CN1818370A - Composite microdisplacement oil jetter of IC engine with piezoelectric control - Google Patents
Composite microdisplacement oil jetter of IC engine with piezoelectric control Download PDFInfo
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- CN1818370A CN1818370A CN 200610045793 CN200610045793A CN1818370A CN 1818370 A CN1818370 A CN 1818370A CN 200610045793 CN200610045793 CN 200610045793 CN 200610045793 A CN200610045793 A CN 200610045793A CN 1818370 A CN1818370 A CN 1818370A
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Abstract
The piezoelectric-controlled micro-displacement combined fuel injector for internal combustion engines belongs to a fuel-injector apparatus for the fuel system of internal combustion engines. Because of being controlled by a piezoelectric element, its fuel-injection correct time is easy to regulate. An internal tapered angle 2 alpha being offset from beta angle is disposed at the outlet of a fuel nozzle. An oil-guide slot is opened on an umbrella-injection internal tapered surface in order to control the appointed area where the oil beam can reach the combustion chamber easily.
Description
Technical field
The present invention relates to a kind of internal-combustion engine composite microdisplacement oil of piezoelectricity control, it belongs to the fueling injection equipment of fuel of internal combustion engine system.
Background technique
At present, the oil sprayer of internal-combustion engine common rail fuel combustion system oil spout in the firing chamber adopts solenoid valve to come the back pressure of control action on injector valve mostly.When the back pressure on acting on needle-valve is high, not oil spout of oil nozzle; When the back pressure on acting on needle-valve was hanged down, high pressure oil made on the needle-valve and moves, and oil nozzle is with regard to oil spout.In recent years, utilize the piezoelectric material energising time can expand or contraction deformation, allowing the switching of displacement drive three-way valve that distortion produces or two way valve come the back pressure of control action on injector valve has been common method.The fuel injection device structure of the disclosed use piezo actuator of U. S. Patent (US6874475B2), the displacement that has produced when having introduced the energising of a kind of use big piston simple in structure and small piston hydraulic pressure amplification piezoelectric final controlling element, control a three-way valve, the back pressure that acts on the injector valve is directly being controlled in the switching of this three-way valve.Because the oil spout frequency of oil nozzle is very high, big piston and small piston frequent operation very easily wear and tear, wearing and tearing back injection timing takes place to be difficult to guarantee, even clear-cut just not oil spout, and be difficult to after wearing and tearing repair, can cause bigger waste.
Injector nozzle matching parts in oil sprayer directly can influence every performance index of internal-combustion engine.General diesel engine often adopts perforated plate type atomizer, and G. D. I engine often adopts vortex injector.Now G. D. I engine is generally organized the weak mixture stratified mixture combustion in order further to improve performance, promptly manages a part of fuel oil is directed to around the spark plug, and the overrich district that formation is easy to light is so that further improve compression ratio.Umbrella-shaped spray for forming by eddy current is difficult to form the overrich district.For the porous spraying,, be difficult to form homogeneous charge if no suitable air-flow cooperates.In view of the foregoing, develop a kind of oil sprayer that not only had been applicable to diesel engine but also had been suitable for G. D. I engine, when forming homogeneous charge, can form the HYDROCARBON-BEARING REGION that is easy to burn again, and the oil sprayer with good process and reliability have important environmental protection and energy-saving significance undoubtedly.
Summary of the invention
In order to overcome the shortcoming that prior art exists, develop a kind of oil sprayer that not only had been applicable to diesel engine but also had been suitable for G. D. I engine, when forming homogeneous charge, can form the HYDROCARBON-BEARING REGION that is easy to burn again, the invention provides a kind of internal-combustion engine composite microdisplacement oil of piezoelectricity control, this oil sprayer should be the oil mass of a corresponding load of work cycle of motor with the vaporific firing chamber that sprays into, in the firing chamber, form the inflammable mixture of homogeneous, and can satisfy the different requirements of diesel engine or G. D. I engine tissue burning, thereby the compression ratio of internal-combustion engine can be increased substantially, reach the raising Economy, reduce the purpose of discharging.
