CN220415563U - Electric control fuel injector with variable needle valve opening speed - Google Patents
Electric control fuel injector with variable needle valve opening speed Download PDFInfo
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- CN220415563U CN220415563U CN202321237675.9U CN202321237675U CN220415563U CN 220415563 U CN220415563 U CN 220415563U CN 202321237675 U CN202321237675 U CN 202321237675U CN 220415563 U CN220415563 U CN 220415563U
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- 239000000446 fuel Substances 0.000 title claims abstract description 48
- 238000009825 accumulation Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000002828 fuel tank Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 106
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010710 diesel engine oil Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses an electric control fuel injector with a variable needle valve opening rate, which comprises an upper fastening cap, a lower shell, a nozzle valve body, a solenoid valve assembly, a needle valve and a control oil way, wherein two ends of a first layer valve body are respectively fixedly connected with the upper fastening cap and the lower shell, and the lower end of the first layer valve body, the second layer valve body, the fifth layer valve body and the nozzle valve body are sequentially embedded into the lower shell from top to bottom. The bottom of the electromagnetic valve component is supported on the nozzle valve body, the needle valve vertically penetrates through the second vertical hole downwards and then is supported in the lower end of the nozzle valve body, the lower end of the first vertical hole is connected with the upper end of the second vertical hole through a control oil way, and the control oil way is also connected with the high-pressure oil way, the electromagnetic valve component and the upper end of the needle valve. The utility model meets the requirements of different working conditions of the diesel engine, and further improves the economic performance, the power performance and the emission performance of the diesel engine.
Description
Technical Field
The utility model relates to a diesel engine oil sprayer, in particular to an electric control oil sprayer capable of changing oil spraying rate, and belongs to the technical field of diesel engines.
Background
The optimizing of the combustion process of the diesel engine is a crucial measure for reducing the pollution emission of the diesel engine and improving the performance of the diesel engine, and the electric control fuel injector is used as one of the most critical and complex components in the electric control fuel injection system of the diesel engine, so that the control precision of the electric control fuel injector can be improved, a flexible control mode is realized, and the working performance of the diesel engine can be obviously influenced.
The electronic control fuel injector needs to be adjusted according to the working condition characteristics and performance requirements of the whole diesel engine, for example, under the working condition of high power and high rotation speed which is more than 50% of rated power and the rotation speed is 1000-2000 r/min, a large amount of fuel is required to be injected into the cylinder of the diesel engine in a short time to ensure the power performance of the diesel engine. The existing fuel injector is often used for improving the oil return rate by increasing the diameter of the oil return hole of the control cavity, so that the needle valve opening rate is further accelerated. However, under the working conditions of low power and low rotation speed, the rated power is less than 50 percent, and the rotation speed is 300-1000 r/min, the oil return amount is increased due to the larger oil return rate of the control cavity, so that the economy of the whole diesel engine is reduced, and an electric control oil sprayer capable of adjusting the opening rate of the needle valve is needed to optimize the combustion condition of a diesel engine cylinder, further reduce the oil consumption, reduce the emission of particulate matters and improve the economic and technical performances of the diesel engine.
Disclosure of Invention
The utility model aims to provide an electric control fuel injector with a compact structure and a variable needle valve opening rate, which can adjust a fuel injection rule according to the injection requirement of a diesel engine.
