CN112096550A - Quick response type high-pressure ball control common rail oil injector - Google Patents
Quick response type high-pressure ball control common rail oil injector Download PDFInfo
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- CN112096550A CN112096550A CN202011045095.0A CN202011045095A CN112096550A CN 112096550 A CN112096550 A CN 112096550A CN 202011045095 A CN202011045095 A CN 202011045095A CN 112096550 A CN112096550 A CN 112096550A
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- oil
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- valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0632—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a spherically or partly spherically shaped armature, e.g. acting as valve body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
A quick response type high-pressure ball control common rail oil injector comprises an electromagnet component, an electromagnet spring, an armature rod, an armature, a damping spring, a ball seat, a sealing ball, a valve sleeve, a valve rod, an oil injector body, an oil nozzle spring, an oil nozzle needle valve body, an oil nozzle needle valve, an armature rod lower guide seat and a high-pressure sealing ring, wherein high-pressure oil enters the oil injector body from a main oil inlet channel and is isobaric and parallel-connected to form two control oil paths by adopting a parallel oil control principle, one oil path enters an upper high-pressure cavity formed by matching the valve sleeve and the valve rod from the upper high-pressure oil channel, the other path enters a lower high-pressure cavity from the lower high-pressure oil channel, the sealing ball and the sealing and closing or opening of a conical surface on the valve sleeve are controlled by the electromagnet component, so that the pressure maintaining or pressure reducing of the upper high-pressure cavity is realized through an oil outlet throttling hole, the stress state at, ideally overcoming the deficiencies of the prior art.
Description
The technical field is as follows:
the invention relates to an electric control common rail type oil sprayer for a diesel engine.
Background art:
the structure of the prior art fuel injector assembly is shown in fig. 1, and the prior art fuel injector assembly comprises an electromagnet component a21, an electromagnet spring a22, an armature rod a23, an armature a24, a hold-down screw 25, an upper armature seat 26, a lower armature seat 27, a fuel injector body a28, a fuel nozzle limit rod 29, a fuel nozzle spring 11, a transition block 11A, a fuel nozzle needle valve body 12, a fuel nozzle needle valve 13 and a transition plate 20, and the fuel injector assembly with the structure has the working principle that: high-pressure oil enters an oil injector assembly through an oil inlet channel of an oil injector body A28 and then enters an oil inlet channel on a lower armature seat 27, when an electromagnet component A21 is not electrified, a lower conical surface of an armature rod A23 is mechanically sealed with a conical surface on the upper top surface of the lower armature seat 27 under the action of the pretightening force of an electromagnet spring A22, the high-pressure oil cannot enter a high-pressure cavity of an oil nozzle matching part, an oil nozzle needle valve 13 is mechanically sealed with an oil nozzle needle valve body 12 under the action of the pretightening force of an oil nozzle spring 11, and the oil injector does not inject oil; when the electromagnet component A21 is electrified, due to the action of electromagnetic force, the armature A24 moves upwards to drive the armature rod A23 to move upwards, high-pressure oil enters the channel of the transition plate 20, then the oil outlet channel of the lower armature seat 27 and the oil outlet channel of the oil injector body A28 enter a high-pressure cavity of the oil nozzle matching part, and when the hydraulic pressure of the high-pressure cavity on the oil nozzle needle valve 13 overcomes the pretightening force of the oil nozzle spring 11, the oil nozzle needle valve 13 moves upwards to inject oil.
From the working principle of the fuel injector assembly with the existing structure, whether high-pressure oil enters a nozzle tip high-pressure cavity or not is controlled mainly through the up-and-down movement of an armature rod A23.
The main drawbacks of this solution are: firstly, the armature rod A23, the upper armature seat 26 and the lower armature seat 27 are sealed by conical surfaces, which puts high requirements on the manufacturing accuracy of the two conical surfaces arranged on the armature rod A23, the conical surfaces on the upper armature seat 26 and the lower armature seat 27 and the installation accuracy of the three conical surfaces, if the coaxiality of the two conical surfaces arranged above and below the armature rod A23 has errors, the sealing accuracy of two groups of conical surfaces is inevitably influenced, the sealing accuracy of two groups of conical surfaces is ensured at the same time, the processing accuracy of the armature rod A23, the upper armature seat 26 and the lower armature seat 27 and the installation accuracy among the two groups of conical surfaces are inevitably improved, the manufacturing difficulty is increased, the manufacturing cost is increased, and the qualification rate of products is not high. The accuracy and stability of conical surface sealing have great influence on the opening and closing of the injection;
secondly, conical surface sealing is arranged between the armature rod A23 and the lower armature seat 27, and after the conical surface sealing works for a long time, the conical surface sealing is easy to wear, so that the sealing performance is poor, the diameter of the conical surface sealing is changed, and the results of the leakage quantity deterioration and the injection characteristic change of the fuel injector assembly are caused.
