A mist nozzle combining pulse excitation and bubble atomization

Abstract

The application provides a kind of atomizing nozzle of pulse excitation and bubble atomization combination, belongs to gas-liquid two-phase flow atomization technical field, the atomizing nozzle of pulse excitation and bubble atomization combination includes cavity, the rear inner wall of cavity is equipped with first circular slot, first circular slot is connected with air inlet pipe, the front end of cavity is equipped with nozzle, the rear inner wall of nozzle is equipped with nozzle convergent section, and nozzle convergent section is communicated with the cavity of cavity, the circumferential surface of cavity is equipped with second circular slot, and second circular slot is communicated with the cavity of cavity, and second circular slot is fixedly connected with pulse liquid inlet, and the lower end of pulse liquid inlet is connected with hose;The device ingeniously combines the characteristics of pulse atomization and bubble atomization technology, realizes the self-controllable of atomization effect, the bubble particle size is smaller and more uniform, the average particle size of atomized droplet is smaller and the mixing effect with the surrounding environment is better, and good working performance can be realized under non-standard working condition.

Description

Technical Field

[0001] This invention belongs to the field of gas-liquid two-phase flow atomization technology, specifically relating to an atomizing nozzle that combines pulse excitation and bubble atomization. Background Technology

[0002] Atomizing nozzles are devices that can turn large clumps of liquid into a spray or rapidly disperse them into small droplets in space. They are widely used in various industrial technologies such as internal combustion engines, gas turbines, rocket engines, agriculture, spraying, and food processing. The principle of atomizing nozzles is to utilize the high relative velocity between the liquid and the surrounding environment to promote liquid dispersion. Based on the presence or absence of gas within the nozzle, nozzle types can be categorized into pressure-type atomizing nozzles and air-assisted atomizing nozzles. Pressure-type atomizing nozzles include direct injection, pressure swirl atomizing nozzles, and recirculation nozzles, but these nozzles require high injection pressure, resulting in poor atomization at low flow rates (i.e., small pressure differentials). Air-assisted atomizing nozzles mainly include pneumatic atomizing nozzles and bubble atomizing nozzles. Pneumatic atomizing nozzles enhance atomization by leveraging the shearing action between gas and liquid momentum, but this method requires a large amount of gas. Bubble atomizing nozzles generate bubbles in the liquid with a small amount of gas, forming a bubble-like two-phase flow. After being ejected from the nozzle, the bubbles rapidly expand and break up, quickly breaking the lumpy liquid into droplets, accelerating the atomization process and significantly improving the atomization effect. Besides these two common types of atomizing nozzles, active control methods can also improve atomization, such as pulse atomizing nozzles. These nozzles apply pulse excitation to the jet, giving it a specific frequency, thereby achieving controllable atomization and enhanced atomization effect.

[0003] Existing bubble atomizing nozzles have drawbacks such as uneven bubble generation leading to unstable working conditions, and poor atomization effect due to excessively large bubbles under suboptimal working conditions. Summary of the Invention

[0004] The purpose of this invention is to provide an atomizing nozzle that combines pulse excitation and bubble atomization, aiming to solve the problems of unstable working state caused by uneven bubble number in the prior art and poor atomization effect caused by excessively large bubbles under non-optimal working conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A pulse-excitation and bubble atomization combined atomizing nozzle includes a cavity. A first circular groove is formed on the rear inner wall of the cavity, and an air inlet pipe is connected to the first circular groove. A nozzle is formed at the front end of the cavity. A nozzle converging section is formed on the rear inner wall of the nozzle and communicates with the cavity. A second circular groove is formed on the circumferential surface of the cavity and communicates with the cavity. A pulse liquid inlet is fixedly connected to the second circular groove. A flexible tube is connected to the lower end of the pulse liquid inlet. A liquid pressure regulating mechanism is provided on the lower side of the flexible tube, and the liquid pressure regulating mechanism is connected to the flexible tube to inject a pulse jet into the flexible tube.

[0007] In a preferred embodiment of the present invention, the liquid pressure regulating mechanism includes an atmospheric pressure inlet, a motor, a fixed cavity, a rotor, a second connecting hole, two first connecting holes, two first flow holes, and four second flow holes. The fixed cavity is connected to the lower end of the hose, and the rotor is rotatably connected to the inner circumferential wall of the fixed cavity. The two first connecting holes and the two first flow holes are respectively opened on the upper and lower inner walls of the fixed cavity. The second connecting holes are opened at the middle of the upper end of the rotor, and the second connecting holes are respectively matched with the two first connecting holes. The four second flow holes are all opened at the upper end of the rotor, and the four second flow holes are evenly distributed. The motor is located on the lower side of the fixed cavity, and the output shaft of the motor is fixedly connected to the inner circumferential wall of the second connecting hole. The hose and the atmospheric pressure inlet are respectively connected to the two first flow holes.

