WO2006060942A1 - Module integre d’alimentation en carburant - Google Patents

Module integre d’alimentation en carburant Download PDF

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Publication number
WO2006060942A1
WO2006060942A1 PCT/CN2005/000970 CN2005000970W WO2006060942A1 WO 2006060942 A1 WO2006060942 A1 WO 2006060942A1 CN 2005000970 W CN2005000970 W CN 2005000970W WO 2006060942 A1 WO2006060942 A1 WO 2006060942A1
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WO
WIPO (PCT)
Prior art keywords
oil
fuel
passage
armature
supply unit
Prior art date
Application number
PCT/CN2005/000970
Other languages
English (en)
French (fr)
Inventor
Daguang Xi
Yanxiang Yang
Changwen Liu
Original Assignee
Fai Electronic Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fai Electronic Co., Ltd. filed Critical Fai Electronic Co., Ltd.
Priority to EP05759433A priority Critical patent/EP1832739B1/en
Priority to JP2007544714A priority patent/JP4562778B2/ja
Priority to US11/660,408 priority patent/US7377266B2/en
Priority to AT05759433T priority patent/ATE502204T1/de
Priority to DE602005026989T priority patent/DE602005026989D1/de
Publication of WO2006060942A1 publication Critical patent/WO2006060942A1/zh

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/042Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04Pumps peculiar thereto
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00Fuel-injectors combined or associated with other devices
    • F02M57/02Injectors structurally combined with fuel-injection pumps
    • F02M57/022Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/027Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047Layout or arrangement of systems for feeding fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0076Details of the fuel feeding system related to the fuel tank
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock

Definitions

  • the invention belongs to the technical field of engines, and particularly relates to an electronic fuel injection device, and more particularly to an electronic fuel injection system applied to a small engine.
  • the existing BOSCH electronic fuel injection system provides fuel from a rotary electromagnetic pump embedded in the fuel tank.
  • the fuel passes through the high pressure oil passage and is regulated to reach the nozzle.
  • the electronic control unit (ECU) controls the nozzle to inject the fuel quantitatively into the nozzle. Gas manifold.
  • Chinese invention patent CN1133810C Electrical fuel injection device
  • Electrical fuel injection device provides a new type of pulsed electromagnetically driven fuel injection device consisting of a fuel inlet device, a fuel drive device and a fuel injection device, through the working coil and return position of the fuel drive device
  • the coil forms a magnetic circuit to drive a follower comprising an armature and a plunger to effect a reciprocating cycle of the oil absorbing injection.
  • the integrated fuel supply unit provided by the invention can directly obtain fuel from the fuel tank through a low pressure oil pipe.
  • the integrated fuel supply unit may encounter the following problems in application: the installation attitude is strictly limited, the engine is left for a long time, the hot car state is started, the long idle speed and the high temperature and heavy load are running, and the fuel passage inside and outside the oil supply unit The fuel vapor produced can seriously interfere with normal oil supply. To this end, a more sophisticated structural solution is needed to effectively suppress the generation of fuel vapor and quickly eliminate the steam that has already been generated.
  • Patent application CN1474910A "Electronically controlled fuel injection device” particularly emphasizes the above problems that may occur, so that it provides a bypass “return line” between the coil and the cylinder from the inlet of the oil inlet to the outlet of the return flow. Guide the fuel directly back to the fuel tank. Because the structure through which the recirculation passes is relatively static, lacks sufficient power, and is too sensitive to the installation posture, the fuel vapor is still likely to accumulate inside and outside the fuel supply unit and affect it. normal work.
  • Another patent application for improvement CN1458403A “Electronically controlled fuel injection device” is based on the former Above, the above “return line” is retained, and a check valve is added at the overflow outlet to prevent fuel vapor from entering the "pressure feed chamber”.
  • the present invention is directed to the prior art, and an object of the present invention is to provide an integrated fuel supply unit capable of actively suppressing the generation of fuel vapor and actively discharging steam, and having a simple and reliable structure.
  • An integrated fuel supply unit comprising: a reciprocating drive device and a driven plunger pump device, a fuel injection device, an oil inlet member, and an oil return member, from the oil inlet member to the oil feed member
  • the oil returning member has an oil return passage which is always kept unobstructed, and a part of the fuel in the oil return passage is ejected from the fuel injection device by the action of the plunger pump device, wherein the driving device comprises a coil and a sleeve and one of the a moving device that reciprocates in the sleeve under the action of a magnetic field of the coil, the moving device reciprocating in the return passage to generate a flow difference, thereby generating an oil return flow from the oil inlet member to the oil return member .
  • the present invention utilizes the accompanying flow produced by the reciprocating motion of the motion device in the return passage to form a return flow from the oil inlet member to the oil return member.
  • the reciprocating motion of the moving device in the oil return passage inevitably produces the accompanying flow of fuel.
  • This accompanying flow is characterized by two-way pulsation, and the flow difference (net flow) has three identical results: always maintaining one slave oil inlet Return flow to the oil return; always maintain a reverse oil flow from the oil return to the oil inlet; the flow direction is uncertain, sometimes positive (return direction), sometimes reverse.
  • the present invention confines the structure and motion of the motion device to the flow that produces the first condition, i.e., always maintains a return flow.
  • Factors affecting the reflow include the structure of the moving device, the shape of the return passage, and the ratio of the speed of the reciprocating motion. They affect the flow difference in the following manner: due to the geometry of the moving device The effect is that when the resistance of the fluid movement in the return direction is greater than the reverse resistance, it is beneficial to increase the oil return; due to the influence of the geometry of the oil return passage, it is advantageous to increase the flow coefficient in the oil return direction.
  • the coil forms a pulsed magnetic field through the input PWM voltage wave to drive the motion device, and the magnetic field force can be provided by one coil or two coils that generate different directions of force. If the magnetic field force is unidirectional, then the force in the other direction needs to be provided by spring or hydraulic means.
  • a simple structure of the exercise device of the present invention is an armature.
  • the armature described above is further provided with an armature oil passage in series with the oil return passage, thereby facilitating miniaturization of the device and reducing the movement resistance of the armature.
  • a modification of the above-described armature oil passage is that the flow area at the inlet in the oil return direction is greater than or equal to the flow area at the outlet.
  • the fluid resistance encountered by the armature in the oil return direction is greater than its reverse resistance.
  • the armature oil passage penetrates the armature center. In this way, it not only facilitates the reasonable distribution of the magnetic field, but also reduces the processing difficulty.
  • an arch-shaped force transmitting member spanning the inlet of the armature oil passage is provided on the front end surface of the armature and the plunger, so that the armature can reduce the fluid while driving the plunger pump device. Resistance.
  • the arch-shaped force transmitting member may be U-shaped or radially, may be fixed to the armature and/or the plunger, or may be independent of the two.
  • the return movement of the armature in the oil return direction of the present invention is limited by the oil returning member, and a boss on the rear end surface of the armature is disposed around the outlet of the armature oil passage, and is disposed on the oil returning member There is a stepped hole that can avoid the movement of the boss and match the shape.
  • the boss-stepped hole structure can not only increase the fluid resistance of the armature in the oil return direction, but also reduce the impact noise between the oil return member and the oil return member.
  • the boss and the stepped hole can be transposed or have various other forms.
  • the boss is disposed above the oil returning member, and the rear end of the armature is provided with a stepped hole.
  • the oil returning member of the present invention is provided with a return oil passage in series with the oil return passage, and the oil return passage includes a rectifying section, and the fuel has a larger flow coefficient in the return flow direction when the fuel passes through the rectifying section from both directions.
  • the armature oil passage of the present invention is disposed between the armature and the sleeve, which makes it easier to arrange the transmission of force between the armature and the plunger.
  • the moving device of the present invention may further comprise an oil return driving member synchronously moving with the armature, the oil return driving member is provided with a moving oil return passage in series with the oil return passage, and the oil return driving member is located at the oil returning member and the armature between.
  • the design principle of the moving oil return passage is similar to that of the armature oil passage, that is, the movement of the oil return driving member in the oil return direction is subjected to more fluid resistance than the reverse direction.
  • the plunger pump device of the present invention comprises a plunger and a pressure chamber that cooperates with the plunger to pump fuel, and a suction passage is provided between the pressure chamber and the oil return passage, and the plunger is moved by the movement device Driven, reciprocating movement of oil suction/pressure feed.
  • the plunger is sucking, fuel enters the pressure chamber through the suction passage.
  • part of the fuel or fuel vapor in the pressure chamber is discharged through the suction passage.
  • the suction passage is closed by the plunger movement, the fuel is effectively pumped.
  • a further improvement of the above-mentioned plunger pump device is that an oil suction check valve is further disposed between the pressure chamber and the oil return passage.
  • the fuel When the plunger is sucked, the fuel first enters the pressure through the suction check valve and then through the suction passage. In the initial stage of the pressure feeding movement, part of the fuel or fuel vapor in the pressure chamber is discharged through the suction passage. When the suction passage is closed by the plunger movement, the fuel is effectively pumped.
  • suction passage is also connected in series with a one-way oil spill valve leading to the oil return passage through which fuel can only enter the pressure chamber.