And the armature rod A23 is matched with the upper armature seat 26 and the lower armature seat 27 by double coupling parts, so that the manufacturing cost is increased.
Because the high-pressure oil enters the oil nozzle after passing through the two conical surface seals between the armature rod A23 and the upper armature seat 26 and the lower armature seat 27, the opening and closing of oil injection have the delay phenomenon.
The conventional high-pressure common rail oil injector has the defects of delayed oil injection opening time and closing time, large oil injection pressure loss and low oil injection power density, and cannot meet the matching requirements of a high-efficiency energy-saving diesel engine, so the conventional high-pressure common rail oil injector needs to be improved and designed.
The invention content is as follows:
the invention aims to provide a quick response type high-pressure ball control common rail oil injector which can be immediately opened and closed in the injection process of the common rail oil injector, and the delay time of opening and closing is eliminated, so that the effect of reducing the injection duration is realized, and the aim of improving the power density is fulfilled.
The technical scheme adopted by the invention is as follows:
a quick response type high pressure ball accuse common rail sprayer, characterized by: the oil nozzle comprises an electromagnet component, an electromagnet spring, an armature rod, an armature, a damping spring, a ball seat, a sealing ball, a valve sleeve, a valve rod, an oil injector body, an oil nozzle spring, an oil nozzle needle valve body, an oil nozzle needle valve, an armature rod lower guide seat and a high-pressure sealing ring, wherein the electromagnet spring is placed between the end face of an inner concave hole of the electromagnet component and the armature rod, a coupling part is matched between an upper guide section of the armature rod and a central hole of the electromagnet component, and a coupling part is matched between a middle guide section of the armature rod and the armature rod; the lower guide section of the armature rod is matched with the lower guide seat of the armature rod through a coupling piece; the valve sleeve and the valve rod are matched by a matching part; the valve sleeve is provided with an oil outlet throttling hole, an oil inlet throttling hole, a conical surface, a lower end surface and a cylindrical surface, the oil outlet throttling hole and the conical surface are arranged at the center of the top of a shaft shoulder of the valve sleeve, and the oil outlet throttling hole is arranged at the bottom of the conical surface and communicated with the valve rod mounting hole; the oil inlet orifice sets up on the cooperation axle, and is located the top position of valve rod mounting hole, and oil inlet orifice and the flow ratio k of orifice under the same hydraulic pressure: 0.2< k < 1; a sealing structure is formed between the sealing ball and the conical surface; the oil sprayer is provided with a main oil inlet channel, an upper high-pressure oil channel, a lower high-pressure oil channel, a valve sleeve shaft shoulder hole and a central oil cavity, wherein the main oil inlet channel is communicated with the upper high-pressure oil channel and the lower high-pressure oil channel, the upper high-pressure oil channel is communicated with the central oil cavity, and the lower end surface of a valve sleeve is in mechanical sealing connection with the bottom surface of the valve sleeve shaft shoulder hole; the high-pressure sealing ring is arranged between the cylindrical surface of the valve sleeve and the central oil cavity of the oil injector body in a sealing manner; the damping spring is sleeved on the guide post of the armature and arranged in the concave tightening inner hole of the lower guide seat of the armature rod; a high-pressure cavity is formed at the top of the matched valve sleeve and valve rod, and a lower high-pressure cavity is formed after the matched oil nozzle needle valve body and oil nozzle needle valve; the large outer circle diameter d1 of the valve rod is larger than the large outer circle diameter d2 of the oil nozzle needle valve.
