CN101307741B - Engine fuel cylinder inner direct ejection device - Google Patents
Engine fuel cylinder inner direct ejection device Download PDFInfo
- Publication number
- CN101307741B CN101307741B CN2008100627402A CN200810062740A CN101307741B CN 101307741 B CN101307741 B CN 101307741B CN 2008100627402 A CN2008100627402 A CN 2008100627402A CN 200810062740 A CN200810062740 A CN 200810062740A CN 101307741 B CN101307741 B CN 101307741B
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- injector body
- spool
- needle
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 48
- 239000003921 oil Substances 0.000 claims description 117
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 239000000295 fuel oil Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 abstract description 22
- 239000007924 injection Substances 0.000 abstract description 22
- 239000007789 gas Substances 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 2
- 238000005461 lubrication Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000003915 liquefied petroleum gas Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a direct injection device in an engine fuel cylinder. The direct injection device comprises a backpressure control high-speed electromagnetic valve, a fuel control electromagnetic valve, an oil injector body and an oil injection nozzle; the backpressure control high-speed electromagnetic valve and the fuel control electromagnetic valve are arranged on the upper part of the oil injector body; and the oil injection nozzle is fixed on the lower part of the oil injection body. As the direct injection device is provided with a backpressure control device, the direct injection device can realize the rapid closing of a pin valve and improve the response characteristic of the pin valve, thereby realizing multisection injection and other flexible injection strategies; a backpressure control oil channel can adopt separate working oil with good lubrication and certain viscosity; therefore, the injection device can be used for injecting various gases and liquid fuels to the cylinder; when an engine is in a working stroke of no oil injection, the fuel control electromagnetic valve is closed in order that a pressure chamber exists no high-voltage fuel, thereby preventing the occurrence of the oil dripping phenomenon caused by poor seal, in particular preventing liquid gas fuel from being gasified in the pressure chamber caused by poor seal and ensuring the accuracy of oil injection metering.
Description
Technical field
The present invention relates to a kind of engine fuel cylinder inner direct ejection device, especially have the back pressure of injection control function, be mainly used in the internal-combustion engine liquid fuel inner cylinder direct injection system, purpose is in order to realize accurately oil spout control.
Background technique
In recent years; along with the aggravation of energy crisis and the increasingly stringent of Abgasgesetz; by with fuel; inject directly in the cylinder as gasoline, liquefied petroleum gas (LPG) (LPG) etc.; change traditional oil gas mixing mechanism and realize that thin even super lean combustion obtains higher fuel economy and emission level and other performance, become an important trend of current fuel of internal combustion engine spraying technique development.
The development of diesel electric-controlled common rail injection technology has reference function to the inner cylinder direct injection technology of other fuel.At present, diesel electric-controlled common-rail injector mainly is based on the oil sprayer of high-speed electromagnetic valve control, nozzle and traditional positive injector are similar with porous or pintaux noz(zle), high pressure fuel enters the pressure chamber of needle-valve lower end on the one hand by the high-pressure oil duct in injector body and the needle-valve body, be communicated to the control chamber of oil sprayer instruction piston head on the other hand under the control of solenoid valve.Though the type oil sprayer can be realized the back pressure of spraying and control, but because when motor is in not oil spout working stroke, there is fuel under high pressure in the pressure chamber of oil nozzle always, therefore when being used for low viscosity, low lubricated fuel, because sealing and lubricated bad, oil nozzle can produce certain oil dripping phenomenon, during in particular for liquid gas fuels such as liquefied petroleum gas (LPG), when sealing is bad, can causes vaporization, thereby influence the accuracy of oil spout metering.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of engine fuel cylinder inner direct ejection device is provided.
