Atomization device

Abstract

The utility model relates to the field of atomizers, and discloses an atomizing device, which is characterized by comprising an atomizing pipe, the atomizing pipe comprises a contraction pipe, a throat pipe and a diffusion pipe, the inlet end of the throat pipe is connected with the outlet end of the contraction pipe, and the outlet end of the throat pipe is connected with the inlet end of the diffusion pipe; the contraction pipe is a conical pipe body with the inlet end caliber larger than the outlet end caliber, and the diffusion pipe is a conical pipe body with the inlet end caliber smaller than the outlet end caliber. A plurality of rotating rifling grooves are uniformly formed in the throat pipe; an inclined water injection opening is formed in the throat pipe in a penetrating mode and connected with a water injection pipe, and the caliber of the water inlet end of the water injection pipe is larger than that of the water outlet end of the water injection pipe.

Description

Technical Field

[0001] This utility model relates to the field of atomizers, and more specifically, to an atomizing device. Background Technology

[0002] Atomization technology has evolved from early mechanical atomization, such as centrifugal and pressure atomization, to a diversified range of technologies including ultrasonic, electrostatic, and Venturi atomization. In the 1950s, centrifugal atomizers became widespread, using a high-speed rotating disc to break up liquids, but producing large particles (greater than 50 μm), primarily used in agricultural spraying. In the 1970s, high-pressure atomizers emerged, relying on high-pressure pumps to pressurize liquids before spraying them from nozzles, achieving atomized particles of 10–30 μm, but with high energy consumption and complex structures. In the 1990s, ultrasonic atomization technology matured, utilizing high-frequency vibrations of piezoelectric ceramics to generate micron-sized particles (1–5 μm), but with high costs and only suitable for low-viscosity liquids. In the early 21st century, Venturi atomizers began to be used in fields such as medical humidification, relying on negative airflow pressure to achieve pump-free atomization, but problems such as uneven particle distribution and low atomization efficiency remain.

[0003] For scenarios such as the production of baijiu daqu (a type of starter culture), inoculation of microbial strains, and dust removal, uniform atomization of 5–10 μm, corrosion resistance, and low maintenance are required. Existing technologies have the following core defects:

[0004] The drawbacks of ultrasonic atomizers are: they rely on piezoelectric ceramic elements, which are prone to aging and breakage due to long-term high-frequency vibration, with a lifespan of no more than 2 years; they have high energy consumption, ranging from 200 to 500W, requiring continuous power supply; they are only suitable for low-viscosity liquids of no more than 10 cP, and cannot be adapted to Daqu (a type of starter culture) inoculum containing mycelium with a viscosity between 20 and 50 cP. They require frequent maintenance, have high energy costs, and the atomization into 1–5 μm particles easily leads to dehydration and inactivation of the bacteria.

[0005] The drawbacks of centrifugal atomizers are: coarse particles, ranging from 20 to 100 μm, poor uniformity, and a particle size standard deviation greater than 30%; high-speed motor noise exceeding 75 dB, affecting the production environment; and easily worn rotating parts requiring regular bearing replacement, with a maintenance cycle of up to 3 months. Uneven atomization affects the consistency of Daqu fermentation, while high noise and maintenance costs reduce production efficiency.

[0006] The drawbacks of high-pressure atomizers are: they rely on high-pressure pumps with pressures greater than 5 MPa, resulting in extremely high energy consumption, ranging from 800 to 1500 W; the nozzle orifice diameter is small, not exceeding 0.5 mm, making it easily clogged by solid impurities in the bacterial culture solution; and the high-pressure pipeline poses a risk of leakage, leading to poor safety. Frequent clogging necessitates shutdowns for cleaning, and the safety hazards of the high-pressure system restrict large-scale production.

