CN205370817U - Diesel engine high pressure common rail's sprayer - Google Patents
Diesel engine high pressure common rail's sprayer Download PDFInfo
- Publication number
- CN205370817U CN205370817U CN201520931820.2U CN201520931820U CN205370817U CN 205370817 U CN205370817 U CN 205370817U CN 201520931820 U CN201520931820 U CN 201520931820U CN 205370817 U CN205370817 U CN 205370817U
- Authority
- CN
- China
- Prior art keywords
- core
- bullport
- fuel injector
- valve
- oil pocket
- 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.)
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- 239000000446 fuel Substances 0.000 claims abstract description 60
- 239000003921 oil Substances 0.000 claims description 42
- 239000000295 fuel oil Substances 0.000 claims description 11
- 238000009792 diffusion process Methods 0.000 description 24
- 230000000694 effects Effects 0.000 description 10
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 230000002411 adverse Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000003679 aging effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses a diesel engine high pressure common rail's sprayer, the sprayer includes the casing, and a ball valve setting is in inject return path and control oil pocket in the casing set up the valve stem assembly who realizes the oil spout of sprayer selectivity in the control oil pocket, the ball valve includes and is close to control the disk seat of oil pocket one side and be close to the ball core of return path one side device control in the return path the solenoid valve subassembly of ball core, through the selectivity of solenoid valve subassembly is launched or is stopped using, ball core selectivity switching the opening that forms on the disk seat, its characterized in that be equipped with in the disk seat cylindrical bullport with the opening communicates with each other, the ball core is in receive when just removing in the bullport the bullport guide, the bullport with the ball core has the size that receives the throttle when making the fuel flow through between them.
Description
Technical field
This utility model relates to the fuel injector adopted in diesel engine high-pressure co-rail, and this fuel injector has the ball valve seat structure of improvement.
Background technology
Widely used high-pressure common rail fuel feeding in diesel engine.High-pressure common rail is connected with fuel injector, and the latter is for being optionally ejected into high pressure fuel in the combustor of diesel engine.
At present, fuel injector majority includes elongated housing, is provided with ball valve in housing.Ball valve includes valve seat and core.Core is adjacent with the electromagnetic valve of fuel injector.The housing of fuel injector is provided with high pressure connection.It is divided in two oil circuits of fuel injector from the high pressure fuel of high-pressure common rail via described high pressure connection.One oil circuit passes to fuel injection chamber, until the jet of fuel injector.Another oil circuit is fed to control oil pocket, and wherein this control oil pocket connects with the valve seat of ball valve.At the downstream direction of this ball valve, the downstream direction being namely positioned in core, a drainback passage is arranged in housing.
Fuel injector also has a valve rod, and a part for this valve rod is positioned at control oil pocket, and another part is positioned at fuel injection chamber.When electromagnetic valve is not actuated, core blocks the through hole of valve seat so that drainback passage is completely isolated with control oil pocket.In the case, act on the spring force on valve rod and make to maintain the state of the jet of valve rod closure fuel injector.
When electromagnetic valve starts, the high pressure fuel from high pressure connection by core jack-up, thus high pressure fuel enters into drainback passage from controlling oil pocket, and finally can flow back in fuel tank, and this can cause that the pressure controlling in oil pocket declines.So, the pressure in fuel injection chamber, more than the pressure controlled in oil pocket, causes that valve rod moves away from jet, thus high pressure fuel can controllably be injected into the combustor of diesel engine.
Generally, in the above-mentioned through hole of valve seat, it is provided with a throttle orifice, for fuel oil throttling speed.In this through hole, the downstream of this throttle orifice is the diffusion hole section of a substantial cylindrical.Owing to the diameter of the diffusion hole section of this cylinder is significantly greater than the diameter of throttle orifice, so when high pressure fuel flows through throttle orifice from diffusion hole section, the bubble in fuel oil can be caused to produce, and the outlet of diffusion hole section and core can be caused the differential pressure that so-called " cavitation pitting " high pressure can cause bubbles burst and breaking to cause can further shock-diffusion bore section outlet inside wall and core by the bubble of this generation, cause that they quickly damage, thus causing core cannot reliably seal the outlet of diffusion hole section, affect the service life of fuel injector.
In order to reduce " cavitation pitting " phenomenon aging effects to fuel injector, urgent expectation improves the valve seat construction of fuel injector so that reduce " cavitation pitting " adverse effect to the outlet of diffusion hole section and core.
