A balanced gas injection valve for marine gas engines

Abstract

The present invention specifically discloses a balanced gas injection valve for a marine gas engine, comprising a solenoid valve, a valve housing, and a valve core assembly; the valve core assembly comprises an armature, a moving sealing diaphragm, an O-ring, a travel limiter, a return spring, a valve disc, a hexagon socket head screw, a limiter ring, a T-shaped pressure cylinder, and a valve seat; through holes 1, 2, and 3 are respectively provided at the center axes of the three parts, namely, the armature, the hexagon socket head screw, and the valve seat, and the through holes 1, 2, and 3 connect the core cavity with the back pressure point. When the gas injection valve is opened and closed, the two ambient gases in the core cavity and the back pressure point can flow smoothly and maintain the consistency of the gas pressure, thereby reducing the valve disc opening resistance and increasing the working pressure difference, thereby achieving a power increase for the engine under the same model of gas injection valve; the metal-non-metal contact seal adopted between the valve disc and the valve seat can achieve minimal or even zero leakage, and can be adapted to new energy fuel injection systems such as hydrogen.

Description

Technical Field

[0001] The invention belongs to the technical field of gas injection valves, and in particular relates to a balanced gas injection valve for a marine gas engine. Background Art

[0002] The fuel and energy transformation in the shipping industry is imminent, and the power system technology upgrade is urgently needed. New energy fuels such as LNG, ammonia, and hydrogen are being promoted for use. This puts higher demands on the core component of the gas engine - the gas injection valve.

[0003] Most existing gas injection valves adopt an air pressure unbalanced structure, which has certain limitations in terms of efficiency and adaptability, mainly including: (1) Due to the pressure difference between the air pressure at the core cavity and the back pressure at the air pressure unbalanced structure when the valve is opened and closed, the opening resistance increases, and the engine power (working pressure difference) is limited; (2) The valve plate and valve seat of conventional gas injection valves adopt a metal-metal contact sealing type, and most of them are used to inject LNG fuel (methane). This method inevitably causes leakage, resulting in methane escape. The environmental pollution hazard of methane is greater than that of carbon dioxide, which cannot achieve the purpose of the emission reduction strategy, and the adaptability range of the gas injection valve is also limited.

[0004] Therefore, it is very necessary to optimize and upgrade the existing gas injection valve structure to achieve power improvement of the gas engine and improve the fuel adaptability of the gas injection valve. Summary of the Invention

[0005] The purpose of the present invention is to provide a balanced gas injection valve for marine gas engines to solve the problem that in existing gas injection valves, there is a pressure difference between the iron core cavity and the back pressure point when the valve is opened and closed, which leads to increased opening resistance and limited increase in engine power (operating pressure difference).

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A balanced gas injection valve for a marine gas engine comprises a solenoid valve, a valve housing and a valve core assembly; the solenoid valve and the valve core assembly are both installed in the valve housing, and the valve core assembly is located below the solenoid valve;

[0008] The valve core assembly includes an armature, a moving sealing diaphragm, an O-ring, a travel limiter, a return spring, a valve disc, a hexagon socket head screw, a limit ring, a T-shaped pressure cylinder and a valve seat;

[0009] The T-shaped pressure cylinder is sleeved outside the armature, and the lower end surface of the T-shaped pressure cylinder is lower than the lower end surface of the armature. The lower end surface of the T-shaped pressure cylinder contacts the valve disc. The limit disk is located between the armature and the valve disc. The inner circular end of the moving sealing diaphragm is clamped between the armature and the T-shaped pressure cylinder, and the outer circular end is clamped between the limit disk and the limiting ring. A return spring is provided between the limit disk and the valve disc. The hexagonal cylindrical head screw passes through the center hole of the valve disc and is screwed into the threaded hole of the armature to fasten the T-shaped pressure cylinder, the moving sealing diaphragm and the armature, and fix the valve disc on the armature.

[0010] The lower end surface of the valve disc is provided with a circular belt 1, and an air inlet hole is provided in the valve disc column from the outer side of the circumference to the center of the circle, and the air inlet hole passes through the circular belt 1. The valve disc is provided with a valve seat below, and the upper end surface of the valve seat is provided with a circular belt 2 that matches the circular belt 1 of the valve disc. When the gas injection valve is closed, the circular belt 1 and the circular belt 2 cross and overlap and adhere to each other;

[0011] The upper end surface of the limit ring is higher than the upper end surface of the limit disk and the upper end surface of the armature, and the lower end surface of the solenoid valve is pressed against the upper end surface of the limit ring. The limit ring, the moving sealing diaphragm, the limit disk and the valve seat are pressed against the step in the valve housing by the solenoid valve. The solenoid valve, the limit ring and the armature surround to form an iron core cavity, and the lower end of the valve seat and the valve housing form a back pressure point;