  • Another solution of the plunger pump device of the present invention is characterized in that: the suction passage is open to the oil return passage through a one-way oil spill valve, and an oil suction check valve is provided at the oil return passage in the oil return passage.
  • the pressure chamber is connected through the suction passage.
  • Another solution of the plunger pump device of the present invention is to provide a flow fine adjustment device between the pressure chamber and the oil return passage, the flow fine adjustment device includes a measuring hole and a fine adjustment screw, and the measuring hole connects the pressure chamber and the oil return passage through The fine adjustment screw can cut or change the flow rate through the orifice.
  • the inlet of the oil suction check valve in the above-mentioned plunger pump device may be provided with a filtering device for preventing bubbles or fuel impurities from entering the pressure chamber.
  • the fuel injection device may be only a fuel discharge port; or may include an oil discharge valve and an atomization nozzle to obtain a better atomization mixing effect.
  • the above-mentioned oil discharge valve is composed of a valve body, a valve seat and a spring, wherein the valve body is a sphere, the valve seat is an axisymmetric curved surface, or the valve body is a flat sheet, and the valve seat is an elastic member.
  • the atomizing nozzle is composed of a nozzle body, a valve stem and a spring, wherein a tapered body or a spherical body at a front end portion of the valve stem forms a valve body, a tapered surface on the nozzle body forms a valve seat, and an oil inlet hole is formed in the nozzle body;
  • the rear end of the valve stem is provided with a spring seat, and the axial gap between the valve stem and the nozzle body forms the maximum lift of the valve stem.
  • a filtering device may be provided at the inlet of the nozzle to prevent the valve stem of the nozzle from getting stuck.
  • the atomizing nozzle in the fuel injection device further comprises a flow guiding cover disposed at the outlet, and the flow guiding cover is provided with one or more fuel outlets.
  • the ratio of the maximum flow area to the plunger cross-sectional area of the valve stem of the above atomizing nozzle is limited to 0.025.
  • Fuel is injected into the intake port or cylinder of the internal combustion engine through the integrated fuel supply unit. This achieves port injection and direct injection in the cylinder.
  • the application range of the integrated oil supply unit of the present invention is a small engine, including but not limited to a car, a motorcycle, a generator, a general gasoline engine, a small aircraft, a small watercraft engine, and can be used for a gasoline engine or a diesel engine or other alternative fuel engines. It can be used for port injection and in-cylinder direct injection combustion systems.
  • FIG. 1 is a schematic structural view of a first embodiment of an integrated oil supply unit provided by the present invention.
  • FIG. 2 is a schematic structural view of a second embodiment of an integrated oil supply unit provided by the present invention.
  • 4 is a partial structural schematic view of a fourth embodiment of an integrated oil supply unit provided by the present invention.
  • FIG. 5 is a partial structural schematic view of a fifth embodiment of an integrated oil supply unit provided by the present invention.
  • FIG. 6 is a partial structural schematic view of a sixth embodiment of an integrated oil supply unit provided by the present invention.
  • FIG. 7 is a partial structural schematic view of a seventh embodiment of an integrated oil supply unit provided by the present invention.
  • FIG. 8 is a partial structural schematic view of an eighth embodiment of an integrated oil supply unit provided by the present invention.
  • Fig. 9 is a view showing the configuration of an engine oil supply system according to an embodiment of the present invention.
  • the integrated oil supply unit of the present invention comprises: a driving device 20 for providing reciprocation and a driven plunger pump device 30, one fuel discharge The device 90, an oil inlet member 13, and an oil return member 14.
  • the drive unit 20 includes a coil 25, a sleeve 27, a yoke 26, and a magnetic gap 28 and a motion device 10 that reciprocates in the sleeve 27 under the action of the magnetic field of the coil 25.
  • the oil returning member 14 includes an oil return passage 12, an oil returning body 50 and a rectifying section 51, and the rectifying section 51 is connected in series with the oil return passage 15 and the return passage 12.
  • the rectifying section 51 is a stepped trapezoidal passage, and the flow coefficient flowing through the rectifying section 51 from the oil returning direction is larger than the flow coefficient flowing in the reverse direction.
  • the oil returning member 14 is connected to the oil returning low pressure oil pipe.
  • the motion device 10 includes an armature 21, which is substantially cylindrical, reciprocating linearly moving in a space of approximately cylindrical shape of the sleeve 27, the side of the space being guided by a magnetically conductive sleeve 27 and a non-magnetic magnetic gap 28 is delineated, one end is defined by the oil returning member 14, and the other end boundary is defined by the plunger pump unit 30.
  • the front end face of the pivot 21 is located within the length of the magnetic gap 28.
  • the center of the armature 21 is formed as an armature oil passage 22, and the flow area of the inlet portion 22a of the armature oil passage 22 is greater than or equal to the minimum cross-sectional area of the entire passage.
  • the passage portion is tapered, that is, the inlet.
  • the portion 22a is the maximum flow area, and the outlet portion 22b of the armature oil passage 22 has the smallest cross-sectional area. This design is advantageous for increasing the fluid resistance of the armature in the oil return direction or reducing the reverse resistance.
  • the movement of the armature 21 by the plunger 31 to feed the fuel is achieved by electromagnetic force, and its return movement is performed by the springs 36 and/or 36a.
  • the rear end of the armature 21 has a boss 23 surrounding the central armature oil passage 22, and a stepped hole 29 is formed at the entrance of the rectifying section 51 of the oil returning body 50 to avoid the boss 23, and the depth and diameter of the stepped hole 29 are larger than Or equal to the height of the boss 23 at the rear end of the armature 21.
  • the plunger pump unit 30 includes a plunger 31, a pump body 49, a pressure chamber 32, and a return spring 36 disposed within the pressure chamber 32 for resetting the plunger movement.
  • the return spring 36 is disposed in the pressure chamber 32 or other place where the return force can be applied to the plunger 31, and the return spring 36 may be one or more than one.
  • the plunger 31 is substantially cylindrical in shape and is disposed coaxially with the armature 21 and moves within a cavity within the pump body 49.
  • the armature 21 drives the plunger 31 to reciprocate by providing an arch-shaped force transmitting member 24 therebetween.
  • the arch-shaped force transmitting member 24 may be fixed to the inlet edge of the armature oil passage 22, may span or may protrude from the armature 21; or the force transmitting member 24 may be radially fixed to the plunger 31.
  • the armature 21, the force transmitting member 24 and the plunger 31 can also be designed as one body; The fluid in the return passage 15 can smoothly flow into the armature oil passage 22 of the armature 21.
  • a spring 36a is disposed between the pump body 49 and the armature 21, and the end of the spring 36a is located at the shoulder of the armature 21, and one end is freely contacted on the end surface of the pump body 49.
  • the return spring 36a can increase the reset speed of the armature to facilitate oil return, promote the pumping capacity of the moving device, and at the same time reduce the volume of the pressure chamber and correspondingly reduce the volume of the oil supply unit.
  • the motion device 10 Under the action of the springs 36 and/or 36a, the motion device 10 has a sufficiently large return speed, and the reciprocating motion of the motion device 10 generates a flow difference in the oil return passage 15 to maintain the oil inlet member 13 to the oil return member. 14 oil return flow.
  • a longitudinal opening or groove in the pump body 49 is formed as part of the oil return passage 15. Pump body 49 and plunger
  • the 31 defines a space for reciprocating movement of the plunger 31.
  • the cavity of the bore of the pump body 49 is a sliding wall surface 32a for reciprocating the plunger and a non-sliding surface 32b which is not in contact with the plunger 31.
  • the suction passage 33 connecting the pressure chamber 32 and the return passage 15 is provided on the sliding wall surface 32a, and the sliding wall surface 32a is engaged with the plunger 31 as required by the ordinary plunger type oil pump; the pressure chamber 32 is the cavity and the column of the pump body 49.
  • the armature 21 drives the plunger 31 to move toward the pressure chamber 32, and some of the fuel in the pressure chamber 32 may be present along with The gas flows out through the suction passage 33; when the suction passage 33 is closed by the movement of the plunger 31, the fuel in the pressure chamber 32 is squeezed, and the pressure exceeds the limit value to the fuel injection device 90, and the pressure feed stroke ends; The plunger 31 starts the suction stroke by the return spring 36.
  • the oil inlet of the fuel injection device 90 is disposed on the non-sliding wall surface 32b of the pressure chamber 32.
  • the fuel injection device 90 includes an oil discharge valve 70 and an atomizing nozzle 60.
  • the oil discharge valve 70 is composed of a valve body 71, a valve seat 72 and a spring 73. Composition, wherein the valve body 71 is a sphere, the valve seat 72 is an axisymmetric curved surface, or the valve body 71 is flat The face sheet, the valve seat 72 is an elastic member.
  • the atomizing nozzle 60 is composed of a nozzle body 62, a valve stem 61 and a spring 65.
  • the tapered body or the spherical body of the front end portion 69a of the valve stem 61 forms a valve body, and the tapered surface 69b on the nozzle body forms a valve seat, which is pretensioned at the spring 65.
  • valve stem 61 Under the action of the force, the valve stem 61 is seated on the tapered surface 69b of the nozzle body such that the atomizing nozzle 60 is in a closed state, the nozzle body 62 is provided with an oil inlet hole 68; and the rear end portion is provided with a spring seat 66, which is connected with the nozzle The axial clearance between the bodies 62 forms the maximum lift of the valve stem 61.
