CN211975248U - Oil sprayer and fuel system with same - Google Patents
Oil sprayer and fuel system with same Download PDFInfo
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- CN211975248U CN211975248U CN202020447532.0U CN202020447532U CN211975248U CN 211975248 U CN211975248 U CN 211975248U CN 202020447532 U CN202020447532 U CN 202020447532U CN 211975248 U CN211975248 U CN 211975248U
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Abstract
The utility model provides a sprayer and have its fuel system. Wherein, the sprayer includes: the fuel injector body is provided with a first oil through cavity, a ventilation cavity and a first injection part, and the ventilation cavity and the first oil through cavity are mutually independent; the air injection needle valve penetrates through the first oil through cavity and the air through cavity, the air injection needle valve comprises a first shaft section, the oil injector has a first working state and a second working state, and when the oil injector is in the first working state, the end part of the first shaft section extends into the first injection part; when the oil sprayer is in a second working state, the end part of the first shaft section avoids the first injection part so that gas is injected from the first injection part, and the gas injection needle valve further comprises an expanding shaft section; when the fuel injector is in the first working state, the cross section of the diameter expanding shaft sectionCross sectional area S1Cross-sectional area S of the first shaft section2Maximum fuel gas rail pressure P in fuel injectorqmaxAnd minimum fuel rail pressure P in the injectoryminSatisfies the following conditions: s1×Pymin＞S2×Pqmax. The utility model provides an among the prior art to the adjustment of gas rail pressure can cause the extravagant problem of the energy.
Description
Technical Field
The utility model relates to a vehicle sprayer technical field particularly, relates to a sprayer and have its fuel system.
Background
At present, in the running process of an engine, the fuel gas rail pressure needs to be adjusted in real time based on the fuel oil rail pressure through a GCM (fuel gas rail pressure control module), namely the fuel gas rail pressure needs to be adjusted in real time along with the fuel oil rail pressure, and the fuel oil rail pressure can be adjusted in real time along with the running condition of the engine. When the rail pressure of the fuel oil is reduced, the fuel gas is released outwards through the GCM module so as to reduce the rail pressure of the fuel gas and avoid the uncontrolled gas injection phenomenon of the fuel injector.
However, the above-mentioned adjustment method of gas rail pressure not only wastes the energy, and pollutes the environment easily, even retrieve the gas to the gas pitcher in, after the gas pitcher internal pressure exceeded gas pitcher safe pressure, the relief valve of gas pitcher still can automatic gassing.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a sprayer and have its fuel system to adjustment to the gas rail pressure can cause the extravagant and polluted environment's of the energy problem among the solution prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a fuel injector including: the fuel injector body is provided with a first oil through cavity, a ventilation cavity and a first injection part, the ventilation cavity and the first oil through cavity are mutually independent, and the ventilation cavity can be communicated with the first injection part; the air injection needle valve is movably arranged in the first oil through cavity and the air through cavity in a penetrating mode, the air injection needle valve comprises a first shaft section located in the air through cavity, the oil injector has a first working state and a second working state, and when the oil injector is in the first working state, the end portion of the first shaft section extends into the first injection portion; when the oil sprayer is in a second working state, the end part of the first shaft section avoids the first injection part so as to inject gas from the first injection part, and the gas injection needle valve further comprises an expanding shaft section positioned in the first oil through cavity; wherein, when the oil injector is in a first working state, the cross-sectional area S of the diameter expanding shaft section1Cross-sectional area S of the first shaft section2Most in the fuel injectorLarge gas rail pressure PqmaxAnd minimum fuel rail pressure P in the injectoryminSatisfies the following relationship: s1×Pymin＞S2×PqmaxTo prevent the end of the first shaft section from disengaging from the first injection portion; the cross sections of the diameter expanding shaft section and the first shaft section are perpendicular to the moving direction of the air injection needle valve.
Furthermore, the air injection needle valve also comprises a second shaft section, and the diameter expanding shaft section is connected with one end of the second shaft section, which is far away from the first shaft section; the second shaft section and the expanding shaft section are coaxially arranged.
Further, the second shaft section and the diameter expanding shaft section are integrally formed.
Further, along the direction of motion of jet-propelled needle valve, first logical oil chamber has the reducing chamber, has the clearance of predetermineeing between the internal surface in reducing chamber and the jet-propelled needle valve.
