High-precision long-service-life ammonia gas electronic control injection valve

Abstract

The utility model provides a high-precision long-service-life ammonia gas electronic control injection valve which comprises a valve body and an electromagnetic assembly. A plurality of air inlets and air outlets are machined in the two side walls of the middle of the valve body in the circumferential direction respectively, a valve seat is installed in a hole, between the air inlets and the air outlets, of the valve body in a tight fit mode, a steel ball is arranged in the valve seat, a spring assembly is installed in one tail end of the valve body and makes elastic contact with the steel ball, and the other end of the valve body is connected with an electromagnetic assembly. The electromagnetic assembly is installed on the pole shoe assembly, a through hole is formed in the center of the pole shoe assembly, an ejector rod is assembled in the through hole and extends into the valve body to be connected with the steel ball, and the other end of the ejector rod is connected with the armature assembly. The parts in contact with the ammonia gas are made of materials compatible with the ammonia gas, so that the ammonia gas corrosion resistance is higher; the valve element assembly of the injection valve is of a metal ball valve structure, the problem that the injection valve is difficult to overcome ammonia corrosion is solved, the valve seat and the valve element are both made of metal, and the shock resistance frequency of the valve seat and a steel ball is increased.

Description

Technical Field

[0001] This utility model relates to a high-precision, long-life ammonia electronically controlled injection valve. Background Technology

[0002] In the development of the new energy vehicle industry, alternative fuels are an important research area for heavy-duty vehicles. Over the past thirty years, natural gas engines and hydrogen engines have been introduced. Because ammonia has an extremely high nitrogen content, its combustion products are mainly nitrogen and water, producing almost no carbon dioxide, which helps mitigate the greenhouse effect and aligns with the development direction of green energy. Furthermore, ammonia can be produced through various methods, not limited by petroleum resources. In addition, ammonia can be liquefied by cooling it to -33.4℃ at normal pressure or by pressurizing it to 0.7–0.8 MPa at room temperature. After liquefaction, its volume is significantly reduced, facilitating storage and transportation. These advantages of ammonia have attracted attention in recent years, and major engine manufacturers are researching and developing ammonia engines.

[0003] Currently, engine gas control systems developed on the market are mainly used for natural gas media. Their injection valve cores mostly adopt non-metallic sealing structures. However, the strong corrosiveness of ammonia makes it difficult for current injection valves to work for a long time in an ammonia environment.

[0004] To improve the service life of injection valves, CN200964914Y discloses a high-precision gas injection valve. This valve achieves online flow regulation by adjusting the valve seat position through a compression method, thus improving the flow control accuracy. Improvements to the push rod and the conventional closing mechanism enhance its reliability. However, during the closing process, the armature is prone to collision with the armature cover, leading to armature damage. Furthermore, the lack of a seal between the mechanism and the valve body necessitates advanced manufacturing processes to ensure a proper seal. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a high-precision, long-life ammonia electronically controlled injection valve.

[0006] This utility model is achieved through the following technical solution.

[0007] This utility model provides a high-precision, long-life ammonia electronically controlled injection valve, comprising a valve body and an electromagnetic assembly. Both the valve body and the electromagnetic assembly have a through hole at their centers. The valve body has several inlets and outlets machined circumferentially on two side walls in the middle section. A valve seat is tightly fitted into the hole between the inlets and outlets on the valve body. A steel ball is installed inside the valve seat. A spring assembly is installed at one end of the valve body, making elastic contact with the steel ball. The other end of the valve body is connected to the electromagnetic assembly, which is mounted on a pole shoe assembly. The pole shoe assembly has a through hole at its center, and a push rod is fitted inside the through hole. One end of the push rod extends into the valve body and connects to the steel ball, while the other end connects to the armature assembly.

[0008] The electromagnetic component includes a coil frame with an annular groove on the outside of the coil frame. A coil is wound in the annular groove. An electromagnetic cover is also provided on the outside of the coil frame. The electromagnetic cover and the coil frame enclose the coil. A plastic shell is also wrapped on the outer wall of the electromagnetic cover and one side of its end.

[0009] The plastic shell is also machined with a wire insertion hole, and a contact piece is installed in the wire insertion hole. The contact piece is connected to the coil.

[0010] The pole shoe assembly has a boss in the middle. One end of the pole shoe assembly extends into the valve body. The side of the boss abuts against the side of the valve body. The other end of the pole shoe assembly is welded with an armature cover. The opening of the armature cover is welded to the side of the boss. The bottom of the armature cover is machined with a threaded hole and fitted with a locking bolt. An elastic pad is also installed between the locking bolt and the armature cover. The edge of the elastic pad contacts the plastic shell.