Utility model content
In order to solve the problems referred to above, the utility model proposes the fuel injector of a kind of improvement, wherein avoid " cavitation pitting " phenomenon adverse effect to core Yu diffusion hole section exit as far as possible.
nullAccording to an aspect of the present utility model，Provide the fuel injector of a kind of diesel engine high-pressure co-rail，Described fuel injector includes housing，One ball valve is arranged in described housing and limits drainback passage and control oil pocket，In described control oil pocket, the valve rod assembly realizing fuel injector selectivity oil spout is set，Described ball valve includes the valve seat near described control oil pocket side and the core near described drainback passage side，The electromagnetic valve component controlling described core is set in described drainback passage，By the selective enabling of described electromagnetic valve component or disable，The opening formed on valve seat described in described core selectivity opening and closing，It is characterized in that，In described valve seat, it is provided with cylindrical bullport communicate with described opening，Described core is guided by described bullport when being positioned at described bullport and be mobile，Described bullport and described core have the size so that being throttled when fuel oil flows through between them.
Alternatively, bigger than the external diameter of described core 0.1～0.2 millimeter of the internal diameter of described bullport.
Alternatively, described electromagnetic valve component includes an actuated components contacted with described core.
Alternatively, described actuated components is formed with one end, and described end can move in described bullport and directly contact with described core.
Alternatively, the spacing between outer surface and the inwall of described bullport of described end is at least 0.3 millimeter.
Alternatively, described end is cylindrical or in the taper towards described opening constriction.
Alternatively, the contact end face of described end is plane.
Alternatively, the contact end face of described end is formed with pit, contacts with described core.
Alternatively, the opening of described valve seat is cone, and when described core closes described opening, the spacing between inwall and the outer surface of described core of described bullport is less than 0.1 millimeter.
Adopt the above-mentioned technological means of the present invention, alleviate the adverse effect that diffusion hole section exit is sealed by " cavitation pitting ", simultaneously because avoid guiding the appurtenances of core to decrease the number of components of atomizer, reduce manufacture and maintenance cost.
Accompanying drawing explanation
Of the present utility model aforementioned and other side can be more fully understood from detailed description described later and in conjunction with figure below.It is pointed out that the ratio of each accompanying drawing is likely different for clarity of illustration, but this can't affect understanding of the present utility model.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the sectional view of the fuel injector according to embodiment of the present utility model；
Fig. 2 diagrammatically illustrates the amplification view of the ball valve in the fuel injector according to embodiment of the present utility model, i.e. dotted line circle part A as shown in Figure 1；And
Fig. 3 is the amplification view of broken box part B as shown in Figure 2.
Detailed description of the invention
In each accompanying drawing of the application, structure is identical or intimate feature is indicated by the same numbers.
Fig. 1 diagrammatically illustrates the fuel injector 1 according to an illustrative examples of the present utility model.This fuel injector 1 includes elongated housing 10.This housing 10 is provided with mean for hydraulic fluid port 20, and this oil-feed port can be connected with (not shown) high-pressure common rail via joint 21.Two oil pockets it are provided with in housing 10.One is control oil pocket, and another is fuel injection chamber.
Ball valve, electromagnetic valve 60 and the valve rod 40 that can move are installed in housing 10.As it is shown in figure 1, ball valve includes valve seat 30 and core 50.This core 50 is such as ball.One end of valve rod 40 valve seat 30 with described ball valve in described control oil pocket connects, and the other end of valve rod 40 connects with the oil-out 11 set in housing 10 via (unshowned) needle-valve.Valve rod 40 in housing 10, it is being additionally provided with support away from valve seat 30 place, is used for supporting valve rod 40, thus can vertically move in housing 10.Valve rod 40 can drive needle valve action, thus described valve rod 40 and described needle-valve constitute a valve rod assembly, via the action of described valve rod assembly, it is possible to achieve the selectivity oil spout of fuel injector.
After fuel injector assembling is in place, oil-out 11 leads in the combustor of (unshowned) diesel engine.The valve seat 30 of ball valve connects with controlling oil pocket, and fuel injection chamber connects with oil-out 11.
Two oil circuits it are formed with in housing 10.High pressure fuel is respectively supplied in the two oil circuit via oil-feed port 20.One oil circuit directly communicates with controlling oil pocket.Another oil circuit directly communicates with fuel injection chamber.It is to say, the hydraulic oil from oil-feed port 20 always can be fed in control oil pocket and fuel injection chamber.
Core 50 acts between electromagnetic valve 60 and valve seat 30.Being additionally provided with a drainback passage in housing 10, this drainback passage is connected with controlling oil pocket via ball valve, thus ball valve can control this drainback passage and control the break-make of oil pocket by selectivity.It is to say, ball valve limits described drainback passage and described control oil pocket in housing 10.Specifically, core 50 and electromagnetic valve 60 are positioned at the downstream at this drainback passage place, and control oil pocket and be positioned at upstream side.
