System and method for accurately regulating and controlling settling volume of salt spray test

Abstract

The invention discloses a salt spray test settling volume accurate regulation and control system and method, and mainly solves the problems of poor test repeatability and reliability caused by incapability of accurately controlling salt spray settling volume in a salt spray test process in the prior art. The device comprises an air compressor (1), a saturator (2), a salt water tank (5) and a salt spray test bin (9), wherein a double-node nozzle (8) is arranged in the salt spray test bin; the air compressor is connected with the saturator, and the other end of the saturator is connected with a pressure regulator (3); the pressure regulator is connected with one end of the double-node nozzle through a pressure gauge (4) and provides high-pressure saturated air for the double-node nozzle; the brine tank is connected with a peristaltic pump (6), and the other end of the peristaltic pump is connected with the other end of the double-node nozzle through a flow meter (7) to provide brine for the double-node nozzle; by accurately controlling the pressure of the high-pressure saturated gas and the flow of the salt water, accurate regulation and control of the settling volume of the sprayed salt mist are realized. According to the method, the salt spray resistance of the equipment in the salt spray environment can be better evaluated, the reproducibility is high, the reliability is high, and the method can be used for the salt spray test of large equipment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of equipment test, and particularly relates to a salt mist test deposition amount precision control system and method, which can be used for salt mist test of large equipment. BACKGROUND

[0002] The salt mist test is a test method for checking the adaptability of equipment in the marine atmospheric environment, and is directly related to the checking of the salt mist test ability of the equipment. The salt mist deposition rate can best reflect the salt mist characteristics. The salt solution formed by the salt mist deposition on the surface of the measured object in unit time is a core index of the salt mist test. If the salt mist deposition rate cannot be controlled, the salt mist test will lose its significance, and it may also cause misjudgment of the salt mist corrosion resistance of the equipment.

[0003] The national standard of the salt mist test generally requires that the deposition amount is 1.0-3.0 ml / (80 cm 2 ·h), which is relatively wide, and different deposition amounts have obvious different effects on the equipment. If the deposition amount of the salt mist is not precisely controlled during the test, the repeatability and reliability of the salt mist test are difficult to guarantee. The traditional salt mist test uses a siphon type atomizing device. The airflow at the nozzle port causes negative pressure or vacuum to siphon the salt water, so that it is sprayed into mist. Small fluctuations in air pressure will cause large changes in the amount of salt water suction. The deposition amount of the salt mist is difficult to precisely control, which can easily lead to under-test or over-test, poor test repeatability, and low reliability. Therefore, it is urgent to precisely control the deposition amount of the salt mist test.

[0004] The patent document with publication number CN 101551320 B discloses a "salt mist test box salt mist generating device", which includes a tower body, a tower cap, a gas nozzle, a gas pipeline, a liquid nozzle, a liquid pipeline, and a transmission device. The device adopts a classic tower arrangement. Although the salt mist test deposition is uniform, it can improve the accuracy and reproducibility of the salt mist test results. However, since the device uses a siphon type nozzle, it mainly relies on the negative pressure generated by the air jet to suck the salt water, and it is difficult to achieve precise control of the deposition. The repeatability of the test is difficult to guarantee.

[0005] The patent document with publication number CN 222855702 U discloses a "salt mist test box spray structure", which includes a box body, a fixing rod, a connecting pipe, a spray pipe, and a plurality of atomizing nozzles. The motor atomizing nozzles are fixedly connected to the bottom outer wall of the box body and can spray salt mist in multiple directions, so that the salt mist can fully contact the test product. The clamping assembly can stably clamp the test product by the sliding block. However, since the device only clearly uses the nozzle structure and principle, and does not clearly show the supply mode of the gas and liquid, it cannot achieve precise control of the salt mist deposition amount during the salt mist test. SUMMARY

[0006] The present application aims at the deficiencies of the prior art, and provides a salt mist test deposition amount precise control system and method, so as to precisely control the salt mist deposition amount in the experimental salt mist test process, improve the repeatability and reliability of the test, and better evaluate the salt mist resistance of equipment in a salt mist environment.