Furthermore, the armature comprises an adsorption disc, a guide post, a guide hole and weight reduction grooves, the adsorption disc, the guide post and the guide hole are coaxially arranged, the adsorption disc is arranged above the guide post, the guide hole is arranged at the center of the adsorption disc and the center of the guide post, the weight reduction grooves are arranged in equal intervals along the circumferential direction of the adsorption disc, and the guide hole is matched with the lower guide section of the armature rod through a matching piece.
Furthermore, the lightening grooves are arranged along the circumferential direction of the adsorption disc in equal parts and extend to the guide columns.
Furthermore, the oil injector body further comprises a valve sleeve matching hole, a valve rod hole, a pressure relief oil return hole and an oil outlet hole, the valve sleeve shaft shoulder hole, the central oil cavity, the valve sleeve matching hole and the valve rod hole are coaxially arranged from top to bottom, the upper end of the pressure relief oil return hole is arranged beside the inner side face of the valve sleeve shaft shoulder hole, the lower end of the pressure relief oil return hole is communicated with the valve rod hole, and the oil outlet hole is arranged on the side face of the oil injector body and is communicated with the valve rod hole.
Further, armature bar lower guide holder includes that the indent screws up hole, armature bar guiding hole, external screw thread, vertical pressure release hole, horizontal pressure release hole and post body, and the indent screws up hole, the coaxial setting of armature bar guiding hole on the central point of post body puts, and armature bar guiding hole is located the below of the indent screws up hole, and the external screw thread setting is on the outer circumference of the upper segment of post body, and vertical pressure release hole distributes in the outside of armature bar guiding hole along circumference, and horizontal pressure release hole sets up on post body hypomere side, and vertical pressure release hole communicates with each other with horizontal pressure release hole.
Furthermore, the lower ends of the vertical pressure relief holes are communicated with the conical surface at the top end of the valve sleeve.
Furthermore, the lower end surface of the lower guide seat of the armature rod is provided with a taper hole, the lower ends of the vertical pressure relief holes are communicated with the taper hole, and the taper hole corresponds to the conical surface at the top end of the valve sleeve.
Furthermore, the number of the vertical pressure relief holes is more than 3, and the vertical pressure relief holes are uniformly distributed along the circumferential direction.
The common rail fuel injector designed by the invention has the working process that:
the high-pressure fuel oil is divided into two paths from a main oil inlet channel of the oil injector body, one path enters an upper high-pressure cavity formed by the matching top surfaces of the valve sleeve and the valve rod from an upper high-pressure oil channel, and the other path enters a lower high-pressure cavity from a lower high-pressure oil channel.
When the electromagnet part is powered off, the sealing ball is pressed on the conical surface of the valve sleeve in a sealing mode under the action of the pretightening force of the electromagnet spring, the pressure relief channel of the oil outlet throttle hole is closed, the large round outer diameter d1 of the valve rod is larger than the large round outer diameter d2 of the oil nozzle needle valve, therefore, the downward hydraulic force F1 transmitted to the oil nozzle needle valve from the upper high-pressure cavity through the valve rod is achieved, the downward pretightening force F3 transmitted to the oil nozzle needle valve from the oil nozzle spring is achieved, and the relationship between the upward hydraulic force F2 applied to the oil nozzle needle valve from the lower high-pressure cavity is as: f1+ F3 is greater than F2, the nozzle needle valve is sealed on the seat surface of the nozzle needle valve body, and the oil injector does not inject oil;
when enough current is applied to the electromagnet part, the electromagnet part generates electromagnetic force action on the armature, when the electromagnet overcomes the pre-tightening force of the actuator spring, the armature moves upwards to drive the armature rod to move upwards, the sealing ball is not mechanically sealed on the conical surface of the valve sleeve, the pressure relief channel of the oil outlet orifice is opened, because the valve sleeve is provided with an oil inlet orifice and an oil outlet orifice, the flow ratio k of the oil inlet orifice and the oil outlet orifice is 0.2< k <1, the pressure of the upper high-pressure cavity is gradually reduced, the downward hydraulic pressure F1 transmitted to the oil nozzle needle valve by the upper high-pressure cavity through the valve rod is gradually reduced, when the downward hydraulic pressure F1 transmitted to the oil nozzle needle valve by the upper high-pressure cavity through the valve rod, the downward pre-tightening force F3 transmitted to the oil nozzle needle valve by the oil nozzle spring is F1+ F3 < F2 in relation with the upward hydraulic pressure F2 applied to the oil nozzle needle valve by the lower high, the nozzle needle valve moves upwards to leave the seat surface of the nozzle needle valve body, and the oil injector injects oil.
