Патент USA US2406296код для вставки
Aug. 20, 1946. v R, J_ [FIELD ' 2,406,296 LIQUID FUEL SUPPLY DEVICE vFOR USE WITH INTERNAL V ' COMBUSTION PRIME MOVERS ‘ ‘ Filed Aug. 21, .1945 mvezvtozb I r" 1 . / 1 I Q Patented Aug. 20, 1946 2,406,296 ‘ ' UNITED . STATES/ PATENT-71 OFFICE" LIQUID FUEL- SUPPLY DEVICE FOR USE? WITH 1 INTERNALJJOMBUSTION PRIME . MOVERS . Richard Joseph I?eld, Birmingham, England, as-~ signor to Joseph ‘Lucas Limited, Birmingham, England ' ' Application August-21, 1945, Serial No.'611,754 In Great Britain July7, 1944. 5 Claims. (Cl. 103-44) 2 This invention has, for its object to provide an improved liquid fuel supply device for use with an internal combustion prime. moverof the kind having a fuel supply system which is fed by a pump, the latter ,derivingits motion from the prime mover. The purpose of the device is to supply an adequate initial charge to the system when starting the prime mover, the rate of actua tion of the pump. at that ‘period being normally inadequate and a supplementary supply device being, in vconsequence necessary. In the accompanying sheet of explanatory Assuming the larger, capacity‘ bodypart -c to have previously been ?lled with liquid fuel, and the valve m to be in the position shown in Fig ure 1 in which it ‘connects the hollow ‘stem d with the delivery passage 1‘ leading to the prime mover connection i, the setting of the pump in motion by actuation of thestarting motor of the prime mover, causes fuel to be supplied by the pump to the. adjacent end of the smaller capacity body "part 'b. The rate of this supply may be slow, but its effect on the piston q is to move the latter against the action of its loading springs 'in the direction for displacing the content of the‘larger capacity body part c alonggthe hollow stem 01 drawings: Figure 1 is a diagrammatic sectional side View of a liquid fuel supply device constructed in ac cordancewith the invention. 16 andvthrough a transverse passage t in the valve on Figure 2 is a fragmentary sectional view show ing the control valve inv a'di?erent position. Figure 3 is a view similar to Figure 1 illustrat ing a modi?ed form of the invention. In carrying theinvention into eilect as shown . in Figures 1 and 2, I employ a hollow cylindrical . to the connection i leading to the prime mover, openings u in the endof the stem remote ‘from the valve providing .the required‘ communication between the body part ‘c and the stem. This dis 20 placement is ‘made in su?icientvolume and at a sufficient rate to ensure the required adequate initial supply of liquid fuelfto the prime mover body a'having a pair of coaxial parts b, c of dif until the pump can'establish the. normal direct ferent internal diameters, and provided in its in supply. Meanwhile the piston lq slides along the terior with an axially arranged hollowstem d.v 25 stem 02 under thepressure of the liquid supplied In the outer end of the body part ‘b, whichis of by the pump, and when it approaches the end .of smaller internal diameter than the .body part c, ' its movement the small end of the piston uncovers are formed three passages e, 1‘, g whichat their ports 1; in the stem which allow ?uid to flow from outer endsterminate in connections h, z‘, y'for the pump into the stem and thence through the pipes (not shown) leading respectively to the sup ply pump, the primemover, and ya sump. The inner ends of the passages e, 1‘, y and theadjacent end of the hollow stem d are terminated by a valve ‘112 to the prime. mover. At the same time fuel can enter. the enlarging space between the larger ,end of the piston q and the inner end of the body part c from the passage g leading to the sump.. In this phase the valve m prevents direct intercommunication between the pump and sump passages e, 9. When it is required to stop the prime mover the valve m is turned to the position transverse bore 70 in the body part b, and in this bore is arranged a rotary valve. m adapted to effect the controls hereinafter described.