US2915185A - Air dome and magnetic filter to automotive fuel pump lines - Google Patents

Description

Dec. 1, 1959 J. F. WALDHERR, JR ,1

AIR DOME AND MAGNETIC FILTER T0 AUTOMOTIVE FUEL PUMP LINES Filed Jan. 8, 1958 2 Sheets-Sheet l '7 A rroe/vs Y Dec. 1, 1959 J. F. WALDHERR, JR 2,915,135

AIR DOME AND MAGNETIC FILTER T0 AUTOMOTIVE FUEL PUMP LINES Filed Jan. 8. 1958 2 Sheets-Sheet 2 l 25 S 23 6 E2 25 INVENTOR. JOl/N KMLDHEEQ, J2.

ATTOE/VEX Am DoME AND-MAGNETIC FILTERI'T' AUTOMOTIVEIFUEL PUMP LINES:

John .Frwaldherr, Jr., Fairfield, lll., assignor to Air te x operative even when mounted upsidedown.

Pro'dilc'ts, Inc., Fairfield, 11]., a corporation of Illinois.

Application- January 8', 1958, Serial No. 707,760

4 Claims..- .(Cl. 210-422) device for use in connection with automotive fuel pumpss.

'mer 'eif'ects'l Ihe 'wallv carries at its .iipperm t.

The .commonly used automotive mechanical 'diaphra'gm;

fuel pump operates from an eccentric on the valve cam shaft on four cycle combustion engines. The rise of the cam shaft eccentric causes gasoline to be sucked into the pumping cavity of the fuel. pump itself through the action of rocker arm and linkage. On the return stroke of the cam shaft, the fuel is delivered to the carburetor. The same cycle repeats itself with rotation of the cam shaft. The usual installation requires a length of intake tubing of approximately twelve-foot length. Due to the fact that the intake stroke of the fuel pump is positive, it is necessary for the diaphragm to start to move the entire length of fuel in the intake fuel tubing, and stop as directed by the lift of the eccentric on the cam shaft. This interrupted flow causes momentary high negative pressures on the fuel in the intake line. It has been common practice to provide an internal air dome somewhere in the suction side of the fuel pump. This acts as a surge chamber. The surge chamber permits more uniform flow of fuel on the intake side of the fuel system and especially in the intake tubing. These internally constructed chambers permit the fuel to continue moving forward toward the fuel pump even though the pump has entered the delivery portion of its operating stroke. They also provide readily accessible supply of fuel and this plus the air within the surge chamber itself permit the fuel pump to deliver more fuel and reduce the peaks of negative pressure which tend to cause vapor formations in thenow commonly used highly volatile gasolines.

Certain fuel pump designs now in common use have omitted the above-mentioned internal surge chamber and as a result of the omission, these pumps are quite prone to excessive noise due to hydraulic hammer within the intake line, they are quite prone to causing vapor formation, they do cause excessive stress to be forced onto the entire pumping mechanism and especially the flexible diaphragm.

Accordingly, it is an object of the present invention to overcome the above difiiculties by means of an air dome serving as a surge chamber which may be readily inserted in a fuel line.

It is another object of the invention to provide a device which may be readily manufactured and conveniently maintained.

It is a further object of the invention to provide a device having magnetic filtering means incorporated therein.

It is a still additional object of the invention to provide a device having means for removing excess heat from fluid flowing therethrough.

It is a still additional object of my invention to provide a device which, although intended to be mounted the other port as the outlet.