Because the invention adopts the parallel oil control principle, different from the serial control principle of the existing oil injector, high-pressure oil enters the oil injector body from the main oil inlet passage and then is isobaric and parallel-connected to be divided into two control oil passages, one oil passage enters an upper high-pressure cavity formed by the matching top surfaces of the valve sleeve and the valve rod from the upper high-pressure oil passage, and the electromagnet component controls the sealing ball and the sealing closing or opening of the conical surface on the valve sleeve, thereby realizing the pressure maintaining or pressure reduction of the upper high-pressure cavity through the oil outlet orifice, changing the stress state of the top of the valve rod and being the upper force source for controlling the opening and closing of the oil;
the other path enters the lower high-pressure cavity from the lower high-pressure oil passage and always generates an upward hydraulic driving force F2 to the nozzle needle valve, when enough current is applied to the electromagnet part, the electromagnet part generates electromagnetic force on the armature, when the electromagnet overcomes the pre-tightening force of the electromagnet spring, the armature moves upwards to drive the armature rod to move upwards, the sealing ball is not mechanically sealed on the conical surface of the valve sleeve, the pressure relief channel of the oil outlet orifice is opened, because the valve sleeve is provided with an oil inlet orifice and an oil outlet orifice, the flow ratio k of the oil inlet orifice and the oil outlet orifice is 0.2< k <1, the pressure of the upper high-pressure cavity is gradually reduced, the downward hydraulic force F1 transmitted to the nozzle needle valve by the valve rod of the upper high-pressure cavity is gradually reduced, when the downward hydraulic force F1 transmitted to the nozzle needle valve by the valve rod of the upper high-pressure cavity, the downward pre-tightening force F3 transmitted to the nozzle needle, when the relationship with the upward hydraulic pressure F2 applied by the lower high-pressure cavity to the oil nozzle needle valve is F1+ F3 < F2, the oil nozzle needle valve moves upwards to leave the seat surface of the oil nozzle needle valve body, high-pressure oil entering from the lower high-pressure oil passage directly sprays oil, and when the electromagnet part is de-energized, the sealing ball is sealed and pressed on the conical surface on the valve sleeve under the action of the pretightening force of the electromagnet spring; the oil is cut off immediately, the response efficiency of oil injection and oil cut-off is improved, and the defects of the prior art are overcome ideally.
The armature is subjected to weight reduction structural design, so that the attraction resistance of the electromagnet component to the armature can be reduced, and the service life of the armature is prolonged.
According to the working process and the working principle of the invention, the lower high-pressure oil duct is a direct oil supply channel after the nozzle needle valve is opened, while in the prior art, the high-pressure oil supply channel is arranged behind the armature rod, and the late phenomena of oil injection and oil cut exist, which directly affect the power output, the fuel consumption and the exhaust emission index of the diesel engine. The invention adopts the parallel oil control principle, and the upper high-pressure oil passage adopts spherical sealing, thus having long service life, high reliability, sensitive and broken oil injection and oil cut conversion, and light and sensitive armature suction and discharge.
