whether the flow through the carburetor is produced by a vacuum or by pressure through means of a supercharger. in either case the final addition of air is against the flow through the venturi 20 which produces a mixing action ordinarily impossible to attain. In order to produce the desired action in the carburetor it is necessary that the two venferent directions it being important that the turis 15 have the same sized opening theretill ldl)

through and that the combined area of the openings through the venturi 4 be equal to the area of the opening through the venturi 15 at the left of Fig. 1. It is also necessary that the area of the opening through the.

point of greatest restriction of the venturi 20 be equalto the areas of the combined openings through the venturi 4 and that the area of the openings 21 in the venturi 20 be equal to the area of the opening through the venturi 15 at the right of Fig. 1. With the several openings arranged in this manner fresh air will flow inwardly through the several openings 21 against the directionof flow of the charge through the venturi 20 and these several streams flowing in this manner produce a turbulence and mixing action which thoroughly vaporizes the liquid fuel. The speed of the engine is controlled by turning the double valve 17 and 18 by means of a stem 16 while the choke valve 13 may be utilized for starting.

From the foregoing description it becomes evident that the device is very simple and etficient in operation, produces a very complete mixing action between the air and liquid fuel and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is 1. In a carburetor, a U shaped main conduit, an air inlet openlng into the U shaped main conduit, a chamber into which one end of the main conduit discharges, a venturi through which the opposite end of the main conduit discharges, the chamber surrounding the venturi and the ventrui being provided with a series of angular apertures adapted to direct air inwardly from the chamber against the flow through the venturi, a venturi in the main conduit intermediate its ends having two points of restriction forming a chamber therebetween, a valve controlled liquid fuel nozzle opening into the said venturi having two restrictions at the first point of restriction, the said venturi having two restrictions being provided with a series of longitudinal apertures about the main opening therethrough, the end of the venturi through which the apertures open being in the shape of a truncated cone, an annular deflector positioned in spaced relation with the end of the venturi and adapted to deflect the air from the said apertures inwardly and a bypass leading from the said chamber of the venturi having the two restrictions and discharging into the first named venturi. i

2. In a carburetor, a main air conduit through which air is adapted to flow in two directions, a venturi in the main conduit having two points of restriction forming a chamber therebetween, a valve controlled jet opening through the first point of restriction,

the venturi being provided with a series of longitudinal apertures therethrough about the main opening therethrough and being in the form of a truncated cone at the end, an annular deflector positioned in the main conduit in spaced relation with the end of the venturi, a venturi in the end of the main conduit about which air from the opposite end of the main conduit is adapted to flow, the said venturi being provided with a series of apertures opening therethrough and adapted to direct the air inwardly against the flow through the venturi, and a bypass for fuel and air leading from the said chamber ofthe venturi having'the two points of restriction and discharging the last named venturi at the point of greatest restriction.

3. In a carburetor, a U shaped main conduit, an air inlet opening into the U shaped main conduit, a chamber into which one end of the main conduit discharges, a venturi through which the opposite end of the main conduit discharges, the chamber surrounding the venturi and the venturi being provided with a series of angular apertures adapted to direct air inwardly from the chamber against the flow through the venturi, a venturi in the main conduit intermediate its ends having two points of restriction forming a chamber therebetween, a valve controlled liquid fuel nozzle opening into the said venturi at the first point of restriction, the said venturi being provided with a series of longitudinal apertures about the main opening therethrough, and a bypass for fuel and air extending from the chamber of the venturi having the two points of restrictionand discharging to the venturi at the dis charge end of the main conduit.

4. In a carburetor, a main air conduit, means for admitting air into the main air conduit. intermediate its ends, the air' being adapted to flow in opposite directions through the main conduit, a venturi in one end of the main conduit, a chamber into which the opposite end of the main conduit discharges, the said chamber surrounding the venturi and the venturi being provided with a series of angularly positioned apertures adapted to direct air inwardly from the chamber against the flow through the venturi.

5. In a carburetor, a U shaped main conduit. a chamber into which one end of the conduit discharges, a venturi through which the opposite end of the main conduit discharges, the chamber surrounding the venturi, and the venturi being provided with a series of angular apertures adapted to direct air inwardly from the chamber against the flow through the venturi.

In testimony whereof I sign this specification.

MYRON B. LLOYD.