‘ Also the inlet passage'e, that is, the passage, communir eating with the pump connection h, is provided shown in-Figure 2 ‘in which it cuts oil the con with a branch passagen leading to. the. adjacent nection with the delivery passage 1‘ and intercon end of the interior of thebody part b. Likewise 40 nects the pump and sump passages e, g and the the passage 9, that is, the passage ,communicat.-_ stem 01. The piston q now returns to its initial ing with the sumpconnectionj is provided with position. under the action of .the spring 5, and a branch passage 0, this being arranged incom while so doing liquid flows from the pump into munication with the adjacent end of the interior, the larger capacity bodypart c throughvthe stem of the body part c, and ‘beingprovided witha 45 d, therebyproviding the volume of liquid fuel to non-return valve 10. be used in the next starting operation .of.the prime Within the I body a is slidably ' arranged a mover. Duringthe. return of. the piston q the . stepped piston q consisting ‘of two parts ofv differ fuel previously drawn into the body part 0 past ent diameters situated respectivelyv in the. body the non-return valve p is displaced past the larger parts b, c. The pistonq isprovided with pack will) piston packing ring r. 1 ing rings 1‘ of U- or equivalent cross-section, and In addition. to thepassages above described, is loaded by a spring s arranged to. move the pis ton towards the end of the body a containing the valve m. The‘ mode of action is as follows: ‘ I preferably also. provide a balancing passage :1: in the smaller end of ,the piston q,.this balancing passage being ‘arranged‘toico-operate with the 60 ports 12 in the stem'd for putting ‘the latter into ‘ . 2,406,296 3. 4 formed at or near its closed end with ports 21 through which liquid can flow from the passage 3 communication‘ with the inner end of the body ‘ part 0 when the piston approaches the end'of _ H to the chamber 26 when the by-pass valve is its movement under the action of the liquid sup- ~ _ ‘ plied by the pump,rthus balancing the ?uid pres in an appropriate position. The initial position of the by-pass valve’ 25 is determined by an adjust ; sures on the two sides of the large end of the t able abutment 28 on which the valve rests under the'action of its loading sprin'g29. In this posi tion of the by-pass Valve 25 a restricted quantity munication between the delivery passage 1‘ and :r, _ of liquid fuel can flow through the ports 21 from the atmosphere or a drain when the supply of fuel ‘ the vpassage I] to the chamber '26 and thence to to the prime mover is cut o?l.) the by-pass passage 24. ' For enabling the valve m to eifect the controls ‘v It will be seen that the end of the automatic above described, the ends of the transverse pas valve 1 remote from its loading spring I6 is ex sage t in the valve are enlarged as shown. 1 piston, , Further’ I may provide in the peripheryv ? ; of the valve m a groove y‘for establishing‘com ‘ I ' T ‘ ' 10 posed to the fuel pressure inthe passage l1. / In the modi?ed construction shown in' Figure 3 When this pressure- rises’ to a predetermined " l I employ a body 2 which is provided withv inlet and delivery connections h1,>i1 for pipes (not v amount the automatic valve ‘I ‘opens and estab of the supply pump'and the prime mover: '-At a ‘ ~ l1; Ill." ' shown) leading respectively to they delivery-side;v ‘> _ lishes 'free communication between the passages '7 Therenlargement 48L of the bore 4 containing I the automatic valve 1 communicates with a con position adjacent to the outlet connection ‘i1 the " body 2 is bored to form a stepped cylinder a1, and in this cylinder is slidably arranged a stepped ‘ nection 30 for a pipe (not shown) leading to the suction side of the supply pump. Also the'bore enlargement 4EL is connected’ by a passage3 I‘ to a piston all,’ the latter being loaded by a spring 51. ~ Parallel with the bore -of the cylinder a1 there ‘ space'l32 in the body'2_ containing the rack 2| 7 ' and pinion 26] ‘associated with the throttle valve are formed in the body 2 three other and-smaller 1 ' bores 3,14, 5, and in these three bores are respec- ‘ tively arranged three slidable plunger-like valves ‘' 8‘. ,Moreover, the bore enlargement 4a is con let connection 2'1 and the passages 9, NJ is con- 1 ' the throttle valve 8 is formed with an axial bore ' V nected by another passage33 to one end of the bore3 ‘containing the control valve 6, the other’ V The ?rst bore 3 communicates with the outlet ‘ end of this bore (which contains the rack l3 asso-' connection ilyand is connected by passages 79,1 - Ill, to the larger end of the cylinder al‘and the‘ 30 vciated with the control valve) being in communi cation with a vent or drain opening 34. Further, second bore 4. Communication between-the out 35 for permitting access of fuel from the'pas trolled by the _valve_6 (herein termed the control 1 sage H to the remote end of the throttle valve, valve) which is slidable in the bore 3." The control 1 valve Bis operable by an external lever H through 1 35 vso that the ‘ends of this valve are subject to bal anced fuel pressures. a pinion l2 and a rack' I 3, or by any other suitable \ means. ' , 1 7 Assuming that the throttle valve 8v is open, the'larger-end of the cylinder a1 is ?lled with . At oneend the second bore, 4 communicates‘ liquidfuel, and the control valve 6 is in its open : with‘a passage [4 leading to the smaller end of the cylinder a1, and at or ‘near its other end this 40 position as shown in which the larger end of the cylinder communicates with the-outlet connec borelis formed with any enlargement >43. éThe‘ valve: 1 (herein' referred ‘to'as the automatic‘ ' tion ‘i1, the setting of the pump in motion’ causes fuel ‘to be‘suppliedrby the pump to the prime valve)-»in the bore 4 is loaded by a spring Hiev mover through the by-pass' valve 25 and the de situated in the bore enlargement 4a and acting‘ livery connection ail, the initial pressure of the 45 on a head'ltL on the adjacent end of’ the valve}, ‘liquid. fuel in the passage I‘! being insufficient to v The-other end of. the automatic valve 1 is of ' conical‘ or other form‘, and co—operates with an - openv the automatic valve 1, or to overcome the ‘ spring .91. As the pump. accelerates’ the difference ' annular seating or shoulder IS in the bore 4 for‘ controlling communication between the passages. m in the ?uid pressures acting 'on opposite sides of ' the by-pass valve 25 increases until it reaches I0, 14.. value which causes ,the'by-pass'valve to close The third'bore 5-communicates‘with the inlet1 aquicklyiagainst the action of its loading spring 29. ‘ connection chi, and is connected at one end to‘ The consequential rise’ of pressure in the passage @ second bore 4‘ and the associated passage I4 by‘ I'Lby acting on the smaller end of the piston ql, another vpassage IT. The adjacent end of the valve 8 ,(herein termed the throttle valve) in‘ ' moves the latter against the action of its load- _ ing spring 81 and discharges liquid fuel from the the bore 5 is of conical or other form, and co-V larger end of the cylinder through the delivery ' operates with an annular seating or shoulder It1 connection 2'1. Further rise of pressure in the in‘ this bore for regulating the rate of ?ow of passage )l'l opens the automatic valve 1, enabling liquid fuel from the inlet connection 71.1 to the" the ,full supply of liquid fuel required by the passage ll. The throttle valve~8 is operable by. primelmover to ?ow from the passage l1 pastethe an external lever l9ithrough a pinion 20 and a automatic valve to the delivery connection 2'1. This rack 2!, or by any other suitable means. - r enables the piston 611 to return to its initial posi- ‘ ' To-permit a restricted quantity of liquid fuel tion,’ and the larger end of the cylinder a1 to - to?owfrom the passage I‘! to the passage It, be re?lledthrough the passage 9 with the volume of liquid fuel to be used in the next starting oper ‘ and thenceto the outlet connection i1 when the prime mover is being started, a by-pass passage ation of the prime mover. ' 24 is provided? between the passages 11, Ill, this ' The cylinder a1 is providediat the junction of its larger and smaller by-pass ‘passagelbein'g controlled .by a valve 25 r partjserwith a venting passage 36 to prevent en H. The by-pass valve 25' mayiconsist' as shown 70 trapped ‘air orleakage ?uid from interfering‘with ' the proper action of the piston