Further, first shaft segment is the step shaft segment, and the sprayer still includes: the first elastic structure is positioned in the ventilation cavity and connected with the step shaft section so as to apply elastic force moving towards one side of the first spraying part to the step shaft section.
Further, the sprayer body still has the via hole that is used for supplying the jet-propelled needle valve to pass, and the one end and the first oil chamber intercommunication that leads to of via hole, the other end and the chamber intercommunication of ventilating of via hole, the sprayer still includes: and the sealing element is arranged between the through hole and the air injection needle valve so as to seal the through hole.
Further, the end of the first shaft section has a tapered surface to block the first ejection portion by the tapered surface; the outer diameter of the tapered surface is gradually reduced along the direction from the diameter-expanding shaft section to the first shaft section.
Furthermore, the first shaft section is connected with one end, far away from the diameter-expanding shaft section, of the second shaft section, a diameter-reducing step surface is formed between the first shaft section and the second shaft section, the fuel injector body is further provided with a through hole for the air injection needle valve to pass through, and the through hole comprises a conical hole section and a straight hole section which are connected with each other; and in the movement process of the air injection needle valve, the reducing step surface is contacted with the conical hole section and is limited and stopped.
Further, the sprayer body still has second oil cavity, third oil cavity and second injection portion, and the third oil cavity can communicate with second injection portion, and the sprayer still includes: the oil injection needle valve is movably sleeved outside the oil injection needle valve, the oil injector is also provided with a third working state and a fourth working state, and when the oil injector is in the third working state, the end part of the oil injection needle valve extends into the second injection part; when the fuel injector is in the fourth operating state, the end portion of the fuel injection needle valve retreats from the second injection portion so that fuel is injected from the second injection portion.
According to another aspect of the present invention, there is provided a fuel system, comprising a gas supply device, an oil supply device and an oil injector, wherein the gas supply device is communicated with a ventilation cavity of the oil injector to supply fuel gas to the ventilation cavity, and the oil supply device is communicated with a first oil through cavity of the oil injector to supply fuel oil to the first oil through cavity; wherein, the sprayer is the sprayer.
Use the technical scheme of the utility model, the sprayer includes sprayer body and jet-propelled needle valve. The fuel injector body is provided with a first oil through cavity, a ventilation cavity and a first injection part. The air injection needle valve comprises a first shaft section and an expanding shaft section, the first shaft section is located in the ventilation cavity, the expanding shaft section is located in the first oil through cavity, and the air injection needle valve is movably arranged in the first oil through cavity and the ventilation cavity in a penetrating mode. When the fuel injector is in the first working state, no matter how the fuel rail pressure fluctuates, the arrangement of the expanding shaft section can always ensure that the fuel pressure on the air injection needle valve is greater than the fuel pressure, so that accidental air injection caused by the fact that the end part of the first shaft section is separated from the first injection part to be matched is avoided, and the fuel injector can be stably operated in the first working state.
Compare with controlling the gas rail pressure through the GCM module among the prior art, the sprayer in this application utilizes its self structure to avoid the sprayer to take place when being in first operating condition jet needle valve and the phenomenon that first injection portion breaks away from the cooperation, no longer uses the GCM module to adjust the gas rail pressure, and then has solved among the prior art can cause the extravagant and polluted environment's of energy problem to the adjustment of gas rail pressure, has promoted fuel system's feature of environmental protection.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a cross-sectional view of a first embodiment of a fuel injector according to the present invention;
fig. 2 shows a force diagram of a jet needle valve according to a second embodiment of the fuel injector of the present invention; and
fig. 3 shows a force diagram of a jet needle valve according to a third embodiment of the fuel injector of the present invention.
Wherein the figures include the following reference numerals:
10. a fuel injector body; 11. a first oil through cavity; 111. a diameter expanding cavity; 12. a vent lumen; 13. a first injection part; 14. a second oil passage cavity; 15. a second ejection portion; 16. an air intake passage; 18. a third oil chamber; 20. a jet needle valve; 21. a first shaft section; 211. a conical surface; 22. expanding the diameter of the shaft section; 23. a second shaft section; 24. reducing the diameter of the step surface; 30. an oil injection needle valve; 40. a second elastic structure; 50. a cover body; 51. an oil inlet main channel; 52. a first branch channel; 53. a second branch channel.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless otherwise specified, the use of directional words such as "upper and lower" is generally in reference to the orientation shown in the drawings, or to the vertical, perpendicular or gravitational orientation; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself, but the above directional terms are not intended to limit the present invention.