As it is shown in figure 1, this core 50 is by spring 51 and 52 and the effect of associated actuation member 53 and 54, wherein actuated components is by the control of electromagnetic valve 60.Electromagnetic valve 60 is such as subject to the ECU of diesel engine and controls.When electromagnetic valve 60 is in stopped status; spring 51 and 52 and associated actuation member 53 and 54 effect under; core 50 presses valve seat 30; thus the through hole of valve seat 30 is closed; feed, from oil-feed port 20, the high pressure fuel controlling oil pocket and cannot back down core 50 via the through hole of valve seat 30 so that drainback passage and the oil circuit open circuit controlled between oil pocket.In the case, due to the spring force of effect on valve rod 40, valve rod 40 controls needle-valve and closely blocks oil-out 11, and fuel injector 1 cannot oil spout.
When electromagnetic valve 60 is controlled to start by ECU, spring 51 and 52 acts on the power in core 50 via actuated components 53 and 54 and reduces, high pressure fuel in control oil pocket can upwards back down core 50 via the through hole of valve seat 30 and enter drainback passage, is then back in fuel tank from drainback passage.So, control the pressure in oil pocket to reduce, cause the active force disequilibrium on valve rod 40, namely the pressure that control oil pocket acts on valve rod 40 acts on the pressure on valve rod 40 less than fuel injection chamber, valve rod 40 controls needle-valve and leaves oil-out 11, thus high pressure fuel can be injected in the combustor of diesel engine smoothly.
ECU is by controlling startup time and the frequency of electromagnetic valve 60, it is possible to control the distributive value of fuel injector as required.From the description above, it is also possible to think electromagnetic valve 60, spring 51 and 52 and actuated components 53 and 54 constitute the electromagnetic valve component controlling core 50.
It is concrete as in figure 2 it is shown, the through hole of valve seat 30 includes the throttle orifice 31 being positioned at upstream and the diffusion hole 32 being positioned at downstream.Core 50 can property selected as described above close diffusion hole 32 cone expose mouth.When core 50 is slightly off exposing mouth and high pressure fuel through through hole, pressurizes owing to first passing around the only small throttle orifice of diameter 31, then through the diffusion hole 32 being relatively large in diameter, cause fuel oil in diffusion hole 32 can produce a large amount of bubble.These substantial amounts of bubbles can impact the surface of core 50, causes less desirable " cavitation pitting ", affects the sealing property exposing mouth to diffusion hole 32.
In the prior art, valve seat diffusion hole expose mouth outwards locate, namely the downstream of diffusion hole have flare shape extend disperse mouth.In order to avoid core moves in this opening, also it is required to be core and special guiding piece is set.It has been investigated that, the mouth of dispersing of the outside flare shape producing mainly valve seat of the impulsive force of above-mentioned a large amount of bubble causes fuel pressure and declines suddenly, declining suddenly of this fuel pressure causes bubble flow quickly through the surface of core and/or expose mouth, causes " cavitation pitting ".
Therefore, in order to avoid this unexpected oil pressure declines " cavitation pitting " caused contacting the adverse effect at position at the mouth that exposes with diffusion hole 32 to core 50, this utility model considers to expose, away from core 50 and diffusion hole 32, the position setting that mouth contacts by being likely to occur position that this unexpected oil pressure declines.
Therefore, as Fig. 2 and 3 are further illustrated, also including the bullport 33 being positioned at described diffusion hole 32 downstream according to valve seat 30 of the present utility model, this bullport 33 communicates with described through hole.This bullport 33 is such as cylindrical hole, and for core 50 being constrained in wherein movably, and bigger than the outer diameter D 1 of core 50 0.2 millimeter of the internal diameter d of bullport 33, such as big scope can be between 0.1 millimeter and 0.2 millimeter.So, when core 50 is seated against on cone exposure mouth, due to the centering effect of cone so that the spacing between outer surface and the inwall of bullport 33 of core 50 is less than 0.1 millimeter.It practice, this closely spaced design also can play the effect of throttling fuel oil.
In the embodiment being previously mentioned, core 50 is the shape that standard is spherical.If but the shape that core 50 is non-uniform spherical, such as elliposoidal or compressed globular shape, then flow through in order to ensure fuel oil and between core and the inwall of bullport, realize throttling, the external diameter with the hithermost periphery of bullport inwall of core 50 can be arranged to less than the internal diameter of bullport 33 0.2 millimeter, for instance little scope can be between 0.1 millimeter and 0.2 millimeter.
So, when fuel oil needs the exposure mouth from diffusion hole 32 downstream to drain, do not have unexpected pressure in the position exposed between mouth of core 50 and diffusion hole 32 to decline, therefore, even if there is a large amount of bubble in fuel oil, these bubbles are without for the outer surface closing diffusion hole 32, core 50 is caused intense impact.Thus, it is to avoid " cavitation pitting " phenomenon exposes, for diffusion hole 32, the adverse effect that mouth seals.
