A gas engine nozzle, design method, multi-point injection system and vehicle

Abstract

The application discloses a gas engine nozzle and a design method thereof, a spraying system and a vehicle, and relates to the field of engines. The nozzle comprises an air inlet pipe, which comprises an air inlet section and a jet section. One end of the air inlet section is used for being connected with a natural gas long rail guide pipe, and the other end is used for extending into an air inlet manifold from a direction perpendicular to the air inlet manifold wall. The jet section is at a preset angle with the air inlet section. A nozzle end of the jet section is used for extending into a cylinder air inlet channel, and is axially spaced apart from a front nozzle hole group and a rear nozzle hole group. The front nozzle hole group comprises a plurality of front nozzle holes, and the rear nozzle hole group comprises a plurality of rear nozzle holes. The jetting directions of the front nozzle holes and the rear nozzle holes are at a set angle with the axis of the jet section, and are away from each other. In the second aspect, a system comprising the nozzle is provided. By setting the air inlet section and the jet section at a set angle, natural gas can flow into the cylinder air inlet channel better. By setting the front nozzle holes and the rear nozzle holes with different directions at the nozzle end of the jet section, the spraying area of the natural gas is increased.

Description

Technical Field

[0001] This invention relates to the field of engine technology, specifically to a gas engine nozzle, design method, injection system, and vehicle. Background Technology

[0002] With the increasing severity of the energy crisis and environmental pollution, both domestic and international efforts are actively developing various energy-saving and emission-reduction technologies. Natural gas, with its high calorific value, clean combustion, and abundant reserves, has become a new generation of alternative energy source. Among these, lean combustion, due to its low combustion temperature, can effectively reduce NOx emissions, making it an important emission reduction technology. However, as the air-fuel mixture becomes leaner, the engine's cycle fluctuations intensify, and even when the engine is operating near the lean-burn limit, partial combustion or misfire may occur. This leads to a significant increase in HC and CO in the exhaust gas. Cycle fluctuations become a major obstacle affecting the lean-burn limit. Therefore, rationally organizing the intake and combustion processes and improving combustion quality are crucial to fully realizing the energy-saving and emission-reduction capabilities of lean-burn natural gas engines.

[0003] Currently, among advanced engines both domestically and internationally, electronically controlled multi-point injection is commonly used for fuel supply in lean-burn natural gas engines. Existing technologies also improve the mixing of natural gas and air, as well as the uniformity of fuel distribution across cylinders, by modifying the intake structure and employing an intake manifold.

[0004] However, adopting an intake manifold requires significant modifications to the existing engine intake system, resulting in higher costs. Furthermore, it does not achieve optimal mixing of natural gas and air, leading to slower engine response. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this invention is to provide a gas engine nozzle, design method, injection system and vehicle to solve the problem of incomplete combustion in the prior art gas engine, and the fact that adopting an intake manifold requires a large modification to the existing engine intake system, which is costly.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, this application provides a gas engine nozzle, comprising: The intake pipe includes an intake section and an injection section. One end of the intake section is used to connect to the natural gas long rail duct, and the other end is used to extend into the intake manifold from a direction perpendicular to the manifold wall. The injection section forms a preset angle with the intake section. The nozzle end of the injection section is used to extend into the cylinder intake passage. A front injection hole group and a rear injection hole group are provided axially at intervals. The front injection hole group includes multiple front injection holes, and the rear injection hole group includes multiple rear injection holes. The ejection directions of the front injection holes and the ejection directions of the rear injection holes form a preset angle with the axis of the injection section and are far apart from each other.

[0007] In some alternative embodiments, the jet section extends a predetermined length into the cylinder intake passage.

[0008] In some optional embodiments, the ejection direction of the front nozzle forms a first predetermined angle with the axis of the jet section, and the ejection direction of the rear nozzle forms a second predetermined angle with the axis of the jet section, wherein the second predetermined angle is greater than the first predetermined angle.

[0009] In some alternative embodiments, the aforementioned jet section coincides with the axis of the aforementioned intake manifold.

