Fuel injector and engine

Abstract

The invention relates to the technical field of automobile power devices, in particular to a fuel injector and an engine, first fuel enters a first fuel cavity from a first fuel inlet, and when an electromagnet assembly is powered on, the electromagnet assembly drives a sealing assembly to open a first oil outlet channel and controls oil pressure in the cavity to be reduced; the needle valve opens the first fuel spraying hole under the action of oil pressure in the first fuel cavity, first fuel enters the combustion chamber, second fuel enters the oil spraying cavity through the second fuel inlet, control oil enters the pressure adjusting cavity through the control oil inlet, and the valve element closes the second fuel spraying hole under the action of oil pressure in the pressure adjusting cavity. And when the oil inlet amount is smaller than the oil outlet amount, the oil pressure in the pressure adjusting cavity is reduced, the valve element opens the second fuel spraying hole under the action of the oil pressure in the oil spraying cavity, and the second fuel enters the combustion chamber. Independent control and injection of two different kinds of fuel can be achieved, and the economical efficiency, the dynamic property and the emission performance of the engine are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile power devices, and in particular to a fuel injector and an engine. Background Art

[0002] The fuel injector is used to spray fuel directly into the cylinder or intake duct under a certain pressure. It is an important structural component in the engine fuel supply system, and its injection performance has a very important influence on the engine performance.

[0003] In order to ensure the sustainable development of energy, the existing automotive field has begun to seek alternative energy sources for vehicles, and with the gradual deepening of environmental protection concepts, the application of low-carbon and zero-carbon fuels in vehicles has become increasingly urgent. Among them, natural gas, methanol, etc., as alternative energy sources, are relatively low in price and relatively easy to prepare, and the emission products are also relatively environmentally friendly. Hydrogen, as a zero-carbon fuel, does not contain greenhouse gases in its emission products and has a high energy density. Therefore, the engine's power, economy, and emission performance can be further improved through the flexible mixing ratio of various types of fuels. However, the existing fuel injectors are not suitable for the independent control and injection of multiple fuels, have poor flexibility, and affect the engine's power, economy, and emission performance to a certain extent.

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

[0005] The object of the present invention is to provide a fuel injector and an engine, which can realize independent control and injection of two different fuels, and effectively improve the economy, power and emission performance of the engine.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides a fuel injector, comprising:

[0008] An injector body, wherein the injector body is provided with a first fuel cavity along a first direction, the injector body comprises an injector body and a valve body, the injector body is fixedly connected to the valve body, the injector body is provided with a first fuel inlet, the valve body is provided with a first fuel spray hole, and the first fuel inlet and the first fuel spray hole are both connected to the first fuel cavity;

[0009] A valve sleeve, wherein the valve sleeve is provided with a control chamber, a first oil outlet passage and a first oil inlet passage, wherein the first oil inlet passage is connected to the first fuel chamber and the control chamber, and the first oil outlet passage is connected to 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 so that the sealing assembly can open or close the first oil outlet passage;

[0011] a needle valve, wherein the needle valve is disposed in the first fuel cavity, one end of the needle valve is slidably matched with the control cavity along the first direction, and the other end of the needle valve is used to close the first fuel spray hole;

[0012] A valve core, a cavity and a second fuel spray hole are provided inside the valve body, one end of the valve core is slidably matched with the inner wall of the cavity to separate the cavity into a pressure regulating chamber and an oil spray hole, the injection body is also provided with 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 oil spray hole is connected to the second fuel inlet and the second fuel spray hole, and the other end of the valve core is used to close the second fuel spray hole.

[0013] As a preferred technical solution of the above-mentioned fuel injector, the fuel injector also includes a transition block, an orifice plate, a sealing valve, a first elastic member and a driving assembly, the injection body, the transition block and the orifice plate are connected in sequence along the first direction, the orifice plate is provided with a second oil inlet and a second oil outlet, the second oil inlet communicates with the control oil inlet and the pressure regulating chamber, the transition block is provided with a first oil outlet chamber and a transition port, the second oil outlet communicates with the pressure regulating chamber and the first oil outlet chamber, the inner diameter of the second oil inlet is smaller than the inner diameter of the second oil outlet, the injection body is provided with a second oil outlet chamber, the control oil outlet communicates with the second oil outlet chamber, the transition port communicates with the first oil outlet chamber and the second oil outlet chamber, the sealing valve is arranged in the first oil outlet chamber, the first elastic member is configured to always have a tendency to drive the sealing valve to move to a position closing the transition port, the driving assembly is arranged in the second oil outlet chamber, and the driving assembly can drive the sealing valve to move so that the sealing valve can open the transition port.