[0007] The drawbacks of traditional Venturi atomizers are: uneven particle size, with SMD fluctuations exceeding 20% ​​due to insufficient gas-liquid mixing; weak negative pressure liquid absorption capacity (ΔP < 0.5 kPa), requiring additional pressurization equipment; and an unreasonable diffuser design resulting in high pressure loss at the output end, exceeding 15%, necessitating a high-power fan. The atomization quality is unstable, and the energy consumption and equipment cost offset the advantages of the Venturi structure. Utility Model Content

[0008] The purpose of this invention is to provide an atomizing device that uses the Venturi effect and swirling shear design to achieve high particle size atomization; at the same time, the uniformity of liquid atomization is improved through the coupling design of rotating rifling grooves and conical water injection inner diameter channels.

[0009] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an atomizing device, including an atomizing tube;

[0010] The atomizing tube includes a converging tube, a throat tube, and a diffuser tube. The inlet end of the throat tube is connected to the outlet end of the converging tube, and the outlet end of the throat tube is connected to the inlet end of the diffuser tube.

[0011] The contraction tube is a tapered tube with an inlet port diameter larger than the outlet port diameter, and the diffuser tube is a tapered tube with an inlet port diameter smaller than the outlet port diameter.

[0012] The throat tube is provided with several evenly arranged rotating rifling grooves.

[0013] An inclined water inlet is provided through the throat tube, and the water inlet is connected to a water injection pipe, the diameter of the water inlet of the water injection pipe being larger than the diameter of the water outlet.

[0014] As a preferred embodiment of this invention, the rotating rifling grooves are right-handed rotating rifling grooves.

[0015] As a preferred embodiment of this invention, the rotation angle of the rotating rifling groove is 15°.

[0016] As a preferred embodiment of this utility model, the angle between the inner wall of the shrink tube and the axis of the shrink tube is 25°.

[0017] As a preferred embodiment of this utility model, the angle between the axis of the water injection pipe and the axis of the throat pipe is 30°.

[0018] As a preferred embodiment of this utility model, four water inlets are evenly arranged on the throat pipe at the same axial position, and each water inlet is equipped with a water inlet pipe with the same axis as the water inlet.

[0019] As a preferred embodiment of this utility model, the throat tube has a smooth chamfer at the edge corresponding to the water inlet.

[0020] As a preferred embodiment of this utility model, the diffusion tube includes a front diffusion section and a rear diffusion section, wherein the diffusion angle corresponding to the inner wall of the front diffusion section is 12° and the diffusion angle corresponding to the inner wall of the rear diffusion section is 8°.

[0021] As a preferred embodiment of this utility model, the atomizing tube is a 316L stainless steel tube.

[0022] As a preferred embodiment of this utility model, the lead of the rotating rifling groove is 70 mm and the depth of the rotating rifling groove is 0.2 mm.

[0023] The length of the shrink tube is 60mm, and the inlet inner diameter of the shrink tube is 51mm;

[0024] The inner diameter of the throat is 18mm and the length is 20mm;

[0025] The inlet diameter of the water injection pipe is 1.8mm, and the outlet diameter of the water injection pipe is 1.2mm; the distance between the water injection port and the inlet of the shrink tube is 8mm.

[0026] The length of the diffuser tube is 120 mm.

[0027] In summary, this utility model has the following beneficial effects: A fan is connected to the inlet end of the contraction tube, and airflow is introduced into the contraction tube by starting the fan; the airflow reaches the throat tube after passing through the contraction of the contraction tube. Due to the change in pipe diameter, a high-speed airflow is generated in the throat tube, and a negative pressure is formed in the throat tube, thereby drawing the target liquid that is connected to the water inlet and the water inlet pipe with the inner diameter of the conical tube into the throat tube. The high-speed airflow is also affected by the swirling effect of the rotating rifling groove in the throat tube, thereby generating a high-speed rotating airflow. After the target liquid passes through the conical inner diameter hole, it enters the throat tube at high speed and is torn into a liquid film under the action of the rotating airflow to achieve deep fragmentation and obtain atomized particles; when the rotating airflow and atomized particles reach the diffuser tube, the flow rate is gradually reduced, the static pressure is restored, and the pressure-damped atomized particles are blown out in a natural flow state, thereby uniformly covering the target area.

