CN1955456A - Fuel injector - Google Patents
Fuel injector Download PDFInfo
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- CN1955456A CN1955456A CN 200610142840 CN200610142840A CN1955456A CN 1955456 A CN1955456 A CN 1955456A CN 200610142840 CN200610142840 CN 200610142840 CN 200610142840 A CN200610142840 A CN 200610142840A CN 1955456 A CN1955456 A CN 1955456A
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Abstract
A fuel injector includes a tube member and a valve element to slide axially in the tube member. The valve element includes a center portion and a plurality of plate portions projecting radially from the center portion, and each including side surfaces extending axially; and a guide section including an outer portion defining a valve seat, and an inner portion which is located on a radial inner side of the outer portion, and which is formed with at least one injection hole. The guide section is arranged to divert the flow of the fuel conveyed along the plate portions, to a radial inward direction toward the injection hole.
Description
Technical field
The present invention relates to fuel injector or Fuelinjection nozzle.
Background technique
A kind of fuel injector of known type comprises: valve base piece, and described valve base piece is formed with valve seat; The valve element, described valve element sliding type is put into pipe fitting, and is driven by drive segment, so that shift to and move apart valve seat; And spray nozzle board, described spray nozzle board is formed with one or more spray-holes, so that burner oil after in the gap of opening a way between fuel is by valve element and valve seat under the valve open mode.Open among the Japanese Patent Application No.2005-155547 that the Japanese Utility Model patent application gazette No.H03-108855 that the Japanese Patent Application No.H03-130571 that such fuel injector was announced on June 4th, 1991, on November 8th, 1991 announce and on June 16th, 2005 announce.Inside circumferential surface and hollow parts valve element between of fuel by pipe fitting that is fed in the pipe fitting carried, and after this directs into spray nozzle board and sprays by spray-hole.In the fuel injector of the Japanese Patent Application No.2005-155547 that is announced, the valve element comprises spherical valve body and the sliding parts that is supported by the pipe fitting sliding type.
Summary of the invention
In this kind of fuel sparger, the sliding parts of valve element, tends to disturbance fuel stream, and therefore the fuel atomizing of spraying is produced adverse effect between the inner periphery surface of the side surface of valve element and pipe fitting between flow periods at fuel.
Therefore, the purpose of this invention is to provide a kind of fuel injector that promotes the fuel atomizing of spraying.
According to one aspect of the present invention, a kind of fuel injector comprises: pipe fitting, described pipe fitting comprise the interior thorax that passes through that is used for fuel; Valve seat, described valve seat are arranged in the downstream end portion of pipe fitting; Valve element, the described valve planning valve seat that becomes in pipe fitting, to slide to vertically and to slip away; A plurality of plate portions, described plate portion is arranged in the valve element, and is arranged to and can slides on the inner peripheral surface of pipe fitting, and plate portion extends radially with respect to the axis of pipe fitting, and each plate portion all comprises the side surface that extends along the axis of pipe fitting; Drive segment, described drive segment can be shifted to the valve element and move apart valve seat; Nozzle member, described nozzle member comprises at least one spray-hole, described spray-hole is positioned on the inboard of pipe fitting valve seat, and is arranged to spray the fuel that is allowed to by formed gap between valve element and the valve seat; And targeting part, described targeting part can make the fuel stream that is allowed to along plate portion flows turn round towards the axis of pipe fitting, and therefore fuel is directed into spray-hole.
According to another aspect of the present invention, a kind of fuel injector comprises: pipe fitting, described pipe fitting comprise the interior thorax that passes through that is used for fuel; The valve element, described valve planning becomes can slide between valve closed state and valve open mode vertically in pipe fitting, and the valve element comprises core; With a plurality of plate portions, described plate portion radially divides from central division and stretches out, and sliding type is engaged in the pipe fitting; With the guiding segmentation, described guiding segmentation comprises exterior portion and the inside part, above-mentioned exterior portion limits the valve seat that is arranged on the pipe fitting downstream end, and above-mentioned the inside partly is positioned at the radially inner side of exterior portion, and be formed with at least one spray-hole, described spray-hole is arranged to spray the fuel of carrying by formed gap between valve seat and the valve element, and the guiding segmentation is arranged to make the fuel circulation of carrying along plate portion to change to radially inner direction towards spray-hole.
Description of drawings
Fig. 1 is the sectional view according to the described fuel injector of the first embodiment of the present invention.
Fig. 2 is the amplification view of downstream end portion that the fuel injector of Fig. 1 is shown.
Fig. 3 A and 3B are that downstream end portion that the fuel injector of Fig. 1 is shown respectively is in the state of being located (valve closed state) and is not located the amplification view of state (valve open mode).
Fig. 4 is the planimetric map of nozzle member in the fuel injector of Fig. 1.
