A pipeline air atomizing nozzle

Abstract

The present invention belongs to the technical field of aircraft environmental control systems and relates to a pipeline-type air atomizing nozzle; comprising a nozzle body, a nozzle core, and a nozzle nozzle; the nozzle body is sealed and installed with the nozzle core, and the nozzle body is sealed and installed with the nozzle nozzle; the nozzle body is composed of an air supply port, a gas buffer chamber, and an atomizing chamber; the air supply port is the inlet of the gas medium; the gas buffer chamber serves to stabilize the air pressure and is used to transport the gas medium; the atomizing chamber is a chamber in which the liquid medium and the gas medium are atomized inside the air atomizing nozzle; the nozzle core is cylindrical and consists of a liquid supply port, a liquid spray hole, a gas spray hole, and a gas-liquid atomizing chamber. The pipeline-type air atomizing nozzle provided by the present invention reduces the contact between the atomizing medium and the inner wall of the pipeline, and the atomizing medium and the fluid medium inside the pipeline can be fully mixed and reacted in a confined space, thereby greatly improving the control quality of parameters such as temperature and humidity of the fluid medium in the pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft environmental control systems, and in particular relates to a pipeline type air atomizing nozzle. Background Art

[0002] Air atomizing nozzles can produce ultra-fine mist particles and are widely used in industrial and agricultural production fields to humidify the environment, cool the environment, prevent and control haze, and suppress dust, greatly improving human living and living environment.

[0003] Currently, most air atomizing nozzles on the market are designed for use in open-space environments. Existing atomizing nozzles cannot be directly used in specialized confined space applications such as gas humidification, cooling, gas combustion, and icing parameter simulation within pressure pipes. Although a few nozzles can be modified to be installed diagonally or vertically on the pipe, in this case, the majority of the atomized droplets will be sprayed directly onto the inner wall of the pipe, where they mix extremely unevenly with the fluid flowing within. This results in low mixing efficiency, short reaction times, and the inability to achieve the desired control targets for parameters such as the temperature and humidity of the fluid within the pipe.

[0004] Existing ice detection simulation equipment (such as CN201610296391.5, etc.) all belong to the simulation of ice parameters of larger component-level test pieces. They are not suitable for simulating ice parameters of micro-part-level test pieces used in pipelines (≯DN100mm). The nozzle needs to be redesigned according to technical index requirements. The sizes of the two differ by dozens of times. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipeline air atomizing nozzle to solve the above problems in the prior art.

[0006] The technical solution of the present invention:

[0007] A pipeline air atomizing nozzle comprises: a nozzle body, a nozzle core, and a nozzle head; the nozzle body and the nozzle core are sealed and installed, and the nozzle body and the nozzle head are sealed and installed;

[0008] The nozzle body is composed of an air supply port, a gas buffer chamber, and an atomizing chamber;

[0009] The gas supply port is the inlet of the gas medium;

[0010] The gas buffer chamber serves to stabilize the gas pressure and is used to transport the gas medium;

[0011] The atomizing chamber is a chamber where the liquid medium and the gas medium are atomized inside the air atomizing nozzle. The length of the atomizing chamber is 10 to 20 mm, which is usually 2 to 3 times the diameter D of the atomizing chamber.

[0012] The nozzle core is cylindrical and consists of a liquid supply port, a liquid spray hole, a gas spray hole, and a gas-liquid atomization cavity.

[0013] The liquid supply port is the inlet of the liquid medium.

[0014] The liquid spray hole is a cylindrical elongated hole, the purpose of which is to increase the flow rate of the liquid medium and accelerate the collision and breakup of the gas-liquid two phases.

[0015] The gas spray holes are located on the conical surface at the bottom of the nozzle core body, are evenly distributed along the axis, and connect the gas buffer cavity of the nozzle body and the gas-liquid atomization cavity of the nozzle core body.

[0016] In the gas-liquid atomization cavity, the liquid medium flowing through the liquid spray hole and the gas medium flowing through the gas spray hole meet and collide for the first time.

[0017] The nozzle head is in a cone-shaped shape, with 2 to 6 atomizing spray holes symmetrically distributed on the cone surface along the axis.

