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

Abstract

The invention 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 ammonia gas are made of materials compatible with the ammonia gas, so that the ammonia gas corrosion resistance is relatively high; 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] The present invention relates to an ammonia electro-control injection valve with high precision and long service life. Background Art

[0002] In the development process of the new energy vehicle industry, alternative fuels are an important research field for heavy vehicles. In the past three decades, natural gas engines and hydrogen engines have been successively introduced. Since ammonia has a very high nitrogen content, the combustion products are mainly nitrogen and water, hardly producing carbon dioxide, which helps to alleviate the greenhouse effect, conforms to the development direction of green energy, and ammonia can be produced through various channels without being restricted by petroleum resources. In addition, ammonia can be liquefied by cooling to -33.4°C at normal pressure or pressurizing to 0.7 - 0.8 MPa at room temperature. After liquefaction, the volume is greatly reduced, which is convenient for storage and transportation. The above advantages of ammonia have attracted people's attention in recent years, and most engine mainframe enterprises are researching and developing ammonia engines.

[0003] At present, the engine gas control systems developed in the market are mainly used for natural gas media, and most of the injection valve spools adopt non-metal sealing structures. However, due to the strong corrosiveness of ammonia, the current injection valves are difficult to work for a long time in an ammonia environment.

[0004] In order to improve the service life of the injection valve, for example, CN200964914Y discloses a gas high-precision injection valve, which realizes the online adjustment of flow rate by adjusting the position of the valve seat in a pressing manner, improves the flow control accuracy of the injection valve, and improves the reliability of its operation by improving the ejector rod and the ordinary closing method. However, during the closing process, the armature is prone to collide with the armature cover, resulting in easy damage to the armature, and there is no seal between the mechanism and the valve body, so it must adopt a high processing technology to ensure the sealing effect of the injection valve. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an ammonia electro-control injection valve with high precision and long service life.

[0006] The present invention is achieved through the following technical solutions.

[0007] An ammonia electro-control injection valve with high precision and long service life provided by the present invention includes a valve body and an electromagnetic assembly; through holes are provided in the centers of both the valve body and the electromagnetic assembly. On the circumferences of two side walls in the middle of the valve body, a number of air inlets and air outlets are respectively machined. A valve seat is tightly fitted in the hole between the air inlet and the air outlet of the valve body. A steel ball is provided in the valve seat. A spring assembly is installed at one end of the valve body and is in elastic contact with the steel ball. The other end of the valve body is connected to the electromagnetic assembly. The electromagnetic assembly is installed on the pole shoe assembly. A through hole is provided in the center of the pole shoe assembly. A ejector rod is assembled in the through hole. One end of the ejector rod extends into the valve body and is connected to the steel ball, and the other end is connected to the armature assembly.

[0008] The electromagnetic component includes a coil bobbin. An annular groove is provided on the outer side of the coil bobbin, and a coil is wound in the annular groove. An electromagnetic cover is also provided on the outer side of the coil bobbin. The electromagnetic cover and the coil bobbin wrap the coil. A plastic shell also wraps the outer wall and one end side of the electromagnetic cover.

[0009] The plastic shell is also processed 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] A boss is provided in the middle of the pole shoe component. One end of the pole shoe component extends into the valve body, and the side surface of the boss abuts against the side surface of the valve body. The other end of the pole shoe component is welded with an armature cover. The opening of the armature cover is welded to the side surface of the boss. A threaded hole is processed at the bottom of the armature cover and is equipped with a locking bolt. An elastic pad is also installed between the locking bolt and the armature cover, and the edge of the elastic pad contacts the plastic shell.

[0011] The armature component includes an armature. The center of one end of the armature is connected to a push rod, and an anti-collision pad is installed on the end surface of the other end. The armature and the anti-collision pad are arranged in the armature cover.

[0012] A raised tight-fitting surface is provided on the outer wall of the valve seat. A stepped hole facing the spring component is processed in the valve seat, and a lapped surface is processed at the connection of the two holes in the stepped hole.

[0013] The spring component includes a spring seat and a conical spring. The spring seat is fixed at the outlet of the valve body. 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 less than the gap between the armature and the pole shoe component.

[0014] A first sealing groove and a second sealing groove are respectively processed on the outer wall of the valve body. The first sealing groove and the second sealing groove are respectively on both sides of the air outlet.

[0015] A filter screen is also covered outside the air inlet.

[0016] A guide seat is also tightly fitted adjacent to the pole shoe component in the valve body. A through hole with the same diameter as the push rod is processed in the guide seat.

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

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. All parts in contact with ammonia are selected with materials compatible with ammonia, can work for a long time in an ammonia environment, and have strong ammonia corrosion resistance.

[0020] 2. The spool assembly of the injection valve adopts a metal ball valve structure, which can not only solve the problem that it is difficult to overcome ammonia corrosion in the injection valve with a rubber baffle, but also the valve seat and the spool are both made of metal, increasing the number of impact resistance between the valve seat and the steel ball and improving the service life of the injection valve.