The utility model is realized by the following technical scheme:
the electric control fuel injector comprises an upper fastening cap, a lower shell, a first layer valve body, a second layer valve body, a third layer valve body, a fourth layer valve body, a fifth layer valve body, a nozzle valve body, a solenoid valve assembly, a needle valve and a control oil way, wherein the upper end and the lower end of the first layer valve body are respectively in threaded connection with the lower end of the upper fastening cap and the upper end of the lower shell, the top surface of the first layer valve body is abutted against the bottom surface of a threaded hole of the upper fastening cap, the bottom surface of the first layer valve body is abutted against the top surface of the second layer valve body, the third layer valve body, the fourth layer valve body, the fifth layer valve body and the nozzle valve body are sequentially embedded into the lower shell from top to bottom and are in clearance fit with the lower shell, and the lower end of the nozzle valve body penetrates out of the lower end of the lower shell; the first-layer valve body is a cylindrical body provided with an accumulation cavity, and high-pressure fuel of 16-22 Mpa enters the accumulation cavity of the first-layer valve body through a high-pressure fuel input connector and a high-pressure fuel hole in the center of the top end of the upper fastening cap; sealing rings are respectively embedded in the top surfaces of the first-layer valve body, the second-layer valve body, the third-layer valve body, the fourth-layer valve body and the fifth-layer valve body, the top surface of the nozzle valve body and the central ring surface; the upper end of the electromagnetic valve assembly is embedded in the lower end of the second-layer valve body, and the lower end of the electromagnetic valve assembly vertically and downwards sequentially passes through the first vertical holes of the third-layer valve body, the fourth-layer valve body and the fifth-layer valve body and then is supported on the top surface of the nozzle valve body; the needle valve vertically and downwards sequentially passes through the center of the fifth-layer valve body and a second vertical hole in the center of the nozzle valve body and then is supported in the lower end of the nozzle valve body, and the lower end of the first vertical hole is connected with the upper end of the second vertical hole through a control oil way so as to connect the upper end of the needle valve with the lower end of the electromagnetic valve assembly; the upper end of the needle valve is sleeved with a needle valve reset spring, the lower end of the needle valve penetrates through the cavity at the lower part of the nozzle valve body, and the end head of the lower end of the needle valve is propped against the inner conical surface of the cavity at the lower part of the nozzle valve body; the upper end of a high-pressure oil duct with the oil pressure of 16-32 Mpa is connected with the bottom of the pressure accumulation cavity, and the lower end of the high-pressure oil duct sequentially penetrates through the second-layer valve body, the third-layer valve body, the fourth-layer valve body, the fifth-layer valve body and the lower cavity of the nozzle valve body downwards to be connected; the control oil way is also connected with the high-pressure oil way, the electromagnetic valve component and the upper end of the needle valve.
The object of the present utility model can be further achieved by the following technical means.
Further, the electromagnetic valve assembly comprises an annular electromagnet, an armature, an upper valve rod, a middle valve core, an upper valve rod reset spring and a middle valve core reset spring, wherein the electromagnet is embedded into a counter bore at the lower end of the second-layer valve body, the armature is embedded into a counter bore at the upper end of the third-layer valve body and is fixed on the top end of the upper valve rod, and the electromagnet and the upper valve rod are adjacent up and down; the upper valve rod reset spring is positioned in the central hole of the electromagnet, and two ends of the upper valve rod reset spring respectively lean against the counter bore at the lower end of the second-layer valve body and the top end of the armature; the middle valve core is sleeved on the middle part of the upper valve rod and embedded in a counter bore at the lower end of the third layer valve body, the middle valve core reset spring is sleeved at the upper end of the middle valve core, the bottom end of the upper valve rod sequentially penetrates through the fourth layer valve body and the fifth layer valve body and is supported on the top surface of the nozzle valve body; the middle part of the high-pressure oil channel, the lower end of the upper valve rod and the upper end of the needle valve are connected through a control oil way.
Further, the control oil way comprises a high-pressure cavity oil inlet orifice, a control cavity oil inlet orifice, an upper oil return orifice, a lower oil return orifice, an upper valve rod lower ring groove and an upper valve rod bottom ring groove, the upper end of the obliquely arranged high-pressure cavity oil inlet orifice is connected with a high-pressure oil channel penetrating through the bottom of the third-layer valve body, the lower end of the high-pressure cavity oil inlet orifice is communicated with one side of the upper valve rod lower ring groove, the other side of the upper valve rod lower ring groove is communicated with the control cavity on the upper side of the top end of the needle valve through the control cavity oil inlet orifice obliquely arranged on the fourth-layer valve body, and the control cavity is positioned at the upper end of the vertical hole of the fifth-layer valve body; the upper oil return throttle hole and the lower oil return throttle hole which are arranged at intervals up and down transversely penetrate through the control cavity and one side of the first vertical hole, a first horizontal oil return hole at the other side of the first vertical hole is vertically intersected with one end of a second horizontal oil return hole, and the other end of the second horizontal oil return hole is communicated with the fuel tank through an oil return port joint and an oil return pipe; the diameters of the first horizontal oil return holes and the second horizontal oil return holes are the same.
