Conical angle adjustable pneumatic coupling nozzle

Abstract

The application discloses a conical angle adjustable pneumatic coupling nozzle, comprising a nozzle pipe, an oil pipe, an air pipe, an oil injection core and a lifting control module; the nozzle pipe comprises a pipe body and a base; the oil injection core comprises a conical cap, a nozzle head, a connecting rod and an oil injection base connected in sequence; and the lifting control module comprises a connecting seat, a servo motor, a pin bolt and a rotating bushing. The servo motor is used for controlling the telescopic oil injection core, changing the throat shape of the fuel injection port, and adjusting the conical angle of the nozzle oil supply in real time. In addition, the oil mist conical angle control under a wide range of fuel flow can be realized through the array air holes, and the self-adaptive capacity of the oil and gas efficient mixing under multiple working conditions of the engine can be improved.

Description

Technical Field

[0001] This invention relates to the field of novel concept intelligent nozzle technology for aero-engines, and in particular to a cone-angle adjustable aerodynamic coupling nozzle, which is mainly used as an aerodynamic coupling fuel injection nozzle in the combustion chamber of an aero-engine. Background Technology

[0002] With the development of the aviation industry, the performance requirements of aircraft are gradually increasing, and aero engines need to further improve thrust-to-weight ratio, reduce emissions and fuel consumption, and broaden the stable operating boundary. Currently, the development of aero engines in my country is constrained by many problems: high-altitude re-ignition issues, difficulties and low efficiency in high-altitude starts, and high-temperature engine emissions. For next-generation afterburners, the widening and extreme nature of incoming flow conditions is a particularly prominent issue. To meet the development goals of stable combustion boundaries and high combustion efficiency in advanced combustors, improving the flow field and oil mist field is one of the key research directions. As the thrust-to-weight ratio of advanced engines increases, the fuel-air ratio, temperature rise, and nozzle flow distribution in the main combustor will all increase to varying degrees. Afterburners face a wider range of extreme incoming flow conditions, and the nozzle will undertake an increasingly important task of fuel-air mixing.

[0003] With the successive generations of aero engines, fuel nozzles have undergone three stages of change: from simple and diverse basic atomizing nozzles to combined atomizing nozzles, and then to complex partitioned and graded combined atomizing nozzles. The replacement of nozzles has always pursued the goal of increasing combustion chamber temperature and reducing emissions. Conventional nozzles include centrifugal nozzles, direct-injection nozzles, and air-atomizing nozzles. Direct-injection nozzles offer good fuel penetration and a wide flow adjustment range, but the fuel mist distribution is uneven. Centrifugal nozzles and air-atomizing nozzles provide good atomization, but their fuel adjustment range is limited. Elementary nozzles have been extensively researched and are widely used. Combined fuel injection systems typically employ centrifugal injection combined with a first-stage swirl for pre-combustion atomization. They often use rich-fuel diffusion combustion to improve ignition and shutdown performance. The main combustion stage relies on direct injection with a venturi tube and second / multi-stage swirl for pre-film atomization. Pre-film air atomization offers good low-pressure atomization, flame stabilization, and significant potential for low smoke and emissions, but it requires high-quality air intake at the head. Partitioned and graded combined atomizing nozzles are complex overall, with highly coupled components and complex flow and spray field organization. They possess good atomization and combustion performance, but as engine thrust demands increase, fuel adjustment range expands, and head air intake increases, their strong coupling effect makes combustion chamber design and performance optimization difficult. Their mechanism requires further systematic research. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the deficiencies mentioned in the background art by providing a pneumatically coupled nozzle with adjustable cone angle. It uses a servo motor to control the extension and retraction of the fuel injector core, changes the shape of the fuel injector throat, and adjusts the common cone angle of the nozzle in real time. It can also achieve fuel mist cone angle control under a wide range of fuel flow through arrayed air holes, thereby improving the adaptive capability of efficient fuel-air mixing under multiple engine operating conditions.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An adjustable cone angle pneumatic coupling nozzle includes a nozzle pipe, an oil pipe, an air pipe, an injection core, and a lifting control module.

[0007] The nozzle includes a tube body and a base;

[0008] The tube body is cylindrical and has an injection through-hole along its axis. The injection through-hole sequentially includes a mixing section, a fuel section, an operating section, and a fixing section from the end of the tube body to the tail. The mixing section is frustum-shaped, while the fuel section, operating section, and fixing section are all cylindrical. The end of the mixing section with the smaller end face has the same shape as the end of the fuel section and is coaxially connected. The cross-sectional areas of the fuel section, operating section, and fixing section increase sequentially and are coaxially connected sequentially. The tube body has an internal thread on the inner wall of the fixing section of the injection through-hole, which is away from the operating section.

