Double-electromagnetic type control ejector

Abstract

The invention discloses a double electromagnetic type control ejector which comprises a nozzle body assembly, a needle valve assembly, an iron core, a reset spring and a nozzle head, the iron core, the reset spring and the needle valve assembly are installed in the nozzle body assembly, the reset spring is located between the iron core and the needle valve assembly, the nozzle head is installed on the nozzle body assembly, and the needle valve assembly is installed on the nozzle head. The nozzle is characterized in that two electromagnetic valve coils are arranged in the axial direction of the nozzle body assembly, and the two electromagnetic valve coils are connected in parallel; and two armatures are arranged in the needle valve part. By means of the double armatures and the double electromagnetic coils, electromagnetic force for axial movement of the needle valve component is increased, normal work of the injector under the oil pressure of 350-600 bar can be achieved, meanwhile, when the oil pressure is lower than 350 bar, the needle valve component is easier to axially pull and conduct normal oil injection work due to reduction of the oil pressure, and therefore the double-armature double-electromagnetic-coil injector can be suitable for work under different oil pressures of 5-600 bar.

Description

Technical Field

[0001] The invention belongs to the field of automobile manufacturing, in particular to a dual electromagnetic control injector. Background Art

[0002] Existing electromagnetic injectors usually have only one electromagnetic valve assembly and a movable moving assembly. When the coil in the electromagnetic valve assembly is energized, the electromagnetic valve generates an electromagnetic force to act on the armature. The electromagnetic force overcomes the spring force and drives the armature assembly to move axially between the open position and the closed position, thereby realizing the opening and closing of the electromagnetic injection valve. At present, the common electromagnetic injection valves on the market have a maximum injection pressure of 350 bar due to the design of a single electromagnetic coil and the influence of electromagnetic force. However, as emission regulations become more and more stringent, higher requirements are placed on the content of unburned hydrocarbons and nitrogen oxides in automobile exhaust, as well as for better injection atomization effect and thus improved fuel economy. If the injector used in the engine can inject fuel at a pressure of more than 350 bar or even more than 600 bar, the atomized particles generated by the injection will be smaller, so that the fuel and air in the engine are mixed more evenly, and the injected fuel can be completely burned, ultimately reducing the generation of emission pollutants and bringing better fuel economy.

[0003] In order to achieve a higher injection pressure, CN102472214A discloses a fluid injector and a method for operating the fluid injector, wherein the fluid injector has only one solenoid valve, including at least a first coil and a second coil, and the operation is to magnetically drive the iron core via at least one electrical signal applied to the two coils. When the two electrical signals of the two coils are operated, the inductance generated by the two coils in series can be formed, thereby generating a larger electromagnetic force, and finally achieving a higher injection pressure. However, due to the magnetic properties of the electromagnetic material, as the electrical signal increases, the inductance increases. When the electromagnetic material reaches the saturation magnetic induction intensity, the inductance also reaches the maximum value and cannot increase any further. At this time, the electromagnetic force also increases to the limit value, so the injection pressure can only reach a maximum pressure upper limit value such as 200 bar. If you want to rely on a single solenoid valve to increase the injection pressure, the effect will not be obvious.

[0004] CN1776214B discloses a fuel injector with plunger electromagnetic excitation, which has two electromagnets, that is, the outer surface of the tubular housing of the injector has two annular grooves, wherein each annular groove is wound with a corresponding coil of the electromagnet. The two electromagnets work together to achieve a higher injection pressure of the injector by generating a superimposed electromagnetic force. The solenoid valve of the injector adopts a self-bonding coil without a skeleton, which uses an insulating coil wire covered with an insulating coating, and a fusion bonding layer with self-fusion properties is coated on the insulating coating. When the temperature of the coil rises, the fusion bonding layer is melted by the influence of the temperature, so that the layers of coils wound in the annular groove are bonded together, and when the temperature is reduced, the entire coil is condensed into a certain shape. However, the disadvantage of this technical solution is that the process of the self-bonding coil without a skeleton is complicated and difficult to position, and its fusion bonding layer is greatly affected by temperature. High temperature will affect the insulation of the coil and thus have an adverse effect on the reliable operation of the solenoid valve. In addition, the structure cannot provide injection pressures in different ranges according to the needs of the engine. When the engine is in a low-load zone, only a low-injection-pressure spray is needed to achieve good combustion in the cylinder. Excessive injection pressure will increase the R&D cost of the entire engine. When the engine is in a high-load zone, a spray with too low an injection pressure will cause abnormal combustion in the cylinder, and the purpose of saving fuel cannot be achieved.

