Dual fuel injector and vehicle

Abstract

The application provides a dual fuel injector and a vehicle. The dual fuel injector comprises a nozzle body, the nozzle body has a first chamber, a spray channel and a main fuel channel are arranged on the side wall of the nozzle body, the main fuel channel is communicated with a main fuel chamber, the spray channel is communicated with an external combustion chamber; a needle valve shell is movably arranged in the first chamber, the needle valve shell has a second chamber, a secondary fuel injection hole and a secondary fuel channel are arranged on the side wall of the needle valve shell, the secondary fuel channel is communicated with a secondary fuel chamber, the secondary fuel injection hole is arranged close to the spray channel, the needle valve shell has a first blocking position which abuts against part of the inner wall of the first chamber to block at least part of the spray channel, and the needle valve shell has a first avoiding position which is separated from part of the inner wall of the first chamber to make the spray channel communicated with the first chamber. The scheme at least solves the problem that the secondary fuel is easy to form carbon deposition in the injection hole, causing the injection hole to be blocked.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically, to a dual-fuel injector and a vehicle. Background Technology

[0002] Natural gas offers better cleanliness and economy compared to diesel, and its sales share in the heavy-duty vehicle sector has been increasing year by year. Currently, natural gas engines on the market primarily utilize low-pressure manifold injection technology, which, due to factors such as charging efficiency, limits its thermal efficiency. To address this issue, existing technologies employ dual-fuel injectors to directly inject diesel and natural gas into the combustion chamber at specific high pressures. A certain amount of diesel is used as a secondary fuel for ignition, while approximately 95% of the natural gas is injected as the primary fuel for combustion and power generation.

[0003] In existing technologies, dual-fuel injectors mostly employ upper and lower layers of nozzles to inject the primary and secondary fuels (the secondary fuel is generally diesel, and the primary fuel is gas) into the combustion chamber separately. The axial and circumferential relative positions of the two sets of nozzles need to be redesigned and matched according to the combustion chamber structure, resulting in a significant design workload. Furthermore, for the secondary fuel nozzles that play an ignition role, since the required injection volume is very small, accounting for only about 5%, small-diameter nozzles are unavoidable. In the high-temperature environment of the combustion chamber, the secondary fuel (usually diesel) is prone to carbon buildup inside the nozzles, leading to nozzle blockage.

[0004] There is currently no effective solution to the aforementioned technical problems. Summary of the Invention

[0005] The main objective of this invention is to provide a dual-fuel injector and vehicle to solve the problem in the prior art where the secondary fuel easily forms carbon deposits in the injection orifice, leading to orifice blockage.

[0006] To achieve the above objectives, according to one aspect of the present invention, a dual-fuel injector is provided, comprising: a nozzle body having a first chamber, an injection channel and a main fuel channel being formed on the side wall of the nozzle body, the main fuel channel communicating with the main fuel chamber, and the injection channel communicating with an external combustion chamber; a needle valve housing being movably disposed within the first chamber, the needle valve housing having a second chamber, an auxiliary fuel injection hole and an auxiliary fuel channel being formed on the side wall of the needle valve housing, the auxiliary fuel channel communicating with the auxiliary fuel chamber, the auxiliary fuel injection hole being disposed close to the injection channel, the needle valve housing having a first blocking position abutting against a portion of the inner wall of the first chamber to block at least a portion of the injection channel, and a first clearance position separating from a portion of the inner wall of the first chamber to allow the injection channel to communicate with the first chamber; wherein, when the needle valve housing is in the first blocking position, the auxiliary fuel channel can communicate with at least a portion of the injection channel through the auxiliary fuel injection hole.

[0007] Furthermore, the dual-fuel injector also includes a needle valve movably disposed within the second chamber. The needle valve has a second blocking position abutting against a portion of the inner wall of the second chamber to block at least a portion of the auxiliary fuel injection orifice, and a second clearance position separating from a portion of the inner wall of the second chamber to allow the auxiliary fuel injection orifice to communicate with the second chamber. The needle valve housing and the needle valve are independently controlled.

[0008] Furthermore, part of the injection channel includes a first channel and a second channel, the first channel and the second channel are connected, wherein the inner wall of part of the first channel and the nozzle body form a main fuel passage, and the inner wall of another part of the first channel and the nozzle body form a secondary fuel passage, the main fuel passage and the secondary fuel passage are connected in parallel.

[0009] Furthermore, when the needle valve housing is in the first sealing position, the geometric center line of the auxiliary fuel injection orifice is collinear with the geometric center line of the auxiliary fuel through-hole, and / or, the diameter of the auxiliary fuel through-hole is greater than or equal to the diameter of the auxiliary fuel injection orifice.

[0010] Furthermore, the geometric center line of the second channel is parallel to the geometric center line of the auxiliary fuel through-hole, and / or, the geometric center line of the second channel has an angle α with the geometric center line of the main fuel through-hole, where 0≤α≤25°.

[0011] Furthermore, the dual-fuel injector also includes a transition housing connected to the nozzle body. The transition housing has a mounting groove, one end of which is opposite to one end of the first chamber, so that the mounting groove communicates with the first chamber.

[0012] Furthermore, the dual-fuel injector also includes: a needle valve adjusting member, which is movably disposed in a mounting groove, one end of which has a first limiting boss, one end of which abuts against the open end of the needle valve housing; a first elastic member, which is disposed in the mounting groove, one end of which is connected to the bottom of the mounting groove, and the other end of which is connected to the other end of the first limiting boss, the first elastic member being used to provide abutment pressure between the first limiting boss and the needle valve housing; wherein, a portion of the needle valve adjusting member extends through the opening of the needle valve housing into the second chamber, the first limiting boss blocks at least a portion of the second chamber, and the first limiting boss blocks at least a portion of the mounting groove.

[0013] Furthermore, the needle valve includes a drive section, a blocking section, and an actuation section connected in sequence. The drive section is located near the needle valve adjusting member. At least part of the outer surface of the blocking section is in contact with the inner surface of the second chamber. The actuation section has a second blocking position and a second clearance position at the end away from the needle valve adjusting member. The diameter of the blocking section is larger than the diameter of the actuation section and the diameter of the blocking section is larger than the diameter of the drive section, so that one end of the blocking section, one end of the needle valve adjusting member, and part of the inner wall of the needle valve housing form a secondary fuel drive chamber. At least one of the transition housing and the needle valve housing has a secondary fuel inlet channel. The secondary fuel drive chamber communicates with the secondary fuel chamber through the secondary fuel inlet channel.

[0014] Furthermore, the other end of the blocking section forms a secondary fuel injection chamber with the inner wall of part of the needle valve housing. At least one of the transition housing and the needle valve housing is provided with a secondary fuel injection channel. A transition channel is provided on the outer surface of the blocking section. One end of the transition channel is connected to the secondary fuel injection channel, and the other end of the transition channel is connected to the secondary fuel injection chamber. The other end of the secondary fuel injection channel is connected to the secondary fuel channel.

