A device for generating trace particle salt mist

Abstract

The present invention discloses a device for generating a micro-particle salt mist, comprising a generating box with a salt mist outlet at the top and an air injector placed in the generating box, wherein the air injector is placed below the artificial seawater level of the generating box, and a plurality of the air injectors are connected in series to form an air injection unit, and the on-off of the process gas of the air injection unit is controlled by an electromagnetic switch valve; and a plurality of the air injection units are installed in parallel in the generating box. After the high-pressure process air of the present invention enters the air injector, it is ejected from the annularly distributed multi-holes after passing through the internal airflow acceleration channel, and the ejected high-speed airflow stirs and breaks the liquid surface to form salt mist generation, and the generated salt mist particles flow out from the top outlet of the generating box along with the airflow, and are transported to the test area, and after being diluted by the atmosphere of the test area space environment, the environmental simulation of the atmospheric micro-salt mist content can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of salt mist generation, in particular to a trace particle salt mist generating device. Background Art

[0002] The marine salt spray environment is a very typical atmospheric environment. The salt spray environment will cause extremely strong damage to products and materials. Therefore, equipment that works in this environment for a long time needs to undergo salt spray testing during the development process. At present, the main method of salt spray testing is to conduct salt spray accelerated testing in a salt spray chamber. Salt is mainly used to simulate salt spray deposition, and its value is generally several times or dozens of times that of the salt spray deposition in the natural environment.

[0003] The mature salt spray generating devices currently used in salt spray chambers mainly use atomizing nozzles. The characteristics of this method are: (1) the particle size of the generated salt spray is large, with the median diameter basically above 30 μm, which is convenient for sedimentation; (2) the amount of generated spray is large, which meets the requirements of accelerated testing.

[0004] For aircraft engines flying in coastal environments, the impact of marine salt spray environment is the result of the combined effects of mechanical effects, electrical effects and corrosion effects, and the performance of aircraft engines will also change due to the impact of salt spray environment. Therefore, GJB 242-2018 "General Specifications for Aviation Turbopropeller and Turboshaft Engines" specifically points out that aircraft engines need to undergo salt spray corrosion sensitivity tests to assess the comprehensive impact of marine salt spray environment on engines in working and storage states. In the corrosion sensitivity test of aircraft engines, it is required to simulate the salt spray environment with atmospheric salt spray content, while more than 90% of the salt spray particles suspended in the atmosphere for a long time in the natural environment are below 5μm in particle size, and the salt spray content is only 200ppb, while the marine environment air salt spray content simulated in the ship equipment test is tens or even hundreds of ppm.

[0005] The salt spray content and particle size are crucial to the effect of salt spray, but conventional mature salt spray chambers and ship equipment salt spray environment simulation equipment cannot meet the requirements of trace particles in aircraft engine corrosion sensitivity tests. Summary of the invention

[0006] The purpose of the present invention is to provide a trace particle salt mist generating device in view of the technical defects existing in the prior art, which generates mist by breaking the liquid surface with high-pressure air and performs secondary screening on the atomized particles, thereby realizing the generation of micro-particle salt mist to meet the needs of simulating trace atmospheric salt mist environment in corrosion sensitivity tests of products such as aircraft engines.

[0007] The technical solution adopted to achieve the purpose of the present invention is:

[0008] A micro-particle salt mist generating device, comprising:

[0009] A generating box with a salt mist outlet at the top and an air injector placed in the generating box, the air injector is placed below the artificial seawater level of the generating box, a plurality of the air injectors are connected in series to form an air injection unit, and the on-off of the process gas of the air injection unit is controlled by an electromagnetic switch valve; a plurality of the air injection units are installed in parallel in the generating box; after the high-pressure process air enters the air injector, it is ejected from the annularly distributed multi-holes after passing through the internal airflow acceleration channel, and the ejected high-speed airflow stirs and breaks the liquid surface to form salt mist generation, and the generated salt mist particles flow out from the top outlet of the generating box along with the airflow and are transported to the test area, and after being diluted by the atmosphere of the test area space environment, the environmental simulation of the atmospheric micro-salt mist content can be realized.