[0010] Secondly, this application also provides a method for designing a gas engine nozzle, for designing any of the above-mentioned gas engine nozzles, comprising the following steps: Determine the preset angle between the intake section and the jet section based on the slope of the intake manifold wall; Based on the preset angle between the air intake section and the jet section, the angle between the ejection direction of the front nozzle and the ejection direction of the rear nozzle and the axis of the aforementioned jet section is determined.

[0011] In some optional embodiments, the preset angle between the intake section and the jet section is determined based on the slope of the intake manifold wall, including: The preset included angle β is determined by β=A+90°, where A is the slope of the intake manifold wall.

[0012] In some optional embodiments, the angle between the ejection direction of the front nozzle and the ejection direction of the rear nozzle and the axis of the jet section is determined according to a preset angle between the intake section and the jet section, including: The first included angle γ1 is determined by γ1 = β / 2.

[0013] Thirdly, this application also provides a multi-point injection system, comprising: Multiple cylinder intake manifolds, which are used to connect the cylinders to the intake manifold; The intake pipes are the same number as and correspond one-to-one with the intake passages of the cylinders. Each intake pipe includes an intake section and an injection section. One end of the intake section is connected to the natural gas long rail duct, and the other end extends into the intake manifold. The injection section forms a preset angle with the intake section. The nozzle end of the injection section extends into the intake passage of the cylinders and is provided with a front injection hole group and a rear injection hole group at axial intervals. The front injection hole group includes multiple front injection holes, and the rear injection hole group includes multiple rear injection holes. The ejection directions of the front injection holes and the ejection directions of the rear injection holes form a preset angle with the axis of the injection section and are far apart from each other.

[0014] In some optional embodiments, the gas outlets are spaced at intervals twice the number of the inlet pipes on the aforementioned natural gas long rail duct, and each of the aforementioned inlet pipes is connected to the natural gas long rail duct via a hybrid integrated assembly, the aforementioned hybrid integrated assembly comprising: Two injection valves, whose inlet ends are connected to the two outlets mentioned above, are used to control the ejection of natural gas from the natural gas long rail duct. A mixing integrator is connected to the exhaust end of the aforementioned injection valve, and the intake section of the aforementioned intake pipe is connected to the aforementioned mixing integrator.

[0015] Fourthly, this application also provides a vehicle including any of the aforementioned multi-point injection systems.

[0016] Compared with the prior art, the advantages of this invention are as follows: by setting the ejection directions of the front and rear nozzles to form a set angle with the axis of the jet section and to be far apart from each other, when natural gas is ejected from the nozzles, it is ejected in a fan shape, with a larger ejection area than the single-direction nozzles in the prior art, which is more conducive to mixing with air; each cylinder intake port is equipped with a gas engine nozzle and a set of mixing integration components, thereby achieving better uniformity among cylinders in the middle of the intake manifold, improving the responsiveness and uniformity of the intake, and reducing losses along the way; only the natural gas intake part is improved, while the main structure of the natural gas engine is not significantly modified, thus it is more economical and has lower maintenance costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a side-view perspective view of the installation of a gas engine nozzle according to the present invention; Figure 2 A schematic diagram showing the installation location of the gas engine nozzle; Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the central air intake pipe; Figure 4 for Figure 3 A partial schematic diagram of the mid-jet section; Figure 5 This is a front view schematic diagram of the injection system of the present invention.

[0019] In the diagram: 10. Intake pipe; 1. Intake section; 2. Injection section; 21. Front injection port; 22. Rear injection port; 3. Exhaust gas intake pipe; 4. Mixing integrated assembly; 41. Injection valve; 42. Mixing integrator; 5. Natural gas long rail duct; 6. Main intake pipe; 7. Cylinder intake passage; 8. Front intake pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Firstly, such as Figures 1 to 4 As shown, this application provides a gas engine nozzle, including an intake pipe 10, which is used to introduce natural gas into the cylinder intake passage 7, thereby achieving better uniformity of each cylinder and good mixing of natural gas and air in the middle of the intake manifold 6.

