US2414261A

US2414261A - Accumulator pump

Info

Publication number: US2414261A
Application number: US495921A
Authority: US
Inventors: Kalitinsky Andrew
Original assignee: United Aircraft Corp
Current assignee: RTX Corp
Priority date: 1943-07-23
Filing date: 1943-07-23
Publication date: 1947-01-14
Anticipated expiration: 1964-01-14

Description

" 1947. A.KALH1N$KY ACCUMULATOR PUMP Filed July 23, 1943 II I III FIGS FIG.|

INVENTOR (Maw mm" fl w ' ATTORNEY nests cross-passage Patented Jan. 14,1947

2,414,261 ACCUMULATIDR PUMP Andrew Kalitinsky, Eagleville, Conm, asslgnor to United Aircraft Corporation, Conn., a corporation of Delawarev {East Hartford,

Application July 23, 1943, Serial No. 495,921

Claims.

This invention relates to an injection apparatus of the accumulator type.

In accumulator injection apparatus, the chamis not operating.

Another feature of this invention is a circulation of fuel through the chamber during a part of the injection stroke and controlling this cir-= culaticn by the position of the plunger. Thus, a

termined position, lished from the chamber to the dischargepassage independently of the longitudinal position of the plunger. I p

Other-objects and advantages will be apparent from the specification and claims and from the accompanying drawing-which illustrates what is now considered to be a preferred embodiment of the invention.

Fig. 1 is a sectional view through the fuel injection apparatus.

Fig. 2 is a fragmentary sectional view showing the plunger at the start of the injection stroke.

Fig. 3 is an elevation of a part of the plunger. a bore l2 in which is a inlet port It admits fuel to the end of bore l2. During the injection stroke fuel is forced ,by plunger l4 into accumulator chambers I8 and through a groove 22 in a valve 24 and a crosspassage 26 connecting the accumulator chambers. Valve ft is slideable hi a bore 28 in a ring 30 in the casing.

2 34. One end of valve 24 is in line with a seat 38 While fuel is being forced into the accumulator chambers, valve 24 closes a passage 32 which con- 26 with the dischargenozzle cumulator chambers at the end of passage '32 and is held on this seat by pressure of fuel in the other end of the valve during the injection stroke of the plunger. Groove 22 permitsa throttled flow of fuel past valve 2t into the chambers. The end of valve 2% remote from seat 36 is conical to engage a seat 38 at the end of bore 28 and communicating with bore if, said seat closing the end of groove 22.

Air in the accumulator chambers I8 and 20 is vented through a passage 42 in ca ing. M which connects with the upper end of chamber ill. The opposite end of the passage forms a port 44 in a bore it which, during a part of the plunger stroke, is connected to a relief port to by an annular passage '48 formed by a reduced portion of the plunger. 7

Discharge of fuel through passage 32 to nozzle 3 may be controlled by a check valve 50 held against a seat by a spring 5 3. When accumu-- lator valve 24 moves to open passage 32, fuel pressure opens the check valve 50 and fuel is discharged past the check valve until the pressure of spring 54 is greater than the pressure difier-- ential holding the valve open. The check valve may have an integral plunger 56 slideable'in a bore 53 in nozzle 36 and the plunger may have a longitudinal groove 60 for flow of fuel past the plunger. Nozzle it has one or more openings 62 for discharge of fuel.

