A salt spray atmosphere particle size detection device, a salt spray atmosphere particle size detection method and application

Abstract

The present invention provides a salt fog atmosphere particle size detection device, a salt fog atmosphere particle size detection method using the detection device and its application, the detection device comprises a salt fog holding box, a salt fog generator, an outlet connecting pipeline of the salt fog holding box, a fan is arranged on the pipeline, and a gauze for depositing salt fog is installed on the outlet side of the pipeline; the detection method steps include: in the case of no filter membrane installed, the generated salt fog is quantitatively passed through the detection device, and the salt fog deposition rate A at the outlet of the detection device is measured; a filter membrane with a specific aperture is arranged at the outlet of the detection device, and the salt fog deposition rate B after passing through the detection device and its filter membrane is measured again; A and B are compared and a conclusion is given. The present invention can not only accurately realize the salt fog atmosphere particle size detection at an extremely low facility cost, but also can quantitatively characterize the degree of proximity between the salt fog generated by the test equipment and the salt fog in nature; the detection device provided by the present invention can be used as a detection device, and can also be used as an accessory component of the salt fog test equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of salt spray test, and in particular to a salt spray atmosphere particle size detection device, a salt spray atmosphere particle size detection method using the salt spray atmosphere particle size detection device, and an application thereof. Background Art

[0002] Salt spray test is an environmental test that mainly uses salt spray test equipment (or salt spray generator) to create artificial simulated salt spray environment conditions to evaluate the corrosion resistance of products or metal materials.

[0003] Existing salt spray test equipment includes: conventional salt spray test chamber, high-acceleration salt spray test chamber disclosed in document CN2014100933865, composite salt spray test chamber disclosed in document CN202994630U, and multifunctional salt spray test chamber disclosed in document CN202041450U. Existing salt spray test chambers are mainly based on tiny droplets generated by salt solution and floating in the air. Since the salt spray is generated by the equipment, this simulated salt spray is always significantly different from the real salt spray in the atmosphere. Therefore, how to simulate the salt spray in nature more realistically has become a research hotspot in this field.

[0004] Studies have shown that most of the salt spray particle sizes in nature are within 10 microns. At present, although the developed wet and hot salt spray atmosphere comprehensive test equipment (document CN113916755A) and salt spray corrosion test chamber (document CN207198014U) can better simulate the natural salt spray environment. However, there is still no low-cost detection method that can quantitatively characterize the degree of closeness between the salt spray produced and the salt spray in nature, and some related precision detection instruments cost tens of thousands of yuan. More importantly, the salt spray particle sizes produced by different salt spray test equipment are always different. How to convert the salt spray produced by them into the salt spray closest to the salt spray in nature is a major technical problem in this field. Summary of the invention

[0005] In view of the problems existing in the background technology, the present invention aims to provide a salt fog atmosphere particle size detection device, a salt fog atmosphere particle size detection method using the salt fog atmosphere particle size detection device and an application thereof.

[0006] To achieve the aforementioned objectives, the present invention adopts the following technical solutions.

[0007] A salt spray atmosphere particle size detection device is characterized in that it comprises a salt spray containing box, the inlet of the salt spray containing box is connected to a salt spray generator, the outlet of the salt spray containing box is connected to a pipeline, a fan is arranged on the pipeline, a filter membrane can be installed at the outlet end of the pipeline, and gauze for depositing salt spray is installed on the outlet side of the pipeline.

[0008] As a preferred solution to improve the detection efficiency, a parallel pipeline is provided on the pipeline of the detection device, each branch pipeline of the parallel pipeline is provided with a valve, and the lengths of any two branch pipelines of the parallel pipeline differ by N standard lengths; or, a plurality of inlet pipe sections are provided in the salt spray holding box, each inlet pipe section differs by N standard lengths, and a valve is provided on each inlet pipe section.

[0009] As another preferred solution to improve the detection efficiency, a pipe joint is provided on the pipeline of the detection device, and M standard pipe sections can be continuously installed at the pipe joint.