[0010] Preferably, the main body of the air injector is a cylinder, and a coaxial process gas inlet blind hole is formed at the bottom of the interface at the axial center, and gas ejection holes are arranged in a ring on the outer surface of the cylinder. The gas ejection holes extend into the interior of the cylinder and communicate with the middle of the process gas inlet blind hole, and the central axis is perpendicular to the central axis of the cylinder.

[0011] Preferably, an air hole corresponding to the gas ejection hole is formed on the side wall of the process gas inlet blind hole, and the air hole is connected to the inner end of the gas ejection hole through an internal airflow acceleration channel formed by a reduced diameter hole portion, a same diameter connecting hole portion, and an expanded diameter hole portion in sequence, and the diameter of the gas ejection hole is the same as the diameter of the wide mouth side of the expanded diameter portion.

[0012] Preferably, an atomized particle screener is installed on the top of the salt mist outlet of the generating box, including a conical portion at the bottom and a discharge portion at the top, the discharge portion is composed of two ring bodies separated from each other up and down and connected together by a plurality of spaced-apart columns arranged in a ring, a salt mist inlet is formed between the two ring bodies and the columns, and a salt mist discharge outlet is formed inside the ring body, which is used for secondary screening of the salt mist particles moving with the airflow, so that particles with smaller particle size can better follow the airflow.

[0013] Preferably, the generating box is connected to a brine tank for storing artificial seawater required for salt mist generation via a delivery pump, and the delivery pump is used to replenish liquid into the generating box and to draw liquid from the generating box to the brine tank for drainage.

[0014] Preferably, the brine tank is equipped with a low liquid level alarm switch for water shortage alarm, and a drain valve is provided at the bottom for draining the residual liquid in the tank.

[0015] Preferably, a liquid level meter is installed in the generator box, and the delivery pump controls the flow of seawater entering the generator box in a closed loop through the measured value of the liquid level meter, thereby achieving stable control of the liquid level height in the generator box.

[0016] Preferably, a seawater flowmeter is installed on the liquid replenishment pipeline between the delivery pump and the brine tank, and a gas flowmeter is installed on the gas line supplying high-pressure process gas. The real-time mist generation amount of the salt mist generating device is obtained by the numerical ratio of the gas flowmeter and the artificial seawater flowmeter.

[0017] Preferably, the gas path of the high-pressure process gas is also provided with a heater, a temperature sensor for controlling the heater arranged on the downstream side of the heater, a pressure regulating valve arranged on the downstream side of the gas flow meter, a pressure sensor for controlling the pressure regulating valve arranged between the pressure regulating valve and the heater, and a fine filter arranged on the upstream side of the gas flow meter; the temperature sensor is arranged upstream of the electromagnetic switch valve.

[0018] Preferably, the micro-particle salt mist generating device further comprises a salt water tank, an equipment box, a control box and a touch screen. The equipment box is used for cleaning high-pressure air and regulating temperature and pressure. The equipment box contains a fine filter, a pressure regulating valve, a heater, an electromagnetic switch valve, a gas flow meter, a temperature sensor, and a pressure sensor. The control box is used to install a controller of the micro-particle salt mist generating device to realize full-automatic control and working status monitoring of the micro-particle salt mist generating device. The touch screen is used for upper computer display and control, which is convenient for user operation.

[0019] The salt water tank, the generator box and the equipment box are fixedly mounted on the overall bottom plate, and the salt water tank and the equipment box are respectively placed on both sides of the generator box, so as to prevent the equipment in the equipment box from being corroded by the artificial seawater in the salt water tank. The control box and the touch screen are placed above the equipment box to facilitate control wiring and user operation.