It comprises back pressure control high-speed electromagnetic valve, the fuel control electromagnetic valve, injector body, oil nozzle, back pressure control high-speed electromagnetic valve and fuel control electromagnetic valve are installed in the top of injector body, oil nozzle is fixed on the bottom of injector body, injector body comprises the working oil drainback passage, the working oil oil inlet passage, the injector body high-pressure oil duct, the fuel oil oil inlet passage, the return flow oil passage, back pressure cavity, injector body top is provided with double spool lock chamber and single spool lock chamber, the injector body bottom is provided with the needle-valve lock chamber, the injector body both sides are respectively equipped with the working oil drainback passage, working oil oil inlet passage and fuel oil oil inlet passage, the return flow oil passage, the injector body high-pressure oil duct communicates with the nozzle needle valve body high-pressure oil duct; Back pressure control high-speed electromagnetic valve comprises the first coil cover, first set screw nut, first fixed iron core, first electromagnetic coil, first spring seat, the first sunk screw group, first return spring, double spool, valve core, first fixed iron core is fixed on the injector body by first group of sunk screw, the first coil cover is fixed on first fixed iron core by first set screw nut, first spring seat is embedded in the injector body double spool lock chamber, first spool is provided with a boss in the double spool, first return spring is installed between first spring seat and the first spool boss, adopt between first spool and second spool in the double spool and be threaded, on valve core, be provided with first through hole, second through hole and third through-hole, first through hole communicates with the working oil drainback passage, second through hole communicates with the working oil oil inlet passage, third through-hole communicates with back pressure cavity by injector body working oil high-pressure oil duct, the fuel control electromagnetic valve comprises single spool, second return spring, second group of sunk screw, second spring seat, second electromagnetic coil, the second coil cover, second set screw nut, second fixed iron core, second fixed iron core is fixed on the injector body by the second sunk screw group, the second coil cover is fixed on second fixed iron core by second set screw nut, second spring seat is embedded in the single spool lock chamber of injector body, single spool is provided with a boss, second return spring is installed between second spring seat and the single spool boss, oil nozzle comprises pressure adjusting spring, needle-valve, needle-valve body, tightening nut, the pressure chamber, the needle-valve body high-pressure oil duct, needle-valve is provided with a boss, pressure adjusting spring is installed between the spring seat on this boss and the injector body, on needle-valve body, be provided with the needle-valve body high-pressure oil duct, nozzle needle valve body high-pressure oil duct and injector body high-pressure oil duct are connected, and fix by tightening nut between needle-valve body and the injector body.
Described double spool is fixed together by screw thread by first spool and second spool, and the surface of contact of first spool and second spool and valve core is a sphere, and the surface of contact of single spool and injector body is a sphere.
Described needle-valve and needle-valve body, needle-valve and injector body needle-valve lock chamber, valve core and injector body double spool lock chamber and single spool boss and injector body single spool lock chamber are respectively the even part of one group of precise finish.
The present invention has the following advantages:
1, has the back pressure control gear, can realize the quick closedown of needle-valve, improved the response characteristic of needle-valve, thereby can realize injection strategy flexibly such as multi-injection;
2, the back pressure control oil channel can adopt the working oil of independently lubricating well and having certain viscosity, thereby makes this injection apparatus can be used for the in-cylinder injection of multiple gases and liquid fuel;
When 3, motor is in not oil spout working stroke, close the fuel control electromagnetic valve, make the pressure chamber not have fuel under high pressure, thereby prevent because of sealing bad generation oil dripping phenomenon, especially can prevent liquid gas fuel in the pressure chamber because of sealing the bad vaporization that causes, thereby guarantee the accuracy of oil spout metering.
Description of drawings
Fig. 1 is the structural representation of engine fuel cylinder inner direct ejection device;
Fig. 2 is double spool of the present invention and valve core enlarged diagram;
Among the figure: first coil cover 1, first set screw nut 2, first fixed iron core 3, first electromagnetic coil 4, first spring seat 5, the first sunk screw group 6, first return spring 7, working oil drainback passage 8, double spool 9, first spool 10, second spool 11, working oil oil inlet passage 12, valve core 13, first through hole 14, second through hole 15, third through-hole 16, injector body 17, pressure adjusting spring 18, needle-valve 19, needle-valve body 20, tightening nut 21, pressure chamber 22, needle-valve body high-pressure oil duct 23, injector body high-pressure oil duct 24, injector body working oil high-pressure oil duct 25, single spool 26, fuel oil oil inlet passage 27, return flow oil passage 28, second return spring 29, second group of sunk screw 30, second spring seat 31, second electromagnetic coil 32, second coil cover 33, second set screw nut 34, second fixed iron core 35, back pressure cavity 36.
