Needle valve inside and outside double-open type high-pressure methanol dual-fuel injector based on electromagnetic-permanent magnet coupling

Abstract

The invention aims to provide a needle valve inside and outside double-open type high-pressure methanol dual-fuel injector based on electromagnetic-permanent magnet coupling, and belongs to the field of engines, the needle valve inside and outside double-open type high-pressure methanol dual-fuel injector comprises a methanol joint, an injector main body, an injector intermediate block and a nozzle body, the methanol joint is mounted at the top of the injector main body, and the injector main body is connected with the nozzle body through the injector intermediate block; an oppositely-arranged three-position high-speed electromagnetic valve assembly is installed in the ejector body, a one-way fuel oil guiding connector is installed on the side portion of the ejector body, and an inside-outside double-opening type nozzle assembly is installed in the nozzle body. Integrated independent injection of methanol and ignition oil is achieved through the internal and external double-opening type nozzle assembly and the opposed three-position high-speed electromagnetic valve assembly, methanol fuel is controlled by an internal-opening type needle valve to be subjected to large-flow injection, the ignition oil is controlled by an external-opening type sleeve needle valve to be subjected to trace injection, the cold start characteristic of a methanol engine is effectively improved, and the cold start efficiency of the methanol engine is improved. And a permanent magnet synergistic excitation technology is coupled, so that the dynamic response characteristics of two kinds of fuel injection are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an engine, in particular a fuel injector. BACKGROUND

[0002] Methanol is the simplest saturated monohydric carbon alcohol compound, which can be prepared by biological, chemical, carbon capture and other technologies. When the engine uses green methanol as fuel, it can reduce more than 90% of carbon emissions, 60% of nitrogen oxides and 99% of sulfur oxides compared with burning diesel. At the same time, China's methanol production and sales related industry chain is very mature. Based on the current basic energy structure in China, methanol is considered to be one of the most promising low-carbon clean alternative fuels.

[0003] However, due to the low heat value and low cetane number of methanol fuel, the large latent heat of vaporization, the difficulty of liquid methanol evaporation and the poor ability of spontaneous ignition, when the methanol content in the fuel exceeds 85%, the engine will generally have the phenomenon of cold start difficulty. The use of high-activity pilot oil spray ignition technology, such as diesel and dimethyl ether, can significantly improve the unstable problem of methanol spray ignition in the cylinder, effectively solve the problem of engine cold start difficulty, and in addition, due to the limited space of the engine cylinder cover, it is difficult to widely use the independent double-injector arrangement. SUMMARY

[0004] The purpose of the present application is to provide a needle valve internal and external double-opening high-pressure methanol dual-fuel injector based on electromagnetic-permanent magnet coupling, which realizes the integration of methanol and pilot oil fuel injection by coupling electromagnetic-permanent magnet cooperative excitation technology.

[0005] The purpose of the present application is achieved as follows: The needle valve internal and external double-opening high-pressure methanol dual-fuel injector based on electromagnetic-permanent magnet coupling, characterized in that: it comprises a methanol joint, an injector main body, an injector intermediate block and a nozzle body, the methanol joint is installed at the top of the injector main body, the injector main body and the nozzle body are connected through the injector intermediate block, a three-position high-speed electromagnetic valve assembly is installed in the injector main body, a one-way pilot oil joint is installed on the side of the injector main body, and an internal and external double-opening nozzle assembly is installed in the nozzle body.

