An adjustable flow gas injection valve

Abstract

The present application relates to the technical field of fuel injection components for dual-fuel and gas engines, and particularly relates to an adjustable flow gas injection valve; comprising a gland, a solenoid valve assembly, a valve housing, a limiting block, a valve sheet, a valve seat, a locking retainer, an internal hexagonal cylindrical head screw, an armature, an O-shaped sealing ring, a return spring, an elastic retainer and a wire welded filter screen. The present application adjusts the lift by rotating the valve seat after the valve seat is installed in the valve housing, and after the lift is determined, the valve seat is locked again by the locking retainer to improve the connection strength of the valve housing and the valve seat. In addition, the valve housing and the valve seat are respectively engraved with scale lines and pointer lines, and the lift value can be read on site while rotating the valve seat, so that the flexible adjustment of the injection flow of the gas injection valve is realized in the production and assembly stage, so that the injection flow of the valves in the same batch is kept highly consistent, the power performance of the engine is improved, and the structure is simple, easy to realize and high in adjustment precision.

Description

Technical Field

[0001] This invention relates to the field of fuel injection components for marine dual-fuel and gas engines, and particularly to an adjustable flow gas injection valve. Background Technology

[0002] Currently, dual-fuel and gas engines (hereinafter referred to as engines) are increasingly being used in the marine industry due to their low emissions, high efficiency, and safety and reliability. As a key component of the engine, one of the parameters of the gas injection valve is the injection flow rate, which directly affects the engine's power and performance.

[0003] During the production and assembly stage of existing gas injection valves, the lift (within a unit filament) needs to be determined based on the injection flow rate and then milled. This stage is easily affected by factors such as the operator's skill level and the quality of the machinery and equipment, which can easily lead to excessive milling and assembly errors, resulting in the scrapping of related components of the gas injection valve. In addition, because there are qualitative differences between the milled parts, and these differences are irreversible, it is difficult to guarantee the consistency of the injection flow rate of the same batch of gas injection valves used in a single engine.

[0004] To address this, an adjustable flow gas injection valve is proposed as a technical improvement to existing gas injection valves, enabling flexible adjustment of injection flow during the production and assembly phase while maintaining high consistency, thereby improving engine power and performance. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable flow gas injection valve, which achieves adjustable injection flow by adjusting the lift between the valve plate and the valve seat, aiming to maintain a high degree of consistency in the injection flow of gas injection valves of the same batch used in a single engine.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] An adjustable flow gas injection valve includes a gas injection valve body, a gland, a solenoid valve assembly, a valve housing, a limit block, a valve plate, a valve seat, a locking ring, an internal hexagonal head screw, an armature, an O-ring, a return spring, an elastic retaining ring, and a wire welded filter assembly.

[0008] Specifically, the valve body and the valve seat are threaded together, and the lift is adjusted by screwing the valve seat in or out, which is used to adjust the flow of the gas injection valve body during the production and assembly stage. The locking ring is located below the valve seat and is threaded together with the valve body. By rotating the locking ring until it abuts against the lower end face of the valve seat, it is used to perform secondary locking of the valve seat.

[0009] Specifically, the valve housing has an axial flow pipe structure, the valve housing outlet is provided with an internal thread, the lower end face of the internal thread is provided with a cylindrical surface, and the cylindrical surface is provided with scale lines, which are evenly distributed along the circumference of the cylindrical surface.

[0010] Specifically, the gas injection valve body also includes an O-ring seal. An O-ring seal groove is provided on the inner side wall of the valve body, and the O-ring seal groove is located above the end point of the internal thread of the valve body. The O-ring seal is installed in the O-ring seal groove and is located between the inner end face of the valve seat and the end point of the internal thread of the valve body.

[0011] Specifically, the valve seat has an external thread in the circumferential direction on its outer side, which is adapted to the internal thread of the valve body. The valve seat has an internal hexagonal cylindrical hole at the center of its outer end face, and the valve seat also has a pointer line on its outer end face, which is used in conjunction with the scale line.