[0015] Furthermore, a second limiting boss is formed at the connection between the sealing section and the driving section. The dual-fuel injector also includes a second elastic element. One end of the second elastic element is connected to the needle valve adjusting element, and the other end of the second elastic element is connected to the second limiting boss. The second elastic element is used to provide the abutment pressure between the actuating section and the inner wall of the needle valve housing.

[0016] Furthermore, a first gasket is provided between the first elastic member and the first limiting boss, and the first gasket is connected to at least one of the first elastic member and the needle valve adjusting member. The first elastic member is connected to the first limiting boss through the first gasket. And / or, a second gasket is provided between the second elastic member and the second limiting boss, and the second gasket is connected to at least one of the oil needle valve and the second elastic member. The second elastic member is connected to the second limiting boss through the second gasket.

[0017] Furthermore, the dual-fuel injector also includes a control valve body connected to a transition housing. The control valve body, the transition housing, and the nozzle body are provided with a main drive channel. The control valve body is provided with a drain channel. The control valve body includes a main adjustment component, which is disposed on either the main drive channel or the drain channel. One end of the main drive channel is connected to the mounting groove, and the other end of the main drive channel has a first working state connected to the drain channel and a first pressure stabilizing state disconnected from the drain channel.

[0018] Furthermore, the control valve body, the transition housing, and the nozzle body are provided with interconnected secondary drive channels. The control valve body also includes a secondary adjustment component, which is disposed on either the secondary drive channel or the drain channel. One end of the secondary drive channel is connected to the secondary fuel drive chamber, and the other end of the secondary drive channel has a second working state connected to the drain channel and a second pressure stabilizing state disconnected from the drain channel.

[0019] Furthermore, the control valve body is also provided with a main fuel inlet and a secondary fuel inlet. The outlet end of the main fuel inlet is connected to the first chamber through the main fuel channel, the inlet end of the main fuel inlet is connected to the main fuel chamber, the inlet section of the secondary fuel inlet is connected to the secondary fuel chamber, and the outlet end of the secondary fuel inlet is connected to the mounting groove, the secondary fuel inlet channel, and the secondary fuel channel.

[0020] According to another aspect of the present invention, a vehicle is provided having a dual-fuel injector, wherein the dual-fuel injector is the aforementioned dual-fuel injector.

[0021] The technical solution of this invention involves placing a needle valve housing within the first chamber of the nozzle body. The needle valve housing has a secondary fuel injection hole and a secondary fuel passage, which communicates with an external secondary fuel chamber. This allows the needle valve housing to inject secondary fuel through the injection hole. The nozzle body has an injection passage and a main fuel passage, which communicates with the main fuel chamber. This allows the first chamber to store main fuel, which can then be injected through the injection passage. Since the needle valve housing is movably disposed within the first chamber, it can block the injection passage, preventing communication between the injection passage and the first chamber. Simultaneously, the secondary fuel passage can communicate with the injection passage. The needle valve housing can also be moved to connect the first chamber with the injection passage. Therefore, the needle valve housing can control the injection passage to inject main fuel into the first chamber, or inject secondary fuel through the injection hole and injection passage, thus achieving dual-fuel injection. Furthermore, by placing the secondary fuel injection hole on the inner side of the nozzle body, away from the combustion chamber, the problem of secondary fuel being exposed to high temperatures for extended periods, which could lead to carbon buildup and clogging of the injection hole, can be avoided. Ultimately, without increasing structural complexity, the reliability, durability, and control precision of the dual-fuel injection system were improved. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 A schematic diagram of an embodiment of the dual-fuel injector according to the present invention is shown;

[0024] Figure 2It shows Figure 1 Enlarged diagram of point A in the middle.

[0025] The above figures include the following reference numerals:

[0026] 1. Nozzle body; 100. First chamber; 101. Injection channel; 1011. First channel; 10111. Main fuel through hole; 10112. Secondary fuel through hole; 1012. Second channel; 102. Main fuel channel;

[0027] 2. Needle valve housing; 200. Second chamber; 201. Secondary fuel injection port; 202. Secondary fuel passage;

[0028] 3. Needle valve; 300. Second limit boss; 31. Drive section; 310. Auxiliary fuel drive chamber; 32. Blocking section; 320. Transition channel; 33. Execution section; 330. Auxiliary fuel injection chamber;

[0029] 4. Transition shell; 400. Mounting slot; 401. Secondary fuel inlet channel; 402. Secondary fuel injection channel;

[0030] 5. Needle valve adjusting component; 500. First limit boss;

[0031] 6. First elastic element; 61. First gasket;

[0032] 7. Second elastic element; 71. Second gasket;

[0033] 8. Control valve body; 801. Main drive channel; 802. Secondary drive channel; 803. Drain channel; 804. Main fuel inlet; 805. Secondary fuel inlet; 81. Main regulating component; 82. Secondary regulating component. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0038] Combination Figure 1 , Figure 2 As shown, according to a specific embodiment of this application, a dual-fuel injector is provided.

[0039] Specifically, such as Figure 1 , Figure 2 As shown, the dual-fuel injector includes a nozzle body 1 and a needle valve housing 2. The nozzle body 1 has a first chamber 100, and an injection channel 101 and a main fuel channel 102 are formed on the side wall of the nozzle body 1. The main fuel channel 102 communicates with the main fuel chamber, and the injection channel 101 communicates with the external combustion chamber. The needle valve housing 2 is movably disposed in the first chamber 100. The needle valve housing 2 has a second chamber 200, and an auxiliary fuel injection port 201 and an auxiliary fuel channel 202 are formed on the side wall of the needle valve housing 2. The auxiliary fuel channel 202 communicates with the auxiliary fuel injection port 201 and the auxiliary fuel channel 202. The fuel chamber is connected, and the auxiliary fuel injection port 201 is located near the injection channel 101. The needle valve housing 2 has a first blocking position that abuts against a portion of the inner wall of the first chamber 100 to block at least a portion of the injection channel 101, and a first clearance position that separates from a portion of the inner wall of the first chamber 100 to allow the injection channel 101 to communicate with the first chamber 101. When the needle valve housing 2 is in the first blocking position, the auxiliary fuel channel 202 can communicate with at least a portion of the injection channel 101 through the auxiliary fuel injection port 201.

