CN107514329B - Double-oil inlet channel oil sprayer - Google Patents
Double-oil inlet channel oil sprayer Download PDFInfo
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- CN107514329B CN107514329B CN201710934418.3A CN201710934418A CN107514329B CN 107514329 B CN107514329 B CN 107514329B CN 201710934418 A CN201710934418 A CN 201710934418A CN 107514329 B CN107514329 B CN 107514329B
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- oil
- oil inlet
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- hole
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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
- F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3082—Control of electrical fuel pumps
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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
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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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
Abstract
The invention provides a double-oil-inlet-channel oil sprayer which comprises an oil sprayer body, a first oil inlet channel, a second oil inlet channel, an electromagnet, an armature rod, a ball seat, a control valve seat, a first spring, a ball valve, a throttle orifice plate, a control piston, a second spring, an ejector rod, a needle valve body, a transition block, a first oil inlet hole, a second oil inlet hole and an oil spray nozzle, wherein the first oil inlet channel is communicated with the second oil inlet channel; the oil sprayer body, the transition block and the needle valve body are assembled into a whole from top to bottom; the first oil inlet channel and the second oil inlet channel are positioned in the oil sprayer body, the transition block and the needle valve body, are communicated with an oil spraying hole channel of the oil sprayer downwards and are respectively communicated with the first oil inlet throttling hole and the second oil inlet throttling hole in the throttling hole plate upwards; the double-oil-inlet-channel oil sprayer can be suitable for a diesel engine fuel supply system with adjustable oil spraying speed which can be changed at any time, and can meet the spraying requirements of different pressures so as to improve the heat release rate of engine combustion and reduce emission.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to an oil injector of an electronic injection diesel engine.
Background
With the increasing exhaustion of petroleum resources and the increasing strictness of emission requirements, the reduction of oil consumption and emission becomes the main research direction of novel engine technology. In order to realize sufficient combustion, the atomization effect of fuel oil needs to be improved, and the increase of injection pressure becomes a main means. With the development of high-pressure common rail technology, the injection pressure is greatly improved. The injection pressure of a high-pressure common rail system provided by companies such as BOSCH and DENSO reaches more than 250 MPa. At such high injection pressures, the atomization effect of the fuel is greatly improved, and simply increasing the injection pressure causes the waste of engine power, which is not favorable for reducing the fuel consumption.
Research shows that the shape of the oil injection rate is optimized, so that the heat release rate of combustion of an engine can be improved, the fuel consumption is reduced, and the emission can be reduced. The flexible and variable oil injection rate is searched, the optimal matching is carried out according to the working condition of the engine, and the method has great potential in the aspects of reducing oil consumption and emission.
Disclosure of Invention
The invention aims to provide a double-oil-inlet-channel oil sprayer which can be suitable for a diesel engine fuel supply system with adjustable oil injection rate at any time, and can meet the injection of different pressures so as to improve the heat release rate of engine combustion and reduce the emission. The technical scheme adopted by the invention is as follows:
the double-oil-inlet-channel oil sprayer is applied to an improved diesel engine fuel supply system; the diesel engine fuel supply system comprises: the system comprises a fuel tank, a low-pressure oil pipe, a high-pressure oil pump, a high-pressure oil pipe, a high-pressure common rail pipe, a medium-low pressure common rail pipe, an electromagnetic switch valve, a double-oil-inlet-channel oil sprayer, a one-way valve with a throttling hole, an ECU (electronic control unit) and an electric control wiring harness;