[0018] The aperture φd1 of the liquid nozzle, the aperture φd2 of the gas nozzle, and the aperture φd3 of the atomizing nozzle satisfy the following relationship:

[0019] 1) Calculate the aperture φd1 of the liquid nozzle, the aperture φd2 of the gas nozzle, and the aperture φd3 of the atomizing nozzle based on the liquid medium flow rate, liquid supply pressure, gas supply pressure, and atomized droplet diameter.

[0020] 2) The greater the gas-liquid ratio entering the atomizing nozzle, the smaller the atomized droplets. To enhance the atomizing effect of the atomizing nozzle, the aperture φd2 of the gas nozzle can be increased by 0-20%, and the aperture φd3 of the atomizing nozzle can be reduced by 0-20%.

[0021] 3) The number of gas nozzles is 2 to 6. The determining factors are: the smaller the diameter of the gas nozzle holes and the greater the number, the smaller the atomized droplets produced. When the number of nozzle holes exceeds 6, the atomized droplets do not change significantly.

[0022] 4) The number of atomizing nozzles is 2 to 6. The determining factors are: the smaller the diameter of the atomizing nozzles and the greater the number, the smaller the atomized droplets produced. When the number of nozzles exceeds 6, the change in atomized droplets is not obvious;

[0023] The lengths H1 and H2 of the nozzle body and the nozzle core need to be determined according to the inner diameter of the specific pipeline to ensure that the nozzle head is located on the central axis of the pipeline.

[0024] Although, the smaller the atomizing nozzle aperture and the greater the number, the greater the gas-liquid ratio entering the atomizing nozzle, and the smaller the atomized droplets produced by the atomizing nozzle; however, in order to make the atomizing nozzle spray out ultrafine atomized droplets of 20-50 microns, the number of atomizing nozzle holes and gas nozzle holes needs to be determined in combination with the length H1 of the nozzle body and the length H2 of the nozzle core. After simulation calculation, preferably, the number of atomizing nozzle holes and gas nozzle holes is 4.

[0025] The central axis of the nozzle head should coincide with the central axis of the installation pipe of the air atomizing nozzle.

[0026] The outside of the nozzle body is also provided with a mounting flange, and the mounting flange is used to fix the air atomizing nozzle on the pipeline.

[0027] The nozzle body and the nozzle core are connected through threads and sealed by a sealing ring.

[0028] The nozzle body and the nozzle head are connected through threads and sealed by a sealing ring.

[0029] The pipeline air atomizing nozzle is used for icing parameter simulation, high-pressure gas humidity simulation, cooling simulation, etc.

[0030] Beneficial effects of the present invention:

[0031] The liquid medium of the present invention is accelerated, collided, broken, and initially atomized by the gas medium in the atomization chamber, and is secondarily atomized through the atomization nozzle hole to finally form ultrafine particles. The ultrafine particles enter the pipeline and flow countercurrently with the medium flowing inside the pipeline and are fully mixed, thereby achieving the purposes of full combustion, temperature control, humidity control, and freezing.

[0032] The pipeline air atomizing nozzle provided by the present invention reduces the contact between the atomizing medium and the inner wall of the pipeline. The atomizing medium and the fluid medium inside it can be fully mixed and reacted in a confined space, thereby greatly improving the control quality of parameters such as temperature and humidity of the fluid medium in the pipeline; it adopts a modular design and can be applied to different industrial scenarios by replacing different nozzle bodies, nozzle cores, and nozzle heads, which helps to reduce costs; it has a wide range of applications. By selecting different gas media and liquid media, the present invention can be used in air humidification, cooling, combustion, freezing and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of the air atomizing nozzle of the present invention;

[0034] Figure 2 This is a schematic structural diagram of the nozzle body of the present invention;

[0035] Figure 3 Schematic diagram of the nozzle core structure of the present invention;

[0036] Figure 4It is a schematic diagram of the nozzle structure of the present invention. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] The following describes the air atomizing nozzle of the present invention applied to pipes with the accompanying drawings and specific embodiments. The pipe diameter is ≯DN100mm and can be used in the fields of simulating icing parameters of micro-ice wind tunnels, high-temperature and high-pressure bleed air humidity of aircraft engines, and gas cooling and combustion in pipes. Figure 1 The figure shows the overall structure of the pipeline air atomizing nozzle, which includes a nozzle body 1, a nozzle core 2, a nozzle head 3, a first sealing ring 4, a second sealing ring 5 and a third sealing ring 6.