[0040] Applying the technical solution of this embodiment, the needle valve housing 2 is disposed in the first chamber 100 of the nozzle body 1. The needle valve housing 2 is provided with a secondary fuel injection hole 201 and a secondary fuel passage 202. The secondary fuel passage 202 communicates with the external secondary fuel chamber, so that the needle valve housing 2 can inject secondary fuel through the secondary fuel injection hole 201. The nozzle body 1 is provided with an injection passage 101 and a main fuel passage 102. The main fuel passage 102 communicates with the main fuel chamber, so that the first chamber 100 stores main fuel and can inject main fuel through the injection passage 101. Because the needle valve housing 2 is movably disposed within the first chamber 100, and can block the injection channel 101 through its movement, preventing the injection channel 101 from communicating with the first chamber 100, while the auxiliary fuel channel 202 can communicate with the injection channel 101, the needle valve housing 2 can also move to connect the first chamber 100 with the injection channel 101. Thus, the needle valve housing 2 can control the injection of main fuel into the first chamber 100 via the injection channel 101, or inject auxiliary fuel via the auxiliary fuel nozzle 201 and the injection channel 101, achieving dual-fuel injection. Furthermore, by placing the auxiliary fuel nozzle 201, which injects auxiliary fuel, inside the nozzle body 1 away from the combustion chamber, the problem of carbon buildup and clogging of the auxiliary fuel nozzle 201 due to prolonged exposure to high temperatures can be avoided. Ultimately, without increasing structural complexity, the reliability, durability, and control accuracy of the dual-fuel injection system are improved.

[0041] Specifically, the dual-fuel injector also includes a needle valve 3, which is movably disposed within the second chamber 200. The needle valve 3 has a second blocking position that abuts against a portion of the inner wall of the second chamber 200 to block at least a portion of the auxiliary fuel injection orifice 201, and a second clearance position that separates from a portion of the inner wall of the second chamber 200 to allow communication between the auxiliary fuel injection orifice 201 and the second chamber 200. The needle valve housing 2 and the needle valve 3 are independently controlled. The needle valve 3 is movably disposed within the second chamber 200, and its movement abuts against or separates from the inner wall of the second chamber 200, enabling the blocking and clearance of the auxiliary fuel injection orifice 201. This allows the auxiliary fuel injection orifice 201 to inject auxiliary fuel into the second chamber 200 according to the control of the needle valve 3. Meanwhile, by independently controlling the needle valve 3 and the needle valve housing 2, the injection of auxiliary fuel is controlled only by the needle valve 3, and the injection of main fuel is controlled only by the needle valve housing 2. This allows the injection of auxiliary fuel to be set to start before the injection of main fuel. Subsequently, when the main fuel is injected, the high-speed airflow can immediately dynamically flush the diesel liquid film and carbon deposit precursors remaining in the injection channel 101. The two work together to ensure ignition reliability and achieve continuous self-cleaning of the nozzle inner wall. This setting avoids the kinetic energy loss and leakage risks caused by fuel mixing in premixed designs, allowing the auxiliary fuel to fully maintain the high-pressure injection kinetic energy provided by the hydraulic system, and maintaining atomization quality.

[0042] It should be noted that the auxiliary fuel and the main fuel are controlled by independent mechanisms, which allows the injection quantity, injection pressure and injection timing of the auxiliary fuel to be optimized independently under different operating conditions. This improves the combustion stability and emission performance of the engine under harsh operating conditions such as low load, cold start and high exhaust gas recirculation, and enhances the durability and engineering applicability of the dual fuel injection system.

[0043] Furthermore, such as Figure 2 As shown, a portion of the injection channel 101 includes a first channel 1011 and a second channel 1012, which are connected. A portion of the inner wall of the first channel 1011 and the nozzle body 1 encloses a main fuel through-hole 10111, while the other portion of the inner wall of the first channel 1011 and the nozzle body 1 encloses a secondary fuel through-hole 10112. The main fuel through-hole 10111 and the secondary fuel through-hole 10112 are connected in parallel. By segmenting and layering the injection channel 101, a portion of the first channel 1011 is divided into the parallel main fuel through-hole 10111 and the secondary fuel through-hole 10112. This achieves physical separation and coordinated injection of the main and secondary fuels at the injection outlet, thereby improving the controllability of fuel injection without increasing the number of injection holes. The inlets of the main fuel through-hole 10111 and the auxiliary fuel through-hole 10112 correspond to the main fuel passage 102 and the auxiliary fuel injection hole 201, respectively, forming two parallel injection paths, so that the main fuel and the auxiliary fuel maintain independent injection dynamics characteristics in the final stage before entering the combustion chamber.

[0044] In this embodiment, since the main fuel through-hole 10111 and the auxiliary fuel through-hole 10112 are arranged in parallel, the main fuel through-hole 10111 continuously impacts the outlet area of ​​the auxiliary fuel through-hole 10112 with high-speed airflow during the injection process. The kinetic energy of the main fuel is used to dynamically flush the diesel liquid film and volatile deposits remaining on the inner wall of the auxiliary fuel through-hole 10112, effectively inhibiting the formation and adhesion of carbon deposits under high temperature conditions.

[0045] In one embodiment of this application, when the needle valve housing 2 is in the first blocking position, the geometric center line of the auxiliary fuel injection orifice 201 is collinear with the geometric center line of the auxiliary fuel through-hole 10112. This arrangement ensures that the auxiliary fuel can directly enter the auxiliary fuel through-hole 10112 inside the nozzle body 1 along the axial direction without changing its flow direction after being injected, thereby completely preserving the original injection kinetic energy and momentum direction given to the auxiliary fuel by the high-pressure oil circuit system, and avoiding liquid flow impact, energy dissipation and uneven atomization caused by flow channel deflection.

[0046] In another embodiment of this application, the aperture of the auxiliary fuel through-hole 10112 is greater than or equal to the aperture of the auxiliary fuel nozzle 201. This configuration eliminates the local throttling or adverse pressure gradient encountered by the auxiliary fuel after it is ejected from the needle valve housing 2, allowing the fuel to form a smooth diffusion transition when entering the auxiliary fuel through-hole 10112. This prevents the back pressure increase and liquid film accumulation at the nozzle outlet caused by the through-hole being too small, and also reduces the velocity gradient by expanding the flow cross-section, inhibiting fuel retention on the orifice wall and the adhesion of volatile deposits, thus delaying the formation of carbon deposit precursors. At the same time, during the high-speed injection of the main fuel, this structure, together with the strong airflow formed by the main fuel through-hole 10111, keeps the inner wall of the auxiliary fuel through-hole 10112 in a dynamically clean state, allowing residual fuel to be quickly blown away, forming a self-sustaining mechanism. The two work together to maximize the kinetic energy of the auxiliary fuel injection, optimize the flow path, and maximize the effectiveness of carbon deposit suppression without increasing the number of nozzles or introducing a complex premixing structure.