[0005] CN104763568A discloses an electromagnetic injection valve, including a porous nozzle, a tubular housing, a needle valve body, a moving component and an electromagnetic valve assembly for controlling the axial movement of the moving component between an open position and a closed position; the electromagnetic valve assembly includes at least two groups of electromagnetic valves, characterized in that the coils of the at least two groups of electromagnetic valves are electrically connected in parallel, and can be powered on individually or in combination. The present invention can achieve the injection performance of the electromagnetic injection valve to inject fuels of injection pressures in different intervals, such as injection pressures in three intervals of 0.3-15MPa, 15-30MPa and 30-45MPa, and can also achieve injection performance of high injection pressure; at the same time, the above-mentioned tubular housing has a first iron core and a second iron core arranged in an integral manner, and the above-mentioned coil assembly is constructed into an integral structure, and the tubular housing and the integral coil assembly constitute two electromagnetic valves that generate different electromagnetic forces, which have a compact structure, simple assembly, and easy processing and realization. However, the injection pressure of the patent can only reach 45MPa at most, which is still relatively low. Summary of the invention

[0006] The purpose of the present invention is to develop a dual electromagnetic control injector to address the problem that the above-mentioned existing similar products cannot achieve high-pressure injection. An electromagnetic coil is added in the axial direction of the injector and is connected in parallel with the original coil. An armature is added to the needle valve component, so that when the needle valve component in the injector is working, there are two armatures that are subjected to the electromagnetic force generated by the coil, thereby solving the problem that the injector cannot be opened under high pressure due to insufficient electromagnetic force. Through the improved structure, the electromagnetic valve in the injector can work normally under high pressure conditions of 350bar-700bar. Under the same injection medium, a higher injection pressure can provide a better atomization effect, and then provide better fuel economy and excellent emission effects.

[0007] In order to achieve the above-mentioned purpose of the invention, the dual electromagnetic control injector of the present invention includes a nozzle body assembly, a needle valve assembly, an iron core, a return spring and a nozzle head, the iron core, the return spring and the needle valve assembly are installed in the nozzle body assembly, the return spring is located between the iron core and the needle valve assembly, and the nozzle head is installed on the nozzle body assembly, and is characterized in that two solenoid valve coils are arranged in the axial direction of the nozzle body assembly, and the two solenoid valve coils are connected in parallel; two armatures are arranged in the needle valve component.

[0008] In a preferred embodiment of the present invention, a first limiting sleeve is provided in the nozzle body assembly, and the first limiting sleeve is located between two armatures in the needle valve component.

[0009] In a preferred embodiment of the present invention, the nozzle body assembly includes an iron core sleeve, a first magnetic isolation sleeve, a nozzle connecting sleeve, a second magnetic isolation sleeve and a nozzle body which are coaxially arranged from top to bottom, a circle groove is arranged on the outer periphery of the first magnetic isolation sleeve and the outer periphery of the second magnetic isolation sleeve, and two solenoid valve coils are respectively placed in the two circle grooves; the outer circle of the nozzle body is composed of four-stage rod segments, which are the first rod segment, the second rod segment, the third rod segment and the fourth rod segment which are coaxially arranged from top to bottom; the first step surface and the second step surface are respectively arranged above and below the second rod segment, wherein the second step surface is an inclined surface; the first circle groove and the second circle groove are arranged in the middle position of the fourth rod segment; the iron core sleeve The core and the return spring are arranged in the inner hole of the iron core sleeve; the two armatures in the needle valve component are located in the inner hole of the first magnetic isolation sleeve, the inner hole of the nozzle connecting sleeve, and the inner hole of the second magnetic isolation sleeve; the inner hole of the nozzle body is divided into three sections, which are the first hole section, the second hole section and the third hole section from top to bottom, the first hole section and the second hole section are connected by a first chamfer in the middle, and the second hole section and the first chamfer are connected at the connection with the first chamfer. A first fillet transition is adopted; a second chamfer is arranged at the bottom of the lower end of the second hole section, a second fillet is arranged at the upper end and the end face of the third hole section, and a third chamfer is arranged at the bottom of the third hole section; the nozzle head is fixed in the third hole section.