Further, the distance A between the upper side bus of the upper oil return throttle hole and the lower side bus of the lower oil return throttle hole is smaller than the width B of the bottom ring groove of the upper valve rod, and the distance C=0.5-1.0 mm between the upper edge of the bottom ring groove of the upper valve rod and the lower side bus of the lower oil return throttle hole.
Furthermore, the nozzle valve body is a stepped shaft body, a hemispherical nozzle with a pressure cavity is downwards extended from the bottom end of the stepped shaft body, and a plurality of oil spray holes are uniformly distributed on the hemispherical nozzle.
The utility model adopts the structure of the multilayer valve body, the electromagnetic valve component, the needle valve and the middle valve core, and utilizes the current magnitude of the input electromagnet to generate different electromagnetic forces to adjust the oil return rate of the high-pressure fuel in the control cavity, thereby realizing the variable oil injection rule. The oil inlet and the oil return of the control cavity are controlled through the on-off relation between the annular groove at the lower part of the upper valve rod and the oil inlet orifice of the high-pressure cavity and the oil inlet orifice of the control cavity and the on-off relation between the annular groove at the bottom of the upper valve rod and the oil return orifice of the upper oil return orifice and the oil return orifice of the lower oil return orifice when the upper valve rod is lifted, so that the fuel injection rate is regulated by regulating the opening position of the needle valve, different working condition demands of a diesel engine are met, and the economic performance, the power performance and the emission performance of the diesel engine are improved.
Advantages and features of the utility model will be illustrated and explained by the following non-limiting description of preferred embodiments, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is an enlarged view of section I of FIG. 1;
fig. 3 is an enlarged sectional view of A-A of fig. 1.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
In the description of the present utility model, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like, which indicate an orientation or a positional relationship, are based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device in question must have a particular orientation.
As shown in fig. 1 to 3, the present embodiment includes an upper fastening cap 1, a lower housing 2, a first layer valve body 3, a second layer valve body 4, a third layer valve body 5, a fourth layer valve body 6, a fifth layer valve body 7, a nozzle valve body 8, a solenoid valve assembly 9, a needle valve 10, and a control oil passage 20, the upper and lower ends of the first layer valve body 3 are respectively screwed with the lower end of the upper fastening cap 1 and the upper end of the lower housing 2, the top surface of the first layer valve body 3 abuts against the bottom surface of the upper fastening cap threaded hole 11, the bottom surface of the first layer valve body 3 abuts against the top surface of the second layer valve body 4, the third layer valve body 5, the fourth layer valve body 6, the fifth layer valve body 7, and the nozzle valve body 8 abutting against each other are sequentially embedded in the lower housing 2 from top to bottom, and are in clearance fit with the lower housing 2, and the lower end of the nozzle valve body 8 penetrates the lower end of the lower housing 2. The first-layer valve body 3 is a cylindrical body provided with a pressure accumulation cavity 31, and high-pressure fuel of 16-32 Mpa enters the pressure accumulation cavity 31 of the first-layer valve body 3 through a high-pressure fuel input joint 12 and a high-pressure fuel hole 13 at the center of the top end of the upper fastening cap 1. The top surfaces of the first-layer valve body 3, the second-layer valve body 4, the third-layer valve body 5, the fourth-layer valve body 6 and the fifth-layer valve body 7, as well as the top surface of the nozzle valve body 8 and the middle annular surface 81 are respectively embedded with a sealing ring 100, so that high-pressure fuel is prevented from leaking out of the utility model. The upper end of the electromagnetic valve assembly 9 is embedded in the lower end of the second-layer valve body 4, and the lower end of the electromagnetic valve assembly 9 vertically and downwards passes through the first vertical holes 51 of the third-layer valve body 5, the fourth-layer valve body 6 and the fifth-layer valve body 7 in sequence and then is supported on the top surface of the nozzle valve body 8. The needle valve 10 vertically passes through the center of the fifth-layer valve body 7 and the second vertical hole 71 in the center of the nozzle valve body 8 in sequence and then is supported in the lower end of the nozzle valve body 8, and the lower end of the first vertical hole 51 is connected with the upper end of the second vertical hole 71 through the control oil path 20, so that the upper end of the needle valve 10 is connected with the lower end of the electromagnetic valve assembly 9.