[0047] In one embodiment of this application, the geometric center line of the second channel 1012 is parallel to the geometric center line of the auxiliary fuel through-hole 10112. This arrangement ensures that after the main fuel is ejected through the second channel 1012, its flow direction is consistent with the axis of the auxiliary fuel through-hole 10112, allowing the main fuel jet to directly and continuously cover the inner wall surface of the auxiliary fuel through-hole 10112 along its extension path, forming an axial high-speed airflow barrier.

[0048] In another embodiment of this application, the geometric center line of the second channel 1012 and the geometric center line of the main fuel through-hole 10111 are at an angle α, where 0 ≤ α ≤ 25°. This arrangement causes the main fuel, after being ejected from the main fuel through-hole 10111, to deflect at a slight angle toward the auxiliary fuel through-hole 10112, forming an oblique impact effect on the outlet region of the auxiliary fuel through-hole 10112. This enhances the shear force of the airflow on the orifice wall, creating a swirling and turbulent region inside the injection channel 101, further promoting the atomization and diffusion of residual fuel, while avoiding pressure backflow or local vortex accumulation that may occur when the main fuel flow is completely axially opposed.

[0049] Furthermore, such as Figure 1 As shown, the dual-fuel injector also includes a transition housing 4, which is connected to the nozzle body 1. The transition housing 4 has a mounting groove 400, one end of which is opposite to one end of the first chamber 100, so that the mounting groove 400 communicates with the first chamber 100. The transition housing 4 provides a support and guiding base for the needle valve housing 2 and forms a sealing boundary between the first chamber 100 and the second chamber 200 with the nozzle body 1. The mounting groove 400 is positioned opposite to the opening of the needle valve housing 2, which allows the needle valve housing 2 to be aligned during axial movement and to be in a stable working space.

[0050] Furthermore, the dual-fuel injector also includes a needle valve adjusting member 5 and a first elastic member 6. The needle valve adjusting member 5 is movably disposed within the mounting groove 400. One end of the needle valve adjusting member 5 has a first limiting boss 500, and one end of the first limiting boss 500 abuts against the open end of the needle valve housing 2. The first elastic member 6 is disposed within the mounting groove 400. One end of the first elastic member 6 is connected to the bottom of the mounting groove 400, and the other end of the first elastic member 6 is connected to the other end of the first limiting boss 500. The first elastic member 6 is used to provide the abutment pressure between the first limiting boss 500 and the needle valve housing 2. A portion of the needle valve adjusting member 5 extends through the opening of the needle valve housing 2 into the second chamber 200. The first limiting boss 500 blocks at least a portion of the second chamber 200 and at least a portion of the mounting groove 400. The coordinated structure of the needle valve adjusting member 5 and the first elastic member 6 establishes a stable reset and limiting mechanism for the needle valve housing 2. The first limiting boss 500 at the end of the needle valve adjusting member 5 can continuously press against the open end of the needle valve housing 2 under the pre-tightening force of the first elastic member 6, so that the other end of the needle valve housing 2 away from the open end (i.e., the end closer to the injection channel 101) can always maintain the first blocking position when there is no control force. Through the surface contact between the first limiting boss 500 and the end face of the needle valve housing 2, the reset force is evenly transmitted, ensuring that the needle valve housing 2 maintains coaxial stability during high-frequency operation and extending its service life. The first elastic member 6 is disposed between the bottom of the mounting groove 400 and the first limiting boss 500. The needle valve housing 2 is entirely located in the first chamber 100 filled with main fuel. The needle valve housing 2 can be controlled to be in the first blocking position and the first avoidance position by the pressure in the mounting groove 400 and the elastic force of the first elastic member 6 and the pressure difference in the first chamber 100.

[0051] In this embodiment, since a second chamber 200 is provided inside the needle valve housing 2, when the first limiting boss 500 abuts against the open end of the needle valve housing 2, part of the structure of the first limiting boss 500 can extend into the second chamber 200, so that the first limiting boss 500 can simultaneously block the upper opening of the second chamber 200 and the opening of the mounting groove 400, thereby blocking the space for auxiliary fuel control injection, preventing high-pressure auxiliary fuel leakage or maintaining auxiliary fuel injection control pressure, and improving the auxiliary fuel control pressure response efficiency and injection consistency.

[0052] Furthermore, the needle valve 3 includes a drive section 31, a blocking section 32, and an actuation section 33 connected in sequence. The drive section 31 is located near the needle valve adjusting member 5. At least part of the outer surface of the blocking section 32 is in contact with the inner surface of the second chamber 200. The actuation section 33 has a second blocking position and a second avoidance position at the end away from the needle valve adjusting member 5. The diameter of the blocking section 32 is larger than the diameter of the actuation section 33, and the diameter of the blocking section 32 is larger than the diameter of the drive section 31, so that one end of the blocking section 32, one end of the needle valve adjusting member 5, and part of the inner wall of the needle valve housing 2 form a secondary fuel drive chamber 310. At least one of the transition housing 4 and the needle valve housing 2 is provided with a secondary fuel inlet channel 401. The secondary fuel drive chamber 310 is connected to the secondary fuel chamber through the secondary fuel inlet channel 401. The needle valve 3 is configured as a segmented structure, with each segment having a different or gradient diameter. The diameter of the sealing segment 32 is maximized, allowing it to contact the inner wall of the second chamber 200. The diameter of the driving segment 31 is smaller than that of the sealing segment 32, forming a secondary fuel driving chamber 310 between the driving segment 31 and the inner wall of the second chamber 200. The secondary fuel driving chamber 310 communicates with the secondary fuel chamber via a secondary fuel inlet channel 401, allowing it to be filled with high-pressure secondary fuel. This high-pressure secondary fuel in the secondary fuel driving chamber 310 applies pressure to the sealing segment 32. Similarly, the diameter of the actuating segment 33 is also smaller than that of the sealing segment 32, forming a cavity between the actuating segment 33 and the inner wall of the second chamber 200. The pressure between these two cavities controls the position of the entire needle valve 3, allowing the actuating segment 33 to be positioned in both the second sealing and second clearance positions.

[0053] Specifically, the other end of the blocking section 32 forms a secondary fuel injection chamber 330 with part of the inner wall of the needle valve housing 2. At least one of the transition housing 4 and the needle valve housing 2 has a secondary fuel injection channel 402. A transition channel 320 is formed on the outer surface of the blocking section 32. One end of the transition channel 320 is connected to the secondary fuel injection channel 402, and the other end of the transition channel 320 is connected to the secondary fuel injection chamber 330. The other end of the secondary fuel injection channel 402 is connected to the secondary fuel channel 202. The execution section 33 and the inner wall of the second chamber 200 form the secondary fuel injection chamber 330. The secondary fuel injection chamber 330 can also be connected to the secondary fuel chamber through the transition channel 320 and the secondary fuel injection channel 402. That is, the secondary fuel injection chamber 330 is also filled with secondary fuel. Since the secondary fuel in the secondary fuel injection chamber 330 can be injected through the secondary fuel injection hole 201, the pressure in the secondary fuel injection chamber 330 can change with the injection of secondary fuel. By simultaneously controlling the pressure in the auxiliary fuel injection chamber 330 and the pressure in the auxiliary fuel drive chamber 310, a pressure difference is formed at both ends of the needle valve 3, which can control the needle valve 3 to be in the second blocking position and the second clearance position, thereby controlling the injection of auxiliary fuel.