[0020] The micro-particle and trace salt mist generating device of the present invention adopts a method of high-pressure air breaking liquid surface combined with atomized particle screening, which can achieve the goal of small salt mist generation amount and small average particle size, thereby more realistically simulating the natural salt mist environment. The micro-particle and trace salt mist generating device of the present invention can adopt a method of combining multiple air injectors and regulating air supply pressure to achieve wide range regulation of trace salt mist generation amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the system architecture of the micro-particle and trace salt mist generating device of the present invention;

[0022] Figure 2 A schematic diagram of the system working principle of the micro-particle and trace salt mist generating device of the present invention;

[0023] Figure 3-Figure 4 A schematic structural diagram of an air injector of a particle trace salt mist generating device of the present invention;

[0024] Figure 5 A schematic structural diagram of an atomized particle screener of a micro-particle and trace salt mist generating device of the present invention;

[0025] In the figure: 1 fine filter; 2 gas flow meter; 3 pressure regulating valve; 4 pressure sensor; 5 heater; 6 temperature sensor; 7 electromagnetic switch valve; 8 air ejector; 9 liquid level gauge; 10 delivery pump; 11 artificial seawater flow meter; 12 salt water tank; 13 drain valve; 14 low liquid level alarm switch; 15 cone; 16 ring; 17 column; 18 salt spray inlet; 19 salt spray outlet;

[0026] 100 base plate; 200 brine tank; 300 generator box; 400 equipment box; 500 touch screen; 600 control box. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] like Figure 1-Figure 5 As shown, the micro-particle salt mist generating device of the embodiment of the present invention comprises:

[0029] Brine tank 200, generator box 300, equipment box 400, control box 600 and touch screen 500. The brine tank is mainly used to hold artificial seawater. The brine tank contains a liquid outlet, a liquid level gauge, a low liquid level alarm switch, and a drain valve. The brine tank wall is also equipped with a delivery pump and a flow meter for the delivery of artificial seawater. The generator box is mainly used for salt spray generation. The generator box contains an air ejector, a liquid level gauge, an atomized particle filter, and a liquid inlet. The equipment box is mainly used for the cleaning of high-pressure air and the adjustment of temperature and pressure. The equipment box contains a fine filter, a pressure regulating valve, a heater, an electromagnetic switch valve, a gas flow meter, a temperature sensor, and a pressure sensor. The control box is mainly used to install the controller of the generator to realize the full automatic control and working status monitoring of the device. The touch screen is used for upper computer display and control, which is convenient for user operation.

[0030] In the embodiment of the present invention, as a preferred solution, the salt water tank, the generator box, and the equipment box are fixedly mounted on the integral bottom plate 100, and the salt water tank and the equipment box are respectively placed on both sides of the generator box, thereby preventing the equipment in the equipment box from being corroded by the artificial seawater in the salt water tank. The control box and the touch screen are placed above the equipment box to facilitate control wiring and user operation.

[0031] like Figure 2As shown, in the embodiment of the present invention, during use, the air source is connected to the inlet of the fine filter device 1 to realize high-pressure air oil mist separation, water mist separation, drying, etc. After filtration, the high-pressure air enters the gas flow meter 2 to realize the measurement of the high-pressure air supply flow rate. The outlet of the gas flow meter 2 is connected to the pressure regulating valve 3. The pressure regulating valve 3 is used to adjust the air supply pressure and measure the feedback value through the pressure sensor 4 on the air supply pipeline for precise closed-loop control. The pressure-regulated air enters the heater 5 for temperature regulation. The heater 5 can measure the feedback value through the temperature sensor 6 on the air supply pipeline for precise closed-loop control. Then the airflow passes through the multi-way parallel electromagnetic switch valve 7 and then enters the air injector 8. The air injector 8 can be connected in series through the air circuit by an electromagnetic switch valve 7 to control the overall airflow interruption. The wide range of salt spray generation can be adjusted by the number of air injectors 8 in series and the number of electromagnetic switch valves 7 in parallel.

