A fuel injector and engine

Abstract

This invention relates to the field of automotive powertrain technology, specifically disclosing a fuel injector and engine. A first fuel enters the first fuel chamber through a first fuel inlet. When the electromagnet assembly is energized, it drives the sealing assembly to open the first oil outlet, causing a drop in oil pressure within the control chamber. Under the action of the oil pressure in the first fuel chamber, the needle valve opens the first fuel injection orifice, allowing the first fuel to enter the combustion chamber. A second fuel enters the injection chamber through a second fuel inlet. Control oil enters the pressure regulating chamber through the control oil inlet. Under the action of the oil pressure in the pressure regulating chamber, the valve core closes the second fuel injection orifice, regulating the inlet and outlet flow rates within the pressure regulating chamber. When the inlet flow rate is less than the outlet flow rate, the oil pressure in the pressure regulating chamber drops, and the valve core opens the second fuel injection orifice under the action of the oil pressure in the injection chamber, allowing the second fuel to enter the combustion chamber. This design enables independent control and injection of two different fuels, effectively improving engine economy, power, and emissions performance.

Description

Technical Field

[0001] This invention relates to the field of automotive powertrain technology, and more particularly to a fuel injector and engine. Background Technology

[0002] Fuel injectors are used to inject fuel directly into the cylinder or intake manifold under certain pressure. They are an important structural component of the engine fuel supply system, and their injection performance has a very important impact on engine performance.

[0003] To ensure sustainable energy development, the automotive industry is seeking alternative energy sources for vehicles. With increasing emphasis on environmental protection, the application of low-carbon and zero-carbon fuels in vehicles is becoming increasingly urgent. Natural gas and methanol, as alternative energy sources, are relatively inexpensive and easy to produce, with relatively environmentally friendly emissions. Hydrogen, as a zero-carbon fuel, does not contain greenhouse gases and has high energy density. Therefore, the flexible blending of various fuel types can further improve engine power, economy, and emissions performance. However, existing fuel injectors are not suitable for the independent control and injection of multiple fuels, resulting in poor flexibility and, to some extent, affecting engine power, economy, and emissions performance.

[0004] Therefore, there is an urgent need for a fuel injector and engine to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a fuel injector and engine that can achieve independent control and injection of two different fuels, effectively improving the engine's economy, power, and emission performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a fuel injector, comprising:

[0008] The injector body has a first fuel chamber along a first direction. The injector body includes an injection body and a valve body. The injection body is fixedly connected to the valve body. The injection body has a first fuel inlet. The valve body has a first fuel injection hole. The first fuel inlet and the first fuel injection hole are both connected to the first fuel chamber.

[0009] The valve sleeve has a control chamber, a first oil outlet passage and a first oil inlet passage, the first oil inlet passage connecting the first fuel chamber and the control chamber, and the first oil outlet passage connecting the control chamber and the first fuel chamber.

[0010] A sealing assembly and an electromagnet assembly, wherein the electromagnet assembly is configured to drive the sealing assembly to move such that the sealing assembly can open or close the first oil outlet passage;

[0011] A needle valve is disposed in the first fuel chamber, and one end of the needle valve is slidably engaged with the control chamber along the first direction, while the other end of the needle valve is used to close the first fuel injection hole.

[0012] The valve core has a cavity and a second fuel injection hole inside the valve body. One end of the valve core slides against the inner wall of the cavity to divide the cavity into a pressure regulating chamber and a fuel injection chamber. The injection body also has a second fuel inlet, a control oil inlet and a control oil outlet. The control oil inlet and the control oil outlet are both connected to the pressure regulating chamber. The fuel injection chamber is connected to the second fuel inlet and the second fuel injection hole. The other end of the valve core is used to close the second fuel injection hole.