The upper end of the needle valve 10 is sleeved with a needle valve return spring 101, the lower end of the needle valve 10 passes through the lower cavity 82 of the nozzle valve body, and the end head of the lower end of the needle valve 10 is abutted against the inner conical surface 821 of the lower cavity 82 of the nozzle valve body. The upper end of the high-pressure oil channel 41 with the oil pressure of 16-32 Mpa is connected with the bottom of the pressure accumulation cavity 11, and the lower end of the high-pressure oil channel 41 sequentially passes through the second-layer valve body 4, the third-layer valve body 5, the fourth-layer valve body 6, the fifth-layer valve body 7 and the lower cavity 82 of the nozzle valve body downwards to be connected. The control oil passage connects the high-pressure oil passage 41, the solenoid valve assembly 9, and the upper end of the needle valve 10.
As shown in fig. 2, the electromagnetic valve assembly 9 comprises an annular electromagnet 91, an armature 92, an upper valve rod 93, a middle valve core 94, an upper valve rod return spring 95 and a middle valve core return spring 96, wherein the electromagnet 91 is embedded into a counter bore 42 at the lower end of the second-layer valve body, the armature 92 is embedded into a counter bore 52 at the upper end of the third-layer valve body, the upper valve rod 93 is fixed on the top end of the upper valve rod 93, and the electromagnet 91 and the upper valve rod 93 are adjacent to each other. The upper valve rod return spring 95 is located in the electromagnet central hole 911, and two ends of the upper valve rod return spring 95 respectively abut against the counter bore 42 at the lower end of the second-layer valve body and the top end of the armature 92. The middle valve core 94 is sleeved on the middle part of the upper valve rod 93 and is embedded in the counter bore 52 at the lower end of the third layer valve body, the middle valve core return spring 96 is sleeved on the upper end of the middle valve core 94, the bottom end of the upper valve rod 93 sequentially passes through the fourth layer valve body 6 and the fifth layer valve body 7, and the upper valve rod is supported on the top surface of the nozzle valve body 8. The middle part of the high-pressure oil channel 41, the lower end of the upper valve rod 93 and the upper end of the needle valve 10 are connected through the control oil channel 20.
The control oil path 20 comprises a high-pressure cavity oil inlet orifice 201, a control cavity oil inlet orifice 202, an upper oil return orifice 203, a lower oil return orifice 204, an upper valve rod lower annular groove 931 and an upper valve rod bottom annular groove 932, wherein the upper end of the obliquely arranged high-pressure cavity oil inlet orifice 201 is connected with a high-pressure oil duct 41 passing through the bottom of the third-layer valve body, the lower end of the high-pressure cavity oil inlet orifice 201 is communicated with the right side of the upper valve rod lower annular groove 931, the left side of the upper valve rod lower annular groove 931 is communicated with the control cavity 72 on the upper side of the top end of the needle valve 10 through the control cavity oil inlet orifice 202 obliquely arranged on the fourth-layer valve body 6, and the control cavity 72 is positioned at the upper end of the second vertical hole 71 in the center of the fifth-layer valve body 7. The upper oil return throttle hole 203 and the lower oil return throttle hole 204 which are arranged at intervals up and down transversely penetrate through the left side of the control cavity 72 and the first vertical hole 51, a first horizontal oil return hole 205 on the right side of the first vertical hole 51 shown in fig. 3 is vertically intersected with one end of a second horizontal oil return hole 206, and the other end of the second horizontal oil return hole 206 is led to the fuel tank through an oil return port joint 207 and an oil return pipe 208. The first horizontal oil return hole 205 has the same diameter as the second horizontal oil return hole 206.