[0006] The present application can also include: 1. The opposing three-position high-speed electromagnetic valve comprises a methanol injection control fixed iron core, a methanol injection control coil skeleton, a pilot oil injection control fixed iron core, a pilot oil injection control coil skeleton, a control armature, and an inner opening needle valve; the methanol injection control coil skeleton is located above the pilot oil injection control coil skeleton, a methanol injection control coil is installed between the methanol injection control coil skeleton and the injector body outside the methanol injection control coil skeleton, a methanol injection control fixed iron core is installed inside the methanol injection control coil skeleton, a magnetic yoke and a first permanent magnet ring are installed above the methanol injection control coil skeleton; a pilot oil injection control coil is installed between the pilot oil injection control coil skeleton and the injector body outside the pilot oil injection control coil skeleton, a pilot oil injection control fixed iron core is installed inside the pilot oil injection control coil skeleton; a control armature is arranged between the pilot oil injection control fixed iron core and the methanol injection control fixed iron core, an armature return spring is installed between the control armature and the methanol injection control fixed iron core, the upper part of the inner opening needle valve passes through the pilot oil injection control fixed iron core and is located in the control armature, an armature buffer spring is sleeved on the inner opening needle valve, the armature buffer spring is located between the control armature and the pilot oil injection control fixed iron core, a methanol ring channel is formed between the inner opening needle valve and the pilot oil injection control fixed iron core, a fuel through hole is arranged in the control armature, a pilot oil passage is arranged in the injector body, the pilot oil passage is connected with a one-way pilot oil connector, and a second permanent magnet ring is arranged in the middle block of the injector below the pilot oil injection control coil skeleton.

[0007] 2. The inner and outer double opening nozzle assembly comprises an outer opening sleeve needle valve, a connecting sleeve, a ball valve, a valve seat block, and a multi-hole valve plate; the connecting sleeve is located outside the lower part of the inner opening needle valve and below the pilot oil injection control fixed iron core, the outer opening sleeve needle valve is installed outside the pilot oil injection control fixed iron core and the connecting sleeve, the valve seat block is installed at the bottom of the connecting sleeve, the ball valve is arranged between the bottom of the inner opening needle valve and the valve seat block, the valve seat block is fixed with the multi-hole valve plate, the valve seat block is fixed with the outer opening sleeve needle valve, the valve seat block moves up and down relative to the connecting sleeve, a multi-groove valve seat block is fixed in the nozzle body, a strip-shaped groove and a pilot oil ring channel are respectively formed between the outer opening sleeve needle valve, the multi-groove valve seat block, and the nozzle body, the pilot oil ring channel is connected with the strip-shaped groove and the pilot oil passage, a needle valve protrusion is arranged at the upper part of the outer opening sleeve needle valve, a sleeve needle valve return spring is sleeved on the outer opening sleeve needle valve, and the sleeve needle valve return spring is located between the needle valve protrusion and the nozzle body.

[0008] 3. The pre-tightening force of the armature return spring is greater than the pre-tightening force of the armature buffer spring.

[0009] 4、The closed magnetic flux generated by the second permanent magnet ring preferentially passes through the injector body, the outer wall of the pilot fuel injection control fixed iron core, the injector intermediate block, and the second permanent magnet ring, so that the outer wall of the pilot fuel injection control fixed iron core at the top extends rapidly reaches magnetic saturation, forcing the main magnetic flux generated when energized to pass more through the gap between the control armature and the pilot fuel injection control fixed iron core, thereby enhancing the electromagnetic force of the pilot fuel injection control fixed iron core. The residual magnetic flux generated by the second permanent magnet ring passes through the injector body, the control armature, the pilot fuel injection control fixed iron core, the injector intermediate block, and the second permanent magnet ring in sequence. In the pilot fuel injection mode, current is passed through the pilot fuel injection control coil inside the opposed three-position high-speed electromagnetic valve assembly. Under the action of the second permanent magnet ring, the pilot fuel injection control fixed iron core generates a stronger downward electromagnetic force to attract the control armature. The resultant force of the downward permanent magnetic force and the electromagnetic force is transmitted to the ball valve, the valve seat block, and the outward opening sleeve needle valve in sequence. The outward opening sleeve needle valve overcomes the pre-tightening force of the sleeve needle valve return spring to open downward. The outward opening sleeve needle valve and the lower end of the multi-groove valve seat block form a sealed ring belt opening. The pilot fuel passes through the pilot fuel passage, the pilot fuel ring channel, and the strip-shaped groove in sequence, and is sprayed from the gap between the outward opening sleeve needle valve and the multi-groove valve seat block. After injection, the methanol injection control coil is short-circuited, the methanol injection control fixed iron core generates an upward electromagnetic force to attract the control armature, the control armature drives the inward opening needle valve to move upward, and the outward opening sleeve needle valve moves upward under the action of the sleeve needle valve return spring until it contacts the multi-groove valve seat block and forms a sealed ring belt.

