CN204126790U - A kind of high pressure common rail injector - Google Patents
A kind of high pressure common rail injector Download PDFInfo
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- CN204126790U CN204126790U CN201420496309.XU CN201420496309U CN204126790U CN 204126790 U CN204126790 U CN 204126790U CN 201420496309 U CN201420496309 U CN 201420496309U CN 204126790 U CN204126790 U CN 204126790U
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- needle
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- oil
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Abstract
The utility model relates to a kind of high pressure common rail injector.It comprises injector body, injector body is provided with solenoid valve from top to bottom successively, control valve body, intermediate, needle-valve body and helmet, described solenoid valve is arranged on the middle part of described injector body with upper/lower positions, needle-valve is provided with in described needle-valve body, described needle-valve body is provided with pressure-bearing room, the lower end of described needle-valve body is provided with nozzle opening, the top of described needle-valve is provided with pressure controling chamber, described pressure controling chamber is formed by the top of sleeve and needle-valve, control valve rod is provided with in described control valve body, the described upper end of control valve rod is connected with the spool of solenoid valve, the periphery of described control valve rod is provided with ring cavity, described pressure controling chamber is provided with oil input channel and oil road, described oil input channel is communicated with oil inlet pipe, described oil road is communicated with ring cavity.The utility model pressure controling chamber volume reduces, and pressure change rate is high, and be set effective under solenoid valve and improve needle-valve speed of response, oil sprayer entire outer diameter size is little, has better adaptability.
Description
Technical field
The utility model relates to a kind of oil sprayer, particularly relates to a kind of high pressure common rail injector.
Background technique
High pressure common rail injector is parts most crucial in common rail system, and the structure of oil sprayer inside, working principle have a great impact the responsiveness of oil sprayer, reliability and durability, in traditional common-rail injector, high pressure sealing is realized by solenoid valve initial tension of spring, and along with oil sprayer technology is to high rail pressure, the development of high injection pressure, because the control valve rod be connected with spring bears larger axial force, just need sizable solenoid valve initial tension of spring just can reach the effect of high pressure sealing, after solenoid valve powers up, need larger electromagnetic force just can overcome the pretightening force band brake control valve bar action of spring thereupon, this just determines solenoid valve size and oil injector body size is larger, the reliability of solenoid valve is caused to decline, especially at some engine cylinder cover limited spaces, the oil sprayer mounting arrangement difficulty causing volume excessive obviously, in addition because the control valve rod in existing oil sprayer is by responsive to axial force, need the electromagnetic force of solenoid valve large, cause the size of solenoid valve large, therefore solenoid valve is generally up-set type, be arranged on the apical position of oil sprayer, cause the distance of the control valve rod of solenoid valve and Hydrauservo System very large, Hydrauservo System comprises: pressure controling chamber, needle-valve body pressure-bearing room, needle-valve etc., be stressed control room and the distance between control valve valve rod and Hydrauservo System of speed of response due to oil-fuel injector needle-valve affects larger, the volume of adding the pressure controling chamber of existing oil sprayer is large, can produce pressure retarded, affect the speed of response of needle-valve, cause common rail system responsiveness poor.
Model utility content
The deficiency that the utility model exists for above-mentioned prior art, provides a kind of high pressure common rail injector, which solves existing oil sprayer responsiveness, poor reliability and comparatively large for meeting high rail pressure, high eject request size, not easily the problem such as installation.
The technological scheme that the utility model solves the problems of the technologies described above is as follows: a kind of high pressure common rail injector, comprise injector body, described injector body is provided with solenoid valve from top to bottom successively, control valve body, intermediate, needle-valve body and helmet, described solenoid valve comprises spool and solenoid valve spring, described injector body is provided with and runs through described control valve body, intermediate, the oil inlet pipe of needle-valve body, needle-valve is provided with in described needle-valve body, described needle-valve is provided with reducing frustum, pressure-bearing room is provided with along described reducing frustum periphery in described needle-valve body, the lower end of described needle-valve body is provided with nozzle opening, described pressure-bearing room is communicated with described oil inlet pipe, the top of described needle-valve is provided with pressure controling chamber, described pressure controling chamber is formed by the top of sleeve and needle-valve, the top of described needle-valve is provided with shoulder, needle valve spring is provided with between the bottom of described sleeve and described shoulder, control valve rod is provided with in described control valve body, the upper end of described control valve rod is connected with described spool, the bottom of described control valve body is provided with oil-return groove, sealing surface is formed between the lower end of described oil-return groove and described control valve rod, ring cavity is provided with in the periphery of described control valve rod lower end, described pressure controling chamber is provided with oil input channel and oil road, described oil input channel is communicated with oil inlet pipe, described oil road is communicated with described ring cavity.