[0011] The armature assembly includes an armature, one end of which is connected to the center of a push rod, and a shock absorber is installed on the other end face. The armature and the shock absorber are located inside the armature cover.

[0012] The outer wall of the valve seat is provided with a raised tight-fitting surface, and a stepped hole facing the spring assembly is machined inside the valve seat, and a grinding surface is machined at the connection between the two holes in the stepped hole.

[0013] The spring assembly includes a spring seat and a conical spring. The spring seat is fixed at the outlet of the valve body, and the conical spring is installed between the spring seat and the steel ball. A spring pin is installed on the spring seat at the center of the conical spring. The distance between the conical spring and the steel ball is smaller than the gap between the armature and the pole shoe assembly.

[0014] The outer wall of the valve body is machined with a first sealing groove and a second sealing groove, which are located on both sides of the air outlet.

[0015] The air inlet is also covered with a filter screen.

[0016] The valve body is also fitted with a guide seat adjacent to the pole shoe assembly, and the guide seat has a through hole with the same diameter as the push rod.

[0017] The valve body is made of 316L; the pole shoe and armature are made of 1J117; the valve seat, push rod and steel ball are made of 9Cr18; and the sealing material is FFKM.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. All parts that come into contact with ammonia are made of materials compatible with ammonia, enabling them to work for extended periods in an ammonia environment and exhibiting strong resistance to ammonia corrosion.

[0020] 2. The valve core assembly of the injection valve adopts a metal ball valve structure. This not only solves the problem of ammonia corrosion that is difficult to overcome when using a rubber baffle injection valve, but also increases the impact resistance of the valve seat and steel ball by using metal, thus improving the service life of the injection valve.

[0021] 3. The stroke and air gap of the injection valve are adjusted by pressure fitting (i.e., valve seat and spring seat assembly from left to right), which can accurately adjust the stroke and air gap values, improve the flow control accuracy of the injection valve and the consistency of response between valves. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the valve body and electromagnetic assembly of this utility model;

[0024] Figure 3 This is a schematic diagram of the spring assembly of this utility model;

[0025] Figure 4 This is a schematic diagram of the valve body assembly structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the valve seat structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the pole shoe structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the top rod structure of this utility model;

[0029] Figure 8 This is a schematic diagram of the gap structure between the steel ball and the valve seat, and between the pole shoe and the armature of this utility model.

[0030] In the diagram: 1-Valve body, 11-Shock damping pad, 12-Limiting protrusion, 13-Air inlet, 14-First sealing groove, 15-Air outlet, 16-Second sealing groove, 17-Installation limiting groove, 18-Filter screen, 19-Anti-rotation protrusion, 2-Pole shoe assembly, 21-Pole shoe sealing ring, 22-Guide hole, 3-Electromagnetic assembly, 31-Coil frame, 32-Coil, 4-Armature assembly, 41-Armature, 42-Armature cover, 43-Anti-collision pad, 44-Elastic pad, 45-Locking bolt, 5-Top rod, 51-Guide seat, 6-Valve seat, 61-Fitting surface, 62-Stepped hole, 63-Grinding surface, 7-Steel ball, 8-Spring assembly, 81-Spring seat, 82-Conical spring, 9-Plastic shell, 91-Wire insertion hole, 92-Contact piece, 10-Electromagnetic cover. Detailed Implementation

[0031] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0032] A high-precision, long-life ammonia electronically controlled injection valve includes a valve body 1 and an electromagnetic component 3. Both the valve body 1 and the electromagnetic component 3 have a through hole at their centers. The valve body 1 has several inlets 13 and outlets 15 machined circumferentially on two side walls in the middle section. A valve seat 6 is tightly fitted into the hole between the inlets 13 and outlets 15 on the valve body 1. A steel ball 7 is installed inside the valve seat 6. A spring assembly 8 is installed at one end of the valve body 1, making elastic contact with the steel ball 7. The other end of the valve body 1 is connected to the electromagnetic component 3. The electromagnetic component 3 is mounted on a pole shoe assembly 2. The pole shoe assembly 2 has a through hole at its center, and a push rod 5 is fitted inside the through hole. One end of the push rod 5 extends into the valve body 1 and connects to the steel ball 7, while the other end connects to an armature assembly 4. When the solenoid assembly of the injection valve is energized, the electromagnetic force causes the armature assembly to move to the left. The push rod in the armature assembly strikes the steel ball, causing the steel ball to move to the left until it contacts the spring pin in the spring seat assembly and stops moving. At this point, the injection valve opens, and ammonia gas flows from the inlet to the outlet. The gap L2 between the steel ball and the valve seat at this time determines the flow rate of the injection valve. Figure 8 (As shown). When the injection valve is de-energized, the electromagnetic force disappears, and the steel ball moves to the right under the action of spring force and pressure. The steel ball strikes the push rod in the armature assembly, causing the armature assembly to move to the right. When the steel ball contacts the valve seat, the steel ball stops moving, and the injection valve closes. Figure 1 As shown), but due to inertia, the armature assembly continues to move to the right until the anti-collision pad 43 in the armature assembly contacts the armature cover 42 and the armature assembly stops moving.