In order to solve the problem that adjustment to gas rail pressure can cause the energy extravagant and polluted environment among the prior art, the application provides a sprayer and have its fuel system.
Example one
As shown in fig. 1, the fuel injector includes an injector body 10 and a jet needle valve 20. The fuel injector body 10 is provided with a first oil through cavity 11, a vent cavity 12 and a first injection part 13, the vent cavity 12 and the first oil through cavity 11 are arranged independently, and the vent cavity 12 can be communicated with the first injection part 13. The air injection needle valve 20 is movably arranged in the first oil through cavity 11 and the air vent cavity 12 in a penetrating mode, the air injection needle valve 20 comprises a first shaft section 21 located in the air vent cavity 12, the oil injector has a first working state and a second working state, and when the oil injector is in the first working state, the end portion of the first shaft section 21 extends into the first injection portion 13; when the injector is in the second operating state, the end of the first shaft section 21 is retracted from the first injection portion 13 to inject gas from the first injection portion 13, and the gas injection needle valve 20 further includes an enlarged diameter shaft section 22 located in the first oil passage chamber 11. Wherein the cross-sectional area S of the enlarged diameter shaft section 22 is such that it is in a first operating state of the injector1The cross-sectional area S of the first shaft section 212Maximum fuel gas rail pressure P in fuel injectorqmaxAnd minimum fuel rail pressure P in the injectoryminSatisfies the following relationship: s1×Pymin＞S2×PqmaxTo prevent the end of the first shaft section 21 from disengaging from the first injection portion 13; the cross sections of the diameter expanding shaft section 22 and the first shaft section 21 are perpendicular to the moving direction of the air injection needle valve 20.
By applying the technical scheme of the embodiment, the fuel injector comprises a fuel injector body 10 and a jet needle valve 20. The injector body 10 has a first oil passage chamber 11, a breather chamber 12, and a first injection portion 13. The air injection needle valve 20 comprises a first shaft section 21 positioned in the air vent cavity 12 and an expanding shaft section 22 positioned in the first oil through cavity 11, and the air injection needle valve 20 is movably arranged in the first oil through cavity 11 and the air vent cavity 12 in a penetrating mode. When the injector is in the first working state, no matter how the fuel rail pressure fluctuates, the arrangement of the expanding shaft section 22 can always ensure that the fuel pressure on the air injection needle valve 20 is greater than the fuel gas pressure, so as to avoid accidental air injection caused by the fact that the end part of the first shaft section 21 is disengaged from the first injection part 13, and further ensure that the injector can stably operate in the first working state.
Compared with the prior art in which the gas rail pressure is controlled by the GCM module, the fuel injector in the embodiment utilizes the structure of the fuel injector to avoid the phenomenon that the gas injection needle valve is separated from the first injection part when the fuel injector is in the first working state, the GCM module is not used for adjusting the gas rail pressure, the problems that the adjustment of the gas rail pressure in the prior art can cause energy waste and pollute the environment are solved, and the environmental protection performance of a fuel system is improved.
In this embodiment, during operation of the injector, the maximum fuel rail pressure P within the injectorqmax30MPa, minimum fuel rail pressure P in the injectoryminIs 10 MPa.
In this embodiment, when the fuel injector is in the first working state, the fuel rail pressure is kept unchanged by the above arrangement of the fuel injector, and the gas release operation is not required, so that the waste of fuel gas and the environmental pollution are avoided. Meanwhile, a GCM module (a fuel gas rail pressure control module) is omitted, so that the cost of the fuel system is reduced, and the failure rate of the fuel system is also reduced.
In the present embodiment, the fuel injector is mainly applied to an HPDI engine (high pressure direct injection gas engine).
In the present embodiment, the air injection needle valve 20 is an integrally formed structure. Therefore, on one hand, the arrangement improves the structural strength of the air injection needle valve 20 and prolongs the service life of the oil injector; on the other hand, the air injection needle valve 20 is easier and simpler to process, and the processing cost and the processing difficulty are reduced.