[0023] Specifically, the intake pipe 10 includes an intake section 1 and an injection section 2. One end of the intake section 1 is used to connect to the natural gas long rail duct 5, and the other end is used to extend into the intake manifold 6 in a direction perpendicular to the wall of the intake manifold 6. The injection section 2 forms a preset angle with the intake section 1. The nozzle end of the injection section 2 is used to extend into the cylinder intake passage 7, and a front injection hole group and a rear injection hole group are provided axially. The front injection hole group includes a plurality of front injection holes 21, and the rear injection hole group includes a plurality of rear injection holes 22. The ejection direction of the front injection holes 21 and the ejection direction of the rear injection holes 22 form a preset angle with the axis of the injection section 2 and are far apart from each other.

[0024] It is understood that the intake pipe 10 in this embodiment is a bent pipe, with the intake section 1 and the jet section 2 forming a preset angle, which facilitates the flow of natural gas within the pipe while satisfying the structural arrangement requirements. Simultaneously, the ejection directions of the front jet hole 21 and the rear jet hole 22 form a set angle with the axis of the jet section 2 and are far apart from each other. Thus, when natural gas is ejected from the jet holes, it is ejected in a fan shape, with a larger ejection area than that of single-direction jet holes in the prior art, which is more conducive to mixing with air.

[0025] Meanwhile, because the intake manifold 6 has a flared structure, the opening size of its connection with the front intake pipe 8 is smaller than the opening size of its connection with the cylinder intake passage 7. Therefore, when the intake section 1 passes through the side wall of the intake manifold 6 and extends into the intake manifold 6, it is perpendicular to the pipe wall of the intake manifold 6, which is more conducive to the stability of the connection between the intake manifold 6 and the intake section 1.

[0026] Optionally, the front nozzles 21 and rear nozzles 22 are evenly spaced along the circumference, and multiple sets of front and rear nozzle groups are provided along the axial direction of the jet section 2. In this example, two sets of front and rear nozzle groups are provided. In other embodiments, the number of front and rear nozzle groups can be increased according to the engine power and the required air intake, which will not be elaborated here.

[0027] It should be noted that the intake section 1 and the jet section 2 are at a preset angle, which is an obtuse angle, thus making it more conducive to the flow of natural gas in the pipe.

[0028] In some alternative embodiments, the jet section 2 extends a predetermined length into the cylinder intake passage 7.

[0029] In this example, one-third of the jet section 2 is located inside the intake manifold 6, and two-thirds of the jet section 2 extends into the cylinder intake manifold 7. The purpose of this arrangement is to ensure that the natural gas is injected into the cylinder intake manifold 7 as much as possible and mixes with the air.

[0030] The table below shows a comparison of engine efficiency when two sets of front nozzles and two sets of rear nozzles are arranged, with different numbers of nozzles and different lengths of jet section 2 in each set. As can be seen from the figure, the engine achieves the highest thermal efficiency when each set includes 8 nozzles and the length of jet section 2 is 120mm.

[0031]

[0032] In some optional embodiments, the ejection direction of the front nozzle 21 forms a first predetermined angle with the axis of the jet section 2, and the ejection direction of the rear nozzle 22 forms a second predetermined angle with the axis of the jet section 2, wherein the second predetermined angle is greater than the first predetermined angle.

[0033] It is understandable that the rear nozzle 22 is further away from the opening where the cylinder intake passage 7 connects to the intake manifold 6. Therefore, in order to better mix the natural gas ejected from the rear nozzle 22 with the air in the intake manifold 6, the second set angle is made larger than the first set angle, so that the coverage area of ​​the injected gas is closer to the opening where the cylinder intake passage 7 connects to the intake manifold 6. At the same time, if the second set angle is too small, it will also cause an un-sprayed "blank area" to be formed between the coverage areas of the gas ejected from the rear nozzle 22 and the front nozzle 21, which is not conducive to the mixing of natural gas and air.

[0034] Of course, the second set angle mentioned above should not be too large, and is preferably an acute angle.

[0035] In some alternative embodiments, the axis of the jet section 2 coincides with that of the intake manifold 6.

[0036] It is understandable that by aligning the axis of the jet section 2 with that of the intake manifold 6, the nozzle end is located at the axis of the intake manifold 7 when it is inserted into the cylinder intake manifold 7. In this way, the front jet hole 21 and the rear jet hole 22, which are spaced apart along the circumference, can spray natural gas evenly.