Embodiment
As Fig. 1, shown in 2, engine fuel cylinder inner direct ejection device comprises back pressure control high-speed electromagnetic valve, the fuel control electromagnetic valve, injector body, oil nozzle, back pressure control high-speed electromagnetic valve and fuel control electromagnetic valve are installed in the top of injector body, oil nozzle is fixed on the bottom of injector body, injector body 17 comprises working oil drainback passage 8, working oil oil inlet passage 12, injector body high-pressure oil duct 24, fuel oil oil inlet passage 27, return flow oil passage 28, back pressure cavity 36, injector body 17 tops are provided with double spool lock chamber and single spool lock chamber, injector body 17 bottoms are provided with the needle-valve lock chamber, injector body 17 both sides are respectively equipped with working oil drainback passage 8, working oil oil inlet passage 12 and fuel oil oil inlet passage 27, return flow oil passage 28, injector body high-pressure oil duct 24 communicates with nozzle needle valve body high-pressure oil duct 23; Back pressure control high-speed electromagnetic valve comprises first coil cover 1, first set screw nut 2, first fixed iron core 3, first electromagnetic coil 4, first spring seat 5, the first sunk screw group 6, first return spring 7, double spool 9, valve core, first fixed iron core 3 is fixed on the injector body 17 by first group of sunk screw 6, first coil cover 1 is fixed on first fixed iron core 3 by first set screw nut 2, first spring seat 5 is embedded in the injector body 17 double spool lock chambers, first spool 10 is provided with a boss in the double spool 9, first return spring 7 is installed between first spring seat 5 and first spool, 10 boss, adopt between first spool 10 and second spool 11 in the double spool 9 and be threaded, on valve core 13, be provided with first through hole 14, second through hole 15 and third through-hole 16, first through hole 14 communicates with working oil drainback passage 8, second through hole 15 communicates with working oil oil inlet passage 12, third through-hole 16 communicates with back pressure cavity 36 by injector body working oil high-pressure oil duct 25, the fuel control electromagnetic valve comprises single spool 26, second return spring 29, second group of sunk screw 30, second spring seat 31, second electromagnetic coil 32, second coil cover 33, second set screw nut 34, second fixed iron core 35, second fixed iron core 35 is fixed on the injector body 17 by the second sunk screw group 30, second coil cover 33 is fixed on second fixed iron core 35 by second set screw nut 34, second spring seat 31 is embedded in the single spool lock chamber of injector body 17, single spool 26 is provided with a boss, second return spring 29 is installed between second spring seat 31 and single spool 26 boss, oil nozzle comprises pressure adjusting spring 18, needle-valve 19, needle-valve body 20, tightening nut 21, pressure chamber 22, needle-valve body high-pressure oil duct 23, needle-valve 19 is provided with a boss, pressure adjusting spring 18 is installed between the spring seat on this boss and the injector body 17, on needle-valve body 20, be provided with needle-valve body high-pressure oil duct 23, nozzle needle valve body high-pressure oil duct 23 and injector body high-pressure oil duct 24 are connected, and be fixing by tightening nut 21 between needle-valve body 20 and the injector body 17.
Double spool 9 is fixed together by screw thread by first spool 10 and second spool 11, and first spool 10 and second spool 11 are sphere with the surface of contact of valve core 13, and single spool 26 is a sphere with the surface of contact of injector body 17.
Needle-valve 19 and needle-valve body 20, needle-valve 19 and injector body 17 needle-valve lock chambers, valve core 13 and injector body 17 double spool lock chambers and single spool 26 boss and injector body 17 single spool lock chambers are the even part of one group of precise finish respectively.
When the present invention works:
When the equal no electric circuit of first electromagnetic coil 4 and second electromagnetic coil 32, single spool 26 withstands on the valve seat under the effect of second return spring 29, cut off the connection of fuel oil oil inlet passage 27 and injector body high-pressure oil duct 24, there is not fuel under high pressure in the pressure chamber 22, meanwhile, double spool 9 is under the effect of first return spring 7, be pressed on downwards on the valve core 13, back pressure cavity 36 and working oil oil inlet passage 12 are communicated with, set up counterpressure in the back pressure cavity 36 this moment, needle-valve 12 is pressed on the valve seat of needle-valve body under the double action of pressure adjusting spring 18 and this counterpressure, and oil nozzle is closed not oil spout.