the fuel tank is connected with the high-pressure oil pump through a low-pressure oil pipe; the high-pressure oil pump is respectively connected with the high-pressure common rail pipe and the medium-low pressure common rail pipe through a high-pressure oil pipe; the fuel oil is supplied to a high-pressure oil pump through a low-pressure oil pipe from a fuel tank, different pressures generated by the high-pressure oil pump are respectively supplied to a high-pressure common rail pipe and a medium-low pressure common rail pipe 8 through high-pressure oil pipes, and the fuel oil pressure in the high-pressure common rail pipe is greater than that in the medium-low pressure common rail pipe; the oil injector is provided with two oil inlet channels, wherein a high-pressure common rail pipe is connected with one oil inlet channel of the oil injector through an electromagnetic switch valve, and a medium-low pressure common rail pipe is connected with the other oil inlet channel of the oil injector through a one-way valve with a throttling hole; the ECU respectively controls the high-pressure oil pump, the high-pressure common rail pipe, the medium-low pressure common rail pipe, the electromagnetic switch valve and the oil injector to work through an electric control wire harness. When the injection starts, the fuel in the middle and low pressure common rail pipe flows into the fuel injector through the one-way valve, so that the middle and low pressure fuel injection is realized; in the injection process, the ECU controls the electromagnetic switch valve to be opened, high-pressure fuel in the high-pressure common rail pipe is filled into the fuel injector, and the one-way valve is pushed to be closed, so that high-pressure fuel injection is realized; after the injection is finished, residual high-pressure fuel oil in the oil injector leaks to the medium-low pressure common rail pipe through a throttling hole in the one-way valve, and the one-way valve is reset to prepare for the next injection.
The double-oil-inlet-channel oil injector comprises an oil injector body, a first oil inlet channel, a second oil inlet channel, an electromagnet, an armature iron, an armature rod, a ball seat, a control valve seat, a first spring, a ball valve, a throttle orifice plate, a control piston, a second spring, a mandril, a needle valve body, a transition block, a first oil inlet hole, a second oil inlet hole and an oil injection nozzle;
the oil sprayer body, the transition block and the needle valve body are assembled into a whole from top to bottom; the first oil inlet channel and the second oil inlet channel are positioned in the oil sprayer body, the transition block and the needle valve body, are communicated with an oil spraying hole channel of the oil sprayer downwards and are respectively communicated with the first oil inlet throttling hole and the second oil inlet throttling hole in the throttling hole plate upwards;
the oil injector body is provided with two oil inlets which are respectively used for connecting the one-way valve and the oil inlet joint, wherein the oil inlet joint is connected with the electromagnetic switch valve through an oil pipe; the two oil inlets are respectively communicated with a first oil inlet channel and a second oil inlet channel in the oil injector body through a first oil inlet hole and a second oil inlet hole which are arranged on the oil injector body;
the control piston is arranged in the middle of the oil sprayer body and can move up and down; a push rod is arranged below the control piston, and a needle valve is arranged below the push rod; the lower end of the needle valve extends into an oil injection pore channel of the oil nozzle; the second spring is sleeved on the ejector rod, the lower end of the second spring is abutted against the lower end head of the ejector rod, and the upper end of the second spring is abutted against an inner step arranged in the oil injector body;
the upper end of the oil sprayer body is provided with an upper cavity, and a throttle orifice plate and a control valve seat are assembled in the upper cavity from bottom to top;
a control cavity is arranged at the lower part of the middle of the throttle orifice plate and is positioned above the control piston; a first oil outlet throttling hole communicated with the control cavity is arranged above the control cavity in the throttling orifice plate, and a first oil inlet throttling hole and a second oil inlet throttling hole communicated with the control cavity are arranged on two sides of the throttling orifice plate; the first oil inlet throttling hole and the second oil inlet throttling hole are respectively communicated with the first oil inlet channel and the second oil inlet channel through connecting oil channels; a ball valve is arranged above a first oil outlet orifice of the orifice plate, and a ball seat is arranged above the ball valve;
an armature is arranged above the control valve seat, and the electromagnet is positioned above the armature; one end of the first spring is abutted against the control valve seat, and the other end of the first spring is abutted against the armature; the armature rod is positioned in the control valve seat and the armature and is connected with the armature, and the armature rod can move relative to the control valve seat; the lower end of the armature rod is propped against the ball seat.
