A direct injection engine nozzle

Abstract

The present invention discloses a nozzle hole of a direct injection engine, comprising: a tube body, one end of which is connected to a fuel nozzle of the direct injection engine, and the other end is disposed in a combustion chamber of the direct injection engine for injecting gaseous fuel into the combustion chamber; a plurality of gas guiding bosses disposed on an inner side wall of the tube body to enable the gaseous fuel flowing through the tube body to form a vortex flow state. The present invention can make the gaseous fuel injected into the combustion chamber in a vortex flow state and advance in a vortex, so that the gaseous fuel in the combustion chamber can be fully mixed with air, thereby improving the combustion effect of the direct injection engine, increasing the utilization rate of the gaseous fuel, and further reducing the soot emission generated by incomplete combustion of the direct injection engine and reducing environmental pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of direct injection engines, and particularly to a fuel injection hole of a direct injection engine. Background Art

[0002] The rapid development of industrialization has made traditional energy sources increasingly scarce, and the environmental pollution problem has become more and more serious. Seeking clean and efficient new energy has become a hot issue under the current situation. New fuels such as natural gas are attracting more and more attention from developers. However, compared with traditional liquid fuels, gas fuels, taking natural gas as an example, have a lower density than traditional fuel oils. Therefore, there are usually significant differences between gas fuels and traditional liquid fuels in terms of processing equipment and usage methods.

[0003] For gas fuels, if the traditional intake port injection method is adopted in an engine, it will cause a decrease in the engine's charging efficiency, a slowdown in the combustion flame, a decrease in the heat release rate, and an increase in the combustion duration. As a result, the combustion cycle variation of the engine becomes serious and the power performance decreases. If the in-cylinder direct injection method is adopted in the engine, it will increase the engine's charging efficiency, strengthen the in-cylinder turbulence, and accelerate the combustion rate of the air-fuel mixture, which can improve the power performance and emission characteristics of the engine. However, when gas fuel is directly injected into the engine cylinder at a high pressure, since it does not undergo the processes of fragmentation and evaporation, its rapid expansion process will result in a short penetration distance of the gas fuel jet, thereby causing the mixing rate of the gas fuel and air to slow down. This problem poses a great challenge to the formation of the air-fuel mixture in the engine cylinder and subsequent combustion control. In addition, the gas fuel spray of traditional straight-hole injection in a direct injection engine will generate a strong shock wave, and at the same time, due to the low density of the gas fuel, the momentum of the gas fuel spray is low, which will also hinder the good mixing of the gas fuel and air, resulting in local enrichment of the air-fuel mixture, and then causing incomplete combustion of the gas fuel and generating more soot emissions, polluting the environment. Summary of the Invention

[0004] The purpose of the present invention is to provide a fuel injection hole for a direct injection engine, so that the gas fuel injected into the combustion chamber of the direct injection engine has a vortex flow state, and then can be quickly and evenly mixed with air.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] A fuel injection hole of a direct injection engine, comprising:

[0007] A pipe body, its first end is connected to the fuel nozzle of the direct injection engine, and the second end is arranged in the combustion chamber of the direct injection engine for injecting gas fuel into the combustion chamber;

[0008] A plurality of air guiding bosses are arranged on the inner side wall of the pipe body to make the gaseous fuel flowing through the pipe body form a vortex flow state.

[0009] Preferably, each of the air guiding bosses is fixed to the inner side wall of the pipe body in a spiral shape, and the first end of each air guiding boss is flush with the first end of the pipe body, and the second end of each air guiding boss is flush with the second end of the pipe body.

[0010] Preferably, the spiral angle of each air guiding boss is greater than 45 degrees.

[0011] Preferably, all the air guiding bosses are arranged at intervals along the inner side wall of the pipe body.

[0012] Preferably, the inner side wall of the pipe body and all the air guiding bosses cooperate to form a flow channel; the gaseous fuel flows through the flow channel to form a vortex flow state and is sprayed into the combustion chamber.