When the needs oil spout, under the control of controller, at first give second electromagnetic coil 32 energisings, single spool 26 is under the suction of second fixed iron core 35, the compressive force that overcomes second return spring 29 is lifted off a seat, fuel under high pressure is full of pressure chamber 22 rapidly, almost simultaneously, 4 energisings of first electromagnetic coil, the compressive force that double spool 9 overcomes first return spring 7 upwards is pressed on the valve core 13, back pressure cavity 36 and working oil drainback passage 8 are communicated with, because back pressure cavity 36 has been laid down the counterpressure that working oil produces, needle-valve 19 just overcomes pressure adjusting spring 18 under the pressure of pressure chamber's 22 fuel under high pressure that the pressure-bearing conical surface is subjected to active force leaves the valve seat on the needle-valve body 20, and the fuel in the pressure chamber 22 just sprays from nozzle; When fuel injection pulsewidth then, again under the control of controller, successively make first electromagnetic coil 4 and 32 outages of second electromagnetic coil, so double spool 9 is being pressed on downwards under the effect of first return spring 7 on the valve core 13, back pressure cavity 36 is communicated with working oil oil inlet passage 12 once more, set up counterpressure, though still exist fuel under high pressure in the pressure chamber 22 this moment, but because the compressive force sum of counterpressure that working oil forms in back pressure cavity 36 and pressure adjusting spring 18 is much larger than the pressure of fuel under high pressure at the needle-valve 19 bottom pressure-bearing conical surfaces, so needle-valve 19 can be taken a seat rapidly under the effect of pressure reduction up and down, oil nozzle stops oil spout, single spool 26 is pressed on the valve seat under the effect of second return spring 29 subsequently, cut off the connection of fuel oil oil inlet passage 27 and injector body high-pressure oil duct 24, pressure chamber 22 does not have fuel under high pressure, prevent that motor from sealing the bad oil dripping phenomenon that causes because of oil nozzle when being in not oil spout working stroke, especially can prevent that the gaseous fuel that liquefies from causing to a certain degree vaporization because of leakage in pressure chamber 22, thereby having guaranteed the accuracy of fuel injection quantity metering, more than is exactly the overall process of work of the present invention.
Claims (3)
1. engine fuel cylinder inner direct ejection device, it is characterized in that comprising back pressure control high-speed electromagnetic valve, the fuel control electromagnetic valve, injector body, oil nozzle, back pressure control high-speed electromagnetic valve and fuel control electromagnetic valve are installed in the top of injector body, oil nozzle is fixed on the bottom of injector body, injector body (17) comprises working oil drainback passage (8), working oil oil inlet passage (12), injector body high-pressure oil duct (24), fuel oil oil inlet passage (27), return flow oil passage (28), back pressure cavity (36), injector body (17) top is provided with double spool lock chamber and single spool lock chamber, injector body (17) bottom is provided with the needle-valve lock chamber, and injector body (17) both sides are respectively equipped with working oil drainback passage (8), working oil oil inlet passage (12) and fuel oil oil inlet passage (27), return flow oil passage (28); Back pressure control high-speed electromagnetic valve comprises the first coil cover (1), first set screw nut (2), first fixed iron core (3), first electromagnetic coil (4), first spring seat (5), the first sunk screw group (6), first return spring (7), double spool (9), valve core (13), first fixed iron core (3) is fixed on the injector body (17) by the first sunk screw group (6), the first coil cover (1) is fixed on first fixed iron core (3) by first set screw nut (2), first spring seat (5) is embedded in injector body (17) the double spool lock chamber, first spool (10) is provided with a boss in the double spool (9), first return spring (7) is installed between first spring seat (5) and first spool (10) boss, adopt between first spool (10) and second spool (11) in the double spool (9) and be threaded, on valve core (13), be provided with first through hole (14), second through hole (15) and third through-hole (16), first through hole (14) communicates with working oil drainback passage (8), second through hole (15) communicates with working oil oil inlet passage (12), third through-hole (16) communicates with back pressure cavity (36) by injector body working oil high-pressure oil duct (25), the fuel control electromagnetic valve comprises single spool (26), second return spring (29), the second sunk screw group (30), second spring seat (31), second electromagnetic coil (32), the second coil cover (33), second set screw nut (34), second fixed iron core (35), second fixed iron core (35) is fixed on the injector body (17) by the second sunk screw group (30), the second coil cover (33) is fixed on second fixed iron core (35) by second set screw nut (34), second spring seat (31) is embedded in the single spool lock chamber of injector body (17), single spool (26) is provided with a boss, second return spring (29) is installed between second spring seat (31) and single spool (26) boss, oil nozzle comprises pressure adjusting spring (18), needle-valve (19), needle-valve body (20), tightening nut (21), pressure chamber (22), needle-valve body high-pressure oil duct (23), needle-valve (19) is provided with a boss, pressure adjusting spring (18) is installed between the spring seat of this boss and injector body (17) bottom, on needle-valve body (20), be provided with nozzle needle valve body high-pressure oil duct (23), nozzle needle valve body high-pressure oil duct (23) and injector body high-pressure oil duct (24) are connected, and be fixing by tightening nut (21) between needle-valve body (20) and the injector body (17).