[0010] A method for detecting particle size in a salt spray atmosphere using the above-mentioned detection device, characterized in that the steps include:

[0011] Step 1, when no filter membrane is installed, the generated salt mist is quantitatively passed through a detection device, and the salt mist deposition rate A at the outlet of the detection device is measured;

[0012] Step 2, setting a filter membrane with a specific pore size (such as 10 microns) at the outlet of the detection device, and measuring the salt spray deposition rate B after passing through the detection device and its filter membrane again;

[0013] Step 3, compare the salt spray deposition rate A with the salt spray deposition rate B. If the difference between the two is not greater than the allowable difference (the allowable difference is preferably controlled within 6%, and the allowable difference ratio = 100% * (salt spray deposition rate A-salt spray deposition rate B) / salt spray deposition rate A), it is considered that the salt spray particle size at the outlet end of the pipeline in step 1 is not greater than the filter membrane pore size;

[0014] Step 4: If the difference between the salt spray deposition rate A and the salt spray deposition rate B is greater than the allowable difference, the wind speed of the fan is adjusted according to the preset value, or the length of the pipeline is lengthened, and steps 1 to 3 are repeated several times.

[0015] To further improve the accuracy of the detection method / results of the present invention, step 1 specifically includes:

[0016] Step 11, when the filter membrane is not installed, turning on the salt spray generator to generate salt spray;

[0017] Step 12, passing the generated salt mist into the salt mist holding box, turning on the fan on the pipeline, adjusting the wind speed V, and blowing the salt mist toward the gauze on the pipeline outlet side;

[0018] Step 13: After the preset time T1 of step 12 is implemented, the salt spray generator is turned off; after the fan works for the preset time T1+t1, the fan is turned off, and the salt spray deposition rate A1 on the gauze is measured; preferably, 1 hour ≥ t1 ≥ 0.2 hours;

[0019] Step 14, repeat steps 11 to 13 several times to determine the salt spray deposition rate A on the gauzen ;

[0020] Step 15, compare the salt spray deposition rate A1 with the salt spray deposition rate A n , if the salt spray deposition rate A1 and the salt spray deposition rate A n If the difference is within 5%, then A n As the salt spray deposition rate A.

[0021] To further improve the accuracy of the detection method / results of the present invention, step 2 specifically includes:

[0022] Step 21, installing a filter membrane at the outlet end of the pipeline;

[0023] Step 22, passing the generated salt mist into the salt mist holding box, turning on the fan on the pipeline, adjusting the wind speed V, and blowing the salt mist toward the gauze on the pipeline outlet side;

[0024] Step 23, after step 22 is implemented for a preset time T1, the salt spray generator is turned off;

[0025] Step 24, after the fan has worked for a predetermined time T1+t21, the fan is turned off; preferably, 1 hour ≥ t1 ≥ 0.2 hours;

[0026] Step 25, measuring the salt spray deposition rate B1 on the gauze;

[0027] Step 26, repeating steps 21 to 23 for multiple times, and turning off the fan after the fan works for a predetermined time T1+t31, and then measuring the salt spray deposition rate B on the gauze n ; Preferably, 1 hour ≥ t1 ≥ 0.2 hours;

[0028] Step 27, compare the salt spray deposition rate B1 with the salt spray deposition rate B n , if the salt spray deposition rate B1 and the salt spray deposition rate B n If the difference is within 5%, then B n As the salt spray deposition rate B.

[0029] In order to further improve the particle size detection efficiency of the salt spray atmosphere of the present invention, the detection device also includes a control system, which is respectively connected to and controls the operation of the salt spray generator, the valve, and the fan. The computer device of the control system includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented:

[0030] Step A, when the filter membrane is not installed, controlling the salt spray generator to turn on so as to generate salt spray;

[0031] Step B, controlling the fan on the reference branch pipeline W of the detection device to turn on, adjusting the wind speed V, and blowing the quantitatively generated salt mist toward the gauze on the pipeline outlet side;

[0032] Step C: After step B is implemented for a preset time T1, the salt spray generator is controlled to be turned off; the fan works for a preset time T 1+ After t1, the fan is controlled to be turned off;

[0033] Step D, repeating steps A to D multiple times until the operator can accurately measure the salt spray deposition rate A;

[0034] Step E, controlling the salt spray generator to turn on again to generate salt spray;

[0035] Step F, controlling the fan on the reference branch pipeline W of the detection device with the filter membrane to turn on, adjusting the wind speed V, and blowing the quantitatively generated salt mist toward the gauze at the outlet side of the pipeline;

[0036] After the preset time T1 of step G and step F is implemented, the salt spray generator is controlled to be turned off; after the fan works for a preset time T1+t2, the fan is turned off;