[0013] Preferably, the pipe body is a cylindrical hollow pipe, and the material of the pipe body is metal;

[0014] The materials of all the air guiding bosses are all metal.

[0015] Preferably, all the air guiding bosses and the pipe body are integrally arranged.

[0016] Preferably, the number of the air guiding bosses is 2 to 6.

[0017] Compared with the prior art, the present invention has at least one of the following advantages:

[0018] A direct injection engine injection hole provided by the present invention can make the gaseous fuel flowing through the flow channel in the pipe body form a vortex flow state through a plurality of air guiding bosses arranged on the inner side wall of the pipe body, so that the gaseous fuel sprayed into the combustion chamber is in a vortex flow state and advances in a vortex, so as to entrain more air and have a larger surface area contact with the air, and further enable the gaseous fuel and the air in the combustion chamber to be fully mixed.

[0019] In the present invention, during the vortex advance of the gaseous fuel in the combustion chamber in a vortex flow state, the formation of the gaseous fuel spray shock wave can be effectively weakened, and the mixing effect of the gaseous fuel and the air in the combustion chamber is further improved.

[0020] The present invention can also make the gaseous fuel sprayed into the combustion chamber form a plurality of fuel void bands at the extension of the air guiding bosses through the constraint of a plurality of air guiding bosses. By using the characteristic that the fuel void bands are filled with air, the penetration force of the air to the gaseous fuel sprayed into the combustion chamber can be enhanced, and the contact area between the air and the gaseous fuel can be increased, so that the mutual disturbance and entrainment mixing effect of the gaseous fuel and the air in the combustion chamber is further strengthened.

[0021] In the present invention, by fully mixing the gaseous fuel and air in the combustion chamber, the combustion effect of the direct injection engine can be improved, the utilization rate of the gaseous fuel can be increased, the soot emission caused by incomplete combustion of the direct injection engine can be reduced, and thus the environmental pollution can be reduced.

[0022] The structure of the present invention is simple and reliable in operation, and can be applied to the current new type of gaseous fuel direct injection engine, having good popularization and application value. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the overall structure of a direct injection engine nozzle provided by the first embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of a horizontal cross-section of a direct injection engine nozzle provided by the first embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the structure of a flow channel in a direct injection engine nozzle provided by the first embodiment of the present invention;

[0026] Figure 4 is a spray effect diagram of a direct injection engine nozzle provided by the first embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the overall structure of a direct injection engine nozzle provided by the second embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of a vertical cross-section of a direct injection engine nozzle provided by the second embodiment of the present invention;

[0029] Figure 7 is a schematic diagram of a horizontal cross-section of a direct injection engine nozzle provided by the second embodiment of the present invention. Detailed Embodiments

[0030] The following further elaborates on a direct injection engine nozzle proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and all use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features, and advantages of the present invention more obvious and understandable, please refer to the accompanying drawings. It should be known that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0031] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0032] Combined with the attached Figures 1 to 4 As shown, a direct injection engine nozzle provided by the first embodiment includes: a tube body 110, whose first end is connected to the fuel nozzle of the direct injection engine, and the second end is disposed in the combustion chamber of the direct injection engine for injecting gaseous fuel into the combustion chamber; a plurality of air guiding bosses 120 disposed on the inner sidewall of the tube body 110 to form a vortex flow state of the gaseous fuel flowing through the tube body 110.

[0033] Please continue to refer to Figure 1 , each of the air guiding bosses 120 is fixed to the inner sidewall of the tube body 110 in a spiral shape; and the first end of each of the air guiding bosses 120 is flush with the first end of the tube body 110, and the second end of each of the air guiding bosses 120 is flush with the second end of the tube body 110.

[0034] It can be understood that in some other embodiments, the spiral angle of each of the air guiding bosses 120 is greater than 45 degrees.