[0010] 5、The closed magnetic flux generated by the first permanent magnet ring preferentially passes through the magnetic yoke, the methanol injection control fixed iron core, the outer wall of the pilot fuel injection control fixed iron core, the injector body, and the first permanent magnet ring, so that the outer wall of the pilot fuel injection control fixed iron core at the top extends reaches magnetic saturation. The residual magnetic flux generated by the first permanent magnet ring passes through the magnetic yoke, the methanol injection control fixed iron core, the control armature, the injector body, and the first permanent magnet ring in sequence. In the methanol injection mode, the methanol injection control coil is energized. Under the action of the permanent magnetic field generated by the first permanent magnet ring and the electromagnetic field generated by the methanol injection control coil, the methanol injection control fixed iron core generates a stronger upward electromagnetic force to attract the control armature. The control armature, subjected to the resultant force of the upward permanent magnetic force and the electromagnetic force, overcomes the pre-tightening force of the armature return spring and the hydraulic pressure to move upward, drives the inward opening needle valve to lift, and the ball valve at the lower end of the inward opening needle valve opens. High-pressure methanol passes through the methanol passage, the fuel passage hole, and the methanol ring channel in sequence, and is finally sprayed from the injection hole on the multi-hole valve plate. After injection, the methanol injection control coil is de-energized, and the pilot fuel injection control coil is short-circuited. The pilot fuel injection control fixed iron core generates a downward electromagnetic force to attract the control armature, and the control armature drives the inward opening needle valve to seat.

[0011] The application has the advantages that: the application realizes integrated independent injection of methanol and pilot oil by the inner-outer double-opening nozzle assembly and the opposed three-position high-speed electromagnetic valve assembly, the methanol fuel is injected in large flow by the inner-opening needle valve control, the pilot oil is injected in trace by the outer-opening sleeve needle valve control, the cold start characteristics of the methanol engine are effectively improved, the permanent magnet and the cooperative excitation technology are coupled, the dynamic response characteristics of the injection of the two fuels are significantly improved, and the application has the advantages of compact structure and fast response speed. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Fig. 1 is a structural schematic diagram of the application; Figure 2 Fig. 2 is a structural schematic diagram of the opposed three-position high-speed electromagnetic valve assembly; Figure 3 Fig. 3 is a structural schematic diagram of the inner-outer double-opening nozzle assembly; Figure 4 Fig. 4 is a magnetic circuit schematic diagram of the working of the application.

[0013] Fig. 1 is a structural schematic diagram of the application; 1: methanol joint; 2: methanol passage; 3: magnetic yoke; 4: first permanent magnet ring; 5: injector main body; 6: opposed three-position high-speed electromagnetic valve assembly; 7: one-way pilot oil joint; 8: pilot oil passage; 9: second permanent magnet ring; 10: injector intermediate block; 11: connecting sleeve; 12: nozzle body; 13: inner-outer double-opening nozzle assembly.

[0014] 601: methanol injection control fixed iron core; 602: methanol injection control coil; 603: armature reset spring; 604: methanol injection control coil skeleton; 605: fuel through hole; 606: control armature; 607: armature buffer spring; 608: pilot oil injection control coil; 609: pilot oil injection control coil skeleton; 610: pilot oil injection control fixed iron core; 611: methanol ring channel; 612: inner-opening needle valve.

