CN104314722A - Pressure balance electrically-controlled injector - Google Patents
Pressure balance electrically-controlled injector Download PDFInfo
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- CN104314722A CN104314722A CN201410550085.0A CN201410550085A CN104314722A CN 104314722 A CN104314722 A CN 104314722A CN 201410550085 A CN201410550085 A CN 201410550085A CN 104314722 A CN104314722 A CN 104314722A
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- armature
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- communicated
- lug boss
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Abstract
The invention discloses a pressure balance electrically-controlled injector. The pressure balance electrically-controlled injector comprises an injector body and a control valve assembly, wherein the injector body is provided with a plunger cavity, a mounting cavity and an oil return channel; the plunger cavity is communicated with the oil return channel through the mounting cavity; an oil pressure plunger is arranged in the plunger cavity; the control valve assembly is arranged in the mounting cavity; a cavity between the control valve assembly and the oil pressure plunger forms a control cavity; the control valve assembly is used for controlling the connection and disconnection of the oil return channel and the control cavity. An innovation point is that the connection and disconnection of the oil return channel and the control cavity are controlled by adopting the control valve assembly of a novel structure, so that high pressure in the control cavity does not act on the control valve. The pressure balance electrically-controlled injector has the beneficial technical effects that a higher pressure can be formed in the control cavity under the condition of not increasing the size of the control valve assembly.
Description
Technical field
The present invention relates to a kind of electronic control injection technology, particularly relate to a kind of pressure balance type electric-controlled fuel injector.
Background technique
Along with the progress of society, the requirement of Abgasgesetz is also more and more stricter, and in order to improve the discharge of motor further, a kind of comparatively effective means are the jet pressures by improving during fuel oil injection, improve the atomizing effect of fuel oil, and then fuel oil is burnt more fully.
In prior art, electric-controlled fuel injector is generally made up of oil injector body and control valve assembly, oil injector body is provided with plunger cavity, installation cavity and back oil road, plunger cavity is communicated with back oil road by installation cavity, oil pressure plunger is provided with in plunger cavity, control valve assembly is arranged in installation cavity, the cavity formation control chamber between control valve assembly and oil pressure plunger, and control valve assembly is for controlling the break-make between back oil road and control chamber; During electric-controlled fuel injector work, by making the action of the action of control valve assembly and oil pressure plunger cooperatively interact, just can carry out adjustment to the fuel pressure in control chamber and finally realize fuel oil spraying.
Aforementioned schemes Problems existing is: in prior art, control valve assembly generally pushes against steel ball by armature and realizes shutoff between back oil road and control chamber (when armature does not push against steel ball, conducting between back oil road and control chamber), thus high pressure is formed in control chamber, having no progeny at back oil road and control chamber pass, (back oil road and control chamber close and have no progeny, along with the action of oil pressure plunger, fuel pressure in control chamber starts to raise gradually), steel ball to bear the power of two aspects, what come from armature on the one hand pushes against power, come from the fuel pressure in control chamber on the other hand, when the effect pushing against power is greater than the effect of fuel pressure, back oil road and control chamber just can keep off state, but when the effect of fuel pressure is greater than the effect of the power of pushing against, the off state between back oil road and control chamber will terminate, after the specification sizing of armature and Returnning spring, it is also relatively fixing that what armature can provide push against power, in other words, for concrete armature and Returnning spring type, what it can provide pushes against power is definite value, this just makes the pressure of the high pressure fuel that can be formed in control chamber also there is the upper limit, if make to form larger pressure in control chamber, what just need further increase armature pushes against power, based on the control valve assembly of existing structure, make armature push against power to increase, increase armature quality, increase Returnning spring elastic force, or increase armature quality and spring force simultaneously, and in order to control flexibly armature, correspondingly also to increase the electromagnetic force of solenoid valve, no matter which kind of mode, finally control valve assembly size all will be caused significantly to increase, for assembling, except may needing to redesign electric-controlled fuel injector structure, also may need electric-controlled fuel injector surrounding components, the structure of device also redesigns.