Description of the drawings:
FIG. 1 is a schematic diagram of a prior art fuel injector;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of the structure of the injector body;
FIG. 4 is a schematic view of the construction of an armature rod;
FIG. 5 is a schematic view of the armature;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a schematic structural view of the lower guide base of the armature rod;
FIG. 8 is a top view of FIG. 7;
fig. 9 is a schematic view of the valve sleeve construction;
FIG. 10 is a schematic view of the valve sleeve in engagement with the valve stem;
in fig. 1: 20-a transition plate; 21-electromagnet part a; 22-electromagnet spring a; 23-armature bar a; 24-armature a; 25-a compression screw; 26-an upper armature seat; 27-lower armature seat; 28-injector body a; 29-a choke stop lever; 11A-a transition block; 11-a nipple spring; 12-glib needle valve body; 13-nozzle needle valve;
in fig. 2-10, 1-the electromagnet member; 2-electromagnet spring; 3-an armature rod; 4-an armature; 5-a damping spring; 6-ball seat; 7-a sealing ball; 8-valve sleeve; 9-a valve stem; 10-an injector body; 11-a nipple spring; 12-glib needle valve body; 13-nozzle needle valve; 14-an armature rod lower guide seat; 15-high pressure seal ring; 16-lower high pressure chamber; 31-a spring positioning section; 32-an upper guide section; 33-a middle guide section; 34-a lower guide section; 41-adsorption disc; 42-a guide post; 43-a pilot hole; 44-weight reduction slots; 80-valve sleeve shoulder; 81-oil outlet orifice; 82-an oil intake orifice; 83-a conical surface; 84-lower end face; 85-cylindrical surface; 86-upper high pressure chamber; 87-valve stem mounting hole; 101-a main oil inlet channel; 102-upper high pressure oil duct; 103-lower high pressure oil duct; 104-valve sleeve shaft shoulder hole; 105-a central oil chamber; 106-a valve housing mating bore; 107-valve stem bore; 108-pressure relief oil return hole; 109-oil outlet holes; 141-inner concave screwing inner hole; 142-armature rod guide holes; 143-external thread; 144-vertical pressure relief vent; 145-horizontal relief hole; 146-a pillar body; 147-taper hole.
The specific implementation mode is as follows:
the following description of the embodiments of the invention is provided by way of example in conjunction with the accompanying drawings:
example 1:
a quick response type high-pressure ball control common rail oil injector is shown in figures 2-10 and comprises an electromagnet component 1, an electromagnet spring 2, an armature rod 3, an armature 4, a damping spring 5, a ball seat 6, a sealing ball 7, a valve sleeve 8, a valve rod 9, an oil injector body 10, an oil nozzle spring 11, an oil nozzle needle valve body 12, an oil nozzle needle valve 13, an oil nozzle rod lower guide seat 14 and a high-pressure sealing ring 15, wherein the armature rod 3 comprises a spring positioning section 31, an upper guide section 32, a middle guide section 33 and a lower guide section 34, the spring positioning section 31, the upper guide section 32, the middle guide section 33 and the lower guide section 34 are coaxially distributed from top to bottom in sequence, the electromagnet spring 2 is placed between the end face of an inner concave hole of the electromagnet component 1 and the armature rod 3, the outer diameter of the spring positioning section 31 is in clearance fit with the inner diameter of the electromagnet spring 2, the outer diameter of the upper guide section 32 is in coupling fit with the central hole of the electromagnet component 1, the outer diameter of the middle guide section 33 is matched with the guide hole 43 of the armature 4 by a matching part, and the outer diameter of the lower guide section 34 is matched with the armature rod guide hole 142 of the armature rod lower guide seat 14 by a matching part; the valve sleeve 8 and the valve rod 9 are matched by a matching part; an oil outlet orifice 81, an oil inlet orifice 82, a conical surface 83, a lower end surface 84 and a cylindrical surface 85 are arranged on the valve sleeve 8, the oil outlet orifice 81 and the conical surface 83 are arranged at the center of the top of the valve sleeve shaft shoulder 80, and the oil outlet orifice 81 is arranged at the bottom of the conical surface 83 and communicated with the valve rod mounting hole 87; the oil inlet orifice 82 is arranged on the mating shaft and is positioned at the top of the valve rod mounting hole 87, and the flow ratio k of the oil inlet orifice 82 to the