The technical solution adopted for the present invention to solve the technical problems is: a kind of internal-combustion engine composite microdisplacement oil of piezoelectricity control, it is provided with an injector nozzle matching parts, a piezoelectric pile and a control mechanism that is driven by piezoelectric pile in oil injector body.Above-mentioned oil injector body is divided into the upper body, middle body and lower body, and be integral by being threaded, above-mentioned control mechanism comprises a piston that has piston rod, an one-way valve and a plunger are paid, in the upper body, be provided with belleville spring, the piston that has piston rod, piezoelectric pile and lead 1 that is connected electrical socket and lead 2, in middle body, be provided with an one-way valve, the oil input channel of high pressure and little oil duct, the back oil road 1 of low pressure and back oil road 2, being provided with a plunger of being made up of plunger and plunger bushing in lower body successively pays, spring and spring seat, pad and the injector nozzle matching parts of forming by needle-valve and needle-valve body, in plunger bushing, be provided with the oil input channel of high pressure and the back oil road of low pressure, in needle-valve body, be provided with the oil input channel of high pressure, between middle body and plunger bushing, guarantee that by locating stud separately high pressure oil input channel and low pressure back oil road are interconnected, at plunger bushing, guarantee that by locating stud high pressure oil input channel separately is interconnected between pad and the needle-valve body, be provided with a nozzle opening under the needle-valve body of above-mentioned injector nozzle matching parts, the head of this nozzle opening and needle-valve forms a variable cross section ring-type nozzle opening, be provided with interior cone angle 2 α in the exit position of nozzle opening, the outside, lower end at needle-valve body is provided with an outside cone angle δ, end at needle-valve also is provided with the conical surface, the lift of needle-valve is 50～300 μ m, and the external cylindrical surface diameter of needle valve end is 0.8～4.0mm.
Above-mentioned one-way valve adopts mitre velve, is provided with Returnning spring in the bottom of mitre velve, and the displacement that the piezoelectric pile of energising produces directly drives mitre velve by piston and piston rod and opens.Above-mentioned one-way valve also can adopt spherical valve, is provided with Returnning spring in the bottom of spherical valve, and the displacement that the piezoelectric pile of energising produces directly drives spherical opening of valves by piston and piston rod.
Above-mentioned interior cone angle 2 α are 30～155 degree, and the angular bisector of interior cone angle 2 α is consistent with the center line of needle-valve, or becomes angle β with the center line of needle-valve, and angle β is 0～30 degree, and above-mentioned outside cone angle δ is 20～120 degree.At least be provided with 1 guiding oil groove on the conical surface of above-mentioned interior cone angle 2 α.Guiding oil groove on the conical surface of above-mentioned interior cone angle 2 α can be semicircle, the curve bath that 1～24 diameter is 50～300 μ m, or maximum open is triangle, the dovetail groove of 50～300 μ m.
Underpart at needle-valve body circumferentially is provided with a nozzle opening at least.The hole count of nozzle opening can be 1～24, and the aperture is 50～300 μ m, and the center line angle γ in hole is 30～155 degree.The angle of nozzle opening center line and needle-valve center line can be symmetric arrangement or asymmetric arrangement with the needle-valve center line.
The guiding theory of technique scheme is: the internal-combustion engine composite microdisplacement oil of this piezoelectricity control, when the piezoelectric pile no electric circuit, one-way valve is closed under the effect of Returnning spring, and high pressure oil enters pressure chamber, and plunger forces needle-valve to be taken a seat under the pressure oil effect.When piezoelectric pile was switched on, piezoelectric pile expanded, and force following piston and piston rod to move down and back down one-way valve, the pressure chamber draining, the pressure oil that acts on the plunger disappears, and needle-valve takeoffs under the effect of high pressure oil, the oil nozzle commencement of fuel injection.The following several schemes of the general employing of above-mentioned injector nozzle matching parts: one, adopt the pure umbrella spray of just putting.Two, adopting the umbrella spray of biasing, allow the angular bisector of interior cone angle 2 α of spray orifice outlet become the β angle with the center line of needle-valve, is to want a part of fuel oil is guided into the appointed area, firing chamber.Three, the conical surface of interior cone angle 2 α is provided with the guiding oil groove, so that fuel oil is directed to the appointed area, the formation and the tissue burning that utilize mixed gas is arranged.Four, adopt umbrella spray and porous to combine, more help organizing the homogeneous in interior local overrich of cylinder and the whole firing chamber to mix.This composite microdisplacement oil can also be used for except that diesel oil and gasoline as methyl alcohol, ethanol, liquefied petroleum gas (LPG), rock gas and other substitute fuels.