[0012] Specifically, the pointer line consists of five pointer lines spaced 1° apart.

[0013] Specifically, the outer side of the locking retaining ring is provided with a cylindrical surface and an external thread in the circumferential direction from top to bottom. The tooth profile angle, major diameter, and minor diameter of the external thread of the locking retaining ring correspond one-to-one with the tooth profile angle, major diameter, and minor diameter of the external thread of the valve seat. The outer diameter of the cylindrical surface of the locking retaining ring is smaller than the minor diameter of the external thread of the locking retaining ring. The inner diameter of the cylindrical surface of the locking retaining ring is equal to the outer diameter of the valve seat outlet. The locking retaining ring has two tooling thread through holes with a 180° included angle.

[0014] Specifically, a valve plate is provided at the upper end of the valve seat, and a limiting block and an armature are provided at the upper end of the valve plate. The limiting block is located outside the armature. The armature and the valve plate are fixedly connected by hexagonal head screws. Six return springs are fixed between the valve plate and the limiting block. After the valve seat is rotated to contact the valve plate, the valve seat is rotated further until it can no longer be rotated, so that the valve plate is pressed against the limiting block, which is used to achieve zero lift. A solenoid valve assembly is provided at the upper end of the limiting block, and a pressure cap is provided at the upper end of the solenoid valve assembly. The pressure cap is fixedly connected to the valve body by screws. The pressure cap is used for... The solenoid valve assembly and the limiting block are pressed together. The terminal block is fixed to the side of the valve body. The solenoid valve assembly and the terminal block are electrically connected. The armature is matched with the solenoid valve assembly. When the terminal block powers the solenoid valve assembly, the armature is attracted upwards by the magnetic force, which drives the valve plate to move upwards. At this time, the gas injection valve opens and gas flows out. When the terminal block de-energizes the solenoid valve assembly, the armature loses its magnetic force and drives the valve plate to move downwards until it returns to its original position under the action of the return spring. The valve plate and the valve seat are tightly fitted under the action of the return spring. At this time, the gas injection valve closes and the gas injection ends.

[0015] Specifically, the pressure cap has an annular groove, the metal wire welded filter assembly is installed in the annular groove, the elastic retaining ring abuts against the upper end of the metal wire welded filter assembly, and the elastic retaining ring is locked between the annular groove and the metal wire welded filter assembly.

[0016] Specifically, the metal wire welded filter assembly adopts a double-layer metal wire filter structure, including an inner filter and an outer filter. The diameter of the metal wires in the inner filter is larger than that in the outer filter, and the pore size of the inner filter is larger than that of the outer filter. The inner filter serves as a support, while the outer filter serves as a filter.

[0017] The beneficial effects of this invention are as follows:

[0018] (1) The present invention relates to an adjustable flow gas injection valve, which improves the existing gas injection valve by using the threaded connection between the valve body and the valve seat to adjust the lift between the valve plate and the valve seat, thereby realizing flexible adjustment of the flow rate of the gas injection valve during the production and assembly stage; at the same time, by setting the scale line and the pointer line, the lift adjustment value can be obtained, which has good on-site readability and can keep the injection flow rate of the same batch of gas injection valves highly consistent.

[0019] (2) The present invention relates to an adjustable flow gas injection valve, which can achieve two-stage locking of the valve seat by setting a locking ring. Without affecting the fuel injection quantity of the gas injection valve, the connection strength between the valve body and the valve seat can be improved. The structure is simple, easy to implement and has high reliability. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of an adjustable flow gas injection valve assembly according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the valve seat according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram illustrating the valve seat lift adjustment principle according to an embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view of the locking retaining ring according to an embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional view of the valve housing according to an embodiment of the present invention;

[0025] Figure 6 This is an assembly diagram of the valve body, valve seat, and locking ring according to an embodiment of the present invention.