[0015] 1301: outer-opening sleeve needle valve; 1302: sleeve needle valve reset spring; 1303: pilot oil ring channel; 1304: ball valve; 1305: multi-groove valve seat block; 1306: strip-shaped groove; 1307: valve seat block; 1308: multi-hole valve plate. DETAILED DESCRIPTION

[0016] The application will be described in more detail below with examples combined with the drawings: Embodiment 1, combined with Figures 1-4The embodiment is composed of a methanol joint 1, a magnetic yoke 3, a first permanent magnet ring 4, an injector body 5, an opposed three-position high-speed electromagnetic valve assembly 6, a one-way pilot oil joint 7, a second permanent magnet ring 9, an injector intermediate block 10, a connecting sleeve 11, a nozzle body 12 and an inside-outside double opening nozzle assembly 13. The first permanent magnet ring 4 is located above the opposed three-position high-speed electromagnetic valve assembly 6. The opposed three-position high-speed electromagnetic valve assembly 6, the first permanent magnet ring 4 and the magnetic yoke 3 are installed in the injector body 5. The second permanent magnet ring 9 is located below the opposed three-position high-speed electromagnetic valve assembly 6. The second permanent magnet ring 9 is installed in the injector intermediate block 10. The injector intermediate block 10 is fixedly connected with the injector body 5 and the nozzle body 12 through threads. The inside-outside double opening nozzle assembly 13 is installed in the nozzle body 12. The methanol joint 1 is internally provided with a methanol passage 2 connected with the opposed three-position high-speed electromagnetic valve assembly 6. The injector body 5 and the injector intermediate block 10 are internally provided with a pilot oil passage 8 connected with the inside-outside double opening nozzle assembly 13.

[0017] The implementation 2 is based on the implementation 1, and the opposed three-position high-speed electromagnetic valve assembly 6 comprises a methanol injection control fixed iron core 601, a methanol injection control coil 602, a armature reset spring 603, a methanol injection control coil skeleton 604, a control armature 606, an armature buffer spring 607, an ignition oil injection control coil 608, an ignition oil injection control coil skeleton 609, and an inner opening needle valve 612. The methanol injection control fixed iron core 601 is fixedly connected with the methanol joint 1 and the magnetic yoke 3. The magnetic yoke 3 is installed at the top of the methanol injection control fixed iron core 601. The first permanent magnet ring 4 is sleeved outside the magnetic yoke 3. The methanol injection control coil 602 is wound on the methanol injection control coil skeleton 604. The methanol injection control fixed iron core 601 is installed in the methanol injection control coil skeleton 604. The ignition oil injection control coil 608 is wound on the ignition oil injection control coil skeleton 609. The ignition oil injection control fixed iron core 610 is installed in the ignition oil injection control coil skeleton 609. The methanol injection control coil 602 and the methanol injection control coil skeleton 604 are located above the ignition oil injection control coil 608 and the ignition oil injection control coil skeleton 609. The control armature 606 is provided with grooves for placing springs at both upper and lower ends. The armature reset spring 603 is installed above the control armature 606. The armature buffer spring 607 is sleeved at the top of the inner opening needle valve 612 and below the control armature 606. The control armature 606 is in the intermediate position under the pre-tightening force of the armature reset spring 603 and the armature buffer spring 607. The control armature 606 is provided with a fuel through hole 605 inside. The fuel through hole 605 is communicated with the methanol passage 2. The inner opening needle valve 612 is fixedly connected with the control armature 606. The ignition oil injection control fixed iron core 610 is fixedly connected with the methanol injection control fixed iron core 601, the injector intermediate block 10, and the connecting sleeve 11. The inner opening needle valve 612, the ignition oil injection control fixed iron core 610, and the connecting sleeve 11 cooperatively form a methanol ring channel 611. The methanol ring channel 611 is communicated with the fuel through hole 605 inside the control armature 606. The top of the ignition oil injection control fixed iron core 610 extends to the middle part of the methanol injection control coil skeleton 604. The ignition oil injection control fixed iron core 610 forms sealing surfaces with the methanol injection control coil skeleton 604, the ignition oil injection control coil skeleton 609, and the injector main body 5 respectively, so as to prevent methanol from entering the interiors of the methanol injection control coil 602 and the ignition oil injection control coil 608.

[0018] The implementation 3 is based on the implementation 2, and the pre-tightening force of the armature reset spring 603 is greater than the pre-tightening force of the armature buffer spring 607.

[0019] In embodiment 4, based on embodiment 1, the double-opening nozzle assembly 13 includes an outwardly opening sleeve needle valve 1301, a sleeve needle valve return spring 1302, a ball valve 1304, a multi-groove valve seat block 1305, a valve seat block 1307, and a multi-hole valve plate 1308. The ball valve 1304 is located at the bottom of the inwardly opening needle valve 612. Under the action of the armature return spring 603, the ball valve 1304 is pressed tightly against the valve seat block 1307. The valve seat block 1307 is fixedly connected to the multi-hole valve plate 1308. The outwardly opening sleeve needle valve 1301 is fixedly connected to the valve seat block 1307. The valve seat block 1307 and the connecting sleeve 11 can move up and down. The outwardly opening sleeve needle valve 1301 and the connecting sleeve 11, and the ignition fuel injection control... The iron core 610 is not fixed. The outward-opening sleeve needle valve 1301 cooperates with the nozzle body 12 to form a pilot fuel ring channel 1303. The pilot fuel ring channel 1303 connects the injector body 5 and the pilot fuel passage 8 set inside the injector intermediate block 10. The multi-groove valve seat block 1305 is fixedly connected to the nozzle body 12. The multi-groove valve seat block 1305 has multiple grooves distributed in a ring. The multi-groove valve seat block 1305 cooperates with the outward-opening sleeve needle valve 1301 to form a strip groove 1306. The sleeve needle valve return spring 1302 is sleeved on the upper end of the outward-opening sleeve needle valve 1301. Under the pre-tightening force of the sleeve needle valve return spring 1302, the outward-opening sleeve needle valve 1301 and the lower end of the multi-groove valve seat block 1305 form a sealing ring.

[0020] In implementation method 5, based on implementation method 1, in the ignition fuel injection mode, the closed magnetic flux generated by the second permanent magnet ring 9 preferentially passes through the injector body 5, the outer wall of the ignition fuel injection control fixed iron core 610, the injector intermediate block 10, and the second permanent magnet ring 9, such as... Figure 4 In As shown, this causes the portion extending from the top of the fuel injection control stator 610 to quickly reach magnetic saturation, and the stable bias magnetic field provided by the second permanent magnet ring 9 enables the closed magnetic flux. The permeability of the top extension of the ignition fuel injection control stator 610 in the circuit is significantly reduced, forcing more of the main magnetic flux generated when the ignition fuel injection control coil 608 is energized to pass through the gap between the control armature 606 and the ignition fuel injection control stator 610, thereby increasing the electromagnetic force of the ignition fuel injection control stator 610. At the same time, the residual magnetic flux generated by the second permanent magnet ring 9 is reduced. The fuel injection control coil 608 passes sequentially through the injector body 5, control armature 606, ignition fuel injection control stator 610, injector intermediate block 10, and second permanent magnet ring 9, further enhancing the initial magnetic force of the ignition fuel injection control stator 610 on the control armature 606. When the ignition fuel injection control coil 608 is energized, the second permanent magnet ring 9 reduces the permeability of the top extension of the ignition fuel injection control stator 610, thus increasing the main magnetic flux generated by the energization of the ignition fuel injection control coil 608. More by controlling the gap between the armature 606 and the pilot oil injection control fixed iron core 610, under the coupling superposition of the permanent magnetic field generated by the second permanent magnetic ring 9 and the electromagnetic field generated by the pilot oil injection control coil 608, the pilot oil injection control fixed iron core 610 generates a stronger downward electromagnetic force to attract the control armature 606, and the resultant force of the downward permanent magnetic force and the electromagnetic force is sequentially transmitted to the ball valve 1304, the valve seat block 1307 and the outer opening sleeve needle valve 1301, the outer opening sleeve needle valve 1301 rapidly opens downward against the pre-tightening force of the sleeve needle valve return spring 1302, and the outer opening sleeve needle valve 1301 and the lower end of the multi-groove valve seat block 1305 form a sealing ring belt to open, and the pilot oil sequentially passes through the pilot oil passage 8, the pilot oil ring 1303 and the strip-shaped groove 1306, and is injected through the gap between the outer opening sleeve needle valve 1301 and the multi-groove valve seat block 1305, after the injection is completed, the methanol injection control coil 602 is short-circuited, the methanol injection control fixed iron core 601 generates an upward electromagnetic force to attract the control armature 606, the control armature 606 drives the inner opening needle valve 612 to move upward rapidly, and the outer opening sleeve needle valve 1301 moves upward under the action of the sleeve needle valve return spring 1302 until it contacts the multi-groove valve seat block 1305 and forms a sealing ring belt, and the pilot oil injection is ended.

[0021] In embodiment 6, on the basis of embodiment 1, in the methanol injection mode, the closed magnetic flux generated by the first permanent magnetic ring 4 preferentially passes through the magnetic yoke 3, the methanol injection control fixed iron core 601, the outer wall of the pilot oil injection control fixed iron core 610, the injector main body 5 and the first permanent magnetic ring 4, as shown in Figure 4 , which will make the part of the pilot oil injection control fixed iron core 610 extending at the top quickly reach magnetic saturation, and the stable bias magnetic field provided by the first permanent magnetic ring 4 will make the permeability of the part of the pilot oil injection control fixed iron core 610 extending at the top significantly decrease, and then more main magnetic flux generated when the methanol injection control coil 602 is energized will pass through the gap between the methanol injection control fixed iron core 601 and the control armature 606, so as to improve the electromagnetic force, in addition, the residual magnetic flux generated by the first permanent magnetic ring 4 will sequentially pass through the magnetic yoke 3, the methanol injection control fixed iron core 601, the control armature 606, the injector main body 5 and the first permanent magnetic ring 4, further improving the initial magnetic force of the methanol injection control fixed iron core 601 to the control armature 606, and when the methanol injection control coil 602 is energized, the main magnetic flux generated by the methanol injection control coil 602 ​More by controlling the armature 606 and methanol injection control fixed iron core 601 gap, the first permanent magnet ring 4 generated by the permanent magnet field and methanol injection control coil 602 generated by the electromagnetic field coupling superposition, methanol injection control fixed iron core 601 generates stronger upward electromagnetic force adsorption control armature 606, control armature 606 and inner opening needle valve 612 together overcome the pre-tightening force of armature return spring 603, hydraulic force upward movement, inner opening needle valve 612 lower end ball valve 1304 open, high pressure methanol through methanol passage 2, fuel through hole 605, methanol ring channel 611, finally by the injection hole on the porous valve plate 1308, injection, after the completion of methanol injection, methanol injection control coil 602 is de-energized, pilot oil injection control coil 608 short time power, pilot oil injection control fixed iron core 610 generates downward electromagnetic force adsorption control armature 606, control armature 606 driven inner opening needle valve 612 quickly seat, under the action of armature buffer spring 607, slow down the impact strength of inner opening needle valve 612 when seat, when the ball valve 1304 seat in the multi-groove valve seat block 1305, end methanol injection.

[0022] The application adopts inner and outer double opening nozzle assembly 13 and opposing three position high speed electromagnetic valve assembly 6 to realize integrated injection of methanol and pilot oil, the methanol fuel uses inner opening needle valve 612 control to realize large flow injection, the pilot oil uses outer opening sleeve needle valve 1301 control to realize micro injection, in addition, the first permanent magnet ring 4 and the second permanent magnet ring 9 cooperate to excite, which significantly improves the fuel injection response characteristics, and has the advantages of compact structure and fast response speed.

Claims

1. A high-pressure methanol dual-fuel injector with internal and external double-opening needle valve based on electromagnetic-permanent magnet coupling, characterized in that: It includes a methanol connector, an injector body, an injector intermediate block, and a nozzle body. The methanol connector is installed on the top of the injector body. The injector body and the nozzle body are connected through the injector intermediate block. An opposed three-position high-speed solenoid valve assembly is installed inside the injector body. A one-way pilot fuel connector is installed on the side of the injector body. An internal and external double-opening nozzle assembly is installed inside the nozzle body.

2. The high-pressure methanol dual-fuel injector with internal and external double-opening needle valve based on electromagnetic-permanent magnet coupling according to claim 1, characterized in that: The opposed three-position high-speed solenoid valve includes a methanol injection control stator core, a methanol injection control coil frame, a ignition fuel injection control stator core, a ignition fuel injection control coil frame, a control armature, and an internally opening needle valve. The methanol injection control coil frame is located above the pilot fuel injection control coil frame. The methanol injection control coil is installed between the methanol injection control coil frame and the injector body outside it. A methanol injection control stator is installed inside the methanol injection control coil frame. A magnetic yoke and a first permanent magnet ring are installed above the methanol injection control coil frame. A pilot fuel injection control coil is installed between the pilot fuel injection control coil frame and the injector body outside it. A pilot fuel injection control stator is installed inside the pilot fuel injection control coil frame. A control mechanism is set between the pilot fuel injection control stator and the methanol injection control stator. An armature is controlled, and an armature return spring is installed between the armature and the methanol injection control stationary iron core. The upper part of the internally open needle valve passes through the pilot fuel injection control stationary iron core and is located inside the control armature. An armature buffer spring is fitted on the internally open needle valve. The armature buffer spring is located between the control armature and the pilot fuel injection control stationary iron core. A methanol loop is formed between the internally open needle valve and the pilot fuel injection control stationary iron core. A fuel passage is opened in the control armature. A pilot fuel passage is set in the injector body. The pilot fuel passage is connected to a one-way pilot fuel connector. A second permanent magnet ring is set in the middle block of the injector below the pilot fuel injection control coil frame.

3. The high-pressure methanol dual-fuel injector with internal and external double-opening needle valve based on electromagnetic-permanent magnet coupling according to claim 1, characterized in that: The double-opening nozzle assembly includes an outward-opening sleeve needle valve, a connecting sleeve, a ball valve, a valve seat block, and a multi-hole valve plate. The connecting sleeve is located outside the lower part of the inward-opening needle valve and below the pilot fuel injection control fixed iron core. The outward-opening sleeve needle valve is installed outside the pilot fuel injection control fixed iron core and the connecting sleeve. The valve seat block is installed at the bottom of the connecting sleeve. A ball valve is installed between the bottom of the inward-opening needle valve and the valve seat block. A multi-hole valve plate is fixed in the valve seat block. The valve seat block is fixed to the outward-opening sleeve needle valve and can move up and down between the valve seat block and the connecting sleeve. A multi-groove valve seat block is fixed in the nozzle body. A strip groove and a pilot fuel ring channel are formed between the outward-opening sleeve needle valve, the multi-groove valve seat block, and the nozzle body, respectively. The pilot fuel ring channel connects the strip groove and the pilot fuel passage, respectively. A needle valve protrusion is provided on the upper part of the outward-opening sleeve needle valve. A sleeve needle valve return spring is sleeved on the outward-opening sleeve needle valve and is located between the needle valve protrusion and the nozzle body.

