Liquid ammonia nozzle for multi-point electric control injection of air inlet channel

Abstract

The utility model provides a liquid ammonia nozzle for multi-point electric control injection of an air inlet channel. The liquid ammonia nozzle comprises a valve body and a pole shoe, a round through hole is machined in the center of the valve body, one end of the valve body is welded to the outer wall of the pole shoe, a plurality of air inlets are machined in the middle of the valve body in the circumferential direction of the valve body and communicated with the through hole in the valve body, a valve seat is fixedly installed in the other end of the valve body, and an air outlet channel is machined in the valve seat. A coil assembly is fixedly wrapped outside the pole shoe, an armature assembly is further installed in the adjusting pad, one end of the armature assembly is adjacent to the coil assembly, a spring is arranged between the armature assembly and the coil assembly, and the other end of the armature assembly extends into the valve seat to control opening and closing of the air outlet channel. The nozzles adopt a unique layout mode of side air supply and end injection, so that the layout of the nozzles on the air inlet pipe is facilitated; the nozzle adopts a metal needle valve structure, and a moving part adopts a low-inertia design, so that the control precision of the nozzle is improved, and the service life of the nozzle is prolonged.

Description

Technical Field

[0001] This utility model relates to a liquid ammonia nozzle for multi-point electronically controlled injection in the intake manifold of an internal combustion engine. Background Technology

[0002] Because ammonia has advantages such as clean combustion, low price, diverse production methods, no limitation by petroleum resources, and convenient storage and transportation, the use of alternative fuels in heavy-duty internal combustion engines has attracted attention in recent years, and ammonia engines have been launched one after another.

[0003] Currently, the development of ammonia-diesel dual-fuel engines uses diesel as ignition and ammonia as the main fuel, employing a single-point intake manifold injection technology for ammonia. This technology is relatively mature and easy to control. However, due to the low volumetric calorific value of ammonia, the single-point injection method using gaseous ammonia consumes air intake, limiting the ammonia substitution rate to approximately 50%. This significantly impacts the improvement of engine emissions and fuel economy. For example, CN104541049B discloses a valve assembly and injection valve for injection valves. While the armature pushes the valve needle to control the opening and closing of the injection nozzle, placing the inlet at the tail end of the injection valve and using the internal through-hole of the valve needle as the liquid passage not only reduces the strength of the valve needle but also causes significant damage to the internal components of the injection valve when the injected liquid is corrosive, such as ammonia, thus reducing the valve's lifespan. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a liquid ammonia nozzle for multi-point electronically controlled injection in the air intake.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a liquid ammonia nozzle for multi-point electronically controlled injection in an air intake, comprising a valve body and an electrode shoe; the valve body has a circular through hole machined in its center, one end of the valve body is welded to the outer wall of the electrode shoe, and several air inlets are machined along its circumference in the middle of the valve body, communicating with the through hole inside; a valve seat is fixedly installed in the other end of the valve body, and an air outlet channel is machined in the valve seat; a coil assembly is fixedly wrapped around the outside of the electrode shoe, and an armature assembly is also installed in the adjusting pad; one end of the armature assembly is adjacent to the coil assembly and a spring is provided between the armature assembly and the coil assembly, and the other end of the armature assembly extends into the valve seat to control the opening and closing of the air outlet channel.

[0007] The armature assembly includes an armature with a through hole machined inside. A valve stem is fixedly installed at one end of the through hole by means of a constriction, and a valve core is machined at the other end of the valve stem.

[0008] The outer wall of one end of the armature has the same diameter as the circular through hole in the valve body, while the other end has a smaller diameter and is machined with several radial holes that connect to the through hole inside.

[0009] Spring grooves are machined on the opposite surfaces of the armature and pole shoe.

[0010] The air outlet channel is a stepped hole, and the stepped surface is a conical surface.

[0011] The valve body has a step machined inside the end where the valve seat is installed. A limit block, an adjusting pad, a guide seat, and the valve seat are installed in sequence on the step, and the valve seat is fixed by closing the opening of the valve body.

[0012] An inner sealing ring is also installed between the valve seat and the valve body.

[0013] Two sealing grooves are also machined on the outer wall of the valve body on both sides of the air inlet.

[0014] The valve body also has external threads machined on the right end.