As shown in fig. 1, the first oil passage chamber 11 has an enlarged diameter chamber 111 in the moving direction of the jet needle valve 20, and a predetermined gap is provided between the inner surface of the enlarged diameter chamber 111 and the jet needle valve 20. Thus, in the process that the jet needle valve 20 slides relative to the injector body 10, the arrangement of the expanding cavity 111 avoids the structural interference between the jet needle valve 20 and the injector body 10 from influencing the normal operation of the injector, and further improves the operation reliability of the injector.
In the present embodiment, the predetermined clearance is small as long as it is ensured that the inner surface of the enlarged diameter chamber 111 does not contact the outer surface of the air injection needle valve 20.
In the present embodiment, the injector body 10 further has a through hole for the gas injection needle 20 to pass through, one end of the through hole communicates with the first oil passing chamber 11, and the other end of the through hole communicates with the vent chamber 12, and the injector further includes a seal member. Wherein the sealing member is disposed between the via hole and the air injection needle valve 20 to seal the via hole. Thus, in the process that the jet needle valve 20 slides relative to the injector body 10, the arrangement of the sealing element can avoid fuel oil from flowing into the ventilation cavity 12 or fuel gas from entering the first oil through cavity 11 to influence the fuel gas rail pressure and the fuel oil rail pressure in the injector, and the normal operation of the injector can be ensured.
Optionally, the sealing element is a rubber ring, and the rubber ring is sleeved outside the air injection needle valve 20.
As shown in fig. 1, the end of the first shaft segment 21 has a tapered surface 211 to block the first ejection portion 13 by the tapered surface 211. The outer diameter of the tapered surface 211 gradually decreases in the direction from the diameter-expanding shaft section 22 to the first shaft section 21. Therefore, the conical surface 211 can prevent the normal operation of the oil sprayer from being influenced by the air leakage phenomenon when the oil sprayer is in the first working state, and the operation reliability of the oil sprayer is improved.
As shown in fig. 1, the injector body 10 further has a second oil-passing chamber 14, a third oil-passing chamber 18, and a second injection portion 15, the third oil-passing chamber 18 being communicable with the second injection portion 15, and the injector further includes an injection needle 30. The injection needle valve 20 is movably sleeved outside the injection needle valve 30, the injector further has a third working state and a fourth working state, and when the injector is in the third working state, the end of the injection needle valve 30 extends into the second injection part 15. When the injector is in the fourth operating state, the end of the fuel injection needle valve 30 avoids the second injection portion 15 to inject fuel from the second injection portion 15. Therefore, the fuel injector has two modes of injecting fuel oil and injecting fuel gas, and in the operation process of the fuel system, the fuel injector firstly injects the fuel oil for ignition and then injects the fuel gas as main fuel for combustion to do work.
As shown in fig. 1, the air injection needle valve 20 is sleeved outside the oil injection needle valve 30, and the two can move relatively to move relative to the injector body 10. The first oil through cavity 11 and the second oil through cavity 14 are arranged independently, and the fuel injector further comprises a cover body 50. The cover 50 has a main oil inlet passage 51, a first branch passage 52, a second branch passage 53, and a third branch passage. The first oil passing chamber 11 is communicated with the oil inlet main passage 51 through a first branch passage 52, the second oil passing chamber 14 is communicated with the oil inlet main passage 51 through a second branch passage 53, and the third oil passing chamber 18 is communicated with the oil inlet main passage 51 through a third branch passage, so that fuel oil is ensured to enter the first oil passing chamber 11, the second oil passing chamber 14 and the third oil passing chamber 18 respectively.
As shown in fig. 1, the injector body 10 also has an intake passage 16. Wherein the ventilation chamber 12 communicates with the air supply through an air inlet passage 16. The first injection portion 13 is an annular vent groove and is located below the intake passage 16.
As shown in fig. 1, the fuel injection needle valve 30 is a stepped shaft section, and the fuel injector further includes a second elastic structure 40. The second elastic structure 40 is located in the injector body 10, and the second elastic structure 40 is connected to the stepped shaft section to apply an elastic force to the stepped shaft section, where the elastic force moves toward the second injection portion 15, so as to ensure that the injection needle valve 30 can block the second injection portion 15 when the injector is in the third operating state.
In this embodiment, the injector body 10 also has an oil through hole, and the injector further includes a solenoid valve assembly and a ball valve. Wherein the solenoid valve assembly is disposed at the top of the cover 50. The ball valve includes a ball body and a ball seat located above the ball body, the ball seat being connected to the solenoid valve assembly to energize the solenoid valve assembly. The electromagnetic valve component drives the ball seat to move towards one side far away from the oil sprayer body, and the ball body is separated from the oil through hole under the action of fuel pressure in the first oil through cavity so that fuel in the first oil through cavity is discharged through the oil through hole, and the oil sprayer is switched to a second working state from the first working state or switched to a fourth working state from the third working state.