[0026] Reference numerals: 1. Pressure cap; 2. Solenoid valve assembly; 3. Valve body; 31. Internal thread of valve body; 32. Cylindrical surface of valve body; 33. Scale line; 4. Limit block; 5. Valve plate; 6. Valve seat; 61. External thread of valve seat; 62. Internal hexagonal cylindrical hole of valve seat; 63. Pointer line; 7. Locking retaining ring; 71. External thread of locking retaining ring; 72. Cylindrical surface of locking retaining ring; 73. Tooling threaded through hole; 8. Internal hexagonal head screw; 9. Armature; 10. O-ring seal; 11. Return spring; 12. Elastic retaining ring; 13. Metal wire welded filter assembly. Detailed Implementation

[0027] 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 a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Reference Appendix Figure 1 An adjustable flow gas injection valve includes a gas injection valve body, comprising a pressure cap 1, a solenoid valve assembly 2, a valve housing 3, a limit block 4, a valve plate 5, a valve seat 6, a locking retaining ring 7, an internal hexagonal head screw 8, an armature 9, an O-ring seal 10, a return spring 11, an elastic retaining ring 12, and a metal wire welded filter assembly 13.

[0029] In one embodiment, the valve body 3 and the valve seat 6 are threaded together. The lift is adjusted by screwing the valve seat 6 in or out, which is used to adjust the flow of the gas injection valve body during the production and assembly stage. The locking ring 7 is located below the valve seat 6 and is threaded together with the valve body 3. The locking ring 7 is rotated until it abuts against the lower end face of the valve seat 6, which is used to lock the valve seat 6 in two stages.

[0030] Furthermore, the valve seat 6 is installed inside the valve body 3, and the lift between the valve seat 6 and the valve plate 5 is adjusted by means of a threaded connection. There are scale lines 33 at the outlet of the valve body 3, and pointer lines 63 are engraved on the outer end face of the valve seat 6. The lift adjustment accuracy can be achieved by changing the interval angle of the scale lines 33 at the outlet of the valve body 3. In addition, the valve seat 6 can be locked in two stages by the locking retaining ring 7. In this embodiment, the adjustment accuracy is 0.01mm and the adjustment lift range is 1mm. The lift can be changed during the production and assembly stage to realize the adjustment of fuel gas flow, thereby improving the consistency of the injection flow of the same batch of gas injection valves used in a single engine.

[0031] Furthermore, the external thread 61 of the valve seat is tightly fitted with the internal thread 31 of the valve body. With the above structure, a hex wrench can be inserted into the internal hexagonal cylindrical hole to rotate the valve seat 6, changing the distance between the valve seat 6 and the valve plate 5. Without external testing equipment, the lift of the gas injection valve can be adjusted with just a hex wrench. The structure is simple and highly accurate.

[0032] Furthermore, the valve body internal thread 31 is designed to be compatible with the valve seat external thread 61. The lead and tooth angle of the valve seat external thread 61 can be determined according to the operating conditions and material strength. With the above structure, the lift can be flexibly adjusted during the production and assembly stage, so that the injection flow of the gas injection valves in the same batch has good consistency.

[0033] In one embodiment, reference is made to the appendix. Figure 2 , 3 5. The valve body 3 has an axial flow pipe structure. The valve body 3 has an internal thread 31 at the air outlet. The lower end face of the internal thread 31 has a cylindrical surface 32. The cylindrical surface 32 has scale lines 33, which are evenly distributed along the circumference of the cylindrical surface 32. The inner side wall of the valve body 3 has an O-ring 10 groove, which is located above the end point of the internal thread 31. The O-ring 10 is installed in the groove and is located between the inner end face of the valve seat 6 and the end point of the internal thread 31. The outer side of the valve seat 6 has an external thread 61 in the circumferential direction. The external thread 61 is adapted to the internal thread 31. The center of the outer end face of the valve seat 6 has an internal hexagonal cylindrical hole. The outer end face of the valve seat 6 also has a pointer line 63, which works in conjunction with the scale line 33.

