US3587970A - Fluid injectors - Google Patents

Fluid injectors Download PDF

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Publication number
US3587970A
US3587970A US811916A US3587970DA US3587970A US 3587970 A US3587970 A US 3587970A US 811916 A US811916 A US 811916A US 3587970D A US3587970D A US 3587970DA US 3587970 A US3587970 A US 3587970A
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United States
Prior art keywords
fluid
injector
return
valve
discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US811916A
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English (en)
Inventor
David Tindall
Arthur Michael Needham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spectus Energy Ltd
J AND T ENGINEERS ASCOT Ltd
Original Assignee
J AND T ENGINEERS ASCOT Ltd
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Filing date
Publication date
Application filed by J AND T ENGINEERS ASCOT Ltd filed Critical J AND T ENGINEERS ASCOT Ltd
Application granted granted Critical
Publication of US3587970A publication Critical patent/US3587970A/en
Assigned to SPECTUS ENERGY LIMITED reassignment SPECTUS ENERGY LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). OCT. 13, 1981. Assignors: SPECTUS OIL BURNER LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
    • F23D11/26—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space with provision for varying the rate at which the fuel is sprayed
    • F23D11/28—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space with provision for varying the rate at which the fuel is sprayed with flow-back of fuel at the burner, e.g. using by-pass