Fig. 5 is the transverse sectional view of crossing the valve element that Fig. 3 A middle conductor F5-F5 got;
Fig. 6 is the sectional view according to the nozzle member of the described fuel injector of the second embodiment of the present invention;
Fig. 7 is the amplification view that illustrates according to the downstream end portion of the described fuel injector of the third embodiment of the present invention.
Fig. 8 is the transverse sectional view of crossing the valve element that Fig. 7 middle conductor F8-F8 got.
The view of Fig. 9 experiment that to be the position that is illustrated as plate portion in the fuel injector that confirms the 3rd embodiment carry out the influence of the fuel atomization of spraying.
Figure 10 is the plotted curve that result of experiment shown in Figure 9 is shown.
Figure 11 is the amplification view that illustrates according to the downstream end portion of the described fuel injector of the fourth embodiment of the present invention.
Figure 12 is the amplification view that illustrates according to the downstream end portion of the described fuel injector of the fifth embodiment of the present invention.
Embodiment
The first embodiment of the present invention is shown in Fig. 1-5.In first embodiment, the present invention is applicable to fuel injector or the Fuelinjection nozzle that internal-combustion engine is used.Fig. 1 is that illustrating according to the described fuel injector of first embodiment seems by the longitudinal sectional view of plane incision, and extend along the axis of fuel injector on above-mentioned plane.Fig. 2 is the valve component ambient amplification view partly that the fuel injector of Fig. 1 is shown.Fig. 3 A and 3B are respectively that downstream end portion that the fuel injector of Fig. 1 is shown is in the state of being located (valve closed state) and is not located the amplification view of state (valve open mode).Fig. 4 is the planimetric map of nozzle member that the fuel injector of Fig. 1 is shown.Fig. 5 is the sectional view that the valve element crosses the line segment F5-F5 shown in Fig. 3 A.
As shown in Figure 1, fuel injector 1 comprises main body, and described main body comprises shell 2, pipe fitting 3, core pipe 5, yoke shape parts 13 and resin cap 16.
O-ring seals 18 is assemblied on the periphery of first end of pipe fitting 3, so that guarantee the without leakage connection between the enlarged of pipe fitting 3 and fuel pipe.Filter 21 is engaged in the upstream extremity of pipe fitting 3.Filter 21 comprises: tubular portion 21a, described tubular portion 21a are force-fitted in the major diameter segmentation of pipe fitting 3; Frame part 21b, described frame part 21b makes with resin material (as nylon or fluoro-containing plastic), and described resin material is than the material softer of pipe fitting 3, and frame part 21b and tubular portion 21a integrated type form (in this embodiment, passing through injection moulding); And mesh element 21c, described mesh element 21c is installed among the frame part 21b, and is arranged to allow fuel pass through.
In pipe fitting 3 inside, be provided with: core pipe 5; Valve element 6, described valve element 6 is in the downstream side of core pipe 5; With nozzle member 9, described nozzle member 9 is in the downstream side of valve element 6.Nozzle member 9 is single integral body (no seam) members.Valve element 6 slides between the nozzle member in being fixed on pipe fitting 39 and the core pipe 5 in the axial direction.
Nozzle member 9 is arranged in the downstream end portion of pipe fitting 3, so that the downstream end portion of closed pipe fitting 3.Shown in Fig. 2-4, nozzle member 9 is the cup shells that comprise end portion 9a and tubular portion 9b.In this embodiment, end portion 9a is the disc end portion, the downstream of the closed pipe fitting 3 of described disc end portion, and in the axial direction in the face of the valve portion 7 of valve element 6; And tubular portion 9b is cylindrical shape part 9b, and described cylindrical shape part 9b extends towards the downstream of pipe fitting 3 from the periphery of end portion 9a in the axial direction.In the inside of nozzle member 9, between disc end portion 9a and cylindrical shape part 9b, form some flank 9c.Nozzle member 9 is force-fitted in the pipe fitting 3, and the outside cylindrical surface of cylindrical shape part 9b is a tight fit in the inner cylindrical surface of pipe fitting 3.Disc end portion 9a is the form of thin plate, and in this embodiment, the wall thickness that above-mentioned thin plate has is the wall thickness less than pipe fitting 3.
The disc end portion 9a of nozzle member 9 comprises: the inside part, described the inside partly are formed with a plurality of spray-hole 9e; Exterior portion, described exterior portion are around the inside part, and qualification valve seat 9f; And outmost targeting part, described outmost targeting part is around the valve seat 9f of exterior portion.In this embodiment, the inside that is formed with spray-hole 9e partly is a core, the exterior portion of valve seat 9f is an annular portion, and described annular portion is around the inside part that comprises spray-hole 9e, and outmost targeting part is the annular portion around the exterior portion of valve seat 9f.In this embodiment, the inside part and exterior portion are towards the valve element 6 within and without zone of the vault part 9d of protuberance upwards at upstream side.Outmost targeting part is the part of annular flat, and the part of described annular flat centers on vault part 9d, and is configured as the annulus of picture combination between two concentric circles, as shown in Figure 4.