[0034] Furthermore, the position of the valve body internal thread 31 is lower than the groove of the O-ring seal 10. The lower end face of the valve body internal thread 31 is provided with a valve body cylindrical surface 32. The valve body cylindrical surface 32 is provided with scale lines 33, which are evenly distributed along the circumference of the valve body cylindrical surface 32. With the above structure, the scale is marked inside the valve body 3 for on-site reading. The scale lines 33 are laser engraved, which has high reading accuracy. In addition, the lift follows the formula: lift = number of scales × adjustment accuracy.

[0035] Furthermore, the pointer line 63 includes five pointer lines 63 spaced 1° apart, and the scale line 33 is a scale line 33 divided into seventy-two parts (the interval between the scale lines 33 is 5°). The structure of pointer line 63 and scale line 33 has the advantages of structural feasibility and simple process, and can realize on-site readability of gas injection valve flow regulation without the need for an external meter. In addition, setting five pointer lines 63 spaced 1° apart on the outer end face of valve seat 6 makes it easier to find the scale line 33 directly opposite the valve body 3 after “lift zeroing” of valve seat 6, which can reduce the zeroing error to the micrometer level.

[0036] Further, see attached document. Figure 3 Based on the adjustment accuracy (0.01mm), the interval of the scale line 33 on the valve body 3 is determined to be 5°, and it is evenly distributed in seventy-two parts along the circumference. The valve seat 6 is engraved with five pointer lines 63. During assembly, insert a hexagonal wrench into the hexagonal cylindrical hole 62 inside the valve seat, turn the valve seat 6, and screw it clockwise into the valve body 3. Rotate until the valve plate 5 contacts the limit block 4 to complete the "lift zeroing". At this time, select the one of the five pointer lines 63 that is most directly aligned with the scale line 33 as the reference line, and then rotate the reference line counterclockwise. Its variable value is the lift value.

[0037] In one embodiment, reference is made to the appendix. Figure 4 The outer side of the locking ring 7 has a cylindrical surface 72 and an external thread 71 arranged sequentially from top to bottom in the circumferential direction. The tooth profile angle, major diameter, and minor diameter of the external thread 71 correspond one-to-one with the tooth profile angle, major diameter, and minor diameter of the external thread 61 of the valve seat. The outer diameter of the cylindrical surface 72 is smaller than the minor diameter of the external thread 71. The inner diameter of the cylindrical surface 72 is equal to the outer diameter of the outlet of the valve seat 6. The locking ring 7 has two tooling thread through holes 73 with a 180° included angle.

[0038] Furthermore, the parameters (tooth angle and lead) of the locking retainer external thread 71 are the same as those of the valve seat external thread 61, and its inner diameter is consistent with the outer diameter of the gas outlet of the valve seat 6. After the locking retainer 7 is screwed into the valve body 3, it will tighten the valve seat 6. With the above structure, the valve seat 6 can be locked in two stages without affecting the injection flow of the gas injection valve, thereby improving the connection strength between the valve seat 6 and the valve body 3.

[0039] Furthermore, a locking retaining ring cylindrical surface 72 and tooling threaded through holes 73 are adopted. The locking retaining ring cylindrical surface 72 can prevent interference between the locking retaining ring external thread 71 and the valve seat 6. At the same time, the two tooling threaded through holes 73 play a role in assisting in tightening the locking retaining ring 7.

[0040] Furthermore, the valve body 3, valve seat 6, and locking ring 7 adopt right-hand threads. Turning the valve seat 6 clockwise reduces the lift, and turning the valve seat 6 counterclockwise increases the lift.

[0041] In one embodiment, a valve plate 5 is provided at the upper end of the valve seat 6, and a limiting block 4 and an armature 9 are provided at the upper end of the valve plate 5. The limiting block 4 is located outside the armature 9. The armature 9 and the valve plate 5 are fixedly connected by an internal hexagonal head screw 8. Six return springs 11 are fixedly connected between the valve plate 5 and the limiting block 4. After the valve seat 6 is rotated to contact the valve plate 5, the valve seat 6 is rotated until it can no longer be rotated, so that the valve plate 5 is pressed against the limiting block 4, which is used to realize the lift zeroing.