[0037] Secondly, this application also provides a design method for a gas engine nozzle, used to design any of the above-mentioned gas engine nozzles, comprising the following steps: S1: Determine the preset angle between the intake section 1 and the jet section 2 based on the slope of the intake manifold 6.

[0038] Specifically, the preset included angle β is determined according to β=A+90°, where A is the slope of the intake manifold 6.

[0039] It is understandable that, due to the flared structure of the intake manifold 6, the opening size connecting it to the front intake pipe 8 is smaller than the opening size connecting it to the cylinder intake passage 7. Therefore, when the intake section 1 passes through the side wall of the intake manifold 6 and extends into the intake manifold 6, it is perpendicular to the wall of the intake manifold 6. The angle between the wall of the intake manifold 6 and the perpendicular line to the axis of the exhaust gas intake pipe 3 is the slope of the wall of the intake manifold 6, and the slope of the wall of the intake manifold 6 is equal to the inclination angle of the intake section 1. Here, the inclination angle of the intake section 1 refers to the angle between the intake section 1 and the vertical plane.

[0040] Therefore, the aforementioned preset included angle β is an obtuse angle.

[0041] S2: Based on the preset angle between the air intake section 1 and the jet section 2, determine the angle between the ejection direction of the front nozzle 21 and the ejection direction of the rear nozzle 22 and the axis of the jet section 2.

[0042] Specifically, the first included angle γ1 is determined based on γ1=β / 2.

[0043] Preferably, the ejection direction of the rear nozzle 22 forms a second predetermined angle with the axis of the jet section 2, and the second predetermined angle is greater than the first predetermined angle, i.e., γ1 > γ2.

[0044] It is understandable that the rear nozzle 22 is further away from the opening where the cylinder intake passage 7 connects to the intake manifold 6. Therefore, in order to better mix the natural gas ejected from the rear nozzle 22 with the air in the intake manifold 6, the second set angle is made larger than the first set angle, so that the coverage area of ​​the injected gas is closer to the opening where the cylinder intake passage 7 connects to the intake manifold 6. At the same time, if the second set angle is too small, it will also cause an un-sprayed "blank area" to be formed between the coverage areas of the gas ejected from the rear nozzle 22 and the front nozzle 21, which is not conducive to the mixing of natural gas and air.

[0045] Since γ1 = β / 2 > γ2, both γ1 and γ2 are acute angles.

[0046] In some alternative embodiments, the sum of the cross-sectional areas of all the front nozzles 21 and the rear nozzles 22 should be less than half the cross-sectional area of ​​the jet section 2. This arrangement is intended to ensure sufficient injection pressure to eject natural gas.

[0047] In some alternative embodiments, the length of the jet section 2 is determined based on the slope of the intake manifold 6.

[0048] Specifically, the length L of the jet section 2 is determined according to L=1 / 3•a-(a-2a•tanA) / 2•tanA+2 / 3•d, where a is the length of the intake manifold 6 along the axis of the jet section 2, and d is the intake passage length of the cylinder intake passage 7.

[0049] Understandably, in this example, one-third of the jet section 2 is located inside the intake manifold 6, and two-thirds of the jet section 2 extends into the cylinder intake manifold 7. The purpose of this arrangement is to ensure that the natural gas is injected into the cylinder intake manifold 7 as much as possible and mixes with the air.

[0050] Thirdly, this application also provides a multi-point injection system, including the aforementioned gas engine nozzle, multiple cylinder intake ports 7, intake manifold 6, and natural gas long rail duct 5.

[0051] Specifically, multiple cylinder intake passages 7 are used to connect the cylinders to the intake manifold 6; the number of intake pipes 10 is the same as the number of cylinder intake passages 7 and they correspond one-to-one. The intake pipe 10 includes an intake section 1 and an injection section 2. One end of the intake section 1 is connected to the natural gas long rail duct 5, and the other end extends into the intake manifold 6. The injection section 2 forms a preset angle with the intake section 1. The nozzle end of the injection section 2 extends into the cylinder intake passage 7, and a front injection hole group and a rear injection hole group are provided axially. The front injection hole group includes multiple front injection holes 21, and the rear injection hole group includes multiple rear injection holes 22. The ejection direction of the front injection holes 21 and the ejection direction of the rear injection holes 22 form a preset angle with the axis of the injection section 2 and are far apart from each other.