Furthermore, oil containing grooves are arranged among the lower end of the first oil inlet channel, the lower end of the second oil inlet channel and an oil spraying hole channel of the oil spraying nozzle.
Furthermore, the oil sprayer body, the transition block and the needle valve body are assembled into a whole from top to bottom through the oil sprayer fastening cap.
Further, two oil inlets set up the left and right sides on the injector body respectively, and all set up to the top that inclines.
The invention has the advantages that:
1) the flexible and variable oil injection rule is realized, and two pressure sources, namely a relatively high pressure and a relatively low pressure, can be accessed; within a single injection duration, the switching of the two fuel pressures is realized.
2) Two oil paths of the double-oil-inlet-channel oil sprayer are respectively connected with a high-pressure common rail pipe and a medium-low-pressure common rail pipe, and pressure switching is realized at the end, close to an oil spray nozzle, in the oil sprayer. Compared with an external device for switching an oil way, the pressure switching device disclosed by the invention is closer to an oil nozzle, and can provide a faster response speed.
3) The double-oil-inlet-channel oil injector is connected with a check valve with a throttling hole in an oil inlet channel at one end of a medium-low pressure common rail pipe. The supply of medium-low pressure fuel oil and the blocking of high pressure fuel oil can be realized, and meanwhile, after the injection is finished, residual pressure oil in the oil sprayer can be discharged to prepare for the next injection.
Drawings
Fig. 1 is a schematic diagram of a fuel supply system of a diesel engine according to the present invention.
FIG. 2 is a schematic cross-sectional view of a dual inlet rail fuel injector of the present invention.
FIG. 3 is a partial cross-sectional view of a control chamber portion of a fuel injector of the present invention.
Fig. 4 is a block diagram of a check valve with an orifice in a fuel supply system according to the present invention.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
In order to realize flexible switching of two injection pressures in a single injection period, as shown in fig. 1, a fuel supply system of a diesel engine comprises a fuel tank 1, a low-pressure oil pipe 2, a high-pressure oil pump 3, a high-pressure oil pipe 4, a high-pressure common rail pipe 5, a medium-low pressure common rail pipe 8, an electromagnetic switch valve 6, a double-oil-inlet-pipe injector 7, a check valve 9 with a throttling hole, an ECU (electronic control unit) 10 and an electronic control wiring harness 11;
the fuel tank 1 is connected with a high-pressure oil pump 3 through a low-pressure oil pipe 2; the high-pressure oil pump 3 is respectively connected with a high-pressure common rail pipe 5 and a medium-low pressure common rail pipe 8 through a high-pressure oil pipe 4; the high-pressure oil pump 3 is an electric control multi-cylinder pump, fuel oil is supplied to the high-pressure oil pump 3 from the fuel tank 1 through a low-pressure oil pipe 2, and different pressures generated by the high-pressure oil pump 3 are respectively supplied to a high-pressure common rail pipe 5 and a medium-low pressure common rail pipe 8 through high-pressure oil pipes; the oil injector 7 is provided with two oil inlet channels, wherein the high-pressure common rail pipe 5 is connected with one oil inlet channel of the oil injector 7 through the electromagnetic switch valve 6, and the medium-low pressure common rail pipe 8 is connected with the other oil inlet channel of the oil injector 7 through the check valve 9 with a throttling hole; the ECU10 controls the high-pressure oil pump 3, the high-pressure common rail pipe 5, the medium-low pressure common rail pipe 8, the electromagnetic switch valve 6 and the oil injector 7 to work respectively through the electric control wiring harness 11;
the high-pressure oil pump 3 is an electric control multi-cylinder pump and can generate fuel oil with different pressures according to requirements; the ECU10 controls the high-pressure oil pump 3 to generate relatively low-pressure fuel oil which is introduced into the medium-low pressure common rail pipe 8; meanwhile, controlling to generate relatively high-pressure fuel oil, and introducing the fuel oil into the high-pressure common rail pipe 5; the fuel pressure in the high-pressure common rail pipe 5 is greater than the fuel pressure in the medium-low pressure common rail pipe 8; when the injection starts, the fuel in the medium and low pressure common rail pipe 8 flows into the fuel injector 7 through the one-way valve 9, so that the medium and low pressure fuel injection is realized; in the injection process, the ECU10 controls the electromagnetic switch valve 6 to be opened, high-pressure fuel in the high-pressure common rail pipe 5 is filled into the fuel injector 7, and the check valve 9 is pushed to be closed, so that high-pressure fuel injection is realized; after the injection is finished, the residual high-pressure fuel in the fuel injector 7 leaks to the medium-low pressure common rail pipe 8 through a throttling hole in the check valve 9, and the check valve 9 is reset to prepare for the next injection.