[0054] It should be noted that, since the sealing section 32 is in contact with the inner wall of the second chamber 200, a transition channel 320 needs to be opened on the outer wall of the sealing section 32 and the execution section 33. The transition channel 320 is connected to the auxiliary fuel injection channel 402, so that auxiliary fuel can be introduced into the auxiliary fuel injection chamber 330. This arrangement avoids the pressure interference and response delay caused by the shared channel between the control chamber and the injection chamber in the traditional structure. The opening of the needle valve 3 is triggered only by the pressure change between the auxiliary fuel drive chamber 310 and the auxiliary fuel injection chamber 330, while the injection process is driven entirely by the pressure difference.

[0055] Furthermore, a second limiting boss 300 is formed at the connection between the sealing section 32 and the driving section 31. The dual-fuel injector also includes a second elastic element 7. One end of the second elastic element 7 is connected to the needle valve adjusting element 5, and the other end of the second elastic element 7 is connected to the second limiting boss 300. The second elastic element 7 is used to provide the contact pressure between the actuating section 33 and the inner wall of the needle valve housing 2. The second limiting boss 300 and the second elastic element 7 work together to quickly pull the actuating section 33 of the needle valve 3 back to the second sealing position after the auxiliary fuel injection chamber 330 is depressurized, ensuring that the auxiliary fuel injection orifice 201 is closed during the non-injection stage, preventing high-pressure main fuel or combustion chamber back pressure from flowing back into the auxiliary fuel pipeline through the injection orifice.

[0056] In one exemplary embodiment of this application, a first gasket 61 is provided between the first elastic member 6 and the first limiting boss 500. The first gasket 61 is connected to at least one of the first elastic member 6 and the needle valve adjusting member 5. The first elastic member 6 is connected to the first limiting boss 500 through the first gasket 61. A second gasket 71 is provided between the second elastic member 7 and the second limiting boss 300. The second gasket 71 is connected to at least one of the oil needle valve 3 and the second elastic member 7. The second elastic member 7 is connected to the second limiting boss 300 through the second gasket 71. By providing a first gasket 61 between the first elastic member 6 and the first limiting boss 500, and a second gasket 71 between the second elastic member 7 and the second limiting boss 300, the first gasket 61 can absorb the local impact and vibration energy generated by axial fretting or thermal expansion and contraction of the needle valve adjusting member 5 during reciprocating motion. This prevents point contact friction or biting between the end of the first elastic member 6 and the first limiting boss 500, avoiding deformation, breakage, or elastic coefficient drift of the spring end, and ensuring long-term stability of the reset force. The second gasket 71 can avoid the stress concentration area formed at the edge of the second limiting boss 300 by the high-intensity reset force, preventing metal plastic deformation or micro-crack initiation, and extending the fatigue life of the needle valve 3.

[0057] It should be noted that the first gasket 61 and the second gasket 71, acting as buffering media, can isolate direct metal-to-metal friction, reducing the risk of stick-slip effects caused by high temperature, carbon buildup, or lubrication failure. This allows the needle valve 3 to maintain smooth, non-stick opening and closing characteristics during long-term operation. Furthermore, the elastic preload can be fine-tuned by replacing gaskets of different thicknesses or stiffnesses without replacing the entire elastic element, improving manufacturing and maintenance convenience.

[0058] Furthermore, the dual-fuel injector also includes a control valve body 8, which is connected to the transition housing 4. The control valve body 8, the transition housing 4, and the nozzle body 1 are provided with a communicating main drive channel 801. The control valve body 8 is also provided with a drain channel 803. The control valve body 8 includes a main adjusting member 81, which is disposed on either the main drive channel 801 or the drain channel 803. One end of the main drive channel 801 is connected to the mounting groove 400, and the other end of the main drive channel 801 has a first working state connected to the drain channel 803 and a first pressure-stabilizing state disconnected from the drain channel 803. The control valve body 8 is connected to the transition housing 4, and multiple channels can be integrated within the control valve body 8, the transition housing 4, and the nozzle body 1 to achieve injection control of the main fuel and auxiliary fuel by the control valve body 8. A main regulating component 81 is provided on the control valve body 8. The main regulating component 81, as a control execution unit, is located on the main drive channel 801 or the drain channel 803. Driven by an electromagnetic or electro-hydraulic servo, it realizes hydraulic control of the main drive channel 801 and the mounting groove 400. When the main regulating component 81 is in the first working state, the main drive channel 801 and the drain channel 803 are connected, allowing the high-pressure hydraulic fluid in the mounting groove 400 to be quickly discharged. This allows the needle valve housing 2 to move to the first clearance position under the action of the high-pressure main fuel in the first chamber 100, enabling the first main fuel to be injected through the injection channel 101. When the main regulating component 81 switches to the first pressure stabilization state, the main drive channel 801 and the drain channel 803 are disconnected, the mounting groove 400 is pressure stabilized, and the hydraulic fluid is in a static locked state. This maintains the main fuel in the first chamber 100 at a preset stable pressure, keeping the needle valve housing 2 in the first sealing position. This configuration achieves independent, programmable hydraulic control of the main fuel injection. Meanwhile, the drainage channel 803 provides a pressure relief outlet for the system, preventing valve body jamming or structural damage caused by abnormal pressure rise in the mounting slot 400, and improving the system's safety redundancy.

[0059] Furthermore, the control valve body 8, the transition housing 4, and the nozzle body 1 are provided with interconnected secondary drive channels 802. The control valve body 8 also includes a secondary adjusting component 82, which is disposed on either the secondary drive channel 802 or the discharge channel 803. One end of the secondary drive channel 802 is connected to the secondary fuel drive chamber 310, and the other end of the secondary drive channel 802 has a second working state connected to the discharge channel 803, and a second pressure-stabilizing state disconnected from the discharge channel 803. The coordinated configuration of the secondary drive channel 802 and the secondary adjusting component 82 establishes the hydraulic control principle for secondary fuel injection. A secondary regulating element 82 is provided on the secondary drive channel 802 or the drain channel 803. The secondary regulating element 82 can control the switching of the connection state between the secondary drive channel 802 and the drain channel 803. When the secondary drive channel 802 is in the second working state, the secondary drive channel 802 is connected to the drain channel 803, the pressure in the secondary fuel drive chamber 310 is released instantaneously, and the needle valve 3 moves rapidly upward under the high pressure of the secondary fuel injection chamber 330, so that the secondary fuel is injected into the combustion chamber through the transition channel 320 and the secondary fuel injection hole 201. When switching to the second pressure stabilization state, the secondary drive channel 802 is completely closed, the secondary fuel drive chamber 310 maintains a stable rail pressure, and the needle valve 3 closes under the action of the second elastic element 7 and the second limiting boss 300, switching to the second sealing position.