[0014] As a preferred technical solution of the above-mentioned fuel injector, the fuel injector also includes a second elastic member, which is arranged in the pressure regulating chamber, and the second elastic member is configured to always have a tendency to drive the valve core to move toward a position to close the second fuel injection hole.

[0015] As a preferred technical solution of the above-mentioned fuel injector, the fuel injector also includes a support seat, the support seat includes a sliding portion and a protruding portion connected in sequence, the sliding portion is placed in the pressure regulating chamber, and is slidably sleeved on the valve body, the protruding portion abuts against the valve core, the second elastic member is sleeved on the sliding portion, and the two ends of the second elastic member respectively abut against the orifice plate and the protruding portion.

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

[0017] As a preferred technical solution of the above-mentioned fuel injector, the third elastic member is a disc spring.

[0018] As a preferred technical solution for 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 in 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.

[0019] As a preferred technical solution of the above fuel injector, the sealing assembly further comprises a valve seat, the valve seat has a guide channel penetrating the valve seat, and the armature is slidably fitted in the inner wall of the guide channel.

[0020] As a preferred technical solution 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 further provides an engine, comprising a combustion chamber and the fuel injector in any of the above schemes, wherein the first fuel injection hole and the second fuel injection hole are both connected to the combustion chamber.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a fuel injector and an engine, the fuel injector comprising: 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 is provided with a first fuel cavity along a first direction, the injector body comprises an injection body and a valve body, the injection body is fixedly connected to the valve body, the injection body is provided with a first fuel inlet, the valve body is provided with a first fuel spray hole, the first fuel inlet and the first fuel spray hole are both connected to the first fuel cavity, the valve sleeve is provided with a control cavity, a first oil outlet and a first oil inlet, the first oil inlet is connected to the first fuel cavity and the control cavity, the first oil outlet is connected to the control cavity and the first fuel cavity, 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 channel. The needle valve is arranged in the first fuel cavity, and one end of the needle valve is slidably matched with the control cavity along the first direction, and the other end of the needle valve is used to close the first fuel spray hole. A cavity and a second fuel spray hole are provided inside the valve body, and one end of the valve core is slidably matched with the inner wall of the cavity to separate the cavity into a pressure regulating cavity and an oil injection cavity. The injection body is also provided with 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 cavity, and the oil injection cavity is connected to the second fuel inlet and the second fuel spray hole. The other end of the valve core is used to close the second fuel spray hole. With such arrangement, the first fuel enters the first fuel chamber from the first fuel inlet, and the needle valve closes the first fuel spray hole under the action of the oil pressure in the control chamber. When the electromagnet assembly is energized, it drives the sealing assembly to open the first oil outlet passage. At this time, the oil pressure in the control chamber drops, and the needle valve opens the first fuel spray hole under the action of the oil pressure in the first fuel chamber, and the first fuel enters the combustion chamber through the first fuel spray hole on the valve body. When the electromagnet assembly is de-energized, it drives the sealing assembly to close the first oil outlet passage. At this time, the needle valve closes the first fuel spray hole under the action of the oil pressure in the control chamber, and the injection ends.

[0024] The second fuel enters the injection chamber from the second fuel inlet, and the control oil enters the pressure regulating chamber through the control oil inlet. The valve core closes the second fuel spray hole under the oil pressure in the pressure regulating chamber, and the injection is completed by adjusting the oil inlet and oil outlet in the pressure regulating chamber. When the oil inlet is less than the oil outlet, the oil pressure in the pressure regulating chamber drops, and the valve core opens the second fuel spray hole under the oil pressure in the injection chamber, and the second fuel enters the combustion chamber through the second fuel spray hole on the valve body. It can realize the independent control and injection of two different fuels, that is, the injection pressure, injection timing, and injection amount of the two fuels are independently and accurately controllable, effectively improving the economy, power, and emission performance of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of a 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. A 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 hole; 302. Second fuel injection hole;

[0031] 4. valve sleeve; 41. control chamber;