During the pumping stroke of the plunger from the position of Fig. 2 to the position of Fig. 1, the head of the plunger closes inlet port 16 :and the a movement of the plunger forces fuel into the acand through passage 42 and passage ill to relief port 46. As the plunger starts its stroke, the pressure of fuel on the end of valve 24 moves this valve against seat 36 to prevent escape of fuel past check valve 50 to the nozzle. I i

As the plunger continues its movement, an obliquely extending shoulder 64, forming the lower edge of passage 48 and extending substantially the entire circumference of the plunger,. closes port 44 and prevents further discharge of fuel from the accumulator chambers. Continued plunger movement raises the pressure of the fuel in theacculnulator chambers until a spill port 66 in casing I 0 is uncovered by a groove 68 in the plunger. This groove communicates with the end of bore I2 by a longitudinal groove 10, and when port 66 is uncovered, the fuel pressure at the end of the plunger is reduced suddenly causing valve 24 to move endwiseto open passage 32 for discharge of fuel from the accumulator chambers through the nozzle and to engage seat 38 to pre just the plunger r The plunger I the accumulator chambers. Ports chambers are forced vent escape offuel through groove 22. Accum lator valve 241s again moved to engage seat 38- when the plunger begins its next pumping stroke. 1 The quantity of fuel injected on each plunger stroke ,is controlled by turning plunger M to adered by shoulder ered, the greater ausaei I 4. Injection apparat having a-bore,-'a pump plunger reciprocable iii-the position at which port 44 is cov 64. The earlier the port is cov-.

the quantity of injected fuel. a

While port 44 is uncovered, any air bubbles col-:-

lected in chambers l8 and 20 are forced out passage 42 as fuel is pumped through the chambers.

Plunger l4 may be turned by endwise motion of a I rack, not shown. engaging teeth l2v on the. plunger.

may be turned angularly to permit complete filling of the apparatus with fuel before starting, independently of the longitudinal posl-- tion' of the plunger. Groove 48 in :the plunger has an intersecting is aligned with port 44 when groove 10 is aligned with inlet port l6. Fuel from port l6 enters bore I: through groove Stand flows past valve 24 to 44- and 46 are in communication and any air bubbles in the out through passage 42 around groove 48 to port 46.

It isto be understood that the invention is not limited to the specific embodiment herein illustrated and described, but may be used in other ways without departure from its spirit as defined by the following claims.

1. Injection apparatus comprising a casing having a bore, a pump plunger reciprocable in the bore, an accumulator chamber into which fuel is pumped by the plunger on the pumping stroke,- ports in said cylinder in a position to be covered by the plunger, one of the ports being connected the chamber and the other being arelief port, and a groove in said plunger connecting said ports during an initial part of the plunger stroke, an

' the bore, an accumulator to the axis of the plunger, and

- ports.

having a bore, a pump plunger reciprocable pumped by the plunger on active edge of said groove plunger varies the oint of the plunger stroke at which the'connection between the ports. is closed.

2. Injection apparatus comprising a casing having a bore, a pump plunger reciprocable in chamber into which fuel is pumped by the plunger on the pumping stroke, ports in said cylinder in a position to be covered y the p unger, to the chamber and the other being a relief port,

and a groove in-said plunger connecting said ports during an initial part of the plunger stroke, said groove extending obliquely means for turning the plunger in the bore for adjusting the point in .the plunger movement in which the active edge of said groove closes the connection between the an active edge of 3. Injection apparatus comprising a casing inthe bore, an accumulator chamber into which fuel is the pumping stroke,- po'rtsin said cylinder in a position .to be covered by the plunger, one of the and a groove in said plunger connecting said ports during a part of the plunger stroke to a now of fuel through the chamben an active edge of said groove extending obliquely to the axis of the plunger, said active edge closing the connection between the ports during the pumping stroke of the plunger,

extending obliquely to the axis of the plunger, whereby turning of the one of the portsbeing connectedv longitudinal groove 14 which bore; an accumulator chamber, a necting the 'end of the cylinder to the chamber through which fluid is pumped from adapted to be covered and uncovered by the plunger during its movement, opposed ports intersecting said bore and connected to a vent and to the accumulator chamber respectively, and a groove insaid plunger connecting,said opposed ports during an initial part of the plunger stroke, said groove and opposed ports being so arranged that the plunger covers the inlet port on the pumping stroke before the connection between .the opposed ports is cut off.