Each spray-hole 9e is the through hole that passes the wall of disc end portion 9a.In this embodiment, each spray-hole 9e tilts a little, so as with respect to axial direction along the direction burner oil that tilts a little towards the radially outward side.In this embodiment, each spray-hole 9e makes taper.For example, all direction is tapered towards downstream for each spray-hole 9e, so that the diameter of spray-hole 9e or cross-sectional dimension diminish to downstream open end gradually from the upstream open end of spray-hole.Perhaps, each spray-hole 9e can be towards party upstream to becoming convergent shape or direction enlarging towards downstream, so that the diameter of spray-hole 9e or cross-sectional dimension become big from the upstream open end of spray-hole gradually to downstream open end.
The annular exterior portion of the disc end portion 9a of nozzle member 9 has a upstream face, and described upstream face is towards valve element 6, and as ring-shaped valve seats 9f, the valve portion 7 of valve element 6 rests on the above-mentioned valve seat 9f when closed.The ring-shaped valve seats 9f of annular exterior portion is around all formed spray-hole 9e on central inner part, and above-mentioned the inside partly is positioned on the radially inner side of ring-shaped valve seats 9f of exterior portion.Preferably, the exterior portion 9f that limits valve seat is thicker than the inside part that is formed with spray-hole, so the wall thickness of exterior portion is greater than the wall thickness of the inside part.
Nozzle member 9 is as the guiding segmentation, described guiding segmentation by with the flow direction of fuel from turning round along the axial flow of the plate portion 7p of valve element 6 towards the radially inner direction of the central axis of pipe fitting 3, the fuel conductance is guided among each spray-hole 9e.
Shown in Fig. 2 and 3, valve portion 7 comprises: the enlarged portion 7a of upstream, and the enlarged portion of described upstream is fixed to be engaged in the outer tube part 8; The enlarged portion 7c in downstream; And middle narrow 7b, the cross-sectional dimension that the narrow 7b of described centre has is less than each enlarged portion 7a and 7c, extend to the enlarged portion 7c in downstream in the downstream from the enlarged portion 7a of upstream, thereby upstream portion and downstream part 7a and 7c are coupled together.Fuel chambers 10 forms around middle narrow 7b in pipe chamber 3.
The enlarged portion 7a of the upstream of valve portion 7 is cup-shaped, and is included in the bottom of the downstream of the cylindrical wall opening of upstream and closed circle tubular wall.The enlarged portion 7a of upstream comprises inner chamber 7e, and described inner chamber 7e is limited by cylindrical wall and bottom, and is arranged to receive the part of helical spring 12.In the bottom of the enlarged portion 7a of upstream, be formed with a plurality of through hole 7f.These through holes 7f is connected to the inner chamber 7e fluid type of the enlarged portion 7a of upstream on the middle formed fuel chambers 10 of narrow 7b.In valve portion 7, form a blind hole 7g, so that weight reduction and improve the formability of valve element 6.Blind hole 7g extends the narrow 7b in the middle of passing, the enlarged portion 7c up to the downstream along the center line of valve element 6 from the bottom of the enlarged portion 7a of upstream.
The enlarged portion 7c in downstream comprises core and a plurality of plate portion 7p, and described plate portion 7p divides radially outward to stretch out from central division, and limits a plurality of fuel channel 7h, and described fuel channel 7h is the guide groove form, is used for fuel is guided to nozzle member 9 from fuel chambers 10.Preferably, fuel channel 7h forms with uniform (regular) angular spacing (angular interval), perhaps has predetermined spacing in the outer periphery of the enlarged portion 7c in downstream.Each fuel channel 7h forms between inside circumference (cylindrical) wall surface of adjacent two plate portion 7p and pipe fitting 3.In this embodiment, as shown in Figure 5, the core of the enlarged portion 7c in downstream comprises cylindrical wall, and 6 plate portion 7p reach each external part with the mode of radial symmetric from cylindrical wall, and each external part is suitable for sliding on the inside circumference wall surface of pipe fitting 3.Each plate portion 7p has two side surfaces, and described two side surfaces are along the straight extension of the axis of pipe fitting 3, and therefore fuel metering flows, so that make along the axial direction of pipe fitting 3 straight towards the fuel rheology of downstream.When valve element 6 was mobile vertically in pipe fitting 3, plate portion 7p slided on the inside circumferential surface of pipe fitting 3.In an illustrated embodiment, 6 plate portion 7p arrange with uniform 60 ° of angular spacings.