[0009] The base is a cylinder, one end of which is provided with an external thread that mates with the internal thread on the tube body, and the base and the tube body are threadedly connected.

[0010] The tube body is provided with an air ring cavity, which is an annular cavity that is sleeved outside the fuel section of the injection through hole;

[0011] One end of the trachea is connected to an external air source, and the other end is fixedly connected to the tube body and communicates with the air ring cavity of the tube body.

[0012] The pipe body has at least two rings of cross-arrayed air holes evenly arranged on the conical surface of the jet through-hole mixing section. All air holes are connected to the annular cavity and the connecting pipes built into the pipe body are parallel to the pipe body axis.

[0013] One end of the oil pipe is connected to an external oil source, and the other end is fixedly connected to the pipe body and connected to the fuel section of the injection through hole of the pipe body.

[0014] The fuel injection core includes a cone cap, a nozzle head, a connecting rod, and a fuel injection seat connected in sequence;

[0015] The cone cap is conical, and the fuel injection seat is cylindrical. The diameter of the bottom surface of the cone cap is smaller than the diameter of the cross-section of the fuel injection through-hole in the pipe body.

[0016] The nozzle head includes a first mating part and a second mating part; the cross-section of either the first mating part or the second mating part is circular, and the radius of the cross-section gradually decreases along the direction from the cone cap to the fuel injector seat; the opening of the sidewall profile of the first mating part faces inward, and the opening of the sidewall profile of the second mating part faces outward; the end of the first mating part near the cone cap has the same shape as the bottom surface of the cone cap and is coaxially fixed, and the end away from the cone cap of the second mating part has the same shape as the end near the cone cap and is coaxially fixed; the end of the second mating part away from the cone cap has the same shape as the end of the connecting rod and is coaxially fixed.

[0017] The other end of the connecting rod and one end of the fuel injector are coaxially fixed together.

[0018] The side wall of the fuel injector is provided with a pin through hole that passes through and is perpendicular to its axis.

[0019] The base has a mounting hole at the center of the end face of the end with external threads;

[0020] The lifting control module includes a connecting base, a servo motor, a pin, and a rotating bushing;

[0021] The connecting seat is a cylinder disposed inside the injection through hole fixing part;

[0022] The servo motor is fixed in the mounting hole of the base, and its output shaft extends out of the mounting hole of the base and is coaxially fixed to one end of the connecting seat.

[0023] The rotating bushing is a hollow cylinder with openings at both ends, coaxially disposed within the injection through-hole operating part, with one end coaxially fixed to the end of the connecting seat away from the servo motor; the side wall of the rotating bushing is provided with a first through groove and a second through groove that cooperate with the pin; the first through groove and the second through groove have the same structure and are axially symmetrical about the axis of the rotating bushing, each including a first mounting part, an adjusting part and a second mounting part, wherein the adjusting part is a straight through groove parallel to the axis of the rotating bushing, and the first mounting part and the second mounting part are both arc-shaped through grooves perpendicular to the axis of the rotating bushing, with both ends of the adjusting part connected to one end of the first mounting part and the second mounting part respectively, and the second mounting part located between the first mounting part and the connecting seat;

[0024] The pipe body has a spiral groove on the inner wall at the injection through-hole operating part for cooperating with the pin;

[0025] The fuel injector is disposed in the rotating bushing;

[0026] Both ends of the pin are set as ball heads. One ball head passes through the first through groove and engages with the spiral groove on the inner wall of the nozzle. The other ball head passes through the pin hole of the fuel injector seat and the second through groove in sequence and engages with the spiral groove on the inner wall of the nozzle.

[0027] When the pin is located at the second mounting part of the first through groove, the bottom surface of the cone cap of the fuel injector core and the end face of the smaller mixing part of the nozzle are coplanar;

[0028] The servo motor is used to drive the rotating bushing to rotate, and the oil injection core is controlled to rise or fall by cooperating with the pin, the adjustment part of the first through groove, the adjustment part of the second through groove, and the spiral slide groove on the inner wall of the nozzle.

[0029] As a further optimization of the cone-angle adjustable pneumatic coupling nozzle of the present invention, a transmission block is also provided for easy assembly. The transmission block is a regular prism.

