CN205592051U - Fuel injector - Google Patents
Fuel injector Download PDFInfo
- Publication number
- CN205592051U CN205592051U CN201620197612.9U CN201620197612U CN205592051U CN 205592051 U CN205592051 U CN 205592051U CN 201620197612 U CN201620197612 U CN 201620197612U CN 205592051 U CN205592051 U CN 205592051U
- Authority
- CN
- China
- Prior art keywords
- needle
- valve
- fuel
- pressure
- room
- 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 74
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 239000002283 diesel fuel Substances 0.000 claims description 2
- 239000003345 natural gas Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 239000007921 spray Substances 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract 3
- 238000007789 sealing Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses a fuel injector, needle valve including the ware body, nozzle valve and electromagnets dirver, nozzle valve fixes on the ware body through tight cap, its characterized in that: it holds the chamber to have fuel between needle valve and nozzle valve, the ware body, the needle valve middle part is provided with the guide block, form the glide plane between guide block and the nozzle valve wall, the guide block will fuel holds the pressure balance room that the chamber was split into the pressure accumulation room that is located the needle valve head and was located the needle valve rear portion, it is indoor that the fuel entry is located pressure balance, circumference is provided with the differential pressure room between guide block and the nozzle valve wall, the differential pressure room is linked together with the pressure balance room, the differential pressure room is linked together through orifice and pressure accumulation room. The utility model discloses be adapted to gas and fuel pluralities of fuel, have the oil return line of need not, spray stable, the needle valve slides, and (injections) resistance is little, fuel pressure is undulant little, nozzle valve does not have the processing of needs pressure accumulation room, nozzle valve and needle valve are not the idol forms in the tradition, its fit clearance is greater than the even piece fit clearance of tradition far away, possible exchange, the advantage of handling ease.
Description
Technical field
This utility model belongs to technical field of internal combustion engines, particularly relates to a kind of fuel nozzle being applicable to pluralities of fuel.
Background technology
The nozzle of prior art is as shown in Figure 1.Its operation principle is: when needle-valve 36 under spring force, fuel fuel inlet A 32 on body 31 enters the fuel inlet B 34 on needle-valve body 35, and under the sealing of band 38 and sliding sealing surface 310, pressure accumulating chamber 39 sets up pressure.Slipper seal band 310 fuel leaked enters feed back chamber 311.The pressure of pressure accumulating chamber 39 is much higher than feed back chamber 311.When needle-valve 36 overcomes return spring 312 power to left movement, band 38 separates, and fuel sprays from jet 37.Along with the raising of expulsion pressure, the static state between this structure injector nozzle matching parts dramatically increases with dynamic leakage amount；It addition, this structure needs to use corresponding oil return pipe line apparatus this leakage drain to be walked, corresponding cost is brought particularly to where there is integrity problem during diesel engine uses.And, this structure is in order to reduce the leakage of sliding sealing surface, it is ensured that sealing effectiveness, requires higher for needle-valve and the processing of needle-valve body, assembly precision.
Utility model content
This utility model purpose is to provide a kind of novel needle-valve and needle-valve body structure for the defect of prior art, change traditional couple version and (be originally slipper seal form, slide exactly now), without pressure accumulating chamber and fuel feed hole in needle-valve body, without oil return, frictional force is little, fast response time, the fuel nozzle being applicable to pluralities of fuel that the fluctuation of jetting stability, fuel pressure is little.
This utility model for achieving the above object, adopts the following technical scheme that
A kind of fuel nozzle, needle-valve including body, needle-valve body and solenoid actuated, described needle-valve body is fixed on body by tight cap, it is characterized in that: there is between described needle-valve and needle-valve body, body fuel cavity volume, it is provided with guide pad in the middle part of described needle-valve, between described guide pad and needle-valve body wall, forms sliding surface；Described fuel cavity volume is divided into the pressure accumulating chamber being positioned at needle-valve head and the pressure equalizing chamber being positioned at needle-valve rear portion by described guide pad；It is indoor that fuel inlet is positioned at pressure balance；Being circumferentially provided with differential pressure room between described guide pad and needle-valve body wall, described differential pressure room is connected with pressure equalizing chamber, and described differential pressure room is connected with pressure accumulating chamber by throttle orifice.
