Flow mixing nozzle for atomizing high-viscosity fuel

Abstract

The utility model relates to a flow mixing nozzle for atomizing high viscosity fuel, which comprises a nozzle bottom component, a nozzle body and a liquid fuel inlet pipe, the nozzle bottom component is in a blind pipe shape, the nozzle body is in a pipe shape, the head end of the nozzle bottom component is connected with the tail end of the nozzle body, and a spraying hole is arranged in the center of the tail end of the nozzle bottom component. The liquid fuel inlet pipe is coaxially located in the nozzle bottom component and the nozzle body and detachably connected to the head end of the nozzle body through a clamping sleeve connector, and a gap is reserved between the outlet end of the liquid fuel inlet pipe and the inner wall of the tail end of the nozzle bottom component to form a mixing chamber. An annular cavity is formed among the outer wall of the liquid fuel inlet pipe, the nozzle bottom component and the inner wall of the nozzle body, and an auxiliary working medium inlet communicated with the annular cavity is formed in the side wall of the nozzle body. The liquid fuel atomization device is simple in structure, easy to manufacture, capable of effectively atomizing liquid fuels with different viscosities, particularly capable of atomizing liquid fuels with high viscosities, high in atomization efficiency and low in atomization cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel atomization of internal combustion engines, and in particular relates to a flow mixing nozzle for atomizing high-viscosity fuel. Background Art

[0002] The atomization of liquid fuels has a significant impact on the environment and energy utilization. To meet increasingly stringent emissions regulations and improve energy efficiency, research on liquid fuels and their atomization technologies has received increasing attention, and numerous achievements have been made. For example, utility model patent publication number CN221452958U discloses a heavy oil feed atomizing nozzle comprising a nozzle tube, one end of which is provided with a nozzle body, the other end of which is provided with an air inlet pipe, an oil inlet pipe disposed at an angle at the top end of the nozzle tube, and an external solenoid valve disposed on the outside of the oil inlet pipe. A rotating scraping structure is disposed within the nozzle tube, comprising a connecting tube mounted at one end of the air inlet pipe and communicating with the air inlet pipe, and a rotating outlet pipe disposed at the other end of the connecting tube, the surface of which is provided with multiple outlet holes. This atomizing nozzle can evenly mix steam and heavy oil, scrape off heavy oil adhering to the inner wall of the oil pipe, avoiding the problem of difficult cleaning and waste of heavy oil. Furthermore, the amount of steam entering can be controlled to achieve the purpose of adjusting the mixing and atomization effect. For example, the utility model patent with publication number CN217178504U discloses a fuel atomizing nozzle comprising an outer sleeve and an inner sleeve coaxially mounted within the outer sleeve. The outer sleeve has a front end provided with a boost nozzle that slides in a forward-backward direction. The rear end outer wall of the inner sleeve is provided with a plurality of axially extending annular grooves circumferentially. The annular grooves and the inner wall of the outer sleeve form a vent for the passage of the gas phase medium. The rear end of the inner sleeve is a liquid inlet, and the front end is a liquid outlet. An annular cavity connected to the vent is formed between the inner sleeve and the outer sleeve. The outer sleeve has a mixing chamber located at the front end of the liquid outlet. The annular cavity is connected to the boost nozzle through the mixing chamber. The inner diameter of the boost nozzle gradually increases from the rear end to the front end. By using the above technical solution, the atomizing nozzle can change the nozzle head and simplify the internal structure design of the nozzle, thereby increasing the space occupied by the gas-liquid two-phase medium within the nozzle and increasing the nozzle spray volume. The above technologies each have their own characteristics and are suitable for different adaptive occasions. However, the viscosity of liquid fuel (such as fuel oil) is not fixed. Liquid fuels of different types, sources or batches have different viscosities. The above-mentioned atomizing nozzle has a fixed structure and can only atomize liquid fuels with viscosities within a certain range. For liquid fuels with viscosities exceeding the range, especially high-viscosity liquid fuels, it cannot achieve a good atomization effect and it is difficult to achieve the expected atomization effect for the liquid fuel. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides a flow mixing nozzle for atomizing high-viscosity fuel, which has a simple structure and can atomize liquid fuels of different viscosities, especially high-viscosity liquid fuels.