Specifically, the injection process of the injector is as follows:
the control system energizes the electromagnetic valve assembly to enable the ball body to be disengaged from the oil through hole, high-pressure fuel oil in the second oil through hole 14 is discharged out of the oil injector body 10 through the oil through hole to achieve pressure relief, and the high-low pressure difference in the oil injector body 10 causes the oil injection needle valve 30 to be acted upwards, so that the oil injection needle valve 30 integrally ascends, and the oil injector starts to inject oil. After the oil injection is finished, the control system cuts off the power of the electromagnetic valve assembly, so that the ball blocks the oil through hole, no pressure difference exists in the oil injector, the second elastic structure 40 applies elastic force to the oil injection needle valve 30, so that the oil injection needle valve 30 blocks the second injection part 15, and the oil injector is in a third working state.
Specifically, the injection process of the fuel injector is as follows:
the control system energizes the electromagnetic valve assembly to enable the ball body to be disengaged from the oil through hole, high-pressure fuel oil in the first oil through hole 11 is discharged out of the fuel injector body 10 through the oil through hole to achieve pressure relief, the high-pressure difference and the low-pressure difference in the fuel injector body 10 cause the air injection needle valve 20 to be subjected to upward acting force, so that the air injection needle valve 20 integrally rises, and the fuel injector starts to inject air. After the air injection is finished, the control system cuts off the power of the electromagnetic valve assembly, so that the ball blocks the oil through hole, no pressure difference exists in the oil injector, resultant force applied to the air injection needle valve 20 faces the first injection part 13, so that the air injection needle valve 20 blocks the first injection part 13, and the oil injector is in a first working state.
In the present embodiment, a limiting portion is disposed on an inner wall of the first oil passing chamber 11, and when the injector is in the second operating state, the limiting portion is used for limiting and stopping the position of the jet needle valve 20 so as to prevent the moving position of the jet needle valve 20 from exceeding the upper limit.
The present application further provides a fuel system (not shown) comprising a gas supply device, an oil supply device and an oil injector, wherein the gas supply device is communicated with the ventilation cavity 12 of the oil injector to supply gas to the ventilation cavity 12, and the oil supply device is communicated with the first oil through cavity 11 of the oil injector to supply oil to the first oil through cavity 11. Wherein, the sprayer is the sprayer. Specifically, the air supply device communicates with the breather chamber 12 through the intake passage 16, and the oil supply device communicates with the first oil-communicating chamber 11, the second oil-communicating chamber 14, and the third oil-communicating chamber 18 through the oil-intake main passage 51.
Example two
The fuel injector in the second embodiment is different from the first embodiment in that: the structure of the air injection needle valve is different.
As shown in fig. 2, the air injection needle valve 20 further includes a second shaft section 23, and the diameter expanding shaft section 22 is connected to an end of the second shaft section 23 away from the first shaft section 21. The second shaft section 23 is arranged coaxially with the expanding shaft section 22. Specifically, the outer diameter of the second shaft section 23 is larger than the outer diameter of the first shaft section 21, that is, in the direction from the diameter-expanding shaft section 22 to the first shaft section 21, the outer diameter of the air injection needle valve 20 is gradually reduced, so that the structural strength of the air injection needle valve 20 is improved, the diameter-expanding shaft section 22 is prevented from being structurally damaged, and the service life of the fuel injector is prolonged.
In the present exemplary embodiment, the second shaft section 23 is formed integrally with the expanding shaft section 22. Therefore, on one hand, the arrangement improves the structural strength of the air injection needle valve 20 and prolongs the service life of the oil injector; on the other hand, the air injection needle valve 20 is easier and simpler to process, and the processing cost and the processing difficulty are reduced.
