US1776192A - Carburetor - Google Patents

Description

Sept. 16,. 1930.

J. A. PERRY CARBURETOR Filed June 6. 1928 'Patented Sept. 16, 1930 JOHN ARTHUR PERRY, OF MAIDSTONE, VICTOBIA,"AUSTBALIA CARIBURETOR Application filed June 6, 1928, Serial No.

This invention relates to carburetors fixed and its objects are to provide an improved carburetor in which the liquid fuel is thoroughly vaporized and filtered. before the gas formed by the admixture of liquid fuel and air is admitted to the cylinder or cylinders of the engine, and to maintain ity of mixture or gas.

The invention is illustrated-by the accompanying drawings, whereof, Figure l is a longitudinal vertical sectio of a practical form of the invention.

Figures 2, 3 and 4 are plan view-s of baffle. plates, shown in Figure 1.

Figure 5 is a plan of a choke. According to these drawings the float chamber 1. is located adjacent a cylindrical preferably formed integral with a standard qual the same. I The liquid fuel passes from the float chamber down an outlet passage 8 formed in the bottom 4 of said chamber and opening into a well or trap-5 below its lower end, which well is in communication with an inlet passage 6 formed in the bottom 7 of the casing 2, said inlet passage being upwardly inclined and communicating with the fuel jet or nozzle 8 in the casing.

By means of this construction any water in the fuel will drain from both passages 3 and 6 into said well 5. The latter is closed at the bottomby a hollow screw plug 9 in alignment with passage 3 and can be removed to empty the well and permit the passage 3 being celared of any foreign matter or obstruction.

For the purpose of facilitating the cleaning of passage 6 the wall of the well is formed with a hole normally closed by a screw plug 10 in alignment with passage Adjacent the discharge end of the fuel jet 8 is an automatically adjustable choke l1 normally retained on a seating 12 formed in the wall ofthe casing 2 by a spring 13. Said choke is formed with a central annular upturned mouth 14 which is flared towards its lower or inletend, and around said mouth is an annular Well 15.

The upper discharge end of the fuel jet 283,279, and in Austral ia June 14, 1927.

is located. within the mouth of the choke, and to and used in internal combustion engines,"

charge end of the jet and the choke.

It may be stated at this point, that the lifting of the choke 11 does not increase the air supply area, but actually reduces the suctionof the petrol supply; that is to say, the mixture is proportioned by the intensity of the suction. If the choke is lo'wer, tluamount of fuel drawn up willbe greater than when it is lifted, according asthe area of the orifice in the choke is, or isnot in close proximity to the jet,which is another way of saying that more air is admitted.

The purpose of the well 15 of the choke s to collect non-vaporized liquid fuel, which eventually isvaporized and becomes admixed Wltll the am,

The casing is provided above or in advance .of the fuel jet and the choke, with a central primary baflle 18 formed with radial lugs 33 (Fig. 4) supported on a seating 23 in the wall of the casing. Said balfle is located above orin advance of the annular lip 43 of the mouth of the choke and there is an the well 15;

Surrounding the inner baffle-18 is another or outer baffle 22 formed with radial lugs 34 (F ig. 8) which rest on lugs 33 and are secured by screws 34*, said baffle 22 being of conical section, i. e., it tapers interiorly towards its mouth 24 and'is formed with a series of annular serrations or steps 25, the edges of which arepreferably parallel with those of the bafiie 18. Around the mouth 24 is an annular well 44 that collects any nonvaporized fuel.

The combustionmixture or gas passing through the passage 1-9fbetween the. inner face of the first or course is deflected tangentially toward the lower edge of saidbaflle. It is then drawn up and outer baffles is again subjected to a swirling action which tends to improve said mixture further, as well as to remove non-va porized liquid; and finally the mixture meets still a third baffle 26 arranged transversely of the casing at a distance from the mouth of baffle 22. This b aille 26 rests or abuts against theedge of the cylindrical casing* 40 of baffle 22 and is formed with a ring of outlets 27, while its central non-perforated portion 28 is located'above or centrally, in advance of the mouth 24: of baffle 22, and is preferably made concave as at 29"o'n'tlie underside, said baflie being the final one einployed to ensure and inaintaina standard quality ofniixture or It will be understood that if there is any non-vaporized fuel still in the mixture it will strike the concave surface 29 of the central portion 28 and that any striking the serrations 25 of baflie 22 will drip into well which is in alignment with the entrance of passage 19. i

In advance'of the baffle 26 within the casing is the usual butterfly or other valve 30 controlling the supply of the combustible mixture to the cylinder or cylinders of the engine.

he choke l1 may be guided in its movements by means of arms 31 connected to a collar 32 slid-able on the jet 8.

i According to the construction described the mixture of liquid fuel and airis drawn by suction through the automatic choke 11 and impinges against the serrated interior surlower baffle 18 wherein its through the second or intermediate baffle 22, the effect of the serrations on the surface of that battle being to impart a centrifugal motion to the gas or mixture which thereby precipitates any unvaporized fuel or other liquid into the well 15 and prevents it from passing to the induction pipe and cylinders. The baffle 26 completes theadmixture of the fuel and air which passes through valve -to the intake manifold of the engine. 7

It must be understood that the invention is also applicable to a carburetor disposed in a horizontal or inclined position.

I claim: v

1. In a carburetor, a casing havingan air inlet, a fuel jet therein, a hollow conical baffle located centrally of said casing and fuel jet and in advance of the latter, the interior wall engines, a casing 'et'therein, a movable ad ustable choke con trolled by the engine suction and 'iiular well, an inner conical located centrally of said casing and fuel jet and in advance ofthe latter, the interior wall of said baflle being formed with serrations, and another baiile of conical section located outside the first one and formed with a central mouthsurrounding the same, with a passage between said baffles, the interior surface of theouter b'afll being formed with serrae tions, said outer bafllc being provided around its'mouth with a well.

3. Ina carburetor for internal combustion having an an inlet, a fuel provided .w1th an annular we'll,"and inner and outer battles, one within the other,w1th an annular conical passage between the same in alignment with the well of said choke.

at. In a carburetor for internal combustion engines, a casing having an air inlet, a fuel jet therein, a movablechoke controlled by the engine suction and'provided with ananhollow baffle above said, choke, and an outerconical section baiile provided with a centralmouth and "with a well around said mouth, the outer baffle surrounding the inner battle and spaced therefrom by an intermediate conical passage, each baffle belng formed on its interior surfaces with a series of steps.

5. In a carburetor for internal combustion engines, a casing having an air inlet, a fuel jet therein, a movable adjustable choke controlled by the engine suction and provided with an annular well, an inner conical hollow bafiie above said choke, an outer conical section baffle provided with a central mouth and with a well around said mouth, the outer bafiie surrounding the inner baffle and spaced therefrom by an intermediate conical passage between the baffles, each 'bafile being formed on its interior surfaces with aseries of steps, and a third baffle located transversely in the'casing and formed with a ring of outlets surrounding a central non-perforated portion formed on the underside with a concave surface."

In witness whereof I have signed this specification. Y

JOHNA. PERRY of said baffle being formed with s'errations,

and another baffle of conical section located outside the first one and formed with a central mouth surrounding the same, with a passage between said battles, the interior surface of the outer baflie'being formed with serrations.

*2. In a carburetor, afcasing havlng an air inlet, a fuel jet therein, a hollow. conical baflie

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