Definitions

  • the invention comprises a fluid injector including a changeover valve selectively movable into one position in which to condition the injector for fluid discharge and into another position in which the injector is conditioned for nondischarge but conditioned to accept a continuous circulation of fluid through itself when in said nondischarge condition.
  • PATEN'T'EU JUN28 r911 SHEET 2 [IF 3 & vat a nut m5 Q 7 A Q A v a f /X mm m z. A M Q R mm N F Q M in H m R R Q m 0 MM. Wm YW 1 Q r 8 E: .5 Iv wv Reva my Q w DAVID T'INDQLL,
  • a fluid injector including a changeover valve selectively movable into one position in which to condition the injector for fluid discharge and into another position in which the injector is conditioned for nondischarge but conditioned to accept a continuous circulation of fluid through itself when in said nondischarge condition.
  • FIG. I is a schematic sectional side elevation of a fluid injector when shut off
  • FIG. 2 is a similar view of the same injector when shut off, which shows the introduction of additional fluid circulating within the injector;
  • FIG. 3 is a similar view of the same injector when operative to discharge fluid
  • FIG. 4 is a similar scrap view showing the injector in the discharge condition, but with the changeover valve thereof in a different position, so as to regulate the quantity of discharged fluid;
  • FIG. 5 is a scrap section to a larger scale showing the forward end of the injector ofthe preceding FIGS.;
  • FIG. 6 is a scrap section to a larger scale showing in constructional fonn the rear end of the same injector coupled to a means for adjusting the position of the changeover valve.
  • the fluid injector is primarily intended for incorporation in an oil fuel burner suitable for use in an oil fired boiler. Such burners are arranged in the furnace walls of the boiler for firing the boilers fuel. Oil fuel is used as the prime fuel for firing burners, or as a secondary fuel for igniting coal when that is the primary fuel.
  • the boiler would generate steam, and have land, marine or other industrial applications.
  • the fluid injector includes a multipart barrel 1 supporting at its forward end an atomizer assembly 2.
  • the barrel would be suitably mounted in the wall of the boiler with its forward end inset from the boiler interior.
  • the atomizer assembly 2 com prises an orifice plate 3, a swirl plate 4 and a distributor plate 5.
  • the distributor plate abuts a cylindrical body 6 which is secured at its rear end to a multipart central tube 7.
  • a tip sealing valve 8 is slidably mounted within the body 6, and is biased forwardly by a spring 9. When there is no fluid supply to the injector, the bias of the spring 9 is sufficient to urge the valve tip 10 into a discharge orifice 11 in the orifice plate 3 and so close that orifice. Normally, fluid is continuously supplied to the injector, and the position of the tip sealing valve 8 is controlled by the differential as between the supply and return pressure ofthat fluid, as will appear.
  • the barrel 1 includes fixed oil fuel inlet and return pipes 12 and 13 respectively. Those pipes would be coupled into a suitable oil fuel delivery and return circuit, the details of which may be conventional and form no part of the present invention.
  • a changeover valve 14 is axially slidable within the central tube 7, and a control sleeve 36, and is movable between positions in which to effect oil flows within the injector as indicated by the arrows in the various FIGS.
  • valve 14 in relation to ports 27, 28, also controls the relative proportions of fluid discharge through the discharge orifice 11, and fluid spill return flow through the central tube 7 when the tip valve 8 is open, and of fluid continuously circulated within the injector when the tip valve 8 is closed.
  • the valve 14 comprises a spool having a land 29 in sliding engagement with the central tube 7, and lands 30, 31 in sliding engagement with the control sleeve 36.
  • the lands 29, 30, 31, define therebetween chambers 32, 33.
  • the chamber 32 is maintained in communication with the duct 15 by an aperture 35 provided between the control sleeve 36 and the central tube 7.
  • Another chamber 34 is defined between the land 31 and a closure member 37 serving to close the rear end of the injector and make a liquid seal with a plunger 38 of the valve 14. That plunger would be operative manually or be connected to any suitable power means such as an electrical solenoid or air cylinder so as to be reciprocally movable under selective control.
  • the ports 27, 28 are provided in the wall of the control sleeve 36, and ports 26 are provided in the wall of the central tube 7.
  • the land 29 is positioned behind the ports 26 having direct communication with the fluid supply pipe 12 so that fluid will flow from that pipe via the ports 26 and into the central tube 7 to pass therealong towards the atomizer assembly 2.
  • a return path from the duct 15 to the return pipe 13 is provided by way ofthe aperture 35 and the ports 27, such that the fluid will return from the duct 15 via the aperture 35 into the chamber 32 and pass therefrom via the ports 27 into the return pipe 13.
  • additional circulating flow may be introduced by connecting a central bypass passage 39 in the valve 14 via the chamber 33 to the ports 28 so that the fluid will pass therefrom into the return pipe 13. Care must be taken to ensure that the fluid flow returning from the duct into the return pipe 13 is not reduced, when the valve 14 is moved inwardly to introduce additional circulation within the injector.
  • the changeover valve 14 is moved inwardly to the position shown in FIG. 3 in which the land 29 lies forwardly of the supply pipe 12 and the ports 26 to interrupt communication between those ports 26 and the forward region of the central tube 7. Instead, the ports 26 com municate with the chamber 32 with the result that flow will occur into that chamber 32 and exit therefrom via the aper ture 35 into the duct 15.
  • Return from the atomizer assembly 2 takes place via the central tube 7 to the land 29, and then through the central passage 39 in the valve 14 and ports 40 therefrom into the chamber 33, to exit via the ports 27 into the directly registering return pipe 13.
  • the fluid spill return flow into the return pipe 13 can be regulated to obtain a corresponding variation in the discharge flow.