[0042] Furthermore, under the action of the return spring 11, the valve plate 5 does not contact the limit block 4 and maintains a distance; with the above structure, after the rotating valve seat 6 contacts the valve plate 5, the valve seat 6 continues to rotate until it can no longer rotate. At this time, the valve plate 5 is close to the limit block 4, which can achieve "lift zeroing".

[0043] In one embodiment, a solenoid valve assembly 2 is provided at the upper end of the limiting block 4, and a pressure cap 1 is provided at the upper end of the solenoid valve assembly 2. The pressure cap 1 is fixedly connected to the valve body 3 by screws. The pressure cap 1 is used to press the solenoid valve assembly 2 and the limiting block 4 tightly. The terminal block is fixed to the side of the valve body 3. The solenoid valve assembly 2 is electrically connected to the terminal block. The armature 9 is matched with the solenoid valve assembly 2.

[0044] Furthermore, the working principle of this invention is as follows: When the terminal block energizes the solenoid valve assembly 2, the armature 9 is attracted upwards by magnetic attraction, causing the valve plate 5 to move upwards. At this time, the gas injection valve opens, releasing gas flow. When the terminal block de-energizes the solenoid valve assembly 2, the armature 9 loses its magnetic attraction and, under the action of the return spring 11, causes the valve plate 5 to move downwards until it is reset. The valve plate 5 and the valve seat 6 are tightly fitted under the action of the return spring 11. At this time, the gas injection valve closes, ending gas injection.

[0045] In one embodiment, the pressure cap 1 has an annular groove, the wire welded filter assembly 13 is installed in the annular groove, the elastic retaining ring 12 abuts against the upper end of the wire welded filter assembly 13, and the elastic retaining ring 12 is locked between the annular groove and the wire welded filter assembly 13.

[0046] Furthermore, the use of a metal wire welded filter assembly 13 and an elastic retaining ring 12 structure enables the filtration of fuel gas, aiming to improve fuel combustibility while enhancing the sealing performance of the gas injection valve when it is closed.

[0047] In one embodiment, the metal wire welded filter assembly 13 adopts a double-layer metal wire filter structure, including an inner filter and an outer filter. The diameter of the metal wires in the inner filter is larger than that in the outer filter, and the pore size of the inner filter is larger than that of the outer filter. The inner filter serves as a support, while the outer filter serves as a filter.

[0048] Furthermore, the inner filter screen provides support and uses coarse wire diameter and wide pores, while the outer filter screen provides filtration and uses fine wire diameter and small pores.

[0049] Further, see attached document. Figure 1 and 6 The product assembly process of this invention is as follows: First, install the valve seat 6 into the gas outlet of the valve body 3. Use a hex wrench to drive the valve seat 6 into the valve body 3. Then, install the limit block 4, valve plate 5, armature 9, O-ring 10, return spring 11, solenoid valve assembly 2, pressure cap 1, elastic retaining ring 12, and metal wire welded filter assembly 13 into the valve body 3 and tighten them. Then, rotate the valve seat 6 clockwise to complete the "lift zeroing". At this time, start rotating the valve seat 6 counterclockwise. Determine the lift value according to the change of the reference line 63 pointing to the scale line 33 of the valve body 3, so as to realize the adjustable flow of the gas injection valve. After the adjustment is completed, screw the locking retaining ring 7 into the valve body 3 to lock the valve seat 6 a second time. When rotating the locking retaining ring 7, a screw can be used to tighten it by screwing it into the tool thread hole.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An adjustable flow gas injection valve, comprising a gas injection valve body, characterized in that, The gas injection valve body includes a valve housing, a valve seat, and a locking ring. The valve housing and valve seat are threaded together, and the lift is adjusted by screwing the valve seat in or out, which is used to regulate the flow rate of the gas injection valve body during the production and assembly stage. The locking ring is located below the valve seat and is threaded together with the valve housing. By rotating the locking ring until it abuts against the lower end face of the valve seat, it is used to perform secondary locking of the valve seat. The valve housing has an axial flow pipe structure. The outlet of the valve housing is provided with an internal thread. The lower end face of the internal thread of the valve housing is provided with a cylindrical surface of the valve housing. The cylindrical surface of the valve housing is provided with scale lines, which are evenly distributed along the circumference of the cylindrical surface of the valve housing.