ql. To stop the of a spring-loaded hollow ‘piston which'is slid responsive‘ to the liquid pressure in the'passagei prime‘ mover the control valve 6‘ is moved to its close'drposition in which it interrupts commuhie.v ablein a chamber 26 connecting the bypass pas‘ sage 24 to the passage l1,‘ and which has a closed end exposed to the interior of the last mentioned" passage, the peripheral wall of the piston‘ being cation between the delivery connection i1 and the , 76 passages 9, |ll,:and establishes communication 2,406,296 5 6 between the delivery connection and the drain opening 34. Simultaneously the passage IT is connected to the suction side of the pump by the passage connected to the larger part of the bore, and means for establishing communica tion between the said passages under the control way of another passage 39 in the body 2, a re~ cess 40 in the adjacent side of the control valve of the fuel pressure acting on the piston. ‘27. A liquid fuel supply device as and for the purpose claimed in claim 1, in which the fuel 6, the passage 33 in the body, the chamber 4*‘. and the connection 30. Subsequently the auto~ matic and by-pass valves 1, 25 return to their initial positions preparatory to the next starting operation. passage connecting the larger part of the cylin drical bore in the body to the delivery opening is formed in part by a hollow stem on which the 10 piston is slidable, the stem being formed with For enabling a small quantity of liquid fuel, . ports whereby the smaller part of the said bore su?icient for slow running of the prime mover, is connectible with the interior of the stem under to flow from the inlet connection hi to the pas the control of the piston. sage ll independently of the throttle valve 8, 3. A liquid fuel supply device as and for the any convenient by-pass passage 3'! is provided in 15 purpose claimed in claim 1, in which the fuel the body 2, this passage ‘being controlled by a passage connecting the larger part of the cylin- ' manually adjustable needle valve 38. drical bore in the bodyto the delivery opening By this invention I am able to effect the re quired initial supply of fuel to the prime mover is formed in part by a hollow stem on which the piston is slidable, the’ stem being formed with in a very satisfactory manner. The invention is 20 ports whereby the smaller part of the said bore not, however, restricted to the examples described is connectible with the interior of the stem un as subordinate details may be modi?ed to suit der the control of the piston, and the control different requirements. valve being of rotary form and arranged between Having thus described my invention what I one end of the hollow stem and the inlet and claim as new and desire to secure by Letters Pat 25 delivery openings. ent is: 4. A liquid fuel supply device as and for the 1. For usewith an internal combustion prime purpose claimed in claim 1, in which the means mover of the kind speci?ed, a liquid fuel supply for establishing communication between the liq device comprising in combination a body formed uid fuel passages includes a second valve respon with a cylindrical bore of two different diameters, 30 sive to the fuel pressure acting on the piston. and with liquid fuel inlet and delivery openings, 5. A liquid fuel supply device as and for the liquid fuel passages for connecting the smaller purpose claimed in claim 1, in which the means part of the bore to the inlet opening and the for establishing communication between the liq larger part of the bore to the delivery opening, a uid fuel , passages comprises in combination a stepped and spring loaded piston slidable in the 35 second valve responsive to the fuel’ pressure act bore under the action of liquid fuel/supplied un ing on the piston, and'a spring loaded by-pass der pressure to the smaller part of the bore from valve responsive to fuel pressure for providing a the inlet opening, a control valve movable to dif restricted communication between the passages ferent positions for establishing and interrupting when the second valve is closed. communication between the delivery opening and 40 RICHARD JOSEPH IFIELD.