A marine methanol engine fuel injector with split valve core structure

Abstract

This patent relates to the field of methanol injector technology, specifically a marine methanol engine injector with a split valve core structure. It includes a solenoid valve assembly, a housing, a valve core assembly, a guide seat, a valve seat assembly, a limiting ring, and an elastic element. The valve core assembly includes a valve stem, a limit disc, a steel ball seat, a steel ball, and a connector. The bottom of the valve stem is detachably connected to the steel ball seat via the connector. The lower end face of the steel ball seat has an arc groove matching the steel ball. The steel ball is fixed below the steel ball seat and is located on the valve seat assembly. This solution fixes the steel ball to a separately designed steel ball seat as a single unit. The connector allows for detachable fixing of this unit to the valve stem, enabling direct replacement of the steel ball while retaining the original valve stem. This improves the utilization rate of the valve core assembly and solves the problem of existing integrated methanol injector structures requiring the valve stem to be replaced along with the steel ball, leading to a significant increase in maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of methanol injector technology, specifically a methanol injector for marine methanol engines with a split valve core structure. Background Technology

[0002] Currently, the automotive industry is gradually transitioning from combustion-driven systems to electric-driven systems. However, in the shipping industry, if electricity is used as a new energy drive system, its shortcomings in areas such as range make it difficult to replace ship propulsion systems in the short term. Therefore, carbon reduction and emission reduction solutions, represented by methanol fuel, have become the focus.

[0003] The valve stem and steel ball of existing methanol injectors are mostly designed as an integrated structure, in which the steel ball is fixed to the valve stem by welding. The disadvantage of this method is poor interchangeability. If the steel ball seal fails, the valve stem needs to be replaced as well, which leads to a significant increase in maintenance costs. In addition, the lift and air gap of the integrated structure design cannot be adjusted separately, which limits the power increase of the methanol injector. Summary of the Invention

[0004] The present invention aims to provide a marine methanol engine injector with a split valve core structure, in order to solve the problem that the existing integrated injector structure requires the valve stem to be replaced along with the steel ball when replacing the injector, which leads to a significant increase in maintenance costs.

[0005] To achieve the above objectives, the basic solution of the present invention is as follows: A marine methanol engine injector with a split valve core structure includes a solenoid valve assembly, a housing, a valve core assembly, a guide seat, a valve seat assembly, a limiting ring, and an elastic element. The guide seat and the limiting ring are installed inside the housing. The valve seat assembly is installed in the lower part of the housing. The bottom surface of the housing is provided with an flared opening. The valve core assembly is slidably connected inside the guide seat and the limiting ring, and the bottom of the valve core assembly abuts against the valve seat assembly. The solenoid valve assembly is installed above the housing, and the solenoid valve assembly is partially inserted into the housing and tightly presses against the limiting ring.

[0006] The valve core assembly includes a valve stem, a limit disc, a ball seat, a steel ball, and a connector. The top of the valve stem abuts against the solenoid valve assembly, and the elastic element is located between the valve stem and the solenoid valve assembly. The bottom of the valve stem is detachably connected to the ball seat via the connector. The limit disc is located between the guide seat and the limiting ring. The ball seat is vertically slidably connected within the guide sleeve. The limit disc is located at the upper end of the ball seat. The lower end face of the ball seat is provided with an arc groove that matches the steel ball. The steel ball is fixed below the ball seat and is located on the valve seat assembly.

[0007] The solenoid valve assembly and valve stem are vertically connected by a through hole in the middle. The valve stem sidewall is provided with several through holes that communicate with the middle of the valve stem. The limit plate and guide seat are provided with several corresponding through holes.

[0008] Furthermore, the solenoid valve assembly includes an iron core shell, an iron core, and a flight socket. The iron core shell is detachably connected to the housing. The iron core is installed inside the iron core shell. The flight socket is installed on the side of the iron core shell. The lower end of the iron core is provided with a mounting groove. The elastic element is installed in the mounting groove. The top of the valve stem is located in the mounting groove. The upper side of the valve stem is provided with a boss. The boss is located directly below the iron core. Both the iron core shell and the iron core have vertically connected through holes in the middle.

[0009] Furthermore, the valve seat assembly includes a valve seat and a nozzle plate. The nozzle plate is fixed to the bottom of the valve seat, the valve seat has a through hole in the middle, the steel ball is located above the through hole in the middle of the valve seat, and the nozzle plate has a plurality of nozzles.

[0010] Furthermore, it also includes two sealing rings, which are respectively fixed to the outside of the iron core and the outside of the valve seat.

[0011] Furthermore, the iron core shell is provided with a countersunk mounting hole on its side, and the housing is provided with a threaded hole on its side. The iron core shell is fixed to the housing by an internal hexagon screw.

[0012] Furthermore, the upper surface of the limiting disk is a beveled shape that is concave towards the center.

[0013] Furthermore, the upper surface of the valve seat is a beveled shape that is recessed towards the center.

[0014] The beneficial effects of this solution are: (1) This solution fixes the steel ball on a separately designed steel ball seat to form an integral part. The integral part is detachably fixed to the valve stem using a connector. Unlike ordinary integrated valve core assembly, this solution can directly replace the steel ball while retaining the original valve stem, thereby improving the utilization rate of the valve core assembly and having good interchangeability, reducing the processing and material costs of the valve stem assembly.

[0015] (2) This solution uses the limit plate and the steel ball seat to limit the distance between the steel ball and the valve seat. Unlike the integrated valve core structure where the lift and air gap are adjusted at the same time, this solution performs separate grinding of the limit plate and the steel ball seat for lift and air gap during the product assembly stage. By increasing the lift and adjusting the air gap, the injection flow of the alcohol injector can be increased, thus enabling it to adapt to engines with higher power and improving the adaptability of the alcohol injector. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the specific structure of the valve core assembly in an embodiment of the present invention;

[0018] Figure 3This is a schematic diagram of the specific structure of the steel ball seat in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the specific structure of the limit disk in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the specific structure of the valve seat assembly in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the specific structure of the guide seat in an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The reference numerals in the accompanying drawings include: iron core shell 101, iron core 102, socket 103, first O-ring seal 104, shell 2, second O-ring seal 201, valve stem 301, limit plate 302, steel ball seat 303, steel ball 304, internal hexagonal head screw 305, guide seat 4, valve seat 501, nozzle plate 502, limit ring 6, and return spring 7.

[0024] Example

[0025] The basics are as follows: Figure 1 As shown: A split-type valve core structure marine methanol engine injector includes a solenoid valve assembly, a housing 2, a valve core assembly, a guide seat 4, a valve seat 501 assembly, a limit ring 6, a return spring 7, and two O-rings. The guide seat 4 and the limit ring 6 are installed inside the housing 2. The valve seat 501 assembly is installed at the lower part of the housing 2. The bottom surface of the housing 2 is provided with an flared opening. The valve core assembly is slidably connected inside the guide seat 4 and the limit ring 6, and the bottom of the valve core assembly abuts against the valve seat 501 assembly. The solenoid valve assembly is installed above the housing 2, and the solenoid valve assembly is partially inserted into the housing 2 and presses tightly against the limit ring 6.

[0026] The solenoid valve assembly includes an iron core housing 101, an iron core 102, and a receptacle socket 103. The iron core housing 101 has six countersunk mounting holes on its side, and the housing 2 has six threaded holes on its side. The iron core housing 101 is fixed to the housing 2 by hexagon socket screws. The iron core 102 is installed inside the iron core housing 101, and the receptacle socket 103 is installed on the side of the iron core housing 101. The lower end of the iron core 102 has a mounting groove, and the return spring 7 is installed in the mounting groove.

