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

Abstract

The invention provides a liquid ammonia nozzle for multi-point electric control injection of a gas 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] The present invention relates to a liquid ammonia nozzle for multi-point electronic control injection in an intake passage of an internal combustion engine. Background Art

[0002] Due to the advantages of ammonia such as clean combustion, low price, diverse production routes, no restriction by petroleum resources, and convenient storage and transportation, the use of alternative fuels in heavy-duty internal combustion engines has attracted people's attention in recent years, and ammonia engines have been successively introduced.

[0003] Currently, for the development of ammonia-diesel dual-fuel engines, a dual-fuel mode with diesel as the pilot fuel and ammonia as the main fuel is adopted. The ammonia used adopts a single-point intake passage manifold injection technology, which is relatively mature and easy to control. However, due to the relatively low volumetric calorific value of ammonia, the single-point injection of ammonia gas in the intake passage manifold occupies the air intake volume, resulting in a not-too-high ammonia substitution rate. Currently, it is only about 50%, which seriously affects the improvement of the engine's emission index and the improvement of economy. For example, the valve assembly and injection valve for an injection valve disclosed in CN104541049B control the opening and closing of the injection nozzle by pushing a valve needle with an armature. However, its inlet is set at the end of the injection valve, and the through hole inside the valve needle is used as the liquid passage, which not only reduces the strength of the valve needle, but also causes greater damage to the inside of the injection valve when the injected liquid is a corrosive liquid such as ammonia liquid, reducing the service life of the injection valve. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a liquid ammonia nozzle for multi-point electronic control injection in an intake passage.

[0005] The present invention is achieved through the following technical solutions.

[0006] A liquid ammonia nozzle for multi-point electronic control injection in an intake passage provided by the present invention includes a valve body and a pole shoe; a circular 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, several air inlets are machined in the middle of the valve body along its circumferential direction and are communicated with the through hole inside it, a valve seat is fixedly installed inside 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, and an armature assembly is further installed inside the adjusting pad. One end of the armature assembly is adjacent to the coil assembly and a spring is provided between them. 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. A through hole is machined in the armature. One end of the through hole is fixedly installed with a valve rod by means of necking, and the other end of the valve rod is machined with a valve core.

[0008] The diameter of the outer wall of one end of the armature is the same as the diameter of the circular through hole inside the valve body, and the diameter of the other end is reduced and several radial holes are machined and connected to the through hole inside it.

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

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

[0011] A step is machined inside one end of the valve body where the valve seat is installed. A limit block, an adjusting pad, a guide seat, and a valve seat are sequentially installed 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] External threads are also machined at the right end of the valve body.

[0015] A plastic-sealed housing is machined outside the coil assembly. A wire insertion hole is provided on the housing, and a connector is provided inside the wire insertion hole to connect with the coil assembly; a threaded hole is also machined at the end of the pole shoe, a fixing screw is assembled 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 plastic-sealed housing.

[0016] The beneficial effects of the present invention are as follows:

[0017] Fuel can be sprayed in a liquid column form, which can occupy a smaller intake space of air and improve the utilization rate of ammonia without reducing the engine power; the nozzle adopts a unique layout method of side inlet and end spraying, which is beneficial to the layout of the nozzle 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 is a schematic diagram of the armature assembly structure of the present invention;

[0020] In the figure: 1-valve seat, 2-adjusting pad, 3-limit block, 4-valve body, 5-armature assembly, 6-spring, 7-coil assembly, 8-pole shoe, 9-elastic pad, 10-wire insertion hole, 11-inner sealing ring, 12-valve rod, 13-air inlet, 14-outer sealing ring, 15-fixing screw, 16-valve core, 17-armature, 18-guide seat, 19-external thread. DETAILED DESCRIPTION OF THE INVENTION

[0021] The technical solution of the present invention will be further described below, but the scope of protection claimed is not limited thereto.

[0022] AsFigure 1 As shown in the figure, a liquid ammonia nozzle for multi-point electronic control injection of an intake duct includes a valve body 4 and a pole shoe 8. A circular through-hole is machined in the center of the valve body 4. One end of the valve body 4 is welded to the outer wall of the pole shoe 8. A plurality of air inlets 13 are machined in the middle of the valve body 4 along its circumferential direction and are communicated with the through-hole inside. A valve seat 1 is fixedly installed inside the other end of the valve body 4, and an air outlet channel is machined in the valve seat 1. A coil assembly 7 is fixedly wrapped outside the pole shoe 8. An armature assembly 5 is further installed inside the adjusting pad 2. One end of the armature assembly 5 is adjacent to the pole shoe 8, and a spring 6 is arranged between the armature assembly 5 and the pole shoe 8. 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. When the coil assembly is energized, an electromagnetic force is generated. Under the action of the electromagnetic force, the armature assembly moves to the right, overcoming the inlet pressure and the spring force. 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. As Figure 1 shown in the figure, when the coil assembly is de-energized, the valve core moves to the left under the action of the inlet pressure and the spring force and presses tightly against the valve seat. At this time, the solenoid valve closes.

