An electronically controlled fuel injector with isolation

Abstract

The present application aims to design an electric control injector with fuel isolation function. The electric control injector with fuel isolation function comprises: an injector body, a metering orifice plate, an intermediate piece and a needle valve pair arranged in sequence; a control cavity is formed on the metering orifice plate for the high-pressure fuel from outside to enter; a fuel holding cavity is formed on the needle valve pair for new energy fuel to enter; a control unit and a fuel isolation unit are arranged in the injector body, the metering orifice plate and the intermediate piece; the fuel isolation unit partially penetrates through the intermediate piece and abuts against the needle valve pair; the fuel pressure in the control cavity is partially discharged by the control unit to adjust the pressure on the needle valve pair, so as to realize the opening and closing control of the needle valve pair; the new energy fuel entering the fuel holding cavity is isolated from the control unit by the fuel isolation unit.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of internal combustion engines, and particularly relates to an electric control injector for isolating fuel. BACKGROUND

[0002] With the response to low-carbon, carbon-free and green energy strategies around the world, new energy fuels are rising, but most new energy fuels, such as methanol and ammonia, are corrosive. As an important type of fuel injector, the electric control injector is crucial in the face of corrosive fuel challenges. The fuel corrosion affects the material of the fuel injector, especially the electromagnetic valve assembly of the electric control injector, such as the armature, sealing glue, etc., which is easy to be corroded by new energy fuels such as methanol. At present, there is a lack of materials with good electromagnetic performance and corrosion resistance. In order to solve this problem, it is crucial to develop an electric control injector with fuel isolation function. The development of an electric control injector with effective fuel isolation not only improves the service life of the electric control injector, but also further promotes the application of green energy.

[0003] Therefore, it is necessary to develop an electric control injector with fuel isolation function. SUMMARY

[0004] The purpose of the application is to design an electric control injector with fuel isolation function.

[0005] The technical scheme of the application is as follows:

[0006] The application provides an electric control injector for isolating fuel, which comprises, in sequence, an injector body, a metering orifice plate, an intermediate piece and a needle valve pair.

[0007] A control cavity for external high-pressure fuel to enter is formed on the metering orifice plate;

[0008] A fuel containing cavity for new energy fuel to enter is formed on the needle valve pair;

[0009] A control unit and a fuel isolation unit are arranged in the injector body, the metering orifice plate and the intermediate piece; the fuel isolation unit partially penetrates through the intermediate piece and abuts against the needle valve pair;

[0010] The control unit is relied on to prevent or allow the fuel pressure in the control cavity to partially leak, so as to adjust the pressure received by the needle valve pair and realize the opening and closing control of the needle valve pair;

[0011] The fuel isolation unit is relied on to isolate the new energy fuel entering the fuel containing cavity from the control unit.

[0012] Preferably, an oil inlet channel is formed on the injector body and the metering orifice plate and communicates with the control cavity;

[0013] The injector body and the orifice plate are formed with a control oil return channel;

[0014] When the control unit is open, the control cavity communicates with the control oil return channel;

[0015] When the control unit is closed, the control cavity does not communicate with the control oil return channel.

[0016] Preferably, the injector body, the orifice plate, the intermediate piece and the needle valve couple are formed with a fuel inlet channel communicating with the fuel holding cavity.

[0017] Preferably, the control unit comprises an electromagnetic valve assembly and a control valve assembly installed in the injector body and the orifice plate;

[0018] When the electromagnetic valve assembly is energized, the control valve assembly is driven to move, so that the oil outlet of the control cavity communicates with the control oil return channel, the high-pressure fuel pressure in the control cavity is partially released, and the pressure on the end of the needle valve couple abutting against the fuel isolation unit gradually decreases; when the pressure on the end of the needle valve couple abutting against the fuel isolation unit is lower than the fuel pressure in the fuel holding cavity in the needle valve couple, the needle valve couple is open.

[0019] When the electromagnetic valve assembly is de-energized, the control valve assembly gradually returns to the original position, so that the oil outlet of the control cavity no longer communicates with the control oil return channel, and the needle valve couple is closed.

[0020] Preferably, the pressure on the end of the needle valve couple abutting against the fuel isolation unit includes the pre-tightening force of the needle valve couple itself and the high-pressure fuel pressure in the control cavity.