[0060] It should be noted that the parallel and independent design of the secondary regulator 82 and the main regulator 81 allows for arbitrary timing combinations of the injection pulses of the main and secondary fuels. For example, the secondary fuel can be injected before the main fuel to form a stable flame core, which is then expanded by the efficient combustion of the main fuel, resulting in a cleaner and more efficient combustion process. This design improves ignition reliability under cold start and low-load conditions, and because the control flow paths are completely independent and there is no cross-leakage, it reduces the risk of carbon buildup in the control valve core and channels, extending the overall service life of the system.

[0061] Furthermore, the control valve body 8 is also provided with a main fuel inlet 804 and a secondary fuel inlet 805. The outlet end of the main fuel inlet 804 is connected to the first chamber 100 through the main fuel channel 102, and the inlet end of the main fuel inlet 804 is connected to the main fuel chamber. The inlet section of the secondary fuel inlet 805 is connected to the secondary fuel chamber, and the outlet end of the secondary fuel inlet 805 is connected to the mounting groove 400, the secondary fuel inlet channel 401, and the secondary fuel channel 202. The inlet end of the main fuel inlet 804 is directly connected to the main fuel high-pressure rail, and the outlet end is directly connected to the first chamber 100 through the independent main fuel channel 102. This can minimize fluid resistance and pressure loss, ensuring that the high-pressure gas can reach the nozzle with maximum kinetic energy at the moment of injection opening, achieving an ideal injection pattern with high penetration distance and strong atomization. The inlet end of the auxiliary fuel inlet 805 is connected to the auxiliary fuel high-pressure rail, and the outlet end can simultaneously connect to the mounting groove 400, the auxiliary fuel inlet channel 401, and the auxiliary fuel channel 202. This allows the auxiliary fuel to provide control pressure to the auxiliary fuel drive chamber 310, driving the needle valve 3 to open. It can also supply pressure to the auxiliary fuel injection chamber 330 through the auxiliary fuel inlet channel 401, providing a power source for auxiliary fuel injection. At the same time, it can also continuously supply liquid to the auxiliary fuel nozzle 201 at the end of the nozzle body 1. This design significantly reduces the number of parts, simplifies the assembly process, and eliminates defects such as injection lag, uneven quantity, and unstable atomization caused by pressure difference or delay due to multiple pressure supply.

[0062] According to another specific embodiment of this application, a vehicle is also provided, the vehicle having a dual-fuel injector, the dual-fuel injector being the dual-fuel injector in the above embodiments.

[0063] This application also provides a preferred embodiment of a dual-fuel injector, which can effectively reduce the temperature of the nozzle orifice of the auxiliary fuel (usually diesel) nozzle and purge the residual auxiliary fuel in the nozzle orifice with the main fuel (gas), thereby reducing the risk of carbon buildup in the auxiliary fuel nozzle orifice.

[0064] Specifically, the dual-fuel injector includes a nozzle body 1 and a needle valve housing 2. The needle valve housing 2 is movably connected to the first chamber 100 of the nozzle body 1. A secondary fuel injection chamber 330 is formed between the head of the needle valve housing 2 and the inner end of the first chamber 100. The head of the needle valve housing 2 is provided with a secondary fuel injection orifice 201 for injecting secondary fuel. The end of the nozzle body 1 is provided with a secondary fuel through-hole 10112 mainly for injecting secondary fuel, a main fuel through-hole 10111 mainly for injecting primary fuel, and a second channel 1012. The secondary fuel through-hole 10112 and the main fuel through-hole 10111 converge in the second channel 1012 within the nozzle body 1. One end of the second channel 1012 is connected to the main fuel through-hole 10111 and the secondary fuel through-hole 10112, and the other end extends to the outside of the nozzle body 1 and enters the combustion chamber. The auxiliary fuel injection orifice 201, auxiliary fuel through-hole 10112, and main fuel through-hole 10111 all extend into the auxiliary fuel injection chamber 330. The head of the needle valve housing 2 can contact or separate from the inner end of the nozzle body 1 to open or close the auxiliary fuel through-hole 10112, main fuel through-hole 10111, and second channel 1012. The head of the needle valve housing 2 is provided with a boss, and the side of the boss moves and contacts the nozzle body 1 with the movement of the needle valve housing 2. The nozzle outlet of the auxiliary fuel injection orifice 201 is arranged on the side of the boss.

[0065] With the above configuration, the auxiliary fuel nozzle 201 is placed inside the auxiliary fuel injection chamber 330, thereby keeping the auxiliary fuel nozzle 201 away from the combustion flame, which helps to reduce the temperature of the auxiliary fuel nozzle head nozzle.

[0066] The auxiliary fuel through-hole 10112 has a diameter that is similar to or slightly larger than that of the auxiliary fuel nozzle 201, and their nozzle centerlines are aligned. The angle between the nozzle centerlines of the auxiliary fuel through-hole 10112 and the second channel 1012 is 0°, while the angle between the nozzle centerlines of the main fuel through-hole 10111 and the second channel 1012 is 0~25°. The alignment of the nozzle centerlines of the auxiliary fuel through-hole 10112 and the auxiliary fuel nozzle 201 ensures that the auxiliary fuel is ejected from the through-hole 10112 without reducing the injection kinetic energy of the auxiliary fuel. The outlet of the auxiliary fuel nozzle 201 is located on the side of the boss. By adjusting the size of the protruding diameter of the boss, while ensuring that the auxiliary fuel injection chamber 330 has a certain volume, the "disconnection" distance between the auxiliary fuel through-hole 10112 and the auxiliary fuel nozzle 201 can be reduced, which is beneficial for almost all of the auxiliary fuel to be ejected through the auxiliary fuel through-hole 10112. The diameter of the auxiliary fuel through-hole 10112 is similar to or slightly larger than that of the auxiliary fuel nozzle 201, ensuring that the auxiliary fuel is still ejected from the small-diameter nozzle and the atomization effect is not affected.

[0067] The main fuel through-hole 10111 and the nozzle centerline of the second channel 1012 are at a certain angle. This is to use the main fuel ejected through the main fuel through-hole 10111 to flush the auxiliary fuel ejected through the auxiliary fuel through-hole 10112 that is stuck to the wall of the second channel 1012, thereby further reducing the possibility of carbon buildup of the auxiliary fuel in the nozzle.