[0015] The coil assembly is encapsulated in plastic, and the outer shell has a wire insertion hole. A connector is installed in the wire insertion hole to connect with the coil assembly. The end of the pole shoe is also encapsulated in a threaded hole, and a fixing screw is installed in the threaded hole. An elastic pad is provided between the fixing screw and the coil assembly, and the edge of the elastic pad contacts the encapsulated shell.

[0016] The beneficial effects of this utility model are as follows:

[0017] Injecting fuel in a liquid column form can occupy less air intake space and increase the utilization rate of ammonia without reducing engine power; the nozzle adopts a unique side-inlet and end-inlet layout, which is beneficial for the nozzle layout on the inlet pipe; the nozzle adopts a metal needle valve structure and the moving parts adopt a low inertia design, which improves the control accuracy and service life of the nozzle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the armature assembly structure of this utility model;

[0020] In the diagram: 1-valve seat, 2-adjusting pad, 3-limiting block, 4-valve body, 5-armature assembly, 6-spring, 7-coil assembly, 8-pole shoe, 9-elastic pad, 10-insertion hole, 11-inner sealing ring, 12-valve stem, 13-air inlet, 14-outer sealing ring, 15-fixing screw, 16-valve core, 17-armature, 18-guide seat, 19-external thread. Detailed Implementation

[0021] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0022] like Figure 1 As shown, a liquid ammonia nozzle for multi-point electrically controlled injection in the intake duct includes a valve body 4 and an electrode shoe 8. The valve body 4 has a circular through-hole machined in its center. One end of the valve body 4 is welded to the outer wall of the electrode shoe 8. Several air inlets 13 are machined along the circumference of the valve body 4, communicating with the through-hole. A valve seat 1 is fixedly installed inside the other end of the valve body 4, and an outlet channel is machined inside the valve seat 1. A coil assembly 7 is fixedly wrapped around the electrode shoe 8. An armature assembly 5 is also installed inside the adjusting pad 2. One end of the armature assembly 5 is adjacent to the electrode shoe 8 and a spring 6 is provided between them. The other end of the armature assembly 5 extends into the valve seat 1 to control the opening and closing of the outlet channel. When the coil assembly is energized, it generates electromagnetic force. Under the action of electromagnetic force, the armature assembly overcomes the inlet pressure and spring force to move to the right. When the valve core in the armature assembly contacts the limit block, it stops moving. At this time, the solenoid valve opens, and the medium flows from the inlet to the outlet. Figure 1 As shown, when the coil assembly loses power, the valve core moves to the left and comes into contact with the valve seat under the action of inlet pressure and spring force, at which point the solenoid valve closes.

[0023] Furthermore, the armature assembly 5 includes an armature 17, which has a through hole machined inside. One end of the through hole is fixedly mounted with a valve stem 12 by a tapering method, and the other end of the valve stem 12 is machined with a valve core 16. By fixing the valve stem inside the armature by tapering, it is possible to prevent the valve stem from loosening due to impact during opening and closing.

[0024] Furthermore, the outer wall of one end of the armature 17 has the same diameter as the circular through hole inside the valve body 4, while the other end has a reduced diameter and is machined with several radial holes that connect to the through hole inside. The radial holes and through holes inside the armature create an air passage between the outer end of the armature and the pole shoe, preventing the liquid ammonia from exerting excessive pressure on the armature during air intake, which would otherwise prevent the spring from pushing the armature away from the pole shoe or increase the strength requirements of the spring, thus increasing the cost of the injection valve.

[0025] Furthermore, to ensure that the spring does not slip between the armature and the pole shoe, spring grooves are machined on the opposite surfaces of the armature 17 and the pole shoe 8.

[0026] Furthermore, the air outlet channel is a stepped hole, the stepped surface is a conical surface and fits against the side of the valve core 16 in order to ensure the shut-off effect of the channel.

[0027] Furthermore, a step is machined inside the end of the valve body 4 where the valve seat 1 is installed. A limit block 3, an adjusting shim 2, a guide seat 18, and the valve seat 1 are installed sequentially on the step. The valve seat 1 is fixed by closing the opening of the valve body 4, which simplifies the assembly process of the valve seat. By placing different adjusting shims, the valve opening L can be precisely controlled.