[0021] Preferably, the electromagnetic valve assembly comprises:

[0022] An electromagnetic valve installed in the injector body, the pre-tightening force of which is adjusted by an electromagnetic valve spring installed in the injector body;

[0023] An armature spring installed in the electromagnetic valve;

[0024] An armature connected to the electromagnetic valve through an armature fixing screw, the pre-tightening force of which is adjusted by the armature spring;

[0025] An air gap adjusting washer installed between the electromagnetic valve and the control valve assembly;

[0026] The armature is fixedly connected to the control valve assembly through the armature fixing screw.

[0027] Preferably, the control valve assembly comprises:

[0028] A control valve core fixedly connected with the armature fixing screw in the injector body;

[0029] A guide body sleeved on the control valve core;

[0030] A valve seat fixedly connected with the control valve core;

[0031] A ball valve fixedly connected with the valve seat;

[0032] When the electromagnetic valve assembly is electrified, the control valve core, the valve seat and the ball valve are driven to move together under the guidance of the guide body, the oil return hole of the control cavity is communicated with the control oil return channel, and the fuel pressure in the control cavity is partially discharged outward through the control oil return channel;

[0033] When the electromagnetic valve assembly is de-energized, the control valve core, the valve seat and the ball valve are reset together under the guidance of the guide body, and the oil return hole of the control cavity and the control oil return channel are no longer communicated.

[0034] Preferably, the needle valve pair includes:

[0035] A needle valve body arranged below the intermediate piece;

[0036] A needle valve assembled in the needle valve body, and the needle valve body and the needle valve form the material containing cavity therebetween;

[0037] A control sleeve sleeved on the needle valve, the control sleeve abuts against the intermediate piece, and the needle valve can slide relative to the control sleeve;

[0038] A needle valve spring sleeved on the needle valve, the needle valve spring is limited between the control sleeve and the limiting portion of the needle valve;

[0039] The material containing cavity is a cavity formed by the needle valve body, the outer side of the control sleeve, the needle valve and the intermediate piece;

[0040] The injector body, the orifice plate, the intermediate piece and the needle valve body are formed with a material inlet channel communicated to the material containing cavity.

[0041] Preferably, the fuel isolation unit is a piston installed on the orifice plate and the intermediate piece;

[0042] The assembly outer diameter of the piston in the orifice plate is greater than the assembly outer diameter of the piston in the intermediate piece;

[0043] And the piston partially protrudes from the intermediate piece and abuts against the needle valve of the needle valve pair.

[0044] The beneficial effects of the present application are:

[0045] The needle valve is opened by controlling the oil pressure inside the control cavity, so as to effectively isolate the new energy fuel in the holding cavity from entering the control unit, and prevent the corrosion of the electromagnetic valve assembly in the control unit. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 A structure diagram of the fuel-isolated electric control injector in the embodiment of the present application;

[0047] Figure 2 A structure diagram of the fuel-isolated electric control injector in the embodiment of the present application;

[0048] Figure 3 A structure diagram of the fuel-isolated electric control injector in the embodiment of the present application;

[0049] Figure 4 A structure diagram of the fuel-isolated electric control injector in the embodiment of the present application. DETAILED DESCRIPTION

[0050] As shown in Figure 1 — Figure 4 The present embodiment provides a fuel-isolated electric control injector for injecting new energy fuels such as ammonia and methanol. It comprises, in sequence, an injector body 24, an orifice plate 9, an intermediate piece 7 and a needle valve assembly.

[0051] A control cavity for the high-pressure fuel from outside to enter is formed on the orifice plate 9;

[0052] A holding cavity for the new energy fuel to enter is formed on the needle valve assembly;

[0053] A control unit and a fuel isolation unit are arranged in the injector body 24, the orifice plate 9 and the intermediate piece 7; the fuel isolation unit partially penetrates through the intermediate piece 7 and abuts against the needle valve assembly;

[0054] The control unit is relied on to prevent or allow the partial leakage of the fuel pressure in the control cavity, so as to adjust the pressure on the needle valve assembly and realize the opening and closing control of the needle valve assembly;

[0055] The fuel isolation unit is relied on to isolate the new energy fuel entering the holding cavity from the control unit.

[0056] In the present embodiment, the needle valve assembly, the intermediate piece 5, the orifice plate 9 and the injector body 24 are connected as a whole through the locking nut 3, the structure is compact, and the sealing pressure is provided for the sealing surface.

[0057] A sealing ring 23 for forming a seal when mounted on the electric control unit pump is arranged on the outer periphery of the injector body 24.

