US1655902A

US1655902A - Carburetor

Info

Publication number: US1655902A
Application number: US703283A
Authority: US
Inventors: Griffon Gaston
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-04-07
Filing date: 1924-03-31
Publication date: 1928-01-10
Anticipated expiration: 1945-01-10

Description

QEEZMIM W 192% Y 1 555,9mm

G. GRIFFON CARBUBETOR Filed March 31, 1924 Patented Jan. 10, 1928.

1,655,902 PATENT OFFICE.

UNITED STATES GASTON GRIII'ON, F PARIS, FRANCE.

GARBUBETOR.

Application filed March 31, 1924, Serial No. 703,283, and in France April 7, 1928.

This invention relates to an improvement in carburetors, which has for its object to supply, when the engine runs with full power, a rich explosive mixture, and, in other a cases, the most economical mixture.

For this purpose, aregulating valve is arranged which is controlled by the .throttle valve for the gas mixture, and which is arranged in such a manner that it controls in m the interior of the constant-level fuel or float chamber the effect of the partial vacuum which is produced by the motor in the carburetor or mixing chamber, said device being combined in such a manner that in til the case, where the throttle valve is completely 0 en, this vacuum has a null or very feeble e eat in the interior of the said constant-level fuel chamber, and that it produces contrary effect, when the throttle an valve abandons this open position. In the carburetor of the invention, the constantlevel fuel chamber which feeds the atomizer or nozzle is connected with the carburetor chamber through the intermediate means of at an orifice that opens into a chamber which is open to the atmosphere and has connection with the said carburetor chamber by a duct branched from the latter, the opening and closing of said duct being controlled by a sliding sleeve valve of the Venturi type which is steered by the throttle valve for the gas mixture.

According to the present invention, this sleeve valve is connected with the throttle at valve by any kind of transmission suitable for sliding it within the carburation chamber, according to the movement which is given to the throttle valve and which per mite the following functions:

W (01.) When the throttle valve is closed, to connect-the carburation chamber with the constant-level fuel or float chamber in such a. manner that the partial vacuum produced by the motor in the carburation chamber comes to efi'ect in the constant-level fuel chamber and that the flow of fuel through the nozale will be the minimum.

(2').) ion the throttle is open to inter rupt this connection between the carburation W chamber and the constant-level fuel or float chamber, and, at the same time to permit an admission of supplementary or secondary air to the carburation chamber in such a manner that at high power run of the motor the depression or vacuum created by the mo ten in the oarburation chamber exercises a null or very feeble effect in the constant-level fuel chamber, and that the discharge of fuel to or flow of fuel through the nozzle, and, at the same time, the air draft or air supply in the carburation chamber reach their maximum.

In order to make the invention clearly understood, it is, in what follows, described n connection with the accompanyin drawmg, which, by way of example, s owe a vertical sectional view of an embodiment thereof.

In this drawing, the constant-level fuel chamber or float chamber is designated by the numeral 1. This chamber is in communication through an orifice 2 and with a chamber 3 which is open to the atmosphere by a vent or duct 4 and which is connected by a duct or short pipe 5 with the carburation chamber 6.

In the carburation chamber or mixing chamber 6 a slidin sleeve valve 7 is arranged which in t e present embodiment acts, at the same time, as a regulating valve and as a diffuser or Venturi mixer, and which slides with light friction within said chamber. This sliding sleeve valve is mechanically connected with the throttle valve 9 for the gas mixture, by means of levers l0 and 10 or any other suitable transmission means for longitudinally moving said sleeve valve according to the movements of the throttle valve 9 for the gas mixture. This sleeve valve is cooperatively connected with the throttle valve 9 in such a manner that it closes the duct 5 and interrupts the communication between the constant-level fuel or float chamber and the carburation or mixing chamber 6, when the throttle is open, as it is shown in the drawing. For this purpose the skirt of the sliding valve 7 has an opening 12 and a certain number of openings or holes 26. In the open position of the throttle valve 9, which is shown in the drawing, the opening or hole 12 does not coincide with the duct 5, so that the latter is closed by the upper of the valve skirt 7, while the openings 26 are coinciding with the outer openings or air inlets 27, which are arranged in the outer wall of the carburation chamber.

It will be understood that in this position the vacuum produced by the motor in the carburation or mixing chamber 6 cannot act upon in the constant-level fuel chamber, in such a manner that the pressure differential between the constant level chamber and the nozzle or atomizer is maximum, and conseuently also the output of or the flow of fuel t rough the nozzle.

It will be understood that the device of the invention permits in this position of the throttle valve, which corresponds to the H10- tor working high power, the admission of secondary air through the-

openings

27 and 26 of the carburation chamber and valve sleeve; this additional air increases the quantity of the air which is admitted through the center opening 28 of the sleeve valve permitting a sufiicient filling of the cylinders when the motor works with high power.

Finally, it will be understood that when the throttle valve 9 changes its open position, the air inlets 27, will be progressively closed, while the opening or orifice 12 comes to coincide with the duct 5. Under these conditions, the supplementary air supply is interrupted, while the constant-level fuel chamber is placed in communication with the carburation or mixing chamber 6, in such a manner that the partial vacuum which is produced by the motor in the carburation chamber es effect in the constant-level fuel chamber, and that the fuel supply of the nozzle is reduced to the strict minimum, which is necessary in order to assure the carburation of the air admitted through the central opening 28 of the diffuser 7.

The most economical regulation at reduced fuel supply is obtained for a given motor by varying the cross section of the orifice or vent 4, which determines variations in the values of the partial vacuums which prevail at 3 and 1.

For this pu ose the vent or opening 4 may be equippe with a needle valve or other suitable regulating means which permits regulation of the air passage, or it may be arranged in such a manner that it may receive a fixed plug which has an orifice of predetermined cross section, and which may be selected from a set of plugs having orifices of different. diameter so that they can be adapted to various motors, speeds, fuels, etc.

Finally, sleeve may that it is displaced the movable diffuser or Venturi or moves automatically for the above purpose by the difference of be so arranged in the carburetor the pressures, which exist on the two op 0- site faces of the diffuser or sleeve val i c which latter could be brought to the normal or resting position by a counterweight or by sprin Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. Carburetor for explosion motors, comprising a constant-level fuel chamber, a nozzle supplied with fuel by the fuel chamber, a carburation chamber having orifices for the admission of secondary air, a throttle valve for the regulation of the gas mixture, a'duct adapted for connecting the upper part of the constant-level fuel chamber with the carburation chamber, said duct having an orifice in communication with the atmosphere, a sleeve valve sliding in the carburation chamber adapted for controlling the opening and closing of the duct connecting the constant-level fuel chamber with the carburation chamber and the opening and closing of the secondary air inlet openings in the said carburation chamber, means for controlling the movement of the sleeve by means of the throttle valve in such a manner that when said throttlevalve is closed the sleeve valve closes the secondary air inlet openings, while, at the same time, permitting communication between the constant-level chamber with the carburation chamber, and that when the throttle is open the sleeve valve opens the secondary air inlets, while, at the same time, it interrupts the communication between the constant-level fuel chamber and the carburation chamber.

2. A carburetor, as above claimed, characterized in that the sleeve is constituted by a diffuser which is sliding in the carburation chamber, and has an opening which can be brought in line with the duct connecting the constant-level fuel chamber with the carburation chamber, and a second series of openings adapted to control the admission of secondary air to the carburation chamber when the duct connecting the latter with the constant-level fuel chamber is closed.

The foregoing specification of my improvement in carburetors, signed by me this 21st day of March, 1925.

GASTON GRIFFON.