  • a lesser fluid spill return flow and hence a greater discharge flow is obtained by moving the changeover valve 14 inwardly, so that the land 31 is caused to interfere with the fluid spill return flow from the chamber 33 via the port 27 into the return pipe 13.
  • This fluid spill return flow can be shut off entirely by continuing to move the changeover valve 14 inwardly until it is in the position shown in FIG. 4. At this position the discharge flow will be a maximum for a particular size of discharge orifice 11, and a particular supply pressure.
  • the distribution of fluid flow as between discharge and return for a particular size of atomizer is also determined by the diameter a of the central passage 22 and the size and number of passages 23 in the tip sealing valve 8.
  • An external adjustment mechanism permits independent regulation of both the quantities of discharged fluid when the tip sealing valve is open, and fluid continuously circulated within the injector when the tip sealing valve is closed.
  • the mechanism is so arranged that either adjustment can be made without interfering with the other setting.
  • an adjustment spindle 43 is in rigid connection with the plunger 38 of the changeover valve 14 at a power operative drive sleeve 44-.
  • the spindle 43 slides in an adjustment sleeve 45 which is part of the power operator support frame 46.
  • the spindle 43 is enclosed by a barrel 47 which is screwed in engagement with the sleeve 45.
  • the barrel 47 abuts adjustment nuts 48 which are also in screwed engagement with the sleeve 45.
  • Adjustment nuts 49 are in screwed engagement with the spindle 43 and form a land 50 which abuts a land 51 formed on the end of the sleeve 45.
  • a land 52 is formed on the end of the spindle 43, and a land 53 is formed inside the barrel 47.
  • the nuts 48 are screwed inwardly so that the barrel 47 which abuts them can be moved in.
  • the travel of the spindle 43 is restricted because the land 52 abuts the land 53, causing the valve 14 to move inwardly.
  • the fluid spill return flow is regulated, as shown in FIGS. 3 and 4, by the nuts 49 which abut the land 51, and they can be unscrewed allowing the spindle 43 a controlled inward movement.
  • An oil burner incorporating the fluid injector as described would also have an air register to provide the combustion air, a flame stabilizer to maintain the flame at the point where the fuel isinjected, valves to regulate and shutoff the air and fuel supplies, and an ignitor to initiate combustion.
  • the described fluid injector is advantageous in that during shutoff, fluid is continuously circulated through it to cool the injector and obviate the need for the injector to be retracted away from the interior of the boiler. Again, because of that continuous circulation, fuel cracking and blockage in the injector are obviated and there is no necessity for cleaning between discharge operations.
  • the tip sealing and changeover valves are self-contained units, which permits their easy removal for service or replacing; the ingress of dust into the valve system is prevented because the changeover valve is enclosed in the center tube as an integral part of the injector.
  • the fuel flow for a particular pressure can be maintained at constant volume when the injector is operated by presetting the circulating flow when the injector is in the shutoff condition; this feature is of importance in automatic boiler control since it permits taking-off and putting-on burners without disturbing the total fuel flow.
  • This feature is of importance in automatic boiler control since it permits taking-off and putting-on burners without disturbing the total fuel flow.
  • By providing for a regulated degree of fluid spill return flow during discharge a wider range of operation is obtained without reducing the quality of fuel atomization.
  • the construction of the injector also allows the use of second fluids to further increase the range of opera tion, for a single atomizer.
  • the components of the injector are so sized that the injector may be housed in standard carrier tubes.
  • Fluid injector means comprising: an injector body (1) containing a chamber (15) and including means defining inlet (26) and outlet (27) ports for connecting said chamber with fluid supply (12) and return (13) conduits, respectively;
  • fluid atomizer means (2) connected with an opening contained in said body, said atomizer means defining a discharge passage (11) communicating at one end with said chamber;
  • tip sealing valve means (8) for controlling the discharge of fluid through said discharge passage
  • changeover valve means (14) connected between said inlet and outlet ports for establishing first and second flow paths for operating said tip sealing valve means between closed and open positions, respectively, relative to said discharge passage;
  • said changeover valve means being further-operable, when said tip sealing valve means is in the open position, between a range of fluid discharge positions to vary the flow of fluid between said inlet and outlet ports and thereby produce a variable discharge flow through said discharge passage for a given fluid supply pressure applied to said fluid atomizer means.
  • each of said first and second flow paths include at least portions of said chamber, and further wherein the direction of fluid flow through said chamber in said injector body is reversed when said changeover valve means is displaced between the positions effecting shutoff and opening, respectively, of said tip valve sealing means.
  • Fluid injector means comprising:
  • an injector body containing a chamber and including means defining inlet and outlet ports for connecting said chamber with fluid supply and return conduits, respectively;
  • fluid atomizer means connected with an opening contained in said body, said atomizer means defining a discharge passage that communicates at one end with said chamber;
  • tip sealing valve means for controlling the discharge of fluid through said discharge passage