[0012] The armature is provided with a through hole 1 along the central axis, the hexagon socket head screw is provided with a through hole 2 along the central axis, the valve seat is provided with a through hole 3 along the central axis, and the core cavity is connected to the back pressure point through the through hole 1, the through hole 2 and the through hole 3;

[0013] When the solenoid valve is opened, the armature moves upward under the action of the solenoid valve, and the valve disc is lifted up through the hexagonal cylindrical head screw to open the gas injection valve; when the solenoid valve is closed, the return spring rebounds the valve disc and presses it tightly against the upper end face of the valve seat to close the gas injection valve.

[0014] Furthermore, a circular groove is provided in the middle of the second circular belt, and a layer of plastic film is coated on the circular groove.

[0015] Furthermore, a circular groove is provided at the center of the upper end of the valve plate, and the lower end surface of the T-shaped pressure cylinder contacts the circular groove of the valve plate.

[0016] Furthermore, the vertical cross-section of the limit disk is "H"-shaped, with steps one and two at the upper end, and a groove for installing an O-ring one on the outer wall. The groove is close to the upper end of the limit disk, and the O-ring one is located between the valve housing and the limit disk.

[0017] Furthermore, three process holes are provided on the upper end of the armature.

[0018] Furthermore, the valve housing features three evenly spaced air inlets at its waist and an air outlet at its lower end. Two layers of wire mesh are installed on the valve housing, outside the air inlets. The outer wire mesh has fine wire diameter and small mesh openings, while the inner wire mesh has coarse wire diameter and large mesh openings. This structure ensures excellent support for high-speed airflow filtration, with the outer wire mesh providing filtering and the inner wire mesh providing support.

[0019] Furthermore, an O-ring 2 is provided between the valve seat and the valve housing.

[0020] Furthermore, an O-ring three is provided on the outer wall of the valve housing.

[0021] Furthermore, an O-ring four is provided between the solenoid valve and the valve housing.

[0022] The beneficial effects of the present invention are:

[0023] 1. When the gas injection valve is opened and closed, the two ambient gases in the core cavity and the back pressure area can flow smoothly and maintain the consistency of gas pressure, reducing the valve opening resistance and increasing the working pressure difference (which can increase the opening pressure), thereby achieving a power improvement for the engine under the same type of gas injection valve.

[0024] 2. A special plastic film is coated on the upper end of the valve seat groove. This high-density coating is free of pores and defects. This structure achieves a metal-to-nonmetal contact seal between the valve disc and the valve seat. This method offers excellent sealing and high reliability, and can achieve minimal or even zero leakage when the valve is closed. It is compatible with new energy fuel injection systems such as methanol, ammonia, and hydrogen.

[0025] 3. Through holes 1, 2, and 3 are respectively provided at the center axes of the armature, hexagon socket head screw, and valve seat. These holes connect the core cavity with the back pressure point. This structure ensures consistent pressure between the core cavity and the back pressure point, resulting in a simple structure and easy process implementation.

[0026] 4. Two layers of wire mesh are installed on the valve housing, outside the air inlet. The inner layer has coarse wires and large mesh openings, while the outer layer has fine wires and small mesh openings. This structure provides excellent support for high-speed airflow filtration, with the outer layer providing filtering and the inner layer providing support. Furthermore, these two layers of wire mesh clean and filter the fuel gas, effectively reducing the risk of gas injection valve sticking and leaking, and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1The present invention is a cross-sectional view of a balanced gas injection valve for a marine gas engine.

[0028] Figure 2 The present invention is a schematic diagram of the air guide hole of the valve core assembly of a balanced gas injection valve for a marine gas engine.

[0029] Figure 3 The present invention is a schematic diagram of the valve plate structure of a balanced fuel gas injection valve for a marine gas engine.

[0030] Figure 4 The present invention is a schematic diagram of the valve seat structure of a balanced fuel gas injection valve for a marine gas engine.

[0031] Figure 5 The present invention is a schematic structural diagram of a travel limiter disc of a balanced fuel gas injection valve for a marine gas engine. DETAILED DESCRIPTION

[0032] The following is further described in detail through specific implementation methods:

[0033] The figure marks in the drawings of the specification include: 1. solenoid valve; 2. valve housing; 21. air inlet; 22. air outlet; 23. two-layer wire filter; 3. valve core assembly; 31. armature; 311. through hole one; 32. moving sealing diaphragm; 33. O-ring one; 34. limit plate; 341. step one; 342. step two; 343. groove; 35. return spring; 36. valve plate; 361. air inlet; 362. circular groove; 37. hexagon socket head screw; 371. through hole two; 38. limiting ring; 39. T-shaped pressure cylinder; 4. valve seat; 41. circular groove; 42. through hole three; 5. O-ring two; 6. O-ring three; 7. O-ring four; 8. core cavity; 9. back pressure point.