[0027] Combination Figure 2As shown, the valve core assembly includes a valve stem 301, a limit disc 302, a ball seat 303, and a ball 304. The valve stem 301 is made of martensitic iron-silicon-chromium material and acts as an armature. The top of the valve stem 301 is located in the mounting groove, and a boss is provided on the upper side of the valve stem 301. The boss is located directly below the iron core 102. Figure 3 As shown, the ball seat 303 is convex in shape and has a threaded hole along the axial direction. The valve stem 301 is fixed to the ball seat 303 by an internal hexagon head screw 305. The limit plate 302 is located between the guide seat 4 and the limit ring 6. Figure 4 As shown, the upper surface of the limiting disc 302 is a beveled shape that is concave towards the center. The steel ball seat 303 is vertically slidably connected in the guide sleeve. The limiting disc 302 is located at the upper end of the steel ball seat 303. The lower surface of the steel ball seat 303 is provided with an arc groove that matches the steel ball 304. The steel ball 304 is welded to the lower part of the steel ball seat 303 and is located on the valve seat 501 assembly. The smaller the flatness and parallelism tolerances between the lower surface of the valve stem 301 and the upper surface of the steel ball seat 303, and between the lower surface of the limiting disc 302 and the upper surface of the steel ball seat 303, the more stable the consistency of the alcohol injector flow. During the alcohol injector assembly stage, depending on the engine power, the upper surface of the limiting disc 302 can be ground to the target lift first, and then the upper surface of the steel ball seat 303 can be ground to the target air gap.

[0028] Combination Figure 5 As shown, the valve seat 501 assembly includes a valve seat 501 and a nozzle plate 502. The upper surface of the valve seat 501 is a beveled shape that is recessed towards the center. The nozzle plate 502 is welded to the bottom of the valve seat 501. A through hole is provided in the middle of the valve seat 501. The edge of the through hole is provided with a sealing surface that matches the curvature of the steel ball 304. The steel ball 304 is located above the through hole in the middle of the valve seat 501. The sealing surface and the outer surface of the steel ball 304 are in line contact. The nozzle plate 502 is provided with several nozzles. The thickness of the nozzle plate 502 is generally 0.2 to 0.4 mm. The material is stainless steel containing martensite, which is convenient for adsorption onto the workpiece table of the grinding machine for grinding. The outer tangent circle diameter of all nozzles in the nozzle plate 502 is smaller than the inner diameter of the through hole on the valve seat 501. The diameter of the nozzle is generally 0.1 to 0.3 mm. The axis of the nozzle can form a certain angle with the axis of the nozzle plate 502 to improve the atomization effect.

[0029] The iron core shell 101, iron core 102 and valve stem 301 are vertically connected by through holes in the middle. The valve stem 301 has four through holes on its side wall that are connected to the middle of the valve stem 301. The limit plate 302 and guide seat 4 have several corresponding through holes. The methanol fuel flowing in through the valve stem 301 enters the cavity inside the guide seat 4 through the through holes. The cavity can play a role in pressure storage.

[0030] The lower end of the iron core 102 abuts against the upper end of the limiting ring 6, and the lower end of the limiting ring 6 abuts against the upper end of the limit plate 302. The lower end surface of the limit plate 302 abuts against the upper end surface of the guide seat 4 but does not contact the housing 2. Figure 6 The lower part of the guide seat 4 is stepped, and the inner end face of the guide seat 4 abuts against the valve seat 501 of the valve seat 501 assembly. The lower end face of the nozzle plate 502 of the valve seat 501 assembly abuts against the inner bottom surface of the housing 2. The two O-rings are the first O-ring 104 and the second O-ring 201. The first O-ring 104 is fixed between the outer side of the iron core 102 and the housing 2, and the second O-ring 201 is fixed between the outer side of the valve seat 501 and the housing 2, forming a sealing structure.