[0032] 5. Electromagnet assembly; 6. Needle valve; 7. Valve core; 8. Pressure regulating chamber; 9. Oil 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 member; 14. Second elastic member;

[0035] 15. Support seat; 151. Sliding portion; 152. Protruding portion;

[0036] 16. piezoelectric crystal; 17. mounting seat; 18. third elastic member; 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 DESCRIPTION

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

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0039] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0042] like Figure 1 to Figure 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 is provided with a first fuel cavity 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 is provided with a first fuel inlet 201. The valve body 3 is provided with a first fuel spray hole 301. The first fuel inlet 201 and the first fuel spray hole 301 are both connected to the first fuel cavity 1. The valve sleeve 4 is provided with a control cavity 41, a first oil outlet channel and a first oil inlet channel. The first oil inlet channel is connected to the first fuel cavity 1 and the control cavity 41. The first oil outlet channel is connected to the control cavity 41 and the first fuel cavity 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 channel, the needle valve 6 is arranged in the first fuel chamber 1, and one end of the needle valve 6 slides with the control chamber 41 along the first direction, the other end of the needle valve 6 is used to close the first fuel spray hole 301 and form a conical sealing pair, the valve body 3 is provided with a cavity and a second fuel spray hole 302, one end of the valve core 7 slides with the inner wall of the cavity to separate the cavity into a pressure regulating chamber 8 and an injection chamber 9, the injection body 2 is also provided with a second fuel inlet 202, a control oil inlet 203, a control oil outlet 204 and an oil outlet 26, 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 spray hole 302, the other end of the valve core 7 is used to close the second fuel spray hole 302, and the oil outlet 26 is connected to the first fuel chamber 1. In this arrangement, the first fuel enters the first fuel chamber 1 from the first fuel inlet 201, and the needle valve 6 closes the first fuel spray hole 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 which time the oil pressure in the control chamber 41 drops, and the needle valve 6 opens the first fuel spray hole 301 under the action of the oil pressure in the first fuel chamber 1, and the first fuel enters the combustion chamber through the first fuel spray hole 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, and at this time the needle valve 6 closes the first fuel spray hole 301 under the action of the oil pressure in the control chamber 41, thereby ending the injection.

[0043] The second fuel enters the injection chamber 9 from the second fuel inlet 202, and the 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. The valve core 7 closes the second fuel spray hole 302 under the oil pressure in the pressure regulating chamber 8, and completes the injection by adjusting the oil inlet and oil outlet in the pressure regulating chamber 8. When the oil inlet is less than the oil outlet, the oil pressure in the pressure regulating chamber 8 drops, and the valve core 7 opens the second fuel spray hole 302 under the oil pressure in the injection chamber 9, and the second fuel enters the combustion chamber through the second fuel spray hole 302 on the valve body 3. It can realize the independent control and injection of two different fuels, that is, the injection pressure, injection timing, and injection amount of the two fuels are independently and accurately controllable, effectively improving the economy, power, and emission performance of the engine.

[0044] Furthermore, the first fuel is a compression ignition fuel such as diesel, and the second fuel is a low-carbon or zero-carbon fuel such as methane, methanol, and hydrogen. It should be noted that the number and diameter of the first fuel nozzle 301 and the second fuel nozzle 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. In order to achieve a better combustion organization, the number of the first fuel nozzle 301 and the second fuel nozzle 302 is generally equal, and the first direction and the second direction are respectively as follows: Figure 1 The two arrows in the diagram 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 close mating surfaces with the cylindrical surface of the valve body 3 respectively, and the radial clearance is 0.004mm-0.006mm.

[0046] Specifically, the following scheme is exemplified in this embodiment: the fuel injector further includes a transition block 10, an orifice plate 11, a sealing valve 12, a first elastic member 13, a second elastic member 14, a driving 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 through the first fastener 24, the orifice plate 11 is provided with a second oil inlet passage 111 and a second oil outlet passage 112, the second oil inlet passage 111 is connected to the control oil inlet 203 and the pressure regulating chamber 8, the transition block 10 is provided with a first oil outlet chamber and a transition port, and the second oil outlet passage 112 is provided. 12 connects the pressure regulating chamber 8 with the first oil outlet chamber, 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 is provided with a second oil outlet chamber, the control oil outlet 204 connects the second oil outlet chamber, the transition port connects the first oil outlet chamber with the second oil outlet chamber, the sealing valve 12 is arranged in the first oil outlet chamber, the first elastic member 13 is configured to always have a tendency to drive the sealing valve 12 to move to the closed transition port position, the driving assembly is arranged 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. The second elastic member 14 is arranged in the pressure regulating chamber 8, and the second elastic member 14 is configured to always have a tendency to drive the valve core 7 to move to the closed second fuel injection hole 302 position. Specifically, the first elastic member 13 and the second elastic member 14 are both compression springs.