[0007] To achieve the above object, the technical scheme of the present application comprises:

[0008] 1. A salt mist test deposition amount precise control system, comprising an air compressor, a saturator, a salt water tank and a salt mist test chamber, wherein the air compressor is connected to one end of the saturator through a gas pipeline, and characterized in that:

[0009] The salt mist test chamber is internally provided with a double-node nozzle;

[0010] The other end of the saturator is connected with a pressure regulator through a gas pipeline, the upper end of the pressure regulator is provided with a pressure gauge, and the other end of the pressure regulator is connected with one end of the double-node nozzle through a gas pipeline to provide high-pressure saturated air for the double-node nozzle;

[0011] The salt water tank is connected with a peristaltic pump through a liquid pipeline, the other end of the peristaltic pump is provided with a flow meter, and the other end of the flow meter is connected with the other end of the double-node nozzle through a liquid pipeline to provide salt water for the double-node nozzle;

[0012] The pressure value of the high-pressure saturated gas and the flow value of the salt water are precisely controlled to realize precise control of the salt mist deposition amount.

[0013] As a preferred embodiment, the double-node nozzle comprises a base, an intermediate column, an atomizing nozzle and a compression bolt, the intermediate column is fixed on the base through threads, and the atomizing nozzle is connected to the other end of the intermediate column through the compression bolt.

[0014] As a preferred embodiment, the air compressor, the saturator, the pressure regulator, the pressure gauge and the gas pipeline constitute a gas supply device, the salt water tank, the peristaltic pump, the flow meter and the liquid pipeline constitute a liquid supply device, and the gas supply device and the liquid supply device are both installed outside the salt mist test chamber and connected with the double-node nozzle inside the salt mist test chamber.

[0015] As a preferred embodiment, the salt mist test chamber has a herringbone structure at the upper end and a cuboid structure at the lower end, and the double-node nozzle is installed at the middle position of the connection between the cuboid structure and the herringbone structure inside the salt mist test chamber.

[0016] 2. A method for precisely controlling the salt mist test deposition amount by using the above system, characterized in that the method comprises:

[0017] S1) controlling the pressure value of the high-pressure saturated gas and the flow value of the salt water;

[0018] The air compressor is opened to suck air to form high-pressure air, the high-pressure air passes through a saturator to form high-pressure saturated gas, and the pressure value of the high-pressure saturated gas is controlled in the range of [0.18-0.35] MPa through the adjustment of a pressure regulator and the real-time monitoring of a pressure gauge;

[0019] The peristaltic pump is opened to suck the salt water in the salt water tank, and the flow value of the sucked salt water is controlled in the range of [1.21-3.93] L / h through the real-time monitoring of a flow meter and the regulation of the peristaltic pump.

[0020] S2) The high-pressure saturated gas and the salt water controlled in parameters are transported to the double-node nozzle, and enter the mixing chamber through the saturated air connecting hole and the column passage of the double-node nozzle, respectively.

[0021] S3) The high-pressure saturated gas and the salt water are fully mixed in the mixing chamber, and the mixed gas-liquid mixture is sprayed out of the salt mist through the atomizing channel of the atomizing nozzle, and the deposition amount is controlled in the range of [1.0-3.0] ml / (80cm 2 ·h).

[0022] S4) The pressure regulator 3 and the peristaltic pump 6 are adjusted to accurately control the deposition amount, and a data table composed of the accurate values of the air pressure, the salt water flow and the corresponding deposition amount is recorded, so that the deposition amount of the salt mist test is accurately regulated through the data table.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] Firstly, the present application can accurately control the pressure of the high-pressure saturated air injected into the nozzle and the flow of the salt mist, and further accurately control the deposition amount of the salt mist test, because the pressure regulator and the pressure gauge are installed on the gas pipeline, and the peristaltic pump and the flow meter are installed on the liquid pipeline.

[0025] Secondly, the present application can realize temperature spraying in the low air pressure range and the high air pressure range, and improve the stability and reliability of the spraying of the whole large salt mist test chamber, because the peristaltic pump is installed to actively provide salt water for the nozzle.