[0013] As a preferred embodiment of the aforementioned fuel injector, the fuel injector further includes a transition block, an orifice plate, a sealing valve, a first elastic element, and a drive assembly. The injection body, the transition block, and the orifice plate are sequentially connected along the first direction. The orifice plate has a second oil inlet channel and a second oil outlet channel. The second oil inlet channel connects the control oil inlet and the pressure regulating chamber. The transition block has a first oil outlet chamber and a transition port. The second oil outlet channel connects the pressure regulating chamber and the first oil outlet chamber. The inner diameter of the second oil inlet channel is smaller than the inner diameter of the second oil outlet channel. The injection body has a second oil outlet chamber. The control oil outlet connects to the second oil outlet chamber. The transition port connects the first oil outlet chamber and the second oil outlet chamber. The sealing valve is disposed in the first oil outlet chamber. The first elastic element is configured to always have a tendency to drive the sealing valve to move towards the position of closing the transition port. The drive assembly is disposed in the second oil outlet chamber, and the drive assembly can drive the sealing valve to move so that the sealing valve can open the transition port.

[0014] As a preferred embodiment of the above-mentioned fuel injector, the fuel injector further includes a second elastic element disposed within the pressure regulating chamber, and the second elastic element is configured to always have a tendency to drive the valve core to move toward the position of closing the second fuel injection orifice.

[0015] As a preferred embodiment of the above-mentioned fuel injector, the fuel injector further includes a support base, the support base including a sliding part and a protrusion connected in sequence, the sliding part being placed in the pressure regulating chamber and slidably sleeved on the valve body, the protrusion abutting against the valve core, the second elastic member being sleeved on the sliding part, and the two ends of the second elastic member abutting against the orifice plate and the protrusion respectively.

[0016] As a preferred technical solution of the above-mentioned fuel injector, the drive assembly includes a piezoelectric crystal, a mounting base, a third elastic element, and a transmission block. The mounting base is fixedly installed on the inner wall of the second oil outlet chamber. The piezoelectric crystal is disposed in the second oil outlet chamber and fixedly connected to the mounting base. The two ends of the third elastic element abut against the transmission block and the transition block, respectively, so that the transmission block and the sealing valve are spaced apart along the first direction. The piezoelectric crystal is configured to drive the transmission block to abut against the sealing valve and open the transition port.

[0017] As a preferred technical solution for the aforementioned fuel injector, the third elastic element is a disc spring.

[0018] As a preferred technical solution of the above-mentioned fuel injector, the sealing assembly includes an armature, a sealing ball and a ball seat, the ball seat is fixedly connected to the armature, the ball seat has a ball socket, the sealing ball fits into the ball socket, and the electromagnet assembly is configured to drive the armature to move so that the sealing ball opens or closes the first oil outlet passage.

[0019] As a preferred technical solution for the aforementioned fuel injector, the sealing assembly further includes a valve seat having a guide channel extending through it, and the armature slidingly engaging with the inner wall of the guide channel.

[0020] As a preferred embodiment of the above-mentioned fuel injector, the central axis of the first fuel injection hole coincides with the central axis of the second fuel injection hole.

[0021] On the other hand, the present invention also provides an engine including a combustion chamber and a fuel injector as described in any of the above embodiments, wherein the first fuel injection port and the second fuel injection port are both connected to the combustion chamber.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention provides a fuel injector and an engine. The fuel injector includes: an injector body, a valve sleeve, a sealing assembly, an electromagnet assembly, a needle valve, a valve core, and a control mechanism. The injector body has a first fuel chamber along a first direction. The injector body includes an injection body and a valve body. The injection body is fixedly connected to the valve body and has a first fuel inlet. The valve body has a first fuel injection hole. Both the first fuel inlet and the first fuel injection hole are connected to the first fuel chamber. The valve sleeve has a control chamber, a first oil outlet passage, and a first oil inlet passage. The first oil inlet passage connects the first fuel chamber and the control chamber, and the first oil outlet passage connects the control chamber and the first fuel chamber. The electromagnet assembly... The component is configured to drive the sealing assembly to move so that the sealing assembly can open or close the first oil outlet passage. The needle valve is disposed in the first fuel chamber, and one end of the needle valve slides in the control chamber along the first direction. The other end of the needle valve is used to close the first fuel injection hole. The valve body has a cavity and a second fuel injection hole inside. One end of the valve core slides in the inner wall of the cavity to divide the cavity into a pressure regulating chamber and an injection chamber. The injection body also has a second fuel inlet, a control oil inlet and a control oil outlet. The control oil inlet and the control oil outlet are both connected to the pressure regulating chamber. The injection chamber is connected to the second fuel inlet and the second fuel injection hole. The other end of the valve core is used to close the second fuel injection hole. With this configuration, the first fuel enters the first fuel chamber through the first fuel inlet. The needle valve, under the pressure of the oil in the control chamber, closes the first fuel injection orifice. When the electromagnet assembly is energized, it drives the sealing assembly to open the first fuel outlet passage. At this time, the oil pressure in the control chamber drops, and the needle valve, under the pressure of the oil in the first fuel chamber, opens the first fuel injection orifice, allowing the first fuel to enter the combustion chamber through the first fuel injection orifice on the valve body. When the electromagnet assembly is de-energized, it drives the sealing assembly to close the first fuel outlet passage. At this time, the needle valve, under the pressure of the oil in the control chamber, closes the first fuel injection orifice, ending the injection process.