[0032] The structure of the air injector 8 of the embodiment of the present invention is as follows: Figure 3 , Figure 4 As shown, the main body of the air injector is a cylinder, and a coaxial process gas inlet blind hole 21 is formed at the bottom of the interface 20 at the axial center, and a gas ejection hole 22 is arranged in a ring on the outer circumferential surface of the cylinder, and the gas ejection hole extends into the interior of the cylinder and communicates with the middle of the process gas inlet blind hole, and the central axis is perpendicular to the central axis of the cylinder; air holes corresponding to the gas ejection holes are formed on the side walls of the process gas inlet blind hole, and the air holes are connected to the inner end of the gas ejection hole 22 through an internal airflow acceleration channel 23 formed by a reduced diameter hole portion, a same diameter connecting hole portion, and an expanded diameter hole portion in sequence, and the diameter of the gas ejection hole is the same as the diameter of the wide mouth side of the expanded diameter portion.

[0033] like Figure 3 , Figure 4 As shown, after high-pressure air enters the air injector 8, it is ejected from the annularly distributed multi-holes after passing through the internal airflow acceleration channel. The air injector 8 is placed below the artificial seawater level of the generating box, or arranged horizontally in one layer, or arranged in two or three layers up and down. The ejected high-speed airflow stirs and breaks the liquid surface to form salt mist generation. The salt mist particles flow out from the top outlet of the generating box with the airflow and are transported to the target area. The top outlet of the generating box is equipped with an atomized particle screener, and its structure is as shown in FIG. Figure 5As shown, the outlet installed at the top of the generating box includes a conical portion 15 at the bottom and a discharge portion at the upper portion, wherein the discharge portion is composed of two ring bodies 16 separated from each other up and down and connected together by a plurality of spaced columns arranged in a ring shape, a salt mist inlet 18 is formed between the two ring bodies and the columns 17, the upper surface of the upper ring body is flush with or slightly higher than the upper surface of the generating box, a salt mist inlet is formed between the two ring bodies and the columns inside the generating box, a salt mist discharge port 19 is formed inside the ring body, the salt mist moving from bottom to top is divided by the downward conical portion with the help of the lower cone tip, and after the flow is guided, the salt mist passes through a U-shaped deflection at its periphery and then enters the interior of the ring body through the salt mist inlet and is discharged from the upper end, thereby performing secondary screening on the salt mist particles moving with the airflow, and particles with smaller particle sizes can better follow the airflow around.

[0034] The brine tank 12 of the embodiment of the present invention is used to store the artificial seawater required for the generation of salt fog. A low liquid level alarm switch 14 is installed in the brine tank 12 for water shortage alarm, and a drain valve 13 is installed at the bottom for draining the residual liquid in the tank. A delivery pump 10 and a seawater flow meter 11 are also arranged on the wall of the brine tank 12. One end of the delivery pump 10 is connected to the brine tank 12 through the flow meter 11, and the other end is connected to the generating box. The delivery pump 10 controls the flow of seawater entering the generating box through the closed-loop measurement value of the liquid level meter 9 installed in the generating box, thereby realizing stable control of the liquid level height in the generating box. The delivery pump 10 has a forward and reverse delivery function, which can replenish the liquid in the generating box, and can also drain the liquid after pumping liquid from the generating box to the brine tank.

[0035] The micro-particle and trace salt mist generating device of the embodiment of the present invention can obtain the real-time mist generation amount of the salt mist generating device through the numerical ratio of the gas flow meter 2 and the artificial seawater flow meter 11. The salt mist generated by the micro-particle and trace salt mist generating device is transported to the test area, and after being diluted by the atmosphere of the test area's own spatial environment, the environmental simulation of the atmospheric micro-salt mist content can be realized.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A micro-particle salt mist generating device, characterized in that: It comprises a generating box with a salt mist outlet at the top and an air injector placed in the generating box, wherein the air injector is placed below the artificial seawater level of the generating box, a plurality of the air injectors are connected in series to form an air injection unit, and the on-off of the process gas of the air injection unit is controlled by an electromagnetic switch valve; A plurality of air injection units are installed in parallel in the generating box; after high-pressure process air enters the air injector, it is ejected from the annularly distributed multi-holes after passing through the internal airflow acceleration channel, and the ejected high-speed airflow stirs and breaks the liquid surface to form salt mist generation, and the generated salt mist particles flow out from the top outlet of the generating box along with the airflow, and are transported to the test area, and after being diluted by the atmosphere of the test area space environment, the environmental simulation of atmospheric micro-salt mist content can be achieved; an atomized particle screener is installed on the top of the salt mist outlet of the generating box, including a conical part at the bottom and a discharge part at the upper part, the discharge part is composed of two ring bodies separated from each other and connected together by a plurality of spaced-apart columns arranged in an annular manner, a salt mist inlet is formed between the two ring bodies and the columns, and a salt mist discharge outlet is formed inside the ring body, which is used for secondary screening of the salt mist particles moving with the airflow, so that particles with smaller particle sizes can better follow the airflow around.