It is further characterized by described fuel inlet and is arranged on body, and fuel is directly entered fuel injector assembly through fuel inlet.
Described electric magnet includes solenoid and armature, and described needle-valve afterbody passes through support positioning and guiding；It is provided with axial gap spring between described armature and needle-valve afterbody, is used for overcoming sealed seat surface and the axial length space of armature between needle-valve head and needle-valve body；It is provided with pressure spring, for adjusting the seal pressure of sealed seat surface between needle-valve head and needle-valve body on described needle-valve.
Preferred: described differential pressure room is connected by the fuel gallery being arranged on guide pad with pressure equalizing chamber；Described throttle orifice is arranged in the guide pad of needle-valve, connects described differential pressure room and pressure accumulating chamber.
Between described guide pad and needle-valve body wall, gap is 0.007mm-0.035mm.
Described fuel nozzle is fuel used for diesel oil or natural gas.
Except contacting at jet and guide pad between this utility model needle-valve and needle-valve body, remainder forms a big fuel cavity, adds the capacity of fuel, is adapted to combustion gas and fuel oil pluralities of fuel.Not having pressure accumulating chamber and fuel access aperture in needle-valve body, fuel inlet is arranged on body, and fuel is directly entered fuel injector assembly through fuel inlet, thus adds the stability of injection, decreases fuel slash., there is not sealing surface in only one of which sliding surface between needle-valve and needle-valve body, the requirement on machining accuracy for needle-valve and needle-valve body is not the highest.It is connected with throttle orifice by passage between pressure accumulating chamber and pressure equalizing chamber, it is not necessary to return line.Pressure reduction is produced between pressure accumulating chamber and pressure equalizing chamber so that guide pad is in suspended state, decreases the injection resistance of needle-valve during fuel injection.The seal pressure of sealed seat surface between needle-valve head and needle-valve body is adjusted easily also by adjusting pressure spring.
Accompanying drawing explanation
Fig. 1 is prior art construction schematic diagram.
Fig. 2 is this utility model structural representation.
Detailed description of the invention
A kind of fuel nozzle as shown in Figure 2, the needle-valve 11 driven including body 10, needle-valve body 13 and electric magnet 1, described needle-valve body 13 is fixed on body 10 by tight cap 12.Form fuel cavity volume between described needle-valve 11 and needle-valve body 13, body 10, in the middle part of described needle-valve 11, be provided with guide pad 18, between described guide pad 18 and needle-valve body 13 wall, form sliding surface 20.Described fuel cavity volume is divided into the pressure accumulating chamber 16 being positioned at needle-valve 11 head and the pressure equalizing chamber 23 being positioned at needle-valve 11 rear portion by described guide pad 18.Described pressure accumulating chamber 16 is between needle-valve 11 and needle-valve body 13, and described pressure equalizing chamber 23 is between needle-valve 11 and body 10.Fuel inlet 22 is positioned at pressure equalizing chamber 23.Being circumferentially provided with differential pressure room 17 between described guide pad 18 and needle-valve body 13 wall, described differential pressure room 17 is connected by the fuel gallery 21 being arranged on guide pad 18 with pressure equalizing chamber 23.Guide pad 18 is provided with throttle orifice 19, connects described differential pressure room 17 and pressure accumulating chamber 16.
Described needle-valve 11 afterbody passes through support 7 positioning and guiding；It is provided with axial gap spring 6, for the axial length gap of sealed seat surface and armature residual gap between needle-valve head and needle-valve body between armature 5 and needle-valve 11 afterbody；It is provided with pressure spring 9, for adjusting the seal pressure of sealed seat surface between needle-valve 11 head and needle-valve body 13 on described needle-valve 11.
Except contacting at jet 15 and guide pad 18 between needle-valve 11 with needle-valve body 13, remainder forms a big fuel cavity, adds the capacity of fuel, is adapted to combustion gas and fuel oil pluralities of fuel.Meanwhile, add the stability of expulsion pressure, decrease fuel slash, improve degree of accuracy and the concordance of emitted dose.