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] As attached Figure 1 As shown: A balanced gas injection valve for a marine gas engine includes a solenoid valve 1, a valve housing 2 and a valve core assembly 3; the solenoid valve 1 and the valve core assembly 3 are both installed in the valve housing 2, and the valve core assembly 3 is located below the solenoid valve 1.

[0036] As attached Figure 1As shown, the valve housing 2 is cylindrical in shape, with a threaded hole on its upper end for securing the solenoid valve 1. The solenoid valve 1 is mounted on the valve housing 2 using a plug-in mounting system. Three evenly spaced air inlets 21 are located at the waist of the valve housing 2, and an air outlet 22 is located at the lower end. Two layers of wire mesh 23 are welded to the valve housing 2, located outside the air inlets 21. The two layers of wire mesh 23 are welded to the valve housing 2. The inner layer of wire mesh has coarse wires and a large mesh size, while the outer layer has fine wires and a small mesh size. The inner layer of wire mesh supports the outer layer of wire mesh, filtering the fuel gas. Specifically, three steps are located on the valve housing 2, located outside the air inlet 21. The two layers of wire mesh 23 are welded to the middle step of the valve housing 2. This structure supports the double-layered filter, preventing it from collapsing under high-speed airflow conditions.

[0037] As attached Figure 1 and attached Figure 2 As shown: the valve core assembly 3 includes an armature 31, a moving sealing diaphragm 32, an O-ring 33, a travel limiter 34, a return spring 35, a valve disc 36, a hexagon socket head screw 37, a limiting ring 38, a T-shaped pressure cylinder 39 and a valve seat 4.

[0038] As attached Figure 1-3 As shown, the T-shaped pressure cylinder 39 is positioned over the armature 31, with its lower end lower than the lower end of the armature 31. It contacts the circular groove 362 of the valve disc 36. The limiter plate 34 is located between the armature 31 and the valve disc 36. The inner end of the movable sealing diaphragm 32 is clamped between the armature 31 and the T-shaped pressure cylinder 39, while its outer end is clamped between the limiter plate 34 and the limiting ring 38. The movable sealing diaphragm 32 has an Ω-shaped cross-section. Return springs 35 are evenly distributed between the limiter plate 34 and the valve disc 36. Hexagon socket head cap screws 37 pass through the center hole of the valve disc 36 and screw into the threaded holes of the armature 31, securing the T-shaped pressure cylinder 39, the movable sealing diaphragm 32, and the armature 31, thereby securing the valve disc 36 to the armature 31. The lower end surface of the T-shaped pressure cylinder 39 is lower than the lower end surface of the armature 31. Its function is to clamp the moving sealing diaphragm 32 through the gap between the lower end of the T-shaped pressure cylinder 39 and the lower end of the armature 31 when the hexagon socket head screw 37 is screwed into the armature 31.

[0039] As attached Figure 1 , Attachment Figure 2 and attached Figure 5As shown, the vertical cross-section of the limiter disc 34 is H-shaped, with steps 1 341 and 2 342 provided at its upper end. The raised end of the moving sealing diaphragm 32 lies flat between steps 1 341 and 2 342 of the limiter disc 34. The provision of steps 1 341 and 2 342, in conjunction with the moving sealing diaphragm 32, improves the fit between the moving sealing diaphragm 32 and the limiter disc 34. The limiter ring 38 presses against the upper end of the moving sealing diaphragm 32, providing a flexible compression mechanism between the limiter ring 38 and the limiter disc 34 via the moving sealing diaphragm 32. The limiter disc 34 provides support between the limiter ring and the valve seat. A groove 343 for mounting the O-ring 1 33 is formed on the outer wall of the limiter disc 34. Groove 343 is located near the upper end of the limiter disc 34. The O-ring 1 33 is located between the valve housing 2 and the limiter disc 34. The O-ring 33 used between the limit disc 34 and the valve housing 2 is sealed by gas sealing, which ensures that gas will not flow into the iron core cavity 8 through the gap between the limit disc 34 and the valve housing 2 and the gap between the limit disc 34 and the armature 31.