[0024] The second fuel enters the injection chamber through the second fuel inlet, while the control fuel enters the pressure regulating chamber through the control oil inlet. Under the pressure of the oil in the pressure regulating chamber, the valve core closes the second fuel injection orifice. Injection is achieved by regulating the inlet and outlet fuel flow rates within the pressure regulating chamber. When the inlet fuel flow rate is less than the outlet fuel flow rate, the oil pressure in the pressure regulating chamber decreases, and the valve core opens the second fuel injection orifice under the pressure of the oil in the injection chamber. The second fuel then enters the combustion chamber through the second fuel injection orifice on the valve body. This system enables independent control and injection of two different fuels; that is, the injection pressure, injection timing, and injection quantity of both fuels are independently and precisely controllable, effectively improving the engine's economy, power, and emissions performance. Attached Figure Description

[0025] Figure 1 A cross-sectional view of the fuel injector provided by the present invention;

[0026] Figure 2 A cross-sectional view of the support base provided by the present invention.

[0027] in:

[0028] 1. First fuel chamber;

[0029] 2. Injection body; 201. First fuel inlet; 202. Second fuel inlet; 203. Control oil inlet; 204. Control oil outlet;

[0030] 3. Valve body; 301. First fuel injection port; 302. Second fuel injection port;

[0031] 4. Valve sleeve; 41. Control chamber;

[0032] 5. Electromagnet assembly; 6. Needle valve; 7. Valve core; 8. Pressure regulating chamber; 9. Injection chamber; 10. Transition block;

[0033] 11. Orifice plate; 111. Second oil inlet passage; 112. Second oil outlet passage;

[0034] 12. Sealing valve; 13. First elastic element; 14. Second elastic element;

[0035] 15. Support base; 151. Sliding part; 152. Protrusion;