2. The micro-particle salt mist generating device according to claim 1, characterized in that: The main body of the air injector is a cylinder, and a coaxial process gas inlet blind hole is formed at the bottom of the interface at the axial center. Gas ejection holes are arranged in a ring on the outer surface of the cylinder. The gas ejection holes extend into the interior of the cylinder and communicate with the middle of the process gas inlet blind hole, and the central axis is perpendicular to the central axis of the cylinder.

3. The micro-particle salt mist generating device according to claim 2, characterized in that: An air hole corresponding to the gas ejection hole is formed on the side wall of the process gas inlet blind hole, and the air hole is connected to the inner end of the gas ejection hole through an internal airflow acceleration channel formed by a reduced diameter hole portion, a same diameter connecting hole portion, and an expanded diameter hole portion in sequence. The diameter of the gas ejection hole is the same as the diameter of the wide mouth side of the expanded diameter hole portion.

4. The micro-particle salt mist generating device according to claim 1, characterized in that: The generating box is connected to a brine tank for storing artificial seawater required for salt fog generation through a delivery pump. The delivery pump is used to replenish liquid into the generating box and to draw liquid from the generating box to the brine tank for drainage.

5. The micro-particle salt mist generating device according to claim 4, characterized in that: The brine tank is provided with a low liquid level alarm switch for alarming water shortage, and a drain valve is provided at the bottom for draining the residual liquid in the tank.

6. The micro-particle salt mist generating device according to claim 5, characterized in that: A liquid level meter is installed in the generating box, and the delivery pump controls the flow of seawater entering the generating box in a closed loop through the measured value of the liquid level meter, thereby achieving stable control of the liquid level height in the generating box.

7. The micro-particle salt mist generating device according to claim 6, characterized in that: A seawater flowmeter is installed on the liquid replenishment pipeline between the delivery pump and the salt water tank, and a gas flowmeter is installed on the gas line supplying high-pressure process gas. The real-time mist generation amount of the salt mist generating device is obtained by comparing the values ​​of the gas flowmeter and the artificial seawater flowmeter.

8. The trace particle salt mist generating device according to claim 7, characterized in that: The gas path of the high-pressure process gas is also provided with a heater, a temperature sensor for controlling the heater arranged on the downstream side of the heater, a pressure regulating valve arranged on the downstream side of the gas flow meter, a pressure sensor for controlling the pressure regulating valve arranged between the pressure regulating valve and the heater, and a fine filter arranged on the upstream side of the gas flow meter; the temperature sensor is arranged upstream of the electromagnetic switch valve.

9. The micro-particle salt mist generating device according to claim 1, characterized in that: It also includes a brine tank, an equipment box, a control box and a touch screen. The equipment box is used for cleaning high-pressure air and regulating temperature and pressure. The equipment box contains a fine filter, a pressure regulating valve, a heater, an electromagnetic switch valve, a gas flow meter, a temperature sensor, and a pressure sensor; the control box is used to install a controller for a trace particle salt mist generating device to achieve full automatic control and working status monitoring of the trace particle salt mist generating device, and the touch screen is used for upper computer display and control, which is convenient for user operation; the brine tank, the generating box, and the equipment box are fixedly installed on the overall bottom plate, and the brine tank and the equipment box are respectively placed on both sides of the generating box to prevent the equipment in the equipment box from being corroded by the artificial seawater in the brine tank; the control box and the touch screen are placed above the equipment box to facilitate control wiring and user operation.

Images