The invention has the beneficial effects as follows: the internal-combustion engine composite microdisplacement oil of this piezoelectricity control is owing to adopt piezoelectric element control injection timing, and injection timing is easy to adjust, the control accuracy height.Be provided with interior cone angle 2 α at a biasing β angle in the exit position of nozzle opening, and on umbrella spray inner conical surface, convince by patient analysis to oil groove, or adopt umbrella spray and porous to combine, be easy to control the appointed area that the oil bundle arrives the firing chamber, satisfy the different requirements of diesel engine or G. D. I engine tissue burning, therefore can improve the compression ratio of internal-combustion engine, improve the thermal efficiency of motor mixed gas, general fuel consumption rate will descend 10～20%, and HC and NOx discharging also have reduction significantly.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a kind of structural drawing of internal-combustion engine composite microdisplacement oil of piezoelectricity control.
Fig. 2 is the partial enlarged drawing that adopts cone shaped one-way valve.
Fig. 3 is the partial enlarged drawing that adopts ball valve.
Fig. 4 is the interior cone angle symmetric arrangement head enlarged view that umbrella sprays even part ring-type nozzle opening.
Fig. 5 is the interior cone angle asymmetric arrangement head enlarged view that umbrella sprays even part ring-type nozzle opening.
Fig. 6 is that the umbrella with guiding oil groove sprays even part head enlarged view.
Fig. 7 is that A among Fig. 6 is to view.
Fig. 8 is the even part porous symmetric arrangement head enlarged view that umbrella spray and porous combine.
Fig. 9 is the even part porous asymmetric arrangement head enlarged view that umbrella spray and porous combine.
Among the figure: 1, needle-valve body, 1a, variable cross section ring-type nozzle opening, 1b, nozzle opening, 1c, the guiding oil groove, 1d, oil-feed is logical, and 2, needle-valve, 2a, the conical surface, 3, pad, 4, spring seat, 5, spring, 5a, the low pressure oil pocket, 6, plunger, 7, plunger bushing, 7a, oil input channel, 7b, back oil road, 8, spring, 8a, high-voltage oil cavity, 9, middle body, 9a, little oil duct, 9b, oil input channel, 9c, back oil road 1,9d, back oil road 2,10, mitre velve, 11, back leakage connection, 12, belleville spring, 13, piston, 13a, piston rod, 14, sealing gasket, 15, piezoelectric pile, 16, the upper body, 17, lead 1,17a, lead 2,18, clamping sleeve, 19, electrical socket, 20,21, locating stud, 22, lower body, 23, valve seat, 23a, following oilhole, 23b, the side oilhole, 24, spherical valve, 25, spring, 25a, hyperbaric chamber, A, filler opening, B, return opening.
Embodiment
In the embodiment shown in Fig. 1,2, injector body is integral by being threaded by upper body 16, middle body 9 and lower body 22, belleville spring 12 is housed in upper body 16 successively, has piston 13 and the piezoelectric pile 15 of piston rod 13a, piezoelectric pile 15 is electrically connected with electrical socket 19 by lead 117 and lead 217a, and by clamping sleeve 18 parts such as piezoelectric pile 15 is fastened in the upper body 16.Upper body 16 should install sealing gasket 14 additional on the body 9 time in being installed to, during piston rod 13a should insert movably in the respective aperture of body 9.
On middle body 9, be provided with high pressure oil import A, high pressure oil input channel 9b, the little oil duct 9a of high pressure and high-voltage oil cavity 8a, also be provided with back oil road 19c, back oil road 29d, back leakage connection 11 and return opening B, also be provided with the one-way valve of being made up of mitre velve 10 and Returnning spring 8 in high-voltage oil cavity 8a, little oil duct 9a is communicated with oil input channel 9b and high-voltage oil cavity 8a.