[0052] It can be understood that the engine nozzle injects natural gas from the natural gas long rail duct 5 into the cylinder intake manifold 7, and the cylinder intake manifold 7 is connected to the intake manifold 6. That is to say, part of the exhaust gas is introduced from the exhaust gas intake pipe 3 through EGR (Exhaust Gas Recirculation) to utilize the waste heat of the exhaust gas, reduce energy consumption, and mix with fresh air, and enter the intake manifold 6 together, and then enter the cylinder intake manifold 7, where it is fully mixed with the natural gas injected at the inlet of the cylinder intake manifold 7.

[0053] In this example, the intake pipe 10 is a bent pipe, and the intake section 1 and the jet section 2 form a predetermined angle, which facilitates the flow of natural gas within the pipe while satisfying the structural layout requirements. Simultaneously, the ejection directions of the front nozzle 21 and the rear nozzle 22 form a predetermined angle with the axis of the jet section 2 and are far apart from each other. Thus, when natural gas is ejected from the nozzles, it is ejected in a fan shape, with a larger ejection area than that of single-direction nozzles in existing technologies, which is more conducive to mixing with air.

[0054] Meanwhile, because the intake manifold 6 has a flared structure, the opening size of its connection with the front intake pipe 8 is smaller than the opening size of its connection with the cylinder intake passage 7. Therefore, when the intake section 1 passes through the side wall of the intake manifold 6 and extends into the intake manifold 6, it is perpendicular to the pipe wall of the intake manifold 6, which is more conducive to the stability of the connection between the intake manifold 6 and the intake section 1.

[0055] Optionally, the front nozzles 21 and rear nozzles 22 are evenly spaced along the circumference, and multiple sets of front and rear nozzle groups are provided along the axial direction of the jet section 2. In this example, two sets of front and rear nozzle groups are provided. In other embodiments, the number of front and rear nozzle groups can be increased according to the engine power and the required air intake, which will not be elaborated here.

[0056] It should be noted that the intake section 1 and the jet section 2 are at a preset angle, which is an obtuse angle, thus making it more conducive to the flow of natural gas in the pipe.

[0057] In some alternative embodiments, the gas outlets are spaced apart on the gas long rail duct 5 in a number twice that of the gas inlet pipes 10. Each of the gas inlet pipes 10 is connected to the gas long rail duct 5 through a mixing integration assembly 4, which includes two injection valves 41 and a mixing integrator 42.

[0058] Specifically, the inlet ends of the two injection valves 41 are connected to the two outlets mentioned above to control the ejection of natural gas from the natural gas long rail duct 5; the mixing integrator 42 is connected to the exhaust end of the injection valves 41, and the inlet section 1 of the inlet pipe 10 is connected to the mixing integrator 42.

[0059] In other words, each cylinder intake manifold 7 is equipped with a gas engine nozzle and a set of mixing integration components 4, which can achieve better uniformity of each cylinder in the middle of the intake manifold 6, and improve the responsiveness and uniformity of intake, and reduce losses along the way.

[0060] The design of two injection valves 41 improves the injection efficiency of natural gas.

[0061] It should be noted that the outlet of the natural gas long rail duct 5 can be opened in pairs, depending on the installation position of the two injection valves 41.

[0062] In this example, the natural gas long rail duct 5 is approximately 700-1000 mm long, and a pressure sensor is installed inside the natural gas long rail duct 5 to monitor the natural gas pressure inside the natural gas long rail duct 5 and is connected to the injection valve 41 via a signal connection.

[0063] In some alternative embodiments, the jet section 2 extends a predetermined length into the cylinder intake passage 7.