[0008] As a preferred embodiment of the present invention, the rear part of the circumferential surface of the air intake pipe is provided with an external thread, the inner wall of the circumferential surface of the first circular groove is provided with an internal thread, and the internal thread matches the external thread, and the air intake pipe is threadedly connected to the first circular groove.

[0009] In a preferred embodiment of the present invention, the upper end of the hose is fixedly connected to the lower end of the pulse inlet via a quick-connect fitting, the lower end of the hose is fixedly connected to the first flow hole located on the upper side via a quick-connect fitting, and the upper end of the atmospheric pressure inlet is fixedly connected to the first flow hole located on the lower side via a quick-connect fitting.

[0010] As a preferred embodiment of the present invention, mechanical seal bearings are fixedly connected to the inner circumferential walls of the two first connecting holes, and the output shaft of the motor is fixedly connected to the inner circumferential walls of the two mechanical seal bearings.

[0011] As a preferred embodiment of the present invention, the front end of the air intake pipe is sealed, and a plurality of evenly distributed small holes are formed on the circumferential surface of the air intake pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. In this solution, the use of pulse-excited jetting can overcome the shortcomings of the traditional bubble atomization method, which is characterized by uneven bubble number and unstable working state. The pulse excitation method is used to actively control the gas volume and bubble distribution, so that the bubbles are evenly distributed in the liquid, the jet breaks up more completely after being ejected from the nozzle, the atomization process is shorter, and the working performance is more stable.

[0014] 2. In this solution, the pulse excitation method overcomes the shortcomings of traditional bubble atomization, which suffers from poor atomization effect due to excessively large bubbles under non-optimal conditions. The pulse jet effectively breaks up large bubbles, achieving good atomization effect even under non-optimal conditions.

[0015] 3. In this solution, the combination of pulse atomization and bubble atomization allows for autonomous control of the jet frequency, resulting in controllable atomization effects, effectively suppressing combustion oscillations, and achieving more complete and stable combustion. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a first partial cross-sectional view of the cavity in this invention;

[0019] Figure 3 This is a second partial cross-sectional view of the cavity in this invention;

[0020] Figure 4 This is a partial perspective view of the motor in this invention;

[0021] Figure 5 This is a partial exploded view of the fixed cavity in this invention.

[0022] In the diagram: 1. Air inlet pipe; 2. Cavity; 3. Pulse liquid inlet; 4. Small hole; 5. Nozzle converging section; 6. Nozzle; 7. Hose; 8. Atmospheric pressure liquid inlet; 9. Motor; 10. Fixed cavity; 11. Rotor; 12. Mechanical seal bearing; 13. First connecting hole; 14. First flow hole; 15. Second flow hole; 16. Second connecting hole. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1

[0025] Please see Figure 1-5 The present invention provides the following technical solutions:

[0026] A pulse excitation and bubble atomization combined atomizing nozzle includes a cavity 2. A first circular groove is formed on the rear inner wall of the cavity 2, and an air inlet pipe 1 is connected to the first circular groove. A nozzle 6 is formed at the front end of the cavity 2. A nozzle constriction section 5 is formed on the rear inner wall of the nozzle 6 and is connected to the cavity of the cavity 2. A second circular groove is formed on the circumferential surface of the cavity 2 and is connected to the cavity of the cavity 2. A pulse liquid inlet 3 is fixedly connected to the second circular groove. A hose 7 is connected to the lower end of the pulse liquid inlet 3. A liquid pressure regulating mechanism is provided on the lower side of the hose 7. The liquid pressure regulating mechanism is connected to the hose 7 to realize the injection of pulse jet into the hose 7.