Injector nozzle matching parts, pad 3 and the plunger be made up of needle-valve body 1 and needle-valve 2 are housed in lower body 22 successively to be paid, plunger is paid by plunger 6 and plunger bushing 7 and is formed, in plunger bushing 7, be provided with high pressure oil input channel 7a, back oil road 7b and low pressure oil pocket 5a, back oil road 7b is communicated with low pressure oil pocket 5a, is provided with spring seat 4 and spring 5 in low pressure oil pocket 5a.In needle-valve body 1, be provided with high pressure oil input channel 1d.For above-mentioned oil input channel and back oil road can correctly be located, between middle body 9 and plunger bushing 7, be provided with locating stud 20, between plunger bushing 7, pad 3 and needle-valve body 1, be provided with locating stud 21.
The another kind of structure of one-way valve in the body 9 during Fig. 3 shows and is located at, this one-way valve is made up of valve seat 23, spherical valve 24 and spring 25, be provided with the following oilhole 23a that high-voltage oil cavity 25a is communicated with plunger cavity under valve seat 23, the side is provided with the side oilhole 23b that high-voltage oil cavity 25a is communicated with little oil duct 9a.
As the internal-combustion engine composite microdisplacement oil of the control of the piezoelectricity shown in Fig. 1,2,3, its working procedure is as follows: when piezoelectric pile 15 no electric circuits, oil sprayer can oil spout.At this moment closed check valve, the oil pressure in the high-voltage oil cavity equates that with oil pressure in the oil input channel plunger 6 forces needle-valve 2 to be taken a seat under the effect of high pressure oil.When piezoelectric pile 15 energisings, piezoelectric pile 15 expands distortion, and can only overcome belleville spring and try hard to recommend moving piston 13 and piston rod 13a and produce displacement and back down one-way valve, make the pressure oil in the high-voltage oil cavity leak into back oil road 29d, because the circulation area of little oil duct 9a is little, the oil pressure that acts on the plunger 6 sharply reduces, and makes needle-valve 2 overcome the pressure of spring 5 under the effect of high pressure oil and takeoffs, and carries out oil spout.In case piezoelectric pile 15 outages, belleville spring 12 resets, move on piston 13 and the piston rod 13a, and closed check valve, high-voltage oil cavity pressure rises, and forces plunger 6 to promote needle-valve 2 and takes a seat, and oil spout stops.In order to guarantee above-mentioned oil sprayer energy reliably working, be provided with a low pressure oil pocket 5a, so that the leakage of oil between needle-valve body 1 and the needle-valve 2 is released by back oil road 7b.
Shown in Fig. 4,5, be provided with a nozzle opening in the underpart of needle-valve body 1, it is 90 degree that the exit position of nozzle opening is provided with interior cone angle 2 α, and the top of interior cone angle is an inner cylindrical surface, and being provided with an outside cone angle δ in the outside, lower end of needle-valve body 1 is 100 degree.The head of needle-valve 2 is provided with an external cylindrical surface, has the gap between external cylindrical surface and the inner cylindrical surface.The nozzle opening of the end of needle-valve 2 and needle-valve body 1 underpart forms a variable cross section ring-type nozzle opening 1a.End at needle-valve 2 also is provided with conical surface 2a, and the maximum lift of needle-valve 2 is 150 μ m, and the diameter of needle-valve 2 external cylindrical surfaces is 2.0mm.Fig. 4 is that the interior cone angle of nozzle opening of umbrella spray micrometric displacement oil nozzle is a symmetric arrangement, and promptly the angular bisector of interior cone angle 2 α is consistent with the center line of needle-valve 2, so variable cross section ring-type nozzle opening 1a is prismatic circumferentially.Fig. 5 is that the interior cone angle of nozzle opening of umbrella spray micrometric displacement oil nozzle is an asymmetric arrangement, the center line of the angular bisector of cone angle 2 α and needle-valve 2 β that has angle promptly, therefore variable cross section ring-type nozzle opening 1a circumferentially is a non-constant section, this helps guiding the appointed area of more oil to the firing chamber, so that organize diesel engine or the different burnings that require of G. D. I engine.