  • the fuel injection port 74 is an oil outlet of the oil discharge valve 71.
  • a filter 67 is further disposed between the fuel injection port 74 and the oil inlet hole 68 for preventing impurities from entering the oil hole 68 and reaching the nozzle body 62 of the valve stem 61. In the gap between the fits.
  • the fuel After the pressure in the pressure chamber 32 reaches the defined pressure, the fuel enters the fuel chamber of the fuel injection device 90, and enters the nozzle seat surface through the oil inlet 68 through the filter 67.
  • the valve stem 61 When the fuel pressure is higher than the preload of the spring 65, the valve stem 61 The top is ejected outward, the nozzle is opened, and the fuel is ejected.
  • the axis of the fuel injection device 90 of the present invention may be parallel or perpendicular to the direction of movement of the plunger 31, or may be at an angle to accommodate the optimum fuel injection direction.
  • the oil inlet member 13 includes an oil inlet passage 11, and the oil inlet member 13 is connected to an external low pressure oil supply pipe, and the oil inlet passage 11 communicates with the oil return passage 15 of the plunger pump unit 30.
  • the front end face of the armature 21 is located within the length of the non-magnetically permeable magnetic gap 28, and the coil 25 forms a pulsed magnetic field by the input PWM voltage wave to drive the armature 21 to move forward, the armature 21
  • the plunger 31 is pushed down by the force transmitting member 24, and the springs 36a and 36 are compressed to start the pressure feed stroke of the fuel.
  • the suction passage 33 provided in the sliding wall surface 32a of the pressure chamber 32 communicates with the pressure chamber 32 and the oil return passage 15, and part of the fuel in the pressure chamber 32 and possibly fuel vapor are discharged from the suction passage 33 to the back. Oil passage 15.
  • the plunger 31 continues to descend, closing the suction passage 33, at which time the fuel in the pressure chamber 32 is squeezed.
  • the oil discharge valve 70 is opened, and the fuel in the pressure chamber 32 enters the fuel chamber of the fuel injection device 90 through the high pressure passage, and the impurities are filtered through the filter 67 when the fuel pressure is higher.
  • the valve stem 61 is pushed outward, and the fuel enters the nozzle seat surface 69b from the oil inlet hole 68 in the nozzle body 62, and the fuel is ejected.
  • the valve stem 61 starts to seat and the nozzle is closed.
  • the fuel ends the injection, and the plunger 31 performs a return movement under the action of the return spring 36, and at the same time, the suction stroke of the fuel is performed, and the fresh fuel enters the return passage 15 from the oil inlet passage 11, when the plunger
  • the movement of 31 again opens the suction passage 33 the fuel is sucked into the pressure chamber 32 by the suction passage 33, and at the same time, the fuel in the oil return passage 15 is electrically passed along the return passage 15 under the action of the armature 21 returning movement.
  • the pivot oil passage 22 is discharged from the oil returning member 14 for cooling the air body and discharging air bubbles.
  • the reciprocating motion of the armature 21 can generate a sufficient net return flow, thereby effectively cooling the body and Eliminate steam to ensure a stable fuel injection.
  • Embodiment 2 As shown in FIG. 2, the armature 21 of the moving device of the present embodiment includes a section of tapered oil passage 22c. Due to the existence of the tapered oil passage 22c, the armature 21 is subjected to reciprocation and received in the reflow direction. The fluid resistance is greater than the reverse resistance, thereby promoting the generation of a flow difference in the return direction.
  • the rear end of the armature 21 has a boss 23 surrounding the central armature oil passage 22, and the oil returning member 14 is provided with a stepped hole 29 which can avoid the boss 23, and the depth and diameter of the stepped hole 29 are greater than or equal to the armature 21 The height of the boss 23 at the rear end and the diameter.
  • a space is provided between the pressure chamber 32 and the oil return passage 15.
  • An oil suction check valve 40 whose outlet is provided on the non-sliding wall surface of the pressure chamber 32 is intended to reduce the resistance of the plunger to the return movement and further reduce the possibility of steam entering the pressure chamber.
  • a filter device 44 is disposed at the inlet of the oil suction check valve 40, and the filter device may be a normal filter screen.
  • the oil suction check valve 40 includes a valve body 41, a spring 43, and a valve seat 42, wherein the valve body 41 can be a ball, and the valve seat 42 can be an axisymmetric curved surface.
  • the oil suction check valve 40 is closed; at the beginning of the oil suction phase, the suction passage 33 is closed, the pressure in the pressure chamber 32 is low, the oil suction check valve 40 is opened, and the fuel in the oil return passage 15 is passed through the open oil suction meter.
  • the valve 40 flows into the pressure chamber 32, and the plunger 31 continues to move up to the suction passage 33, and the fuel enters the pressure chamber 32 through the oil suction check valve 40 and the suction passage 33 at the same time.
  • a flow fine adjustment device 80 is further disposed between the pressure chamber 32 and the oil return passage 15, and the flow fine adjustment device 82 includes a measuring hole 81 and a fine adjustment screw 82.
  • the measuring hole 81 is connected to the pressure chamber 32 and the oil return passage 15, and can be cut by the fine adjustment screw 82.
  • the orifice 81 or the fuel flow through the orifice 81 is changed.
  • the purpose of setting up the flow fine-tuning device 80 is to increase the consistency of the flow.
  • a flow guide 63 is provided in front of the injection direction of the atomizing nozzle 60, and the flow guide 63 and the front end of the valve stem 61 and the nozzle body 62 are provided.
  • one or more fuel outlets 64 may be opened in the shroud 63 depending on the specific mounting position of the oil supply unit for changing the taper angle and direction of the injection.
  • valve body 61 moves toward the residual volume 63a, and the nozzle is opened, and at least one fuel outlet 64 opened by the flow guide 63 is opened. ejection.
  • Embodiment 3 The oil supply unit provided by the present invention as shown in FIG. 3
  • the motion device 10 further includes an oil return driving member 52 that moves in synchronization with the armature 21, and is disposed on the oil return body 50 and the electric power. Between the bridges 21.
  • the oil return driving member 52 is provided with a moving oil return passage 53 connected in series with the oil return passage 15, and the moving oil return passage 53 is a tapered passage having a large inlet, that is, a flow rate flowing through the oil return passage 53 from the oil returning direction. The coefficient is greater than the flow coefficient flowing in the opposite direction.
  • the side surface of the oil return driving member 52 is also provided with a side passage 18 that opens the oil return passage 53 to the sliding surface.
  • the oil return driving member 52 realizes synchronous movement with the armature 21 through a spring 36b provided at the front end thereof, and the spring 36b facilitates the reciprocation of the armature 21 in a manner to generate a flow difference.
  • the oil return driving member 52 may be fixed to the armature 21, or may be a separate member that is abutted against the armature 21, and may be disposed coaxially or non-coaxially.
  • the sleeves 27 near the two end faces are provided with lateral fuel passages 17 and 17a, and their axial lengths respectively cover the range of motion of the two end faces of the armature, so that at any moment, the fuel can be returned from the back.
  • the oil passage 15 enters the bypass fuel passage 16 through the lateral fuel passage 17a, and then enters the side passage 18 from the lateral fuel passage 17, and then enters the moving oil return passage 53.
  • the oil return passage 15 - the lateral fuel passage 17a - the bypass fuel passage 16 - the lateral fuel passage 17 - the side passage 18 - the moving return passage 53 constitute a fuel passage that is always in communication, with this fuel passage, even if there is no
  • the flow area of the armature oil passage 22d or the armature oil passage 22d is small, and an oil return flow can also be generated by the reciprocating motion of the oil return driving member 52 and the armature 21.
  • a portion of the lateral fuel passage 17a is spatially overlapped with the magnetic gap 28, which is made of a non-magnetic material such as brass or the like.
  • a boss-stepped hole structure can still be provided to reduce the impact and the flow difference which is advantageous for generating the oil return direction.
  • a tapered stepped rectifying section 51 may also be provided on the oil returning member 14, thereby enhancing the oil returning ability.
  • Embodiment 4 The fourth embodiment shown in FIG. 4, this embodiment is the same as the embodiment 3 as a modified embodiment of the driving device.
  • the armature oil passage 22e is a longitudinal direction processed around the cylinder of the armature 21. Hole or groove.
  • the armature oil passage 22 can reduce the weight of the armature 21 and the resistance of the movement of the armature 21. Improve the high speed characteristics of the armature 21 movement.
  • the armature oil passage 22e is connected in series and in the oil return passage 15.
  • a return oil chamber 54 facing the armature is provided on the oil return member 14.
  • the oil return chamber 54 can be a simple hole in series with the oil return passage 12, and the size of the opening matches the armature oil passage 22e.
  • the matching principle is: When the armature and the oil return member are in close contact, the electric power can still be maintained.
  • the communication between the oil passage 22e and the oil return chamber 54 is such that there is a certain overlap between the opening of the oil return chamber 54 and the armature oil passage 22e; when the return movement of the armature 21 approaches the oil return member 14, the armature oil
  • the effective flow area of the passage 22e is reduced, and the fluid resistance received is increased, thereby facilitating the generation of the flow difference in the oil return direction.