[0030] The center of the end face of the connecting seat away from the rotating bushing is provided with a mating blind hole for cooperating with the transmission block; the transmission block is disposed in the mating blind hole of the connecting seat, and the output shaft of the servo motor and the transmission block are coaxially fixedly connected.

[0031] The upper end of the connecting seat abuts against the end of the operating part of the nozzle injection through-hole near the fuel section.

[0032] As a further optimization of the adjustable cone angle pneumatic coupling nozzle of the present invention, the angle between the generatrix of the cone surface of the tube body at the mixing part of the injection through hole and its axis does not exceed 45°.

[0033] As a further optimization of the cone-angle adjustable pneumatic coupling nozzle of the present invention, the diameter of the air hole on the cone surface of the injection through-hole mixing section of the tube body does not exceed 0.5 mm, and the diameter of the fuel section of the injection through-hole is 3 mm.

[0034] As a further optimization of the cone-angle adjustable pneumatic coupling nozzle of the present invention, the contours of the sidewalls of the first mating part and the second mating part are both quarter-ellipse lines formed by dividing the ellipse by its major and minor radii, and the major axis of the ellipse is collinear with the axis of the nozzle.

[0035] As a further optimization of the cone-angle adjustable pneumatic coupling nozzle of the present invention, the major and minor radii of the ellipse are 1mm and 0.45mm, respectively.

[0036] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0037] 1. Aerodynamically assisted fuel atomization, with the fuel mist cone angle adjustable in real time within a wide flow range, ranging from 0° to 90°;

[0038] 2. Wide flow margin fuel supply reduces the pressure difference of fuel supplied at high flow rates, ensuring fuel quality;

[0039] 3. Optimize fuel mist distribution morphology in multiple scenarios. Increasing the fuel mist cone angle accelerates fuel film breakup and improves mixing ability. When applied to the main combustion chamber, this can improve ignition performance, flame stability, and combustion efficiency. Decreasing the fuel mist cone angle can increase fuel penetration depth and expand the fuel mist distribution range. When applied to the afterburner, this can also improve ignition performance, flame stability, and combustion efficiency.

[0040] 4. The present invention has a simple structure. By substituting the equation relating the oil mist cone angle to the extension and retraction length of the fuel injection core and the fuel flow rate into the servo motor, precise control of the oil mist cone angle can be achieved under a wide range of fuel supply flow rates. It is intelligent and easy to operate.

[0041] 5. To meet the requirements of high-temperature combustion chamber, changing the fuel-air supply ratio effectively alters the fuel mist particle size, reducing the generation of NOx and soot;

[0042] 6. Assisted air can increase fuel temperature and enhance atomization. It can also reduce the thermal interference of the flame on the nozzle by purging the air film holes on the nozzle end face and convective heat transfer through the air wall in the air ring cavity, thereby reducing the risk of fuel coking and clogging.

[0043] 7. The flow channel structure is simple, making it convenient for nozzle maintenance and coking removal. Attached Figure Description

[0044] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0045] Figure 2 This is a three-dimensional structural schematic diagram showing a partial cross-section of the present invention;

[0046] Figure 3 This is a three-dimensional structural schematic diagram of the portion of the nozzle, air pipe, and oil pipe that are connected in this invention.

[0047] Figure 4 This is a schematic diagram of the fuel injector core in this invention;

[0048] Figure 5 This is a cross-sectional schematic diagram of the present invention;

[0049] Figure 6 This is a schematic diagram of the structure in which the rotating bushing and the connecting seat cooperate in this invention;

[0050] Figure 7 This is a schematic diagram of the ball head pin structure in this invention;

[0051] Figure 8 This is a schematic diagram of the structure of the nozzle base, servo motor, and transmission block in this invention.

[0052] In the diagram, 1-nozzle body, 2-nozzle base, 3-oil pipe, 4-air pipe, 5-fuel injector core, 6-lowering control module, 7-mixing part of injection orifice, 8-fuel part of injection orifice, 9-operating part of injection orifice, 10-fixing part of injection orifice, 11-air ring cavity, 12-cone cap, 13-nozzle head, 14-connecting rod, 15-fuel injector seat, 16-pin through hole, 17-array air holes, 18-connection point between oil pipe and nozzle body, 19-connecting seat, 20-rotating bushing, 21-servo motor, 22-transmission block. Detailed Implementation

[0053] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0054] This invention can be implemented in many different forms and should not be considered limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully express the scope of the invention to those skilled in the art. In the drawings, components are enlarged for clarity.