[0039] The pipeline type air atomizing nozzle, the nozzle body 1 and the nozzle core 2 are connected by threads, and sealed by the first sealing ring 4 and the second sealing ring 5, and the body 1 and the nozzle head 3 are connected by threads and sealed by the third sealing ring 6, forming a complete air atomizing nozzle;

[0040] The nozzle body 1 is equipped with an air supply port 1.1, a mounting flange 1.2, a gas buffer chamber 1.3, and an atomizing chamber 1.4. The air supply port 1.1 is connected to the air supply pipeline, allowing the gas medium to enter the nozzle. The mounting flange 1.2 is connected to the pipeline, allowing the generated ultrafine droplets to enter the pipeline along the central axis and fully mix with the medium inside. The inner wall of the nozzle body 1 and the outer wall of the nozzle core 2 form a gas buffer chamber 1.3, ensuring uniform and stable pressure of the gas medium inside the nozzle. The length H1 of the nozzle body is related to the radius R of the mounting pipeline: H1 = 60mm + R.

[0041] The nozzle core 2 is equipped with a liquid supply port 2.1, liquid spray holes 2.2, gas spray holes 2.3, and a gas-liquid atomization chamber 2.4. Liquid enters through the liquid supply port 2.1, flows through the liquid spray holes 2.2, and meets the gas flowing through the gas spray holes 2.3 in the gas-liquid atomization chamber 2.4. The length H2 of the nozzle core is related to the radius R of the installation pipe: H2 = 40 mm + R.

[0042] The nozzle head 3 structure is as follows Figure 4 As shown, an atomizing nozzle 3.1 and a spray chamber 3.2 are provided. The spray chamber 3.2 is combined with the gas-liquid atomizing chamber 2.4 and the atomizing chamber 1.4 to form a primary atomizing chamber. The liquid medium is atomized by the gas medium in the primary atomizing chamber for the first time, and the atomized droplets are atomized for the second time through the atomizing nozzle 3.1.

[0043] The first sealing ring 4 isolates the gas medium in the gas buffer chamber 1.3 from the external environment to prevent the gas from leaking to the external environment.

[0044] The second sealing ring 5 isolates the gas medium in the gas buffer chamber 1.3 from the gas-liquid two-phase medium in the atomizing chamber 1.4, and prevents the gas medium from directly entering the atomizing chamber 1.4 without passing through the gas nozzle 2.3.

[0045] The third sealing ring 6 isolates the gas-liquid two-phase medium from the fluid medium in the pipeline, and prevents the gas-liquid two-phase medium in the nozzle from leaking into the pipeline.

[0046] In the pipeline air atomizing nozzle, the gas medium enters the nozzle through the gas supply port 1.1 and the liquid medium enters the nozzle through the liquid supply port 2.1. According to the pressure of the fluid medium in the pipeline and the required control parameters, the liquid supply flow rate and gas pressure are adjusted to control the particle size produced by the atomizing nozzle. The specific steps are as follows:

[0047] Step 1: Use a particle size analyzer to calibrate the corresponding relationship between liquid supply flow rate, gas pressure and atomized droplet size. Under a certain liquid supply flow rate, calibrate the atomized droplet size of the atomizing nozzle under different gas supply pressures and record it;

[0048] Step 2: Change the liquid supply flow rate, recalibrate the atomizing nozzle's atomized droplet size under different air supply pressures, and record the results;

[0049] Step 3: Refer to the above calibration results, supply the required liquid flow rate according to the required atomized droplet size and liquid supply flow rate, and adjust the gas supply pressure.

[0050] The aperture φd1 of the liquid nozzle, the aperture φd2 of the gas nozzle, and the aperture φd3 of the atomizing nozzle satisfy the following relationship:

[0051]

[0052] Where: q L is the liquid medium flow rate, μ1 is the liquid medium flow coefficient, P q is the atomization liquid supply pressure, β k is the critical pressure ratio of the atomizing gas, P q is the atomizing air supply pressure, γ1' is the density of the liquid medium.

[0053]

[0054] Where: G is the gas flow rate, μ2 is the flow coefficient of compressed air in the atomizing chamber, n2 is the number of gas nozzles, φ k is the critical interface flow calculation coefficient, and ν2 is the specific volume of compressed air.

[0055]

[0056] Where: μ3 is the outlet flow coefficient of the atomizing chamber, ν3 is the specific volume of the atomizing chamber medium, n3 is the number of atomizing nozzle holes, P h is the atomization chamber pressure.