  • changeover valve means connected between said inlet and outlet ports for operating said tip sealing valve means between closed and open positions, respectively, relative to said discharge passage, said changeover valve means being further operable, when said tip sealing valve means is in the open position, between a range of fluid discharge positions to vary the flow of fluid between said inlet and outlet ports and thereby produce a variable discharge flow through said discharge passage for a given fluid supply pressure applied to said fluid atomizer means; and bypass means operable when said changeover valve means is in a position effecting closure of said tip sealing valve means to define a bypass passage affording limited flow of fluid directly from said inlet port to said outlet port, whereby a portion of the fluid bypasses said body chamber to provide continuous circulation of fluid through the injector means when in the nondischarge condition.
  • Fluid injector apparatus comprising:
  • injector body means containing a chamber and defining at one end a discharge passage (11);
  • tip sealing valve means controlling the discharge of fluid through said passage
  • said pressure differential means including a first fluid flow path to one side of said tip sealing means, a second fluid flow path to the other side of said tip sealing valve means, and first passage means (23) extending through said tip sealing valve means to afford communication between said two flow paths, said tip sealing valve means being responsive to a fluid differential between said two flow paths to close said discharge passage when fluid flow occurs through said first (7) to said second fluid flow path, and to permit fluid discharge through said discharge passage when fluid flow occurs through said second to said first fluid flow path, said first passage means being dimensioned to effect a pressure drop in fluid flowing therethrough from one fluid flow path to the other, said second fluid flow path containing second passage means (19) so dimensioned as to effect a pressure drop thereacross in the fluid flowing through said second path; said injector body means con taining in concentrically spaced relation therein a tubular internal body portion (6, 7) having a forward end adjacent said
  • changeover valve means (14) slidably mounted for linear movement within the rearward end of said internal body portion for movement between a first position in which said inlet and outlet ports are connected with said :first and second fluid flow paths, respectively, and a second position in which said inlet and outlet port means are connected with said second and first fluid flow paths, respec' tively.
  • a fluid injector wherein said tip sealing valve means has a large diameter section D and a smaller diameter section d interconnected by a shoulder, a chamber being defined to one side of said shoulder, said chamber being interconnected with said second flow path defined externally of said body to expose said shoulder to the pressure of fluid in said second flow path.
  • a fluid injector including first and second fluid flow passages in communication respectively with the opposite sides of said tip sealing valve, inlet connection port means in permanent communication with said inlet port, and return connection port means in permanent connection with said return port, said changeover valve being operable in a discharge position to connect said inlet connection port means with said first fluid flow passage and, selectively, said second fluid flow passage via said return connection port means with said return port by which to provide a discharge flow path for fluid and, selectively, a return flow path, said changeover valve being operable in a nondischarge position to connect said inlet connection port means with said second fluid flow passage and connect said first fluid flow passage via said return connection port means with said return port by which to provide a flow path through the injector along which fluid can circulate when the injector is in a nondischarge condition.
  • a fluid injector according to claim 13 wherein said fluid flow passage in the changeover valve, in a discharge position of said changeover valve, selectively communicates said second fluid flow passage with said first-mentioned return connection port means to complete said return flow path 15.
  • a fluid injector wherein said changeover valve is reciprocally slidable into its discharge and nondischarge positions, said changeover valve having a first land operable to connect said inlet connection port means either with said first or second fluid flow passage in depenl dence on the operative position of said changeover valve, said changeover valve having spaced-apart second and third lands defining therebetween a chamber in permanent communication with the fluid flow passage in the changeover valve and selectively communicable with said first-mentioned return connection port means to complete said return flow path or with said second return connection port means to provide said direct fluid return path.
  • a fluid injector wherein said third land is operable to interfere with said first-mentioned return connection port means to provide a varying restriction to return flow through that port means and hence a variable discharge flow through said discharge passage for a particular supply pressure applied to said inlet port, said third land, in the maximum discharge flow position of said changeover valve, shutting off said first-mentioned return connection port means entirely from said second fluid flow passage to prevent return flow and hence promote said maximum discharge flow.
  • a fluid injector according to claim 16 wherein said second land is positioned between said first and third lands and is operable in a nondischarge position of said changeover valve, when said inlet and return ports are not directly interconnected, to permit communication of said first fluid flow passage with both said first-mentioned and second return con nection port means.
  • a fluid injector according to claim 16 wherein said first land is slidably mounted in a tube means defining at least in part said second fluid flow passage, said inlet connection port means being provided in the wall of said tube means.
  • a fluid injector according to claim 23, wherein said changeover valve moves forwardly towards said discharge passage in moving from its nondischarge to its discharge position, and vice versa, and a permanent flow path is provided from the rearward side of said third land to said return port to enable, during rearward movement of said changeover valve, any fluid trapped at the rearward side of said third land to pass to said return port.
  • a fluid injector according to claim 1 including a power means connected to said changeover valve for selectively mounting said changeover valve into its discharge and nondischarge positions,