The bottom of the enlarged portion 7c in the downstream of valve portion 7 (that is to say, the fore-end of valve element) be formed with bulb-type recessed part 7j, described bulb-type recessed part 7j is approximate be recessed into around the central axis of valve element 6 consistent with the dome shape of the vault part 9d of nozzle member 9.The bending radius of this bulb-type recessed part 7j is less than the bending radius of vault part 9d.Be formed with the extension 7k of an annular butt joint,, and be suitable on the ring-shaped valve seats 9f that formula leans against nozzle member 9 so that as the edge of the excircle of bulb-type recessed part 7j.Under the valve closed state shown in Fig. 3 A, the extension 7k of the annular of valve element 6 butt joint closely leans against on the ring-shaped valve seats 9f.Under the valve open mode shown in Fig. 3 B, the annular of valve element 6 butt joint extension 7k and ring-shaped valve seats 7f are spaced apart.In this structure, the vault part 9d of nozzle member 9 is as receiving part, so that the fore-end of receiving valve element, thereby plays a part bulb-type recessed part 7j is led and valve element 6 is aimed at the vault central axis partly of nozzle member 9.Therefore, when valve element 6 was seated on the valve seat, valve element 6 is centering on nozzle member 9 correctly.In this embodiment, the enlarged portion 7c in downstream is formed with an annular blind hole 7m, so that weight reduction and improve formability.
This embodiment's valve element 6 is supported by sliding type in the minor diameter segmentation 3b of pipe fitting 3, at upstream end portion and the two place of downstream end portion.That is to say that outer tube part 8 sliding types of valve element 6 are engaged among the small diameter portion 3b of pipe fitting 3, and the plate portion 7p sliding type of the radial arrangement of the enlarged portion 7c in downstream is engaged among the small diameter portion 3b of pipe fitting 3 simultaneously.Like this, valve element 6 two positions that separate at the valve element in pipe fitting 3 are supported, so that valve element 6 can slide in pipe fitting 3 (small diameter portion 3b) in the axial direction.
Be arranged to energy actuating valve element 6 in the drive segment shown in Fig. 1 and 2 24, so that shift to and move apart valve seat 9f in the axial direction.This embodiment's drive segment 24 comprises helical spring 12 and the magnetic coil 15 as bias mechanism at least.
The upper end of helical spring 12 abuts against the lower end of the tubulose regulator 19 that is engaged in the core pipe 5.The lower end of helical spring 12 is placed among the inner chamber 7e of valve element 6.Helical spring 12 is arranged between core pipe 5 and the valve element 6 under compression as pressure spring like this, so that valve element 6 is pushed away core pipe 5 towards the valve closing direction, pushes valve seat 9f simultaneously to.
The step tube spare that yoke shape parts 13 are mounted on the pipe fitting 3.In this embodiment, yoke shape parts 13 brute forces are engaged on the small diameter portion 3b of pipe fitting 3, therefore are fixedly mounted on the small diameter portion 3b.Connecting core 14 is arranged between the small diameter portion 3b of yoke shape parts 13 and pipe fitting 3.In this embodiment, connecting core 14 is the magnetic components around the approximate C shape of the small diameter portion 3b of pipe fitting 3.Resin cap 11 is fixed on the end portion of yoke shape parts 13, and is arranged to be defined for the groove that receives O-ring seals 23.
Magnetic coil 15 is arranged between yoke shape parts 13 and the pipe fitting 3.Magnetic coil 15 comprises tubulose bobbin 15a and wire 15b, and above-mentioned bobbin 15a makes with resin material, be installed on the small diameter portion 3a of pipe fitting 3, and above-mentioned wire 15b twines around bobbin 15a.Magnetic coil 15 is by conductor 22 energisings of at least one pin 20 of connector 17 and formation in resin cap 16.
Resin cap 16 sealing pipe fittings 3.This embodiment's resin cap 16 forms by the state of injection moulding with the assembly parts (subassembly) of pipe fitting 3, and the assembly parts of above-mentioned pipe fitting 3 comprises yoke shape parts 13, connecting core 14 and the magnetic coil 15 that is installed on the pipe fitting 3.Connector 17 and resin cap 16 are integral parts of single resin moulded parts.
When magnetic coil 15 no electric circuits, the fuel injector of Zhi Zaoing remains in the closed state shown in Fig. 3 A usually by the thrust of helical spring 12 like this.When closed state, valve element 6 is seated on the valve seat 9f, and the annular docking part 7k of valve element 6 leans against on the ring-shaped valve seats 9f, so that each spray-hole 9e is closed on the whole.
When magnetic coil 15 energisings, the outer tube part 8 of core pipe 5, valve element and yoke shape parts 13 form closed magnetic circuit, and the magnetic circuit of described closure produces the magnetic force towards core pipe 5 in outer tube part 8.Because be provided with like this, so that magnetic force (attraction force) becomes greater than the thrust of helical spring 15, so the thrust of valve element 6 opposing helical springs 15 is by magnetic attraction, away from valve seat 9f towards core pipe 5, and make fuel injector become the valve open mode of Fig. 3 B, wherein the docking part 7k of valve element 6 and valve seat 9f are spaced apart, so that open spray-hole 9e.