[0033] The stroke of the injection valve is determined by the position of the push valve seat 6 within the orifice of the valve body 1; the air gap of the injection valve is determined by the position of the push spring assembly 8 within the orifice of the valve body 1.

[0034] Furthermore, the electromagnetic component 3 includes a coil frame 31, an annular groove on the outside of the coil frame 31, a coil 32 wound in the annular groove, an electromagnetic cover 10 on the outside of the coil frame 31, the electromagnetic cover 10 and the coil frame 31 enclose the coil 32, and a plastic shell 9 is also wrapped on the outer wall of the electromagnetic cover 10 and one side of it.

[0035] The plastic shell 9 is also machined with a wire insertion hole 91, and a contact piece 92 is installed in the wire insertion hole 91. The contact piece 92 is connected to the coil 32.

[0036] Furthermore, the pole shoe assembly 2 has a boss in the middle. One end of the pole shoe assembly 2 extends into the valve body 1, and the side of the boss abuts against the side of the valve body 1. The other end of the pole shoe assembly 2 is welded with an armature cover 42. The opening of the armature cover 42 is welded to the side of the boss. The bottom of the armature cover 42 has a threaded hole and is fitted with a locking bolt 45. An elastic washer 44 is also installed between the locking bolt 45 and the armature cover 42, and the edge of the elastic washer 44 contacts the plastic shell 9. The electromagnetic component is fixed to the pole shoe by the locking bolt and the elastic washer. The armature cover and the pole shoe assembly are tightly fitted, and the interface is laser welded. The pole shoe assembly is tightly fitted to the valve body and an O-ring seal is added, forming a double protection with the welded armature cover to prevent leakage from the injection valve.

[0037] Furthermore, the armature assembly 4 includes an armature 41, one end of which is connected to the center of the push rod 5, and a shock absorber 43 is installed on the other end face. The armature 41 and the shock absorber 43 are located inside the armature cover 42. The injection valve adopts a metal ball valve structure (metal-metal seal). Compared with the baffle seal (plastic-metal seal), the metal ball valve structure can better overcome ammonia corrosion. The valve seat sealing surface is ground to produce a high-precision arc-shaped surface with the same diameter as the steel ball. Figure 5 In addition to providing reliable sealing, it can also reduce contact stress, improve service life and accuracy; the metal valve structure is impact-resistant and does not easily deform under long-term impact, which can ensure the accuracy and long-term stability of the injection valve (in the baffle seal, the plastic baffle may be deformed due to ammonia corrosion or long-term impact, which will cause the injection valve stroke, i.e., the flow rate changes or the sealing performance is reduced, thus affecting the accuracy of the injection valve).

[0038] Furthermore, the outer wall of the valve seat 6 is provided with a raised tight-fitting surface 61, and the valve seat 6 is machined with a stepped hole 62 facing the spring assembly 8, and the connection between the two holes in the stepped hole 62 is machined with a ground surface 63. The valve seat and the valve body are tightly fitted. During installation, the valve seat is pressed into the valve body by a tight-fitting method, and its position is easy to adjust, so that the flow of the injection valve can be precisely controlled.

[0039] Furthermore, the spring assembly 8 includes a spring seat 81 and a conical spring 82. The spring seat 81 is fixed at the outlet of the valve body 1, and the conical spring 82 is installed between the spring seat 81 and the steel ball 7. A spring pin is installed on the spring seat 81 at the center of the conical spring 82. The distance between the spring pin and the steel ball 7 is smaller than the gap between the armature 41 and the pole shoe assembly 2. The spring seat assembly is a press-fit assembly, which precisely adjusts the stroke L2 and the air gap L3 to improve the accuracy of the injection valve. The push rod in the armature assembly and the spring pin in the spring seat assembly are designed with ball-and-socket features to improve the impact resistance with the steel ball and thus improve the life of the injection valve. The armature assembly is designed with an anti-collision pad, which is made of heat-treated stainless steel, to improve the impact resistance of the armature assembly and thus improve the life of the injection valve.