[0028] The atomizing tube of this invention adopts the Venturi effect and swirling shear design to achieve high particle size atomization; at the same time, the uniformity of liquid atomization is improved by the coupling design of rotating rifling grooves and conical water injection inner diameter channel. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the rotating rifling groove of this utility model;

[0031] Figure 3 yes Figure 1 A schematic diagram of region A in the middle.

[0032] In the diagram: 1. Contraction tube; 2. Throat tube; 3. Diffuser tube; 4. Inlet; 5. Inlet pipe; 6. Rotating rifling groove. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0034] like Figure 1 As shown, this utility model provides an atomizing device, including an atomizing tube;

[0035] The atomizing tube includes a converging tube 1, a throat tube 2, and a diffuser tube 3. The inlet end of the throat tube 2 is connected to the outlet end of the converging tube, and the outlet end of the throat tube 2 is connected to the inlet end of the diffuser tube 3.

[0036] The contraction tube 1 is a tapered tube with an inlet diameter larger than the outlet diameter, and the angle between the inner wall of the contraction tube 1 and its axis is 25°. This optimizes the throat contraction ratio and, in conjunction with the water inlet 4, increases the negative pressure to achieve natural negative pressure water intake without the need for a booster pump.

[0037] The diffuser 3 is a tapered tube with an inlet diameter smaller than its outlet diameter. It comprises a front diffuser section and a rear diffuser section. The diffusion angle corresponding to the inner wall of the front diffuser section is 12°, and the diffusion angle corresponding to the inner wall of the rear diffuser section is 8°. This staged diffuser 3 allows for a smoother pressure recovery, reducing pressure loss at the output end, making it suitable for low-pressure fans and lowering energy consumption.

[0038] like Figure 2 As shown, the throat 2 is provided with several uniformly arranged rotating rifling grooves 6; specifically, the rotating rifling grooves 6 are right-handed rotating rifling grooves 6. The rotation angle of the rotating rifling grooves 6 is 15°. Through the rotating rifling grooves 6, the airflow is forced to rotate to form a swirling flow field, prolonging the gas-liquid contact time and causing the liquid film to be broken up and homogenized in a secondary manner.

[0039] like Figure 3As shown, an inclined water inlet 4 is provided through the throat 2, and a water inlet 4 is connected to a water inlet pipe 5. The inlet diameter of the water inlet pipe 5 is larger than the outlet diameter. The axis of the water inlet pipe 5 forms an angle of 30° with the axis of the throat 2. The conical water inlet 4 accelerates the jet and enhances the shearing ability for medium and high viscosity liquids.

[0040] like Figure 1 As shown, four water inlets 4 are evenly arranged on the throat tube 2 at the same axial position. Each water inlet 4 is equipped with a water inlet pipe 5 with the same axis as the water inlet 4 to ensure uniform liquid injection. The throat tube 2 is provided with a smooth chamfer at the edge corresponding to the water inlet 4.

[0041] The working principle and technical advantages of the atomizing tube of this utility model are as follows: A fan is connected to the inlet end of the contraction tube 1, and airflow is introduced into the contraction tube 1 by starting the fan; the airflow reaches the throat 2 after the contraction of the contraction tube 1. Due to the change in pipe diameter, a high-speed airflow is generated in the throat 2, and a negative pressure is formed in the throat 2, thereby drawing the target liquid that is connected to the water inlet 4 and the water inlet pipe 5 with the inner diameter of the conical tube into the throat 2. The high-speed airflow is also affected by the swirling effect of the rotating rifling groove 6 in the throat 2, thereby generating a high-speed rotating airflow. After the target liquid passes through the conical inner diameter hole, it enters the throat 2 at high speed and is torn into a liquid film under the action of the rotating airflow to achieve deep fragmentation and obtain atomized particles; when the rotating airflow and atomized particles reach the diffuser 3, the flow rate is gradually reduced, the static pressure is restored, and the pressure-damped atomized particles are blown out in a natural flow state, thereby uniformly covering the target area.

[0042] The atomizing tube of this invention adopts the Venturi effect and swirling shear design to achieve high particle size atomization; at the same time, the coupling design of the rotating rifling groove 6 and the conical water injection inner diameter channel improves the uniformity of liquid atomization.

