CN104265533A - Novel common rail oil injector - Google Patents
Novel common rail oil injector Download PDFInfo
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- CN104265533A CN104265533A CN201410375264.5A CN201410375264A CN104265533A CN 104265533 A CN104265533 A CN 104265533A CN 201410375264 A CN201410375264 A CN 201410375264A CN 104265533 A CN104265533 A CN 104265533A
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- oil
- spool
- oil pocket
- valve core
- orifice plate
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Abstract
The invention discloses a novel common rail oil injector. The novel common rail oil injector comprises a control valve consisting of a control piston, an oil injector body, a sliding valve core and a ball valve, wherein a top oil cavity connected with the ball valve is formed in the top of the sliding valve core; a valve core spring is arranged in the top oil cavity for pressing against the top of the sliding valve core; a middle oil cavity is formed in the middle periphery of the sliding valve core, and is communicated with the top oil cavity through a throttle hole; a lower oil cavity communicated with a high-pressure oil inlet way is formed in the lower periphery of the sliding valve core; a bottom oil cavity communicated with a top control cavity of the control piston is formed in the bottom of the sliding valve core; the control cavity is communicated with the middle oil cavity through an oil way; a boss is arranged in the lower oil cavity of the sliding valve core; and the upper surface of the boss fits the top surface of the lower oil cavity to form a sealing ring belt to control the communication between the lower oil cavity and the middle oil cavity. The novel common rail oil injector controls the pressure of the control cavity through the sliding valve core to control the oil injecting process, so that the large reduction of dynamic oil return of the oil injector is realized, and the oil injecting efficiency of the oil injector is improved.
Description
Technical field
The invention belongs to internal-combustion engine injection system field, relate to a kind of New Common Rail oil sprayer specifically.
Background technique
In order to meet the Abgasgesetz of increasingly stringent, the jet pressure of oil-fired system is more and more higher.Current most common-rail injector defines a control chamber in control piston upper end, and this control chamber has a meter in hole and a fuel-displaced throttle orifice.Meter in hole is connected with high-pressure oil duct, fuel-displaced throttle orifice is connected with low pressure oil way by solenoid valve, from its working principle, oil sprayer is rising by controlling the fuel pressure in control chamber or decline, thus the control piston controlling fuel oil injector by pressure difference moving up and down vertically.Similar oil sprayer is as disclosed CN1773098A, CN101548092A, CN102282354A, CN 101676548A patent.
Obviously, in oil sprayer injection process, being all in opening state into and out of oily throttle orifice, having a considerable amount of fuel oil through flowing back to fuel tank into and out of oily throttle orifice.This part fuel oil (dynamic oil return) has very high pressure, and energy becomes heat completely.Along with the raising of jet pressure, the dynamic oil return of control chamber is also increasing.The dynamic recirculating oil quantity of oil sprayer increases, and will increase the energy ezpenditure of oil feed pump, reduces the Economy of oil-fired system.In order to accelerate the speed that oil spout later stage needle-valve is taken a seat, often strengthened in meter in hole, simultaneously for ensureing the normal work of oil sprayer, fuel-displaced throttle orifice also can correspondingly strengthen.More high pressure fuel leak will be had in low pressure oil way, add energy loss, also limit the raising of fuel-injection pressure, and cause oil sprayer mesolow oil circuit temperature higher, and then affect stability, the reliability of oil sprayer work.
Summary of the invention
The object of the invention is that providing a kind of controls control chamber pressure by sliding valve core, thus controls the oil sprayer of injection process, achieves and significantly reduces the dynamic oil return of oil sprayer, improve oil sprayer oil spout efficiency.