[0027] In a specific embodiment of the present invention, the air inlet pipe 1, the cavity 2, the pulse inlet port 3, the small hole 4, the nozzle constriction section 5, and the nozzle 6 together constitute an air atomizing nozzle. The inner diameter of the air inlet pipe 1 is 4 mm. One end of the air inlet pipe 1 extends out of the cavity 2 and contacts the outside air, while the other end of the air inlet pipe 1 penetrates 20 mm into the cavity of the cavity 2. A large number of small air bubbles can be injected into the cavity 2 through the air inlet pipe 1. The diameter of the cavity 2 is 10 mm, and the axial distance is 80 mm. The constriction angle of the nozzle constriction section 5 is 100°. The diameter of the nozzle 6 is 0.4 mm, and the length-to-diameter ratio is 20. The inner diameter of the pulse inlet port 3 is 4 mm. mm, the pulse inlet 3 is connected to the hose 7, the hose 7 has an orifice diameter of 6mm, the pulse jet can be injected into the hose 7 through the liquid pressure regulation mechanism, after the pulse jet is ejected from the pulse inlet 3, it will interact with the bubble-like two-phase flow in the cavity 2, thereby breaking up the large bubbles and distributing them evenly. When the fluid passes through the nozzle 6, it will be accelerated by compression, and then smaller and more uniform droplets will be ejected from the nozzle 6. Preferably, the cavity 2, the motor 9 and the fixed cavity 10 are fixed on a heavy platform, which can play a role in fixing and supporting it, and at the same time can reduce the vibration generated during the operation of the device.

[0028] Please refer to the details. Figure 1 and Figure 5The liquid pressure regulating mechanism includes an atmospheric pressure inlet 8, a motor 9, a fixed cavity 10, a rotor 11, a second connecting hole 16, two first connecting holes 13, two first flow holes 14, and four second flow holes 15. The fixed cavity 10 is connected to the lower end of the hose 7. The rotor 11 is rotatably connected to the inner circumference of the fixed cavity 10. The two first connecting holes 13 and the two first flow holes 14 are respectively opened on the upper and lower inner walls of the fixed cavity 10. The second connecting hole 16 is opened in the middle of the upper end of the rotor 11, and the second connecting hole 16 is matched with the two first connecting holes 13. The four second flow holes 15 are all opened at the upper end of the rotor 11, and the four second flow holes 15 are evenly distributed. The motor 9 is located on the lower side of the fixed cavity 10. The output shaft of the motor 9 is fixedly connected to the inner circumference of the second connecting hole 16. The hose 7 and the atmospheric pressure inlet 8 are respectively connected to the two first flow holes 14.

[0029] In this embodiment: the motor 9 can be selected according to different models as needed, for example, model Y630-10 / 1180. The motor 9 is electrically connected to an external power source. The second connecting hole 16 and the two first connecting holes 13 have the same diameter and are located at the center of the fixed cavity 10 and the rotor 11, respectively. Two first flow holes 14 with a diameter of 6 mm are respectively opened on the upper and lower inner walls of the fixed cavity 10 at a distance of 30 mm from the center. Four second flow holes 15 with a diameter of 16 mm are evenly distributed at a distance of 30 mm from the center of the rotor 11. High-pressure liquid enters the fixed cavity 10 through the atmospheric pressure inlet 8. As the motor 9 drives the rotor 11 to rotate continuously, the first flow holes 14 and the four second flow holes 15 alternate, causing the flow area to change periodically, thereby obtaining a pulse jet. Preferably, the jet frequency can be adjusted by adjusting the power of the motor 9. The generated pulse jet is transported to the bubble atomizing nozzle through the hose 7. For those skilled in the art, the above-mentioned motor 9 is prior art and will not be described in detail.

[0030] Please refer to the details. Figure 2 The intake pipe 1 has an external thread on the rear part of its circumferential surface, and the inner wall of the first circular groove has an internal thread, which matches the external thread. The intake pipe 1 is threaded into the first circular groove.

[0031] In this embodiment, the internal and external threads can achieve a threaded seal between the air intake pipe 1 and the cavity 2, preventing air leakage in the cavity 2 and facilitating the disassembly of the air intake pipe 1.

[0032] Please refer to the details. Figure 1 The upper end of the hose 7 is fixedly connected to the lower end of the pulse inlet 3 via a quick-connect fitting, and the lower end of the hose 7 is fixedly connected to the first flow hole 14 located on the upper side via a quick-connect fitting. The upper end of the atmospheric pressure inlet 8 is fixedly connected to the first flow hole 14 located on the lower side via a quick-connect fitting.

[0033] In this embodiment, multiple quick-connect connectors facilitate the assembly and disassembly of the device.

[0034] Please refer to the details. Figure 4 Mechanical seal bearings 12 are fixedly connected to the inner circumference of the two first connecting holes 13, and the output shaft of the motor 9 is fixedly connected to the inner circumference of the two mechanical seal bearings 12.

[0035] In this embodiment: the mechanical seal bearing 12 connects to the output shaft of the motor 9, which can seal the fixed cavity 10. The mechanical seal bearing 12 can also support the rotation of the output shaft, reduce the coefficient of friction during its movement, and ensure its rotational accuracy.

[0036] Please refer to the details. Figure 3 The front end of the air intake pipe 1 is sealed, and multiple evenly distributed small holes 4 are opened on the circumferential surface of the air intake pipe 1.