[0055] It should be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are merely used to distinguish elements, components, and / or parts from one another. Therefore, the first element, component, and / or part discussed below may be a second element, component, or part without departing from the teachings of this invention.

[0056] To better meet the multi-objective and high-performance requirements of aero engines, and to improve the fuel supply and atomization performance under high operating conditions (high temperature and high pressure) and extreme conditions, such as... Figure 1 , Figure 2 As shown, this invention proposes a cone-angle adjustable pneumatic coupling nozzle, comprising a nozzle pipe, an oil pipe, an air pipe, an injection core, and a lifting control module:

[0057] The nozzle includes a tube body and a base;

[0058] like Figure 3 As shown, the tube body is cylindrical and has an injection through-hole along its axis. The injection through-hole sequentially includes a mixing section, a fuel section, an operating section, and a fixing section from the end of the tube body to the tail. The mixing section is frustum-shaped, while the fuel section, operating section, and fixing section are all cylindrical. The end of the mixing section with the smaller end face has the same shape as the end of the fuel section and is coaxially connected. The cross-sectional areas of the fuel section, operating section, and fixing section increase sequentially and are coaxially connected sequentially. The tube body has an internal thread on the inner wall of the fixing section of the injection through-hole, which is away from the operating section.

[0059] The base is a cylinder, one end of which is provided with an external thread that mates with the internal thread on the tube body, and the base and the tube body are threadedly connected.

[0060] The tube body is provided with an air ring cavity, which is an annular cavity that is sleeved outside the fuel section of the injection through hole;

[0061] One end of the trachea is connected to an external air source, and the other end is fixedly connected to the tube body and communicates with the air ring cavity of the tube body.

[0062] The pipe body has at least two rings of cross-arrayed air holes evenly arranged on the conical surface of the jet through-hole mixing section. All air holes are connected to the annular cavity and the connecting pipes built into the pipe body are parallel to the pipe body axis.

[0063] One end of the oil pipe is connected to an external oil source, and the other end is fixedly connected to the pipe body and connected to the fuel section of the injection through hole of the pipe body.

[0064] like Figure 4 As shown, the fuel injection core includes a cone cap, a nozzle head, a connecting rod, and a fuel injection seat connected in sequence;

[0065] The cone cap is conical, and the fuel injection seat is cylindrical. The diameter of the bottom surface of the cone cap is smaller than the diameter of the cross-section of the fuel injection through-hole in the pipe body.

[0066] The nozzle head includes a first mating part and a second mating part; the cross-section of either the first or second mating part is circular, and the radius of the cross-section gradually decreases along the direction from the cone cap to the fuel injector seat; the opening of the sidewall profile of the first mating part faces inward, and the opening of the sidewall profile of the second mating part faces outward, as shown below. Figure 5 As shown; the end of the first mating part near the cone cap has the same shape as the bottom surface of the cone cap and is coaxially fixed; the end away from the cone cap and the end of the second mating part near the cone cap have the same shape as the second mating part and are coaxially fixed; the end of the second mating part away from the cone cap has the same shape as the end of the connecting rod and is coaxially fixed.

[0067] The other end of the connecting rod and one end of the fuel injector are coaxially fixed together.

[0068] The side wall of the fuel injector is provided with a pin through hole that passes through and is perpendicular to its axis.

[0069] The base has a mounting hole at the center of the end face of the end with external threads;

[0070] The lifting control module includes a connecting base, a servo motor, a pin, and a rotating bushing;

[0071] The connecting seat is a cylinder disposed inside the injection through hole fixing part;

[0072] The servo motor is fixed in the mounting hole of the base, and its output shaft extends out of the mounting hole of the base and is coaxially fixed to one end of the connecting seat.

[0073] like Figure 6 As shown, the rotating bushing is a hollow cylinder with openings at both ends, coaxially disposed within the injection through-hole operating part, with one end coaxially fixed to the end of the connecting seat away from the servo motor; the side wall of the rotating bushing is provided with a first through groove and a second through groove that cooperate with the pin; the first through groove and the second through groove have the same structure and are axially symmetrical about the axis of the rotating bushing, each including a first mounting part, an adjusting part and a second mounting part, wherein the adjusting part is a straight through groove parallel to the axis of the rotating bushing, and the first mounting part and the second mounting part are both arc-shaped through grooves perpendicular to the axis of the rotating bushing, with both ends of the adjusting part connected to one end of the first mounting part and the second mounting part respectively, and the second mounting part located between the first mounting part and the connecting seat;