[0040] As attached Figure 1-3 As shown, a circular groove 362 is provided at the center of the upper end of the valve disc 36. The diameter of the groove 362 is slightly larger than the outer diameter of the lower end of the armature 31. This allows the hexagon socket head screw 37 to be screwed into the armature 31 more deeply without changing its length, thereby maximizing the tightness and connection strength between the valve disc 36 and the armature 31. A circular band 1 is provided on the lower end surface of the valve disc 36. Each of the six uprights of the valve disc 36 is provided with an air inlet hole 361 extending from the outer circumference toward the center. The air inlet holes 361 extend through the circular band 1. The air inlet holes 361 are not drilled through the circular groove 362 at the lower end of the valve disc 36, but rather drilled outside the circular groove 362 at the lower end of the valve disc 36. This structure prevents air from flowing from the valve disc 36 into through-hole 1 311, through-hole 2 371, and through-hole 3 42, while increasing the flow area of ​​the gas injection valve.

[0041] As attached Figure 1 , Attachment Figure 2 and attached Figure 4 As shown, below the valve disc 36 is the valve seat 4. The upper end surface of the valve seat 4 is provided with a second annular band, which mates with the first annular band of the valve disc 36. A circular groove 41 is located in the center of the second annular band, which has a concave cross-section. The annular groove 41 is coated with a dense plastic film, free of pores and defects. When the gas injection valve is closed, the first and second annular bands overlap and fit tightly against each other. When the gas injection valve is open, a gap remains between the valve disc 36 and the valve seat 4. By coating the groove 41 with a special plastic film, a metal-to-nonmetal contact seal is achieved between the valve disc 36 and the valve seat 4. This seal provides excellent sealing performance and high reliability. When the gas injection valve is closed, it can achieve minimal or even zero leakage, making it suitable for use in fuel systems with small molecule gases such as methanol, ammonia, and hydrogen.

[0042] As attached Figure 1 , Attachment Figure 2 As shown: the upper end surface of the limit ring 38 is higher than the upper end surface of the limit disk 34 and the upper end surface of the armature 31, the lower end surface of the solenoid valve 1 is pressed tightly against the upper end surface of the limit ring 38, the limit ring 38, the moving sealing diaphragm 32, the limit disk 34 and the valve seat 4 are pressed tightly against the step inside the valve housing 2 by the solenoid valve 1, the solenoid valve 1, the limit ring 38 and the armature 31 surround to form an iron core cavity 8, and the lower end of the valve seat 4 and the valve housing 2 form a back pressure point 9. The armature 31 is provided with a through hole 1 311 along the center axis, the hexagon socket cylindrical head screw 37 is provided with a through hole 2 371 along the center axis, and the valve seat 4 is provided with a through hole 3 42 along the center axis. The iron core cavity 8 is connected with the back pressure point 9 through the through hole 1 311, the through hole 2 371 and the through hole 3 42; when the solenoid valve 1 is opened, the armature 31 moves upward under the action of the solenoid valve 1, and drives the valve disc 36 to lift up through the hexagon socket cylindrical head screw 37, thereby opening the gas injection valve; when the solenoid valve 1 is closed, the return spring 35 rebounds the valve disc 36 and presses it tightly against the upper end face of the valve seat 4, thereby closing the gas injection valve.

[0043] Specifically, the moving sealing diaphragm 32 and O-ring 1 33 prevent the inlet gas from passing through the core cavity 8. An O-ring 2 5 is positioned between the valve seat 4 and the valve housing 2. An O-ring 3 6 is positioned on the outer wall of the valve housing 2. An O-ring 4 7 is positioned between the solenoid valve 1 and the valve housing 2.

[0044] The upper end of the armature 31 is provided with three process holes, and the tooling with cylindrical pins is inserted into the process holes. With the above structure, only a tooling and a bench vise are needed to tighten the hexagon socket head screws 37 into the threaded holes of the armature 31.

[0045] The valve core assembly 3, installed within the valve housing 2, isolates the air exchange between the air inlet and the core cavity 8, creating two independent air pressure environments. Furthermore, through-hole 1 311, through-hole 2 371, and through-hole 3 42 are respectively provided at the center axes of the armature 31, the hexagon socket head screw 37, and the valve seat 4. These through-holes 1 311, 371, and 42 connect the core cavity 8 with the back pressure point 9, ensuring consistent air pressure between the core cavity 8 and the back pressure point 9. This reduces the opening resistance of the gas injection valve and increases the operating pressure differential, thereby boosting engine power.

[0046] The moving sealing diaphragm 32 is mounted between the limiting ring 38, the armature 31, and the travel limit disc 34. It is clamped securely between the disc at the top of the armature 31. When the valve disc 36 moves upward, the armature 31, integral with the valve disc 36, moves upward. The "Ω"-shaped structure of the moving sealing diaphragm 32 deforms slightly along with the armature 31. This structure isolates and seals the airflow between the air inlet and the core cavity 8, and prevents air from flowing into the core cavity 8 as the armature moves upward.

