US1718652A - Carburetor - Google Patents

Description

7 June 25, 1929. J L-ANGDQN 1,718,652

CARBURETOR Filed April 27, 1927 INVENTOR" Jo'finJlan'qdanq ATTORNEY ii U Patented June 25, 1929.

PATENT OFFICE.

JOHN J. LANGDON, OF HARTFORD, CONNECTICUT.

CARBURE'I'OR.

Application filed April 27, 1927. Serial No. 186,986.

My invention has for its object to provide a carburetor having provisionfor forcing a supply of gaseous mixture the engines cylinders instead of depending upon the suction created during the suction stroke of the engincspiston. In carburetors such as heretofore used, which depend upon the suction of the engine to charge the cylinders, when a car is climbing a hill. and the pistons move up and down at a slow speed the suction of the gasoline proportionally slower, at the very time the cyliiidelsneed the most gasoline and thus they receive a leaner mixture than should be supplied to the cylinders in order to maintain the most effective operation; my invention therefore has for an object to provide means for charging the cylinders independent of the suction stroke of the piston.

The invention also has for its object to provide means by which the usual vacuum tank may be dispensed with and the carburetor itself function to maintain a supply of gasoline in the float chamber at all times.

lVith other objects in view the invention consists in providing a carburetor with a fan or blower for forcing air past a Venturi tube through the neck of the carburetor into the engines cylinders, thereby atomizing the gasoline drawn from a reservoir through the Venturi tube; means are provided for regulating the feed of air in conjunction with the throttle action, and the usual float and needle valve is provided for maintaining a constant level of gasoline in the outlet reservoir; invention also resides in the provision of a vacuum'device for drawing the gasoline from the storage tank (located at a lower level) and feeding it into the float chamber of the carburetor when the needle valve is open, thus maintaining a constant supply of atomizable fluid in the carburetor.

The invention furthermore resides in these novel details of construction, combination and arrangement of parts, all of which will be first fully described, then be particularly pointed out in the accompanying drawing, in which:

Figure 1 is a perspective view of a carburetor employing my invention and showing the connection between the t rattle valve and the air inlet shutter or a pled with the intake manifold (not shown) Figure 2 is a vertical longitudinal section of the same.

Figure 3 is a diagrammatic side elevation showing the use of an electric .motor for driviijig the fan, this being an arrangement especially adapted when the carburetor is to be used in connection with fuel burners.

In the drawing in which like numerals of reference indicate like parts in all the figures, 1 represents the float chan'iber, 2 the outlet reservoir, 3 the Venturi tube through which the gasoline is drawn from the outlet reservoir 2 into the neck 4!: of the carburetor.

The neck 1 is flangcd at 5 so as to be conand the neck 4. is provided with the usual butterfly throttle valve 6 that is operated by a suitable operating rod 25 in the ordinary A sediment cup 7 is provided beneath the float chamber 1 and communicates with that chamber through a duct having a needle valve seat 9 with which the needle valve 10 that is controlled by the float 11 cooperates. The construction of the needle valve and the float may be of any of the usual types and per se constitutes no part of the present invention.

A port 12 is provided between the float chamber 1 and outlet reservoir 2 so that the level of gasoline in the reservoir 2 may be maintained constant by re-supply from the float chamber.

13 designates the fan or blower chamber having an outlet throat 1 1 connecting with the neck 4 and the chamber 13 provided with a cap 15 having ports 16 as shown. 17 is the shaft outer bearing on the cap 15 in which. the blower or fan shaft 18 is iournailed, the shaft 18 carrying the fan or blower 19 and projecting into a bearing 20 at the inner end as shown best in Figure 2 of the drawing.

21 is the shutter-valve which ported to register with the ports 16 when in one position and. to close those ports when in another position, the shutter 21 having a handle 22 connected by a: bell crank 23 with the throttle the latter-having a valve seat 28 to cooperate V with the check valve'29. The check valve is operated by a float 30 in the chamber 27. Spacing lugs 31 are provided within that chamber so that the float 30 may not close the entrance to the chamber through which the stand pipe 32 effects communication with the interior of the chamber. The stand pipe 32 is coupled at 33 and 34 with the sediment chamber 7 and supply line 35 respectively, back check valves being provided at the couplings 33 and 34 (or at any other suitable point in the connection between the stand pipe 32 and the supply or storage tank).

The check valve 29 is preferably provided witha duct 36 having two ports 37 and 33,

'thefport 38 always communicating with the interior of the chamber 27 and the port 37 communicating alternately with the port 39 .that delivers into the'vacuum or suction pipe 26 and the port 40 which communicates with atmosphere, the communication between 37 and 40 occurring via the recess 41.