The present invention for achieving the above object, adopts following technological scheme:
A kind of New Common Rail oil sprayer, comprises oil injector body, control piston, it is characterized in that: the control valve above described control piston with a sliding valve core and ball valve composition;
Described sliding valve core top has the top oil pocket be connected with ball valve, is provided with valve core spring and is pressed on described sliding valve core top in the oil pocket of top;
In the middle part of described sliding valve core circumference have one in the middle part of oil pocket, communicated with top oil pocket by throttle orifice;
Described sliding valve core bottom circumference has a bottom oil pocket communicated with high pressure oil input channel;
There is bottom described sliding valve core the bottom oil pocket communicated with control piston top control chamber;
Described control chamber is communicated with middle part oil pocket by an oil duct;
Have a boss in the oil pocket of described sliding valve core bottom, described boss upper surface and bottom oil pocket end face match and form seal band and control bottom oil pocket and communicate with middle part oil pocket.
It is further characterized in that: be provided with orifice plate A and orifice plate B above described oil injector body; Described sliding valve core is formed by connecting by spool C, spool D and attachment portion;
Described orifice plate A, between orifice plate B and oil injector body, described bottom oil pocket is positioned on orifice plate A, and in the middle part of oil pocket top, bottom Ju Nei conocave plane H and spool C, boss plane coordinates formation seal band, and the bottom oil pocket on orifice plate A is connected with oil sprayer filler opening by high-pressure oil duct;
Described orifice plate B inside has the different top oil pocket of diameter and middle part oil pocket, and top and spool D coordinate formation top oil pocket, and spool D is directed at top oil pocket inwall; The section area of middle part oil pocket is greater than top oil pocket, is also provided with spill port and sealing cone at orifice plate B top;
Be provided with throttle orifice in described spool D and connect top oil pocket and middle part oil pocket, and communicated with control chamber by the oil duct be interconnected in orifice plate A, orifice plate B, oil injector body.
Further: in described spool D, orifice diameter is 0.1 ~ 0.4mm.
Be provided with the attachment hole be connected with throttle orifice in described spool D, connect middle part oil pocket and throttle orifice.
Described spool C top and spool D bottom end face are provided with concave spherical surface, coordinate concave spherical surface and be fixedly connected with spool C and spool D with snap ring by steel ball.
In the middle part of oil pocket top, the bottom Ju Nei conocave plane H of described orifice plate A and spool C, boss plane coordinates formation seal band width to be 0.1 ~ 0.5mm.
In the middle part of oil pocket top, the bottom tool indent conical surface of described orifice plate A and spool C, boss cone match forms sealing.
The stroke of above-mentioned sliding valve core is 0.03 ~ 0.12mm.
Diameter bottom described spool C is greater than boss diameter in the middle part of spool C.
Good effect of the present invention is:
The present invention discloses a kind of common-rail injector, adds the control valve of sliding valve core and ball valve composition.When ball valve is taken a seat, close oil outlet, because the diameter bottom spool C is greater than boss diameter in the middle part of spool C, such bottom oil pocket intermediate fuel oil will be downwards to the hydraulic coupling of spool C, sliding valve core is under valve core spring and spool C are subject to the effect of downward hydraulic coupling, move downward the passage opened in the middle part of spool C in boss and orifice plate A between the H of conocave plane, oil duct ramp metering piston head control chamber in the oil pocket of high pressure fuel outside spool C, orifice plate A, B and oil injector body, control chamber pressure raises, needle-valve is taken a seat, not oil spout.When ball valve is opened, high pressure fuel flows into low pressure oil duct by spill port.Spool D top is provided with throttle orifice, spool D top oil pocket fuel pressure will be less than the pressure of oil pocket bottom spool C, at this moment spool is subject to the effect of upwards hydraulic coupling and overcomes spring force and move upward, and closes the passage in boss and orifice plate A between the H of conocave plane in the middle part of spool C.High pressure fuel in control chamber flows into low pressure oil way by by the oil duct in oil injector body, orifice plate A, B and spool D top throttle orifice.At this moment, control chamber pressure reduces, and control piston moves upward, oil sprayer commencement of fuel injection.This oil sprayer only when guiding valve moves upward the passage of cutting out in the middle part of spool C in boss and orifice plate A between the H of conocave plane, just there will be the phenomenon of high low pressure oil circuit communication, and this process is very short.In the middle part of spool C, boss and conocave plane H in orifice plate A are once contact, and the passage that high pressure fuel enters control chamber will be cut off, and will no longer include the waste of high pressure fuel.And the throttle orifice in draining road and the oil input channel of control chamber are independently, the throttle orifice flow area in draining road can be selected a little bit smaller, to increase the opening speed of needle-valve; And that the oil input channel flow area of control chamber can be selected is very large, realize taking a seat fast of needle-valve.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is guiding valve partial schematic diagram when opening.