[0010] In a preferred embodiment of the present invention, the needle valve component further includes: a valve stem, a steel ball, a first positioning sleeve, a second positioning sleeve, a second limiting sleeve, a third limiting sleeve, and a buffer spring; two armatures are arranged in the needle valve component, namely a first armature and a second armature, and the first armature and the second armature are fixed on the valve stem at intervals up and down; the second limiting sleeve and the third limiting sleeve are also fixed on the valve stem at intervals up and down and are located in the inner hole of the first magnetic isolation sleeve, the inner hole of the nozzle connecting sleeve, and the inner hole of the second magnetic isolation sleeve, wherein the second limiting sleeve is located below the first armature, and the third limiting sleeve is located below the second armature; the first positioning sleeve And the second positioning sleeve is sleeved on the valve stem, wherein the first positioning sleeve is located above the first armature and in the inner hole of the core sleeve and contacts with the bottom of the reset spring, and the second positioning sleeve is located above the second armature; the first limiting sleeve is located in the inner hole of the first magnetic isolation sleeve, the inner hole of the nozzle connecting sleeve and the inner hole of the second magnetic isolation sleeve and is bounded by the first armature and the second armature, and the second positioning sleeve is arranged in the inner hole of the first limiting sleeve; the buffer spring is arranged between the second positioning sleeve and the second armature; the middle and lower part of the valve stem is arranged in the second hole section of the inner hole of the nozzle body, and the steel ball is fixed at the bottom of the valve stem.

[0011] In a preferred embodiment of the present invention, a first axial gap is provided between the top surface of the first armature and the bottom surface of the core sleeve; the first axial gap is the opening stroke of the needle valve component.

[0012] In a preferred embodiment of the present invention, a second axial gap is provided between the bottom surface of the second armature and the top surface of the third limiting sleeve, and the second axial gap is a buffer stroke of the needle valve component, and the buffer stroke is greater than the opening stroke of the needle valve component.

[0013] In a preferred embodiment of the present invention, an end face ring groove sink is provided in the second armature, and a portion of the buffer spring is disposed in the end face ring groove sink.

[0014] In a preferred embodiment of the present invention, the lower ends of the outer circles of the first armature and the second armature are both provided with a single-sided 15° chamfer.

[0015] In a preferred embodiment of the present invention, a plurality of inclined holes are provided inside the first armature and the second armature, and the upper ends of the inclined holes are closer to the valve stem than the lower ends of the inclined holes.

[0016] In a preferred embodiment of the present invention, the first positioning sleeve is a hollow cylindrical structure with an inner hole, and a fourth chamfer is provided at the lower end of the inner hole of the first positioning sleeve; third fillets are provided at both upper and lower ends of the outer circle of the first positioning sleeve.

[0017] In a preferred embodiment of the present invention, the second limiting sleeve and the third limiting sleeve have the same structure, both having an outer circle and an inner hole, the inner holes of the second limiting sleeve and the third limiting sleeve are fixed on the valve stem, and the outer circle of the second limiting sleeve and the third limiting sleeve is composed of two-stage rod segments connected upper and lower, wherein the diameter of the first upper stage rod segment is greater than the diameter of the first lower stage rod segment.