[0036] 16. Piezoelectric crystal; 17. Mounting base; 18. Third elastic element; 19. Transmission block; 20. Armature; 21. Sealing ball; 22. Ball seat; 23. Valve seat; 24. First fastener; 25. Second fastener; 26. Oil outlet; 27. Upper body. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0039] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0040] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 1 to 2As shown, this embodiment provides a fuel injector, which includes: an injector body, a valve sleeve 4, a sealing assembly, an electromagnet assembly 5, a needle valve 6, a valve core 7, and a control mechanism. The injector body has a first fuel chamber 1 along a first direction. The injector body includes an injection body 2 and a valve body 3. The injection body 2 is fixedly connected to the valve body 3 and has a first fuel inlet 201. The valve body 3 has a first fuel injection hole 301. Both the first fuel inlet 201 and the first fuel injection hole 301 are connected to the first fuel chamber 1. The valve sleeve 4 has a control chamber 41, a first oil outlet passage, and a first oil inlet passage. The first oil inlet passage connects the first fuel chamber 1 and the control chamber 41, and the first oil outlet passage connects the control chamber 41 and the first fuel chamber 1. The electromagnet assembly 5 is configured to drive the sealing assembly to move, so that the sealing assembly... The component can open or close the first oil outlet passage. The needle valve 6 is located in the first fuel chamber 1, and one end of the needle valve 6 slides in cooperation with the control chamber 41 in the first direction. The other end of the needle valve 6 is used to close the first fuel injection hole 301 and form a conical sealing pair. The valve body 3 has a cavity and a second fuel injection hole 302 inside. One end of the valve core 7 slides in cooperation with the inner wall of the cavity to divide the cavity into a pressure regulating chamber 8 and an oil injection chamber 9. The injection body 2 also has a second fuel inlet 202, a control oil inlet 203, a control oil outlet 204 and an oil outlet path 26. The control oil inlet 203 and the control oil outlet 204 are both connected to the pressure regulating chamber 8. The oil injection chamber 9 is connected to the second fuel inlet 202 and the second fuel injection hole 302. The other end of the valve core 7 is used to close the second fuel injection hole 302. The oil outlet path 26 is connected to the first fuel chamber 1. With this configuration, the first fuel enters the first fuel chamber 1 through the first fuel inlet 201. The needle valve 6 closes the first fuel injection orifice 301 under the action of the oil pressure in the control chamber 41. When the electromagnet assembly 5 is energized, it drives the sealing assembly to open the first oil outlet passage. At this time, the oil pressure in the control chamber 41 drops, and the needle valve 6 opens the first fuel injection orifice 301 under the action of the oil pressure in the first fuel chamber 1. The first fuel enters the combustion chamber through the first fuel injection orifice 301 on the valve body 3. When the electromagnet assembly 5 is de-energized, it drives the sealing assembly to close the first oil outlet passage. At this time, the needle valve 6 closes the first fuel injection orifice 301 under the action of the oil pressure in the control chamber 41, and the injection ends.

[0043] The second fuel enters the injection chamber 9 through the second fuel inlet 202. Control oil enters the pressure regulating chamber 8 through the control oil inlet 203. The control oil pressure is slightly higher than the second fuel pressure. Under the pressure of the oil in the pressure regulating chamber 8, the valve core 7 closes the second fuel injection orifice 302. Injection is completed by regulating the inlet and outlet flow rates in the pressure regulating chamber 8. When the inlet flow rate is less than the outlet flow rate, the oil pressure in the pressure regulating chamber 8 drops, and the valve core 7 opens the second fuel injection orifice 302 under the pressure of the oil in the injection chamber 9. The second fuel then enters the combustion chamber through the second fuel injection orifice 302 on the valve body 3. This system enables independent control and injection of two different fuels; that is, the injection pressure, injection timing, and injection quantity of both fuels are independently and precisely controllable, effectively improving the engine's economy, power, and emissions performance.

[0044] Furthermore, the first fuel is a highly flammable fuel such as diesel, and the second fuel is a low-carbon or zero-carbon fuel such as methane, methanol, or hydrogen. It should be noted that the number and diameter of the first fuel injection orifice 301 and the second fuel injection orifice 302 can be reasonably set according to the actual needs of the engine to adaptively adjust the injection cross-sectional area of ​​the two fuels. To achieve better combustion organization, the number of the first fuel injection orifice 301 and the second fuel injection orifice 302 is generally equal, and the first and second directions are respectively as shown in the diagram. Figure 1 The two arrows in the image indicate the direction.

[0045] In this embodiment, the valve core 7 is annular, and the outer cylindrical surface and the inner cylindrical surface of the valve core 7 form a tight mating surface with the cylindrical surface of the valve body 3, with a radial clearance of 0.004mm-0.006mm.