[0068] Both the main fuel and the auxiliary fuel enter the combustion chamber and are injected through the second channel 1012. Therefore, only the matching relationship between one set of injection holes and the combustion chamber needs to be considered, which can effectively reduce the design complexity.

[0069] The working principle of a dual-fuel injector is as follows:

[0070] The dual-fuel injector uses diesel as the secondary fuel and gas as the primary fuel. The secondary fuel is injected through the secondary fuel injection orifice 201, and the liquid enters the secondary fuel through-hole 10112 due to inertia via the secondary fuel injection chamber 330, then enters the second channel 1012. In the second channel 1012, it interacts with the gas in the cylinder and gradually atomizes. The primary fuel, influenced by the relative diameter of the injection orifices, is mainly injected through the primary fuel through-hole 10111 and enters the second channel 1012, flushing out the secondary fuel remaining in the second channel before entering the cylinder to participate in combustion. A small portion of the primary fuel enters the combustion chamber through the secondary fuel through-hole 10112, flushing out any remaining secondary fuel within the through-hole 10112.

[0071] The opening and closing of the needle valve housing 2 is controlled by the change in hydraulic pressure in the mounting groove 400, and the opening and closing of the oil needle valve 3 is controlled by the change in hydraulic pressure in the auxiliary fuel drive chamber 310.

[0072] When the auxiliary regulating element 82 is not working, the pressure inside the auxiliary fuel drive chamber 310 is consistent with the auxiliary fuel rail pressure. Under the combined action of the spring preload of the first elastic element 6, the downward hydraulic pressure of the auxiliary fuel drive chamber 310, and the upward hydraulic pressure of the auxiliary fuel injection chamber 330, the lower end of the needle valve 3 is pressed tightly against the needle valve housing 2.

[0073] When the auxiliary regulating component 82 is working, the drain channel 803 is opened, and the hydraulic fluid in the auxiliary fuel drive chamber 310 flows out from the drain channel 803, causing the pressure in the auxiliary fuel drive chamber 310 to drop. When the pressure in the auxiliary fuel drive chamber 310 drops to a certain critical value, the upward hydraulic pressure of the auxiliary fuel injection chamber 330 on the needle valve 3 is greater than the combined force of the downward hydraulic pressure of the auxiliary fuel drive chamber 310 and the downward preload of the first elastic element 6, thus causing it to move upward. The auxiliary fuel injection hole 201 opens, and the dual fuel injector injects auxiliary fuel into the auxiliary fuel through hole 10112 through the auxiliary fuel injection hole 201, and then enters the combustion chamber through the second channel 1012.

[0074] When the auxiliary regulating component 82 stops working, the drain channel 803 is closed, and the pressure in the auxiliary fuel drive chamber 310 is re-established to be equivalent to the auxiliary fuel rail pressure. When the upward hydraulic pressure of the auxiliary fuel injection chamber 330 on the needle valve 3 is less than the combined force of the downward hydraulic pressure of the auxiliary fuel drive chamber 310 and the downward pre-tightening force of the first elastic element 6, the needle valve 3 moves downward until the head is pressed tightly against the needle valve housing 2, and the fuel injection ends.

[0075] When the main regulating component 81 is not working, the pressure in the mounting groove 400 is slightly lower than the auxiliary fuel rail pressure (the magnitude is equal to the design oil-gas pressure difference). Under the combined action of the spring preload of the second elastic component 7, the downward hydraulic pressure of the mounting groove 400, and the upward hydraulic pressure of the first chamber 100, the lower end of the needle valve housing 2 is pressed against the nozzle body 1.

[0076] When the main regulating component 81 is working, the drain channel 803 is opened, and the liquid in the mounting groove 400 flows out from the drain channel 803. The pressure in the mounting groove 400 drops. When the pressure in the mounting groove 400 drops to a certain critical value, the upward hydraulic pressure of the first chamber 100 on the needle valve housing 2 is greater than the downward hydraulic pressure of the mounting groove 400 and the downward pre-tightening force of the second elastic element 7, thus causing it to move upward. The main fuel injection valve opens, and the main fuel enters the main fuel through hole 10111 and the auxiliary fuel through hole 10112, and then enters the combustion chamber through the second channel 1012.

[0077] When the main regulating component 81 stops working, the drain channel 803 is closed, and the pressure in the control chamber is re-established to the initial time. When the hydraulic pressure on the needle valve housing 2 from the first chamber 100 is less than the hydraulic pressure from the mounting groove 400 and the combined force of the pre-tightening force from the second elastic element 7, the needle valve housing 2 moves downward until the head is pressed tightly against the nozzle body 1, and the main fuel injection ends.

[0078] As can be seen from the above description, the dual-fuel injector in the above embodiments has the following beneficial effects:

[0079] Dual-fuel injectors can better utilize the injection kinetic energy generated by the auxiliary fuel hydraulic system, giving the auxiliary fuel a higher penetration distance and atomization effect.

[0080] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0081] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-fuel injector, characterized in that, include: The nozzle body (1) has a first chamber (100). An injection channel (101) and a main fuel channel (102) are provided on the side wall of the nozzle body (1). The main fuel channel (102) is connected to the main fuel chamber, and the injection channel (101) is connected to the external combustion chamber. A needle valve housing (2) is movably disposed within the first chamber (100). The needle valve housing (2) has a second chamber (200). A secondary fuel injection port (201) and a secondary fuel passage (202) are provided on the side wall of the needle valve housing (2). The secondary fuel passage (202) communicates with the secondary fuel chamber. The secondary fuel injection port (201) is disposed close to the injection passage (101). The needle valve housing (2) has a first blocking position that abuts against a portion of the inner wall of the first chamber (100) to block at least a portion of the injection passage (101). The needle valve housing (2) also has a first clearance position that separates from a portion of the inner wall of the first chamber (100) to allow the injection passage (101) to communicate with the first chamber (100). When the needle valve housing (2) is in the first blocking position, the auxiliary fuel passage (202) can be connected to at least part of the injection passage (101) through the auxiliary fuel injection hole (201).

2. The dual-fuel injector according to claim 1, characterized in that, The dual-fuel injector also includes a needle valve (3), which is movably disposed within the second chamber (200). The needle valve (3) has a second blocking position that abuts against a portion of the inner wall of the second chamber (200) to block at least a portion of the auxiliary fuel injection orifice (201), and a second clearance position that separates from a portion of the inner wall of the second chamber (200) to allow the auxiliary fuel injection orifice (201) to communicate with the second chamber (200). The needle valve housing (2) and the needle valve (3) are independently controlled.