  • the difference in flow rate in the return direction facilitates the removal of heat and steam from the body.
  • Embodiment 5 As shown in the fifth embodiment shown in FIG. 5, the oil returning member 14 of the present embodiment includes an oil return passage, and the oil return passage is composed of an oil passage 55 and a ring groove 56 communicating with the same, and the armature 21 is provided with an armature oil passage 22, and a side hole 19 communicating with the armature oil passage 22 is provided at a rear end surface of the armature 21.
  • the annular groove 56 When the return movement of the armature 21 approaches the oil returning member 14, the annular groove 56 is covered by the side portion of the armature 21, and when the rear end surface of the armature 21 abuts against the end surface of the oil returning member 14, the annular groove 56 only passes.
  • the side hole 19 communicates with the armature oil passage 22, and in this process, the return movement of the armature 21 causes the effective flow area of the armature oil passage 22 to decrease, and the fluid resistance received increases, thereby contributing to an increase in oil return. the amount.
  • the embodiment provides a structure for increasing the operating frequency.
  • the driving device 20 includes a working coil 25a and a return coil 25, and a magnetic gap 28a and a return magnetic gap 28.
  • the working coil 25a and the return coil 25 are coaxially disposed. Controlled by two mutually independent PWMs, an alternating magnetic field is generated.
  • the magnetic circuit formed by the working coil 25a drives the armature 21 to move forward, and the magnetic circuit formed by the return line 25 is used to help the armature 21 return. This improvement not only accelerates the return speed of the armature 21, thereby increasing the amount of oil return, but also increases the operating frequency of the device.
  • Embodiment 6 The sixth embodiment shown in FIG. 6 is different from Embodiment 5 in that a check valve 50 is provided between the armature oil passage 22 and the oil return passage 12, and the check valve 50 includes the valve body 58. , the spring 591 and the valve seat 59, wherein the valve body 50 is a sphere, the valve seat 59 is an axisymmetric curved surface; or the valve body 50 It is a flat sheet, and the valve seat 59 is an "O" ring.
  • the inlet of the one-way valve 50 is connected to the armature oil passage 22, and the outlet is provided on the oil return passage 12.
  • the check valve 50 is connected in parallel with the fuel passage 55 to keep the oil passage 15 open at all times. Due to the existence of the unidirectional width 50, the flow coefficient of the fuel passing through the oil return passage 12 is greater than the reverse direction in the oil return direction, thereby generating a flow rate for promoting oil return.
  • Embodiment 7 As a seventh embodiment shown in FIG. 7, as a further improvement of the plunger pump device 30 of the first embodiment, an oil suction check valve 40 is provided between the pressure chamber 32 and the oil return passage 15, and an outlet thereof is provided. In the non-sliding wall surface of the pressure chamber 32, the suction passage 33 is connected in series to a one-way oil spill valve 46 leading to the oil return passage 15, and the outlet is provided in the return passage 15.
  • the oil suction check valve 40 includes a valve body 41, a spring 43 and a valve seat 42, and a fuel filtering device 44 may be provided at the inlet thereof.
  • the oil spill valve 46 includes a valve body 47, a spring 149, and a valve seat 48. If the valve body 47 can be seated by gravity, the spring 149 can be omitted.
  • the suction passage 33 is closed by the one-way relief valve 46, and the fuel to the pressure chamber 32 is all supplied by the oil suction check valve 40, blocking the fuel vapor of the oil return passage 15, and further avoiding the fuel vapor. It is returned to the pressure chamber 32 through the suction passage 33.
  • Embodiment 8 The eighth embodiment shown in FIG. 8 further improves the plunger pump device 30 of the first embodiment.
  • the suction passage 33 passes through the one-way oil spill.
  • the valve 100 leads back.
  • the oil passage 15, the oil suction check valve 110 communicates the oil return passage 15 with the pressure chamber 32 through the suction passage 33, and the oil inlet port of the oil suction check valve 110 is provided on the oil return passage 15.