The distance a between the upper bus bar of the upper oil return throttle hole 203 and the lower bus bar of the lower oil return throttle hole 204 is smaller than the width B of the bottom ring groove of the upper valve rod, the upper edge of the bottom ring groove 932 of the upper valve rod is lower than the distance c=0.5-1.0 mm between the lower bus bar of the lower oil return throttle hole 204, and the structure can realize that the oil return of the upper oil return throttle hole 203 and the lower oil return throttle hole 204 simultaneously passes through the bottom ring groove 932 of the upper valve rod and then is discharged into a fuel tank through the first horizontal oil return hole 205 and the second horizontal oil return hole 206. The first horizontal oil return hole 205 and the second horizontal oil return hole 206 do not generate back pressure, which is more beneficial to injecting fuel after the needle valve 10 is opened.
The utility model comprises the following different stages:
a stage of oil injection preparation
The electromagnet 91 is powered off, the lower end head of the needle valve 10 abuts against the inner conical surface 821 of the lower cavity of the nozzle valve body under the action of the reset force of the needle valve reset spring 101, and the nozzle valve body 8 is closed. The middle valve core 94 sits on the top surface of the fourth-layer valve body 6 under the restoring force of the middle valve core restoring spring 96, and the middle valve core 94 is closed. The high-pressure fuel enters the pressure accumulation cavity 31 of the first-layer valve body 3 through the high-pressure fuel input joint 12 and the high-pressure fuel hole 13 in the center of the top end of the upper fastening cap 1, then sequentially passes through the high-pressure fuel channel 41, the high-pressure cavity fuel inlet throttle hole 201, the upper valve rod lower ring groove 931 and the control cavity fuel inlet throttle hole 202 to enter the control cavity 72 at the upper end of the needle valve 10, pushes the lower end of the needle valve 10 to overcome the elastic force of the needle valve return spring 101 and pass through the lower cavity 82 of the nozzle valve body, so that the end head of the lower end of the needle valve 10 is abutted against the conical surface 821 of the lower cavity of the nozzle valve body, and the needle valve 10 is in a closed state.
B spraying fuel oil slowly and then urgently
When the electromagnet 91 is connected with 4-8A of current, the electromagnetic force born by the armature 92 is larger than the pretightening force of the upper valve rod reset spring 95, the upper valve rod 93 moves upwards until the upper valve rod middle step 931 moves upwards to be abutted against the middle valve core step hole 941, and the lower annular groove of the upper valve rod is communicated with the lower oil return throttle hole 204 of 932. The fuel in the control chamber 72 at the upper side of the top end of the needle valve 10 returns to the fuel tank through the lower return orifice 204, the first horizontal return hole 205, the second horizontal return hole 206, the return port joint 207 and the return pipe 208 in this order, and the fuel pressure in the control chamber 72 gradually decreases. Meanwhile, after the upper valve rod lower annular groove 932 moves upwards, the communication between the high-pressure cavity oil inlet orifice 201 and the control cavity oil inlet orifice 202 is cut off, high-pressure fuel output by the high-pressure oil duct 41 cannot enter the control cavity 72, the internal combustion oil pressure of the control cavity 72 is gradually reduced until the fuel pressure received by the needle valve lower step surface 102 is greater than the sum of the fuel pressure at the upper end of the needle valve 10 and the needle valve return spring pretightening force 101, the needle valve 10 moves upwards, and the high-pressure fuel in the nozzle valve body lower cavity 82 enters the pressure cavity 103 at the bottom of the needle valve 10 through a gap between the needle valve 10 and the nozzle valve body lower cavity inner conical surface 821, and is sprayed out from the plurality of spray holes 104.