[0074] The pipe body has a spiral groove on the inner wall at the injection through-hole operating part for cooperating with the pin;

[0075] The fuel injector is disposed in the rotating bushing;

[0076] like Figure 7 As shown, both ends of the pin are ball-headed. One ball-headed end passes through the first through groove and engages with the spiral groove on the inner wall of the nozzle. The other ball-headed end passes through the pin hole of the fuel injector seat and the second through groove in sequence, and then engages with the spiral groove on the inner wall of the nozzle. Figure 5 As shown;

[0077] When the pin is located at the second mounting part of the first through groove, the bottom surface of the cone cap of the fuel injector core and the end face of the smaller mixing part of the nozzle are coplanar;

[0078] The servo motor is used to drive the rotating bushing to rotate, and the oil injection core is controlled to rise or fall by cooperating with the pin, the adjustment part of the first through groove, the adjustment part of the second through groove, and the spiral slide groove on the inner wall of the nozzle.

[0079] like Figure 8 As shown, for ease of assembly, the present invention further includes a transmission block, which is a regular prism;

[0080] The center of the end face of the connecting seat away from the rotating bushing is provided with a mating blind hole for cooperating with the transmission block; the transmission block is disposed in the mating blind hole of the connecting seat, and the output shaft of the servo motor and the transmission block are coaxially fixedly connected.

[0081] The upper end of the connecting seat abuts against the end of the operating part of the nozzle injection through-hole near the fuel section.

[0082] The angle between the generatrix of the conical surface of the pipe body at the mixing section of the injection through-hole and its axis does not exceed 45°, the diameter of the air hole on the conical surface of the pipe body at the mixing section of the injection through-hole does not exceed 0.5 mm, and the diameter of the fuel section of the injection through-hole is 3 mm.

[0083] The contours of the sidewalls of the first and second mating parts preferably adopt quarter-ellipse lines formed by dividing an ellipse by its major and minor radii, and the major axis of the ellipse is collinear with the axis of the nozzle. The major and minor radii of the ellipse are preferably 1 mm and 0.45 mm, respectively.

[0084] This invention adjusts the fuel supply pressure differential and regulates the fuel mist cone shape and distribution through the extension and retraction of the fuel injector core and the coordinated control of the air supply. The nozzle head and nozzle pipe form an annular throat through which fuel is injected under pressure. Coupled with the auxiliary airflow in the mixing section of the injection orifice, the fuel mist distribution pattern is controlled. The nozzle head and nozzle pipe can be combined to form fuel outlets of different shapes, thereby changing the ratio of fuel injection tangential and axial momentum and obtaining different initial fuel mist cone angles. The cone cap prevents fuel backflow; the cross-array of air holes arranged on the cone surface of the nozzle body at the mixing section of the injection orifice is used to uniformly distribute the outlet airflow velocity, improving the circumferential uniformity of the fuel mist cone. The air film formed by the air exiting the air holes provides thermal protection and prevents coking and clogging of the nozzle.