Under this open mode, fuel flows into fuel channel 4 and the core pipe 5 in the pipe fitting 3 downwards, and passes the inner chamber of regulator 19 and core pipe 5, the compression member 7e and the through hole 7f inflow fuel chambers 10 of valve element 6.Fuel flows through formed gap or space between the formed fuel channel 7h of enlarged portion 7c around the downstream of valve element 6, the docking part 7k that reaches at valve element 6 and the valve seat 9f from fuel chambers 10, and sprays from spray-hole 9e.
In this fuel injector, the fuel stream Fa among each fuel channel 7h regulates by the upwardly extending plate portion 7p of axle in the axial direction, and described plate portion 7p is as the mechanism of regulated fluid stream.Then, by the guiding device of nozzle member 9 as the guiding segmentation, fuel stream is turned round sharp, so that pass the gap between docking part 7k and the valve seat 9f, the radial direction from the axial direction of fuel stream Fa to fuel stream Fb forms approximate right angle or acute angle.After this, make fuel stream change to the direction of fuel stream Fc once more sharp once more by each spray-hole 9e, so that form approximate right angle or acute angle from fuel stream Fb.By such change flow direction, fuel injector may cause that fuel separates with wall surface, and turbulization; Therefore in the fuel stream that from each through hole 9e, sprays, produce disturbance; And the result promotes and the stirring action of air and the atomizing of fuel spray.
Be used as under the situation of guiding segmentation at plate portion 7p and nozzle member 9, that builds like this can change fuel flows to valve seat 9f from plate portion 7p direction sharp according to the described fuel injector of first embodiment, therefore by fuel is separated with wall surface, promote the fuel atomizing and the turbulent flow of spraying.
In first embodiment, the two forms spray-hole 9e and valve seat 9f in nozzle member 9.Compare with the conventional structure of the different component that is formed with spray-hole with having the member that is used to limit valve seat, this structure can reduce required total number of parts; Made things convenient for assembling process; And, reduce the cost of production of fuel injector therefore by the cost of minimizing constituent elements and the cost of production process.
Compare with the conventional structure of the different component that is formed with one or more spray-holes with member with qualification valve seat, comprise the integral nozzle part 9 feasible fore-end sizes that can reduce fuel injector of valve seat 9f and one or more spray-hole 9e, so increased the degrees of freedom of the layout of mounting portion in internal-combustion engine of fuel injector.
In this embodiment, each spray-hole 9e opens in the disc end portion 9a of nozzle member 9.Therefore,, be easy to the direction that fuel metering flows to spray-hole 9e, and therefore promoted the fuel atomizing effect by regulating the shape of disc end portion 9a.
In the described nozzle member 9 according to this embodiment, the exterior portion that forms valve seat 9f inside is thicker than the wall thickness of the inside part that forms one or more spray-hole 9e inside.Therefore, the rigidity of valve seat 9f increases, and the working life of having improved fuel injector.
In this embodiment, each spray-hole 9e forms taper.Therefore, when fuel passed spray-hole 9e injection, the conical jet hole tended to make fuel to form liquid film on the periphery surface of spray-hole 9e, had therefore promoted atomizing.
In this embodiment, pipe fitting 3 is along isolated upstream end portion of the axis of pipe fitting 3 and downstream end office, sliding type supporting valve element 6.The structure that is bearing in a terminal part office with valve element sliding type is compared, and this structure has effectively prevented the inclination of valve element 6 and improved the assembly precision of valve element 6.
In this embodiment, each plate portion 7p arranges at regular intervals around the central axis of pipe fitting 3 diametrically.This layout effectively prevents the inclination of valve element 6, and has improved the precision of assembled valve element 6.
In this embodiment, under upstream end portion and the two sliding type of downstream end portion were engaged in situation in the pipe fitting 3, valve element 6 can slide in pipe fitting 3 smoothly, and has increased dynamic flow.Upstream end portion at the valve element is used respectively under the supporting structure situation of two different member supportings with downstream end portion, and the essential accuracy to shape of two members and the positional accuracy of two members of increasing is so that guarantee the smooth motion of valve element.In contrast, in according to the described supporting structure of this embodiment, as long as the precision of the shape of raising pipe fitting 3 is just enough.
Therefore compare with the nozzle member with flat on the whole end portion, the vault part 9d of the nozzle member 9 among this embodiment can improve the rigidity of nozzle member 9, and improves the load that nozzle member 9 opposings are applied from valve element 6 and the durability of fuel pressure.In addition, one or more flank 9c can further improve the rigidity and the working life of nozzle member 9.
In this embodiment, fuel injector has the structure by formed automatic aligning of the bulb-type recessed part 7j of the valve element 6 of the vault part 9d of nozzle member 9 and coupling or centering, when being seated on the valve seat 9f, valve element 6 is aimed at the central axis of valve seat 9f with convenient valve element 6.By preventing the positional deviation between valve element 6 and the nozzle member 9, this structure can guarantee the sealing between valve element 6 and the nozzle member 9, and prevents that reliably fuel from leaking when the valve closed state.