[0018] In a preferred embodiment of the present invention, the second positioning sleeve also has an inner hole and an outer circle, the inner hole of the second positioning sleeve is fixed on the valve stem, and the outer circle of the second positioning sleeve is composed of two rod sections connected upper and lower, wherein the diameter of the second upper rod section is smaller than the diameter of the second lower rod section; the second lower rod section is matched with the inner hole of the first limiting sleeve, and the bottom surface of the second lower rod section is in contact with the top surface of the buffer spring.

[0019] In a preferred embodiment of the present invention, the steel ball is cut into a tripartite structure symmetrically along the center, and the surface of the steel ball is plated with diamond-like carbon after grinding and welding.

[0020] Due to the adoption of the above technical solution, the present invention uses double armatures and double electromagnetic coils to increase the electromagnetic force on the axial movement of the needle valve component, and can achieve normal operation of the injector under an oil pressure of 350-600 bar. At the same time, when the oil pressure is lower than 350 bar, the reduction in the oil pressure makes it easier for the needle valve component to be pulled axially to perform normal oil injection. Therefore, the present invention is applicable to working under different oil pressures of 5-600 bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the dual electromagnetic control injector of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the nozzle body assembly in the dual electromagnetic control injector of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of the needle valve component in the dual electromagnetic control injector of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the scope of the embodiments.

[0025] See also Figure 1The double electromagnetic control injector shown in the figure includes a nozzle body assembly 10, a needle valve assembly 20, an iron core 30, a return spring 40 and a nozzle head 50. The iron core 30, the return spring 40 and the needle valve assembly 20 are installed in the nozzle body assembly 10. The return spring 40 is located between the iron core 30 and the needle valve assembly 20. The nozzle head 50 is installed on the nozzle body assembly 10. A limit sleeve 60 (the aforementioned first limit sleeve) is provided in the nozzle body assembly 10. The limit sleeve 60 is located between the two armatures 21 and 22 (the aforementioned first armature and the second armature) in the needle valve component 20. Two electromagnetic valve coils 71 and 72 are provided in the axial direction of the nozzle body assembly 10, and the two electromagnetic valve coils 71 and 72 are connected in parallel through a coil wire 80.

[0026] The solenoid valve coils 71 and 72 are wound with enameled wire. Before winding, a layer of insulating film needs to be attached to the nozzle body assembly. When winding the solenoid valve coils 71 and 72, the wire diameter and the number of winding turns of the enameled wire are controlled, thereby controlling the resistance and inductance of the solenoid valve coils 71 and 72. After winding, they are connected to the coil wire 80 by soldering. The solenoid valve coils 71 and 72 are connected in parallel to the two coil wires 80 and finally sealed with plastic to achieve the effect of protecting the coil and insulating it.

[0027] A sealing cone 51 is provided in the nozzle head 50, and two-stage stepped holes are provided on the sealing cone 51, which are respectively a first hole section 51a and a second hole section 51b from top to bottom; six spray holes 62a and one identification hole 62b are provided on the nozzle plate 52 on the nozzle head 50. The spray holes 62a are through holes and are symmetrically distributed along the nozzle plate 52. The identification hole 62b is a blind hole and is located on the symmetrical center line of the spray holes 62a.

[0028] See also Figure 2 The nozzle body assembly 10 includes an iron core sleeve 11, a first magnetic isolation sleeve 12, a nozzle connection sleeve 13, a second magnetic isolation sleeve 14 and a nozzle body 15 which are coaxially arranged from top to bottom. A circle groove 16, 17 is arranged on the outer periphery of the magnetic isolation sleeves 12, 14, and two solenoid valve coils 71, 72 are respectively placed in the two circle grooves 16, 17. The first magnetic isolation sleeve 12 and the second magnetic isolation sleeve 14 are thin-walled austenitic stainless steel parts.