Summary of the invention
For the problem in background technique, the present invention proposes a kind of electric-controlled fuel injector, comprise oil injector body and control valve assembly, described oil injector body is provided with plunger cavity, installation cavity and back oil road, plunger cavity is communicated with back oil road by installation cavity, oil pressure plunger (oil pressure plunger is for controlling needle valve movement) is provided with in plunger cavity, control valve assembly is arranged in installation cavity, cavity formation control chamber between control valve assembly and oil pressure plunger, control valve assembly is for controlling the break-make between back oil road and control chamber; Its innovation is:
Described control valve assembly by control spool, locking swivel nut, solenoid valve, Returnning spring and armature form; The shaft section of described control spool is inverted T-shaped, and the top of inverted T-shaped is designated as lug boss, and the bottom of inverted T-shaped is designated as round plate, and the lower end surface of round plate contacts with bottom installation cavity, is provided with the shrinkage pool be communicated with control chamber in the middle part of the lower end surface of round plate; The sidewall of lug boss is provided with radial direction through hole, and lug boss outer wall is communicated with shrinkage pool by radial direction through hole; The outer circumferential face of lug boss is provided with the conical surface one, the conical surface one is positioned at below radial direction through hole; The outer circumferential face of round plate is communicated with back oil road; Shrinkage pool lower ending opening place is horn mouth, and bell-mouthed sidewall is communicated with the outer circumferential face of round plate by draining road; The shaft section of described armature is T-shaped, and the top of T-shaped is designated as armature section, and the bottom of T-shaped is designated as valve pocket section, and armature section is positioned at above valve pocket section, and valve pocket section is positioned at above round plate; Be provided with axial hole in the middle part of armature, lug boss is socketed in axial hole, energy relative sliding between axial hole and lug boss, and the lower ending opening place of axial hole is provided with the conical surface two, and the conical surface two mates with the conical surface one; Solenoid valve is arranged at above armature; Be provided with spring groove in the middle part of solenoid valve, Returnning spring is arranged in spring groove, and Returnning spring upper end contacts with the bottom land of spring groove, and Returnning spring lower end contacts with armature upper-end surface; Returnning spring is in its pre-compressed state; Be provided with axial hole in the middle part of locking swivel nut, the outer circumferential face of locking swivel nut is threaded with installation cavity, and locking swivel nut lower end surface is against on the upper-end surface of round plate, leaves gap between axial hole inwall and valve pocket section outer wall; The sidewall of locking swivel nut is provided with oblique through hole, and round plate outer circumferential face is communicated with axial hole by oblique through hole; When armature motion is to up maximum travel position place, radial direction through hole is communicated with axial hole.
Principle of the present invention is: when solenoid valve power-off, armature is at the falls downward of self gravitation and Returnning spring elastic force, the conical surface two and the conical surface one are fitted, radial direction through hole on lug boss is wrapped in interior by valve pocket section and isolates with the axial hole that locking screw puts, now, control chamber is respectively by the radial direction through hole on draining road and lug boss and ft connection, wherein, just outwards flowed out by back oil road by the high pressure fuel of draining track overflow, can not be applied on armature, in the high pressure fuel overflowed by radial direction through hole is arrested in by valve pocket section, as can be seen from structural drawing, the high pressure fuel at radial direction through hole place acts on radial direction on the inwall of valve pocket section, vertical with the glide direction of valve pocket section, that can not offset armature pushes against power, even if the pressure in control chamber is very high, also only need the less power that pushes against that control chamber just can be made to keep closed state, which solves in prior art to need to rely on to increase and push against power to improve the problem of control chamber pressure, when solenoid valves, armature overcomes Returnning spring elastic force and moves upward under the effect of electromagnetic force, and the conical surface two is separated with the conical surface one, and outside the radial direction through hole on lug boss is exposed to, the fuel oil in control chamber is by the outside pressure release of radial direction through hole, and needle-valve is opened and realized spraying.
Preferably, the outer wall of described lug boss is provided with annular groove, and radial direction through hole is communicated with annular groove.Annular groove can make the fuel pressure at radial direction through hole place be applied on valve pocket section inwall equably, improves the counterbalance effect in outside in valve pocket section.
Preferably, the upper-end surface of described lug boss is provided with guide section, guide section extends in Returnning spring endoporus.
Advantageous Effects of the present invention is: provide a kind of new pressure balance type electric-controlled fuel injector, can, under the condition not increasing control valve assembly size, make to form larger pressure in control chamber.
Accompanying drawing explanation
Fig. 1, structural representation of the present invention;
In figure each mark corresponding to title be respectively: control spool 1, oil injector body 3, locking swivel nut 4, axial hole 4-1, oil pressure plunger 5, solenoid valve 6, Returnning spring 7, control chamber 8, shrinkage pool 10, radial direction through hole 11, back oil road 12, armature 13, draining road 14, oblique through hole 15.