[0004] The technical solution for achieving the above-mentioned purpose of the utility model is: a flow mixing nozzle for atomizing high-viscosity fuel, comprising a nozzle bottom component, a nozzle main body and a liquid fuel inlet pipe, the nozzle bottom component being in the shape of a blind tube with an open head end and a closed tail end, the nozzle main body being in the shape of a tube with open ends, the head end of the nozzle bottom component being connected to the tail end of the nozzle main body, a spray hole being provided at the center of the tail end of the nozzle bottom component, the outer diameter of the liquid fuel inlet pipe being smaller than the inner diameter of the nozzle bottom component and the nozzle main body, the liquid fuel inlet pipe extending into the nozzle bottom component and the nozzle main body, and being coaxially fixedly connected to the nozzle main body, an annular cavity being formed between the outer wall of the liquid fuel inlet pipe and the inner wall of the nozzle bottom component and the nozzle main body, an auxiliary working medium inlet being connected to the annular cavity being provided on the side wall of the nozzle main body, a distance being left between the outlet end of the liquid fuel inlet pipe and the inner wall of the tail end of the nozzle bottom component, forming a mixing area for the fuel and the auxiliary working medium.

[0005] Preferably, the liquid fuel inlet pipe is detachably fixedly connected to the head end of the nozzle body through a ferrule joint.

[0006] Preferably, the ferrule joint is threadedly connected to the head end of the nozzle body.

[0007] Preferably, the liquid fuel inlet pipe is a capillary tube.

[0008] Preferably, the aperture of the spray hole is smaller than the aperture of the liquid fuel inlet pipe.

[0009] Preferably, the head end of the nozzle bottom member is threadedly connected to the tail end of the nozzle body.

[0010] Preferably, an external thread is provided on the outer wall of the head end of the nozzle bottom component, and an internal thread matching the external thread is provided on the inner wall of the rear end of the nozzle body.

[0011] Preferably, a mutually matching annular step structure is provided between the head end of the nozzle bottom member and the tail end of the nozzle body, serving as a threaded connection section between them.

[0012] Preferably, a stop or an inwardly protruding annular boss for limiting the head end of the nozzle bottom component is provided on the inner wall of the end of the nozzle body.

[0013] Preferably, the distance between the outlet end of the liquid fuel inlet pipe and the inner wall of the terminal end of the nozzle bottom member is smaller than the distance between the outer wall of the liquid fuel inlet pipe and the inner wall of the nozzle bottom member. For example, the distance between the outer wall of the liquid fuel inlet pipe and the inner wall of the nozzle bottom member is not less than three times the distance between the outlet end of the liquid fuel inlet pipe and the inner wall of the terminal end of the nozzle bottom member.

[0014] Furthermore, the distance between the outlet end of the liquid fuel inlet pipe and the inner wall of the end of the nozzle bottom component is smaller than the aperture of the liquid fuel inlet pipe.

[0015] Preferably, the volume of the fuel and the auxiliary working medium is smaller than the volume of the annular cavity. For example, the volume of the annular cavity is not less than 10 times the volume of the mixing area.

[0016] The beneficial effects of the present invention are as follows: when the auxiliary working medium enters the mixing chamber / mixing zone from the annular cavity, it obtains a large amount of kinetic energy due to the sudden reduction of the flow space. The kinetic energy of the auxiliary working medium is released in the mixing chamber / mixing zone, and the liquid fuel is impacted and crushed before being ejected through the nozzle hole, so that the auxiliary working medium can well atomize the liquid fuel under very low pressure (inlet pressure). The auxiliary working medium only needs a pressure of 2-5 bar to atomize heavy oil, and the working process is stable. When the viscosity of the liquid fuel is relatively high, the axial length of the mixing chamber / the size of the mixing zone can be reduced by rotating the nozzle bottom member relative to the nozzle body, adjusting the length of the liquid fuel inlet pipe extending into the nozzle bottom member, and / or replacing the liquid fuel inlet pipe with a different inner diameter. Therefore, the auxiliary working medium can obtain greater kinetic energy when entering the mixing chamber / mixing zone, thereby crushing the liquid fuel with a higher viscosity and effectively atomizing it. The utility model has a simple structure and is easy to manufacture. It can effectively atomize liquid fuels of different viscosities, has high atomization efficiency, and has low atomization cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 A schematic axial cross-sectional view of an embodiment;

[0019] Figure 3 for Figure 2 AA cross-sectional view.