[0029] The outer circle of the nozzle body 15 is composed of four rod segments, which are the first rod segment 15a, the second rod segment 15b, the third rod segment 15c and the fourth rod segment 15d arranged coaxially from top to bottom; the first step surface 15ba and the second step surface 15bb are respectively arranged above and below the second rod segment 15b, wherein the second step surface 15bb is an inclined surface. The nozzle body 15 is assembled in the monomer pump through the second rod segment 15b, the third rod segment 15c and the fourth rod segment 15d and the first step surface 15ba and the second step surface 15bb.

[0030] A first annular groove 15da and a second annular groove 15db are provided at a middle position of the fourth rod segment 15d.

[0031] The iron core 30 and the return spring 40 are arranged in the inner hole 11a of the iron core sleeve 11; the two armatures 21 and 22 in the needle valve component 20 are located in the inner hole 12a of the first magnetic isolation sleeve 12, the inner hole 13a of the nozzle connecting sleeve 13, and the inner hole 14a of the second magnetic isolation sleeve 14.

[0032] The inner hole of the nozzle body 15 is divided into three sections, which are respectively the first hole section 15e, the second hole section 15f and the third hole section 15g from top to bottom. The first hole section 15e and the second hole section 15f are connected by a 45° first chamfer 15h in the middle, and the first fillet 15i is used for transition at the connection between the second hole section 15f and the first chamfer 15h; the second hole section 15e is provided with a second chamfer 15j at the bottom of the lower end, the third hole section 15g is provided with a second fillet 15m at the upper end and the end face 15k, and the third hole section 15f is provided with a third chamfer 15n at the bottom; the nozzle head 50 is fixed in the third hole section 15g by welding.

[0033] The nozzle connecting sleeve 13 is made of ferrite stainless steel, and the outer circle is composed of three rod segments, which are the first rod segment 13b, the second rod segment 13c, the third rod segment 13d and two step surfaces, which are coaxially arranged from top to bottom, and the first step surface 13e and the second step surface 13f, respectively. The second rod segment 13c is designed with an arc notch. The first rod segment 13b and the third rod segment 13d are used to install the first magnetic isolation sleeve 12 and the second magnetic isolation sleeve 14, respectively.

[0034] See also Figure 3 The needle valve component 20 also includes: a valve stem 23 , a steel ball 24 , a first positioning sleeve 25 , a second positioning sleeve 26 , a second limiting sleeve 27 , a third limiting sleeve 28 , and a buffer spring 29 .

[0035] The valve stem 23 is a slender rod made of high-carbon martensitic stainless steel. A groove 23a similar to a center hole is designed on the bottom surface to facilitate coaxial welding of the steel ball 24. A chamfer 23b is designed on the upper end of the valve stem 23.

[0036] The armatures 21 and 22 are made of soft magnetic stainless steel and have a basic hollow cylindrical structure. They are fixed at intervals on the upper part of the valve stem 23. The second limiting sleeve 26 and the third limiting sleeve 28 are also fixed at intervals on the upper part of the valve stem 23 and are located in the inner hole 12a of the first magnetic isolation sleeve 12, the inner hole 13a of the nozzle connecting sleeve 13 and the inner hole 14a of the second magnetic isolation sleeve 14, wherein the second limiting sleeve 26 is located below the armature 21 and the third limiting sleeve 28 is located below the armature 22.

[0037] The first positioning sleeve 25 and the second positioning sleeve 26 are sleeved on the upper part of the valve stem 23, wherein the first positioning sleeve 25 is located above the armature 21 and in the inner hole 11a of the core sleeve 11, the top of the first positioning sleeve 25 contacts the bottom of the return spring 50, and the second positioning sleeve 28 is located above the armature 22.

[0038] The first limiting sleeve 60 is located in the inner hole 12a of the first magnetic isolation sleeve 12, the inner hole 13a of the nozzle connecting sleeve 13 and the inner hole 14a of the second magnetic isolation sleeve 14, and the second positioning sleeve 26 is arranged in the inner hole 61 of the first limiting sleeve 60; the buffer spring 29 is arranged between the second positioning sleeve 26 and the armature 22; the middle and lower parts of the valve stem 23 are arranged in the second hole section 15b of the inner hole of the nozzle body 15, and the steel ball 24 is fixed at the bottom of the valve stem 23.