[0026] Thirdly, the present application can realize the aerosol state, is conducive to the diffusion in a large space, and better simulates the real salt mist environment, so as to effectively ensure the uniformity of the space deposition of the whole large salt mist test chamber, because the double-node nozzle is adopted to realize very small salt mist particle size.

[0027] Fourthly, the present application can improve the reproducibility of the salt mist test, and is conducive to the evaluation and improvement of the salt mist test ability of equipment, because the saturated air, the salt water flow and the salt mist deposition amount are accurately controlled. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the deposition amount accurate regulation system of the present application.

[0029] Figure 2 The structure diagram of the liquid supply device in the system of the present application;

[0030] Figure 3 The structure diagram of the gas supply in the system of the present application;

[0031] Figure 4 The exploded view of the double-node spray head in the system of the present application;

[0032] Figure 5 The cross-sectional view of the double-node spray head in the system of the present application;

[0033] Figure 6 The spray effect simulation diagram of the double-node spray head in the system of the present application;

[0034] Figure 7 The process schematic diagram of the precise control of the deposition amount of the present application;

[0035] Figure 8 The relationship diagram of the air pressure and flow and the deposition amount of the present application. DETAILED DESCRIPTION

[0036] In order for those skilled in the art to better understand the present application, the technical solutions and effects in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0037] Example one, salt spray test deposition amount precise control system

[0038] The present application is implemented for the use scene of implementing the salt spray test of the large test box. The object of the salt spray test is the whole unmanned aerial vehicle. The salt spray test implementation space needs to reach 2m wide, 4m long, and 2m high. The salt spray test implementation is 24h spraying, 24h drying is a cycle, and multiple cycles are carried out according to the need. In order to ensure the repeatability and stability of the salt spray test, it is necessary to precisely control the deposition amount in the salt spray test process.

[0039] REFERENCE Figure 1The sedimentation amount precision control system of the present example comprises an air compressor 1, a saturator 2, a pressure regulator 3, a pressure gauge 4, a brine tank 5, a peristaltic pump 6, a flow meter 7, a double-node nozzle 8, a salt spray test chamber 9, and gas pipelines and liquid pipelines. The air compressor 1 is connected to one end of the saturator 2 through a gas pipeline, the other end of the saturator 2 is connected to one end of the pressure regulator 3 through a gas pipeline, the pressure gauge 4 is installed on the upper end of the pressure regulator 3, and the other end of the pressure regulator is connected to one end of the double-node nozzle 8 through a gas pipeline, for providing high-pressure saturated air for the double-node nozzle 8; the brine tank 5 is connected to the peristaltic pump 6 through a liquid pipeline, the flow meter 7 is installed on the peristaltic pump 6, and the other end of the peristaltic pump 6 is connected to the other end of the double-node nozzle 8 through a liquid pipeline, for providing brine for the double-node nozzle 8.

[0040] The salt spray test chamber 9 has a herringbone structure at the upper end and a cuboid structure at the lower end, the double-node nozzle 8 is installed inside the salt spray test chamber 9 and located at the middle position of the connection between the cuboid and the herringbone structure, and is connected to the external air supply device of the salt spray test chamber 9 through a gas pipeline and connected to the external liquid supply device of the salt spray test chamber 9 through a liquid pipeline. The high-pressure air injected into the double-node nozzle 8 is controlled by the pressure regulator 3 on the gas pipeline, and the pressure value of the high-pressure air is monitored in real time by the pressure gauge 4 installed on the pressure regulator 3, so as to adjust the pressure value of the high-pressure air; the brine injected into the double-node nozzle 8 is controlled by the peristaltic pump 6 on the liquid pipeline, and the flow of the brine is monitored in real time by the flow meter 7 installed on the peristaltic pump 6, so as to adjust the flow of the brine. The air pressure and the brine flow are adjusted to realize the precise control of the sedimentation amount of the salt spray test.