Shown in Fig. 6,7, in needle-valve body 1, be provided with 8 guiding oil groove 1c on the conical surface of cone angle 2 α.The guiding oil groove 1c that is distributed on the conical surface is that diameter is the semi-circular groove of 150 μ m.
Shown in Fig. 8,9, one pair of even part that the spray of this umbrella and porous assembled micrometric displacement oil nozzle are made up of needle-valve 2 and needle-valve body 1 is to be circumferentially with nozzle opening 1b at needle-valve body 1 cone seal pars infrasegmentalis with the main distinction shown in Fig. 4,5.The center line of nozzle opening 1b and needle-valve 2 is symmetric arrangement, and the hole count of nozzle opening 1b is 6, and the aperture is 150 μ m, and the center line angle γ in hole is 100 degree.The center line of nozzle opening 1b shown in Figure 8 and needle-valve 2 is symmetric arrangement.The center line of nozzle opening 1b shown in Figure 9 and needle-valve 2 is asymmetric arrangement, its objective is for guiding the appointed area of more oil to the firing chamber, so that organize diesel engine or the different burnings that require of G. D. I engine.
Claims (9)
1, a kind of internal-combustion engine composite microdisplacement oil of piezoelectricity control, it is provided with an injector nozzle matching parts in oil injector body, a piezoelectric pile (15) and a control mechanism that drives by piezoelectric pile (15), it is characterized in that: above-mentioned oil injector body is divided into upper body (16), middle body (9) and lower body (22), and be integral by being threaded, above-mentioned control mechanism comprises a piston (13) that has piston rod (13a), an one-way valve and a plunger are paid, in upper body (16), be provided with belleville spring (12), the piston (13) that has piston rod (13a), piezoelectric pile (15) and lead 1 (17) that is connected electrical socket (19) and lead 2 (17a), in middle body (9), be provided with an one-way valve, oil input channel of high pressure (9b) and little oil duct (9a), the back oil road 1 (9c) of low pressure and back oil road 2 (9d), being provided with a plunger of being made up of plunger (6) and plunger bushing (7) in lower body (22) successively pays, spring (5) and spring seat (4), pad (3) and the injector nozzle matching parts of forming by needle-valve (2) and needle-valve body (1), in plunger bushing (7), be provided with the oil input channel (7a) of high pressure and the back oil road (7b) of low pressure, in needle-valve body (1), be provided with the oil input channel (1d) of high pressure, between middle body (9) and plunger bushing (7), guarantee that by locating stud (20) separately high pressure oil input channel and low pressure back oil road are interconnected, in plunger bushing (7), guarantee that by locating stud (21) high pressure oil input channel separately is interconnected between pad (3) and the needle-valve body (1), be provided with a nozzle opening under the needle-valve body of above-mentioned injector nozzle matching parts (1), the head of this nozzle opening and needle-valve (2) forms a variable cross section ring-type nozzle opening (1a), be provided with an interior cone angle (2 α) in the exit position of nozzle opening, the outside, lower end at needle-valve body (1) is provided with an outside cone angle (δ), also be provided with the conical surface (2a) in the end of needle-valve (2), the lift of needle-valve (2) is 50～300 μ m, and the external cylindrical surface diameter of needle-valve (2) end is 0.8～4.0mm.
2, the internal-combustion engine composite microdisplacement oil of controlling according to the described piezoelectricity of claim 1, it is characterized in that: above-mentioned one-way valve adopts mitre velve (10), be provided with Returnning spring (8) in the bottom of mitre velve (10), the displacement that the piezoelectric pile of energising (15) produces directly drives mitre velve (10) by piston (13) and piston rod (13a) and opens.
3, the internal-combustion engine composite microdisplacement oil of controlling according to the described piezoelectricity of claim 1, it is characterized in that: above-mentioned one-way valve adopts spherical valve (24), be provided with Returnning spring (25) in the bottom of spherical valve (24), the displacement that the piezoelectric pile of energising (15) produces directly drives spherical valve (24) by piston (13) and piston rod (13a) and opens.