It addition, according to this utility model, because core 50 can be played good guiding function by bullport 33, be therefore no longer necessary to arrange such as that independent guiding piece of the prior art for core 50 again.It practice, in a preferred version of the present utility model, actuated components 54 can be arranged to directly contact with core 50.In this case, closing when exposing mouth of diffusion hole 32 at core 50, core 50 can extend slightly out bullport 33 and contact with actuated components 54.
It is preferable that as shown in Figures 2 and 3, actuated components 54 includes one end 54a, and this end 54a can also extend in the bullport 33 of valve seat 30.This end 54a is such as cylindrical and end face directly contacts with core 50.Alternatively, for the ease of assembling, this end 54a can also be in towards exposing the taper of mouth constriction or other any suitable shape.Nevertheless, after atomizer assembles, the spacing between outer surface and the inwall of bullport 33 of this end should be at least 0.3 millimeter.
The end face contacted with core 50 of this end 54a can be plane.It is, however, preferable that be provided with pit on the contact end face of the end 54a of actuated components 54, for more stably contact core 50.
Namely the internal diameter d of bullport 33 outer diameter D 2 than end 54a at least 0.6 millimeter greatly, thus may insure that and fuel oil will not causing throttling affect the smooth discharge of fuel oil again.Additionally, bullport 33 can also realize the guiding to end 54a when necessary.
Although describing particular implementation of the present utility model here in detail, but they are only used to the purpose of explanation and provide, and it is not considered that scope of the present utility model is construed as limiting by they.Under the premise without departing from this utility model spirit and scope, various replacements, change and transformation can be contemplated out.
Claims (9)
- null1. the fuel injector of a diesel engine high-pressure co-rail，Described fuel injector includes housing (10)，One ball valve is arranged in described housing and limits drainback passage and control oil pocket，In described control oil pocket, the valve rod assembly realizing fuel injector selectivity oil spout is set，Described ball valve includes the valve seat (30) near described control oil pocket side and the core (50) near described drainback passage side，The electromagnetic valve component controlling described core is set in described drainback passage，By the selective enabling of described electromagnetic valve component or disable，The opening formed on valve seat described in described core selectivity opening and closing，It is characterized in that，In described valve seat, it is provided with cylindrical bullport (33) communicate with described opening，Described core (50) is guided by described bullport (33) when being positioned at described bullport (33) and be mobile，Described bullport (33) and described core (50) have the size so that being throttled when fuel oil flows through between them.
- 2. fuel injector according to claim 1, it is characterised in that bigger than the external diameter of described core 0.1～0.2 millimeter of the internal diameter of described bullport (33).
- 3. fuel injector according to claim 1 and 2, it is characterised in that described electromagnetic valve component includes an actuated components (54) contacted with described core (50).
- 4. fuel injector according to claim 3, it is characterized in that, described actuated components (54) is formed with one end (54a), and described end (54a) can move in described bullport (33) and directly contact with described core (50).
- 5. fuel injector according to claim 4, it is characterised in that described end (54a) is cylindrical or in the taper towards described opening constriction.
- 6. fuel injector according to claim 5, it is characterised in that the spacing between outer surface and the inwall of described bullport (33) of described end (54a) is at least 0.3 millimeter.
- 7. fuel injector according to claim 6, it is characterised in that the contact end face of described end (54a) is plane.
- 8. fuel injector according to claim 6, it is characterised in that be formed with pit on the contact end face of described end (54a), contact with described core (50).
- 9. fuel injector according to claim 3, it is characterized in that, the opening of described valve seat (30) is cone, when described core (50) closes described opening, the spacing between inwall and the outer surface of described core (50) of described bullport (33) is less than 0.1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520931820.2U CN205370817U (en) | 2015-11-19 | 2015-11-19 | Diesel engine high pressure common rail's sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520931820.2U CN205370817U (en) | 2015-11-19 | 2015-11-19 | Diesel engine high pressure common rail's sprayer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205370817U true CN205370817U (en) | 2016-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520931820.2U Active CN205370817U (en) | 2015-11-19 | 2015-11-19 | Diesel engine high pressure common rail's sprayer |
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| Country | Link |
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| CN (1) | CN205370817U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089465A (en) * | 2016-08-24 | 2016-11-09 | 湖南大学 | A kind of device realizing fuel injector injection control strategy |
| CN107795421A (en) * | 2016-09-02 | 2018-03-13 | 罗伯特·博世有限公司 | fuel injector for engine |
-
2015
- 2015-11-19 CN CN201520931820.2U patent/CN205370817U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089465A (en) * | 2016-08-24 | 2016-11-09 | 湖南大学 | A kind of device realizing fuel injector injection control strategy |
| CN106089465B (en) * | 2016-08-24 | 2018-10-02 | 湖南大学 | A kind of device for realizing fuel injector injection control strategy |
| CN107795421A (en) * | 2016-09-02 | 2018-03-13 | 罗伯特·博世有限公司 | fuel injector for engine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |