High-pressure-difference methanol ejector for ship engine

Abstract

The invention relates to the technical field of methyl alcohol fuel injection system injectors, in particular to a high-pressure-difference methyl alcohol injector for a ship engine, which comprises a gland, an electromagnetic valve assembly, a shell, an ejector rod, a spring, a range limiting disc, a valve body, a valve core bushing, an orifice plate and a valve seat. According to the methanol injector, the fuel inlet is laterally arranged, and the overall flow direction of fuel is side-in and bottom-out, so that the leakage phenomenon possibly caused by insufficient coaxiality of external pipe joints in a conventional fuel jacking installation mode is avoided, and the sealing of an engine cannot be influenced even under severe working conditions such as continuous vibration; according to the methanol injector, methanol supply pressure (hydraulic pressure) is used for assisting in opening of the valve element of the methanol injector, compared with an injector with a conventional direct-drive electromagnetic valve opening valve element, the structure can achieve opening of the methanol injector only through smaller electromagnetic force and lower power consumption, and higher methanol injection pressure can be achieved after the spring and the supply pressure are accurately matched; and more efficient atomization can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of methanol fuel injection systems for marine engines, and particularly to a high-pressure differential methanol injector for marine engines. Background Art

[0002] As is well known, ship carbon reduction plays a very important role in addressing global warming. Applying low-carbon and zero-carbon alternative energy sources is an important path for green shipping. Among them, methanol is one of the widely recognized important alternative fuels. In recent years, with the increasingly prominent huge advantage of near-zero carbon emissions of green methanol, the demand for methanol-powered ships has increased rapidly, and methanol engines have become the "new favorites" in the shipbuilding market. Represented by the technical route solution of injecting methanol into the intake port, it can be directly modified on the original diesel engine, and has the characteristics of short cycle, low cost, and excellent adaptability, so it is favored by major engine manufacturers and shipowners.

[0003] As one of the key actuators of the fuel injection system for marine engines, the intake port methanol injector is used to efficiently supply methanol fuel into the engine cylinder for full combustion, so that the engine can complete continuous power output. At present, there are relatively few methanol fuel injectors dedicated to large-power marine engines on the market, and most of them show poor atomization effect and inconvenient maintenance due to high integration. Therefore, developing a methanol injector dedicated to large-power marine methanol engines with good atomization effect and convenient maintenance is crucial for both the market application of methanol fuel engines and the smooth realization of the emission reduction goals of the entire marine shipping industry. Summary of the Invention

[0004] The present invention provides a high-pressure differential methanol injector for marine engines, which can efficiently atomize methanol by increasing the injection pressure, and has the characteristics of good atomization effect, high reliability, and convenient later maintenance.

[0005] The technical solution of the present invention is as follows: A high-pressure differential methanol injector for marine engines, comprising: a gland, a solenoid valve assembly, a housing, a push rod, a spring, a limit disk, a valve body, a valve core bushing, a spray hole plate, and a valve seat; The gland, the housing, and the valve core bushing are detachably connected from top to bottom to form a press-fitting cavity with an open bottom; In the press-fitting cavity, the spray hole plate is arranged at the opening of the valve core bushing, the valve seat is arranged above the spray hole plate, the limit disk is arranged above the valve seat, the spring is limited between the push rod and the limit disk, the lower end of the push rod passes through the limit disk and is connected to the valve body in the valve seat, the upper end of the push rod is connected to the solenoid valve assembly, and a pressure accumulation cavity is formed between the valve body and the valve seat; A fuel inlet is provided on the housing. After the methanol fuel enters the housing through the fuel inlet, it then passes through the valve seat and enters the pressure accumulation chamber formed between the valve seat and the valve body. Under the combined action of the electromagnetic force provided by the solenoid valve assembly and the methanol supply pressure in the pressure accumulation chamber, the valve body moves together with the push rod, creating a gap between the valve body and the valve seat. The methanol fuel in the pressure accumulation chamber passes through this gap and sprays outwards from the spray holes of the spray hole plate.

[0006] Preferably, the high-pressure differential methanol injector for a marine engine further includes: A limit seat, which is arranged at the top end of the push rod. By adjusting the height of the limit seat, the magnitude of the electromagnetic force of the solenoid valve assembly on the push rod can be adjusted.

[0007] Preferably, the solenoid valve assembly includes: an armature, a solenoid valve, and a yoke, which are arranged in sequence from top to bottom; The upper end of the push rod passes through the yoke and the solenoid valve and is fixed to the armature.

[0008] Preferably, a boss is provided at the upper end of the armature, and there is a clearance fit between the outer circle and the inner hole of the boss; A plurality of balance holes are uniformly arranged axially between the upper and lower end faces of the armature.

[0009] Preferably, the solenoid valve includes: an explosion-proof plug, an electromagnetic coil, a skeleton, a stainless steel thin-walled sleeve, and an iron core; The stainless steel thin-walled sleeve wraps around the outer surface of the skeleton that is in direct contact with the methanol fuel; The yoke is attached to the bottom end of the iron core.

[0010] Preferably, an outer circle boss is provided on the push rod, and a spring is connected between the limit disc and the outer circle boss, and the spring is sleeved on the push rod.

[0011] Preferably, a kidney-shaped diversion hole is provided on the limit disc, and a circular diversion hole is provided on the valve seat. The circular diversion hole and the kidney-shaped diversion hole are coaxially arranged.

[0012] Preferably, the spray hole plate is an equal-thickness thin plate with a thickness of 0.8 - 1.2 mm, and a plurality of micro-holes with a pore diameter of 0.6 - 0.8 mm are drilled on the spray hole plate; An included angle is left between the micro-holes during processing, and the included angle enables the methanol fuel to spray circumferentially and / or unidirectionally.

[0013] Preferably, the lower end of the housing extends into the interior of the valve core bushing and is threadedly connected; The gland is pressed on the upper end of the housing and is threadedly connected to the housing by screws.

[0014] Preferably, the methanol fuel in the pressure accumulation chamber is sealed between the valve body and the valve seat through line contact.

[0015] Preferably, filters with different filtration diameters are welded at the methanol fuel inlet.

[0016] The beneficial effects of the present invention are as follows: Under normal circumstances, the valve body is subject to a downward thrust from the methanol supply pressure, but this thrust is balanced by the upward elastic force of the spring, keeping the valve body in a closed state. After the solenoid valve assembly is energized, the electromagnetic force acts downward on the valve body through the push rod; at this time, the electromagnetic force only needs to overcome the elastic force of the spring, rather than directly opposing the methanol supply pressure. In fact, the methanol supply pressure helps the electromagnetic force to complete the opening action of the valve body to a certain extent. Since the electromagnetic force only needs to overcome the elastic force of the spring and does not need to directly oppose the methanol pressure, when the methanol injector needs to be opened, only a smaller electromagnetic force and less power consumption are required. The methanol fuel entering the pressure accumulation chamber is compressed when the valve body is closed, and the pressure gradually increases. After passing through the precise spring and methanol supply pressure, a higher methanol injection pressure can be obtained. A higher injection pressure means that the flow rate of the methanol fuel at the nozzle plate is faster; according to the principle of fluid mechanics, the higher the flow rate, the better the atomization effect of the fuel; therefore, the methanol fuel ejected at high speed is torn into finer droplets at the nozzle, thus achieving more efficient atomization. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the high-pressure difference methanol injector according to the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the armature, push rod and valve body in the embodiment of the present invention; Figure 3 It is a schematic structural diagram of the stroke limit disk in the embodiment of the present invention; Figure 4 It is a schematic structural diagram of the valve core bushing in the embodiment of the present invention; Figure 5 It is a schematic structural diagram of the valve seat in the embodiment of the present invention; Description of the reference numerals: 1 - gland; 2 - limit seat; 3 - armature; 31 - exhaust hole; 32 - boss; 4 - solenoid valve; 5 - yoke; 6 - housing; 7 - push rod; 71 - side flat; 72 - outer circular boss; 8 - spring; 9 - stroke limit disk; 91 - lower spring seat; 92 - waist-shaped diversion hole; 10 - valve body; 11 - nozzle plate; 12 - valve core bushing; 121 - inner hole of the third shaft section; 122 - thread; 123 - side flat; 13 - valve seat; 131 - circular diversion hole; 132 - valve seat sealing surface; 133 - guiding hole; 101 - side flat; 102 - valve body sealing surface; 14 - O-ring; 15 - O-ring; 16 - O-ring 17 - O-ring; 18 - O-ring; 19 - hexagon socket head cap screw; 20 - hexagon socket head cap screw. Detailed Embodiments

[0018] For the convenience of those skilled in the art, the following further describes and explains this invention patent through the attached drawings. The description is relatively detailed and complete, but it should not be construed as a limitation on the scope of this invention patent. Obvious deformations and replacement forms of the following examples are all within the protection scope of this patent.

[0019] The embodiment of the present application provides a high-pressure-difference methanol injector for a marine engine.

[0020] "High pressure difference" mainly refers to the difference between the methanol fuel pressure in the pressure accumulation cavity and the external environment pressure of the nozzle plate. The high pressure difference enables the methanol fuel to be ejected through the nozzle plate at a higher speed, thereby achieving more efficient injection; the high pressure difference can also cause the methanol fuel to be torn into finer droplets when ejected, thereby achieving more efficient atomization and improving the combustion efficiency.

[0021] Refer to Figure 1 , this high-pressure-difference methanol injector includes: gland 1, solenoid valve assembly, housing 6, push rod 7, spring 8, stroke limit disc 9, valve body 10, valve core bushing 12, nozzle plate 11 and valve seat 13.

[0022] Combined with Figure 1 , the gland 1, housing 6 and valve core bushing 12 are detachably connected from top to bottom and form a press-fitting cavity with an open bottom. Among them, the upper part of the gland 1 is designed to be closed, the housing 6 is designed with a hollow structure, the valve core bushing 12 is designed in a U shape, and the lower opening of the valve core bushing 12 is for the methanol fuel to be ejected. The press-fitting cavity formed inside the gland 1, housing 6 and valve core bushing 12 is used to install other components. The detachable connection method of the gland 1, housing 6 and valve core bushing 12 makes the maintenance and component replacement of this methanol injector more convenient. When it is necessary to repair the components inside the press-fitting cavity, the gland can be removed to replace or repair the components inside the housing.

[0023] The solenoid valve assembly is pressed by the gland against the upper end face of the housing 1. The gland 1 and the housing 6 are fixedly connected by four socket head cap screws 19. From bottom to top, the gland 1 has a first counterbore and a second counterbore, and there are four flow channels between the first counterbore and the second counterbore; the gland 1 is provided with four evenly distributed countersunk holes, and the gland is fixed to the housing 6 by passing four socket head cap screws 19 through the countersunk holes; a groove for installing an O-ring 18 is opened at the bottom end of the gland 1, and a first inner cavity seal is formed with the upper end face of the solenoid valve assembly through the O-ring 18.

[0024] Combined with Figure 1Looking at the press-fitting cavity, the nozzle plate 11 is arranged at the opening of the valve core bushing 12, the valve seat 13 is arranged above the nozzle plate 11, the stroke-limiting disc 9 is arranged above the valve seat 13, the spring 8 is limited between the push rod 7 and the stroke-limiting disc 9, the lower end of the push rod 7 passes through the stroke-limiting disc 9 and is connected to the valve body 10 within the valve seat 13, and the upper end of the push rod 7 is connected to the solenoid valve assembly; a fuel inlet is provided on the housing 6, and after the methanol fuel enters the housing 6 from the fuel inlet, it then passes through the valve seat 13 and enters the pressure accumulation cavity formed between the valve seat 13 and the valve body 10.

[0025] The valve body 10 is fixedly connected to the lower end of the push rod 7 through the thread machined on the part itself.

[0026] The nozzle plate 11 is an equal-thickness thin plate with a thickness of 0.8 - 1.2 mm, and multiple micro-holes with a diameter of 0.6 - 0.8 mm are drilled on it. There are included angles left between the micro-holes during processing, and micro-hole drilling or electric discharge machining is used. The included angles include, but are not limited to, circumferential spraying and one-way spraying.

[0027] The internal parts of the methanol injector are designed in a split form, and the product can be disassembled, assembled, repaired, and maintained without damaging any parts, which can better improve the assemblability of the methanol injector and reduce the later maintenance cost.

[0028] The first shaft section of the housing 6 from bottom to top is provided with an external thread, which is matched with the internal thread of the second shaft section of the valve core bushing 12 to play a fixing role; and the inside of the first shaft section of the housing is sealed between the O-ring 14 and the valve core bushing 12. At the upper end of the first shaft section of the housing, there are O-ring 15 and O-ring 16 respectively. Four waist-shaped through holes evenly distributed between O-ring 15 and O-ring 16 are the methanol fuel inlets.

[0029] The methanol injector adopts an insert-type installation design. During maintenance, the entire methanol injector can be pulled out by simply removing the pressure plate, which has the characteristics of convenient disassembly and assembly and high sealing reliability. In addition, the insert-type installation design avoids the leakage phenomenon that may occur due to insufficient coaxiality of the external pipe connection in the conventional fuel pushing-in installation design, thus ensuring that the seal will not be affected even under the continuous vibration of the engine.

[0030] A double-layer filter screen is welded at the methanol fuel inlet. Among them, the outer layer is a fine filter screen and the inner layer is a coarse filter screen, which effectively filters the methanol fuel entering the injector.

[0031] The outer diameter of the second shaft section of the housing 6 from bottom to top is larger than the outer diameter of the first shaft section, and the inner hole of the second shaft section of the housing 6 is mainly used to place the solenoid valve assembly.

[0032] A groove is left at the lower part of the outer circle of the second shaft section of the housing 6, and the groove is used to place the fixing pressure plate to fixedly install the methanol injector on the engine intake manifold.

[0033] Under the combined action of the electromagnetic force provided by the solenoid valve assembly and the methanol supply pressure in the accumulator chamber, the valve body 10 moves together with the push rod 7, forming a gap between the valve body 10 and the valve seat 13. The methanol fuel in the accumulator chamber passes through this gap and sprays out from the spray holes of the spray hole plate 11.

[0034] Due to the balance mechanism of the spring and the methanol supply pressure, the electromagnetic force required by the solenoid valve assembly is significantly reduced. This means that the solenoid valve assembly consumes less electrical energy during operation, thereby reducing the energy consumption of the entire injection system; during the long-term operation of a marine engine, this low-energy consumption design can significantly reduce operating costs, especially when applied on a large scale, and the energy-saving effect is particularly obvious. The efficient atomization effect enables the methanol fuel to burn more fully, reducing the emission of unburned fuel. It not only improves the combustion efficiency but also significantly reduces the emission of harmful gases (such as carbon monoxide, hydrocarbons, etc.).

[0035] As Figure 1 shown, the high-pressure differential methanol injector for a marine engine further includes: A limit seat 2, which is arranged at the top end of the push rod 7. By adjusting the height of the limit seat 2, the magnitude of the electromagnetic force of the solenoid valve assembly on the push rod 7 can be adjusted.

[0036] As Figure 1 shown, the solenoid valve assembly includes: an armature 3, a solenoid valve 4, and a yoke 5 arranged in sequence from top to bottom; The upper end of the push rod 7 passes through the yoke 5 and the solenoid valve 4 and is fixed to the armature 3.

[0037] As Figure 2 shown, the armature 3 and the limit seat 2 are connected to the upper end of the push rod 7 by an internal hexagon socket head screw 20, and the armature 3, the push rod 7, and the valve body 10 are an integral body.

[0038] The yoke 3 is placed at the bottom end of the solenoid valve 4, and the diameters of its outer circle and inner hole are close to the iron core of the solenoid valve 4, which is used to increase the magnetic circuit of the electromagnetic coil of the solenoid valve assembly, thereby improving the utilization rate of the electromagnetic force.

[0039] The solenoid valve 4 includes: an explosion-proof plug, an electromagnetic coil, a skeleton, a stainless steel thin-walled sleeve, and an iron core; the stainless steel thin-walled sleeve is wrapped around the outer surface of the skeleton that is in direct contact with the methanol fuel, and its purpose is to physically isolate the methanol from the skeleton and prevent corrosion; the yoke iron 5 is attached to the bottom end of the iron core; an O-ring seal 17 is used for sealing between the low end of the iron core and the housing 6. The iron core is placed inside the inner hole of the skeleton and has an interference fit with the stainless steel thin-walled sleeve. The upper end surface of the iron core is higher than the outer surface of the stainless steel thin-walled sleeve at the upper end of the skeleton. There is a relatively large gap between the inner hole of the iron core and the ejector rod 7, and they do not come into contact with each other during the operation of the methanol injector. The upper and lower end surfaces of the skeleton are pressed tightly by the seals installed in the gland 1 and the housing 6 to form a seal, and the aviation plug is placed on one side of the housing 6.