As shown in fig. 2, the first shaft section 21 is connected to one end of the second shaft section 23 far from the diameter-expanding shaft section 22, a reducing step surface 24 is formed between the first shaft section 21 and the second shaft section 23, and the injector body 10 further has a through hole for the air injection needle valve 20 to pass through, and the through hole includes a tapered hole section and a straight hole section which are connected to each other. During the movement of the air injection needle valve 20, the reducing step surface 24 is contacted with the conical hole section and is limited and stopped. Thus, the taper hole section and the reducing step surface 24 limit and stop to avoid the structure of the first injection part 13 from being damaged due to the fact that the air injection needle valve 20 excessively extrudes the first injection part 13. Meanwhile, the reducing step surface 24 is used for bearing pressure, and the structure damage of the air injection needle valve 20 is avoided.
As shown in fig. 2, the force applied to the air injection needle valve 20 is as follows: f1＝S1×Py，F2＝S2×Pq. Wherein S is1To enlarge the cross-sectional area, S, of the shaft section 222Is the cross-sectional area, P, of the first shaft section 21yIs the fuel rail pressure, P, in the fuel injector body 10qFor combustion in the injector body 10And (5) air rail pressure.
EXAMPLE III
The fuel injector in the third embodiment is different from that in the second embodiment in that: the structure of the fuel injector is different.
As shown in fig. 3, the first shaft section 21 is a stepped shaft section, and the fuel injector further comprises a first resilient structure. Wherein a first elastic structure is located in the vent chamber 12, and the first elastic structure is connected with the stepped shaft section to apply an elastic force moving toward the first injection part 13 side to the stepped shaft section. Thus, when the fuel injector is in the first working state, the arrangement of the first elastic structure ensures that the air injection needle valve 20 can block the first injection part 13, so that fuel gas injection is avoided, and the operation reliability of the fuel injector is improved.
As shown in fig. 3, the force applied to the air injection needle valve 20 is as follows: f1＝S1×Py，F2+F4＝S2×Vq. Wherein S is1To enlarge the cross-sectional area, S, of the shaft section 222Is the cross-sectional area, P, of the first shaft section 21yIs the fuel rail pressure, P, in the fuel injector body 10qFor the gas rail pressure in the injector body 10, F3Is an elastic force.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
the fuel injector comprises a fuel injector body and a jet needle valve. The fuel injector body is provided with a first oil through cavity, a ventilation cavity and a first injection part. The air injection needle valve comprises a first shaft section and an expanding shaft section, the first shaft section is located in the ventilation cavity, the expanding shaft section is located in the first oil through cavity, and the air injection needle valve is movably arranged in the first oil through cavity and the ventilation cavity in a penetrating mode. When the fuel injector is in the first working state, no matter how the fuel rail pressure fluctuates, the arrangement of the expanding shaft section can always ensure that the fuel pressure on the air injection needle valve is greater than the fuel pressure, so that accidental air injection caused by the fact that the end part of the first shaft section is separated from the first injection part to be matched is avoided, and the fuel injector can be stably operated in the first working state.
Compare with controlling the gas rail pressure through the GCM module among the prior art, the sprayer in this application utilizes its self structure to avoid the sprayer to take place when being in first operating condition jet needle valve and the phenomenon that first injection portion breaks away from the cooperation, no longer uses the GCM module to adjust the gas rail pressure, and then has solved among the prior art can cause the extravagant and polluted environment's of energy problem to the adjustment of gas rail pressure, has promoted fuel system's feature of environmental protection.
It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fuel injector, characterized by comprising:
the fuel injector comprises a fuel injector body (10) which is provided with a first fuel passing cavity (11), a ventilation cavity (12) and a first injection part (13), wherein the ventilation cavity (12) and the first fuel passing cavity (11) are mutually independent, and the ventilation cavity (12) can be communicated with the first injection part (13);
the air injection needle valve (20) is movably arranged in the first oil through cavity (11) and the ventilation cavity (12) in a penetrating mode, the air injection needle valve (20) comprises a first shaft section (21) located in the ventilation cavity (12), the oil injector has a first working state and a second working state, and when the oil injector is in the first working state, the end portion of the first shaft section (21) extends into the first injection portion (13); when the injector is in the second working state, the end part of the first shaft section (21) avoids the first injection part (13) so as to inject gas from the first injection part (13), and the gas injection needle valve (20) further comprises a diameter expanding shaft section (22) positioned in the first oil through cavity (11);
wherein the cross-sectional area S of the expanding shaft section (22) is such that it is in the first operating state1The cross-sectional area S of the first shaft section (21)2Maximum fuel gas rail pressure P in the fuel injectorqmaxAnd a minimum fuel rail pressure P in said injectoryminSatisfies the following relationship: s1×Pymin＞S2×PqmaxTo prevent the end of the first shaft section (21) from disengaging from the first injection portion (13); the cross sections of the diameter expanding shaft section (22) and the first shaft section (21) are perpendicular to the moving direction of the air injection needle valve (20).