4. A high-pressure methanol dual-fuel injector with internal and external double-opening needle valve based on electromagnetic-permanent magnet coupling as described in claim 1, characterized in that: The preload of the armature return spring is greater than the preload of the armature buffer spring.

5. A high-pressure methanol dual-fuel injector with internal and external double-opening needle valve based on electromagnetic-permanent magnet coupling according to claim 1, characterized in that: The closed magnetic flux generated by the second permanent magnet ring preferentially passes through the injector body, the outer wall of the ignition fuel injection control stator core, the injector intermediate block, and the second permanent magnet ring. This causes the outer wall of the ignition fuel injection control stator core to quickly reach magnetic saturation, forcing more of the main magnetic flux generated when energized to pass through the gap between the control armature and the ignition fuel injection control stator core, thereby increasing the electromagnetic force of the ignition fuel injection control stator core. The residual magnetic flux generated by the second permanent magnet ring passes sequentially through the injector body, control armature, ignition fuel injection control stator core, injector intermediate block, and the second permanent magnet ring. In ignition fuel injection mode, current is energized into the ignition fuel injection control coil inside the opposed three-position high-speed solenoid valve assembly. Under the action of the second permanent magnet ring, the ignition fuel injection control stator core... A stronger downward electromagnetic force is generated to attract the control armature. The combined force of the downward permanent magnet force and the electromagnetic force is transmitted sequentially to the ball valve, the valve seat block, and the outward-opening sleeve needle valve. The outward-opening sleeve needle valve overcomes the preload force of the sleeve needle valve return spring and opens downward. The lower end of the outward-opening sleeve needle valve and the multi-groove valve seat block form a sealing ring. The pilot fuel passes sequentially through the pilot fuel passage, the pilot fuel ring, and the strip groove, and is sprayed out through the gap between the outward-opening sleeve needle valve and the multi-groove valve seat block. After the injection is completed, the methanol injection control coil is briefly energized. The methanol injection control stator core generates an upward electromagnetic force to attract the control armature. The control armature drives the inward-opening needle valve to move upward. The outward-opening sleeve needle valve moves upward under the action of the sleeve needle valve return spring until it contacts the multi-groove valve seat block and forms a sealing ring.

6. A high-pressure methanol dual-fuel injector with internal and external double-opening needle valve based on electromagnetic-permanent magnet coupling according to claim 1, characterized in that: The closed magnetic flux generated by the first permanent magnet ring preferentially passes through the yoke, the methanol injection control stator core, the outer wall of the ignition fuel injection control stator core, the injector body, and the first permanent magnet ring, causing magnetic saturation at the outer wall of the top extension of the ignition fuel injection control stator core. The residual magnetic flux generated by the first permanent magnet ring sequentially passes through the yoke, the methanol injection control stator core, the control armature, the injector body, and the first permanent magnet ring. In methanol injection mode, the methanol injection control coil is energized. Under the influence of the permanent magnetic field generated by the first permanent magnet ring and the electromagnetic field generated by the methanol injection control coil, the methanol injection control stator core... The iron core generates a stronger upward electromagnetic force to attract the control armature. The control armature, subjected to the combined force of the upward permanent magnet force and the electromagnetic force, overcomes the preload of the armature return spring and the hydraulic pressure to move upward, causing the internally open needle valve to lift. The ball valve at the lower end of the internally open needle valve opens, and high-pressure methanol passes through the methanol passage, fuel passage, and methanol loop in sequence, and is finally ejected from the nozzle on the multi-hole valve plate. After the injection is completed, the methanol injection control coil is de-energized, and the ignition fuel injection control coil is briefly energized. The ignition fuel injection control iron core generates a downward electromagnetic force to attract the control armature, and the control armature causes the internally open needle valve to sit down.

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