2. The adjustable flow gas injection valve according to claim 1, characterized in that, The gas injection valve body also includes an O-ring seal. An O-ring seal groove is provided on the inner side wall of the valve body. The O-ring seal groove is located above the end point of the internal thread of the valve body. The O-ring seal is installed in the O-ring seal groove and is located between the inner end face of the valve seat and the end point of the internal thread of the valve body.

3. The adjustable flow gas injection valve according to claim 1, characterized in that, The valve seat has an external thread in the circumferential direction on its outer side. The external thread of the valve seat is adapted to the internal thread of the valve body. An internal hexagonal cylindrical hole is opened at the center of the outer end face of the valve seat. The outer end face of the valve seat is also provided with a pointer line, which is used in conjunction with the scale line.

4. The adjustable flow gas injection valve according to claim 3, characterized in that, The pointer line consists of five pointer lines spaced 1° apart.

5. An adjustable flow gas injection valve according to claim 3, characterized in that, The outer side of the locking retaining ring is provided with a cylindrical surface and an external thread in the circumferential direction from top to bottom. The tooth profile angle, major diameter, and minor diameter of the external thread of the locking retaining ring correspond one-to-one with the tooth profile angle, major diameter, and minor diameter of the external thread of the valve seat. The outer diameter of the cylindrical surface of the locking retaining ring is smaller than the minor diameter of the external thread of the locking retaining ring. The inner diameter of the cylindrical surface of the locking retaining ring is equal to the outer diameter of the air outlet of the valve seat. Two tooling threaded through holes with a 180° included angle are provided on the locking retaining ring.

6. The adjustable flow gas injection valve according to claim 1, characterized in that, The gas injection valve body also includes a pressure cap, a solenoid valve assembly, a limit block, a valve plate, an armature, return springs, and a terminal block. A valve plate is mounted on the upper end of the valve seat, and a limit block and armature are mounted on the upper end of the valve plate. The limit block is located outside the armature. The armature and valve plate are fixedly connected by hexagonal head screws. Six return springs are fixed between the valve plate and the limit block. After rotating the valve seat to contact the valve plate, continuing to rotate the valve seat until it can no longer rotate, causing the valve plate to press against the limit block, is used to achieve zero-lift calibration. A solenoid valve assembly is mounted on the upper end of the limit block, and a pressure cap is mounted on the upper end of the solenoid valve assembly. The pressure cap and valve body... The components are fixedly connected by screws. The pressure cap is used to press the solenoid valve assembly and the limit block. The terminal block is fixed to the side of the valve body. The solenoid valve assembly is electrically connected to the terminal block. The armature is matched with the solenoid valve assembly. When the terminal block powers the solenoid valve assembly, the armature is magnetically attracted upward, causing the valve plate to move upward. At this time, the gas injection valve opens and gas flows out. When the terminal block de-energizes the solenoid valve assembly, the armature loses its magnetic attraction and, under the action of the return spring, causes the valve plate to move downward until it returns to its original position. The valve plate and the valve seat are tightly fitted under the action of the return spring. At this time, the gas injection valve closes and gas injection ends.

7. An adjustable flow gas injection valve according to claim 6, characterized in that, The gas injection valve body also includes an elastic retaining ring and a metal wire welded filter assembly. The gland has an annular groove, the metal wire welded filter assembly is installed in the annular groove, the elastic retaining ring abuts against the upper end of the metal wire welded filter assembly, and the elastic retaining ring is locked between the annular groove and the metal wire welded filter assembly.

8. An adjustable flow gas injection valve according to claim 7, characterized in that, The metal wire welded filter assembly adopts a double-layer metal wire filter structure, including an inner filter and an outer filter. The diameter of the metal wires in the inner filter is larger than that in the outer filter, and the pore size of the inner filter is larger than that of the outer filter. The inner filter serves as a support, while the outer filter serves as a filter.

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