[0047] In this arrangement, the valve core 7 closes the second fuel spray hole 302 under the action of the oil pressure in the pressure regulating chamber 8 and the preload force of the second elastic member 14, and the start-up drive assembly drives the sealing valve 12 to move to open 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 channel 112 and return to the low-pressure oil circuit to the oil tank. Since the flow rate of the second oil inlet channel 111 is less than the flow rate of the second oil outlet channel 112, when the transition port is opened, the inflow of the control oil in the pressure regulating chamber 8 is less than the outflow, and the pressure in the pressure regulating chamber 8 is reduced. When the pressure in the pressure regulating chamber 8 is reduced to a certain level, the valve core 7 overcomes the oil pressure in the pressure regulating chamber 8 and the preload force of the second elastic member 14 under the action of the oil pressure in the injection chamber 9, and then opens the second fuel spray hole 302 to achieve injection.

[0048] Optionally, in order to ensure that the direction of the elastic force of the second elastic member 14 is stable and to prevent the second elastic member 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 portion 151 and a protruding portion 152 connected in sequence, the sliding portion 151 is placed in the pressure regulating chamber 8, and is slidably sleeved on the valve body 3, the protruding portion 152 abuts against the valve core 7, the second elastic member 14 is sleeved on the sliding portion 151, and the two ends of the second elastic member 14 abut against the orifice plate 11 and the protruding portion 152 respectively.

[0049] It should be noted that by adjusting the total height of the support seat 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, and by adjusting the height of the protrusion 152, the preload force of the valve core 7 in the initial state can be adjusted.

[0050] In this embodiment, the driving assembly includes a piezoelectric crystal 16, a mounting seat 17, a third elastic member 18 and a transmission block 19. The mounting seat 17 is fixedly mounted on the inner wall of the second oil outlet cavity. The piezoelectric crystal 16 is disposed in the second oil outlet cavity and is fixedly connected to the mounting seat 17. The two ends of the third elastic member 18 are respectively abutted against the transmission block 19 and the transition block 10, so that the transmission block 19 and the sealing valve 12 are spaced apart in the first direction. The piezoelectric crystal 16 is configured to drive the transmission block 19 to abut against the sealing valve 12 to open the transition port. Specifically, the third elastic member 18 is a disc spring. In this arrangement, the piezoelectric crystal 16 indirectly controls the injection of the second fuel by controlling the oil pressure 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, pushing the transmission block 19 to overcome the force of the third elastic member 18 and move along the first direction. When the transmission block 19 contacts the sealing valve 12, it pushes the sealing valve 12 to move along 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 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 powered off, the piezoelectric crystal 16 is separated from the transmission block 19 and the sealing valve 12 under the action of the third elastic member 18. The sealing valve 12 moves in the second direction under the action of the oil pressure in the first oil outlet chamber and the preload force of the first elastic member 13, and contacts with the conical surface of the inner hole of the transition block 10 to form a sealing pair, thereby closing the transition port. At this time, the oil pressure in the pressure regulating chamber 8 is rapidly established, and the valve core 7 overcomes the oil pressure in the injection chamber 9 and moves in the first direction under the action of the oil pressure in the pressure regulating chamber 8 and the second elastic member 14, thereby closing the second fuel nozzle 302 and ending the injection process.