[0047] The matching surface of the valve seat 4 is provided with a circular groove 41 on the circular ring band, and the circular groove 41 is coated with a layer of plastic film. The plastic coating has a high density and no pores or defects. The valve plate 36 rebounds under the action of the return spring 35 and fits tightly against the matching surface of the valve seat 4. At this time, the valve is closed, and the gas at the air inlet cannot reach the back pressure environment 9, achieving trace leakage or even zero leakage.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A balanced gas injection valve for a marine gas engine, characterized by: It includes a solenoid valve, a valve housing and a valve core assembly; the solenoid valve and the valve core assembly are both installed in the valve housing, and the valve core assembly is located below the solenoid valve; The valve core assembly includes an armature, a moving sealing diaphragm, an O-ring, a travel limiter, a return spring, a valve disc, a hexagon socket head screw, a limit ring, a T-shaped pressure cylinder and a valve seat; The T-shaped pressure cylinder is sleeved outside the armature and the lower end surface of the T-shaped pressure cylinder is lower than the lower end surface of the armature. The lower end surface of the T-shaped pressure cylinder contacts the valve disc. The limit disk is located between the armature and the valve disc. The inner circular end of the moving sealing diaphragm is clamped between the armature and the T-shaped pressure cylinder, and the outer circular end is clamped between the limit disk and the limiting ring. A return spring is provided between the limit disk and the valve disc. The hexagonal cylindrical head screw passes through the center hole of the valve disc and is screwed into the threaded hole of the armature to fasten the T-shaped pressure cylinder, the moving sealing diaphragm and the armature, and fix the valve disc on the armature. The lower end surface of the valve disc is provided with a circular belt 1, and an air inlet hole pointing from the outer side of the circumference to the center of the circle is provided in the valve disc column, the air inlet hole passes through the circular belt 1, the lower side of the valve disc is a valve seat, the upper end surface of the valve seat is provided with a circular belt 2 that matches the circular belt 1 of the valve disc, when the gas injection valve is closed, the circular belt 1 and the circular belt 2 cross and overlap and adhere to each other, a circular groove is provided in the middle of the circular belt 2, and a layer of plastic film is coated on the circular groove, a circular groove is provided in the center of the upper end of the valve disc, and the lower end surface of the T-shaped pressure cylinder contacts the circular groove of the valve disc; The upper end surface of the limit ring is higher than the upper end surface of the limit disk and the upper end surface of the armature, and the lower end surface of the solenoid valve is pressed against the upper end surface of the limit ring. The limit ring, the moving sealing diaphragm, the limit disk and the valve seat are pressed against the step in the valve housing by the solenoid valve. The solenoid valve, the limit ring and the armature surround to form an iron core cavity, and the lower end of the valve seat and the valve housing form a back pressure point; The armature is provided with a through hole 1 along the central axis, the hexagon socket head screw is provided with a through hole 2 along the central axis, the valve seat is provided with a through hole 3 along the central axis, and the core cavity is connected to the back pressure point through the through hole 1, the through hole 2 and the through hole 3; The vertical cross-section of the limit disc is H-shaped, with steps 1 and 2 provided at the upper end. A groove for mounting an O-ring 1 is provided on the outer wall. The groove is close to the upper end of the limit disc. The O-ring 1 is located between the valve housing and the limit disc. The waist of the valve housing is provided with three evenly distributed air inlets, the lower end of the valve housing is provided with an air outlet, and two layers of metal wire filters are provided on the valve housing and outside the air inlets; When the solenoid valve is opened, the armature moves upward under the action of the solenoid valve, and the valve disc is lifted up through the hexagonal cylindrical head screw to open the gas injection valve; when the solenoid valve is closed, the return spring rebounds the valve disc and presses it tightly against the upper end face of the valve seat to close the gas injection valve.

2. A balanced gas injection valve for a marine gas engine according to claim 1, characterized in that: The upper end of the armature is provided with three process holes.

3. A balanced gas injection valve for a marine gas engine according to claim 1, characterized in that: An O-type sealing ring 2 is provided between the valve seat and the valve housing.

4. A balanced gas injection valve for a marine gas engine according to claim 1, characterized in that: An O-type sealing ring three is provided on the outer wall of the valve housing.

5. A balanced gas injection valve for a marine gas engine according to claim 1, characterized in that: An O-ring four is provided between the solenoid valve and the valve housing.

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