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
  • Nozzles (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
US811916A 1968-04-02 1969-04-01 Fluid injectors Expired - Lifetime US3587970A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1587968 1968-04-02

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US3587970A true US3587970A (en) 1971-06-28

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Application Number Title Priority Date Filing Date
US811916A Expired - Lifetime US3587970A (en) 1968-04-02 1969-04-01 Fluid injectors

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US (1) US3587970A (enrdf_load_stackoverflow)
DE (1) DE1915569C3 (enrdf_load_stackoverflow)
FR (1) FR2010457A1 (enrdf_load_stackoverflow)
GB (1) GB1231631A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844479A (en) * 1972-11-30 1974-10-29 Tectron Eng Ltd Fluid injector
US3862749A (en) * 1974-01-30 1975-01-28 Af Ind Metal slab conditioning system
US3900163A (en) * 1974-07-29 1975-08-19 Herbert W Volker Dispensing apparatus
US3985300A (en) * 1974-08-01 1976-10-12 Du Pont Of Canada Limited Self-purging injection valve
US4009688A (en) * 1974-03-04 1977-03-01 Toyo Kogyo Co., Ltd. Rotary piston type engine
US4378090A (en) * 1980-08-22 1983-03-29 Peabody Holmes Limited Fluid injector
US4416423A (en) * 1980-12-12 1983-11-22 Robert Bosch Gmbh Electromagnetically actuatable valve, in particular a fuel injection valve for fuel injection systems
US4705330A (en) * 1983-05-06 1987-11-10 Spectus Limited Fluid injectors
US5370315A (en) * 1993-10-15 1994-12-06 Del Gaone; Peter V. Spray gun for aggregates
US5618001A (en) * 1995-03-20 1997-04-08 Binks Manufacturing Company Spray gun for aggregates
US5695120A (en) * 1995-07-31 1997-12-09 Furon Company Spray gun
US20060124765A1 (en) * 2003-06-03 2006-06-15 Dirk Kothen Fuel injection nozzle
GB2486234A (en) * 2010-12-08 2012-06-13 Paul Maple A firestaff with a supply valve which allows fuel to pass when sufficient force is applied

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844479A (en) * 1972-11-30 1974-10-29 Tectron Eng Ltd Fluid injector
US3862749A (en) * 1974-01-30 1975-01-28 Af Ind Metal slab conditioning system
US4009688A (en) * 1974-03-04 1977-03-01 Toyo Kogyo Co., Ltd. Rotary piston type engine
US3900163A (en) * 1974-07-29 1975-08-19 Herbert W Volker Dispensing apparatus
US3985300A (en) * 1974-08-01 1976-10-12 Du Pont Of Canada Limited Self-purging injection valve
US4378090A (en) * 1980-08-22 1983-03-29 Peabody Holmes Limited Fluid injector
US4416423A (en) * 1980-12-12 1983-11-22 Robert Bosch Gmbh Electromagnetically actuatable valve, in particular a fuel injection valve for fuel injection systems
US4705330A (en) * 1983-05-06 1987-11-10 Spectus Limited Fluid injectors
US5370315A (en) * 1993-10-15 1994-12-06 Del Gaone; Peter V. Spray gun for aggregates
US5553788A (en) * 1993-10-15 1996-09-10 Binks Manufacturing Company Spray gun assembly and system for fluent materials
US5618001A (en) * 1995-03-20 1997-04-08 Binks Manufacturing Company Spray gun for aggregates
US5695120A (en) * 1995-07-31 1997-12-09 Furon Company Spray gun
US20060124765A1 (en) * 2003-06-03 2006-06-15 Dirk Kothen Fuel injection nozzle
US7963461B2 (en) * 2003-06-03 2011-06-21 Man B&W Diesel Ag Fuel injection nozzle
GB2486234A (en) * 2010-12-08 2012-06-13 Paul Maple A firestaff with a supply valve which allows fuel to pass when sufficient force is applied

Also Published As

Publication number Publication date
DE1915569B2 (de) 1977-08-25
GB1231631A (enrdf_load_stackoverflow) 1971-05-12
FR2010457A1 (enrdf_load_stackoverflow) 1970-02-20
DE1915569C3 (de) 1978-04-27
DE1915569A1 (de) 1969-10-30

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Owner name: SPECTUS ENERGY LIMITED

Free format text: CHANGE OF NAME;ASSIGNOR:SPECTUS OIL BURNER LIMITED;REEL/FRAME:003950/0761

Effective date: 19820105