[0058] In the embodiment, the injector body 24 and the metering orifice plate 9 are formed with an oil inlet channel connected to the control cavity;

[0059] The injector body 24 and the metering orifice plate 9 are formed with a control oil return channel;

[0060] When the control unit is open, the control cavity is in communication with the control oil return channel;

[0061] When the control unit is closed, the control cavity is not in communication with the control oil return channel.

[0062] Meanwhile, the injector body 24, the metering orifice plate 9, the intermediate piece 7 and the needle valve pair are formed with a fuel inlet channel connected to the fuel cavity.

[0063] The electrically controlled injector has independent control oil channels and high-pressure fuel inlet channels, so that the electromagnetic valve related parts only contact with the control oil, avoiding the corrosion of new energy fuel to the electromagnetic valve.

[0064] The high-pressure fuel inlet channel is composed of a channel connected to the fuel interface 111. The oil inlet channel includes a flow channel connected to the control oil inlet 333 and the oil return port 222.

[0065] In the embodiment, the control unit includes an electromagnetic valve assembly and a control valve assembly installed in the injector body 24 and the metering orifice plate 9.

[0066] When the electromagnetic valve assembly is energized, it drives the control valve assembly to move, so that the oil outlet of the control cavity is in communication with the control oil return channel, the high-pressure fuel pressure in the control cavity is partially discharged, and the pressure on the end of the needle valve pair abutting against the fuel isolation unit gradually decreases; when the pressure on the end of the needle valve pair abutting against the fuel isolation unit is lower than the fuel pressure in the fuel cavity in the needle valve pair, the needle valve pair is opened.

[0067] When the electromagnetic valve assembly is de-energized, the control valve assembly gradually returns to its original position, so that the oil outlet of the control cavity is no longer in communication with the control oil return channel, and the needle valve pair is closed.

[0068] The pressure on the end of the needle valve pair abutting against the fuel isolation unit includes the pre-tightening force of the needle valve pair itself and the high-pressure fuel pressure in the control cavity. The opening pressure of the needle valve 2 is determined by the pre-tightening force of the needle valve gasket 4 and the control oil pressure in the control cavity.

[0069] In the embodiment, the fuel isolation unit is a piston 8 installed in the metering orifice plate 9 and the intermediate piece 8. The piston 8 is located between the metering orifice plate 9 and the intermediate piece 7, and the assembly outer diameter of the piston 8 in the metering orifice plate 9 is greater than that in the intermediate piece 7.

[0070] In this embodiment, the needle valve assembly includes a needle valve body 1 and a needle valve 2, the needle valve 2 moves up and down in the needle valve body 1, and the needle valve 2 can be opened and closed to realize the opening and closing of the oil injection nozzle.

[0071] The needle valve 2 is provided with a pressure adjusting washer 4 and a needle valve spring 5, and the needle valve 2 is provided with a downward spring pre-tightening force by the cooperation of the pressure adjusting washer 4, the needle valve spring 5 and a control sleeve 6, so that the injection hole is kept closed. The function of the intermediate part 7 is to limit the lift of the needle valve 2.

[0072] In order to enable the needle valve 2 to reset, the needle valve spring 5 is sleeved on the needle valve 2, and the needle valve spring 5 is limited between the control sleeve 6 and the limiting part of the needle valve 2.

[0073] In this embodiment, in order to realize the aforementioned electromagnetic valve assembly capable of driving the control valve assembly to move. The side of the injector body 24 facing the orifice plate 9 is provided with an assembly cavity, the injector body 24 is provided with an electromagnetic valve spring limiting cavity and a wire harness passage for connecting the electromagnetic valve wire harness to the external controller and power supply and other electrical appliances, the wire harness passage and the electromagnetic valve spring limiting cavity are communicated. The orifice plate 9 is provided with a drain cavity opposite to the assembly cavity, the drain cavity is communicated with the oil return hole of the control cavity, and the drain cavity is communicated with the aforementioned control oil return channel.

[0074] The control valve assembly is composed of a ball valve 10, a valve seat 11, a lift adjusting washer 13, a control valve core 12 and a guide body 14.

[0075] The electromagnetic valve assembly includes an electromagnetic valve 17, an air gap adjusting washer 15, an electromagnetic valve adjusting washer 21, an armature 16, an electromagnetic valve spring 22, an armature spring 19, an armature fixing screw 18 and an armature adjusting washer 20.