[0043] In one embodiment of this utility model, the atomizing tube is made of 316L stainless steel. The entire structure is made of 316L stainless steel, which is corrosion-resistant, has no easily damaged parts, a theoretical lifespan of over 10 years, and reduces maintenance costs by 90%.

[0044] As one embodiment of this utility model, the atomizing tube of this invention is applied in the production of Baijiu Daqu (a type of starter culture for Chinese liquor), and the specific solution is as follows:

[0045] The atomizing tube is entirely made of 316L stainless steel, featuring corrosion resistance and high-temperature resistance, with a surface roughness Ra≤0.8μm. It is an axisymmetric cylindrical tube, 200mm in total length, 60mm in outer diameter, and 3mm in wall thickness, divided into three sections.

[0046] Constriction tube 1, from the air inlet to the inlet of throat tube 2, is 60mm long;

[0047] Throat 2, 20mm long, with built-in rotating rifling groove 6;

[0048] The diffuser tube 3 and the throat tube 2 have an outlet length of 120 mm from the outlet to the air outlet.

[0049] Regarding shrink tube 1:

[0050] The length of the shrink tube 1 is 60mm, and the inlet inner diameter of the shrink tube 1 is 51mm;

[0051] The inner diameter gradually decreases: it linearly shrinks from 51mm at the intake end to 18mm at the throat inlet, with a contraction angle of 25°.

[0052] Regarding trachea 2:

[0053] Inner diameter: 18mm, length: 20mm.

[0054] Rotary rifling groove 6-rifling structure: Lead: 70mm, right-hand helix, helix angle ≈15°; Depth: 0.2mm (microgroove structure, does not significantly increase pressure loss);

[0055] Function: Forces airflow to rotate to form a swirling flow field, enhancing gas-liquid shearing and mixing uniformity.

[0056] Regarding diffuser 3

[0057] The inner diameter gradually changes: it diffuses in two stages from 18mm at the outlet of throat 2 to 34mm at the outlet end.

[0058] Front section, 80mm long: diffusion angle 12°, inner diameter increased from 18mm to 26mm;

[0059] The rear section is 40mm long with a diffusion angle of 8° and an inner diameter that is increased from 26mm to 34mm.

[0060] Function: Smoothly restores pressure, prevents flow separation, and ensures output pressure loss <5%.

[0061] Regarding water inlet 4 and water pipe 5

[0062] The water inlet 4 is located 8mm upstream of the inlet of the throat pipe 2, and is 68mm from the air inlet.

[0063] Quantity and distribution: 4 water injection holes, evenly distributed around the circumference and spaced at 90° intervals, symmetrical design;

[0064] The inner diameter is a tapered hole, narrowing from 1.8mm at the inlet to 1.2mm at the outlet, with a taper ratio of 1:5;

[0065] Inclination angle: 30° inclined towards the airflow direction, with an angle of 30° to the pipe axis;

[0066] Liquid supply logic: The negative pressure of 1.1 kPa at the throat draws the liquid naturally from the storage tank, and the conical orifice accelerates the jet, enhancing the shearing effect with the swirling airflow.

[0067] Key connections and seals for the atomizing tube:

[0068] Air inlet interface: M56 external thread × 2, compatible with standard DN50 air hose;

[0069] Water inlet 4 interface: quick-connect φ4mm stainless steel pipe connector, pressure ≥0.3MPa;

[0070] Sealing requirements: All connections shall use fluororubber O-rings, with a temperature resistance of -20℃ to 200℃.

[0071] The working principle and process of the atomizing tube:

[0072] S1. Airflow driven: Low-pressure fan (36m) 3 / h, ≤2kPa) supply air to the inlet end, and the airflow is accelerated through the contraction tube 1 to the throat tube 2 (39.2m / s);

[0073] S2. Negative pressure water absorption: The high-speed airflow in the throat tube 2 generates a negative pressure of 1.1 kPa, which draws the Daqu bacteria liquid from the water inlet 4;

[0074] S3. Swirl atomization:

[0075] The liquid is torn into a liquid film in the swirling flow field of throat 2;

[0076] The water injection pipe 5 with a tapered inner diameter hole allows the water jet to collide with the swirling airflow, achieving secondary breakup of the liquid film with an SMD of approximately 5.2 μm.