[0041] Referring to Figure 2 The air compressor 1, the saturator 2, the pressure regulator 3, the pressure gauge 4, and the gas pipeline constitute an air supply device, which is installed outside the salt spray test chamber 9.

[0042] Referring to Figure 3 The brine tank 5, the peristaltic pump 6, the flow meter 7, and the liquid pipeline constitute a liquid supply device, which is installed outside the salt spray test chamber 9.

[0043] Referring to Figure 4 The double-node nozzle 8 comprises a base 81, an intermediate column body 82, an atomizing nozzle 83, and a compression bolt 84. The base 81 is threadedly connected to the intermediate column body 82, and the atomizing nozzle 83 is connected to the other end of the intermediate column body 82 through the compression bolt 84.

[0044] Referring to Figure 5 The base 81, the intermediate column body 82, and the atomizing nozzle 83 of the double-node nozzle 8 have the following structures:

[0045] The intermediate column 82 is cylindrical, and symmetrically opens salt water connection holes 821 and saturated air connection holes 822 and column passages 823 on both sides of the column, the salt water connection holes 821 are connected with the liquid supply device through the liquid pipeline, and the saturated air connection holes 822 are connected with the air supply device through the gas pipeline;

[0046] The base 81 forms a salt water chamber 824 with the end of the salt water connection hole 821, and adjusts the size of the salt water chamber through the threads of the base and the intermediate column;

[0047] The atomizing nozzle 83 has an atomizing passage in the middle, and the atomizing nozzle forms a mixing chamber 825 with the intermediate column.

[0048] The gas pipeline and the liquid pipeline in the example are made of latex material to avoid corrosion of saturated air and salt water, and are cylindrical to facilitate the flow of gas and liquid, and the diameter is 10 mm.

[0049] The air compressor 1 in the example adopts but is not limited to a worm type air compressor, and has a gas storage function and a drying function. The worm type air compressor has simple structure and high reliability, the attached gas storage function can realize stable air supply, and the drying function can dry the air compressor to avoid corrosion of humid air. The air compressor 1 extracts air to form 0.4 MPa of dry high-pressure air.

[0050] The saturator 2 in the example adopts but is not limited to a cylindrical shape, and a heating pipe is installed inside to heat the stored deionized water. The high-pressure air formed by the air compressor enters the heated deionized water from the lower part of the saturator 2 through the gas pipeline, and forms high-pressure saturated gas.

[0051] The pressure regulator 3 in the example adopts but is not limited to a rotary pressure regulating device. The high-pressure saturated gas passes through the pressure gauge installed on the pressure regulator 3 to control the pressure value in real time, and adjusts the pressure value required according to the set salt mist deposition amount.

[0052] The salt water tank 5 in the example adopts but is not limited to a cylindrical shape, and a stirring device is installed thereon to realize uniform salt mist concentration through stirring. The peristaltic pump 6 is connected to the lower end of the salt water tank through the liquid pipeline, and the salt water is extracted through the latex tube which is continuously squeezed by the peristaltic pump, so as to avoid corrosion caused by contact between the salt water and the components of the peristaltic pump.

[0053] Example two, the method for accurately controlling the salt mist deposition amount in the salt mist test by using the above system in the salt mist test

[0054] Reference Figure 7 The implementation of the example includes the following:

[0055] Step 1, form high-pressure saturated gas and control the pressure value.

[0056] The air compressor 1 is opened, and the worm continuously moves to store high-pressure air in the air tank attached to the air compressor. At the same time, it continuously sucks external air and dries the sucked air through the attached desiccant to avoid humid air entering the air tank. After the air compressor extracts the air, 0.4 MPa of dry high-pressure air is formed into the heating pipe of the saturator 2, and the deionized water stored in the heating pipe forms high-pressure air, which then enters the heated deionized water from the lower part of the saturator 2 through the gas pipeline, forming high-pressure saturated gas;

[0057] The pressure regulator 3 is adjusted, and according to the real-time monitoring of the pressure gauge (4), the pressure value of the high-pressure saturated gas is controlled within the range of [0.18~0.35] MPa.

[0058] Step 2, suck salt water, control flow.