[0039] The steel ball 24 is cut symmetrically along the center into a tripartite structure. The surface of the steel ball is plated with diamond-like carbon after grinding and welding.

[0040] A first axial gap is provided between the top surface of the armature 21 and the bottom surface of the core sleeve 11; the first axial gap is the opening stroke of the needle valve component 20. A second axial gap is provided between the bottom surface of the armature 22 and the top surface of the third limiting sleeve 28; the second axial gap is the buffer stroke of the needle valve component 20, and the buffer stroke is greater than the opening stroke of the needle valve component.

[0041] An end face ring groove sink 22a is provided in the armature 22, and a part of the buffer spring 29 is arranged in the end face ring groove sink 22a. The lower ends of the outer circles of the armatures 21 and 22 are both provided with single-sided 15° chamfers 21a and 22b for easy assembly.

[0042] A plurality of inclined holes 21b, 22c (for example, 6, but not limited to 6, and other numbers) are provided inside the armatures 21, 22, and the upper ends of the inclined holes 21b, 22c are closer to the valve stem than the lower ends of the inclined holes 21b, 22c. The inclined holes 21b, 22c are outwardly expanded, so that the design of the inclined holes 21b, 22c is conducive to the oil flow of the injector; the needle valve component 20 is driven to move axially upward by the magnetic field force of the electromagnetic coil in the injector structure.

[0043] The first positioning sleeve 25 is a thin-walled part of austenitic stainless steel and has a hollow cylindrical structure, with an inner hole 25a. The lower end of the inner hole 25a of the first positioning sleeve 25 is provided with a fourth chamfer 25b with a single side of 10° for easy assembly; the upper and lower ends of the outer circle of the first positioning sleeve 25 are provided with third fillets 25c and 25d. It mainly plays the role of fixing the armature 21 in the injector.

[0044] The second limiting sleeve 27 and the third limiting sleeve 28 are thin-walled parts of austenitic stainless steel, and both have the same structure, and both have an outer circle and an inner hole 27a, 28a. The inner holes 27a, 28a of the second limiting sleeve 27 and the third limiting sleeve 28 are fixed on the upper part of the valve stem 23. The outer circle of the second limiting sleeve 27 and the third limiting sleeve 28 is composed of two-stage rod segments 27b, 27c, 28b, 28c connected up and down, wherein the diameter of the first upper rod segment 27b, 28b is greater than the diameter of the first lower rod segment 27c, 28c. The first upper rod segment 27b, 28b is used to support the armature 21, 22, and the first lower rod segment 27c, 28c has a thin wall thickness and a longer length, which is convenient for welding to the valve stem 6 during assembly.

[0045] The second positioning sleeve 26 is an austenitic stainless steel thin-walled part, and also has an inner hole 26a and an outer circle. The inner hole 26a of the second positioning sleeve 26 is fixed on the upper part of the valve stem 23, and the lower end of the inner hole 26a is designed with a single-sided 10° chamfer to facilitate the assembly process; the outer circle of the second positioning sleeve 26 is composed of two-stage rod segments connected upper and lower, wherein the diameter of the second upper rod segment 26b is smaller than the diameter of the second lower rod segment 26c; the second lower rod segment 26c is assembled with the inner hole 61 of the first limiting sleeve 60, and the bottom surface of the second lower rod segment 26c is in contact with the top surface of the buffer spring 29.

[0046] The buffer spring 29 is made of austenitic stainless steel. The upper and lower end surfaces of the buffer spring 29 are ground flat and must be perpendicular to the central axis of the buffer spring 29. The buffer spring 29 must meet the specified fatigue test verification.