In this embodiment, valve element 6 comprises the valve portion made from resin material 7.Therefore, the whole valve lighter element made from metallic material of valve element 6 weight ratios, and advantageously reduced the sound pressure level of the noise that on valve seat, is produced by the valve member abuts.
As this embodiment's variant scheme, optionally form spiral fuel channel 7h, so that produce eddy flow.
The second embodiment of the present invention is shown in Figure 6.Fig. 6 is the sectional view according to the nozzle member 9A of the described fuel injector of second embodiment.Except nozzle member, according to the described fuel injector of second embodiment basically with identical according to the described fuel injector shown in Figure 1 of first embodiment.Therefore, same label is applied to corresponding member, and omits corresponding explanation.
Domeshape end portion 9Aa works to increase the rigidity of nozzle member 9A, and therefore plays raising nozzle member 9A and bear the load that applied by valve element 6 and the working life of fuel pressure.
Fig. 7-10 illustrates the 3rd embodiment.Fig. 7 illustrates the amplification view that comprises according to the downstream end portion of the fuel injector 13 of the described valve element of the 3rd implementation column 6B.Fig. 8 is the transverse sectional view of passing the valve element that line segment F8-F8 shown in Figure 7 got.Almost identical according to the described fuel injector of the 3rd embodiment with Fig. 1 fuel injector.Therefore, same label is applied to corresponding member, and omits corresponding explanation.The 3rd embodiment is applicable to according to the described fuel injector of first embodiment with according to the described fuel injector of second embodiment.In example shown in Figure 7, the 3rd embodiment is applicable to first embodiment.
According to the described fuel injector 113 of the 3rd embodiment, at valve element 6B in shape, different with the described valve element of the various embodiments described above 6.The valve portion 7B of valve element 6B comprises downstream end portion, and described downstream end portion comprises a cylindrical shape intermediate portion 7Bn and a plurality of plate portion 7Bp.Cylindrical shape intermediate portion 7Bn extends on the axial direction of pipe fitting 3, aim at the intermediate portion 7Bb of the valve portion 7b of valve element 6, and intermediate portion 7Bn to have diameter be the diameter that is substantially equal to intermediate portion 7Bb.Plate portion 7Bp stretches out diametrically from cylindrical shape intermediate portion 7Bn, and limits a plurality of flute profile fuel channel 7h, and each fuel channel 7h is between two adjacent plate portion 7Bp.
Plate portion 7Bp reaches each external part in the mode of radial symmetric diametrically from cylindrical shape intermediate portion 7Bn, and each stretches out the end and is suitable for sliding on inside circumference (columnar) wall surface of the small diameter portion 3b of pipe fitting 3.Each plate portion 7Bp has side surface, and described side surface extends in the axial direction towards the axial direction of pipe fitting 3.
Under plate portion 7Bp situation, can be according to the described fuel injector of the 3rd embodiment as in first embodiment, the direction that will flow from the fuel that plate portion 7Bp comes changes towards the direction of valve seat 9f largely, therefore by making fuel and wall surface separate fuel atomizing effect and turbulent flow that promotion is sprayed.
Fig. 9 and 10 is depicted as the result of experiment that implement the influence of fuel atomization the position that confirms plate portion 7Bp.Fig. 9 is the view that experiment is shown; And Figure 10 is the plotted curve that experimental result is shown.
As shown in Figure 9, experiment is with the first kind fuel injector 1B (being referred to as fuel injector 1Ba) and the second kind of fuel sparger 1B (being referred to as fuel injector 1Bb), particle diameter or the particle diameter of also measuring the fuel that sprays by burner oil carry out, above-mentioned first kind fuel injector 1B has 3 with (120 °) even spaced plate portion 7Bp, and the above-mentioned second kind of fuel sparger 1B has 6 with (60 °) even spaced plate portion 7Bp, simultaneously will be on the axial direction of pipe fitting 3 be set at apart from the distance L of the front end of valve element 6B to equal 1.1mm, 1.6mm, 2.1mm and 3.1mm.Equally, with the fuel injector 100 that does not have plate portion 7Bp example in contrast, by burner oil and measure particle size and experimentize.
As shown in figure 10, along with the increase from the front end of valve element 6B to the axial distance L of plate portion 7Bp, the particle diameter of fuel reduces.In Figure 10, curve 1Ba illustrates the characteristic of fuel injector 1Ba; Curve 1Bb illustrates the characteristic of fuel injector 1Bb; And curve 100 illustrates the characteristic of reference examples fuel injector 100.
The fourth embodiment of the present invention shown in Figure 11.Figure 11 is the amplification view that illustrates according to the downstream end portion of the described fuel injector of the 4th embodiment.According to the described fuel injector of the 4th embodiment almost with identical according to the described fuel injector of the various embodiments described above.Therefore, identical label is applied to corresponding components, and omits explanation separately.The 4th embodiment is applicable to the fuel injector of any the foregoing description.In the embodiment shown in fig. 11, the 4th embodiment is applicable to the 3rd embodiment.