  • the one-way oil spill valve 100 includes a wide body 102, a spring 101, and a valve seat 103, and if the valve body 47 can be seated by gravity, the spring 101 can be omitted.
  • the oil suction check valve 110 is composed of a valve body 111, a spring 113, and a valve seat 112, which is a conventional one-way valve structure.
  • the plunger 31 starts the return movement by the return spring 36, and starts the fuel suction stroke.
  • the fuel enters the return passage 15 from the oil inlet passage 11 and passes through the oil suction check valve.
  • the 110 enters the pressure chamber 32 from the suction passage 33, at which time the one-way oil spill valve 100 is closed, preventing the possibility of residual steam being drawn into the pressure chamber 32.
  • This structure is advantageous for simplifying the structure and miniaturizing the integrated oil supply unit.
  • Embodiment 9 An actual application example of the integrated fuel supply unit of the present invention as shown in Fig. 9 on an engine.
  • the fuel enters the cavity 7a of the vapor-liquid separator 7 from the fuel tank 6 through the filter 4a and the fuel tank passage 241a and the filtering device 4, wherein the filtering device 4 is an optional member, and another alternative passage is a reserve oil passage, which is The backup filter 4b, the reserve fuel tank passage 241b, and the fuel switch 9 are constructed.
  • the fuel shutoff 9 is opened and the backup oil passage is activated.
  • the fuel in the cavity 7a passes through the oil inlet pipe 3 to the oil inlet member 13 of the integrated oil supply unit 1 of the present invention, and a part of the fuel is injected into the intake port (or cylinder) of the engine 2 through the injection device 90, and the rest is returned from the oil.
  • the member 14 is discharged and returned to the cavity 7a of the vapor-liquid separator 7 through the oil return pipe 5.
  • the fuel vapor in the integrated oil supply unit 1 of the present invention is brought to the cavity 7a of the vapor-liquid separator 7 by the oil return flow, and the fuel vapor therein is discharged to the liquid level 6a of the oil tank 6 through the exhaust line 8.
  • the inlet of the venting line 8 is above the cavity 7a, and the outlet is always maintained above or near the liquid level 6a.

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Description

一种集成式供油单元
技术领域
本发明属于发动机技术领域, 具体涉及电子喷油装置, 尤其涉及一种应 用于小型发动机的电子燃油喷射系统。
背景技术
现有的 BOSCH 电子燃油喷射系统由嵌入在燃油箱中的旋转电磁泵提供 燃油, 燃油通过高压油路并经调压后到达喷嘴, 电子控制单元 (ECU) 控制 喷嘴将燃油定量定时地喷入进气歧管。 在应用到小型高速发动机时, 例如摩 托车发动机, 会存在成本高、 安全性差以及进气压力波动影响大等问题。
中国发明专利 CN1133810C "电动燃油喷射装置"提供了一种新型的脉 冲式电磁驱动的燃油喷射装置, 由燃料进入装置、 燃料驱动装置和燃料喷出 装置组成, 通过燃料驱动装置的工作线圈和回位线圈形成磁回路驱动包含衔 铁和柱塞的从动装置, 实现吸油喷油的往复循环。 此发明提供的集成式供油 单元可以通过低压油管直接从燃油箱中取得燃油。
集成式供油单元在应用上可能会遇到以下问题: 安装姿态严格限制、 发 动机长时间搁置、热车状态启动、长时间怠速以及高温大负荷行驶等情况下, 供油单元内外的燃油通道中产生的燃油蒸汽会严重地干扰正常的供油。为此, 需要提出更加完善的结构方案以有效地抑制燃油蒸汽的产生并迅速地排除已 经产生的蒸汽。
专利申请 CN1474910A "电子控制燃料喷射装置" 中特别强调了可能发 生的上述问题, 因此它从进油的入口到回流的出口在线圈与气缸之间设置了 一个旁通的 "回流管路"用以导引燃油直接回到燃料箱, 由于这种回流所通 过的结构均处于相对静止状态, 缺乏足够的动力, 对安装姿态过于敏感, 燃 油蒸汽仍然极有可能集聚在供油单元内外并影响它的正常工作。 另一项具有 改进意义的专利申请 CN1458403A "电子控制燃料喷射装置"在前者的基础 上, 即保留上述"回流管路", 在其溢流出口处增加了一个单向阀以防止燃油 蒸汽进入 "压送室"。
上述专利或者专利申请没有提出主动抑制燃油蒸汽产生和动力排除蒸汽 的结构机制, 对于安装姿态有着严格的限制, 因此在实际应用上仍然不能完 全避免上述问题的发生。
发明内容
本发明针对现有的问题, 之目的在于提供一种能够主动抑制燃油蒸汽的 产生和主动排出蒸汽、 结构简单、 可靠的集成式供油单元。
本发明的目的通过以下技术方案实现:
即一种集成式供油单元, 其包括: 一个提供往复运动的驱动装置和一个 被驱动的柱塞泵装置, 一个燃油喷出装置, 一个进油件, 一个回油件, 从进 油件到回油件有一条始终保持畅通的回油通路, 回油通路中的部分燃油通过 柱塞泵装置的作用从燃油喷射装置喷出, 其特征在于: 驱动装置包括线圈和 套筒以及一个在所述线圈之磁场作用下在套筒中做往复运动的运动装置, 所 述运动装置在所述回流通路中以产生流量差的方式往复运动, 从而产生从进 油件到回油件的回油流动。
本发明利用运动装置在回油通路中的往复运动所产生的伴随流动, 形成 一个从进油件到回油件的回油流动。所述运动装置在回油通路中的往复运动, 必然会产生燃油的伴随流动,这个伴随流动的特点是双向脉动,其流量差(净 流量) 有三种 同的结果: 始终保持一个从进油件到回油件的回油流动; 始 终保持一个从回油件到进油件的反回油流动; 流向不确定, 有时正向 (回流 方向), 有时反向。本发明将所述运动装置之结构和运动方式限定在产生第一 种情况的流动, 即始终保持一个回油流动。
影响回流的因素有运动装置的结构、 回流通路的形状以及往复运动的速 度之比等等。 它们以下述方式影响所述流量差: 由于运动装置之几何形状的 影响, 在回位方向受到的流体运动阻力大于其反向阻力时, 则有利于增大回 油量; 由于回油通路之几何形状的影响, 在回油方向增大流量系数时, 则有 利于增大回油量; 由于运动装置之速度比的影响, 运动装置在回位方向 (即 回流方向) 的速度提高时, 则有利于回油流量的增大; 当运动装置的回位运 动使得通过燃油通道的有效流通面积减小时, 有利于增大回油量。
所述线圈通过输入的 PWM电压波形成脉冲磁场以驱动运动装置, 磁场 力可以由一个线圈或者两个产生不同方向力的线圈提供。 如果磁场力是单向 的, 那么另一个方向的力则需要弹簧或者液压等其它方式提供。
本发明之运动装置的一种简单结构为一个电枢。
上述的电枢还设有与所述回油通路串联的电枢油道, 从而有利于该装置 的小型化, 并减小电枢的运动阻力。
上述电枢油道的一种改进方案是:在回油方向的入口处的流通面积大于或 者等于出口处的流通面积。 这样, 电枢在回油方向所遇到的流体阻力要大于 其反向阻力。
上述电枢油道的更进一步简化布置是: 电枢油道贯通电枢中心。 这样, 不 仅有利于磁场的合理分布, 而且能够降低加工难度。