[0037] In this embodiment, 20-40 small holes 4 with a diameter of less than 100μm are evenly distributed on the circumferential surface of the air intake pipe 1, forming a bubble generator. Bubbles can be generated through the air intake pipe 1 and injected into the cavity of the chamber 2.

[0038] The working principle and usage process of this invention: High-pressure liquid enters the fixed cavity 10 through the atmospheric pressure inlet 8. As the motor 9 drives the rotor 11 to rotate continuously, the first flow hole 14 and the four second flow holes 15 are constantly interlaced, causing the flow area to change periodically, thereby forming a pulse jet in the fixed cavity 10. The pulse jet enters the cavity 2 through the pulse inlet 3 through the hose 7, and interacts with a large number of bubbles emerging from the wall of the air inlet pipe 1 to form a bubble-like two-phase flow. A large number of small bubbles are broken and atomized into droplet fluid. Then the fluid is accelerated through the nozzle contraction section 5 and sprayed out from the nozzle 6. This device cleverly combines the characteristics of pulse atomization and bubble atomization technology, realizing the autonomous control of the atomization effect. The bubble particle size is smaller and the distribution is more uniform. After atomization, the average particle size of the droplets is smaller and the mixing effect with the surrounding environment is better. It can also achieve good working performance under non-standard working conditions.

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. An atomizing nozzle combining pulse excitation and bubble atomization, characterized in that: The device includes a cavity (2), a first circular groove is provided on the rear inner wall of the cavity (2), an air inlet pipe (1) is connected in the first circular groove, a nozzle (6) is provided at the front end of the cavity (2), a nozzle converging section (5) is provided on the rear inner wall of the nozzle (6), and the nozzle converging section (5) is connected to the cavity of the cavity (2), a second circular groove is provided on the circumferential surface of the cavity (2), and the second circular groove is connected to the cavity of the cavity (2), a pulse liquid inlet (3) is fixedly connected in the second circular groove, a hose (7) is connected to the lower end of the pulse liquid inlet (3), a liquid pressure regulating mechanism is provided on the lower side of the hose (7), and the liquid pressure regulating mechanism is connected to the hose (7) to realize the injection of pulse jet into the hose (7); the liquid pressure regulating mechanism includes a normal pressure liquid inlet (8), a motor (9), a fixed cavity (10), a rotor (11), a second connecting hole (16), and two second connecting holes (12). The fixed cavity (10) is connected to the lower end of the hose (7), and the rotor (11) is rotatably connected to the inner circumferential wall of the fixed cavity (10). The two first connecting holes (13) and the two first flow holes (14) are respectively opened on the upper and lower inner walls of the fixed cavity (10). The second connecting hole (16) is opened in the middle of the upper end of the rotor (11), and the second connecting hole (16) is matched with the two first connecting holes (13). The four second flow holes (15) are all opened at the upper end of the rotor (11), and the four second flow holes (15) are evenly distributed. The motor (9) is located on the lower side of the fixed cavity (10). The output shaft of the motor (9) is fixedly connected to the inner circumferential wall of the second connecting hole (16). The hose (7) and the atmospheric pressure inlet (8) are respectively connected to the two first flow holes (14).

2. The atomizing nozzle combining pulse excitation and bubble atomization according to claim 1, characterized in that: The rear part of the circumferential surface of the air intake pipe (1) is provided with an external thread, and the inner wall of the circumferential surface of the first circular groove is provided with an internal thread, and the internal thread matches the external thread. The air intake pipe (1) is threadedly connected to the first circular groove.

3. The atomizing nozzle combining pulse excitation and bubble atomization according to claim 2, characterized in that: The upper end of the hose (7) is fixedly connected to the lower end of the pulse inlet (3) via a quick-connect fitting. The lower end of the hose (7) is fixedly connected to the first flow hole (14) located on the upper side via a quick-connect fitting. The upper end of the atmospheric pressure inlet (8) is fixedly connected to the first flow hole (14) located on the lower side via a quick-connect fitting.

4. The atomizing nozzle combining pulse excitation and bubble atomization according to claim 3, characterized in that: Mechanical seal bearings (12) are fixedly connected to the inner circumference of the two first connecting holes (13), and the output shaft of the motor (9) is fixedly connected to the inner circumference of the two mechanical seal bearings (12).

5. The atomizing nozzle combining pulse excitation and bubble atomization according to claim 4, characterized in that: The front end of the air intake pipe (1) is sealed, and a number of evenly distributed small holes (4) are opened on the circumferential surface of the air intake pipe (1).

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