2. The fuel injector as claimed in claim 1, characterized in that the jet needle valve (20) further comprises a second shaft section (23), and the expanding shaft section (22) is connected with one end of the second shaft section (23) far away from the first shaft section (21); the second shaft section (23) and the expanding shaft section (22) are coaxially arranged.
3. Fuel injector according to claim 2, characterized in that the second axial section (23) is made in one piece with the expanding axial section (22).
4. The fuel injector as claimed in claim 1, characterized in that the first oil through cavity (11) has a diameter expanding cavity (111) in a moving direction of the jet needle valve (20), and a preset clearance is provided between an inner surface of the diameter expanding cavity (111) and the jet needle valve (20).
5. Fuel injector according to claim 1, characterized in that the first shaft section (21) is a stepped shaft section, the fuel injector further comprising:
a first elastic structure located within the vent chamber (12), the first elastic structure being connected with the stepped shaft section to apply an elastic force to the stepped shaft section moving toward a side of the first injection part (13).
6. Injector according to claim 1, characterized in that the injector body (10) further has a through hole for the passage of the jet needle valve (20), one end of the through hole communicating with the first vent chamber (11) and the other end of the through hole communicating with the vent chamber (12), the injector further comprising:
the sealing element is arranged between the via hole and the air injection needle valve (20) so as to seal the via hole.
7. A fuel injector according to claim 1, characterized in that an end portion of the first shaft section (21) has a tapered surface (211) to block the first injection portion (13) by the tapered surface (211); the outer diameter of the tapered surface (211) is gradually reduced in the direction from the diameter-expanding shaft section (22) to the first shaft section (21).
8. The fuel injector as claimed in claim 2, characterized in that the first shaft section (21) is connected with one end of the second shaft section (23) far away from the expanding shaft section (22), a reducing step surface (24) is formed between the first shaft section (21) and the second shaft section (23), the fuel injector body (10) is further provided with a through hole for the air injection needle valve (20) to pass through, and the through hole comprises a conical hole section and a straight hole section which are connected with each other; in the moving process of the air injection needle valve (20), the reducing step surface (24) is in contact with the conical hole section and is limited and stopped.
9. A fuel injector as claimed in claim 1, characterized in that the injector body (10) further has a second oil-passing chamber (14), a third oil-passing chamber (18) and a second injection portion (15), the third oil-passing chamber (18) being communicable with the second injection portion (15), the fuel injector further comprising:
the oil injection needle valve (30) is movably sleeved outside the oil injection needle valve (30), the oil injector further has a third working state and a fourth working state, and when the oil injector is in the third working state, the end part of the oil injection needle valve (30) extends into the second injection part (15); when the fuel injector is in the fourth working state, the end part of the fuel injection needle valve (30) avoids the second injection part (15) so that fuel is injected from the second injection part (15).
10. A fuel system is characterized by comprising a gas supply device, a fuel supply device and a fuel injector, wherein the gas supply device is communicated with a ventilation cavity (12) of the fuel injector so as to supply fuel gas to the ventilation cavity (12), and the fuel supply device is communicated with a first fuel through cavity (11) of the fuel injector so as to supply fuel oil to the first fuel through cavity (11); wherein the fuel injector is a fuel injector according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020447532.0U CN211975248U (en) | 2020-03-31 | 2020-03-31 | Oil sprayer and fuel system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020447532.0U CN211975248U (en) | 2020-03-31 | 2020-03-31 | Oil sprayer and fuel system with same |
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| Publication Number | Publication Date |
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| CN211975248U true CN211975248U (en) | 2020-11-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324796A (en) * | 2022-09-21 | 2022-11-11 | 一汽解放汽车有限公司 | Fuel injector and internal combustion engine |
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2020
- 2020-03-31 CN CN202020447532.0U patent/CN211975248U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324796A (en) * | 2022-09-21 | 2022-11-11 | 一汽解放汽车有限公司 | Fuel injector and internal combustion engine |
| CN115324796B (en) * | 2022-09-21 | 2023-07-18 | 一汽解放汽车有限公司 | Fuel injector and internal combustion engine |
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