The double-oil-inlet-channel oil injector 7 can realize that the high-pressure common rail pipe 5 and the middle-low pressure common rail pipe 8 supply oil to the oil injector 7 in the same injection process. As shown in fig. 2, the dual oil inlet channel injector 7 includes an injector body 30, a first oil inlet channel 29, a second oil inlet channel 28, an electromagnet 27, an armature 26, an armature rod 25, a ball seat 24, a control valve seat 23, a first spring 231, a ball valve 22, a orifice plate 21, a control piston 20, a second spring 19, a plunger 18, a needle valve 17, a needle valve body 16, a transition block 15, a first oil inlet hole 14, a second oil inlet hole 13, and an injection nozzle;
the oil sprayer 30, the transition block 15 and the needle valve body 16 are assembled into a whole from top to bottom through an oil sprayer fastening cap 161; the first oil inlet channel 29 and the second oil inlet channel 28 are located in the oil injector body 30, the transition block 15 and the needle valve body 16, are both communicated with an oil injection hole channel of the oil injector downwards (the structure of the oil injector is the same as that of the prior art, so that the structure is omitted and not shown), and are respectively communicated with the first oil inlet throttling hole 31 and the second oil inlet throttling hole 32 in the throttling orifice plate 21 upwards;
the oil injector body 30 is provided with a left oil inlet and a right oil inlet which are respectively used for connecting the one-way valve 9 and the oil inlet joint 12, wherein the oil inlet joint 12 is connected with the electromagnetic switch valve 6 through an oil pipe; two oil inlets all set up to the oblique top.
The two oil inlets are respectively communicated with a first oil inlet channel 29 and a second oil inlet channel 28 in the oil injector body 30 through a first oil inlet hole 14 and a second oil inlet hole 13 arranged on the oil injector body 30;
the control piston 20 is arranged in the middle of the oil injector body 30 and can move up and down; the first oil inlet passage 29 and the second oil inlet passage 28 are located on both sides of the control piston 20, respectively; a mandril 18 is arranged below the control piston 20, and a needle valve 17 is arranged below the mandril 18; the lower end of the needle valve 17 extends into an oil injection pore channel of the oil nozzle; the second spring 19 is sleeved on the ejector rod 18, the lower end of the second spring is abutted against the lower end head of the ejector rod 18, and the upper end of the second spring is abutted against an inner step arranged in the oil injector body;
the upper end of the oil injector body 30 is provided with an upper cavity, and the throttle orifice 21 and the control valve seat 23 are assembled in the upper cavity from bottom to top;
as shown in fig. 3, a control chamber 201 is arranged at the lower middle part of the orifice plate 21, and the control chamber 201 is located above the control piston 20; a first oil outlet throttle hole 33 communicated with the control cavity 201 is arranged above the control cavity 201 in the throttle orifice plate 21, and a first oil inlet throttle hole 31 and a second oil inlet throttle hole 32 communicated with the control cavity 201 are arranged on two sides of the throttle orifice plate; the first oil inlet throttle hole 31 and the second oil inlet throttle hole 32 are respectively communicated with the first oil inlet passage 29 and the second oil inlet passage 28 through connecting oil passages; a ball valve 22 is arranged above the first oil outlet orifice 33 of the orifice plate 21, and a ball seat 24 is arranged above the ball valve 22;