[0059] The peristaltic pump 6 is opened, and the rollers of the peristaltic pump squeeze the latex hose to generate negative pressure, continuously sucking salt water from the salt water tank 5 through the liquid pipeline. The flow of the salt water can be accurately controlled by adjusting the speed of the motor of the peristaltic pump, and the flow value is monitored in real time by the flowmeter (7), and the flow value of the sucked salt water is controlled within the range of [1.21~3.93] L / h;

[0060] The salt water is continuously pushed forward to realize salt mist delivery.

[0061] Step 3, gas and salt water transmission.

[0062] The high-pressure saturated gas with controlled pressure value is delivered to one end of the double-node nozzle 8 through the gas pipeline, and enters the mixing chamber 825 through the saturated air connection hole 822 of the double-node nozzle 8.

[0063] The salt water controlled by the flow is delivered to the other end of the double-node nozzle 8, and enters the mixing chamber 825 through the column passage 823 of the double-node nozzle 8.

[0064] Step 3, gas-liquid mixing.

[0065] The high-pressure saturated gas entering the mixing chamber 825 and the salt water are atomized into small particles and fully mixed by the sudden increase in space of the mixing chamber 825 and the high-speed gas flow. The high-speed flowing gas high-pressure saturated air will produce shear force and impact force on the liquid during the atomization process, so that the salt water is broken into small liquid particles. These small particles are sprayed out through the atomizing nozzle's atomizing passage 831 together with the high-pressure saturated air, forming salt mist;

[0066] The pressure value of the high-pressure saturated gas is controlled in the range of [0.18-0.35] MPa by adjusting the pressure regulator 3 and according to the real-time monitoring of the pressure gauge 4; the flow value of the salt water absorbed is controlled in the range of [1.21-3.93] L / h by real-time monitoring of the flow gauge 7, so that the salt mist deposition amount can be controlled in the range of [1.0-3.0] ml / (80cm 2 ·h).

[0067] Step 4, accurate control of the deposition amount.

[0068] 4.1) According to the real-time monitoring of the pressure gauge 4, the pressure value of the high-pressure saturated gas is controlled to be 0.24 MPa by adjusting the rotary pressure regulating device of the pressure regulator 3, and according to the real-time control of the flow gauge 7, the flow value of the salt water absorbed is controlled to be 2.86 L / h by adjusting the rotating speed of the motor of the peristaltic pump 6, so that the salt mist with small particle size can be sprayed, the aerosol state is realized, which is beneficial to the diffusion in a large space, better simulates the real salt mist environment, effectively ensures the uniformity of the deposition in the space of the whole salt mist test chamber, and the spraying effect of the double-node nozzle 8 can be obtained through simulation, as shown in Figure 6 .

[0069] 4.2) Record the air pressure, salt water flow and the corresponding deposition amount accurate value to form a data table, according to the required deposition amount, refer to the corresponding pressure value and flow value of the data table, and reset the corresponding pressure value and flow value in the test system, start the test, and the accurate control of the deposition amount can be realized.

[0070] The effects of the present application can be further illustrated by the following test experiments:

[0071] I. Test conditions

[0072] The space of the whole salt mist test chamber is set to be 4m long, 2m wide and 2m high, and is provided with one set of liquid supply device, one set of gas supply device and one set of double-node nozzle. In order to test the accurate control effect of the salt mist test deposition amount, the following five test conditions are set.

[0073] Condition 1: the air pressure is adjusted to be 0.18 MPa, and the salt water flow is 1.22 L / h,

[0074] Condition 2: the air pressure is adjusted to be 0.20 MPa, and the salt water flow is 2.15 L / h,

[0075] Condition 3: the air pressure is adjusted to be 0.24 MPa, and the salt water flow is 2.86 L / h,

[0076] Condition 4: the air pressure is adjusted to be 0.28 MPa, and the salt water flow is 3.54 L / h,

[0077] Condition 5: Adjust the air pressure to 0.35 MPa, and the salt water flow rate to 4.51 L / h.