4, according to the internal-combustion engine composite microdisplacement oil of claim 2 or the control of 3 described piezoelectricity, it is characterized in that: above-mentioned interior cone angle (2 α) is 30～155 degree, the angular bisector of interior cone angle (2 α) is consistent with the center line of needle-valve (2), or become angle (β) with the center line of needle-valve (2), angle (β) is 0～30 degree, and above-mentioned outside cone angle (δ) is 20～120 degree.
5, according to the internal-combustion engine composite microdisplacement oil of the described piezoelectricity control of claim 4, it is characterized in that: be provided with 1 guiding oil groove (1c) at least on the conical surface of above-mentioned interior cone angle (2 α).
6, the internal-combustion engine composite microdisplacement oil of controlling according to the described piezoelectricity of claim 5, it is characterized in that: the guiding oil groove (1c) on the conical surface of above-mentioned interior cone angle (2 α) is semicircle, the curve bath that 1～24 diameter is 50～300 μ m, or maximum open is triangle, the dovetail groove of 50～300 μ m.
7, according to the internal-combustion engine composite microdisplacement oil of the described piezoelectricity control of claim 4, it is characterized in that: the underpart at needle-valve body (1) circumferentially is provided with a nozzle opening (1b) at least.
8, according to the internal-combustion engine composite microdisplacement oil of the described piezoelectricity control of claim 7, it is characterized in that: the hole count of nozzle opening (1b) is 1～24, and the aperture is 50～300 μ m, and the center line angle (γ) in hole is 30～155 degree.
9, according to the internal-combustion engine composite microdisplacement oil of the described piezoelectricity control of claim 8, it is characterized in that: the angle of nozzle opening (1b) center line and needle-valve (2) center line can be symmetric arrangement or asymmetric arrangement with needle-valve (2) center line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200610045793 CN1818370A (en) | 2006-01-26 | 2006-01-26 | Composite microdisplacement oil jetter of IC engine with piezoelectric control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610045793 CN1818370A (en) | 2006-01-26 | 2006-01-26 | Composite microdisplacement oil jetter of IC engine with piezoelectric control |
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| CN1818370A true CN1818370A (en) | 2006-08-16 |
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| CN 200610045793 Pending CN1818370A (en) | 2006-01-26 | 2006-01-26 | Composite microdisplacement oil jetter of IC engine with piezoelectric control |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678414A (en) * | 2012-05-02 | 2012-09-19 | 欧阳光耀 | Piezoelectric injector for diesel engine |
| CN103189635A (en) * | 2010-11-04 | 2013-07-03 | 罗伯特·博世有限公司 | Fuel injector |
| CN107131075A (en) * | 2017-06-28 | 2017-09-05 | 哈尔滨工程大学 | Fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat |
| CN107165748A (en) * | 2017-06-28 | 2017-09-15 | 哈尔滨工程大学 | Fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type mixed admission |
| JP2018123728A (en) * | 2017-01-31 | 2018-08-09 | 株式会社デンソー | Fuel injection valve |
| CN111894776A (en) * | 2020-07-06 | 2020-11-06 | 一汽解放汽车有限公司 | Fuel injector |
-
2006
- 2006-01-26 CN CN 200610045793 patent/CN1818370A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103189635A (en) * | 2010-11-04 | 2013-07-03 | 罗伯特·博世有限公司 | Fuel injector |
| CN103189635B (en) * | 2010-11-04 | 2016-08-31 | 罗伯特·博世有限公司 | Fuel injector |
| CN102678414A (en) * | 2012-05-02 | 2012-09-19 | 欧阳光耀 | Piezoelectric injector for diesel engine |
| JP2018123728A (en) * | 2017-01-31 | 2018-08-09 | 株式会社デンソー | Fuel injection valve |
| CN107131075A (en) * | 2017-06-28 | 2017-09-05 | 哈尔滨工程大学 | Fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat |
| CN107165748A (en) * | 2017-06-28 | 2017-09-15 | 哈尔滨工程大学 | Fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type mixed admission |
| CN111894776A (en) * | 2020-07-06 | 2020-11-06 | 一汽解放汽车有限公司 | Fuel injector |
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