Described solenoid valve is arranged on the position at below the middle part of described injector body.Shorten the distance controlled between valve rod and Hydrauservo System, effectively improve the speed of response of needle-valve.
Described oil input channel comprises large oil input channel, and the upper end of described large oil input channel is communicated with the oil inlet pipe of described injector body by the first groove be arranged on described control valve body lower surface, and lower end is communicated with described pressure controling chamber.Increase the oil inlet quantity of pressure controling chamber.
Described oil input channel also comprises little oil input channel, and the lower end of described little oil input channel is communicated with the oil inlet pipe of described injector body, and upper end is communicated with described oil road by the second groove of described intermediate upper surface.Reduce pressure surge, reduce the needle-valve closedown response time.
Forming sealing surface between the lower end of described oil-return groove and described control valve rod is the conical surface or sphere.Good sealing effect.
Described control valve body is provided with inclined hole, and described oil road is communicated with ring cavity by described inclined hole.
Described needle valve spring is fixed on described needle-valve by spring seat.
The beneficial effects of the utility model are: in the utility model, oil sprayer is by being arranged on the ring cavity design controlling stem outer circumference, the high pressure fuel entered in ring cavity is made only to produce radial force to control valve rod, control valve rod is not subject to the axial force from high pressure fuel, control valve is made to have the effect of equilibrium valve, only need very little solenoid valve initial tension of spring just can realize high pressure sealing, when solenoid valve powers up, solenoid valve only needs to produce corresponding less electromagnetic force and overcomes solenoid valve initial tension of spring, the corresponding reduction of demand of the electromagnetic force of solenoid valve, it is very little that the boundary dimension of solenoid valve just can be done, oil sprayer external diameter also reduces thereupon, and can accomplish, lower external diameter is consistent, such as: be less than in the middle-size and small-size motor of 100mm at cylinder diameter, because engine cylinder cover limited space only can use external diameter to be less than or equal to the common-rail injector of φ 19mm, existing common-rail injector is by solenoid valve size restrictions, external diameter is generally greater than φ 25mm, cannot use, and the utility model is based on less solenoid valve size, the outside dimension being used in the common-rail injector of above-mentioned middle-size and small-size motor can be accomplished to be less than or equal to φ 19mm easily, and top is the same with lower outer diameter.Therefore, for some engine cylinder cover limited spaces, when adopting conventional fuel injector difficult arrangement, the utility model oil sprayer has better adaptability, in addition the reduction of solenoid valve load, also effectively improves the reliability of system, durability, the size of solenoid valve of the present utility model is little, the bottom of injector body can be arranged on, solenoid valve of the present utility model is underneath type, position below the middle part being arranged on described injector body, shorten the distance controlling valve rod and Hydrauservo System, the distance of the distance or pressure controling chamber and needle-valve body pressure-bearing room that control valve rod and pressure controling chamber in tradition common-rail injector accounts for 2/3 of whole oil sprayer overall length, and the wherein one that can only reduce in above-mentioned two kinds of distances, and the utility model can significantly reduce simultaneously both distance: the distance reducing to control valve rod and pressure controling chamber realizes by the thickness changing intermediate, pressure controling chamber is inherently positioned at needle-valve body, itself and needle-valve body pressure-bearing room distance decide according to the length of needle-valve, be positioned at the reduction of the solenoid valve of injector body bottom and the volume of pressure controling chamber just, effective reduction oil sprayer is pressure retarded, effectively improve needle-valve speed of response, improve systematic function.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is partial enlargement structural representation of the present utility model;
In figure: 1, solenoid valve; 2, control valve body; 3, intermediate; 4, needle-valve body; 5, helmet; 6, needle-valve; 7, injector body; 8, solenoid valve spring; 9, valve rod is controlled; 10, sleeve; 11, needle valve spring; 12, spring seat; 13, oil inlet pipe; 14, the second groove; 15, little oil inlet pipe; 16, large oil inlet pipe; 17, ring cavity; 18, inclined hole; 19, oil-return groove; 20, oil road; 21, nozzle opening; 22, pressure-bearing room; 23, pressure controling chamber; 24, the first groove; 25, reducing frustum; 26. sealing surfaces.