Except nozzle member 9C, comprise valve base piece 41C according to the described fuel injector of the 4th embodiment; And it is different with the front end of the 3rd embodiment's valve element that the front end of valve element 6C is configured as shape.The 4th embodiment's nozzle member 9C does not comprise valve seat.
Nozzle member 9C is arranged on the downstream surface of valve base piece 41C, so that the downstream of closed tapered opening.This embodiment's nozzle member 9C gets the flat sheet shape.Nozzle member 9C is fixed on the pipe fitting 3.In the neutral zone of nozzle member 9C, form a plurality of spray-hole 9e, so that lead in the tapered opening.In this embodiment, valve base piece 41C and nozzle member 9C constitute guiding segmentation 30C.
The valve portion 7C of this embodiment's valve element 6 has flat downstream surface, and its periphery is suitable for leaning against on the valve seat 41Ca.Under flat downstream situation, simplified the structure of this embodiment's valve element 6C.
Figure 12 illustrates the fifth embodiment of the present invention.Figure 12 is the amplification view that illustrates according to the described fuel injector downstream end portion of the 5th embodiment.The 5th embodiment's the fuel injector almost fuel injector with the various embodiments described above is identical.Therefore, same label is applied to corresponding components, and omits explanation separately.The 5th embodiment is applicable to the fuel injector of any the foregoing description.In the embodiment shown in fig. 12, the 5th embodiment is applicable to the 4th embodiment.
In the 5th embodiment, valve element 6D comprises the spheroid or the ball 7Dq of the lower end that is arranged on valve portion 7D, and unlike the 4th embodiment's valve element.Plate portion 7Bp is positioned on the upstream side of spheroid 7Dq.
Under the valve closed state, spheroid 7Dq is seated on the valve seat 41Ca.Preferably, the diameter of spheroid 7Dq is substantially equal to or less than the diameter of the middle circle tubular part 7Bh of valve portion 7D.Gou Zao spheroid 7Dq effectively prevents fuel stream turbulent flow (turbulence) after the formed passage in passing plate portion 7Bp like this.
After passing the fuel channel that is limited by plate portion 7Bp, fuel flows at the place, side of spheroid 7Dq along the axial direction of pipe fitting 3.Therefore, flow direction can be changed to the direction towards valve seat 9f around spheroid 7Dq from axial direction, and therefore promote the fuel atomization effect by promoting fuel and wall surface to separate with turbulent flow according to the described fuel injector of the 5th embodiment.
The various changes and the modification of illustrated embodiment are feasible.
Nozzle member 9 (or 9A) can be made with resin material.
The application is based on the 2006-219631 of Japanese patent application formerly of No.2005-315172 of Japanese patent application formerly that was submitted on October 28th, 2005 and submission on August 11st, 2006.The whole contents of these two Japanese patent application No.2005-315172 and No.2006-219631 all is included in herein by reference.
Although by the present invention being described, the invention is not restricted to the foregoing description above with reference to some embodiment of the present invention.Concerning those skilled in the art, after having seen above-mentioned explanation, can make amendment and change the foregoing description.Scope of the present invention limits with reference to following claims.
Claims (18)
1. fuel injector comprises:
Pipe fitting, described pipe fitting comprise and are used for the interior thorax that fuel passes through;
Valve seat, described valve seat are arranged in the downstream end portion of pipe fitting;
Valve element, the described valve planning valve seat that becomes in pipe fitting, to slide to vertically and to slip away;
A plurality of plate portions, described a plurality of plate portions are arranged in the valve element, and are arranged to and can slide on the inner peripheral surface of pipe fitting, and plate portion extends radially with respect to the axis of pipe fitting, and each plate portion all comprises the side surface that extends along the axis of pipe fitting;
Drive segment, described drive segment are used for valve seat is shifted to and moved apart to the valve element;
Nozzle member, described nozzle member comprises spray-hole, described spray-hole is positioned at the inboard of pipe fitting valve seat, and is arranged to spray the fuel that is allowed to by formed gap between valve element and the valve seat; With
Targeting part, described targeting part can make the fuel stream that is allowed to along plate portion flows turn round towards the axis of pipe fitting, therefore fuel are directed into spray-hole.
2. fuel injector as claimed in claim 1, wherein, nozzle member is to be formed with the two member of integral body of spray-hole and valve seat.
3. fuel injector as claimed in claim 2, wherein, nozzle member comprises the inside part and exterior portion, above-mentioned the inside partly is formed with spray-hole, and above-mentioned exterior portion is formed with valve seat, and thicker than the thickness of the inside part that is formed with spray-hole.
4. as one of them described fuel injector of claim 1-3, wherein, spray-hole is made taper.
5. as one of them described fuel injector of claim 1-3, wherein, the valve element comprises an end portion, and described end portion is configured as consistent with the shape of nozzle member.