[0046] Specifically, this embodiment provides the following exemplary solution: the fuel injector further includes a transition block 10, an orifice plate 11, a sealing valve 12, a first elastic element 13, a second elastic element 14, a drive assembly, and a first fastener 24. The injection body 2, the transition block 10, and the orifice plate 11 are sequentially connected along a first direction via the first fastener 24. The orifice plate 11 has a second oil inlet channel 111 and a second oil outlet channel 112. The second oil inlet channel 111 connects to the control oil inlet 203 and the pressure regulating chamber 8. The transition block 10 has a first oil outlet chamber and a transition port. The second oil outlet channel 111... The pressure regulating chamber 8 and the first oil outlet chamber are connected. The inner diameter of the second oil inlet passage 111 is smaller than the inner diameter of the second oil outlet passage 112. The injection body 2 has a second oil outlet chamber. The control oil outlet 204 is connected to the second oil outlet chamber. The transition port is connected to the first oil outlet chamber and the second oil outlet chamber. The sealing valve 12 is disposed in the first oil outlet chamber. The first elastic member 13 is configured to always have the tendency to drive the sealing valve 12 to move towards the closed transition port position. The drive assembly is disposed in the second oil outlet chamber and can drive the sealing valve 12 to move so that the sealing valve 12 can open the transition port. The second elastic member 14 is disposed in the pressure regulating chamber 8 and is configured to always have the tendency to drive the valve core 7 to move towards the closed second fuel injection hole 302 position. Specifically, both the first elastic member 13 and the second elastic member 14 are compression springs.

[0047] With this configuration, the valve core 7, under the action of the oil pressure in the pressure regulating chamber 8 and the pre-tightening force of the second elastic element 14, closes the second fuel injection hole 302. The drive assembly is activated to drive the sealing valve 12 to move, thereby opening the transition port. At this time, the control oil in the pressure regulating chamber 8 can enter the control oil outlet 204 through the second oil outlet 112 and return to the low-pressure oil circuit to the oil tank. Since the flow rate of the second oil inlet 111 is less than the flow rate of the second oil outlet 112, when the transition port is opened, the inflow and outflow of control oil in the pressure regulating chamber 8 is less than the outflow, and the pressure in the pressure regulating chamber 8 decreases. When the pressure in the pressure regulating chamber 8 decreases to a certain level, the valve core 7, under the action of the oil pressure in the injection chamber 9, overcomes the oil pressure in the pressure regulating chamber 8 and the pre-tightening force of the second elastic element 14, thereby opening the second fuel injection hole 302 and realizing injection.

[0048] Optionally, in order to ensure the stability of the elastic force direction of the second elastic element 14 and to prevent the second elastic element 14 from tilting during elastic deformation to a certain extent, the fuel injector also includes a support seat 15. The support seat 15 includes a sliding part 151 and a protrusion 152 connected in sequence. The sliding part 151 is placed in the pressure regulating chamber 8 and is slidably sleeved on the valve body 3. The protrusion 152 abuts against the valve core 7. The second elastic element 14 is sleeved on the sliding part 151, and the two ends of the second elastic element 14 abut against the orifice plate 11 and the protrusion 152, respectively.

[0049] It should be noted that by adjusting the total height of the support base 15, the movement distance of the valve core 7 along the first direction can be adjusted, that is, the movement stroke of the valve core 7 can be adjusted. By adjusting the height of the protrusion 152, the preload of the valve core 7 in the initial state can be adjusted.

[0050] In this embodiment, the drive assembly includes a piezoelectric crystal 16, a mounting base 17, a third elastic element 18, and a transmission block 19. The mounting base 17 is fixedly installed on the inner wall of the second oil outlet chamber. The piezoelectric crystal 16 is disposed in the second oil outlet chamber and fixedly connected to the mounting base 17. The two ends of the third elastic element 18 abut against the transmission block 19 and the transition block 10, respectively, so that the transmission block 19 and the sealing valve 12 are spaced apart along the first direction. The piezoelectric crystal 16 is configured to drive the transmission block 19 to abut against the sealing valve 12 and open the transition port. Specifically, the third elastic element 18 is a disc spring. With this configuration, the piezoelectric crystal 16 indirectly controls the injection of the second fuel by controlling the pressure of the control oil in the pressure regulating chamber 8. When a certain voltage is applied to the piezoelectric crystal 16, the piezoelectric crystal 16 produces a certain longitudinal deformation, which pushes the transmission block 19 to overcome the force of the third elastic element 18 and move in the first direction. When the transmission block 19 contacts the sealing valve 12, it pushes the sealing valve 12 to move in the first direction, and the transition port is opened. At this time, the control oil in the pressure regulating chamber 8 begins to flow out through the second oil outlet 112, thereby realizing the subsequent regulation of the oil pressure in the pressure regulating chamber 8 to complete the injection of the second fuel.