oil outlet orifice 81 under the same hydraulic pressure is: 0.2< k < 1; a sealing structure is formed between the sealing ball 7 and the conical surface 83; a main oil inlet channel 101, an upper high-pressure oil channel 102, a lower high-pressure oil channel 103, a valve sleeve shaft shoulder hole 104, a central oil cavity 105, a valve sleeve matching hole 106, a valve rod hole 107, a pressure relief oil return hole 108 and an oil outlet hole 109 are designed on the oil injector body 10, the main oil inlet channel 101 is communicated with the upper high-pressure oil channel 102 and the lower high-pressure oil channel 103, the valve sleeve shaft shoulder hole 104, the central oil cavity 105, the valve sleeve matching hole 106 and the valve rod hole 107 are coaxially arranged from top to bottom, the upper end of the pressure relief oil return hole 108 is arranged beside the inner side surface of the valve sleeve shaft shoulder hole 104, the lower end of the pressure relief oil return hole 108 is communicated with the valve rod hole 107, the oil outlet hole 109 is arranged on the side surface of the oil injector body 10 and communicated with the valve rod hole 107, the upper high-pressure oil channel 102 is communicated with the central oil cavity 105, and the lower end surface; the high-pressure sealing ring 15 is arranged between the cylindrical surface 85 of the valve sleeve 8 and the central oil cavity 105 of the oil injector body 10 in a sealing manner; the damping spring 5 is sleeved on the guide post 42 of the armature iron 4 and is arranged in an inward concave screwing inner hole 141 of the armature rod lower guide seat 14; an upper high-pressure cavity 86 is formed at the top of the matched valve sleeve 8 and valve rod 9, and a lower high-pressure cavity 16 is formed after the matched glib talker needle valve body 12 and glib talker needle valve 13; the large outer circle diameter d1 of the valve rod 9 is larger than the large outer circle diameter d2 of the oil nozzle needle valve 13;
the armature 4 comprises an adsorption disc 41, a guide post 42, a guide hole 43 and a weight reduction groove 44, wherein the adsorption disc 41, the guide post 42 and the guide hole 43 are coaxially arranged, the adsorption disc 41 is arranged above the guide post 42, the guide hole 43 is arranged at the center positions of the adsorption disc 41 and the guide post 42, the weight reduction grooves 44 are arranged at equal intervals along the circumferential direction of the adsorption disc 41, and the guide hole 43 is matched with the lower guide section 34 of the armature rod 3 through a coupling piece.
The armature rod lower guide seat 14 comprises an inner concave screwing inner hole 141, an armature rod guide hole 142, an external thread 143, a vertical pressure relief hole 144, a horizontal pressure relief hole 145 and a column body 146, wherein the inner concave screwing inner hole 141 and the armature rod guide hole 142 are coaxially arranged at the central position of the column body 146, the armature rod guide hole 142 is positioned below the inner concave screwing inner hole 141, the external thread 143 is arranged on the outer circumference of the upper section of the column body 146, the four vertical pressure relief holes 144 are circumferentially distributed on the outer side of the armature rod guide hole 142, the four horizontal pressure relief holes 145 are circumferentially and uniformly arranged on the side surface of the lower section of the column body 146, and the vertical pressure relief holes 144 are communicated with the horizontal pressure relief hole 145. The lower ends of the vertical pressure relief holes 144 are communicated with the conical surface 83 at the top end of the valve sleeve 8. The lower end surface of the armature rod lower guide seat 14 is provided with a taper hole 147, the lower ends of the vertical pressure relief holes 144 are communicated with the taper hole 147, and the taper hole 147 corresponds to the taper surface 83 at the top end of the valve sleeve 8.
The common rail fuel injector designed by the invention has the working process that:
the high-pressure fuel is divided into two paths from a main oil inlet channel 101 of the injector body 10, one path enters an upper pressure cavity 86 formed by the matching top surfaces of the valve sleeve 8 and the valve rod 9 from an upper pressure oil channel 102, and the other path enters a lower pressure cavity 16 from a lower pressure oil channel 103.