Fig. 3 is conical surface seal zonary structure schematic diagram.
In figure: 1-control piston; 2-control chamber; 3-oil injector body; 4-filler opening; 5-oil duct G; Oil pocket bottom 6-; Bottom 7-spool C; 8-spool C; Boss in the middle part of 9-; 10-orifice plate A; 11-plane H; 12-oil duct K; 13-connects steel ball; 14-snap ring; Oil pocket in the middle part of 15-; 16-spool D; 17-orifice plate B; 18-throttle orifice; 19-top oil pocket; 20-valve core spring; 21-spill port; 22-ball valve; 24-bottom oil pocket; 25-attachment hole; The 26-indent conical surface.
Embodiment
A kind of New Common Rail oil sprayer of the present invention control chamber can with reference to the description of accompanying drawing 1,2.
The sliding valve core that the control piston 1 of oil sprayer, oil injector body 3, orifice plate A 10, orifice plate B 17, spool C 8 and spool D 16 form, ball valve 22 constitute control valve.Control chamber 2 only has an oil duct to be connected with high-pressure oil passage, low pressure oil way, and this oil duct is oil input channel and its oil road of control chamber 2, and does not arrange throttle orifice.Oil injector body 3 top control chamber 2 has two oil ducts, article one, oil duct is connected with high-pressure oil passage, low pressure oil way, another oil duct G 5 is connected with the bottom oil pocket 6 of spool C 8, prevent from valve core movement, occur oil resistance, and 7 to be directed at bottom oil pocket 6 inwall bottom spool C, form sealing, therefore oil pocket 6 intermediate fuel oil pressure in bottom is identical with control chamber 2 simultaneously.Orifice plate A 10, between orifice plate B 17 and oil injector body 3, orifice plate A 10 is provided with an oil duct K 12 be connected with control chamber 2 by the oil duct on oil injector body 3, and boss 9 plane coordinates formation seal band in the middle part of the bottom oil pocket 24 top Ju Nei conocave plane H 11 of orifice plate A 10 and spool C 8, described hole seal band width is 0.1 ~ 0.5mm.In the middle part of the top tool indent conical surface 26 of the bottom oil pocket 24 of orifice plate A 10 described in another embodiment and spool C 9, boss 9 cone match forms sealing as shown in Figure 3.The bottom oil pocket 24 of orifice plate A 10 is connected with high-pressure oil duct.Orifice plate B 17 inside has two different oil pockets of diameter, top and spool D 16 coordinate formation top oil pocket 19, spool D 16 is directed at top oil pocket 19 inwall, the middle part oil pocket 15 of orifice plate B 17 is provided with an oil duct and is connected with control chamber 2 by the oil duct on orifice plate A 10 and oil injector body 3, is also provided with spill port 21 and sealing cone at orifice plate B 17 top.Described sliding valve core is made up of spool C 8, spool D 16 and valve core chamber attachment portion, and spool C 8 top and spool D 16 bottom end face are provided with concave spherical surface, coordinates concave spherical surface by connecting steel ball 13 and is fixedly connected with spool C 8 and spool D 16 with snap ring 14.The stroke of described sliding valve core is 0.03 ~ 0.12mm.
When ball valve 22 is taken a seat, close spill port 21, diameter bottom spool C 8 is greater than boss 9 diameter in the middle part of spool C, valve core spring 20 is provided with in top oil pocket 19, one end acts on top oil pocket 19 end face, one end acts on spool D 16 top, sliding valve core is under valve core spring 20 and spool C 8 are subject to the effect of downward hydraulic coupling, move downward open spool C 8 middle part boss 9 and orifice plate A 10 in passage between conocave plane H 11, the middle part oil pocket 15 of high pressure fuel outside guiding valve and oil injector body 3, orifice plate A 10, the control chamber 2 at oil duct ramp metering piston 1 top in orifice plate B 17, control chamber 2 pressure raises, needle-valve is taken a seat, not oil spout.