[0052] It should be noted that the piezoelectric crystal 16 has a quick response, a strong driving force and an 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 having a guide channel running through the armature 20, the armature 20 slidingly fits on the inner wall of the guide channel, the ball seat 22 is fixedly connected to the armature 20, the ball seat 22 has a ball socket, the sealing ball 21 fits in the ball socket, the fuel injector also includes an upper body 27 and a second fastener 25, the electromagnet assembly 5 is fixedly connected to the upper body 27, the upper body 27 is fixedly connected to the injection body 2 via the second fastener 25, and 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 channel. In this arrangement, when the electromagnet assembly 5 is energized, the armature 20 is lifted in the second direction by the electromagnetic force, and the sealing ball 21 is opened by the oil pressure in the control chamber 41. At this time, the pressure in the control chamber 41 drops, and the needle valve 6 moves in the second direction under the action of the oil pressure in the first fuel chamber 1 to open the first fuel spray hole 301, and the first fuel enters the combustion chamber; when the electromagnet assembly 5 is de-energized, the armature 20 moves in the first direction, the sealing ball 21 closes the first oil outlet channel on the valve sleeve 4, and the needle valve 6 moves in the first direction under the action of the oil pressure in the control chamber 41, contacts the conical surface of the valve body 3 to form a sealing pair, closes the first fuel spray hole 301, and ends 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, which can make the fuel evenly distributed and mixed, which is beneficial to the improvement of combustion organization and engine thermal efficiency.

[0055] This embodiment further provides an engine, comprising a combustion chamber and the fuel injector in the above solution, wherein the first fuel injection hole 301 and the second fuel injection hole 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 embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fuel injector, characterized in that: include: An injector body, wherein the injector body is provided with a first fuel cavity (1) along a first direction, the injector body comprises an injector body (2) and a valve body (3), the injector body (2) is fixedly connected to the valve body (3), the injector body (2) is provided with a first fuel inlet (201), the valve body (3) is provided with a first fuel spray hole (301), and the first fuel inlet (201) and the first fuel spray hole (301) are both connected to the first fuel cavity (1); A valve sleeve (4), the valve sleeve (4) being provided with a control chamber (41), a first oil outlet passage and a first oil inlet passage, the first oil inlet passage being connected to the first fuel chamber (1) and the control chamber (41), and the first oil outlet passage being connected to the control chamber (41) and the first fuel chamber (1); A sealing assembly and an electromagnet assembly (5), wherein the electromagnet assembly (5) is 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), one end of the needle valve (6) being slidably matched with the control chamber (41) along the first direction, and the other end of the needle valve (6) being used to close the first fuel injection hole (301); A valve core (7), a cavity and a second fuel spray hole (302) are provided inside the valve body (3), one end of the valve core (7) is slidably matched with the inner wall of the cavity to separate the cavity into a pressure regulating chamber (8) and an oil spray chamber (9), the injection body (2) is also provided with 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 oil spray chamber (9) is connected to the second fuel inlet (202) and the second fuel spray hole (302), and the other end of the valve core (7) is used to close the second fuel spray hole (302).

2. The fuel injector according to claim 1, characterized in that The fuel injector further comprises a transition block (10), an orifice plate (11), a sealing valve (12), a first elastic member (13) and a driving 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) is provided with a second oil inlet passage (111) and a second oil outlet passage (112). The second oil inlet passage (111) is connected to the control oil inlet (203) and the pressure regulating chamber (8). The transition block (10) is provided with a first oil outlet chamber and a transition port. The second oil outlet passage (112) is connected to 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 passage (112), the injection body (2) is provided with 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 arranged in the first oil outlet chamber, the first elastic member (13) is configured to always have a tendency to drive the sealing valve (12) to move to a position closing the transition port, the driving component is arranged in the second oil outlet chamber, and the driving component 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 comprises a second elastic member (14), the second elastic member (14) being arranged in the pressure regulating chamber (8), and the second elastic member (14) being configured to always have a tendency to drive the valve core (7) to move toward a position closing the second fuel injection hole (302).

4. The fuel injector according to claim 3, characterized in that The fuel injector further comprises a support seat (15), wherein the support seat (15) comprises a sliding portion (151) and a protruding portion (152) connected in sequence, wherein the sliding portion (151) is disposed in the pressure regulating chamber (8) and is slidably sleeved on the valve body (3), wherein the protruding portion (152) abuts against the valve core (7), and the second elastic member (14) is sleeved on the sliding portion (151), and the two ends of the second elastic member (14) abut against the orifice plate (11) and the protruding portion (152) respectively.

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

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

7. The fuel injector according to claim 1, characterized in that The sealing assembly comprises 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 in 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), the valve seat (23) having a guide channel running through the valve seat, and the armature (20) slidingly fits on 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 comprises a combustion chamber and a fuel injector as claimed in any one of claims 1 to 9, wherein the first fuel injection hole (301) and the second fuel injection hole (302) are both connected to the combustion chamber.

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