[0051] When the piezoelectric crystal 16 is de-energized, under the force of the third elastic element 18, the transmission block 19 disengages from the sealing valve 12. Under the action of the oil pressure in the first oil outlet chamber and the pre-tightening force of the first elastic element 13, the sealing valve 12 moves along the second direction and contacts the inner conical surface of the transition block 10 to form a sealing pair, thus closing the transition port. At this time, the oil pressure in the pressure regulating chamber 8 is rapidly established. Under the action of the oil pressure in the pressure regulating chamber 8 and the second elastic element 14, the valve core 7 overcomes the oil pressure in the injection chamber 9 and moves along the first direction, thereby closing the second fuel injection port 302 and ending the injection process.

[0052] It should be noted that the piezoelectric crystal 16 is used, which has a rapid response, large driving force and accurate return, and can quickly and accurately open and close the sealing valve 12, thereby achieving precise control of the second fuel.

[0053] Optionally, the sealing assembly includes an armature 20, a sealing ball 21, a ball seat 22, and a valve seat 23. The valve seat 23 has a guide channel that extends through it. The armature 20 is slidably fitted to the inner wall of the guide channel. The ball seat 22 is fixedly connected to the armature 20 and has a ball socket. The sealing ball 21 fits into the ball socket. The fuel injector also includes an upper body 27 and a second fastener 25. An electromagnet assembly 5 is fixedly connected to the upper body 27. The upper body 27 and the injection body 2 are fixedly connected by the second fastener 25. The electromagnet assembly 5 is configured to drive the armature 20 to move so that the sealing ball 21 opens or closes the first oil outlet passage. With this configuration, when the electromagnet assembly 5 is energized, the armature 20 is lifted along the second direction under the action of electromagnetic force, and the sealing ball 21 opens under the action of oil pressure in the control chamber 41. At this time, the pressure in the control chamber 41 drops, and the needle valve 6 moves along the second direction under the action of oil pressure in the first fuel chamber 1, opening the first fuel injection hole 301, and the first fuel enters the combustion chamber. When the electromagnet assembly 5 is de-energized, the armature 20 moves along the first direction, the sealing ball 21 closes the first oil outlet on the valve sleeve 4, and the needle valve 6 moves along the first direction under the action of oil pressure in the control chamber 41, contacting the conical surface of the valve body 3 to form a sealing pair, sealing the first fuel injection hole 301, and ending the injection.

[0054] Optionally, the central axis of the first fuel injection hole 301 coincides with the central axis of the second fuel injection hole 302 and is located at the center of the combustion chamber. This allows the fuel to be evenly distributed and mixed, which is beneficial to the combustion organization and the improvement of engine thermal efficiency.

[0055] This embodiment also provides an engine, including a combustion chamber and a fuel injector as described above, wherein the first fuel injection port 301 and the second fuel injection port 302 are both connected to the combustion chamber.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A fuel injector, characterized in that, include: The injector body has a first fuel chamber (1) along a first direction. The injector body includes an injection body (2) and a valve body (3). The injection body (2) is fixedly connected to the valve body (3). The injection body (2) has a first fuel inlet (201). The valve body (3) has a first fuel injection hole (301). The first fuel inlet (201) and the first fuel injection hole (301) are both connected to the first fuel chamber (1). Valve sleeve (4), the valve sleeve (4) has a control chamber (41), a first oil outlet passage and a first oil inlet passage, the first oil inlet passage connects the first fuel chamber (1) and the control chamber (41), and the first oil outlet passage connects the control chamber (41) and the first fuel chamber (1); A sealing assembly and an electromagnet assembly (5), the electromagnet assembly (5) being configured to drive the sealing assembly to move so that the sealing assembly can open or close the first oil outlet passage; A needle valve (6) is provided, one end of which is slidably engaged with the control chamber (41) along the first direction, and the other end of which is used to close the first fuel injection port (301). The valve core (7) has a cavity and a second fuel injection hole (302) inside the valve body (3). One end of the valve core (7) slides with the inner wall of the cavity to divide the cavity into a pressure regulating chamber (8) and an injection chamber (9). The injection body (2) also has a second fuel inlet (202), a control oil inlet (203) and a control oil outlet (204). The control oil inlet (203) and the control oil outlet (204) are both connected to the pressure regulating chamber (8). The injection chamber (9) is connected to the second fuel inlet (202) and the second fuel injection hole (302). The other end of the valve core (7) is used to close the second fuel injection hole (302).