Embodiment
Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As depicted in figs. 1 and 2, a kind of high pressure common rail injector, comprise injector body 7, described injector body 7 is provided with solenoid valve 1 from top to bottom successively, control valve body 2, intermediate 3, needle-valve body 4 and helmet 5, described solenoid valve 1 comprises spool and solenoid valve spring, described injector body is provided with and runs through described control valve body 2, intermediate 3, the oil inlet pipe 13 of needle-valve body 4, needle-valve 6 is provided with in described needle-valve body 4, described needle-valve 6 is provided with reducing frustum 25, pressure-bearing room 22 is provided with along described reducing frustum 25 periphery in described needle-valve body 4, the lower end of described needle-valve body is provided with nozzle opening 21, described pressure-bearing room 22 is communicated with described oil inlet pipe 13, the top of described needle-valve is provided with pressure controling chamber 23, described pressure controling chamber 23 is formed by the top of sleeve 10 and needle-valve, the top of described needle-valve is provided with shoulder, needle valve spring 11 is provided with between the bottom and described shoulder of described sleeve 10, be provided with in described control valve body 2 and control valve rod 9, the upper end of described control valve rod 9 is connected with described spool, the bottom of described control valve body 2 is provided with oil-return groove 19, sealing surface 26 is formed between the lower end of described oil-return groove 19 and described control valve rod 9, ring cavity 17 is provided with in the periphery of described control valve rod 9 lower end, described pressure controling chamber 23 is provided with oil input channel and oil road 20, described oil input channel is communicated with oil inlet pipe 13, described oil road 20 is communicated with described ring cavity 17.
Described solenoid valve 1 is arranged on the middle part of described injector body 7 with upper/lower positions.Shorten and control the distance between valve rod 9 and pressure controling chamber 23 and the distance between pressure controling chamber 23 and pressure-bearing room 22, effectively improve the speed of response of needle-valve 6.
Described oil input channel comprises large oil input channel 16, and the upper end of described large oil input channel 16 is communicated with the oil inlet pipe 13 of described injector body by the first groove 24 be arranged on described control valve body lower surface, and lower end is communicated with described pressure controling chamber 23.
Described oil input channel also comprises little oil input channel 15, and the described lower end of little oil input channel 15 is communicated with the oil inlet pipe 13 of described injector body, and upper end is communicated with described oil road 20 by the second groove 14 of described intermediate upper surface.
Sealing surface 26 is formed for the conical surface or sphere between the lower end of described oil-return groove 19 and described control valve rod 9.
The low side of described control valve rod 9 is provided with drainage end, and described drainage end is hemisphere.Hemisphere mainly plays drainage to high pressure fuel.
Described control valve body is provided with inclined hole 18, and described oil road is communicated with ring cavity 17 by described inclined hole 18.
Described needle valve spring 11 is fixed on the shoulder of described needle-valve by spring seat 12.
Ring cavity 17 of the present utility model is arranged on the periphery of described control valve rod 9, ring cavity inner high voltage fuel oil only has radial force to control valve rod 9, there is no axial force, so the sealing controlled between valve rod and oil-return groove only needs less solenoid valve initial tension of spring, when solenoid valves, the electromagnetic force controlling valve rod powered magnet valve promote and on when moving, the electromagnetic spring pretightening force that electromagnetic force will overcome is less, what so the electromagnetic force of solenoid valve needed is also very little, just mean that solenoid valve can make small size, and the external diameter of oil sprayer is by the impact of solenoid valve size, therefore oil sprayer also can make less external diameter, conveniently on engine cylinder cover, carry out layout, the size of solenoid valve of the present utility model is little, and the upper and lower external diameter that can realize injector body is consistent, be arranged on by solenoid valve with upper/lower positions in the middle part of injector body, the underlying of solenoid valve shortens the distance controlled between valve rod and Hydrauservo System, effectively improves the speed of response of needle-valve 6.And pressure controling chamber of the present utility model, jacket casing is connected on the top of needle-valve, the inwall in its mineralization pressure control room, the diameter at needle-valve top is the diameter of pressure controling chamber, the distance that needle-valve moves is the height of pressure controling chamber, the distance that the diameter at needle-valve top and needle-valve move constitutes less volume pressure control room, thus reaches the pressure change rate increasing pressure controling chamber, is beneficial to the object of the speed of response promoting needle-valve.