[0040] In this solution, the skeleton, the electromagnetic coil, and the aviation plug are separately encapsulated into one component and placed inside the housing 6 by means of press-fitting with the gland 1. When a fault occurs in the product, it can be disassembled for repair and maintenance of the parts, and there is no need to replace the entire methanol injector, which greatly improves the assemblability of the methanol injector and reduces the later maintenance cost.

[0041] When the methanol injector is in the open state, the gap between the armature 3 and the iron core of the solenoid valve 4 is the air gap, and the air gap between the armature 3 and the iron core is adjusted by grinding the thickness of the limit seat 2.

[0042] As Figure 2 shown, a boss 32 is left at the upper end of the armature 3, and an inner hole is provided at the bottom of the gland 1. There is a clearance fit between the outer circle of the boss 32 and the inner hole of the gland 1, which plays a role in upper-end guidance. Four exhaust holes 31 are evenly distributed along the axial direction of the armature 3 to balance the pressure between the upper and lower end surfaces of the armature 3.

[0043] As Figures 1 to 3 shown, an internal threaded hole is opened at the upper end of the ejector rod 7. The armature 3 and the limit seat 2 are fixed to the upper end of the ejector rod 7 by an inner hexagon socket head screw 20. An outer circular boss 72 is left in the middle and lower part of the ejector rod 7. The clearance between the lower end surface of the outer circular boss 72 and the upper end surface of the limit disc 9 is the lift, that is, the opening degree of the methanol injector, which directly affects the size of the methanol flow rate. The size of this lift is adjusted by grinding the upper end surface of the limit disc 9. A side flat 71 opposite to the fuel inlet is also provided on the ejector rod 7.

[0044] As Figures 2 to 3As shown in the figure, the first shaft section of the valve body 10 from top to bottom is an externally threaded cylinder, which is fixedly connected by threaded connection with the inner hole at the bottom end of the ejector rod 7. The second shaft section of the valve body 10 has two side flats 101 milled on the outside, and the third shaft section has two transition valve body sealing surfaces 102, which form a line seal with the valve seat 13, and the methanol injector is closed through the pressing action of the spring 8. There are two side flats milled above the outer circular boss 72 of the ejector rod 7 and on the outside of the second shaft section of the valve seat 13. The side flats play a clamping role when the ejector rod 7 is connected and tightened with the valve body 10 and between the ejector rod 7 and the armature 3. In addition, the limit seat 2 is placed between the ejector rod 7 and the armature 3. By grinding the limit seat 2, the air gap between the armature 3 and the iron core of the solenoid valve assembly 4 can be adjusted. The air gap can be controlled at the micron level by grinding, so as to better achieve the injection consistency of multi-cylinder methanol fuel.

[0045] As Figures 1 to 4 shown in the figure, the valve body 10, the ejector rod 7, the limit seat 2, and the armature 3 are connected as a whole. After the solenoid valve assembly 4 is energized, the armature 3 is attracted by the iron core of the solenoid valve assembly 4 and moves downward. Under the action of the limit disc 9, the valve body 10 moves downward by a certain distance, and this distance is the lift of the methanol injector. The lift is directly related to the size of the flow rate. The lift can be adjusted by grinding the upper end face of the limit disc 9, and this lift can also be controlled at the micron level, so as to ensure that the methanol injectors produced in the same batch have good flow rate consistency.

[0046] As Figure 3 shown in the figure, the first shaft section of the limit disc 9 from bottom to top has four uniformly distributed kidney-shaped diversion grooves 92, and the inner side of the kidney-shaped diversion grooves 92 is closely attached to the outer cylindrical wall surface of the second shaft section; the kidney-shaped diversion grooves 92 are communicated with the circular diversion holes 132 of the valve seat 13, and the third shaft end is the lower spring seat 91, and its outer diameter is the same as the inner hole diameter of the spring 8, which is used to fix the lower end of the spring 8.