2. a kind of engine fuel cylinder inner direct ejection device according to claim 1, it is characterized in that: first spool (10) and second spool (11) are sphere with the surface of contact of valve core (13), and single spool (26) is a sphere with the surface of contact of injector body (17).
3. a kind of engine fuel cylinder inner direct ejection device according to claim 1 is characterized in that: needle-valve (19) and needle-valve body (20), needle-valve (19) and injector body (17) needle-valve lock chamber, valve core (13) and injector body (17) double spool lock chamber and single spool (26) boss and injector body (17) single spool lock chamber are respectively the even part of one group of precise finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100627402A CN101307741B (en) | 2008-07-01 | 2008-07-01 | Engine fuel cylinder inner direct ejection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100627402A CN101307741B (en) | 2008-07-01 | 2008-07-01 | Engine fuel cylinder inner direct ejection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101307741A CN101307741A (en) | 2008-11-19 |
| CN101307741B true CN101307741B (en) | 2010-06-16 |
Family
ID=40124355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100627402A Expired - Fee Related CN101307741B (en) | 2008-07-01 | 2008-07-01 | Engine fuel cylinder inner direct ejection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101307741B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168637A (en) * | 2011-05-25 | 2011-08-31 | 中国兵器工业集团第七○研究所 | Injector nozzle matching parts for diesel engine |
| CN104912707A (en) * | 2015-06-23 | 2015-09-16 | 哈尔滨工程大学 | Bivalve-cooperated electromagnetic control oil spray device |
| CN106401825B (en) * | 2016-12-09 | 2018-12-07 | 杭州电子科技大学 | Dual-coil electromagnetic valve controls diesel injector |
| CN109098907A (en) * | 2018-09-15 | 2018-12-28 | 天津盛欧美发动机技术有限公司 | Needle-free valve pre-compressed spring diesel injector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4033314A (en) * | 1975-08-08 | 1977-07-05 | Eaton Corporation | Metering control |
| US4526323A (en) * | 1981-05-20 | 1985-07-02 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines |
| CN2685678Y (en) * | 2004-03-26 | 2005-03-16 | 上海工程技术大学 | High-pressure self-balancing liquid fuel control valve |
-
2008
- 2008-07-01 CN CN2008100627402A patent/CN101307741B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4033314A (en) * | 1975-08-08 | 1977-07-05 | Eaton Corporation | Metering control |
| US4526323A (en) * | 1981-05-20 | 1985-07-02 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines |
| CN2685678Y (en) * | 2004-03-26 | 2005-03-16 | 上海工程技术大学 | High-pressure self-balancing liquid fuel control valve |
Non-Patent Citations (2)
| Title |
|---|
| JP昭57-198363A 1982.12.04 |
| JP昭60-162049A 1985.08.23 |
Also Published As
| Publication number | Publication date |
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| CN101307741A (en) | 2008-11-19 |
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Granted publication date: 20100616 Termination date: 20120701 |