[0035] Specifically, in this embodiment, the first end of the tube body 110 can be used as the inlet of the gaseous fuel, that is, the gaseous fuel is injected into the first end of the tube body 110 from the fuel nozzle (such as a high-pressure nozzle); the second end of the tube body 110 can be used as the outlet of the gaseous fuel, that is, the gaseous fuel injected into the tube body 110 can be ejected from the second end of the tube body 110 into the combustion chamber. Since the first end of each air guiding boss 120 is flush with the first end of the tube body 110 and the second end of each air guiding boss 120 is flush with the second end of the tube body 110, when the gaseous fuel injected into the tube body 110 flows from the first end of the tube body 110 to the second end of the tube body 120, it will flow through the spirally distributed air guiding bosses 120 and contact the air guiding bosses 120, so that the gaseous fuel can form a vortex flow state. In order to make the vortex flow state formed by the gaseous fuel have a large centrifugal force so that more air can be entrained after the gaseous fuel is ejected into the combustion chamber, the spiral angle of each air guiding boss 120 can be greater than 45 degrees, that is, the angle at which each air guiding boss 120 spirally rotates around the central axis of the tube body 110 and along the inner side wall of the tube body 110 is greater than 45 degrees. Preferably, the spiral angle of each air guiding boss 120 is 180 degrees, but the present invention is not limited thereto.

[0036] Please also refer to Figure 1 and Figure 2 , and all the air guiding bosses 120 are arranged at intervals along the inner side wall of the tube body 110.

[0037] It can be understood that in some other embodiments, all the air guiding bosses 120 are integrally provided with the tube body 110.

[0038] In some embodiments, the number of the air guiding bosses 120 is 2 - 6.

[0039] Specifically, in this embodiment, all the air guiding bosses 120 can be spirally and evenly arranged on the inner side wall of the tube body 110, and any two of the air guiding bosses 120 are parallel. More specifically, the cross-section of each air guiding boss 120 can be rectangular. At the same time, according to the requirement of the flow area of the gaseous fuel in the tube body, the number of the air guiding bosses 120 can be 3, and the height of each air guiding boss 120 can be one-sixth of the inner diameter of the tube body 110, but the present invention is not limited thereto.

[0040] Please also refer to Figure 3 and Figure 4 , and the inner side wall of the tube body 110 and all the air guiding bosses 120 cooperate to form a flow channel 130; the gaseous fuel flows through the flow channel 130 to form a vortex flow state and is ejected into the combustion chamber.

[0041] It can be understood that in some other embodiments, the tube body 110 is a cylindrical hollow tube, and the material of the tube body 110 is metal; the materials of all the air guiding bosses 120 are metal.

[0042] Specifically, in this embodiment, the flow channel 130 is a space formed by the inner side wall of the tube body 110 and the three air guiding bosses 120 for accommodating the gaseous fuel. After the gaseous fuel is ejected from the fuel nozzle and enters the first end of the flow channel 130 and flows towards the second end of the flow channel 130, the gaseous fuel will flow through the air guiding bosses 120; since the air guiding bosses 120 are spirally distributed, the gaseous fuel will form a vortex flow state under the action of the air guiding bosses 120. More specifically, when the gaseous fuel is ejected from the second end of the flow channel 130 into the combustion chamber of the direct injection engine, it will still maintain a vortex flow state. The gaseous fuel ejected into the combustion chamber and in a vortex flow state can generate a centrifugal force during its forward movement, causing the gaseous fuel to be centrifugally radially ejected, so that the gaseous fuel ejected into the combustion chamber can entrain more air and have a larger surface area contact with the air during its vortex forward movement, thereby promoting the full mixing of the gaseous fuel and the air in the combustion chamber, solving the problem of combustion deterioration caused by the local over-concentration phenomenon of the mixture of the gaseous fuel and the air brought about by the traditional injection method, and optimizing the ignition and combustion processes of the direct injection engine. At the same time, the gaseous fuel in the combustion chamber in a vortex flow state can effectively weaken the formation of the gaseous fuel spray shock wave during its vortex forward movement, further improving the mixing effect of the gaseous fuel and the air in the combustion chamber, but the present invention is not limited thereto.