an armature 26 is arranged above the control valve seat 23, and an electromagnet 27 is positioned above the armature 26; one end of the first spring 231 abuts against the control valve seat 23, and the other end abuts against the armature 26; an armature rod 25 is positioned in the control valve seat 23 and the armature 26 and connected with the armature 26, the armature rod 25 being displaceable relative to the control valve seat 23; the lower end of the armature rod 25 is abutted against the ball seat 24; the upper end of the armature rod 25 applies downward pretightening force through a pretightening force spring 251;
an oil containing groove 291 is arranged among the lower end of the first oil inlet channel 29, the lower end of the second oil inlet channel 28 and an oil spraying hole channel of the oil spraying nozzle;
under the condition that the electromagnet 27 is not electrified, fuel enters a first oil inlet channel 29 in the fuel injector 7 through the check valve 9 and the first oil inlet hole 14 and respectively flows to a pressure accumulation cavity (the pressure accumulation cavity mainly comprises two oil inlet channels 29 and 28, an oil containing groove 291 and a fuel injection hole channel of the fuel injection nozzle) and a control cavity 201 of the fuel injector 7; at this time, the orifice of the oil outlet orifice (i.e., the first oil outlet orifice 33) of the control chamber 201 is blocked by the ball valve 22, and the ball valve 22 is pushed down by the armature rod 25 and the ball seat 24; pressure oil is filled in the control cavity 201, the hydraulic pressure is transmitted to the oil nozzle needle valve 17 through the control piston 20 and the ejector rod 18, and the needle valve 17 is closed; after the electromagnet 27 is electrified, the armature 26 is attracted to move upwards by the electromagnetic force and drives the armature rod 25 to move, the ball valve 22 is opened, the pressure oil in the control cavity 201 is discharged, and the needle valve 17 is pushed by the pressure oil in the pressure accumulation cavity to move upwards and open to start oil injection;
after the needle valve 17 is opened, after a time controlled according to the requirement, the ECU10 controls the electromagnetic switch valve 6 to be opened, the high-pressure fuel enters the second oil inlet channel 28 through the oil inlet joint 12, and the high-pressure fuel starts to be sprayed under the condition that the needle valve 17 is opened; and the high-pressure fuel also enters the first oil inlet 29 and the first oil inlet 14 through the oil containing groove 291 and enters the one-way valve 9;
after the electromagnet 27 is powered off, the armature rod 25 moves downwards under the action of the spring force to push the ball seat 24, the ball valve 22 is closed, the pressure of the control cavity 201 is restored again, the needle valve 17 is closed under the action of hydraulic pressure, and the oil injection process is finished.
The check valve 9 with the throttling hole can enable fuel supplied by the medium-low pressure common rail pipe 8 to enter the fuel injector through the check valve 9 in the injection process, and after the electromagnetic switch valve 6 is opened, high-pressure fuel can be blocked by the check valve 9; after the injection is finished, the residual high-pressure fuel oil in the fuel injector 7 leaks to the medium-low pressure common rail pipe 8 through a throttling hole in the one-way valve 9, and the residual fuel oil in the fuel injector is ensured to be low-pressure oil when the next injection is started.