[0047] The upper part of the injector of the present invention is connected to the oil inlet of the core sleeve 11, and the fuel will spread throughout the injector through the inner hole 11a of the core sleeve 11, the inclined holes 21b, 22c of the armature 21, 22, the gap between the valve stem 23 in the needle valve component 20 and the second hole section 15b of the inner hole of the nozzle body 15. At this time, the steel ball 24 of the needle valve component 20 of the injector and the nozzle head 50 are sealed under the pressure of the return spring 50, and the two parallel electromagnetic coils 71, 72 are powered by the coil wire 80. The electromagnetic coils 71, 72 will generate electromagnetic force to act on the armature 21, 22 of the needle valve component 20, thereby pulling the needle valve component 20 to move axially upward, and the injector opens to spray fuel.

[0048] After the electromagnetic coils 71 and 72 are powered off, the injector is closed under the combined action of the spring force of the return spring 50, the buffer spring 29 in the needle valve component 20 and the fuel oil pressure; the injector generates intermittent electromagnetic force to complete the reciprocating axial movement of the needle valve component 20 to realize the injection process when the electromagnetic coils 71 and 72 are continuously powered on and off; the injector is designed with a double armature 21, 22 and a double electromagnetic coil 71, 72 to increase the electromagnetic force for the axial movement of the needle valve component 20, so that the normal operation of the injector can be achieved under an oil pressure of 350-600 bar. At the same time, when the double electromagnetic control injector structure is lower than 350 bar, the needle valve component 20 of the injector is more easily pulled axially due to the reduction of the oil pressure, so that normal injection operation can be performed; therefore, the double electromagnetic control injector structure of the present invention can be applied to work under different oil pressures of 5-600 bar.

Claims

1. A dual electromagnetic control injector, comprising a nozzle body assembly, a needle valve assembly, an iron core, a return spring and a nozzle head, wherein the iron core, the return spring and the needle valve assembly are installed in the nozzle body assembly, the return spring is located between the iron core and the needle valve assembly, and the nozzle head is installed on the nozzle body assembly, characterized in that: Two solenoid valve coils are arranged in the axial direction of the nozzle body assembly and are connected in parallel; and two armatures are arranged in the needle valve component.

2. A dual electromagnetic control injector according to claim 1, characterized in that: A first limiting sleeve is arranged in the nozzle body assembly, and the first limiting sleeve is located between two armatures in the needle valve component.

3. A dual electromagnetic control injector according to claim 1 or 2, characterized in that: The nozzle body assembly comprises an iron core sleeve, a first magnetic isolation sleeve, a nozzle connecting sleeve, a second magnetic isolation sleeve and a nozzle body which are coaxially arranged from top to bottom. A circle groove is arranged on the outer periphery of the first magnetic isolation sleeve and the outer periphery of the second magnetic isolation sleeve, and two solenoid valve coils are respectively placed in the two circle grooves; the outer circle of the nozzle body is composed of four-stage rod segments, which are the first rod segment, the second rod segment, the third rod segment and the fourth rod segment which are coaxially arranged from top to bottom; the first step surface and the second step surface are respectively arranged above and below the second rod segment, wherein the second step surface is an inclined surface; the first circle groove and the second circle groove are arranged in the middle position of the fourth rod segment; the iron core and the reset spring The spring is arranged in the inner hole of the core sleeve; the two armatures in the needle valve component are located in the inner hole of the first magnetic isolation sleeve, the inner hole of the nozzle connecting sleeve, and the inner hole of the second magnetic isolation sleeve; the inner hole of the nozzle body is divided into three sections, which are the first hole section, the second hole section and the third hole section from top to bottom, the first hole section and the second hole section are connected by the first chamfer in the middle, and the first fillet transition is adopted at the connection between the second hole section and the first chamfer; the second hole section is provided with a second chamfer at the bottom of the lower end, the third hole section is provided with a second fillet at the upper end and the end face, and the third hole section is provided with a third chamfer at the bottom; the nozzle head is fixed in the third hole section.