3. The dual-fuel injector according to claim 2, characterized in that, Part of the injection channel (101) includes a first channel (1011) and a second channel (1012). The first channel (1011) and the second channel (1012) are connected. The inner wall of a portion of the first channel (1011) is formed by the nozzle body (1) to form a main fuel through hole (10111). The inner wall of another portion of the first channel (1011) is formed by the nozzle body (1) to form a secondary fuel through hole (10112). The main fuel through hole (10111) and the secondary fuel through hole (10112) are connected in parallel.

4. The dual-fuel injector according to claim 3, characterized in that, When the needle valve housing (2) is in the first blocking position, the geometric center line of the auxiliary fuel injection hole (201) is collinear with the geometric center line of the auxiliary fuel through hole (10112), and / or, the diameter of the auxiliary fuel through hole (10112) is greater than or equal to the diameter of the auxiliary fuel injection hole (201).

5. The dual-fuel injector according to claim 4, characterized in that, The geometric center line of the second channel (1012) is parallel to the geometric center line of the auxiliary fuel through hole (10112), and / or, the geometric center line of the second channel (1012) has an angle α with the geometric center line of the main fuel through hole (10111), where 0≤α≤25°.

6. The dual-fuel injector according to any one of claims 2-5, characterized in that, The dual-fuel injector also includes a transition housing (4), which is connected to the nozzle body (1). The transition housing (4) has a mounting groove (400), one end of which is opposite to one end of the first chamber (100), so that the mounting groove (400) communicates with the first chamber (100).

7. The dual-fuel injector according to claim 6, characterized in that, The dual-fuel injector also includes: Needle valve adjusting component (5), which is movably disposed in the mounting groove (400), has a first limiting boss (500) at one end, and one end of the first limiting boss (500) abuts against the opening end of the needle valve housing (2). The first elastic element (6) is disposed in the mounting groove (400). One end of the first elastic element (6) is connected to the bottom of the mounting groove (400), and the other end of the first elastic element (6) is connected to the other end of the first limiting boss (500). The first elastic element (6) is used to provide the abutment pressure between the first limiting boss (500) and the needle valve housing (2). In this embodiment, a portion of the needle valve adjusting member (5) extends through the opening of the needle valve housing (2) into the second chamber (200), the first limiting boss (500) blocks at least a portion of the second chamber (200), and the first limiting boss (500) blocks at least a portion of the mounting groove (400).

8. The dual-fuel injector according to claim 7, characterized in that, The needle valve (3) includes a drive section (31), a blocking section (32), and an actuation section (33) connected in sequence. The drive section (31) is located near the needle valve adjusting member (5). At least a portion of the outer surface of the blocking section (32) is in contact with the inner surface of the second chamber (200). The actuation section (33) has a second blocking position and a second clearance position at the end away from the needle valve adjusting member (5). The diameter of the blocking section (32) is larger than that of the actuation section (33). 3) The diameter of the blocking section (32) is greater than the diameter of the driving section (31), so that one end of the blocking section (32), one end of the needle valve adjusting member (5) and part of the inner wall of the needle valve housing (2) form a secondary fuel driving chamber (310). At least one of the transition housing (4) and the needle valve housing (2) is provided with a secondary fuel inlet channel (401). The secondary fuel driving chamber (310) is connected to the secondary fuel chamber through the secondary fuel inlet channel (401).

9. The dual-fuel injector according to claim 8, characterized in that, The other end of the blocking section (32) forms a secondary fuel injection chamber (330) with part of the inner wall of the needle valve housing (2). At least one of the transition housing (4) and the needle valve housing (2) is provided with a secondary fuel injection channel (402). A transition channel (320) is provided on the outer surface of the blocking section (32). One end of the transition channel (320) is connected to the secondary fuel injection channel (402), and the other end of the transition channel (320) is connected to the secondary fuel injection chamber (330). The other end of the secondary fuel injection channel (402) is connected to the secondary fuel channel (202).

10. The dual-fuel injector according to claim 8 or 9, characterized in that, The connection between the sealing section (32) and the driving section (31) forms a second limiting boss (300). The dual-fuel injector also includes a second elastic element (7). One end of the second elastic element (7) is connected to the needle valve adjusting element (5), and the other end of the second elastic element (7) is connected to the second limiting boss (300). The second elastic element (7) is used to provide the abutment pressure between the actuating section (33) and the inner wall of the needle valve housing (2).

11. The dual-fuel injector according to claim 10, characterized in that, A first gasket (61) is provided between the first elastic member (6) and the first limiting boss (500). The first gasket (61) is connected to at least one of the first elastic member (6) and the needle valve adjusting member (5). The first elastic member (6) is connected to the first limiting boss (500) through the first gasket (61). And / or, a second gasket (71) is provided between the second elastic member (7) and the second limiting boss (300). The second gasket (71) is connected to at least one of the oil needle valve (3) and the second elastic member (7). The second elastic member (7) is connected to the second limiting boss (300) through the second gasket (71).

12. The dual-fuel injector according to claim 11, characterized in that, The dual-fuel injector also includes a control valve body (8), which is connected to the transition housing (4). The control valve body (8), the transition housing (4), and the nozzle body (1) are provided with a main drive channel (801) that is connected to each other. The control valve body (8) is provided with a drain channel (803). The control valve body (8) includes a main adjustment component (81), which is disposed on either the main drive channel (801) or the drain channel (803). One end of the main drive channel (801) is connected to the mounting groove (400). The other end of the main drive channel (801) has a first working state that is connected to the drain channel (803) and a first pressure stabilizing state that is disconnected from the drain channel (803).

13. The dual-fuel injector according to claim 12, characterized in that, The control valve body (8), the transition housing (4), and the nozzle body (1) are provided with a connected secondary drive channel (802). The control valve body (8) also includes a secondary adjustment component (82). The secondary adjustment component (82) is disposed on either the secondary drive channel (802) or the drain channel (803). One end of the secondary drive channel (802) is connected to the secondary fuel drive chamber (310). The other end of the secondary drive channel (802) has a second working state connected to the drain channel (803) and a second pressure stabilizing state disconnected from the drain channel (803).

14. The dual-fuel injector according to claim 13, characterized in that, The control valve body (8) is also provided with a main fuel inlet (804) and a secondary fuel inlet (805). The outlet end of the main fuel inlet (804) is connected to the first chamber (100) through the main fuel channel (102). The inlet end of the main fuel inlet (804) is connected to the main fuel chamber. The inlet section of the secondary fuel inlet (805) is connected to the secondary fuel chamber. The outlet end of the secondary fuel inlet (805) is connected to the mounting groove (400), the secondary fuel inlet channel (401), and the secondary fuel channel (202).

15. A vehicle, characterized in that, The vehicle has a dual-fuel injector, which is the dual-fuel injector according to any one of claims 1-14.

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