[0028] Furthermore, an inner sealing ring 11 is installed between the valve seat 1 and the valve body 4 to prevent liquid ammonia from leaking out of the valve seat.

[0029] Furthermore, in order to ensure the sealing effect between the injection valve and the equipment, two sealing grooves are also machined on the outer wall of the valve body 4 on both sides of the air inlet 13.

[0030] Furthermore, to facilitate the installation of the injection valve, external threads are machined on the right end of the valve body 4.

[0031] Furthermore, the coil assembly 7 is encased in a plastic shell, with a wiring hole 10 on the shell. A connector is installed inside the wiring hole 10 to connect to the coil assembly 7. The end of the pole shoe 8 is also machined with a threaded hole, into which a fixing screw 15 is fitted. An elastic washer 9 is placed between the fixing screw 15 and the coil assembly 7, with the edge of the elastic washer 9 contacting the plastic shell. The coil is fixed to the pole shoe by screws, allowing for easy separation between the coil and the valve body. This facilitates the maintenance of the injection valve.

Claims

1. A liquid ammonia nozzle for multi-point electronically controlled injection in an air intake duct, comprising a valve body (4) and an electrode shoe (8), characterized in that: The valve body (4) has a circular through hole in the center. One end of the valve body (4) is welded to the outer wall of the pole shoe (8). Several air inlets (13) are machined along the circumference of the middle part of the valve body (4) and communicate with the through hole inside. A valve seat (1) is fixedly installed inside the other end of the valve body (4). An air outlet channel is machined inside the valve seat (1). A coil assembly (7) is fixedly wrapped around the outside of the pole shoe (8). An armature assembly (5) is also installed inside the adjusting pad (2). One end of the armature assembly (5) is adjacent to the coil assembly (7) and a spring (6) is provided between the armature assembly (7) and the coil assembly (7). The other end of the armature assembly (5) extends into the valve seat (1) to control the opening and closing of the air outlet channel.

2. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct as described in claim 1, characterized in that: The armature assembly (5) includes an armature (17), a through hole is machined in the armature (17), a valve stem (12) is fixedly installed at one end of the through hole by means of a constriction, and a valve core (16) is machined at the other end of the valve stem (12).

3. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct as described in claim 2, characterized in that: The outer wall of one end of the armature (17) has the same diameter as the circular through hole in the valve body (4), while the diameter of the other end is reduced and several radial holes are machined to connect with the through hole inside.

4. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct as described in claim 3, characterized in that: Spring grooves are machined on the opposite surfaces of the armature (17) and the pole shoe (8).

5. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct as described in claim 1, characterized in that: The air outlet channel is a stepped hole, and the stepped surface is a conical surface.

6. The liquid ammonia nozzle for multi-point electronically controlled injection in the intake duct as described in claim 1, characterized in that: The valve body (4) has a step machined inside one end where the valve seat (1) is installed. A limit block (3), an adjusting pad (2), a guide seat (18), and the valve seat (1) are installed on the step in sequence. The valve seat (1) is fixed by closing the opening of the valve body (4).

7. The liquid ammonia nozzle for multi-point electronically controlled injection in the intake duct as described in claim 6, characterized in that: An inner sealing ring (11) is also installed between the valve seat (1) and the valve body (4).

8. The liquid ammonia nozzle for multi-point electronically controlled injection in the intake duct as described in claim 7, characterized in that: Two sealing grooves are also machined on the outer wall of the valve body (4) on both sides of the air inlet (13).

9. The liquid ammonia nozzle for multi-point electronically controlled injection in the intake duct as described in claim 1, characterized in that: The valve body (4) also has external threads machined on the right end.

10. The liquid ammonia nozzle for multi-point electronically controlled injection in the intake duct as described in claim 1, characterized in that: The coil assembly (7) is encapsulated in plastic. The outer shell has a wire insertion hole (10) and a connector is provided in the wire insertion hole (10) to connect to the coil assembly (7). The end of the pole shoe (8) is also encapsulated in threaded hole. A fixing screw (15) is installed in the threaded hole. An elastic pad (9) is provided between the fixing screw (15) and the coil assembly (7). The edge of the elastic pad (9) is in contact with the plastic shell.

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