[0021] 3. The stroke and air gap of the injection valve both adopt a press-fit adjustment method (that is, the valve seat and the spring seat assembly are arranged in sequence from left to right), which can accurately adjust the stroke value and air gap value, and improve the flow control accuracy of the injection valve and the response consistency between valves. Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the valve body and the electromagnetic assembly of the present invention;

[0024] Figure 3 It is a schematic diagram of the spring assembly of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the valve body assembly of the present invention;

[0026] Figure 5 It is a schematic diagram of the valve seat structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the pole shoe structure of the present invention;

[0028] Figure 7 It is a schematic diagram of the ejector rod structure of the present invention;

[0029] Figure 8 It is a schematic diagram of the clearance structure between the steel ball and the valve seat and between the pole shoe and the armature of the present invention.

[0030] In the figure: 1-valve body, 11-shock pad, 12-limit projection, 13-air inlet, 14-first sealing groove, 15-air outlet, 16-second sealing groove, 17-mounting limit groove, 18-filter screen, 19-anti-rotation boss, 2-pole shoe assembly, 21-pole shoe seal ring, 22-guide hole, 3-electromagnetic assembly, 31-coil skeleton, 32-coil, 4-armature assembly, 41-armature, 42-armature cover, 43-anti-collision pad, 44-elastic pad, 45-lock bolt, 5-ejector rod, 51-guide seat, 6-valve seat, 61-tight fitting surface, 62-step hole, 63-grinding surface, 7-steel ball, 8-spring assembly, 81-spring seat, 82-taper spring, 83-spring pin, 9-plastic shell, 91-wiring hole, 92-contact piece, 10-electromagnetic cover. Detailed Embodiments

[0031] The technical solution of the present invention will be further described below, but the scope of protection is not limited thereto.

[0032] A high-precision and long-life ammonia electro-control injection valve includes a valve body 1 and an electromagnetic assembly 3. Through holes are provided in the centers of both the valve body 1 and the electromagnetic assembly 3. On the circumferences of two side walls in the middle of the valve body 1, a number of air inlets 13 and air outlets 15 are respectively machined. 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 means of 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 is in 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. A through hole is provided in the center of the pole shoe assembly 2. A push rod 5 is assembled 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, and the other end is connected to the armature assembly 4. When the electromagnetic assembly of the injection valve is energized and operates, the electromagnetic force causes the armature assembly to move to the left. The push rod in the armature assembly impacts the steel ball and causes the steel ball to move to the left until the steel ball stops moving when it contacts the spring pin in the spring seat assembly. At this time, the injection valve opens, and ammonia flows from the inlet to the outlet. At this time, the gap L2 between the steel ball and the valve seat determines the flow rate of the injection valve ( Figure 8 as shown). When the injection valve is de-energized, the electromagnetic force disappears. The steel ball moves to the right under the action of the spring force and pressure. The steel ball impacts the push rod in the armature assembly and causes 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). However, at this time, 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 pushing the position of the valve seat 6 in the hole of the valve body 1; the air gap of the injection valve is determined by pushing the position of the spring assembly 8 in the hole of the valve body 1.

[0034] Furthermore, the electromagnetic assembly 3 includes a coil bobbin 31. An annular groove is provided on the outer side of the coil bobbin 31. A coil 32 is wound in the annular groove. An electromagnetic cover 10 is also provided on the outer side of the coil bobbin 31. The electromagnetic cover 10 and the coil bobbin 31 wrap the coil 32. A plastic shell 9 is also wrapped on the outer wall and one end side of the electromagnetic cover 10.

[0035] An insertion hole 91 is also machined on the plastic shell 9. A contact piece 92 is installed in the insertion hole 91. The contact piece 92 is connected to the coil 32.

[0036] Furthermore, a boss is provided in the middle of the pole shoe assembly 2. One end of the pole shoe assembly 2 extends into the valve body 1, and the side surface of the boss abuts against the side surface of the valve body 1. The other end of the pole shoe assembly 2 is welded to an armature cover 42. The opening of the armature cover 42 is welded to the side surface of the boss. A threaded hole is machined at the bottom of the armature cover 42 and a locking bolt 45 is assembled. An elastic pad 44 is also installed between the locking bolt 45 and the armature cover 42, and the edge of the elastic pad 44 contacts the plastic shell 9. The electromagnetic assembly is fixed to the pole shoe through the locking bolt and the elastic pad. The armature cover is in tight fit with the pole shoe assembly, and the interface is laser welded. And a tight fit is provided between the pole shoe assembly and the valve body and an O-ring seal is added, forming a double protection with the welded armature cover to prevent external leakage of the injection valve.

[0037] Furthermore, the armature assembly 4 includes an armature 41. The center of one end of the armature 41 is connected to the ejector rod 5, and an anti-collision pad 43 is installed on the other end surface. The armature 41 and the anti-collision pad 43 are arranged 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 of the valve is ground to produce a high-precision arc surface with the same diameter as the steel ball ( Figure 5 ), which can not only provide reliable sealing, but also reduce the contact stress, improve the service life and accuracy; the metal valve structure is impact-resistant and not easily deformed under long-term working 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 and long-term impact, resulting in changes in the stroke of the injection valve, that is, the flow rate or a decrease in the sealing performance, thus affecting the accuracy of the injection valve).