[0023] Furthermore, the armature assembly 5 includes an armature 17. A through-hole is machined in the armature 17. One end of the through-hole is fixedly installed with a valve rod 12 by means of necking. The other end of the valve rod 12 is machined with a valve core 16. Fixing the valve rod in the armature by means of necking can prevent the valve rod from loosening due to impact during the opening and closing processes.

[0024] Furthermore, the diameter of one end outer wall of the armature 17 is the same as the diameter of the circular through-hole inside the valve body 4, and the diameter of the other end is reduced and is machined with a plurality of radial holes connected to the through-hole inside. The radial holes on the inner part of the armature and the through-hole inside form an air passage between the outer end of the armature and the pole shoe, avoiding a great pressure on the armature by liquid ammonia during the air intake process, which may cause the spring to be unable to push the armature away from the pole shoe, or increase the strength requirement of the spring, resulting in an increase in the cost of the injection valve.

[0025] Furthermore, in order to ensure that the spring does not slide 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, and the stepped surface is a conical surface and fits with the side surface of the valve core 16 to ensure the cut-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 pad 2, a guide seat 18, and the valve seat 1 are sequentially installed on the step and the valve seat 1 is fixed by necking the opening of the valve body 4, making the assembly process of the valve seat simpler. And by placing different adjusting gaskets, the opening degree L of the valve can be accurately controlled.

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

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

[0030] Further, to facilitate the installation of the injection valve, an external thread is also machined at the end of the right end of the valve body 4.

[0031] Further, a plastic-sealed housing is machined on the outside of the coil assembly 7. A wire insertion hole 10 is provided on the housing. A connector is provided in the wire insertion hole 10 and is connected to the coil assembly 7; a threaded hole is also machined at the end of the pole shoe 8. A fixing screw 15 is assembled 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 contacts the plastic-sealed housing. The coil is fixed to the pole shoe by screws, so that the coil and the valve body can be easily separated. This facilitates the maintenance of the injection valve.

Claims

1. A liquid ammonia nozzle for multi-point electronically controlled injection in an intake duct, comprising a valve body (4) and a pole shoe (8), characterized in that: A circular through hole is machined at the center of the valve body (4); one end of the valve body (4) is welded to the outer wall of the pole shoe (8); a plurality of air inlets (13) are machined in the middle of the valve body (4) along its circumferential direction and are connected to the through hole therein; a valve seat (1) is fixedly installed at the other end of the valve body (4); an air outlet passage is machined inside the valve seat (1); a coil assembly (7) is fixedly wrapped outside the pole shoe (8); an armature assembly (5) is also installed inside the adjustment 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 (5) and the coil assembly (7); the other end of the armature assembly (5) extends into the valve seat (1) to control the passage of the air outlet passage.

2. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct according to claim 1, characterized in that: The armature assembly (5) comprises an armature (17), a through hole is machined in the armature (17), a valve stem (12) is fixedly mounted on one end of the through hole by closing, and a valve core (16) is machined on the other end of the valve stem (12).

3. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct according to 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 other end has a reduced diameter and is processed with a plurality of radial holes connected to the through hole in the armature (17).

4. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct according to claim 3, characterized in that: Spring grooves are processed on the opposing 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 according to claim 1, characterized in that: The air outlet channel is a step hole, and the step surface is a conical surface.

6. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct according to claim 1, characterized in that: A step is machined inside one end of the valve body (4) on which the valve seat (1) is mounted, and a limit block (3), an adjustment pad (2), a guide seat (18), and a valve seat (1) are sequentially mounted on the step, and 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 air intake duct according to 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 air intake duct according to claim 7, characterized in that: The outer wall of the valve body (4) is also processed with two sealing grooves on both sides of the air inlet (13).

9. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct according to claim 1, characterized in that: The right end of the valve body (4) is also processed with an external thread.

10. The liquid ammonia nozzle for multi-point electronically controlled injection in the air intake duct according to claim 1, characterized in that: The coil assembly (7) is processed with a plastic-encapsulated shell on the outside, and a wire insertion hole (10) is provided on the shell. A connector is provided in the wire insertion hole (10) and connected to the coil assembly (7); a threaded hole is also processed at the end of the pole shoe (8), and 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), and the edge of the elastic pad (9) is in contact with the plastic-encapsulated shell.

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