2. The fuel injector according to claim 1, characterized in that, The fuel injector further includes a transition block (10), an orifice plate (11), a sealing valve (12), a first elastic element (13), and a drive assembly. The injection body (2), the transition block (10), and the orifice plate (11) are sequentially connected along the first direction. The orifice plate (11) has a second oil inlet channel (111) and a second oil outlet channel (112). The second oil inlet channel (111) connects the control oil inlet (203) and the pressure regulating chamber (8). The transition block (10) has a first oil outlet chamber and a transition port. The second oil outlet channel (112) connects the pressure regulating chamber (8) and the first oil outlet chamber. The inner diameter of (111) is smaller than the inner diameter of the second oil outlet (112). The injection body (2) has a second oil outlet chamber. The control oil outlet (204) is connected to the second oil outlet chamber. The transition port is connected to the first oil outlet chamber and the second oil outlet chamber. The sealing valve (12) is disposed in the first oil outlet chamber. The first elastic element (13) is configured to always have the tendency to drive the sealing valve (12) to move towards the position of closing the transition port. The driving assembly is disposed in the second oil outlet chamber, and the driving assembly can drive the sealing valve (12) to move so that the sealing valve (12) can open the transition port.

3. The fuel injector according to claim 2, characterized in that, The fuel injector further includes a second elastic element (14) disposed within the pressure regulating chamber (8), and the second elastic element (14) is configured to always have a tendency to drive the valve core (7) to move toward the position of closing the second fuel injection orifice (302).

4. The fuel injector according to claim 3, characterized in that, The fuel injector also includes a support base (15), which includes a sliding part (151) and a protrusion (152) connected in sequence. The sliding part (151) is placed in the pressure regulating chamber (8) and slidably sleeved on the valve body (3). The protrusion (152) abuts against the valve core (7). The second elastic member (14) is sleeved on the sliding part (151), and the two ends of the second elastic member (14) abut against the orifice plate (11) and the protrusion (152) respectively.

5. The fuel injector according to claim 2, characterized in that, The drive assembly includes a piezoelectric crystal (16), a mounting base (17), a third elastic element (18), and a transmission block (19). The mounting base (17) is fixedly installed on the inner wall of the second oil outlet chamber. The piezoelectric crystal (16) is disposed in the second oil outlet chamber and fixedly connected to the mounting base (17). The two ends of the third elastic element (18) abut against the transmission block (19) and the transition block (10) respectively, so that the transmission block (19) and the sealing valve (12) are spaced apart along the first direction. The piezoelectric crystal (16) is configured to drive the transmission block (19) to abut against the sealing valve (12) and open the transition port.

6. The fuel injector according to claim 5, characterized in that, The third elastic element (18) is a disc spring.

7. The fuel injector according to claim 1, characterized in that, The sealing assembly includes an armature (20), a sealing ball (21), and a ball seat (22). The ball seat (22) is fixedly connected to the armature (20). The ball seat (22) has a ball socket. The sealing ball (21) fits into the ball socket. The electromagnet assembly (5) is configured to drive the armature (20) to move so that the sealing ball (21) opens or closes the first oil outlet passage.

8. The fuel injector according to claim 7, characterized in that, The sealing assembly also includes a valve seat (23) having a guide channel extending through itself, and the armature (20) slidingly fitting against the inner wall of the guide channel.

9. The fuel injector according to claim 1, characterized in that, The central axis of the first fuel injection hole (301) coincides with the central axis of the second fuel injection hole (302).

10. An engine, characterized in that, It includes a combustion chamber and a fuel injector as described in any one of claims 1-9, wherein the first fuel injection port (301) and the second fuel injection port (302) are both connected to the combustion chamber.

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