The check valve 9 is connected with a left oil inlet of the double-oil-inlet-channel oil sprayer 7 through threads; as shown in fig. 4, the check valve 9 includes a valve body 34, a valve core 35, a return spring 36, and a spring washer 37; the valve core 35 is assembled in the valve body 34, one end of the return spring 36 is propped against the outer peripheral step of the valve body 34, the other end of the return spring is propped against the spring gasket 37, and the spring gasket 37 is pressed on the end face of the inner cavity of the valve body 34; the valve core 35 and the valve body 34 are matching parts, and the first main oil gallery 38 and the second main oil gallery 41 are respectively positioned in the centers of the valve core 35 and the valve body 34; two oil inlet small holes 39 which are communicated with the first main oil duct 38 and the inner cavity of the valve body 34 are radially arranged on the valve core 35 close to the front end; a second oil outlet throttle hole 40 is arranged in the front end of the valve core 35; the front end of the valve core 35 and the inner cavity of the valve seat 34 are connected with the second main oil channel 41 to form oil channel sealing; the oil passage between the valve core 35 and the valve body 34 is sealed by a conical surface;
the initial state of the check valve 9 is open. In the starting stage of oil injection, fuel oil flows into the oil injector 7 from the second main oil passage 41 mainly through the small oil inlet hole 39 and the second main oil passage 38 to realize medium-low pressure injection; after the electromagnetic switch valve 6 is opened, high-pressure fuel oil flows back to the first oil inlet hole 14 through an oil passage in the oil injector 7, at the moment, hydraulic pressure acts on the end face of the valve core 35 to push the valve core 35 to move, the one-way valve 9 is closed to block medium and low pressure oil inlet, and high-pressure injection is realized; after the high-pressure injection is finished, the high-pressure fuel remained in the oil passage of the fuel injector 7 leaks to the medium and low pressure common rail pipe 8 through the second fuel outlet throttle hole 40 in the check valve 9, and the valve core 35 is restored to the open state under the action of the return spring 36.
Claims (4)
1. A double-oil-inlet-channel oil injector (7) is characterized by comprising an oil injector body (30), a first oil inlet channel (29), a second oil inlet channel (28), an electromagnet (27), an armature (26), an armature rod (25), a ball seat (24), a control valve seat (23), a first spring (231), a ball valve (22), a throttle orifice plate (21), a control piston (20), a second spring (19), a mandril (18), a needle valve (17), a needle valve body (16), a transition block (15), a first oil inlet hole (14), a second oil inlet hole (13) and an oil injection nozzle;
the oil injector body (30), the transition block (15) and the needle valve body (16) are assembled into a whole from top to bottom; the first oil inlet channel (29) and the second oil inlet channel (28) are positioned in the oil injector body (30), the transition block (15) and the needle valve body (16), are communicated with an oil injection hole channel of an oil injection nozzle downwards and are respectively communicated with a first oil inlet throttling hole (31) and a second oil inlet throttling hole (32) in the throttling orifice plate (21) upwards;
two oil inlets are arranged on the oil injector body (30); the two oil inlets are respectively communicated with a first oil inlet channel (29) and a second oil inlet channel (28) in the oil injector body (30) through a first oil inlet hole (14) and a second oil inlet hole (13) arranged on the oil injector body (30);
the control piston (20) is arranged in the middle of the oil injector body (30) and can move up and down; a push rod (18) is arranged below the control piston (20), and a needle valve (17) is arranged below the push rod (18); the lower end of the needle valve (17) extends into an oil injection pore channel of the oil injection nozzle; the second spring (19) is sleeved on the ejector rod (18), the lower end of the second spring is abutted against the lower end head of the ejector rod (18), and the upper end of the second spring is abutted against an inner step arranged in the oil injector body;
the upper end of the oil injector body (30) is provided with an upper cavity, and a throttle orifice plate (21) and a control valve seat (23) are assembled in the upper cavity from bottom to top;