在上述方案的基础上, 在电枢与柱塞接触的前端面设有一个跨越电枢油 道入口的拱形传力件, 从而使得电枢在驱动柱塞泵装置的同时又能够减小流 体的阻力。 所述拱形传力件可以是 U字形的, 也可以呈放射状, 可以固定于 电枢和 /或柱塞, 也可以独立于两者。
本发明之上述电枢在回油方向的回位运动由所述回油件限位,在所述电枢 的后端面设有一个围绕电枢油道出口的凸台, 在回油件上设有一个能够避让 所述凸台运动并且形状与之相匹配的阶梯孔。 所述的凸台一阶梯孔结构不但 可以增大电枢在回油方向的流体阻力, 而且可以减小与回油件之间的冲击噪 音。基于此思想, 所述凸台和阶梯孔可以换位设置或者有其它各种不同形式, 例如, 将凸台设于回油件之上, 电枢后端设有阶梯孔。
本发明之回油件设有一个与回油通路串联的回油道,回油道包含一个整流 段, 燃油从两个方向通过整流段时, 在回油流动方向具有更大的流量系数。
本发明之电枢油道设置在电枢与套筒之间,这样比较容易安排电枢与柱塞 之间力的传递。
本发明之运动装置还可以包括一个与电枢同步运动的回油驱动件,回油驱 动件设有与所述回油通路串联的动回油道, 回油驱动件位于回油件和电枢之 间。 此动回油道的设计原理与所述电枢油道相似, 即使得回油驱动件在回油 方向的运动受到比反向更多的流体阻力。
本发明之柱塞泵装置包括一个柱塞和一个与柱塞相互配合压送燃油的压 力室, 在压力室和所述回油通路之间设有一个吸溢通道, 柱塞被所述运动装 置所驱动, 进行吸油 /压送的往复运动, 柱塞吸油运动时, 燃油通过吸溢通道 进入压力室, 柱塞在压送运动的初期, 压力室中的部分燃油或者燃油蒸汽通 过吸溢通道排出, 当所述吸溢通道被柱塞运动关闭时, 则开始对燃油进行有 效压送。
上述柱塞泵装置之进一步的改进方案是,在压力室和回油通路之间还设有 一个吸油单向阀, 柱塞吸油运动时, 燃油先通过吸油单向阀再通过吸溢通道 进入压力室, 柱塞在压送运动的初期, 压力室中的部分燃油或者燃油蒸汽通 过吸溢通道排出, 当吸溢通道被柱塞运动关闭时, 则幵始对燃油进行有效压 送。
上述柱塞泵装置之更进一步的改进方案是,吸溢通道还串联一个通向所述 回油通路的单向溢油阀, 燃油只能通过所述吸油单向阀进入压力室。
本发明之柱塞泵装置之另一种方案是, 其特征在于: 吸溢通道通过一个单 向溢油阀通向所述回油通路, 一个进油口设在回油通路的吸油单向阀通过所 述吸溢通道连通压力室。 本发明之柱塞泵装置之再一种方案是,在压力室与回油通路之间设有流量 微调装置, 流量微调装置包括量孔和微调螺钉, 量孔连接压力室和回油通路, 通过微调螺钉可以切断或者改变通过量孔的流量。
本发明之集成式供油单元,上述柱塞泵装置中的吸油单向阀的入口处还可 以设有防止气泡或者燃油杂质进入压力室的过滤装置。
本发明之集成式供油单元, 燃料喷射装置可以仅为燃料喷出口; 或者包括 出油阀和雾化喷嘴, 以获得更佳的雾化混合效果。
上述的出油阀由阀体、 阀座及弹簧组成, 其中阀体是球体, 阀座是轴对称 曲面, 或者阀体是平面薄片, 阀座是弹性件。
上述的雾化喷嘴由喷嘴体, 阀杆以及弹簧组成, 其中阀杆的前端部的锥形 体或者球形体形成阀体, 喷嘴体上的锥面形成阀座, 喷嘴体上开有进油孔; 阀杆后端部设有弹簧座, 它与喷嘴体之间的轴向间隙形成阀杆的最大升程。 另外, 在喷嘴的入口处还可以设置过滤装置, 以防止喷嘴之阀杆卡住。
本发明提供的集成式供油单元, 其燃料喷射装置中的雾化喷嘴还包括设 在出口的导流罩, 导流罩设一个或者多个燃油出口。
上述雾化喷嘴的阀杆, 在开启时的最大流通面积与柱塞截面积之比限定 在 0.025之内。
将燃油通过所述集成式供油单元喷入内燃机的进气道或汽缸。 从而实现 进气口喷射和缸内直接喷射。
本发明之集成式供油单元的应用范围是小型发动机,包括但不限于汽车, 摩托车, 发电机, 通用汽油机, 小型飞机, 小型水上艇用发动机, 可以用于 汽油机或者柴油机或者其它代用燃料发动机, 可以用于进气道喷射和缸内直 接喷射燃烧系统。
附图说明
下面结合附图和具体实施方式对本发明做进一步详细描述: 图 1 为本发明提供的集成式供油单元的第一个实施例的结构示意图 图 2为本发明提供的集成式供油单元的第二个实施例的结构示意图 图 3为本发明提供的集成式供油单元的第三实施例局部结构示意图。 图 4为本发明提供的集成式供油单元的第四实施例局部结构示意图。 图 5为本发明提供的集成式供油单元的第五实施例局部结构示意图。 图 6为本发明提供的集成式供油单元的第六实施例局部结构示意图。 图 7为本发明提供的集成式供油单元的第七实施例局部结构示意图。 图 8为本发明提供的集成式供油单元的第八实施例局部结构示意图。 图 9为本发明的一实施例应用于发动机供油系统的构成图。
具体实施方式
实施例 1 : 如图 1所示, 在第一实施例中, 本发明的集成式供油单元包 括: 一个提供往复运动的驱动装置 20和一个被驱动的柱塞泵装置 30, 一个 燃油喷出装置 90, 一个进油件 13, 一个回油件 14。
从进油件 13到回油件 14有一条始终保持畅通的回油通路 15, 回油通路 15中的部分燃油通过柱塞泵装置 30的作用从燃油喷射装置 90喷出, 其余燃 油通过驱动装置 20经回油通路 15被输送到回油件 14。
驱动装置 20包括线圈 25、 套筒 27、 磁轭 26以及磁隙 28和一在所述线 圈 25之磁场作用下在套筒 27中做往复运动的运动装置 10。
回油件 14包括回油通道 12、 回油件体 50和整流段 51, 整流段 51与回 油通路 15以及回流通道 12连通串联。 整流段 51为一个阶梯状的梯形通道, 从回油方向流过整流段 51 的流量系数大于反方向流动的流量系数。 回油件 14与回油的低压油管相连接。
运动装置 10包括电枢 21, 电枢 21大致为圆柱体, 在套筒 27近似圆柱 形的空间中作往复直线运动,空间的侧面由导磁的套筒 27以及非导磁的磁隙 28划定, 一端被回油件 14划定, 另一端边界被柱塞泵装置 30划定。 电枢 21 与套筒 27之间存在适当的间隙以保持良好的滑动性, 电枢 21置于圆柱形空 间内, 可滑动自如地往复直线运动, 在初始位置即每个循环的初时时刻, 电 枢 21的前端面位于磁隙 28的长度之内。
电枢 21的中心贯通形成为电枢油道 22, 电枢油道 22的入口处 22a的流 通面积大于或等于整个通道的最小截面积, 较优的选择是通道一段设置成锥 形,即入口处 22a为最大流通面积,电枢油道 22的出口处 22b为截面积最小, 这种设计有利于增大电枢在回油方向运动受到的流体阻力, 或者减小反向的 阻力。 电枢 21通过柱塞 31压送燃油的运动通过电磁力实现, 其回位运动由 弹簧 36和 /或 36a完成。
电枢 21后端具有一个围绕中心电枢油道 22的凸台 23, 回油件体 50的 整流段 51入口处开设一个能避让凸台 23的阶梯孔 29, 阶梯孔 29的深度和 直径大于或者等于电枢 21后端的凸台 23高度。当电枢 21的回位运动接近回 油件体 50, 电枢 21的后端面与回油件体 50的端面趋于形成一个一定程度的 封闭空间, 此空间中的流体受到限制, 燃油因此而受到挤压同时减缓了电枢 21 回位对回油件体 50的冲击, 同时, 这种凸台一阶梯孔结构更有利于在回 油方向产生流量差。
柱塞泵装置 30包括柱塞 31、 泵体 49、 压力室 32以及置于压力室 32之 内用于柱塞运动复位的回位弹簧 36。 回位弹簧 36设在压力室 32内或者其它 能够对柱塞 31施加回位力的地方, 回位弹簧 36可以是一个或者多于一个。
柱塞 31的形状大致是一个圆柱体,与电枢 21同轴设置并在泵体 49内的 一个腔体内运动。电枢 21通过设置两者之间的拱形传力件 24驱动柱塞 31往 复运动。 拱形传力件 24可以固定在电枢油道 22的入口边缘, 可以跨设, 也 可以为电枢 21伸出的突出片; 也可以将传力件 24设计成放射状固定在柱塞 31上; 并且也可以将电枢 21、 传力件 24以及柱塞 31设计为一体; 只需要保 证回流通路 15中的流体能够通畅地流入电枢 21的电枢油道 22。
泵体 49 与电枢 21之间设弹簧 36a, 弹簧 36a—端位于电枢 21的凸肩, 一端自由接触于在泵体 49的端面上。回位弹簧 36a可提高所述电枢的复位速 度而得到有利于回油, 促进运动装置泵油能力, 同时可以减小压力室的体积, 相应缩小供油单元的体积。 在弹簧 36和 /或 36a的作用下, 运动装置 10有足 够大的回位速度, 运动装置 10的往复运动会在回油通路 15中产生一个流量 差, 以维持从进油件 13到回油件 14的回油流动。
泵体 49上纵向开孔或沟槽形成为回油通路 15的一部分。泵体 49与柱塞
31划定供柱塞 31往复运动的空间, 泵体 49内孔的腔体一段为供柱塞作往复 运动的滑动壁面 32a和与柱塞 31不接触的非滑动璧面 32b。 连通压力室 32 和回流通路 15的吸溢通道 33设在滑动壁面 32a上, 滑动壁面 32a按普通柱 塞式油泵的要求与柱塞 31配合; 压力室 32为泵体 49的腔体与柱塞 31形成 的空间。
在柱塞 31压送行程的初始位置时, 溢流通道 33、 压力室 32以及回流通 路 15连通; 电枢 21驱动柱塞 31向压力室 32运动, 压力室 32内的部分燃油 连同可能存在的气体通过吸溢通道 33流出;当吸溢通道 33被柱塞 31的运动 关闭后, 压力室 32 内的燃油因受挤压, 压力超过限定值流向燃油喷出装置 90, 压送行程结束; 柱塞 31在回位弹簧 36的作用下开始吸入行程, 在回位 过程中, 当溢流通道 33再一次被打开时, 燃油通过溢流通道 33进入压力室 32, 这时电枢 21正处于回位行程的末期, 回油通路 15中可能存在的燃油蒸 汽由于运动装置 10向回油方向的运动被带离溢流通道 33的入口部分, 溢流 通道 33附近为新鲜的燃油, 蒸汽进入压力室 32的可能性较小。
燃料喷射装置 90的入油口设在压力室 32的非滑动壁面 32b上, 燃料喷 射装置 90包括出油阀 70和雾化喷嘴 60, 出油阀 70由阀体 71、 阀座 72及弹 簧 73组成, 其中阀体 71是球体, 阀座 72是轴对称曲面, 或者阀体 71是平 面薄片, 阀座 72是弹性件。
雾化喷嘴 60由喷嘴体 62, 阀杆 61以及弹簧 65组成, 阀杆 61的前端部 69a的锥形体或者球形体形成阀体, 喷嘴体上的锥面 69b形成阀座, 在弹簧 65预紧力的作用下, 阀杆 61坐落于喷嘴体上的锥面 69b上使得雾化喷嘴 60 处于关闭状态, 喷嘴体 62上开有进油孔 68 ; 后端部设有弹簧座 66, 它与喷 嘴体 62之间的轴向间隙形成阀杆 61的最大升程。