4 2,915,185 Pate iiited: Pee. 1, 1959.1,

in a eel-tats*iipfigfii iasiticii; 'is" onst'ruc ted as' to be...

is surmounted ajtransparent; bowbandlb'ein apl'oviriediiwith inlet and outlet 'poi tsfandjj. bafile wallfl between the ports so that fluidenteriri'g themes strikes the batheand is diverted upwardly and thereover to thez outlet, j there-being. a Space above theitfiuid' level .providedby the bowl "'tjo danipen' outjpuls'ajtions and hydrauli ham t P rti n a magnet pastwhicha l s'i bstaiitial portion thegfueL must; flow in; contact withibot poles thatany excessive quantities of iron" oxide rials which exist in Further, the fe sting ifs Pro allel "array and so arrange installed it is preferably .pps withi'non'n j fio p O p g Y the radiator fan, whereby a cooling eifect bn fluid in my device is achieved. This is important since sometimes just a few degrees of temperature removal under conditions favorable to vapor lock will prevent vapor lock. Further, the construction of my device is such that it is completely symmetrical and may be connected in the system with either port serving as the inlet port and Finally, by a novel con figuration of the casting, should the device be connected in a fuel line in upside down position, that is with the air dome bowl below the body casting, an air dome effect will still be achieved.

A detailed description of my invention will now be given in conjunction with the appended drawing in which:

Fig. 1 is an elevation of the device.

Fig. 2 is an elevation taken at orientation from the direction of the view of Fig. 1.

Fig. 3 is a section through 3-3 of Fig. 1.

Fig. 4 is a section through 4-4 of Fig. 2.

Fig. 5 is a view of the bottom of the device; and

Fig. 6 is a view in the direction 6-6 of Fig. 4.

Referring now to the drawing, my invention comprises a main body casting,-for example a die casting 10, having exteriorally provided thereon a series of spaced par-' allel fins 14 of progressively varying area from center to sides. The body casting is provided with ports 18 and an internal bafiie wall 22 which is disposed transversely of the body between flow guiding parallel walls 23 aligned with the direction of fuel flow between ports 18 and forming bulbous chambers 24 with the external wall of the casting.

The body has a skirt 25 for locating a gasket 28 which seals the lower rim of a transparent bowl 31 secured on the body by means of a strap 34 having the iuturned flanges 37 engaging a depression 40 at the closed end of the bowl. The ends of the strap are brought down around the body to a nut element 43 which threadedly carries a bolt 46 abutting the lowermost portion of the casting and it will be apparent that rotation of the bolt tightens the strap to securely hold the bowl on the body.

The wall 22 extends upwardly into a yoke 49 having ends 50 which may be peened over to grip a round bar magnet 53 to secure the magnet within dome 31 and in the path of flow, between the ports 18.

Thus, it will be apparent that flow between the ports must for the most part contact the magnet ends, which are the poles, for the purpose of filtering out -by magnetic attraction any ferrous particles in the fuel.

In the event that an error in positioning is made at the time of installation, i.e., were the device to be mounted in an upside down position as compared with Fig. 3, fuel would still pass therethrough and air dome spacewould be aiforded by chambers 24 due to the bulbousnessof the body; Accordingly, a surge pocket of air exists when the device is mounted right side up and it even exists if, due to error, it is mounted upside Having thus describedmy invention I am aware that variouschanges maybe made therein without departing from the spirit thereof and, accordingly, I dolriot seek to be limited to the precise illustration herein given except as set forth in the appended claims.

1. In a device of the class described, a body having an external wall and a pair of spaced ports therethrough, a pair 'of spaced walls in said body extending between said ports, and an air dome element'icarried by said body and forming a'closed volume therewith, said body and said spaced walls forming an'air' dome when said device is installed in inverted position,

2.-In a'device as set forth in claim '1",-'in'cluding 'a.

baflle wall extending between said spaced 'wallsfand a magnet carried by said bafile wall.

3. In a device as set forth in claim 2, said ports being in axial alignment, said spaced walls' extending parallel to each other on respective diametrically opposite sides of said ports, said baffle wall extending in a direction normal to the axis of alignment of said ports and said -magnet being supported thereby beyond the confines of said body and within the volume of said air dome element.

4. In a device of the class described, a body having an external Wall and a pair of spaced ports therethrough, a pair of spaced walls in said body extending between said ports, and an air dome element carried by said body and forming a closed volume therewith, said body having chamber means formed by said spaced walls and said external Wall to serve as an air dome means when said body is inverted, said body having a plurality of spaced fins on the exterior Wall thereof extending externally of said body.

References Cited in the file of this patent UNITED STATES PATENTS

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