Embodiment
A kind of pressure balance type electric-controlled fuel injector, comprise oil injector body 3 and control valve assembly, described oil injector body 3 is provided with plunger cavity, installation cavity and back oil road 12, plunger cavity is communicated with back oil road 12 by installation cavity, oil pressure plunger 5 is provided with in plunger cavity, control valve assembly is arranged in installation cavity, the cavity formation control chamber 8 between control valve assembly and oil pressure plunger 5, and control valve assembly is for controlling the break-make between back oil road 12 and control chamber 8; Its innovation is:
Described control valve assembly by control spool 1, locking swivel nut 4, solenoid valve 6, Returnning spring 7 and armature 13 form;
The shaft section of described control spool 1 is inverted T-shaped, and the top of inverted T-shaped is designated as lug boss, and the bottom of inverted T-shaped is designated as round plate, and the lower end surface of round plate contacts with bottom installation cavity, is provided with the shrinkage pool 10 be communicated with control chamber 8 in the middle part of the lower end surface of round plate; The sidewall of lug boss is provided with radial direction through hole 11, lug boss outer wall is communicated with shrinkage pool 10 by radial direction through hole 11; The outer circumferential face of lug boss is provided with the conical surface one, the conical surface one is positioned at below radial direction through hole 11; The outer circumferential face of round plate is communicated with back oil road 12; Shrinkage pool 10 lower ending opening place is horn mouth, and bell-mouthed sidewall is communicated with the outer circumferential face of round plate by draining road 14;
The shaft section of described armature 13 is T-shaped, and the top of T-shaped is designated as armature section, and the bottom of T-shaped is designated as valve pocket section, and armature section is positioned at above valve pocket section, and valve pocket section is positioned at above round plate; Be provided with axial hole in the middle part of armature 13, lug boss is socketed in axial hole, energy relative sliding between axial hole and lug boss, and the lower ending opening place of axial hole is provided with the conical surface two, and the conical surface two mates with the conical surface one;
Solenoid valve 6 is arranged at above armature 13; Be provided with spring groove in the middle part of solenoid valve 6, Returnning spring 7 is arranged in spring groove, and Returnning spring 7 upper end contacts with the bottom land of spring groove, and Returnning spring 7 lower end contacts with armature 13 upper-end surface; Returnning spring 7 is in its pre-compressed state;
Be provided with axial hole 4-1 in the middle part of locking swivel nut 4, the outer circumferential face of locking swivel nut 4 is threaded with installation cavity, and locking swivel nut 4 lower end surface is against on the upper-end surface of round plate, leaves gap between axial hole 4-1 inwall and valve pocket section outer wall; The sidewall of locking swivel nut 4 is provided with oblique through hole 15, and round plate outer circumferential face is communicated with axial hole 4-1 by oblique through hole 15; When armature 13 moves to up maximum travel position place, radial direction through hole 11 is communicated with axial hole 4-1.
Further, the outer wall of described lug boss is provided with annular groove, radial direction through hole 11 is communicated with annular groove.
Further, the upper-end surface of described lug boss is provided with guide section, guide section extends in Returnning spring 7 endoporus.
Claims (3)
1. a pressure balance type electric-controlled fuel injector, comprise oil injector body (3) and control valve assembly, described oil injector body (3) is provided with plunger cavity, installation cavity and back oil road (12), plunger cavity is communicated with back oil road (12) by installation cavity, oil pressure plunger (5) is provided with in plunger cavity, control valve assembly is arranged in installation cavity, cavity formation control chamber (8) between control valve assembly and oil pressure plunger (5), control valve assembly is for controlling the break-make between back oil road (12) and control chamber (8); It is characterized in that:
Described control valve assembly forms by controlling spool (1), locking swivel nut (4), solenoid valve (6), Returnning spring (7) and armature (13);
The shaft section of described control spool (1) is inverted T-shaped, the top of inverted T-shaped is designated as lug boss, the bottom of inverted T-shaped is designated as round plate, and the lower end surface of round plate contacts with bottom installation cavity, is provided with the shrinkage pool (10) be communicated with control chamber (8) in the middle part of the lower end surface of round plate; The sidewall of lug boss is provided with radial direction through hole (11), lug boss outer wall is communicated with shrinkage pool (10) by radial direction through hole (11); The outer circumferential face of lug boss is provided with the conical surface one, the conical surface one is positioned at radial direction through hole (11) below; The outer circumferential face of round plate is communicated with back oil road (12); Shrinkage pool (10) lower ending opening place is horn mouth, and bell-mouthed sidewall is communicated with the outer circumferential face of round plate by draining road (14);
