US1745325A - Vaporizing device - Google Patents

Description

. Jan. 28, 1930.

G. M. HOLLEY 'VAPORIZING- DEVICE Filed Dec. 20, 1926 2 Sheets-Sheet J WIIIIIIII- 6 01995 /V. H04; 5). I NV EN TOR.

ATTORNEY.

Jan. 28, 1930. G. M. HOLLEY VAPORIZING DEVICE Filed Dec. 20,1926 2 Sheets-Sheet INVEN TOR.

ATTORNEY Geanqz )1 H0145 Patented Jan. 28, 1930 GEORGE MJHOLLE'Y, F DETRQIT, MICHIGAN.

VAPGRIZING: DEVIGE Application filed December 20, 1926. Serial No. 155,992.

This invention relates to an improved fuel vaporizing device adapted to be used ,for supplying vaporized fuel and air to an internal combustion engine, in which a nonexplosive mixture is drawn through a mixing chamber diluted with air and thence into the cylinders of the engine.

The specific object is to increase the range so that the device will supply the minimum amount of fuel at the most economical mixture temperatures when the engine is running slowly under throttle, and, when running at a higher rate of speed with wide open throttle, a somewhat richer mixture at a somewhat lower temperature in order to give maximum power.

Figure 1 shows the preferred arrangement in elevation, partly in section.

Figure 2 shows a cross sectional elevation on the plane 2-2 of Figure 1.

Figure 3 shows in elevation a detail of Figure 1.

Figure 4 is a modification of Figure 2.

This application is based upon my c0 pending application Serial Number 7 51,819, dated August 28, 1928, filed November 24th. 1924, now Patent #1,681,937.

In the figures ii is themain air entrance,

B is an automatic air valve suspended therein, C is the mixing chamber, preferably of Vent-uri form. D is the throttle valve controlling the mixture outlet, which communicates with the inlet manifold E E. F is the exhaust manifold located below the inlet manifold. G is a cover plate forming the cover for an opening in the exhaust manifold F. 'H is the passage admitting the vaporized fuel into the mixing chamber C. J is the pipe connecting this entrance H with the cover G, or rather with the space formed between the cover G and vaporizing plate T. This plate T is of thin sheet metal and forms a heat transfer element between the exhaust gases 5 in F andthe liquid fuel between G and T, and is the subject of the Welch Patent, #1,.547A74, issued July 28th, 1925. This cover G has a depending portion I to which i the float chamber Xis attached in a well known manner. (As the detail ofthe con- O struction of the float mechanism is extremely well known it is not shown.)

A primary air passage is provided comprising a tube K that passes through the exhaust manifold F, and communicating with a horizontal passage L, drilled into the ex- 'haust manifold F. This passage L communicates through a tube M with the passage N, drilled into the lower portion of I. This passage N communicates with a vertical passage S, in which a fuel nozzle R discharges.

This fuelnozzle discharges at a point immediately above the level in the float chamber X. The passage S terminates opposite the exhaust heated metal plate T. A relatively wide flattened passage is formed between the thin metal plate T and the cover G, which passage communicates through J with the passage H.

Intermediate between the inlet and the outlet to this vaporizer passage T G, an aux iliary fuel and air passage U W enters which discharges additional fuel directly against the plate T. This passage U W is supplied with fuel from a second nozzle V, the outletof which is located at a considerable distance (1 or more) above the fuel level in the float chamber-X. Heated aspirating air for this nozzle V is supplied-by the cross passage Z connecting U W with M.

i The outlet from U into V, which communicates directly with the passage'T G, is controlled by a needlevalve Y. This needle valve Y is operated in any convenient way by the throttle'D. This throttle D may be provided, for example. with an eccentric O. which engages with a fork Q, which is bolted to the needle valve Y, whereby opening the throttle admits more fuel from .U into V.

Operation.-Whenthe engine is first started, and during the slow speed operation, the fuel is aspirated from the nozzle R into the passage S, where it is vaporized on the plate T. As the throttle valveD is opened the depression in C increases, so that the depression which is transferred through H to the inside of the cover plate G is sufliciently great to raise fuel to the height the nozzle V is above the float chamber X. By,correctly proportioning the taper of the needle valve Y, or substitutin a formed surface for the taper, it is possib e to get higher economy at intermediate throttle positions, and at the same time get the maximum possible power at wide open throttle. vFurthermore, as the transfer-of the depression from T G to V is determined by the relative area of the passage Z and the annular area between, the needle V and the assage U, it is possible to carefully adjust t e particular an flow at which the secondary nozzle V comes into ac- I tion.

It will be noted that the high speed fuel supply admitted past Y is not vaporized quite so much as the fuel aspirated from nozzle S, and hence the mixture. temperature at wide open throttle is relatively less than it would be if all the fuel were drawn out of the nozzle R, and the desired mixture temperature is obtained b changing the location of the exit W from tile passage U. A higher mixture temperature is obtained b lowering the location of W, as shown in igure 4.

What I claim is In a vaporizing device adapted for use in conjunction with an internal combustion engine, comprising an exhaust manifold having an opening therein, a plate covering said opening, a cover formin with said plate a vaporizing passage, a con uit communicating with said passage, means for admitting heated air to said conduit, a fuel nozzle discharging into said conduit, a vapor outlet from said passage, a second heated air conduit, a nozzle discharging into said second conduit, an exit from said conduit into said vaporizing passage located-in said cover intermeidate between said vapor outlet and said first conduit, a valve controlling said exit, a mixing chamber in which the vaporized fuelois diluted with air to form an explosive mixture, an air entrance leading thereto, said vapor outlet dischargin thereinto, a mixture outlet, a throttle va ve in said mixture outlet, means connectin said throttle valve with the valve controlfing the connection between the second conduit passage and the vaporizin passage, whereby the second conduit ra ually supplements the first conduit as the t rottle is opened. f

In testimony whereof I aflix mysignature.

GEORGE M. HOLLEY.

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