[0064] In this example, one-third of the jet section 2 is located inside the intake manifold 6, and two-thirds of the jet section 2 extends into the cylinder intake manifold 7. The purpose of this arrangement is to ensure that the natural gas is injected into the cylinder intake manifold 7 as much as possible and mixes with the air.

[0065] The table below shows a comparison of engine efficiency when two sets of front nozzles and two sets of rear nozzles are arranged, with different numbers of nozzles and different lengths of jet section 2 in each set. As can be seen from the figure, the engine achieves the highest thermal efficiency when each set includes 8 nozzles and the length of jet section 2 is 120mm.

[0066]

[0067] In some optional embodiments, the ejection direction of the front nozzle 21 forms a first predetermined angle with the axis of the jet section 2, and the ejection direction of the rear nozzle 22 forms a second predetermined angle with the axis of the jet section 2, wherein the second predetermined angle is greater than the first predetermined angle.

[0068] It is understandable that the rear nozzle 22 is further away from the opening where the cylinder intake passage 7 connects to the intake manifold 6. Therefore, in order to better mix the natural gas ejected from the rear nozzle 22 with the air in the intake manifold 6, the second set angle is made larger than the first set angle, so that the coverage area of ​​the injected gas is closer to the opening where the cylinder intake passage 7 connects to the intake manifold 6. At the same time, if the second set angle is too small, it will also cause an un-sprayed "blank area" to be formed between the coverage areas of the gas ejected from the rear nozzle 22 and the front nozzle 21, which is not conducive to the mixing of natural gas and air.

[0069] Of course, the second set angle mentioned above should not be too large, and is preferably an acute angle.

[0070] In some alternative embodiments, the axis of the jet section 2 coincides with that of the intake manifold 6.

[0071] It is understandable that by aligning the axis of the jet section 2 with that of the intake manifold 6, the nozzle end is located at the axis of the intake manifold 7 when it is inserted into the cylinder intake manifold 7. In this way, the front jet hole 21 and the rear jet hole 22, which are spaced apart along the circumference, can spray natural gas evenly.

[0072] In some alternative embodiments, the jet section 2 of the gas engine nozzle extends a predetermined length into the cylinder intake passage 7.

[0073] In this example, the extended length is set to be two-thirds of its own length.

[0074] Thirdly, this application also provides a vehicle including any of the above-mentioned multi-point injection systems.

[0075] Specifically, it includes the aforementioned gas engine nozzle, multiple cylinder intake passages 7, intake manifold 6, and natural gas long rail duct 5. Multiple cylinder intake passages 7 connect the cylinders to the intake manifold 6; the number of intake pipes 10 is the same as and corresponds one-to-one with the aforementioned cylinder intake passages 7. Each intake pipe 10 includes an intake section 1 and a jet section 2. One end of the intake section 1 is connected to the natural gas long rail duct 5, and the other end extends into the intake manifold 6. The jet section 2 forms a predetermined angle with the intake section 1. The nozzle end of the jet section 2 extends into the cylinder intake passage 7, and a front jet hole group and a rear jet hole group are provided axially at intervals. The front jet hole group includes multiple front jet holes 21, and the rear jet hole group includes multiple rear jet holes 22. The ejection directions of the front jet holes 21 and the rear jet holes 22 form a predetermined angle with the axis of the jet section 2 and are far apart from each other.

[0076] The present invention discloses a gas engine nozzle, design method, injection system, and vehicle. By setting the ejection directions of the front nozzle 21 and the rear nozzle 22 to form a set angle with the axis of the injection section 2 and to be far apart from each other, when natural gas is ejected from the nozzle, the natural gas is ejected in a fan shape, with a larger ejection area than the single-direction nozzles in the prior art, which is more conducive to mixing with air. Each cylinder intake port 7 is equipped with a gas engine nozzle and a set of mixing integration components 4, thereby achieving better cylinder uniformity in the middle of the intake manifold 6, improving the responsiveness and uniformity of the intake, and reducing losses along the way. Only the natural gas intake part is improved, while the main structure of the natural gas engine is not significantly modified, thus making it more economical and reducing maintenance costs.