C quick injection fuel
When the electromagnet 91 is connected with 8-18A, the electromagnetic force born by the armature 92 is larger than the sum of the pretightening force of the upper valve rod return spring 95 and the pretightening force of the middle valve core return spring 96, the upper valve rod 93 moves upwards until the middle valve rod step 931 pushes the middle valve core 94 to be abutted against the top surface of the lower end counter bore 52 of the third layer valve body, the upper valve rod bottom annular groove 932 is simultaneously communicated with the upper oil return orifice 203 and the lower oil return orifice 204, the upper valve rod 93 and the middle valve core 94 stop moving upwards, and after the oil in the control cavity 72 passes through the upper oil return orifice 203 and the lower oil return orifice 204, the oil returns to the fuel tank through the upper valve rod bottom annular groove 932, the first horizontal oil return hole 203, the second horizontal oil return hole 204, the oil return port joint 207 and the oil return pipe 208. Meanwhile, after the annular groove 932 at the bottom of the upper valve rod moves upwards, the communication between the oil inlet orifice 201 of the high-pressure cavity and the oil inlet orifice 202 of the control cavity is cut off, high-pressure fuel output by the high-pressure oil duct 41 cannot enter the control cavity 72, the internal combustion oil pressure of the control cavity 72 is rapidly reduced until the fuel pressure received by the step surface at the lower part of the needle valve is greater than the sum of the fuel pressure at the upper end of the needle valve 10 and the pre-tightening force 101 of the needle valve return spring, and the needle valve 10 moves upwards rapidly. Because the gap between the needle valve 10 and the conical surface 821 of the lower cavity of the nozzle valve body 82 in the working condition is far larger than the corresponding gap between the needle valve 10 and the conical surface 821 of the lower cavity of the nozzle valve body in the working condition, the high-pressure fuel in the lower cavity 82 of the nozzle valve body enters the pressure cavity 103 at the bottom of the needle valve 10 through the gap between the needle valve 10 and the conical surface 821 of the lower cavity of the nozzle valve body, and then is rapidly ejected from the plurality of spray holes 104.
After the fuel injection mode is finished, the electromagnet 91 is powered off, and the fuel injection preparation stage of the working condition A is returned.
In addition to the above embodiments, other embodiments of the present utility model are possible, and all technical solutions formed by equivalent substitution or equivalent transformation are within the scope of the present utility model.
Claims (4)
1. The electric control fuel injector comprises an upper fastening cap, a lower shell, a first layer valve body, a second layer valve body, a third layer valve body, a fourth layer valve body, a fifth layer valve body, a nozzle valve body, a solenoid valve assembly, a needle valve and a control oil way, wherein the upper end and the lower end of the first layer valve body are respectively in threaded connection with the lower end of the upper fastening cap and the upper end of the lower shell, the top surface of the first layer valve body is abutted against the bottom surface of a threaded hole of the upper fastening cap, the bottom surface of the first layer valve body is abutted against the top surface of the second layer valve body, the third layer valve body, the fourth layer valve body, the fifth layer valve body and the nozzle valve body are sequentially embedded into the lower shell from top to bottom and are in clearance fit with the lower shell, and the lower end of the nozzle valve body penetrates out of the lower end of the lower shell; the first-layer valve body is a cylinder body provided with an accumulation cavity, and high-pressure fuel with the oil pressure of 16-32 Mpa enters the accumulation cavity of the first-layer valve body through a high-pressure fuel input joint and a high-pressure fuel hole in the center of the top end of the upper fastening cap; sealing rings are respectively embedded in the top surfaces of the first-layer valve body, the second-layer valve body, the third-layer valve body, the fourth-layer valve body and the fifth-layer valve body, the top surface of the nozzle valve body and the central ring surface; the upper end of the electromagnetic valve assembly is embedded in the lower end of the second-layer valve body, the lower end of the electromagnetic valve assembly vertically and downwards passes through the first vertical holes of the third-layer valve body, the fourth-layer valve body and the fifth-layer valve body in sequence and then is supported on the top surface of the nozzle valve body, and the needle valve vertically and downwards passes through the center of the fifth-layer valve body and the second vertical hole of the center of the nozzle valve body in sequence and then is supported in the lower end of the nozzle valve body; the lower end of the first vertical hole is connected with the upper end of the second vertical hole through a control oil way, so that the upper end of the needle valve is connected with the lower end of the electromagnetic valve assembly; the needle valve is characterized in that the needle valve upper end is sleeved with a needle valve reset spring, the needle valve lower end penetrates through the cavity at the lower part of the nozzle valve body, and the end head of the needle valve lower end is abutted against the inner conical surface of the cavity at the lower part of the nozzle valve body; the upper end of the high-pressure oil duct with pressure of 16-32 Mpa is connected with the bottom of the pressure accumulation cavity, and the lower end of the high-pressure oil duct sequentially passes through the second-layer valve body, the third-layer valve body, the fourth-layer valve body, the fifth-layer valve body and the lower cavity of the nozzle valve body downwards to be connected; the control oil way is also connected with the high-pressure oil way, the electromagnetic valve component and the upper end of the needle valve;