When the electromagnet component 1 is de-energized, the sealing ball 7 is pressed on the conical surface 83 of the valve sleeve 8 in a sealing way under the action of the pretightening force of the electromagnet spring 2, the pressure relief channel of the oil outlet orifice 81 is closed, because the major circle outer diameter d1 of the valve rod 9 is larger than the major circle outer diameter d2 of the oil nozzle needle valve 13, the downward hydraulic force F1 of the oil nozzle needle valve 13 is transmitted to the upper high pressure cavity 86 through the valve rod 9, the downward pretightening force F3 of the oil nozzle needle valve 13 is transmitted to the oil nozzle spring 11, and the relationship between the upward hydraulic force F2 applied to the oil nozzle needle valve 13 by the lower high pressure cavity 16 is as follows: f1+ F3 is greater than F2, the nozzle needle valve 13 is sealed on the seat surface of the nozzle needle valve body 12, and the oil injector does not inject oil;
when sufficient current is applied to the electromagnet component 1, the electromagnet component 1 generates electromagnetic force action on the armature 4, when the electromagnet overcomes the pre-tightening force of the electromagnet spring 2, the armature 4 moves upwards to drive the armature rod 3 to move upwards, the sealing ball 7 is not mechanically sealed on the conical surface 83 on the valve sleeve 8, the pressure relief channel of the oil outlet orifice 81 is opened, as the valve sleeve 8 is provided with the oil inlet orifice 82 and the oil outlet orifice 81, the flow ratio k of the oil inlet orifice 82 and the oil outlet orifice 81 is 0.2< k <1, the pressure of the upper high pressure chamber 86 is gradually reduced, the downward hydraulic pressure F1 of the upper high pressure chamber 86 transmitted to the nozzle needle valve 13 through the valve rod 9 is gradually reduced, when the downward hydraulic pressure F1 of the upper high pressure chamber 86 transmitted to the nozzle needle valve 13 through the valve rod 9, the downward pre-tightening force F3 of the nozzle needle valve 13 transmitted by the nozzle spring 11, and the upward hydraulic pressure F2 applied to the nozzle needle valve 13 by the lower high pressure chamber 16 are in the relationship of F1+ F3 + F2, the nozzle needle 13 moves upwards to leave the seat surface of the nozzle needle valve body 12, and the oil injector injects oil.
Example 2: the difference from the embodiment 1 is that: the lightening grooves 44 are equally spaced along the circumferential direction of the adsorption disk 41 and extend to the guide posts 42.
The embodiments of the present invention are not listed one by one, and all schemes of the present invention, which adopt the function replacement, etc., are within the protection scope of the present invention.
Claims (8)
1. A quick response type high pressure ball accuse common rail sprayer, characterized by: the oil nozzle comprises an electromagnet component (1), an electromagnet spring (2), an armature rod (3), an armature (4), a damping spring (5), a ball seat (6), a sealing ball (7), a valve sleeve (8), a valve rod (9), an oil injector body (10), an oil nozzle spring (11), an oil nozzle needle valve body (12), an oil nozzle needle valve (13), an armature rod lower guide seat (14) and a high-pressure sealing ring (15), wherein the electromagnet spring (2) is placed between the end face of an inner concave hole of the electromagnet component (1) and the armature rod (3), an upper guide section (32) of the armature rod (3) is matched with a central hole of the electromagnet component (1) through a coupling piece, and a middle guide section (33) of the armature rod (3) is matched with the armature (4) through a coupling piece; the lower guide section (34) of the armature rod (3) is matched with the lower guide seat (14) of the armature rod through a coupling piece; the valve sleeve (8) and the valve rod (9) are matched by a matching part; an oil outlet orifice (81), an oil inlet orifice (82), a conical surface (83), a lower end surface (84) and a cylindrical surface (85) are arranged on the valve sleeve (8), the oil outlet orifice (81) and the conical surface (83) are arranged at the center of the top of a valve sleeve shaft shoulder (80), and the oil outlet orifice (81) is arranged at the bottom of the conical surface (83) and communicated with a valve rod mounting hole (87); the oil inlet throttling hole (82) is arranged on the matching shaft and is positioned at the top of the valve rod mounting hole (87), and the flow ratio k of the oil inlet throttling hole (82) to the oil outlet throttling hole (81) under the same hydraulic pressure is as follows: 0.2< k < 1; a sealing structure is formed between the sealing ball (7) and the conical surface (83); a main oil inlet channel (101), an upper high-pressure oil channel (102), a lower high-pressure oil channel (103), a valve sleeve shaft shoulder hole (104) and a central oil cavity (105) are designed on an oil injector body (10), the main oil inlet channel (101) is communicated with the upper high-pressure oil channel (102) and the lower high-pressure oil channel (103), the upper high-pressure oil channel (102) is communicated with the central oil cavity (105), and the lower end surface (84) of a valve sleeve (8) is in mechanical sealing connection with the bottom surface of the valve sleeve shaft shoulder hole (104); the high-pressure sealing ring (15) is arranged between the cylindrical surface (85) of the valve sleeve (8) and the central oil cavity (105) of the oil injector body (10) in a sealing manner; the damping spring (5) is sleeved on the guide post (42) of the armature iron (4) and is arranged in the concave tightening inner hole (141) of the armature iron rod lower guide seat (14); an upper high-pressure cavity (86) is formed at the top of the matched valve sleeve (8) and valve rod (9), and a lower high-pressure cavity (16) is formed after the matched glib talker needle valve body (12) and glib talker needle valve (13); the large outer circle diameter d1 of the valve rod (9) is larger than the large outer circle diameter d2 of the oil nozzle needle valve (13).