6. as one of them described fuel injector of claim 1-3, wherein, the valve planning becomes can work as valve element centering when being seated on the valve seat.
7. as one of them described fuel injector of claim 1-3, wherein, nozzle member comprises the vault part, and described vault part is swelled towards the valve element; The two all is formed on valve seat and spray-hole in the vault part.
8. as one of them described fuel injector of claim 1-3, wherein, valve element two end position places in pipe fitting are subjected to the sliding type supporting.
9. fuel injector comprises:
Pipe fitting, described pipe fitting comprises interior thorax, so that accept fuel;
The valve element, described valve planning becomes can slide between valve operating position and valve open position vertically in pipe fitting, and the valve element comprises:
Core; With
A plurality of plate portions, described plate portion divide from central division and extend radially, and sliding type is engaged in the pipe fitting; With
The guiding segmentation, described guiding segmentation comprises:
Exterior portion, described exterior portion limit valve seat and
The inside part, described the inside partly is positioned on the radially inner side of exterior portion, and is formed with spray-hole, so that spray the fuel of carrying by the gap of between valve seat and valve element, opening wide,
Described guiding segmentation is arranged to will redirect to along the fuel stream that plate portion is carried the radially inward direction towards spray-hole.
10. fuel injector as claimed in claim 9, wherein, fuel injector also comprises drive segment, so that movement of valve element between valve operating position and valve open position in the axial direction; And the plate portion of valve element is arranged to pass through towards the guiding segmentation guiding in the downstream side that is positioned at the valve element vertically the fuel of the thorax conveying of pipe fitting.
11. fuel injector as claimed in claim 9, wherein, the guiding segmentation comprises nozzle member, and described nozzle member comprises exterior portion and the inside part, and described exterior portion and the inside partly are the integral parts of nozzle member.
12. fuel injector as claimed in claim 9, wherein, the plate portion of valve element limits a plurality of guide grooves, and described guide groove extends in the axial direction, so that in the axial direction the guiding segmentation guiding of fuel towards the downstream side that is positioned at the valve element; The exterior portion of guiding segmentation is the annulus around the inside part that is formed with spray-hole.
13. as one of them described fuel injector of claim 9-12, wherein, the guiding segmentation also comprises targeting part, so that flow direction is turned round towards the radially inward direction of the inside part that is formed with spray-hole from the axial direction along plate portion.
14. as one of them described fuel injector of claim 9-12, wherein, the valve element comprises fore-end; The guiding segmentation comprises receiving part, and the shape of described receiving part is processed into the fore-end of energy receiving valve element, and makes valve element centering when the valve element is seated on the valve seat.
15. fuel injector as claimed in claim 14, wherein, the receiving part of the fore-end of valve element and guiding segmentation in the two comprises recessed portion; The receiving part of the fore-end of valve element and guiding segmentation another in the two comprises extension, and the shape of described extension is processed into and can enters recessed portion, and when the valve element is seated on the valve seat, the valve element is centered in the valve seat.
16. as one of them described fuel injector of claim 9-12, wherein, nozzle member comprises tubular portion and end portion, above-mentioned tubular portion is engaged in the pipe fitting, and an end of the closed tubular portion of above-mentioned end part, and be formed with valve seat and spray-hole.
17. as one of them described fuel injector of claim 9-12, wherein, the guiding segmentation comprises valve base piece and nozzle member, above-mentioned valve base piece is formed with valve seat, and said nozzle spare is formed with spray-hole.
18. as one of them described fuel injector of claim 9-12, wherein, the valve element comprises:
Downstream part, described downstream part comprise plate portion and the core by the supporting of pipe fitting sliding type;
Intermediate portion, described intermediate portion limit a fuel chambers around this intermediate portion in pipe fitting on the upstream side of downstream part; With
Upstream portion, described upstream portion is connected with the downstream part by intermediate portion, and is formed with through hole by pipe fitting sliding type supporting, flows in the fuel chambers so that make fuel in the inner chamber of pipe fitting can pass upstream portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005315172 | 2005-10-28 | ||
| JP2005315172 | 2005-10-28 | ||
| JP2006219631 | 2006-08-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1955456A true CN1955456A (en) | 2007-05-02 |
Family
ID=38062961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610142840 Pending CN1955456A (en) | 2005-10-28 | 2006-10-27 | Fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1955456A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030135A (en) * | 2018-01-11 | 2019-07-19 | 罗伯特·博世有限公司 | For the valve of dosage fluid, especially fuel injection valve |
-
2006
- 2006-10-27 CN CN 200610142840 patent/CN1955456A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030135A (en) * | 2018-01-11 | 2019-07-19 | 罗伯特·博世有限公司 | For the valve of dosage fluid, especially fuel injection valve |
| CN110030135B (en) * | 2018-01-11 | 2022-05-13 | 罗伯特·博世有限公司 | Valve for metering fluid, in particular fuel injection valve |
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Open date: 20070502 |