燃油喷出口 74为出油阀 71的出油口, 在燃油喷出口 74与进油孔 68之 间还设有滤网 67, 用于阻止杂质从进油孔 68到达阀杆 61喷嘴体 62之间的 配合间隙中。
压力室 32内压力达到限定压力后,燃油进入燃料喷射装置 90的燃油腔, 经过滤网 67由进油孔 68进入喷嘴座面,当燃油压力高于弹簧 65的预紧力时, 阀杆 61朝向外顶出, 喷嘴开启, 燃油随之喷出。
本发明之燃油喷出装置 90的轴线可以与柱塞 31运动方向平行或者垂直, 也可以成某一个角度以适应最佳燃油喷射方向。
进油件 13包含一进油通道 11,进油件 13与外部的低压供油油管相连接, 进油通道 11与柱塞泵装置 30中回油通路 15连通。
以下为本发明提供的集成式供油单元的工作过程:
在每个循环的初始时刻, 电枢 21的前端面位于非导磁的磁隙 28的长度 之内, 线圈 25通过输入的 PWM电压波形成脉冲磁场以驱动电枢 21向前运 动, 电枢 21通过传力件 24顶压柱塞 31下移, 弹簧 36a和 36被压缩, 开始 燃料的压送行程。
在加压的初始阶段, 设在压力室 32滑动壁面 32a的吸溢通道 33与压力 室 32以及回油通路 15连通,压力室 32部分燃料以及可能存在的燃油蒸汽从 吸溢通道 33排出到回油通路 15。
柱塞 31继续下行, 关闭吸溢通道 33, 此时压力室 32中的燃油被挤压, 等压力室 32内压力升至给定压力时, 出油阀 70开启, 压力室 32中的燃油经 过高压通道进入燃料喷射装置 90的燃油腔, 经过滤网 67过滤杂质, 当燃油 压力高于弹簧 65的预紧力时, 阀杆 61向外顶出, 燃油由喷嘴体 62上的进油 孔 68进入喷嘴座面 69b, 燃油随之喷出。 当喷嘴体 62腔体内的油压对于阀 杆 61产生的作用力低于弹簧 65的作用力时, 阀杆 61开始落座, 喷嘴关闭。
线圈 25的通电关闭后燃油结束喷射,柱塞 31在回位弹簧 36的作用下做 回位运动, 同时进行燃料的吸引行程, 新鲜的燃油由进油道 11进入回流通路 15, 当柱塞 31的运动再次打开吸溢通道 33时, 燃油由吸溢通道 33被吸入压 力室 32, 与此同时, 回油通路 15中的燃油在电枢 21回位运动作用下沿回油 通路 15经电枢油道 22从回油件 14排出, 用以冷却机体并排出气泡, 当电枢 21回位至回油件体 50的阶梯孔 29的端面时, 回到初始位置, 电枢 21的前 端面亦回到磁隙 28的长度之内, 准备开始下一循环。
由于电枢油道 22的几何形状和回油件体 50的几何形状的关系, 以及足 够的回位弹簧力, 电枢 21的往复运动可以产生足够的回油净流量, 从而有效 地冷却本体并排除蒸汽以保证稳定的燃油喷射。
实施例 2: 如图 2所示, 本实施例运动装置的电枢 21包含一段锥形油 道 22c, 由于锥形油道 22c的存在, 使得电枢 21在往复运动中, 在回流方向 受到的流体阻力大于反向阻力, 从而促进回油方向流量差的产生。
电枢 21后端具有一个围绕中心电枢油道 22的凸台 23, 回油件 14设一 ' 个能避让凸台 23的阶梯孔 29,阶梯孔 29的深度和直径大于或者等于电枢 21 后端的凸台 23高度和直径。 当电枢 21 的回位运动接近回油件 14, 电枢 21 的后端面与回油件 14的端面趋于形成一个一定程度的封闭空间,此空间中的 流体受到限制, 燃油因此而受到挤压同时减缓了电枢 21回位对回油件 14的 冲击, 同时, 这种凸台一阶梯孔结构更有利于在回油方向产生流量差。
作为柱塞泵装置 30的进一步改进,在压力室 32和回油通路 15之间设一 个吸油单向阀 40, 其出口设在压力室 32的非滑动壁面, 其目的是减小柱塞 的回位运动阻力和进一步降低蒸汽进入压力室的可能性。吸油单向阀 40的入 口处设置过滤装置 44, 过滤装置可为普通滤网。
吸油单向阀 40包括阀体 41、 弹簧 43以及阀座 42, 其中, 阀体 41可以 是球体、 阀座 42可为轴对称曲面。
在加压阶段, 吸油单向阀 40关闭; 在吸油阶段的初始, 吸溢通道 33关 闭, 压力室 32内压力低, 吸油单向阀 40开启, 在回油通路 15的燃油通过开 启的吸油单向阀 40流入压力室 32, 柱塞 31继续上移至吸溢通道 33开启, 燃油同时经吸油单向阀 40和吸溢通道 33进入压力室 32。
压力室 32与回油通路 15之间还设有流量微调装置 80,流量微调装置 82 包括量孔 81和微调螺钉 82, 量孔 81连接压力室 32和回油通路 15, 通过微 调螺钉 82可以切断量孔 81或者改变通过量孔 81的燃油流量。设立流量微调 装置 80的目的在于提高流量的一致性。
此实施例中, 作为燃油喷出装置 90 的进一步改进, 在所述的雾化喷嘴 60之喷射方向的前方设有一个导流罩 63, 导流罩 63与阀杆 61和喷嘴体 62 之前端形成残余容积 63a, 可以根据供油单元的具体安装位置在导流罩 63上 开设一个或者多个燃油出口 64, 用于改变喷射的锥角和方向。
当油压对阀体 61所产生力的能够克服弹簧 65的预紧力时,阀体 61向残 余容积 63a方向运动, 喷嘴随之开启, 由导流罩 63上开设的至少一个的燃油 出口 64喷出。
其它同实施例 1。
实施例 3 : 如图 3所示本发明提供的供油单元在第三实施例, 运动装置 10还包括一个与电枢 21同步运动的回油驱动件 52,设置于回油件体 50和电 枢 21之间。 回油驱动件 52上开有与回油通路 15串联的动回油道 53, 动回 油道 53为一个入口较大的锥形通道, 即从回油方向流过动回油道 53的流量 系数大于反方向流动的流量系数。回油驱动件 52的侧面还开设有从动回油道 53通向滑动璧面的侧通道 18。
回油驱动件 52通过设于其前端的弹簧 36b实现与电枢 21的同步运动, 并且弹簧 36b有利于电枢 21 以产生流量差的方式往复运动。 回油驱动件 52 可以与电枢 21固接, 也可以为单独件与电枢 21靠紧, 它们可以同轴设置, 也可以非同轴设置。 电枢 211上可不设燃油通道, 也可以有多个或者一个电 枢油道 22d布设于电枢 21内,套筒 27筒体外侧与线圈 25之间开设有旁通燃 油通道 16, 在电枢两个端面附近的套筒 27筒体上开设有侧向燃油通道 17和 17a, 它们在轴向的长度分别覆盖电枢两个端面的运动范围, 以致于在任何吋 刻, 燃油都能够从回油通路 15通过侧向燃油通道 17a进入旁通燃油通道 16, 再从侧向燃油通道 17进入侧通道 18, 然后再进入动回油道 53。 这样, 回油 通路 15—侧向燃油通道 17a—旁通燃油通道 16—侧向燃油通道 17—侧通道 18 一动回油道 53构成一个始终保持连通的燃油通路, 有了这个燃油通路, 即便 没有电枢油道 22d, 或者电枢油道 22d的流通面积很小, 在回油驱动件 52和 电枢 21的往复运动的作用下, 也能够产生一个回油流动。
侧向燃油通道 17a的一部分会与磁隙 28在空间上重叠, 磁隙 28是由非 导磁材料制造, 例如黄铜等。
在回流驱动件 52和回油件 14之间, 仍然可以设置凸台一阶梯孔结构以 减小冲击和有利于产生回油方向.的流量差。在回油件 14上也可以设置锥形阶 梯状的整流段 51, 从而增强回油能力。
其它同实施例 1
实施例 4: 如图 4所示的第四实施例, 本实施例同实施例 3作为驱动装 置的改进实施例,在本实施例中电枢油道 22e为电枢 21筒体四周加工的纵向 孔或者沟槽。 电枢油道 22可以减轻电枢 21的重量以及电枢 21运动的阻力。 提高电枢 21运动的高速特性。 电枢油道 22e串联与回油通路 15中。 在本实施例中, 在回油件 14上设有一个朝向电枢的回油腔 54。 回油腔 54可以是一个简单的与回油道 12串联的孔,开口的尺寸与电枢油道 22e相匹 配, 其匹配原则是: 当电枢与回油件靠紧时, 仍然能够保持电枢油道 22e与 回油腔 54的连通, 即回油腔 54的开口与电枢油道 22e之间有一定的重合; 当电枢 21的回位运动接近回油件 14时, 电枢油道 22e的有效流通面积在减 小, 受到的流体阻力增大, 从而有利于产生回油方向的流量差。 回油方向流 量差的产生有利于排出体内的热量和蒸汽的排除。
其它同实施例 2
实施例 5: 如图 5所示的第五实施例, 本实施例的回油件 14包含一回油 道, 此回油道由油道 55和一个与之连通的环槽 56构成, 电枢 21设有电枢油 道 22, 并在电枢 21的后端面设有与电枢油道 22连通的侧孔 19。 当电枢 21 的回位运动接近回油件 14时, 环槽 56会被电枢 21的侧面部分覆盖, 当电枢 21后端面与回油件 14的端面靠紧时, 环槽 56只有通过侧孔 19与电枢油道 22连通, 在这个过程中, 电枢 21的回位运动使得电枢油道 22的有效流通面 积减小, 受到的流体阻力增大, 从而有利于增大回油量。
本实施例提供一种提高工作频率的结构,驱动装置 20包括一个工作线圈 25a和一个回位线圈 25以及磁隙 28a和回位磁隙 28, 工作线圈 25a和回位线 圈 25同轴设置, 它们分别由两个相互独立的 PWM控制, 产生一个交变的磁 场, 工作线圈 25a形成的磁回路驱动电枢 21正向运动, 回位线屬 25形成的 磁回路帮助所述的电枢 21回位, 此改进方案不仅能够加速电枢 21的回位速 度, 从而增大回油量, 而且可以使得该装置的工作频率提高。
其它同实施例 1
实施例 6: 如图 6所示的第六实施例, 与实施例 5不同的是在电枢油道 22与回油道 12之间设一单向阀 50, 单向阀 50包括阀体 58、 弹簧 591 以及 阀座 59构成, 其中, 阀体 50是球体、 阀座 59为轴对称曲面; 或者阀体 50 为平面薄片、 阀座 59为 " O"型圈。 单向阀 50的进口连通电枢油道 22, 出 口设在回油道 12上。
单向阀 50并联燃油通道 55, 从而保持油道 15始终保持通畅。 由于单向 阔 50的存在, 使得燃油通过回油道 12的流量系数在回油方向大于反方向, 从而产生促进回油流量。
其它同实施例 5