The shaft section of described armature (13) is T-shaped, and the top of T-shaped is designated as armature section, and the bottom of T-shaped is designated as valve pocket section, and armature section is positioned at above valve pocket section, and valve pocket section is positioned at above round plate; Armature (13) middle part is provided with axial hole, and lug boss is socketed in axial hole, energy relative sliding between axial hole and lug boss, and the lower ending opening place of axial hole is provided with the conical surface two, and the conical surface two mates with the conical surface one;
Solenoid valve (6) is arranged at armature (13) top; Solenoid valve (6) middle part is provided with spring groove, and Returnning spring (7) is arranged in spring groove, and Returnning spring (7) upper end contacts with the bottom land of spring groove, and Returnning spring (7) lower end contacts with armature (13) upper-end surface; Returnning spring (7) is in its pre-compressed state;
Locking swivel nut (4) middle part is provided with axial hole (4-1), the outer circumferential face of locking swivel nut (4) is threaded with installation cavity, locking swivel nut (4) lower end surface is against on the upper-end surface of round plate, leaves gap between axial hole (4-1) inwall and valve pocket section outer wall; The sidewall of locking swivel nut (4) is provided with oblique through hole (15), and round plate outer circumferential face is communicated with axial hole (4-1) by oblique through hole (15); When armature (13) moves to up maximum travel position place, radial direction through hole (11) is communicated with axial hole (4-1).
2. pressure balance type electric-controlled fuel injector according to claim 1, is characterized in that: the outer wall of described lug boss is provided with annular groove, radial direction through hole (11) is communicated with annular groove.
3. pressure balance type electric-controlled fuel injector according to claim 1, is characterized in that: the upper-end surface of described lug boss is provided with guide section, guide section extends in Returnning spring (7) endoporus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410550085.0A CN104314722A (en) | 2014-10-17 | 2014-10-17 | Pressure balance electrically-controlled injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410550085.0A CN104314722A (en) | 2014-10-17 | 2014-10-17 | Pressure balance electrically-controlled injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104314722A true CN104314722A (en) | 2015-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410550085.0A Pending CN104314722A (en) | 2014-10-17 | 2014-10-17 | Pressure balance electrically-controlled injector |
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| Country | Link |
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| CN (1) | CN104314722A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1612399A1 (en) * | 2004-06-30 | 2006-01-04 | C.R.F. Società Consortile per Azioni | A fuel injector for an internal combustion engine |
| US20060032950A1 (en) * | 2004-06-30 | 2006-02-16 | Mario Ricco | Internal combustion engine fuel injector |
| US20100294240A1 (en) * | 2006-10-23 | 2010-11-25 | Andreas Rettich | Injector for injecting fuel into combustion chambers of internal combustion engines |
| CN102213165A (en) * | 2010-04-08 | 2011-10-12 | 北京亚新科天纬油泵油嘴股份有限公司 | High pressure common rail electronic control fuel injector |
| CN103016226A (en) * | 2011-09-27 | 2013-04-03 | 日立汽车系统株式会社 | Fuel injector |
| CN204152697U (en) * | 2014-10-17 | 2015-02-11 | 中国重汽集团重庆燃油喷射系统有限公司 | Pressure balance type electric-controlled fuel injector |
-
2014
- 2014-10-17 CN CN201410550085.0A patent/CN104314722A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1612399A1 (en) * | 2004-06-30 | 2006-01-04 | C.R.F. Società Consortile per Azioni | A fuel injector for an internal combustion engine |
| US20060032950A1 (en) * | 2004-06-30 | 2006-02-16 | Mario Ricco | Internal combustion engine fuel injector |
| US20100294240A1 (en) * | 2006-10-23 | 2010-11-25 | Andreas Rettich | Injector for injecting fuel into combustion chambers of internal combustion engines |
| CN102213165A (en) * | 2010-04-08 | 2011-10-12 | 北京亚新科天纬油泵油嘴股份有限公司 | High pressure common rail electronic control fuel injector |
| CN103016226A (en) * | 2011-09-27 | 2013-04-03 | 日立汽车系统株式会社 | Fuel injector |
| CN204152697U (en) * | 2014-10-17 | 2015-02-11 | 中国重汽集团重庆燃油喷射系统有限公司 | Pressure balance type electric-controlled fuel injector |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150128 |