5. Injection apparatus comprising a casing having a bore, a pump plunger reciprocating in the bore, an accumulator chamber, a passage connecting the end of the bore to the chamber through which fluid is pumped from the bore to said-chamber, inle; and discharge ports intersecting said bore and adapted to be covered and uncovered by the plunger duringoits movement, op-

posed ports intersecting said here and connected to a vent and to the accumulator chamber respectively, and a groove in said plunger connecting said opposed ports during an initial part of the plunger stroke, an active edge of said groove extending obliquely to the axis 'ofthe plunger, and means for in the cylinder for adjusting the point at which the connection between 6. Injection apparatus including a casing having a bore, a pump plunger-reciprocating in said bore, an accumulator chamber connected with said bore and into which fuel is forced under pressure by said plunge:- on the-pumping stroke, a vent port in said casing, and a port connected to the accumulator chamber, said ports intersecting said bore in .a position to be covered'by the ports being connected to the chamber and the other being a relief port,

plunger, said plunger having a groove adapted,

during an initial part of the pumping stroke of.

the plunger, for establishing connection between said ports to cause fuel to flow through the chamber during'the first part of the stroke, an active edge of said groove extending obliquely to the axis of the plunger for adjusting the point at which said connection is cut off by turning the plunger.

. '7. Injection apparatus including a casing having a bore, a plunger movable in said bore, an

accumulator chamber communicating with said bore, inlet and outlet ports in said casing adapted to be covered and uncovered by the plunger during its stroke, a'groove in said plunger and a passage from the end of said plunger to the groove, said groove and passage connecting the end of the plunger'to the outlet port, opposed ports in said casing connected to a vent and to the accumulator chamber respectively, said plunger having a groove connecting said opposed ports during a part of the plunger stroke.

8. Injection apparatus including a casing having a bore, a plunger movable in said bore, an

accumulator chamber communicating with said bore, inlet and outlet ports in said casing adapted to be covered and uncovered by the plunger during its stroke, a passage fromthe end of said plunger to the groove, said groove and passage connecting the end of the plunger to the outlet port, opposed .ports in'said casing connected to a vent and to thereby cutting off the flow of fuel through the chamber.

the accumulator chamber respectively, said plunger having a groove connecting said opposed I comprising a casing passage con-- the cylinder .to said chamber, an inlet port in said cylinder turning the plunger withthe opposed ports is cutgroove in said plunger and a ports during a part of the plunger stroke, an active edge of said groove e tending obliquely to the axis of said plunger. V

9. Injection apparatus including a casing hava bore, a plunger movable in said bore, an accumulator chamber communicating with said bore, inlet and outlet ports in said casing adapted to be covered and uncovered by the plunger during its stroke, a groove in said plunger and a passage from the end of said plunger to the groove, said groove and passage connecting the end of the plunger to the outlet port, opposed ports in said casing connected to a, vent and to the accumulator chamber respectively,

plunger having a groove connecting said opposed ports during a part of the plunger stroke, the groove connecting said opposed ports being wide enough at one point in its periphery to establish connection between said opposed ports whenin a predetermined angular position independently of the position of the plunger longitudinally in the bore.

10. Injection apparatus including a casing hav- .Ing a bore, a plunger accumulator chambercommunicating with said bore, inlet and outlet ports in said casing adapted to be covered and uncovered by the plunger during its stroke, agroove in said plunger, a passage in the surface of said plunger extending from the end of the plunger to said groove, opposed ports in said casing connected to a vent and to the accumulator chamber respectively, a second groove in said plunger connecting said opposed ports'during a part of the plunger stroke, said second groove being wide enough for a portion of its periphery to establish connection between said opposed ports in one predetermined angular position of the plunger independently of the position of the plunger longitudinally of the bore, said plunger in said predetermined angular position aligning the passage insaid plunger with 20' the inlet port.

ANDREW KALITINSKY.

movable in sa'idbore, an