[0057] The length L and diameter D of the atomizing chamber satisfy the following relationship:

[0058]

[0059] Where: ω3 is the flow velocity in the atomization chamber, 15~20m / s.

[0060] Through the above-mentioned particle size control method and atomizing nozzle design, the atomizing nozzle 3.1 can finally spray out ultrafine atomized droplets of 20 to 50 microns, which are fully mixed and reacted with the fluid medium in the pipeline, thereby achieving the corresponding control target of the fluid medium in the pipeline.

[0061] The above description is merely a detailed description of specific embodiments of the present invention. Any unspecified portions are conventional techniques. However, the scope of the present invention is not limited thereto. Any changes or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be encompassed within the scope of the present invention. The scope of the present invention shall be determined by the scope of the claims.

Claims

1. A pipeline air atomizing nozzle, characterized by: include: Nozzle body, nozzle core, nozzle head; the nozzle body and the nozzle core are sealed and installed, and the nozzle body and the nozzle head are sealed and installed; The nozzle body is composed of an air supply port, a gas buffer chamber, and an atomizing chamber; The gas supply port is the inlet of the gas medium; The gas buffer chamber serves to stabilize the gas pressure and is used to transport the gas medium; The atomizing chamber is a chamber where the liquid medium and the gas medium are atomized inside the air atomizing nozzle; the length L of the atomizing chamber is 6 to 20 mm, and L is 2 to 3 times the diameter D of the atomizing chamber; The nozzle core is cylindrical and consists of a liquid supply port, a liquid spray hole, a gas spray hole, and a gas-liquid atomization cavity; The liquid spray hole is a cylindrical elongated hole, the purpose of which is to increase the flow rate of the liquid medium and accelerate the collision and breakup of the gas-liquid two phases; The gas spray holes are located on the conical surface at the bottom of the nozzle core body, are evenly distributed along the axis, and connect the gas buffer cavity of the nozzle body with the gas-liquid atomization cavity of the nozzle core body; The nozzle head is conical, with 2 to 6 atomizing nozzle holes symmetrically distributed on the cone surface along the axis; In order to make the atomizing nozzle spray out ultrafine atomized droplets of 20-50 microns, the aperture φd1 of the liquid nozzle, the aperture φd2 of the gas nozzle, and the aperture φd3 of the atomizing nozzle satisfy the following relationship: The aperture φd1 of the liquid spray hole depends on the liquid supply flow rate, which is related to the liquid pressure entering the atomizing nozzle and the pressure of the operating environment; The aperture φd2 of the gas nozzle depends on the gas supply flow rate and the gas pressure entering the atomizing nozzle; The diameter φd3 of the spray hole in the atomizing chamber depends on the air supply flow rate, the liquid supply flow rate and their ratio, and the atomizing chamber pressure; The liquid supply port is the inlet of the liquid medium; In the gas-liquid atomization cavity, the liquid medium flowing through the liquid spray hole and the gas medium flowing through the gas spray hole meet and collide for the first time.

2. The pipeline air atomizing nozzle according to claim 1, characterized in that: The number of the gas injection holes is 2 to 6.

3. The pipeline air atomizing nozzle according to claim 1, characterized in that: The length H1 of the nozzle body and the length H2 of the nozzle core need to be determined according to the inner diameter of the specific pipeline to ensure that the nozzle head is located on the central axis of the pipeline.

4. The pipeline air atomizing nozzle according to claim 1, characterized in that: The number of the atomizing nozzles and the gas nozzles is 4.

5. The pipeline air atomizing nozzle according to claim 1, characterized in that: The central axis of the nozzle head should coincide with the central axis of the installation pipe of the air atomizing nozzle.

6. The pipeline air atomizing nozzle according to claim 1, characterized in that: The outside of the nozzle body is also provided with a mounting flange, and the mounting flange is used for fixing the air atomizing nozzle on the pipeline.

7. The pipeline air atomizing nozzle according to claim 1, characterized in that: The nozzle body and the nozzle core are connected through threads and sealed by a sealing ring.

8. The pipeline air atomizing nozzle according to claim 1, characterized in that: The nozzle body and the nozzle head are connected through threads and sealed by a sealing ring.

9. The pipeline air atomizing nozzle according to claim 1, characterized in that: The pipeline air atomizing nozzle is used for icing parameter simulation, high-pressure gas humidity simulation, and cooling simulation.

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