[0077] S4. Low-pressure output: The flow rate is gradually reduced in diffuser 3 to restore static pressure. The pressure loss is <5%. The atomized particles are blown out in a natural flow state to evenly cover the Daqu culture medium.

[0078] Implementation example of an atomizing tube:

[0079] Suitable liquid: Baijiu Daqu starter culture liquid, viscosity ≤50cP, containing mycelial particles ≤100μm;

[0080] Intake flow rate: 36m³ 3 / h;

[0081] Liquid flow rate: 0.5–1.2 L / min, adjustable via liquid level difference of 11–25 cm;

[0082] Atomized particle size: 5–10 μm, measured by laser particle size analyzer, standard deviation <15%.

[0083] Key processing techniques for atomizing tubes:

[0084] Shrink tube 1 / Diffuser tube 3: The inner cavity is machined by a five-axis CNC machine tool to ensure linear gradient accuracy of ±0.1mm;

[0085] Rotating rifling groove 6: Electrochemical etching, current density 3A / dm 2 Etching time: 15 minutes;

[0086] Water inlet 4: Fiber laser drilling, power 30W, pulse frequency 1kHz, taper grinding and polishing.

[0087] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An atomising device characterised in that: The atomizing pipe comprises a converging pipe (1), a throat pipe (2) and a diffusion pipe (3), the inlet end of the throat pipe (2) is connected with the outlet end of the converging pipe (1), and the outlet end of the throat pipe (2) is connected with the inlet end of the diffusion pipe (3). The converging pipe (1) is a tapered pipe body with a larger inlet diameter than outlet diameter, and the diffusion pipe (3) is a tapered pipe body with a smaller inlet diameter than outlet diameter. A plurality of rotating rifling grooves (6) are arranged uniformly in the throat pipe (2). An inclined water injection port (4) is arranged through the throat pipe (2), and a water injection pipe (5) is connected with the water injection port (4), wherein the inlet diameter of the water injection pipe (5) is larger than the outlet diameter. The rotating rifling grooves (6) are right-handed.

2. An atomising device according to claim 1, characterised in that: The rotating angle of the rotating rifling grooves (6) is 15°.

3. An atomising device according to claim 2, wherein: The included angle between the inner wall of the converging pipe (1) and the axis of the converging pipe (1) is 25°.

4. An atomising device according to claim 3, wherein: The included angle between the axis of the water injection pipe (5) and the axis of the throat pipe (2) is 30°.

5. An atomising device according to claim 4, wherein: Four water injection ports (4) are arranged uniformly at the same axial position on the throat pipe (2), and each water injection port (4) is provided with a water injection pipe (5) with the same axis as the water injection port (4).

6. An atomising device according to claim 5, wherein: A smooth chamfer is arranged at the edge of the throat pipe (2) corresponding to the water injection port (4).

7. An atomising device according to claim 6, characterised in that: The diffusion pipe (3) comprises a diffusion front part and a diffusion rear part, the corresponding diffusion angle of the inner wall of the diffusion front part is 12°, and the corresponding diffusion angle of the inner wall of the diffusion rear part is 8°.

8. The atomizing device of claim 1, wherein: The atomizing pipe is a 316L stainless steel pipe body.

9. An atomising device according to claim 8, characterised in that:

10. The atomizing device according to claim 9, wherein: The lead of the rotating rifling grooves (6) is 70 mm, and the depth of the rotating rifling grooves (6) is 0.2 mm. The length of the converging pipe (1) is 60 mm, and the inlet inner diameter of the converging pipe (1) is 51 mm. The inner diameter of the throat pipe (2) is 18 mm, and the length is 20 mm. The inlet diameter of the water injection pipe (5) is 1.8 mm, and the outlet diameter of the water injection pipe (5) is 1.2 mm; the distance between the water injection port (4) and the inlet of the converging pipe (1) is 8 mm. The length of the diffusion pipe (3) is 120 mm. ​

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