[0038] Furthermore, a raised tight-fitting surface 61 is provided on the outer wall of the valve seat 6. A stepped hole 62 facing the spring assembly 8 is machined inside the valve seat 6, and a ground surface 63 is machined at the connection of the two holes in the stepped hole 62. A tight fit is provided between the valve seat and the valve body. When installed, the valve seat is pressed into the valve body by a pressing method, and its position is convenient to adjust, so as to accurately control the flow rate of the injection valve.

[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. 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, and the distance between the spring pin and the steel ball 7 is less than the gap between the armature 41 and the pole shoe assembly 2. The spring seat assembly is assembled in a compressed manner to accurately adjust the stroke L2 and the air gap L3, thereby improving the accuracy of the injection valve. The ejector rod in the armature assembly and the spring pin in the spring seat assembly are designed with ball socket features to improve the impact ability with the steel ball, thereby improving the service life of the injection valve; an anti-collision pad is designed in the armature assembly. This part is heat-treated stainless steel, which can improve the impact ability of the armature assembly, thereby improving the service life of the injection valve.

[0040] Further, to facilitate sealing during the installation of the injection valve, 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 on both sides of the air outlet 15, and O-ring seals are respectively installed in the first sealing groove 14 and the second sealing groove 16.

[0041] Further, to increase the service 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 the equipment, preventing foreign objects from entering the valve body and the equipment.

[0042] Further, to improve the displacement accuracy of the ejector rod, a guide seat 51 is tightly fitted adjacent to the pole shoe assembly 2 in the valve body 1. A through hole with the same diameter as the ejector rod 5 is machined in the guide seat 51. During the reciprocating movement of the armature assembly, the ejector rod guide seat and the pole shoe guide hole guide the armature assembly, ensuring the smooth and precise reciprocating movement of the armature assembly and thus improving the accuracy of the injection valve.

[0043] Further, a vibration damping pad is designed between the injection valve and the main engine. The vibration damping pad absorbs vibration energy and reduces the impact force on the injection valve, thereby increasing the service life of the injection valve.

Claims

1. A high-precision, long-life, electrically controlled ammonia injection valve, comprising a valve body (1) and an electromagnetic assembly (3), characterized in that: The valve body (1) and the electromagnetic assembly (3) are both provided with through holes at their centers. A plurality of air inlets (13) and air outlets (15) are respectively processed on the circumference of two side walls in the middle of the valve body (1). A valve seat (6) is installed in the hole between the air inlet (13) and the air outlet (15) of the valve body (1) through 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) to elastically contact 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). A through hole is provided in the center of the pole shoe assembly (2). A push rod (5) is installed in the through hole. One end of the push rod (5) extends into the valve body (1) to be connected to the steel ball (7), and the other end is connected to the armature assembly (4).

2. The high-precision and long-life ammonia electronically controlled injection valve according to claim 1, characterized in that: The electromagnetic assembly (3) comprises 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, an electromagnetic cover (10) is also provided on the outside of the coil frame (31), the electromagnetic cover (10) and the coil frame (31) wrap the coil (32), and a plastic shell (9) is also wrapped on the outer wall of the electromagnetic cover (10) and the side surface of one end.

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

4. The high-precision and long-life ammonia electronically controlled injection valve according to claim 1, characterized in that: A boss is provided in the middle of the pole shoe assembly (2), one end of the pole shoe assembly (2) extends into the valve body (1), the side of the boss contacts 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, a threaded hole is machined on the bottom of the armature cover (42) and a locking bolt (45) is installed, an elastic pad (44) is also installed between the locking bolt (45) and the armature cover (42), and the edge of the elastic pad (44) contacts the plastic shell (9).

5. The high-precision and long-life ammonia electronically controlled injection valve according to claim 1, characterized in that: The armature assembly (4) comprises an armature (41), one end of the armature (41) is connected to the top rod (5) at its center, and an anti-collision pad (43) is installed on the end surface of the other end. The armature (41) and the anti-collision pad (43) are arranged in an armature cover (42).

6. The high-precision and long-life ammonia electronically controlled injection valve according to claim 1, characterized in that: A raised tight-fitting surface (61) is provided on the outer wall of the valve seat (6), a stepped hole (62) facing the spring assembly (8) is machined inside the valve seat (6), and a grinding surface (63) is machined at the connection between two holes in the stepped hole (62).

7. The high-precision and long-life ammonia electronically controlled injection valve according to claim 1, characterized in that: The spring assembly (8) comprises 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); and 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 and long-life ammonia electronically controlled injection valve according to claim 1, characterized in that: A first sealing groove (14) and a second sealing groove (16) are respectively processed on the outer wall of the valve body (1), and the first sealing groove (14) and the second sealing groove (16) are respectively located on both sides of the air outlet (15).

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

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

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