Spool D 16 top is provided with throttle orifice 18, and in described spool D 16, throttle orifice 18 diameter is 0.1 ~ 0.4mm, is provided with the attachment hole 25 be connected with throttle orifice 18 simultaneously, connects middle part oil pocket 15 and throttle orifice 18 in spool D 16.When ball valve 22 is opened, high pressure fuel flows into low pressure oil way by spill port 21.The fuel pressure of spool D 16 top oil pocket 19 will be less than the pressure of the bottom oil pocket 6 of spool C 8, at this moment spool is subject to the effect of upwards hydraulic coupling and overcomes spring force and move upward, and closes the passage between the middle part boss 9 of spool C 8 and the interior conocave plane H 11 of orifice plate A 10.High pressure fuel in control chamber 2 will flow into low pressure oil way by fuel gallery and spool D 16 top throttle orifice 18.At this moment, control chamber 2 pressure reduces, and control piston 1 moves upward, oil sprayer commencement of fuel injection.
This oil sprayer only sliding valve core move upward close spool C 8 middle part boss 9 and orifice plate A 10 in passage between conocave plane H 11 time, just there will be the phenomenon of high low pressure oil circuit communication, and this process is very short.The middle part boss 9 of spool C 8 is with conocave plane H 11 in orifice plate A 10 once contact, and the passage that high pressure fuel enters control chamber 2 will be cut off, and will no longer include the waste of high pressure fuel.And the throttle orifice in draining road and the oil input channel of control chamber are independently, the throttle orifice in draining road can be selected a little bit smaller by flow area, to increase the opening speed of needle-valve; And that the oil input channel flow area of control chamber can be selected is very large, realize taking a seat fast of needle-valve.
Claims (9)
1. a New Common Rail oil sprayer, comprises oil injector body, control piston, it is characterized in that: the control valve above described control piston with a sliding valve core and ball valve composition;
Described sliding valve core top has the top oil pocket be connected with ball valve, is provided with valve core spring and is pressed on described sliding valve core top in the oil pocket of top;
In the middle part of described sliding valve core circumference have one in the middle part of oil pocket, communicated with top oil pocket by throttle orifice;
Described sliding valve core bottom circumference has a bottom oil pocket communicated with high pressure oil input channel;
There is bottom described sliding valve core the bottom oil pocket communicated with control piston top control chamber;
Described control chamber is communicated with middle part oil pocket by an oil duct;
Have a boss in the oil pocket of described sliding valve core bottom, described boss upper surface and bottom oil pocket end face match and form seal band and control bottom oil pocket and communicate with middle part oil pocket.
2. New Common Rail oil sprayer according to claim 1, is characterized in that: be provided with orifice plate A and orifice plate B above described oil injector body; Described sliding valve core is formed by connecting by spool C, spool D and attachment portion; Described orifice plate A, between orifice plate B and oil injector body, described bottom oil pocket is positioned on orifice plate A, and in the middle part of oil pocket top, bottom Ju Nei conocave plane H and spool C, boss plane coordinates formation seal band, and the bottom oil pocket on orifice plate A is connected with oil sprayer filler opening by high-pressure oil duct;
Described orifice plate B inside has the different top oil pocket of diameter and middle part oil pocket, and top and spool D coordinate formation top oil pocket, and spool D is directed at top oil pocket inwall; The section area of middle part oil pocket is greater than top oil pocket, is also provided with spill port and sealing cone at orifice plate B top;
Be provided with throttle orifice in described spool D and connect top oil pocket and middle part oil pocket, and communicated with control chamber by the oil duct be interconnected in orifice plate A, orifice plate B, oil injector body.
3. New Common Rail oil sprayer according to claim 2, is characterized in that: in described spool D, orifice diameter is 0.1 ~ 0.4mm.