[0076] The electromagnetic valve 17 is arranged at the top of the assembly cavity, the top of the electromagnetic valve 17 is sleeved with the electromagnetic valve adjusting washer 21, the electromagnetic valve spring 22 is limited between the electromagnetic valve adjusting washer 21 and the top cavity wall of the electromagnetic valve spring limiting cavity, and the pre-tightening force of the electromagnetic valve spring 22 can be adjusted by adjusting the thickness of the electromagnetic valve adjusting washer 21.

[0077] The side of the electromagnetic valve 17 facing the control valve core 12 is provided with an armature spring mounting cavity, the armature adjusting washer 20 is arranged at the top of the armature spring mounting cavity, the head of the armature fixing screw 18 extends into the armature spring mounting cavity, and the armature spring 19 is limited between the armature adjusting washer 20 and the head of the armature fixing screw 18 in the armature spring mounting cavity.

[0078] The armature 16 arranged below the electromagnetic valve 17 is fixedly connected with the control valve core 12 arranged below it through the armature fixing screw 18.

[0079] The thickness of the armature adjusting gasket 20 is adjusted by adjusting the armature, and the pre-tightening force of the armature spring 17 is adjusted, so that the pre-tightening force of the armature spring 17 is changed to change the position of the armature 16 in the assembly cavity.

[0080] The guide body 14 is sleeved on the outer periphery of the control valve core 12 to limit the moving direction of the control valve core 12. The lift adjusting gasket 13 is arranged between the guide body 14 and the metering orifice plate 9, and the air gap adjusting gasket 15 is arranged between the guide body 14 and the electromagnetic valve 17.

[0081] One end of the control valve core 12 is connected to the valve seat 11, and the end of the valve seat 11 is connected to the ball valve 10. A part of the control valve core 12 is located in the assembly cavity, and the other end extends into the oil drain cavity together with the valve seat 11 and the ball valve 10, and a conical surface seal is formed between the ball valve 10 and the oil drain cavity.

[0082] In the embodiment, the working principle of the fuel-isolating electronically controlled injector is as follows:

[0083] As shown in Figure 1 Figure 4 The control oil enters the control chamber through the oil inlet of the oil inlet channel. At this time, since the electromagnetic valve 17 is not electrified, the valve seat 11 and the ball valve 10 are kept closed under the pre-tightening force of the armature spring 22. The control oil pressure is established in the control chamber, and the oil pressure presses the needle valve 2 through the piston 8.

[0084] When the electromagnetic valve 17 is electrified, the armature 16 is actuated to lift the control valve core 12, the conical surface seal between the ball valve 10 and the valve seat 11 is opened, and the control oil in the control chamber is quickly discharged through the control oil return channel. At this time, the pressure in the control chamber is reduced, but the new energy fuel in the fuel holding chamber still maintains a higher pressure than the fuel in the control chamber. When the fuel discharge of the electromagnetic valve 17 is carried out to the point that the lifting force of the fuel on the needle valve 2 is greater than the pre-tightening force of the needle valve 2 and the pressure of the control oil chamber, the needle valve 2 is unbalanced in the upward and downward forces, and the needle valve 2 is lifted together with the piston 8 under the lifting force of the new energy fuel in the fuel holding chamber. The needle valve 2 is opened, and the new energy fuel injection is started.

[0085] When the new energy fuel injection is completed, the external controller inputs an electronic control instruction to the electromagnetic valve assembly in the form of an electric signal. After the electromagnetic valve 17 is de-energized, the control valve assembly is gradually reset, the oil return hole of the control chamber and the control oil return channel are no longer connected, the fuel pressure in the control chamber is gradually increased, the upward and downward forces of the needle valve 2 are gradually balanced, and the needle valve 2 is reset and closed, thereby ending the new energy fuel injection.

[0086] The needle valve 2 is opened by the oil pressure in the control chamber, thereby effectively isolating the new energy fuel in the fuel holding chamber from entering the electromagnetic valve assembly and preventing the corrosion of the electromagnetic valve 17.

[0087] ​The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above embodiments, and any changes, modifications, substitutions, combinations, simplifications, etc. made without departing from the spirit and principles of the present application should be equivalent replacement manners and should be included in the protection scope of the present application.

Claims

1. An electrically controlled injector for isolating fuel, characterized by, The electrically controlled injector comprises, in sequence, an injector body, an orifice plate, an intermediate piece and a needle valve pair; A control cavity is formed on the orifice plate for the high-pressure fuel from outside to enter; A holding cavity is formed on the needle valve pair for the new energy fuel to enter; A control unit and a fuel isolation unit are arranged in the injector body, the orifice plate and the intermediate piece, and the fuel isolation unit partially penetrates through the intermediate piece and abuts against the needle valve pair; The control unit is used to prevent or allow the fuel pressure in the control cavity to partially leak out, so as to adjust the pressure on the needle valve pair and realize the opening and closing control of the needle valve pair; The fuel isolation unit is used to isolate the new energy fuel entering the holding cavity from the control unit.