实施例 7: 如图 7所示的第七实施例, 作为实施例一之柱塞泵装置 30的 进一步改进, 在压力室 32和回油通路 15之间为吸油单向阀 40, 其出口设在 压力室 32的非滑动壁面,吸溢通道 33串联一个通向所述回油通路 15的单向 溢油阀 46, 出口设在回流通路 15。 吸油单向阀 40包括阀体 41、 弹簧 43 以 及阀座 42, 在其入口处可设燃油过滤装置 44。
溢油阀 46包括阀体 47、弹簧 149以及阀座 48, 如果阀体 47依靠重力能 够落座, 则弹簧 149可以省略。
在吸油的整个阶段, 吸溢通道 33被单向溢流阀 46关闭, 通向压力室 32 的燃油全部由吸油单向阀 40的供给, 阻断回油通路 15的燃油蒸汽, 更进一 步避免燃油蒸汽通过吸溢通道 33回流到压力室 32。
实施例 8: 如图 8所示的第八实施例, 为实施例一之柱塞泵装置 30更进 一步的改进, 本实施例中, 吸溢通道 33 通过单向溢油.阀 100通向回油通路 15, 吸油单向阀 110通过吸溢通道 33将回油通路 15与压力室 32连通, 吸油 单向阀 110的进油口设在回油通路 15上。
单向溢油阀 100包括阔体 102、 弹簧 101和阀座 103, 如果阀体 47依靠 重力能够落座,则弹簧 101可以省略。 吸油单向阀 110由阀体 111、弹簧 113 和阀座 112构成, 此单向阀为常规的单向阀结构。
在柱塞 31运动的初始阶段, 压力室 32部分燃油以及携夹的燃油蒸汽从 吸溢通道 33通过单向溢油阀 100排出到回油通路 15, 柱塞 31继续下行, 关 闭吸溢通道 33, 此时压力室 32中的燃油被加压, 等压力室 32内压力升至给 定压力时, 由燃油喷出装置 90喷出。
燃油线圈的通电结束后,柱塞 31在回位弹簧 36的作用下开始回位运动, 开始进行燃料的吸油行程, 此时, 燃油由进油通道 11 进入回流通路 15, 通 过吸油单向阀 110由吸溢通道 33进入压力室 32, 此时单向溢油阀 100关闭, 阻止了残留蒸汽被吸入压力室 32的可能。
此种结构有利于简化结构, 使集成式供油单元小型化。
其它同实施例 1。
实施例 9: 如图 9所示的本发明之集成式供油单元在发动机上的一个实 际应用举例。
燃油由油箱 6经过滤器 4a和燃油箱通道 241a以及过滤装置 4进入汽液 分离器 7之空腔 7a, 其中过滤装置 4为可选择件, 另一个可选择的通路是备 用油通路, 它是由备用过滤器 4b、 备用燃油箱通路 241b和燃油开关 9构成, 当燃油液面 6a低于过滤器 4a之入口时, 燃油幵关 9才打开, 备用油路才能 起作用。空腔 7a内的燃油经过进油管 3到达本发明之集成式供油单元 1的进 油件 13, 一部分燃油经过喷射装置 90喷入发动机 2的进气道 (或者气缸), 其余部分从回油件 14排出, 经过回油管 5回到汽液分离器 7之空腔 7a。
本发明之集成式供油单元 1 内的燃油蒸汽被回油流动带到汽液分离器 7 之空腔 7a中, 再通过排气管路 8将其中的燃油蒸汽排到油箱 6之液面 6a之 上, 排气管路 8的入口在空腔 7a之上方, 出口始终保持在液面 6a之上或者 附近。

Claims

权利要求书
1、一种集成式供油单元,其包括:一个提供往复运动的驱动装置(20) 和一个被驱动的柱塞泵装置 (30), 一个燃油喷出装置 (90), 一个进油件
(13), 一个回油件 (14), 从进油件 (13) 到回油件 (14) 有一条始终保 持畅通的回油通路 (15), 回油通路 (15) 中的部分燃油通过柱塞泵装置 (30) 的作用从燃油喷射装置 (90) 喷出, 其特征在于: 驱动装置包括线 圈 (25) 和套筒 (27) 以及一个在线圈 (25) 之磁场作用下在套筒 (27) 中做往复运动的运动装置(10),所述运动装置(10)在所述回流通路(15) 中以产生流量差的方式往复运动, 从而产生从进油件(13)到回油件(14) 的回油流动。
2、 如权利要求 1所述的集成式供油单元, 其特征在于: 所述运动装 置 (10)包括一个电枢(21)。
3、 如权利要求 2所述的集成式供油单元, 其特征在于: 电枢 (21) 设有电枢油道 (22), 所述电枢油道 (22) 串联于所述回油通路 (15)。
4、如权利要求 3所述的集成式供油单元,其特征在于: 电枢油道(22) 在回油方向的入口处 (22a) 的流通面积大于或者等于出口处 (22b) 的流 通面积。
5、如权利要求 4所述的集成式供油单元,其特征在于:电枢油道(22) 贯通电枢 (21).之中心。
6、 如权利要求 5所述的集成式供油单元, 其特征在于: 电枢 (21) 的前端面设有一个跨越动回油道入口的拱形传力件 (24), 从而使得电枢 (21) 在驱动柱塞泵装置 (30) 的同时不影响燃油的回油流动。
7、 如权利要求 6所述的集成式供油单元, 其特征在于: 电枢 (21) 在回油方向的回位运动由所述回油件(14) 限位, 在所述电枢的后端面设 有一个围绕电枢油道出口 (22b) 的凸台 (23), 在回油件 (14) 上设有一 个能够避让所述凸台 (23) 运动并且形状与之相匹配的阶梯孔 (29)。
8、 如权利要求 1所述的集成式供油单元, 其特征在于: 回油件(14) 设有一个与回油通路 (15) 串联的回油道 (12), 回油道 (12) 包含一个 整流段 (51), 燃油从两个方向通过整流段 (51) 时, 在回油流动方向具 有更大的流量系数。
9、 如权利要求 3所述的集成式供油单元, 其特征在于: 电枢油道设 置在电枢(21) 与套筒 (27) 之间。
10、如权利要求 2所述的集成式供油单元,其特征在于:运动装置(10) 还包括一个与电枢(21) 同步运动的回油驱动件(52), 回油驱动件(52) 设有与所述回油通路 (15) 串联的动回油道 (53), 回油驱动件 (52) 位 于回油件 (14) 和电枢 (21) 之间。
11、 如权利要求 1一 10之一所述的集成式供油单元, 其特征在于: 柱 塞泵装置(30)包括一个柱塞(31)和一个与柱塞相互配合压送燃油的压 力室 (32), 在压力室 (32) 和所述回油通路 (15) 之间设有一个吸溢通 道 (33), 柱塞 (31) 被所述运动装置 (10) 所驱动, 进行吸油 /压送的往 复运动,.柱塞吸油运动时,燃油通过吸溢通道(33)进入压力室,柱塞(31) 在压送运动的初期, 压力室(32)中的部分燃油或者燃油蒸汽通过吸溢通 道 (33) 排出, 当所述吸溢通道(33) 被柱塞 (31)运动关闭时, 则开始 对燃油进行有效压送。
12、 如权利要求 11 所述的集成式供油单元, 其特征在于: 在压力室 (32) 和回油通路 (15) 之间还设有一个吸油单向阀 (40), 柱塞 (31) 吸油运动时, 燃油先通过吸油单向阀 (40) 再通过吸溢通道 (33) 进入压 力室, 柱塞(31)在压送运动的初期, 压力室 (32) 中的部分燃油或者燃 油蒸汽通过吸溢通道 (33) 排出, 当吸溢通道 (33) 被柱塞运动关闭时, 则开始对燃油进行有效压送。
13、 如权利要求 12所述的集成式供油单元, 其特征在于: 吸溢通道 (33) 还串联一个通向所述回油通路 (15) 的单向溢油阀 (46), 燃油只 能通过所述吸油单向阀 (40) 进入压力室 (32)。
14、 如权利要求 11 所述的集成式供油单元, 其特征在于: 吸溢通道 (33) 通过一个单向溢油阀 (100)通向所述回油通路(15), 一个进油口 设在回油通路 (15) 的吸油单向阀 (110) 通过所述吸溢通道 (33) 连通 压力室 (32)。
15、 如权利要求 12所述的集成式供油单元, 其特征在于: 在压力室
(32)与回油通路(15)之间设有流量微调装置(80),流量微调装置(80) 包括量孔 (81) 和微调螺钉 (82), 量孔 (81) 连接压力室 (32) 和回油 通路 (15), 通过微调螺钉 (82) 可以切断或者改变通过量孔 (81) 的流 16、 如权利要求 12-15之一项所述的集成式供油单元, 其特征在于: 吸油单向阀 (40) 或者吸油单向阔 (110) 的入口处设有防止气泡或者燃 油杂质进入压力室的过滤装置 (44)。
17、 如权利要求 1一 16之一项所述的集成式供油单元, 其特征在于: 燃料喷射装置为燃料喷出口 (74)。
18、 如权利要求 1一 16之一项所述的集成式供油单元, 其特征在于: 燃料喷射装置包括出油阀 (70) 和雾化喷嘴 (60)。
19、如权利要求 18所述的集成式供油单元,其特征在于:出油阀(70) 由阀体 (71)、 阀座 (72) 及弹簧 (73) 组成, 其中阀体 (71) 是球体, 阀座 (72) 是轴对称曲面, 或者阀体(71) 是平面薄片, 阀座 (72) 是弹 性件。
20、 如权利要求 19所述的集成式供油单元, 其特征在于: 雾化喷嘴 (60) 由喷嘴体 (62), 阀杆 (61 ) 以及弹簧(65 ) 组成, 其中阀杆 (61 ) 的前端部 (69a) 的锥形体或者球形体形成阀体, 喷嘴体上的锥面 (69b) 形成阀座, 喷嘴体 (62) 上开有进油孔 (68); 阀杆 (61 ) 后端部设有弹 簧座 (66), 它与喷嘴体 (61 ) 之间的轴向间隙形成阔杆的最大升程。
21、 如权利要求 20所述的集成式供油单元, 其特征在于: 雾化喷嘴
(60) 还包括设在出口的导流罩 (63 ), 导流罩 (63 ) 设一个或者多个燃 油出口 (64)。
22、 如权利要求 20或 21所述的集成式供油单元, 其特征在于: 阀杆
(61 )开启时的最大流通面积与柱塞(31 )截面积之比限定在 0.025之内。
23、一种使用权利要求 1一 22之一项所述的集成式供油单元的内燃机, 燃油通过所述集成式供油单元喷入内燃机的进气道或汽缸。
PCT/CN2005/000970 2004-12-08 2005-07-04 Module integre d’alimentation en carburant WO2006060942A1 (fr)

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US11/660,408 US7377266B2 (en) 2004-12-08 2005-07-04 Integrated fuel feed apparatus
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