4. A dual electromagnetic control injector according to claim 3, characterized in that: The needle valve component also includes: a valve stem, a steel ball, a first positioning sleeve, a second positioning sleeve, a second limiting sleeve, a third limiting sleeve, and a buffer spring; two armatures are arranged in the needle valve component, namely a first armature and a second armature, and the first armature and the second armature are fixed on the valve stem at intervals up and down; the second limiting sleeve and the third limiting sleeve are also fixed on the valve stem at intervals up and down and are located in the inner hole of the first magnetic isolation sleeve, the inner hole of the nozzle connecting sleeve, and the inner hole of the second magnetic isolation sleeve, wherein the second limiting sleeve is located below the first armature, and the third limiting sleeve is located below the second armature; the first positioning sleeve and the second positioning sleeve are fixed on the valve stem at intervals up and down and are located in the inner hole of the first magnetic isolation sleeve, the inner hole of the nozzle connecting sleeve, and the inner hole of the second magnetic isolation sleeve, wherein the second limiting sleeve is located below the first armature, and the third limiting sleeve is located below the second armature; On the valve stem, the first positioning sleeve is located above the first armature and in the inner hole of the core sleeve and contacts with the bottom of the reset spring, and the second positioning sleeve is located above the second armature; the first limiting sleeve is located in the inner hole of the first magnetic isolation sleeve, the inner hole of the nozzle connecting sleeve and the inner hole of the second magnetic isolation sleeve and is bounded by the first armature and the second armature, and the second positioning sleeve is arranged in the inner hole of the first limiting sleeve; the buffer spring is arranged between the second positioning sleeve and the second armature; the middle and lower part of the valve stem is arranged in the second hole section of the inner hole of the nozzle body, and the steel ball is fixed at the bottom of the valve stem.

5. A dual electromagnetic control injector according to claim 4, characterized in that: A first axial gap is provided between the top surface of the first armature and the bottom surface of the core sleeve; the first axial gap is the opening stroke of the needle valve component.

6. A dual electromagnetic control injector according to claim 5, characterized in that: A second axial gap is provided between the bottom surface of the second armature and the top surface of the third limiting sleeve, and the second axial gap is a buffer stroke of the needle valve component, and the buffer stroke is greater than the opening stroke of the needle valve component.

7. A dual electromagnetic control injector according to claim 6, characterized in that: An end face ring groove sink is provided in the second armature, and a part of the buffer spring is arranged in the end face ring groove sink.

8. A dual electromagnetic control injector according to claim 7, characterized in that: The lower ends of the outer circles of the first armature and the second armature are both provided with a single-sided 15° chamfer.

9. A dual electromagnetic control injector according to claim 8, characterized in that: A plurality of inclined holes are disposed inside the first armature and the second armature, and the upper ends of the inclined holes are closer to the valve stem than the lower ends of the inclined holes.

10. A dual electromagnetic control injector according to claim 9, characterized in that: The first positioning sleeve is a hollow cylindrical structure with an inner hole. The lower end of the inner hole of the first positioning sleeve is provided with a fourth chamfer; and the upper and lower ends of the outer circle of the first positioning sleeve are provided with third fillets.

11. A dual electromagnetic control injector according to claim 10, characterized in that: The second limiting sleeve and the third limiting sleeve have the same structure, both having an outer circle and an inner hole, the inner holes of the second limiting sleeve and the third limiting sleeve are fixed on the valve stem, and the outer circle of the second limiting sleeve and the third limiting sleeve is composed of two-stage rod segments connected up and down, wherein the diameter of the first upper rod segment is greater than the diameter of the first lower rod segment.

12. A dual electromagnetic control injector according to claim 11, characterized in that: The second positioning sleeve also has an inner hole and an outer circle, the inner hole of the second positioning sleeve is fixed on the valve stem, the outer circle of the second positioning sleeve is composed of two rod sections connected upper and lower, wherein the diameter of the second upper rod section is smaller than the diameter of the second lower rod section; the second lower rod section is matched with the inner hole of the first limiting sleeve, and the bottom surface of the second lower rod section is in contact with the top surface of the buffer spring.

13. A dual electromagnetic control injector according to claim 12, characterized in that: The steel ball is cut into a tripartite structure symmetrically along the center, and the surface of the steel ball is plated after grinding and welding, and the surface is plated with diamond-like carbon.

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