In-operation, power is applied to the shaft 18 by means of a pulley 42, see Figures 1 and 2, or an electric-orother suitable motor 43, see Figure 3, so as to force air through the throat 14 and neck 4 to the engines cylinders. The action of this air causes-a partial vacuum in the outlet end of the Venturi tube 3 and also at the end of the pipe :26 that communicates with the throat 4. This partial vacuum causes gasoline to be drawn through'the Venturi tube and vaporized andmixed with the air that is being forced to the engines cylinders to produce the required charge. The partial vacuum producedalso causes suction in the pipe 26 which, when the float 30 is down and the valve is set to eil'ect communication between ports 39 and 37, will draw gasoline from the storage tank into the stand pipe 32. As the float 30 rises the communication between 7 ports and 39 will be terminated and the interior of the reservoir '27 will be connected with the atmosphere through port 40, thereby permitting the gasoline in the stand pipe 32 to flow by gravity into the float chamber 1 in'the event that the needle valve is off its seat. As soon as the float has again closed the port and the level of gasoline in the stand pipe has loweredsufliciently to bring the ports 37 and 39 into communication again the operation of drawing a supply of gasoline from the storage tank in the stand pipe will be repeated.

Not only may this invention be used in connection with carburetors in internal combustion engines, but it can. be used to produce a burning mixture for oil fuel burners and the like as diagrammatically indicated inFigure 3 of the drawing. 7

From the foregoing description, taken in connection with the accompanying drawing, it is thought the complete construction, operation and advantages of my invention will be clear to those skilled in the art to which it relates.

lVhat I claim is:

1. A carburetor comprising a float chamber having an inlet and a float controlled needle valve associated with the inlet, a neck constituting a mixing chamber, an outlet reservoir in communication with the float chamber and including a delivery tube comimmicating with said ncck, said carburetor also including a blower chamber and a blower for forcing air into said neck adjacent the tube, a shutter valve controlling the air admission to the blower, a throttle valve in the neck, a connection between said throttle valve and said shutter valve whereby manipulation of the throttle valve will cause corresponding manipulation of the shutter valve, said carburetor including a, vacuum chamber, a suction pipe connecting the vacuum chamber with said neck, a stand pipe communicating with the vacuum chamber and with said float chamber through the needle valve opening, a connection between said stand pi pc and the source of liquid fuel. supply, and a float controlled valve in said vacuum chamber for the purposes described.

2. In a carburetor, the combination with the float chamber having an inlet controlled by a needle valve and float, a neck constituting a mixing chamber,'an outlet reservoir in communication with the float chamber, a tube effecting coimi'mnication between the outlet reservoir and the neck, a blower chamber, a blower mounted in said blower chamber, means for'driving said blower, controlled means for admitting air into said blower chamber, said carburetor including a'tliroat between said blower chamber and said neck through which the air is forced by said blower, a throttle valve in said neck, means for controlling the admission of air into said blower chamber, means connecting said air admission controlling means and said throttle valve for simultaneous operation, a vacuum chamber, a stand pipe connecting said vacuum chamber with the inlet port of said float chamber, a back check valve in said connection, means connecting said stand pipe with the source of fluid supply, means connecting said vacuum chamber with said neck, said last named means including a vacuum-float check valve.

3. In a carburetor, the combination with the float chamber having an inlet controlled by a needle valve and float, a neck constituting a mixing chamber, an outlet urscrvoir in communication with the float chamber, a tube eflecting communication between the outlet reservoir and the neck, a blower chamher, a blower mounted in said blower chamber, means for driving said blower, controlled means for admitting air into said blower chamber, said carburetor including a throat between said blower chamber and said neck through which the air is forced by said blower, a throttle valve in said neck, means for controlling the admission of air into said blower chamber, means connecting said air admission controlling means and said throttle valve for simultaneous operation, a vacuum chamber, a stand pipe connecting said vacuum chamber with the inlet port of said float chamber, a back check valve in said connection, means connecting said stand pipe with the source of fluid supply, a suction duct connecting said vacuum chamber with said neck, said last named means including a vacuum-float check valve, said check valve comprising a float member, a valve stem having a passage with a port adapted when said valve stem is in one position to efi'ect communication between said vacuum chamber and the suction duct connecting the vacuum chamber with the neck and when in another position to close off such communication and eliect communication between the interior of said vacuum chamber and the atmosphere for the purposes described.

JOHN J. LANGDON.

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