The utility model is when closed electromagnetic valve, High Pressure is in the pressure controling chamber at needle-valve top, onesize fuel pressure also acts on the pressure-bearing room in the middle part of needle-valve, the zero pressure difference formed due to the fuel pressure of pressure controling chamber and pressure-bearing room makes needle valve spring keep needle-valve to close, namely during solenoid valve no electric circuit, oil sprayer not oil spout.When giving solenoid valves, control valve rod promotes and makes it depart from oil-return groove under the electromagnetic force of solenoid valve, the fuel oil of ring cavity is released by oil-return groove and returns fuel tank, because pressure controling chamber passes through oil road, inclined hole is communicated with ring cavity, along with the fuel oil of ring cavity releases, oil road, the pressure of pressure controling chamber reduces, when the pressure of Stress control indoor is enough to open needle-valve lower than the pressure difference of needle-valve pressure-bearing room, needle valve pressed shortening valve spring moves, fuel oil is then sprayed by nozzle opening, when the electric current in electromagnetic valve coil is down to zero, solenoid valve initial tension of spring makes control valve rod be returned to and oil-return groove sealing state, when pressure increase in pressure controling chamber is to pressure slightly larger than pressure-bearing surface place bottom needle-valve, just needle-valve closes nozzle opening, oil spout stops immediately.Needle valve spring 11 contributes to closing needle-valve, particularly when oily rail pressure is lower.
The middle part of the utility model oil sprayer described injector body because solenoid valve is arranged on, with upper/lower positions, makes the mounting point and the nozzle opening that control valve rod very close, therefore the liter of needle-valve falls minimum with the opening and closing time delay of control valve rod.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. a high pressure common rail injector, comprise injector body, described injector body is provided with solenoid valve from top to bottom successively, control valve body, intermediate, needle-valve body and helmet, described solenoid valve comprises spool and solenoid valve spring, described injector body is provided with and runs through described control valve body, intermediate, the oil inlet pipe of needle-valve body, needle-valve is provided with in described needle-valve body, described needle-valve is provided with reducing frustum, pressure-bearing room is provided with along the periphery of described reducing frustum in described needle-valve body, described pressure-bearing room is communicated with described oil inlet pipe, the lower end of described needle-valve body is provided with nozzle opening, the top of described needle-valve is provided with pressure controling chamber, it is characterized in that, described pressure controling chamber is formed by the top of sleeve and needle-valve, the top of described needle-valve is provided with shoulder, needle valve spring is provided with between the bottom of described sleeve and described shoulder, control valve rod is provided with in described control valve body, the upper end of described control valve rod is connected with described spool, the bottom of described control valve body is provided with oil-return groove, sealing surface is formed between described oil-return groove and described control valve rod, ring cavity is provided with in the periphery of described control valve rod lower end, described pressure controling chamber is provided with oil input channel and oil road, described oil input channel is communicated with oil inlet pipe, described oil road is communicated with described ring cavity.
2. high pressure common rail injector according to claim 1, it is characterized in that, described oil input channel comprises large oil input channel, the upper end of described large oil input channel is communicated with the oil inlet pipe of described injector body by the first groove be arranged on described control valve body lower surface, and lower end is then communicated with described pressure controling chamber.
3. high pressure common rail injector according to claim 1, it is characterized in that, described oil input channel also comprises little oil input channel, and the lower end of described little oil input channel is communicated with the oil inlet pipe of described injector body, and upper end is communicated with described oil road by the second groove of described intermediate upper surface.
4. the high pressure common rail injector according to any one of claims 1 to 3, is characterized in that, forming sealing surface between the lower end of described oil-return groove and described control valve rod is the conical surface or sphere.
5. the high pressure common rail injector according to any one of claims 1 to 3, is characterized in that, described control valve body is provided with inclined hole, and described oil road is communicated with ring cavity by described inclined hole.
6. the high pressure common rail injector according to any one of claims 1 to 3, is characterized in that, described needle valve spring is fixed on the shoulder of described needle-valve by spring seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420496309.XU CN204126790U (en) | 2014-08-29 | 2014-08-29 | A kind of high pressure common rail injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420496309.XU CN204126790U (en) | 2014-08-29 | 2014-08-29 | A kind of high pressure common rail injector |
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| Publication Number | Publication Date |
|---|---|
| CN204126790U true CN204126790U (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420496309.XU Withdrawn - After Issue CN204126790U (en) | 2014-08-29 | 2014-08-29 | A kind of high pressure common rail injector |
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| CN (1) | CN204126790U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196665A (en) * | 2014-08-29 | 2014-12-10 | 龙口龙泵燃油喷射有限公司 | High-pressure common rail oil sprayer |
-
2014
- 2014-08-29 CN CN201420496309.XU patent/CN204126790U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196665A (en) * | 2014-08-29 | 2014-12-10 | 龙口龙泵燃油喷射有限公司 | High-pressure common rail oil sprayer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150128 Effective date of abandoning: 20170623 |