[0020] Figure numerals: 1. nozzle bottom member; 2. external thread / internal thread; 3. nozzle body; 4. auxiliary working fluid inlet; 5. ferrule joint; 6. liquid fuel inlet pipe; 7. spray hole; 8. annular cavity. DETAILED DESCRIPTION

[0021] like Figure 1-Figure 3 As shown, the embodiment of the present invention provides a flow mixing nozzle for atomizing high-viscosity fuel, comprising a nozzle bottom member 1, a nozzle body 3 and a liquid fuel inlet pipe 6. The nozzle bottom member 1 is in the shape of a blind tube with an open head end and a closed tail end (except for a spray hole 7). The nozzle body 3 is in the shape of a tube with open ends. The head end of the nozzle bottom member 1 is connected to the tail end of the nozzle body 3. A spray hole 7 is provided at the center of the tail end of the nozzle bottom member 1. The outer diameter of the liquid fuel inlet pipe 6 is smaller than the inner diameter of the nozzle bottom member 1 and the nozzle body 3. The liquid fuel inlet pipe 6 is coaxially located in the nozzle bottom member 1 and the nozzle body 3, and is usually inserted into the nozzle body 3 and the nozzle bottom member 1 from the head end of the nozzle body 3 to pass liquid into the nozzle. The liquid fuel (such as diesel) is detachably fixed and sealed to the head end of the nozzle body 3 through a ferrule joint 5, which makes it easy to replace the liquid fuel inlet pipe 6 and adjust the depth of the liquid fuel inlet pipe 6 into the nozzle bottom component 1. A gap is left between the outlet end of the liquid fuel inlet pipe 6 and the inner wall of the end of the nozzle bottom component 1 to form a mixing area to achieve mixing of two-phase flow (liquid fuel and auxiliary working fluid). An annular cavity 8 is formed between the outer wall of the liquid fuel inlet pipe 6 and the inner walls of the nozzle bottom component 1 and the nozzle body 3. An auxiliary working fluid inlet 4 connected to the annular cavity 8 is provided on the side wall of the nozzle body 3 for introducing an auxiliary working fluid (generally a combustion-supporting gas such as air or hydrogen) into the nozzle.

[0022] In one embodiment, the liquid fuel inlet pipe 6 is a capillary tube. The diameter of the liquid fuel inlet pipe 6 and the diameter of the nozzle hole 7 can be based on existing technology. Generally, the diameter of the liquid fuel inlet pipe 6 can be significantly larger than the diameter of the nozzle hole 7.

[0023] In one embodiment, specifically, the head end of the nozzle bottom member 1 is threadedly connected to the end of the nozzle body 3, so that the nozzle bottom member 1 can rotate relative to the nozzle body 3, thereby adjusting the distance between the outlet end of the liquid fuel inlet pipe 6 and the inner wall of the end of the nozzle bottom member 1, and the threaded connection part is provided with a corresponding annular step structure (see Figure 2 The threaded connection section on the outer wall of the head end of the nozzle base member 1 may be provided with an external thread 2, and the threaded connection section on the inner wall of the end end of the nozzle body 3 may be provided with an internal thread matching the external thread 2.

[0024] In one embodiment, specifically, a stop or an inwardly protruding annular boss for limiting the head end of the nozzle bottom component 1 is provided on the inner wall of the end of the nozzle body 3 .

[0025] In one embodiment, specifically, the volume of the mixing chamber (the area between the outlet end of the liquid fuel inlet pipe 6 and the inner wall of the end of the nozzle base member 1) is smaller than the volume of the annular cavity 8. Typically, the volume of the annular cavity 8 is not less than 10 times the volume of the mixing chamber.

[0026] In one embodiment, specifically, the distance between the outlet end of the liquid fuel inlet pipe 6 and the inner wall of the end of the nozzle bottom member 1 is smaller than the distance between the outer wall of the liquid fuel inlet pipe 6 and the inner wall of the nozzle bottom member 1. Typically, the distance between the outer wall of the liquid fuel inlet pipe 6 and the inner wall of the nozzle bottom member 1 is not less than three times the distance between the outlet end of the liquid fuel inlet pipe 6 and the inner wall of the end of the nozzle bottom member 1.

[0027] When the utility model is in operation, liquid fuel enters the mixing chamber of the nozzle through the liquid fuel inlet pipe 6 installed inside the nozzle, and the auxiliary working medium enters the nozzle through the auxiliary working medium inlet 4 on the nozzle body 3. The auxiliary working medium and the liquid fuel interact with each other in the mixing chamber to atomize the fuel, and then it is sprayed out from the nozzle hole 7.

[0028] In the nozzle bottom member 1, the area between the spray hole 7 and the outlet end (end) of the liquid fuel inlet pipe 6 forms a mixing area for two-phase flow mixing. Rotating the nozzle bottom member 1 relative to the nozzle body 3, adjusting the length of the liquid fuel inlet pipe 6 extending into the nozzle bottom member 1 and / or replacing the liquid fuel inlet pipe 6 with a different inner diameter can reduce the axial length of the mixing chamber / reduce the size of the mixing zone.