[0047] As Figure 5 shown in the figure, the upper through hole of the valve seat 13 and the cylinder at the lower part of the ejector rod 7 are in clearance fit, which plays a guiding role at the lower end. The upper guiding and the lower guiding together form two-stage guiding for the movement of the valve core. The valve seat 13 has four uniformly distributed circular diversion holes 131 axially opened from the upper end face. By coaxially installing with the kidney-shaped diversion holes 91 of the limit disc 9, the methanol fuel accumulated in pressure in the inner cavity of the shell is guided to the valve core part. A guiding hole 133 is provided on the valve seat 13 to guide the movement of the ejector rod 7.

[0048] As Figure 4 shown in the figure, two side flats 123 are milled on the outside of the valve core bushing 12. Using tools to clamp the side flats 123, it can be screwed onto the shell 6. The inner hole of the first shaft section of the valve core bushing 12 from bottom to top is in clearance fit with the spray hole plate 11 and the outer circle of the valve seat 13. The inner hole of the second shaft section has a thread 122, which is used in cooperation with the screw at the lower part of the shell 6. The inner hole 121 of the third shaft section is in cooperation with the O-ring at the lower end of the shell 6 to form a seal.

[0049] As Figure 5 shown, a step is left at the bottom end of the valve core bushing 12, and this step is used to tightly press and fix the nozzle plate 11 and the valve seat 13 at the lower end of the housing 6, forming the valve opening and closing functions of the methanol injector.

[0050] As Figures 1 to 5 shown, the methanol fuel hydraulic pressure acts on the valve body sealing surface 102, and this direction is the same as the movement direction when the valve body 10 opens, which can be used as a compensation force when opening, helping the methanol injector to open under high pressure, so as to better realize the atomization of methanol fuel.

[0051] In the embodiment of the present application, the way for the methanol injector to achieve the closed state is as follows: the valve body 10 is pressed on the valve seat 13 under the upward spring force, and the sealing is realized through the line contact between the valve body 10 and the valve seat sealing surface 132. The effective sealing pressure of the methanol injector is lower than the load force of the spring 8.

[0052] In the embodiment of the present application, the opening injection pressure of the methanol injector is directly related to the methanol supply pressure, that is, the greater the methanol supply pressure acting on the seat surface of the valve body 10, the greater the injection pressure when opening. After precise matching of the spring 8, medium and high pressure injection of 2-4 MPa can be carried out in the intake passage. Compared with the direct-acting injector with a conventional injection pressure of 1 MPa, the Sauter diameter of the methanol fuel injected by the methanol injector is smaller, so as to realize the efficient atomization of methanol fuel, and finally improve the mixing degree of methanol fuel with air in the intake passage and the combustion effect in the cylinder.

[0053] Under normal circumstances, the valve body 10 is subjected to the downward thrust of the methanol supply pressure, but this thrust is balanced by the upward elastic force of the spring 8, so that the valve body 10 remains in the closed state. After the solenoid valve assembly is powered on, the electromagnetic force acts on the valve body 10 downward through the push rod 7; at this time, the electromagnetic force only needs to overcome the elastic force of the spring, and does not need to directly resist the methanol supply pressure. The methanol supply pressure actually helps the electromagnetic force to complete the opening action of the valve body 10 to a certain extent. Since the electromagnetic force only needs to overcome the elastic force of the spring 8 and does not need to directly resist the methanol pressure, when the methanol injector needs to be opened, only a smaller electromagnetic force and less power consumption are required. The methanol fuel entering the accumulator cavity is compressed when the valve body 10 is closed, and the pressure gradually increases. After precise matching of the spring 8 and the methanol supply pressure, a higher methanol injection pressure can be obtained. A higher injection pressure means that the flow rate of the methanol fuel at the nozzle plate is faster; according to the principle of fluid mechanics, the higher the flow rate, the better the atomization effect of the fuel; therefore, the methanol fuel ejected at high speed is torn into finer droplets at the nozzle, so as to realize more efficient atomization.

[0054] In addition, the methanol injector in this embodiment has the fuel inlet located on the side, and the overall fuel flow direction is from the side in and out from the bottom, avoiding the leakage phenomenon that may occur due to insufficient coaxiality of the external pipe connection in the conventional fuel top-in installation method, thereby ensuring that the engine will not affect the seal even under harsh working conditions such as continuous vibration.

[0055] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0056] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0057] It should also be noted that in this article, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device including the element.