[0078] II. Test content

[0079] Six deposition monitoring devices were arranged in the salt water test chamber, and each of the above five test conditions was tested by using the continuous spraying of the present application for 24 hours, respectively, to obtain the salt mist deposition rate and the uniformity of the salt mist deposition, wherein:

[0080] Under condition 1, the maximum salt mist deposition rate was 1.02 ml / (80cm 2 •h), the minimum value was 0.96 ml / (80cm 2 •h), and the average deposition was 1.00 ml / (80cm 2 •h).

[0081] Under condition 2, the maximum salt mist deposition rate was 1.52 ml / (80cm 2 •h), the minimum value was 1.46 ml / (80cm 2 •h), and the average deposition was 1.50 ml / (80cm 2 •h).

[0082] Under condition 3, the maximum salt mist deposition rate was 2.01 ml / (80cm 2 •h), the minimum value was 1.98 ml / (80cm 2 •h), and the average deposition was 2.00 ml / (80cm 2 •h).

[0083] Under condition 4, the maximum salt mist deposition rate was 2.51 ml / (80cm 2 •h), the minimum value was 2.47 ml / (80cm 2 •h), and the average deposition was 2.50 ml / (80cm 2 •h).

[0084] Under condition 5, the maximum salt mist deposition rate was 3.11 ml / (80cm 2 •h), the minimum value was 2.92 ml / (80cm 2 •h), and the average deposition was 3.00 ml / (80cm 2 •h).

[0085] The accurate values of the air pressure, the salt water flow rate and the deposition obtained in the test experiment were recorded to form a data table, as shown in Table 1.

[0086] Table 1, relationship between the air pressure value, the salt water value and the deposition accurate control

[0087]

[0088] From table 1, by adjusting air pressure, salt water flow can be precisely controlled.

[0089] According to the air pressure, salt water flow and corresponding sedimentation amount change trend drawn by table 1 values, the result is as Figure 8 .

[0090] By Figure 8 , in [1.0~3.0] ml / (80cm 2 ·h) range, any required sedimentation amount can be precisely controlled, specifically:

[0091] According to the test requirement, first determine the corresponding sedimentation amount;

[0092] Then according to the value of sedimentation amount find the value on the corresponding curve, at the same time get the corresponding pressure value and flow value;

[0093] In the test system, reset the corresponding pressure value and flow value, start the test, that is, the precise control of sedimentation amount can be realized.

[0094] Since Figure 8 The curve in [1.0~3.0] ml / (80cm 2 ·h) range is continuous, according to the figure, continuous and precise control of salt spray test sedimentation amount can be realized.

[0095] The test results show that the application can well solve the problem of precise control of salt spray test sedimentation amount, not only effectively guarantee the control of sedimentation amount in large salt spray test chamber, but also guarantee the uniformity and reliability of sedimentation amount.

[0096] The above description is only two specific examples of the application, and does not constitute any limitation on the application. Obviously, for those skilled in the art, after understanding the content and principle of the application, various modifications and changes in form and details can be made without departing from the principle and structure of the application, for example, the pressure gauge of the example can be installed at the upper end of the pressure regulator, or at the lower end, front end or rear end of the pressure regulator; the middle column can be designed as a circle, or as an ellipse or a square; the nozzle can be designed as a circular structure, or as an elliptical structure, a square structure or a rectangular structure; the salt water connection hole and the saturated air connection hole can be designed as a non-stacking structure. However, these modifications and changes based on the idea of the application are still within the protection scope of the claims of the application.

Claims

1. A precise control system for salt spray test sedimentation, comprising an air compressor (1), a saturator (2), a brine tank (5), and a salt spray test chamber (9), wherein the air compressor is connected to one end of the saturator via a gas pipeline, characterized in that: The salt spray test chamber (9) is equipped with a dual-node nozzle (8). The saturator (2) has a pressure regulator (3) connected to its other end via a gas pipeline. A pressure gauge (4) is installed on the upper end of the pressure regulator, and the other end is connected to one end of a dual-node nozzle (8) via a gas pipeline to provide it with high-pressure saturated air. The brine tank (5) is connected to a peristaltic pump (6) via a liquid pipe. A flow meter (7) is installed at the other end of the peristaltic pump. The other end of the flow meter is connected to the other end of a dual-node nozzle (8) via a liquid pipe to supply brine to it. By precisely controlling the pressure of the high-pressure saturated gas and the flow rate of the brine, the amount of salt spray settling can be accurately regulated.