a control cavity (201) is arranged at the lower part of the middle of the orifice plate (21), and the control cavity (201) is positioned above the control piston (20); a first oil outlet throttling hole (33) communicated with the control cavity (201) is arranged above the control cavity (201) in the throttling orifice plate (21), and a first oil inlet throttling hole (31) and a second oil inlet throttling hole (32) communicated with the control cavity (201) are arranged on two sides of the throttling orifice plate; the first oil inlet throttling hole (31) and the second oil inlet throttling hole (32) are respectively communicated with the first oil inlet channel (29) and the second oil inlet channel (28) through connecting oil channels; a ball valve (22) is arranged above a first oil outlet orifice (33) of the orifice plate (21), and a ball seat (24) is arranged above the ball valve (22);
an armature (26) is arranged above the control valve seat (23), and an electromagnet (27) is positioned above the armature 26; one end of the first spring (231) is abutted against the control valve seat (23), and the other end of the first spring is abutted against the armature (26); the armature rod (25) is positioned in the control valve seat (23) and the armature (26) and is connected with the armature (26), and the armature rod (25) can move relative to the control valve seat (23); the lower end of the armature rod (25) is propped against the ball seat (24); the upper end of the armature rod (25) applies downward pretightening force through a pretightening force spring (251);
an oil inlet on the oil injector body (30) is connected with a one-way valve (9), and the one-way valve (9) comprises a valve body (34), a valve core (35), a return spring (36) and a spring gasket (37); the valve core (35) is assembled in the valve body (34), one end of the return spring (36) is abutted against the peripheral step of the valve core (35), the other end of the return spring is abutted against the spring gasket (37), and the spring gasket (37) is pressed on the end face of the cavity in the valve body (34); the valve core (35) and the valve body (34) are matching parts, and the first main oil gallery (38) and the second main oil gallery (41) are respectively positioned at the centers of the valve core (35) and the valve body (34); an oil inlet small hole (39) which is communicated with the first main oil duct (38) and the inner cavity of the valve body (34) is radially arranged on the valve core (35) close to the front end head; a second oil outlet throttling hole (40) is formed in the front end of the valve core 35; the front end of the valve core (35) and the inner cavity of the valve seat (34) are connected with the second main oil channel (41) to form oil channel sealing.
2. The dual oil feed injector (7) according to claim 1,
an oil containing groove (291) is arranged among the lower end of the first oil inlet channel (29), the lower end of the second oil inlet channel (28) and an oil spraying hole channel of the oil spraying nozzle.
3. The dual oil feed injector (7) according to claim 1,
the oil sprayer body (30), the transition block (15) and the needle valve body (16) are assembled into a whole from top to bottom through an oil sprayer fastening cap (161).
4. The dual oil feed injector (7) according to claim 1,
the two oil inlets are respectively arranged on the left side and the right side of the oil injector body (30) and are arranged obliquely upwards.
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| CN107514329B true CN107514329B (en) | 2020-06-16 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108869131B (en) * | 2018-07-25 | 2023-08-29 | 中国人民解放军海军工程大学 | Supercharger and ultrahigh-pressure common rail system comprising same |
| CN110307110B (en) * | 2019-06-26 | 2021-07-23 | 河南美力达汽车有限公司 | Main and auxiliary integrated nonlinear correction oil sprayer |
| CN111120171B (en) * | 2019-12-06 | 2021-08-10 | 一汽解放汽车有限公司 | Fuel injection valve assembly |
| CN111120168B (en) * | 2020-04-01 | 2020-07-03 | 潍柴重机股份有限公司 | Supercharged electric control oil injector with variable oil injection law |
| CN114517752B (en) * | 2022-02-16 | 2023-04-11 | 一汽解放汽车有限公司 | Switch valve and oil supply system |
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| US6192862B1 (en) * | 1998-11-19 | 2001-02-27 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Accumulator type fuel injection system |
| DE10257691A1 (en) * | 2002-12-10 | 2004-06-24 | Siemens Ag | Fuel injector for internal combustion engine, has fuel supply line which branches into two feed lines between inlet and valve seat to reduce pressure fluctuations |
| CN105952559A (en) * | 2016-05-23 | 2016-09-21 | 中国第汽车股份有限公司无锡油泵油嘴研究所 | Double-oil-circuit electronic-controlled oil injector |
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| CN107514329A (en) | 2017-12-26 |
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