2. The fast response type high pressure ball control common rail injector according to claim 1, characterized in that: the armature iron (4) comprises an adsorption disc (41), guide posts (42), guide holes (43) and weight reduction grooves (44), the adsorption disc (41), the guide posts (42) and the guide holes (43) are coaxially arranged, the adsorption disc (41) is arranged above the guide posts (42), the guide holes (43) are arranged at the central positions of the adsorption disc (41) and the guide posts (42), the weight reduction grooves (44) are arranged along the circumferential equal parts of the adsorption disc (41), and the guide holes (43) are matched with the lower sections (34) of the armature rod (3) through coupling parts.
3. The fast response type high pressure ball control common rail injector according to claim 2, characterized in that: the weight reduction grooves (44) are arranged along the circumferential direction of the adsorption disc (41) in equal parts and extend to the guide columns (42).
4. The fast response type high pressure ball control common rail injector according to claim 1, characterized in that: the oil injector body (10) further comprises a valve sleeve matching hole (106), a valve rod hole (107), a pressure relief oil return hole (108) and an oil outlet hole (109), the valve sleeve shaft shoulder hole (104), a central oil cavity (105), the valve sleeve matching hole (106) and the valve rod hole (107) are coaxially arranged from top to bottom, the upper end of the pressure relief oil return hole (108) is arranged beside the inner side face of the valve sleeve shaft shoulder hole (104), the lower end of the pressure relief oil return hole (108) is communicated with the valve rod hole (107), and the oil outlet hole (109) is arranged on the side face of the oil injector body (10) and is communicated with the valve rod hole (107).
5. The fast response type high pressure ball control common rail injector according to claim 1, characterized in that: the lower armature rod guide seat (14) comprises an inner concave screwing inner hole (141), an armature rod guide hole (142), an external thread (143), a vertical pressure relief hole (144), a horizontal pressure relief hole (145) and a column body (146), wherein the inner concave screwing inner hole (141) and the armature rod guide hole (142) are coaxially arranged at the central position of the column body (146), the armature rod guide hole (142) is positioned below the inner concave screwing inner hole (141), the external thread (143) is arranged on the outer circumference of the upper section of the column body (146), the vertical pressure relief hole (144) is circumferentially distributed at the outer side of the armature rod guide hole (142), the horizontal pressure relief hole (145) is arranged on the side face of the lower section of the column body (146), and the vertical pressure relief hole (144) is communicated with the horizontal pressure relief hole (145).
6. The fast response type high pressure ball control common rail injector according to claim 5, characterized in that: the lower ends of the vertical pressure relief holes (144) are communicated with a conical surface (83) at the top end of the valve sleeve (8).
7. The fast response type high pressure ball control common rail injector according to claim 5, characterized in that: the lower end surface of the armature rod lower guide seat (14) is provided with a taper hole (147), the lower ends of the vertical pressure relief holes (144) are communicated with the taper hole (147), and the taper hole (147) corresponds to a taper surface (83) at the top end of the valve sleeve (8).
8. The fast response type high pressure ball control common rail injector according to claim 5, characterized in that: the number of the vertical pressure relief holes (144) is more than 3, and the vertical pressure relief holes are uniformly distributed along the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011045095.0A CN112096550A (en) | 2020-09-29 | 2020-09-29 | Quick response type high-pressure ball control common rail oil injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011045095.0A CN112096550A (en) | 2020-09-29 | 2020-09-29 | Quick response type high-pressure ball control common rail oil injector |
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| Publication Number | Publication Date |
|---|---|
| CN112096550A true CN112096550A (en) | 2020-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011045095.0A Pending CN112096550A (en) | 2020-09-29 | 2020-09-29 | Quick response type high-pressure ball control common rail oil injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112096550A (en) |
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2020
- 2020-09-29 CN CN202011045095.0A patent/CN112096550A/en active Pending
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