2. The system according to claim 1, characterized in that: The dual-node nozzle (8) includes a base (81), a middle column (82), an atomizing nozzle (83), and a clamping bolt (84); the middle column (82) is fixed to the base (81) by threads, and the atomizing nozzle (83) is connected to the other end of the middle column (82) by the clamping bolt (84).

3. The system according to claim 1, characterized in that: The air compressor (1), saturator (2), pressure regulator (3), pressure gauge (4) and gas pipeline constitute an air supply device; the brine tank (5), peristaltic pump (6), flow meter (7) and liquid pipeline constitute a liquid supply device. Both the gas supply device and the liquid supply device are installed outside the salt spray test chamber (9).

4. The system according to any one of claims 1-3, characterized in that: The intermediate column (82) is cylindrical, and has a brine connection hole (821) and a saturated air connection hole (822) and a column channel (823) symmetrically opened on both sides of the column. The brine connection hole (821) is connected to the liquid supply device through a liquid pipe, and the saturated air connection hole (822) is connected to the gas supply device through a gas pipe. The base (81) forms a brine chamber (824) at its end with the brine connection hole (821), and the size of the brine chamber is adjusted by the thread between the base and the intermediate column; The atomizing nozzle (83) has an atomizing channel in the middle, and the atomizing nozzle and the middle column form a mixing chamber (825).

5. The system according to claim 1, characterized in that, The salt spray test chamber (9) has a herringbone structure at the top and a cuboid structure at the bottom. The dual-node nozzle (8) is installed in the middle of the connection between the cuboid and the herringbone structure inside the salt spray test chamber (9).

6. The system according to claim 1, characterized in that: The high-pressure air injected into the dual-node nozzle (8) is controlled by the pressure regulator (3) on the gas channel and monitored in real time by the pressure gauge (4) installed on the pressure regulator (3) to adjust the pressure value of the high-pressure air.

7. The system according to claim 1, characterized in that: The brine injected into the dual-node nozzle (8) is controlled by a peristaltic pump (6) on the liquid channel, and is monitored in real time by a flow meter (7) installed at one end of the peristaltic pump (6), which adjusts the brine accordingly. flow.

8. A method for precisely controlling the deposition rate in a salt spray test using the system described in claim 1, characterized in that, include: S1) Control the pressure value of the high-pressure saturated gas and the flow rate of the brine: Turn on the air compressor (1) to draw in air to form high-pressure air. The high-pressure air passes through the saturator (2) to form high-pressure saturated gas. By adjusting the pressure regulator (3) and according to the real-time monitoring of the pressure gauge (4), the pressure value of the high-pressure saturated gas is controlled within the range of [0.18~0.35] MPa. Turn on the peristaltic pump (6) to draw brine from the brine tank (5), and monitor the flow rate in real time through the flow meter (7) to regulate the peristaltic pump and control the flow rate of the brine drawn to be within the range of [1.21~3.93] L / h; S2) The high-pressure saturated gas and brine after parameter control are delivered to the dual-node nozzle (8) and enter the mixing chamber (825) through its saturated air connection hole (822) and column channel (823), respectively. S3) The mixing chamber (825) thoroughly mixes the high-pressure saturated gas with brine, and the mixed gas-liquid mixture is sprayed out as salt mist through the atomization channel (831) of the atomizing nozzle. The sedimentation rate is controlled at [1.0~3.0] ml / (80cm). 2 Within the range of ·h); S4) Adjust the pressure regulator 3 and peristaltic pump 6 to precisely control the sedimentation amount. Record the air pressure, salt flow rate and their corresponding precise sedimentation values ​​to form a data table. Through this data table, the sedimentation amount of the salt spray test can be precisely controlled.

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