the electromagnetic valve assembly comprises an annular electromagnet, an armature, an upper valve rod, a middle valve core, an upper valve rod reset spring and a middle valve core reset spring, wherein the electromagnet is embedded into a counter bore at the lower end of the second-layer valve body, the armature is embedded into a counter bore at the upper end of the third-layer valve body, and the armature is fixed on the top end of the upper valve rod; the upper valve rod reset spring is positioned in the central hole of the electromagnet, and two ends of the upper valve rod reset spring respectively lean against the counter bore at the lower end of the second-layer valve body and the top end of the upper valve rod; the middle valve core is sleeved on the middle part of the upper valve rod and embedded in a counter bore at the lower end of the third layer valve body, the middle valve core reset spring is sleeved at the upper end of the middle valve core, the bottom end of the upper valve rod sequentially penetrates through the fourth layer valve body and the fifth layer valve body and is supported on the top surface of the nozzle valve body; the middle part of the high-pressure oil channel, the lower end of the upper valve rod and the upper end of the needle valve are connected through a control oil way.
2. The variable needle valve opening rate electronic control fuel injector of claim 1, wherein the control oil path comprises a high-pressure cavity oil inlet orifice, a control cavity oil inlet orifice, an upper oil return orifice, a lower oil return orifice, an upper valve rod lower ring groove and an upper valve rod bottom ring groove, the upper end of the obliquely arranged high-pressure cavity oil inlet orifice is connected with a high-pressure oil channel penetrating through the bottom of the third layer valve body, the lower end of the high-pressure cavity oil inlet orifice is communicated with one side of the upper valve rod lower ring groove, the other side of the upper valve rod lower ring groove is communicated with a control cavity on the upper side of the needle valve top end through a control cavity oil inlet orifice obliquely arranged on the fourth layer valve body, and the control cavity is positioned at the upper end of a second vertical hole in the center of the fifth layer valve body; the upper oil return throttle hole and the lower oil return throttle hole which are arranged at intervals up and down transversely penetrate through the control cavity and one side of the first vertical hole, a first horizontal oil return hole at the other side of the first vertical hole is vertically intersected with one end of a second horizontal oil return hole, and the other end of the second horizontal oil return hole is communicated with the fuel tank through an oil return port joint and an oil return pipe; the diameters of the first horizontal oil return holes and the second horizontal oil return holes are the same.
3. The variable needle valve opening rate electronic control injector as claimed in claim 2, wherein the distance a between the upper side busbar of the upper oil return orifice and the lower side busbar of the lower oil return orifice is smaller than the width B of the bottom ring groove of the upper valve stem, and the upper edge of the bottom ring groove of the upper valve stem is lower than the distance c=0.5-1.0 mm between the lower side busbar of the lower oil return orifice.
4. The variable needle valve opening rate electronic control fuel injector of claim 1, wherein the nozzle valve body is a stepped shaft body, a hemispherical nozzle with a pressure cavity therein extends downwards from the bottom end of the stepped shaft body, and a plurality of fuel injection holes are uniformly distributed in the hemispherical nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321237675.9U CN220415563U (en) | 2023-05-22 | 2023-05-22 | Electric control fuel injector with variable needle valve opening speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321237675.9U CN220415563U (en) | 2023-05-22 | 2023-05-22 | Electric control fuel injector with variable needle valve opening speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220415563U true CN220415563U (en) | 2024-01-30 |
Family
ID=89660031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321237675.9U Active CN220415563U (en) | 2023-05-22 | 2023-05-22 | Electric control fuel injector with variable needle valve opening speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220415563U (en) |
-
2023
- 2023-05-22 CN CN202321237675.9U patent/CN220415563U/en active Active
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