[0043] In addition, when the gaseous fuel is ejected from the second end of the flow channel 130 into the combustion chamber, due to the restraint of the multiple air guiding bosses 120, the gaseous fuel ejected into the combustion chamber can form multiple fuel void bands at the extensions of the air guiding bosses 120, that is, each extension of the air guiding boss 120 corresponds to a fuel void band; the fuel void bands in the combustion chamber itself can be filled with air, thereby enhancing the penetration force of the air to the gaseous fuel ejected into the combustion chamber, and at the same time increasing the contact area between the air and the gaseous fuel ejected into the combustion chamber, further strengthening the mutual disturbance and entrainment mixing effect of the gaseous fuel and the air in the combustion chamber, but the present invention is not limited thereto.

[0044] Combined with the attached Figures 5 to 7As shown, a fuel injection hole of a direct injection engine provided by the second embodiment has substantially the same overall structure as that of a fuel injection hole of a direct injection engine provided by the first embodiment. Only the differences between the fuel injection hole of a direct injection engine provided by the second embodiment and the first embodiment will be introduced below. For the same parts of other structures and their beneficial effects, reference can be made to the first embodiment.

[0045] Specifically, in this example, the number of the air guiding bosses 120 is 4, and the cross section of each air guiding boss 120 is semi-circular. The radius of each air guiding boss 120 is one-sixth of the inner diameter of the pipe body 110, but the present invention is not limited thereto.

[0046] For other content not described in the second embodiment, reference can be made to the relevant content of the first embodiment.

[0047] In other embodiments, the cross section of the air guiding boss 120 can also be triangular, square, etc., but the present invention is not limited thereto.

[0048] In summary, for a fuel injection hole of a direct injection engine provided by each of the above embodiments, gaseous fuel can be injected into the combustion chamber of the direct injection engine through the pipe body. A plurality of air guiding bosses provided on the inner side wall of the pipe body can make the gaseous fuel flowing through the inner flow channel of the pipe body form a vortex flow state, so that the gaseous fuel injected into the combustion chamber is in a vortex flow state and advances in a vortex, thereby enabling the gaseous fuel in the combustion chamber to be fully mixed with air, improving the combustion effect of the direct injection engine, increasing the utilization rate of the gaseous fuel, reducing the soot emission generated by incomplete combustion of the direct injection engine, and reducing environmental pollution.

[0049] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and substitutions of the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A direct injection engine nozzle hole, characterized in that Comprising: A tube body (110), whose first end is connected to a fuel nozzle of a direct injection engine, and whose second end is disposed in a combustion chamber of the direct injection engine for injecting gaseous fuel into the combustion chamber; A plurality of air guiding bosses (120) disposed on an inner side wall of the tube body (110) to enable the gaseous fuel flowing through the tube body (110) to form a vortex flow state; Each of the air guiding bosses (120) is spirally fixed on the inner side wall of the tube body (110), and a first end of each of the air guiding bosses (120) is flush with the first end of the tube body (110), and a second end of each of the air guiding bosses (120) is flush with the second end of the tube body (110); A spiral angle of each of the air guiding bosses (120) is greater than 45 degrees; The inner side wall of the tube body (110) and all the air guiding bosses (120) cooperate to form a flow channel (130); the gaseous fuel flows through the flow channel (130) to form a vortex flow state and is injected into the combustion chamber.

2. The direct injection engine nozzle according to claim 1, wherein All the air guiding bosses (120) are spaced apart along the inner side wall of the tube body (110).

3. The direct injection engine nozzle according to claim 1, wherein The tube body (110) is a cylindrical hollow tube, and the material of the tube body (110) is metal; The materials of all the air guiding bosses (120) are all metal.

4. The direct injection engine nozzle according to claim 1, wherein All the air guiding bosses (120) are integrally provided with the tube body (110).

5. The direct injection engine nozzle according to any one of claims 1 to 4, wherein The number of the air guiding bosses (120) is 2 to 6.

Images