[0085] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0086] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A conical angle adjustable aerodynamic coupling nozzle, characterized by, Includes nozzle, fuel line, air line, fuel injector, and lifting control module: The nozzle includes a tube body and a base; The tube body is cylindrical and has an injection through-hole along its axis. The injection through-hole sequentially includes a mixing section, a fuel section, an operating section, and a fixing section from the end of the tube body to the tail. The mixing section is frustum-shaped, while the fuel section, operating section, and fixing section are all cylindrical. The end of the mixing section with the smaller end face has the same shape as the end of the fuel section and is coaxially connected. The cross-sectional areas of the fuel section, operating section, and fixing section increase sequentially and are coaxially connected sequentially. The tube body has an internal thread on the inner wall of the fixing section of the injection through-hole, which is away from the operating section. The base is a cylinder, one end of which is provided with an external thread that mates with the internal thread on the tube body, and the base and the tube body are threadedly connected. The tube body is provided with an air ring cavity, which is an annular cavity that is sleeved outside the fuel section of the injection through hole; One end of the trachea is connected to an external air source, and the other end is fixedly connected to the tube body and communicates with the air ring cavity of the tube body. The pipe body has at least two rings of cross-arrayed air holes evenly arranged on the conical surface of the jet through-hole mixing section. The air holes are all connected to the annular cavity through connecting pipes, and the connecting pipes built into the pipe body are all parallel to the pipe body axis. One end of the oil pipe is connected to an external oil source, and the other end is fixedly connected to the pipe body and connected to the fuel section of the injection through hole of the pipe body. The fuel injection core includes a cone cap, a nozzle head, a connecting rod, and a fuel injection seat connected in sequence; The cone cap is conical, and the fuel injection seat is cylindrical. The diameter of the bottom surface of the cone cap is smaller than the diameter of the cross-section of the fuel injection through-hole in the pipe body. The nozzle head includes a first mating part and a second mating part; the cross-section of either the first mating part or the second mating part is circular, and the radius of the cross-section gradually decreases along the direction from the cone cap to the fuel injector seat; the opening of the sidewall profile of the first mating part faces inward, and the opening of the sidewall profile of the second mating part faces outward; the end of the first mating part near the cone cap has the same shape as the bottom surface of the cone cap and is coaxially fixed, and the end away from the cone cap of the second mating part has the same shape as the end near the cone cap and is coaxially fixed; the end of the second mating part away from the cone cap has the same shape as the end of the connecting rod and is coaxially fixed. The other end of the connecting rod and one end of the fuel injector are coaxially fixed together. The side wall of the fuel injector is provided with a pin through hole that passes through and is perpendicular to its axis. The base has a mounting hole at the center of the end face of the end with external threads; The lifting control module includes a connecting base, a servo motor, a pin, and a rotating bushing; The connecting seat is a cylinder disposed inside the injection through hole fixing part; The servo motor is fixed in the mounting hole of the base, and its output shaft extends out of the mounting hole of the base and is coaxially fixed to one end of the connecting seat. The rotating bushing is a hollow cylinder with openings at both ends, coaxially disposed within the injection through-hole operating section, with one end coaxially fixed to the end of the connecting seat away from the servo motor; the side wall of the rotating bushing is provided with a first through groove and a second through groove that mate with the pin; the first through groove and the second through groove have the same structure and are axially symmetrical about the axis of the rotating bushing, each including a first mounting part, an adjusting part, and a second mounting part, wherein the adjusting part is a straight through groove parallel to the axis of the rotating bushing, and the first mounting part and the second mounting part are both arc-shaped through grooves perpendicular to the axis of the rotating bushing, with both ends of the adjusting part connected to one end of the first mounting part and the second mounting part respectively, and the second mounting part located between the first mounting part and the connecting seat; The pipe body has a spiral groove on the inner wall at the injection through-hole operating part for cooperating with the pin; The fuel injector is disposed in the rotating bushing; Both ends of the pin are set as ball heads. One ball head passes through the first through groove and engages with the spiral groove on the inner wall of the nozzle. The other ball head passes through the pin hole of the fuel injector seat and the second through groove in sequence and engages with the spiral groove on the inner wall of the nozzle. When the pin is located at the second mounting part of the first through groove, the bottom surface of the cone cap of the fuel injector core and the end face with a smaller area of ​​the mixing part of the injection through hole are coplanar; The servo motor is used to drive the rotating bushing to rotate, and the oil injection core is controlled to rise or fall by cooperating with the pin, the adjustment part of the first through groove, the adjustment part of the second through groove, and the spiral slide groove on the inner wall of the nozzle.

2. The adjustable-cone-angle pneumatic coupling nozzle of claim 1, wherein, For ease of assembly, a transmission block is also provided, which is a regular prism; The center of the end face of the connecting seat away from the rotating bushing is provided with a mating blind hole for cooperating with the transmission block; the transmission block is disposed in the mating blind hole of the connecting seat, and the output shaft of the servo motor and the transmission block are coaxially fixedly connected. The upper end of the connecting seat abuts against the end of the operating part of the nozzle injection through-hole near the fuel section.

3. The adjustable-cone-angle pneumatic coupling nozzle of claim 1, wherein, The angle between the generatrix of the conical surface of the tube body at the mixing section of the injection through-hole and its axis does not exceed 45°.

4. The adjustable-cone-angle pneumatic coupling nozzle of claim 1, wherein, The diameter of the air hole on the conical surface of the injection through-hole mixing section of the tube body does not exceed 0.5 mm, and the diameter of the fuel injection through-hole section is 3 mm.

5. The adjustable-cone-angle pneumatic coupling nozzle of claim 1, wherein, The contours of the sidewalls of the first mating part and the second mating part are both quarter-ellipse lines formed by dividing the ellipse by its major and minor radii, and the major axis of the ellipse is collinear with the axis of the nozzle.

6. The adjustable-cone pneumatic coupling nozzle of claim 5, wherein, The major and minor radii of the ellipse are 1 mm and 0.45 mm, respectively.

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