[0029] The liquid fuel enters the mixing chamber directly through the liquid fuel inlet pipe 6. The auxiliary working fluid enters the annular cavity 8 through the auxiliary working fluid inlet 4 before entering the mixing chamber and meeting the liquid fuel. As the auxiliary working fluid enters the mixing zone from the annular cavity between the liquid fuel inlet pipe 6 and the nozzle base member 1, it gains significant kinetic energy due to the sudden decrease in flow volume, causing it to enter the mixing chamber at a much higher speed than the liquid fuel. This kinetic energy is released in the mixing chamber, breaking up the liquid fuel before it is forced into the cylinder through the nozzle orifice 7. This allows the auxiliary working fluid to effectively atomize the liquid fuel even at very low pressure (the intake pressure entering the nozzle through the auxiliary working fluid inlet 4).

[0030] When the viscosity of the liquid fuel is relatively high, the length of the liquid fuel inlet pipe 6 extending into the nozzle bottom member 1 can be adjusted and / or the liquid fuel inlet pipe 6 with a different inner diameter can be replaced to reduce the axial length of the mixing chamber / reduce the size of the mixing zone, so that the auxiliary working fluid can obtain greater kinetic energy when entering the mixing chamber, thereby atomizing the liquid fuel with higher viscosity.

[0031] The liquid fuel enters the nozzle's mixing chamber directly through the capillary tube. Auxiliary fluid (typically a combustion-supporting gas such as air or hydrogen) enters the annular cavity outside the capillary tube through an inlet on the outside of the nozzle body and meets the liquid fuel in the mixing chamber. The auxiliary fluid enters the nozzle body at a much higher velocity than the liquid fuel. This kinetic energy is released in the mixing chamber, breaking up the liquid fuel and forcing it into the cylinder through the nozzle orifice, resulting in a well-defined atomization process.

[0032] Because the overall size of the mixing chamber formed by the capillary tip and the nozzle wall is much smaller than the annular cavity, the auxiliary working fluid gains significant kinetic energy when it reaches the mixing chamber from the annular cavity due to the sudden decrease in flow space. This allows for excellent atomization of the liquid fuel even at very low intake pressures. When the liquid fuel is more viscous, the size of the mixing chamber can be reduced by adjusting the threads, allowing the auxiliary working fluid to gain greater kinetic energy, thereby atomizing the higher-viscosity liquid fuel.

[0033] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A flow mixing nozzle for atomizing high viscosity fuel, characterized by The nozzle body is in the shape of a tube with two open ends, and the nozzle body is in the shape of a tube with two open ends. The head end of the nozzle bottom member is connected to the end of the nozzle body, and a spray hole is provided at the center of the end of the nozzle bottom member. The outer diameter of the liquid fuel inlet pipe is smaller than the inner diameter of the nozzle bottom member and the nozzle body. The liquid fuel inlet pipe extends into the nozzle bottom member and the nozzle body and is coaxially fixedly connected to the nozzle body. An annular cavity is formed between the outer wall of the liquid fuel inlet pipe and the inner wall of the nozzle bottom member and the nozzle body. An auxiliary working medium inlet connected to the annular cavity is provided on the side wall of the nozzle body. A spacing is left between the outlet end of the liquid fuel inlet pipe and the inner wall of the end of the nozzle bottom member.

2. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 1, characterized in that The liquid fuel inlet pipe is detachably fixedly connected to the head end of the nozzle body through a ferrule joint.

3. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 2, characterized in that The ferrule joint is threadedly connected to the first end of the nozzle body.

4. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 1, characterized in that The liquid fuel inlet pipe is a capillary tube.

5. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 4, characterized in that The aperture of the spray hole is smaller than the aperture of the liquid fuel inlet pipe.

6. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 1, characterized in that The head end of the nozzle bottom component is threadedly connected to the rear end of the nozzle body.

7. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 6, characterized in that A mutually matching annular step structure is provided between the head end of the nozzle bottom component and the tail end of the nozzle body, serving as a threaded connection section between them.

8. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 1, characterized in that The distance between the outlet end of the liquid fuel inlet pipe and the inner wall of the end of the nozzle bottom component is smaller than the distance between the outer wall of the liquid fuel inlet pipe and the inner wall of the nozzle bottom component.

9. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 8, characterized in that The distance between the outlet end of the liquid fuel inlet pipe and the inner wall of the end of the nozzle bottom component is smaller than the aperture of the liquid fuel inlet pipe.

10. The flow mixing nozzle for atomizing high-viscosity fuel according to claim 1, characterized in that The volume of the mixing area of the fuel and the auxiliary working medium is smaller than the volume of the annular cavity.

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