4. New Common Rail oil sprayer according to claim 2, is characterized in that: be provided with the attachment hole be connected with throttle orifice in described spool D, connects middle part oil pocket and throttle orifice.
5. New Common Rail oil sprayer according to claim 2, is characterized in that: described spool C top and spool D bottom end face are provided with concave spherical surface, coordinates concave spherical surface and be fixedly connected with spool C and spool D with snap ring by steel ball.
6. New Common Rail oil sprayer according to claim 2, is characterized in that: in the middle part of oil pocket top, the bottom Ju Nei conocave plane H of described orifice plate A and spool C, boss plane coordinates formation seal band width to be 0.1 ~ 0.5mm.
7. New Common Rail oil sprayer according to claim 2, is characterized in that: in the middle part of oil pocket top, the bottom tool indent conical surface of described orifice plate A and spool C, boss cone match forms sealing.
8. the New Common Rail oil sprayer according to any one of claim 1-7, is characterized in that: the stroke of described sliding valve core is 0.03 ~ 0.12mm.
9. the New Common Rail oil sprayer according to any one of claim 2-7, is characterized in that: the diameter bottom described spool C is greater than boss diameter in the middle part of spool C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410375264.5A CN104265533B (en) | 2014-07-31 | 2014-07-31 | A kind of common-rail injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410375264.5A CN104265533B (en) | 2014-07-31 | 2014-07-31 | A kind of common-rail injector |
Publications (2)
| Publication Number | Publication Date |
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| CN104265533A true CN104265533A (en) | 2015-01-07 |
| CN104265533B CN104265533B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410375264.5A Active CN104265533B (en) | 2014-07-31 | 2014-07-31 | A kind of common-rail injector |
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| CN (1) | CN104265533B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105221314A (en) * | 2015-10-29 | 2016-01-06 | 常州机电职业技术学院 | Carbon deposition prevention oil sprayer |
| CN106870230A (en) * | 2017-01-06 | 2017-06-20 | 中国第汽车股份有限公司 | A kind of common-rail injector |
| CN107013390A (en) * | 2017-04-20 | 2017-08-04 | 温州大学 | A kind of magnetic valve fuel injector of adjustable fuel pressure |
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| EP1273790A2 (en) * | 2001-07-04 | 2003-01-08 | Robert Bosch Gmbh | Fuel injector for internal combustion engines |
| CN103026044A (en) * | 2009-04-30 | 2013-04-03 | 罗伯特·博世有限公司 | Pressure control valve and fuel injection device for an internal combustion engine |
| CN103180600A (en) * | 2010-10-28 | 2013-06-26 | 现代重工业株式会社 | Fuel-injection valve for an internal combustion engine |
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2014
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Patent Citations (5)
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| CN1222221A (en) * | 1996-06-20 | 1999-07-07 | 曼B与W狄赛尔公司 | Fuel injector for internal combustion engine |
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| CN103026044A (en) * | 2009-04-30 | 2013-04-03 | 罗伯特·博世有限公司 | Pressure control valve and fuel injection device for an internal combustion engine |
| CN103210190A (en) * | 2010-08-09 | 2013-07-17 | 罗伯特·博世有限公司 | Injection device |
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Non-Patent Citations (1)
| Title |
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| 李书泽等: "天然气发动机燃料供给系统研究现状", 《农业机械学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105221314A (en) * | 2015-10-29 | 2016-01-06 | 常州机电职业技术学院 | Carbon deposition prevention oil sprayer |
| CN106870230A (en) * | 2017-01-06 | 2017-06-20 | 中国第汽车股份有限公司 | A kind of common-rail injector |
| CN106870230B (en) * | 2017-01-06 | 2019-09-24 | 中国第一汽车股份有限公司 | A kind of common-rail injector |
| CN107013390A (en) * | 2017-04-20 | 2017-08-04 | 温州大学 | A kind of magnetic valve fuel injector of adjustable fuel pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104265533B (en) | 2016-08-24 |
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