[0058] The technical solutions provided by the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only for helping to understand the present invention, and the content of this specification should not be construed as a limitation to the present invention. At the same time, for those of ordinary skill in the art, according to the present invention, there will be various changes in the specific implementation manners and application scopes. It is not necessary and impossible to list all the implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A high-pressure differential methanol injector for a marine engine, characterized in that, Comprising: A gland, a solenoid valve assembly, a housing, a push rod, a spring, a stroke-limiting disc, a valve body, a valve core bushing, a spray hole plate and a valve seat; The gland, the housing and the valve core bushing are detachably connected from top to bottom and form a press-fitting cavity with an opening at the lower part; Inside the press-fitting cavity, the spray hole plate is arranged at the opening of the valve core bushing, the valve seat is arranged above the spray hole plate, the stroke-limiting disc is arranged above the valve seat, the spring is limited between the push rod and the stroke-limiting disc, the lower end of the push rod passes through the stroke-limiting disc and is connected to the valve body inside the valve seat, the upper end of the push rod is connected to the solenoid valve assembly, and a pressure accumulation cavity is formed between the valve body and the valve seat; A fuel inlet is arranged on the housing. After methanol fuel enters the housing from the fuel inlet, it then passes through the valve seat and enters the pressure accumulation cavity formed between the valve seat and the valve body; Under the combined action of the electromagnetic force provided by the solenoid valve assembly and the methanol supply pressure in the pressure accumulation cavity, the valve body moves together with the push rod, so that a gap is formed between the valve body and the valve seat, and the methanol fuel in the pressure accumulation cavity passes through the gap and sprays outwards from each spray hole of the spray hole plate.

2. The high-pressure differential methanol injector for a marine engine according to claim 1, characterized in that, The high-pressure difference methanol injector for a marine engine further comprises: A limit seat, which is arranged at the top end of the push rod, and the adjustment of the electromagnetic force of the solenoid valve assembly on the push rod is realized by adjusting the height of the limit seat.

3. The high-pressure differential methanol injector for a marine engine according to claim 1, wherein The solenoid valve assembly comprises: an armature, a solenoid valve and a yoke arranged in sequence from top to bottom; The upper end of the push rod passes through the yoke and the solenoid valve and is fixed to the armature.

4. The high-pressure differential methanol injector for a marine engine according to claim 3, wherein, A boss is arranged at the upper end of the armature, and there is a clearance fit between the outer circle and the inner hole of the boss; A plurality of balance holes are uniformly arranged along the axial direction between the upper and lower end faces of the armature.

5. The high-pressure differential methanol injector for a marine engine according to claim 3, characterized in that, The solenoid valve comprises: An explosion-proof plug, an electromagnetic coil, a skeleton, a stainless steel thin-walled sleeve and an iron core; The stainless steel thin-walled sleeve wraps the outer surface of the skeleton in direct contact with methanol fuel; The yoke is attached to the bottom end of the iron core.

6. The high-pressure differential methanol injector for a marine engine according to claim 1, characterized in that, An outer circle boss is arranged on the push rod, the spring is connected between the stroke-limiting disc and the outer circle boss, and the spring is sleeved on the push rod.

7. The high-pressure difference methanol injector for a marine engine according to claim 1, wherein A kidney-shaped diversion hole is arranged on the stroke-limiting disc, a circular diversion hole is arranged on the valve seat, and the circular diversion hole and the kidney-shaped diversion hole are coaxially arranged.

8. The high-pressure differential methanol injector for a marine engine according to claim 1, wherein The spray hole plate is an isometric thin plate with a thickness of 0.8 - 1.2 mm, and a plurality of micro-holes with a hole diameter of 0.6 - 0.8 mm are drilled on the spray hole plate; An included angle is left between each micro-hole during processing, and the included angle enables the methanol fuel to spray circumferentially and / or unidirectionally.

9. The high-pressure differential methanol injector for a marine engine according to claim 1, characterized in that, The lower end of the housing extends into the inside of the valve core bushing and is threadedly connected; The gland presses on the upper end of the housing and is threadedly connected to the housing through screws.

10. The high-pressure differential methanol injector for a marine engine according to claim 1, characterized in that, The sealing of the methanol fuel in the pressure accumulation cavity is realized by line contact between the valve body and the valve seat.

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