[0031] The specific implementation process is as follows: Methanol fuel is introduced through the top through hole of the iron core shell 101, flows through the iron core 102 and the valve stem 301 in sequence, and flows through the circumferential through hole of the valve stem 301 to the cavity inside the guide seat 4. Then it flows through the limit plate 302 and the through hole of the guide seat 4 in sequence, and enters the cavity in the upper part of the valve seat 501. After the solenoid valve assembly receives the electrical signal, the iron core 102 generates electromagnetic force to attract the protrusions around the valve stem 301, causing the valve stem 301 to lift upward, thereby driving the steel ball seat 303 and the steel ball 304 to lift. The methanol fuel is finally sprayed out through the nozzle through the through hole below the steel ball 304.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A marine methanol engine methanol injector with a split valve core structure, characterized in that: The device includes a solenoid valve assembly, a housing, a valve core assembly, a guide seat, a valve seat assembly, a limiting ring, and an elastic element. The guide seat and the limiting ring are installed inside the housing. The valve seat assembly is installed in the lower part of the housing. The bottom surface of the housing is provided with a flared opening. The valve core assembly is slidably connected inside the guide seat and the limiting ring, and the bottom of the valve core assembly abuts against the valve seat assembly. The solenoid valve assembly is installed above the housing, and the solenoid valve assembly is partially inserted into the housing and tightly presses against the limiting ring. The valve core assembly includes a valve stem, a limit disc, a ball seat, a steel ball, and a connector. The top of the valve stem abuts against the solenoid valve assembly, and the elastic element is located between the valve stem and the solenoid valve assembly. The bottom of the valve stem is detachably connected to the ball seat via the connector. The limit disc is located between the guide seat and the limiting ring. The ball seat is vertically slidably connected within the guide sleeve. The limit disc is located at the upper end of the ball seat. The lower end face of the ball seat is provided with an arc groove that matches the steel ball. The steel ball is fixed below the ball seat and is located on the valve seat assembly. The solenoid valve assembly and valve stem are vertically connected through holes in the middle, the valve stem sidewall is provided with several through holes connected to the middle of the valve stem, and the limit plate and guide seat are provided with several corresponding through holes. The solenoid valve assembly includes an iron core shell, an iron core, and an aero socket. The iron core shell is detachably connected to the housing. The iron core is installed inside the iron core shell. The aero socket is installed on the side of the iron core shell. The lower end of the iron core has a mounting groove. The elastic element is installed in the mounting groove. The top of the valve stem is located in the mounting groove. The upper side of the valve stem has a boss located directly below the iron core. Both the iron core shell and the iron core have vertically connected through holes in the middle. The lower end of the iron core abuts against the upper end of the limiting ring. The lower end of the limiting ring abuts against the upper end of the limiting plate. The lower end face of the limiting plate abuts against the upper end face of the guide seat but does not contact the housing. The valve seat assembly includes a valve seat and a nozzle plate. The nozzle plate is fixed to the bottom of the valve seat. The valve seat has a through hole in the middle. The steel ball is located above the through hole in the middle of the valve seat. The nozzle plate has a plurality of nozzle holes. The lower part of the guide seat is stepped. The inner end face of the guide seat abuts against the valve seat of the valve seat assembly. The lower end face of the nozzle plate of the valve seat assembly abuts against the inner bottom surface of the housing.

2. The marine methanol engine injector with a split valve core structure according to claim 1, characterized in that: It also includes two sealing rings, which are fixed to the outside of the iron core and the outside of the valve seat, respectively.

3. The marine methanol engine injector with a split valve core structure according to claim 2, characterized in that: The iron core shell has a countersunk mounting hole on its side and a threaded hole on its side. The iron core shell is fixed to the housing by an internal hexagon screw.

4. The marine methanol engine injector with a split valve core structure according to claim 3, characterized in that: The upper surface of the limiting plate is a beveled shape that is concave towards the center.

5. A marine methanol engine injector with a split valve core structure according to claim 4, characterized in that: The upper surface of the valve seat is beveled and recessed towards the center.

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