[0077] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0078] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0079] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A gas engine nozzle, characterized in that, include: The intake pipe (10) includes an intake section (1) and a jet section (2). One end of the intake section (1) is used to connect to the natural gas long rail duct (5), and the other end is used to extend into the intake manifold (6) from a direction perpendicular to the wall of the intake manifold (6). The jet section (2) forms a preset angle with the intake section (1). The nozzle end of the jet section (2) is used to extend into the cylinder intake passage (7). A front jet hole group and a rear jet hole group are provided at axial intervals. Along the gas flow direction in the jet section (2), the front jet hole group is located upstream of the rear jet hole group. The front jet hole group includes multiple front jet holes (21), and the rear jet hole group includes multiple rear jet holes (22). The ejection direction of the front jet hole (21) and the ejection direction of the rear jet hole (22) form a preset angle with the axis of the jet section (2) and are far apart from each other. The ejection direction of the front nozzle (21) forms a first set angle with the axis of the jet section (2), and the ejection direction of the rear nozzle (22) forms a second set angle with the axis of the jet section (2), wherein the second set angle is greater than the first set angle. The jet section (2) coincides with the axis of the intake manifold (6).

2. The gas engine nozzle as described in claim 1, characterized in that, The jet section (2) extends a set length into the cylinder intake passage (7).

3. A method for designing a gas engine nozzle, characterized in that, The method for designing a gas engine nozzle as described in claim 1 or 2 includes the following steps: Based on the slope of the intake manifold (6), determine the preset angle between the intake section (1) and the jet section (2); Based on the preset angle between the air intake section (1) and the jet section (2), the angle between the ejection direction of the front nozzle (21) and the ejection direction of the rear nozzle (22) and the axis of the jet section (2) is determined.

4. The design method as described in claim 3, characterized in that, Based on the slope of the intake manifold (6), the preset angle between the intake section (1) and the jet section (2) is determined, including: The preset included angle β is determined according to β=A+90°, where A is the slope of the pipe wall of the intake manifold (6).

5. The design method as described in claim 4, characterized in that, Based on the preset angle between the air intake section (1) and the jet section (2), the angle between the ejection direction of the front nozzle (21) and the ejection direction of the rear nozzle (22) and the axis of the jet section (2) is determined, including: The first set included angle γ1 is determined based on γ1=β / 2.

6. A multi-point injection system, characterized in that, include: Multiple cylinder intake passages (7) are used to connect the cylinders to the intake manifold (6); The intake pipes (10) are the same number as the cylinder intake passages (7) and correspond one-to-one. The intake pipes (10) include an intake section (1) and a jet section (2). One end of the intake section (1) is connected to the natural gas long rail duct (5), and the other end extends into the intake manifold (6). The jet section (2) forms a preset angle with the intake section (1). The nozzle end of the jet section (2) extends into the cylinder intake passage (7) and is provided with a front jet hole group and a rear jet hole group at axial intervals. Along the gas flow direction in the jet section (2), the front jet hole group is located upstream of the rear jet hole group. The front jet hole group includes multiple front jet holes (21), and the rear jet hole group includes multiple rear jet holes (22). The jet direction of the front jet hole (21) and the jet direction of the rear jet hole (22) form a preset angle with the axis of the jet section (2) and are far apart from each other. The ejection direction of the front nozzle (21) forms a first set angle with the axis of the jet section (2), and the ejection direction of the rear nozzle (22) forms a second set angle with the axis of the jet section (2), wherein the second set angle is greater than the first set angle. The jet section (2) coincides with the axis of the intake manifold (6).

7. The multi-point injection system as described in claim 6, characterized in that, The natural gas long rail duct (5) is provided with outlets spaced at intervals twice the number of inlet pipes (10). Each inlet pipe (10) is connected to the natural gas long rail duct (5) through a hybrid integration assembly (4). The hybrid integration assembly (4) includes: Two injection valves (41) are connected to the two outlets respectively, and are used to control the injection of natural gas in the natural gas long rail duct (5); The mixing integrator (42) is connected to the exhaust end of the injection valve (41), and the intake section (1) of the intake pipe (10) is connected to the mixing integrator (42).

8. A vehicle, characterized in that, Including the multi-point injection system as described in claim 6 or 7.

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