2. An electrically controlled injector for isolating fuel according to claim 1, characterized in that, An oil inlet channel is formed on the injector body and the orifice plate and communicates with the control cavity; A control oil return channel is formed on the injector body and the orifice plate; When the control unit is opened, the control cavity communicates with the control oil return channel; When the control unit is closed, the control cavity does not communicate with the control oil return channel.

3. An electrically controlled injector for isolating fuel according to claim 1, characterized in that, An oil inlet channel is formed on the injector body, the orifice plate, the intermediate piece and the needle valve pair and communicates with the holding cavity.

4. An electrically controlled injector for isolating fuel according to claim 2, characterized in that, The control unit comprises an electromagnetic valve assembly and a control valve assembly installed in the injector body and the orifice plate; After the electromagnetic valve assembly is electrified, the control valve assembly is driven to move, so that the oil outlet of the control cavity communicates with the control oil return channel, the high-pressure fuel pressure in the control cavity partially leaks out, the pressure on the end of the needle valve pair abutting against the fuel isolation unit gradually decreases, and the needle valve pair is opened when the pressure on the end of the needle valve pair abutting against the fuel isolation unit is lower than the fuel pressure in the holding cavity of the needle valve pair; After the electromagnetic valve assembly is de-energized, the control valve assembly gradually returns to the original position, so that the oil outlet of the control cavity no longer communicates with the control oil return channel, and the needle valve pair is closed.

5. An electrically controlled injector for isolating fuel according to claim 4, characterized in that, The pressure on the end of the needle valve pair abutting against the fuel isolation unit includes the pre-tightening force of the needle valve pair itself and the high-pressure fuel pressure in the control cavity.

6. An electrically controlled injector for isolating fuel according to claim 4, characterized in that, The electromagnetic valve assembly comprises: An electromagnetic valve installed in the injector body, the pre-tightening force of which is adjusted by an electromagnetic valve spring installed in the injector body; An armature spring installed in the electromagnetic valve; An armature connected with the electromagnetic valve through an armature fixing screw, the pre-tightening force of which is adjusted by the armature spring; An air gap adjusting washer installed between the electromagnetic valve and the control valve assembly; The armature is fixedly connected with the control valve assembly through the armature fixing screw.

7. An electrically controlled injector for isolating fuel according to claim 6, characterized in that, The control valve assembly comprises: A control valve core fixedly connected with the armature fixing screw in the injector body; A guide body sleeved on the control valve core; A valve seat fixedly connected with the control valve core; A ball valve fixedly connected with the valve seat; When the electromagnetic valve assembly is electrified, the control spool, the valve seat and the ball valve are driven to move together under the guidance of the guide body, so as to connect the oil return hole of the control cavity with the control oil return channel, and the fuel pressure in the control cavity is partially discharged to the outside through the control oil return channel; When the electromagnetic valve assembly is de-energized, the control spool, the valve seat and the ball valve are reset together under the guidance of the guide body, and the oil return hole of the control cavity and the control oil return channel are no longer connected.

8. The electrically controlled injector for isolating fuel according to claim 1, characterized by, The needle valve assembly comprises: a needle valve body arranged below the intermediate piece; a needle valve assembled in the needle valve body, and a material containing cavity formed between the needle valve body and the needle valve; a control sleeve sleeved on the needle valve, the control sleeve abutting against the intermediate piece, and the needle valve being slidable relative to the control sleeve; a needle valve spring sleeved on the needle valve, the needle valve spring being limited between the control sleeve and the limiting portion of the needle valve; the material containing cavity being a cavity formed by the needle valve body, the outer side of the control sleeve, the needle valve and the intermediate piece; the injector body, the metering orifice plate, the intermediate piece and the needle valve body being provided with a material inlet channel communicated with the material containing cavity.

9. The electrically controlled injector for isolating fuel according to claim 1, characterized by, The fuel isolation unit is a piston mounted on the metering orifice plate and the intermediate piece; an assembly outer diameter of the piston in the metering orifice plate is greater than an assembly outer diameter of the piston in the intermediate piece; and the piston partially protrudes from the intermediate piece and abuts against the needle valve of the needle valve assembly.

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