[0040] Furthermore, in order to facilitate sealing during installation, a first sealing groove 14 and a second sealing groove 16 are respectively machined on the outer wall of the valve body 1. The first sealing groove 14 and the second sealing groove 16 are respectively located on both sides of the air outlet 15, and O-rings are respectively installed in the first sealing groove 14 and the second sealing groove 16.

[0041] Furthermore, in order to increase the life of the injection valve, a filter screen 18 is also covered outside the air inlet 13 to filter the ammonia gas entering the valve body and equipment, and to prevent impurities from entering the valve body and equipment.

[0042] Furthermore, to improve the displacement accuracy of the push rod, a guide seat 51 is tightly fitted inside the valve body 1 adjacent to the pole shoe assembly 2. The guide seat 51 has a through hole with the same diameter as the push rod 5. During the reciprocating motion of the armature assembly, the push rod guide seat and the pole shoe guide hole guide the armature assembly, ensuring smooth and accurate reciprocating motion of the armature assembly, thereby improving the accuracy of the injection valve.

[0043] Furthermore, a vibration damping pad is designed between the injection valve and the main unit. The vibration damping pad absorbs vibration energy, reduces the impact force on the injection valve, and thus improves the service life of the injection valve.

Claims

1. A high-precision, long-life ammonia electro-controlled injection valve, comprising a valve body (1) and an electromagnetic assembly (3), characterized in that: Both the valve body (1) and the electromagnetic assembly (3) have through holes in their centers. The valve body (1) has several air inlets (13) and air outlets (15) machined circumferentially on two side walls in the middle. A valve seat (6) is installed in the hole between the air inlets (13) and the air outlets (15) of the valve body (1) by a tight fit. A steel ball (7) is provided in the valve seat (6). A spring assembly (8) is installed in one end of the valve body (1) and makes elastic contact with the steel ball (7). The other end of the valve body (1) is connected to the electromagnetic assembly (3). The electromagnetic assembly (3) is installed on the pole shoe assembly (2). The pole shoe assembly (2) has a through hole in its center. A push rod (5) is installed in the through hole. One end of the push rod (5) extends into the valve body (1) and is connected to the steel ball (7). The other end is connected to the armature assembly (4).

2. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The electromagnetic component (3) includes a coil frame (31), an annular groove is provided on the outside of the coil frame (31), a coil (32) is wound in the annular groove, and an electromagnetic cover (10) is also provided on the outside of the coil frame (31). The electromagnetic cover (10) and the coil frame (31) enclose the coil (32), and a plastic shell (9) is also wrapped on the outer wall of the electromagnetic cover (10) and one side of it.

3. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 2, characterized in that: The plastic shell (9) is also machined with a wire insertion hole (91), and a contact piece (92) is installed in the wire insertion hole (91). The contact piece (92) is connected to the coil (32).

4. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The pole shoe assembly (2) has a boss in the middle. One end of the pole shoe assembly (2) extends into the valve body (1). The side of the boss abuts against the side of the valve body (1). The other end of the pole shoe assembly (2) is welded with an armature cover (42). The opening of the armature cover (42) is welded to the side of the boss. The bottom of the armature cover (42) is machined with a threaded hole and fitted with a locking bolt (45). An elastic pad (44) is also installed between the locking bolt (45) and the armature cover (42). The edge of the elastic pad (44) contacts the plastic shell (9).

5. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The armature assembly (4) includes an armature (41), one end of which is connected to the top rod (5), and a bumper pad (43) is installed on the other end face. The armature (41) and the bumper pad (43) are located inside the armature cover (42).

6. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The valve seat (6) has a raised mating surface (61) on its outer wall. The valve seat (6) has a stepped hole (62) facing the spring assembly (8) and a grinding surface (63) is machined at the connection of the two holes in the stepped hole (62).

7. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The spring assembly (8) includes a spring seat (81) and a conical spring (82). The spring seat (81) is fixed at the outlet of the valve body (1). The conical spring (82) is installed between the spring seat (81) and the steel ball (7). A spring pin is installed on the spring seat (81) at the center of the conical spring (82). The distance between the conical spring (82) and the steel ball (7) is smaller than the gap between the armature (41) and the pole shoe assembly (2).

8. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The valve body (1) has a first sealing groove (14) and a second sealing groove (16) respectively machined on its outer wall. The first sealing groove (14) and the second sealing groove (16) are located on both sides of the air outlet (15).

9. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The air inlet (13) is also covered with a filter screen (18).

10. The high-precision, long-life ammonia electronically controlled injection valve as described in claim 1, characterized in that: The valve body (1) is also fitted with a guide seat (51) adjacent to the pole shoe assembly (2), and the guide seat (51) has a through hole with the same diameter as the push rod (5).

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