Its operation principle is as follows:
When electric magnet 1 access failure power supply: fuel enters pressure equalizing chamber 23 by the fuel inlet 22 on body 10, differential pressure room 17 is entered by pressure equalizing chamber 23, pressure accumulating chamber 16 is entered back into by differential pressure room 17, sealed by band 14 because of needle-valve 11 and needle-valve body 13 again, within the regular hour so that pressure equalizing chamber 23, differential pressure room 17, pressure accumulating chamber 16 pressure are equal.
When electric magnet 1 switches on power: electric magnet 1 overcomes the power adhesive street ferrum 5 of spring 2 to drive needle-valve 11 to left movement by back-up ring 4, makes the band 14 of needle-valve 11 depart from needle-valve body 13.Fuel is sprayed by jet 15, pressure equalizing chamber 23, the pressure of differential pressure room 17 now are higher than pressure accumulating chamber 16, because on needle-valve 11, guide pad has throttle orifice 19, the some of the fuel in differential pressure room 17 is forced to enter pressure accumulating chamber 16 along sliding surface 20, sliding surface 20 is under fuel pressure effect, produce fuel flowing film, make needle-valve 11 be in suspended state, decrease the resistance of injection.Together with entering the fuel of pressure accumulating chamber 16 and entered the fuel of pressure accumulating chamber 16 by throttle orifice 19 by sliding surface 20, spray through jet 15 from pressure accumulating chamber 16.
Claims (6)
1. a fuel nozzle, needle-valve including body, needle-valve body and solenoid actuated, described needle-valve body is fixed on body by tight cap, it is characterized in that: there is between described needle-valve and needle-valve body, body fuel cavity volume, it is provided with guide pad in the middle part of described needle-valve, between described guide pad and needle-valve body wall, forms sliding surface；Described fuel cavity volume is divided into the pressure accumulating chamber being positioned at needle-valve head and the pressure equalizing chamber being positioned at needle-valve rear portion by described guide pad；It is indoor that fuel inlet is positioned at pressure balance；Being circumferentially provided with differential pressure room between described guide pad and needle-valve body wall, described differential pressure room is connected with pressure equalizing chamber, and described differential pressure room is connected with pressure accumulating chamber by throttle orifice.
Fuel nozzle the most according to claim 1, it is characterised in that: described fuel inlet is arranged on body, and fuel is directly entered fuel injector assembly through fuel inlet.
Fuel nozzle the most according to claim 1, it is characterised in that: described electric magnet includes solenoid and armature, and described needle-valve afterbody passes through support positioning and guiding；It is provided with axial gap spring between described armature and needle-valve afterbody, is used for overcoming sealed seat surface and the axial length space of armature between needle-valve head and needle-valve body；It is provided with pressure spring, for adjusting the seal pressure of sealed seat surface between needle-valve head and needle-valve body on described needle-valve.
4. according to the fuel nozzle described in any one of claim 1-3, it is characterised in that: described differential pressure room is connected by the fuel gallery being arranged on guide pad with pressure equalizing chamber；Described throttle orifice is arranged on the guide pad of needle-valve, connects described differential pressure room and pressure accumulating chamber.
5. according to the fuel nozzle described in any one of claim 1-3, it is characterised in that: between described guide pad and needle-valve body wall, gap is 0.007mm-0.035mm.
6. according to the fuel nozzle described in any one of claim 1-3, it is characterised in that: described fuel nozzle is fuel used for diesel oil or natural gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620197612.9U CN205592051U (en) | 2016-03-15 | 2016-03-15 | Fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620197612.9U CN205592051U (en) | 2016-03-15 | 2016-03-15 | Fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205592051U true CN205592051U (en) | 2016-09-21 |
Family
ID=56929705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620197612.9U Expired - Fee Related CN205592051U (en) | 2016-03-15 | 2016-03-15 | Fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205592051U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673280B (en) * | 2016-03-15 | 2018-07-03 | 任一虎 | A kind of fuel nozzle |
| CN111263854A (en) * | 2017-10-23 | 2020-06-09 | 罗伯特·博世有限公司 | Ejector |
-
2016
- 2016-03-15 CN CN201620197612.9U patent/CN205592051U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673280B (en) * | 2016-03-15 | 2018-07-03 | 任一虎 | A kind of fuel nozzle |
| CN111263854A (en) * | 2017-10-23 | 2020-06-09 | 罗伯特·博世有限公司 | Ejector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20190315 |