[0037] Step H, repeating steps E to G multiple times until the operator can accurately measure the salt spray deposition rate B;

[0038] Step I, reading the salt spray deposition rate A and the salt spray deposition rate B input by the operator, and calculating the required pipeline length L according to formula (I);

[0039] L=(AB) / K+L W …………………………(Ⅰ)

[0040] Where A is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L is the required pipeline length, K is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L ... W Indicates the length of the reference branch pipe W;

[0041] Step J, matching the corresponding branch pipe according to the required pipeline length L, controlling the valve on the branch pipe to open, and executing steps E to H until the difference between the salt spray deposition rate A and the salt spray deposition rate B is not greater than the allowable difference.

[0042] An application of the above-mentioned salt fog atmosphere particle size detection method on a salt fog particle size control device is to use the detection device in conjunction with a salt fog generator or a salt fog particle size control device so as to convert the generated salt fog into a salt fog that is closest to the salt fog in nature.

[0043] Beneficial effects: The present invention can not only accurately realize the detection of salt spray atmosphere particle size at an extremely low facility cost, the detection facility cost of which is only about 20% of the detection cost of existing precision instruments, but also can quantitatively characterize the degree of proximity between the salt spray generated by the test equipment and the salt spray in nature; the salt spray atmosphere particle size detection device provided by the present invention can be used not only as a detection device, but also as an auxiliary component of the salt spray test equipment, which is convenient for converting the generated salt spray into the salt spray that is closest to the salt spray in nature, and ingeniously integrates the detection and control of the salt spray particle size. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of the salt spray atmosphere particle size detection device (side view) of Example 1;

[0045] Figure 2 Schematic diagram of the particle size detection device for salt spray atmosphere (top view) of Example 2;

[0046] Figure 3 This is a partial schematic diagram of the inside (lateral) of the salt spray containing box of the salt spray atmosphere particle size detection device of Example 3;

[0047] Figure 4 Schematic diagram of the salt mist flow phenomenon in the last section of the pipeline in the embodiment. DETAILED DESCRIPTION

[0048] The technical solution of the present invention is further described below in conjunction with the accompanying drawings (schematic diagrams).

[0049] Example 1

[0050] A salt spray atmosphere particle size detection device, such as Figure 1 As shown, it includes a salt spray containing box 1, the inlet 6 of the salt spray containing box 1 is connected to the salt spray generator, the outlet of the salt spray containing box 1 is connected to the pipeline 3, the pipeline 3 is provided with a fan 2, the outlet end of the pipeline 3 can be installed with a filter membrane 4, the pipeline 3 section on the side of the filter membrane 4 is arranged horizontally, and its pore size is 10μm, and the outlet side of the pipeline 3 is installed with a gauze 5 for depositing salt spray. Among them, a pipe joint 7 is provided on the pipeline 3, and M (M is an integer multiple of 1) standard pipe joints can be continuously installed at the pipe joint 7, that is, one standard pipe joint can be added at the pipe joint 7, or multiple standard pipe joints can be added.

[0051] The salt spray atmosphere particle size detection method implemented by the salt spray atmosphere particle size detection device in this embodiment has the following steps:

[0052] Step 1, when no filter membrane is installed, the generated salt mist is quantitatively passed through a detection device, and the salt mist deposition rate A at the outlet of the detection device is measured;

[0053] More specifically:

[0054] Step 11, when the filter membrane 4 is not installed, turning on the salt spray generator to generate salt spray;

[0055] Step 12, passing the generated salt mist into the salt mist holding box 1, turning on the fan 2 on the pipeline, adjusting the wind speed V, and blowing the salt mist toward the gauze on the pipeline outlet side;

[0056] Step 13: After step 12 is implemented for a preset time T1 (0.5 hour), the salt spray generator is turned off; after the fan works for a preset time T1+t1 (1 hour), the fan is turned off, and the salt spray deposition rate A1 on the gauze is measured;

[0057] Step 14, repeat steps 11 to 13 for the second time, until the fan works for the preset time T1+t2 (1.5 hours), then turn off the fan and measure the salt spray deposition rate A on the gauze. n (At this time, A n Equivalent to A2);

[0058] Step 15, compare the salt spray deposition rate A1 with the salt spray deposition rate A n , if the salt spray deposition rate A1 and the salt spray deposition rate A n If the difference is within 5%, the last measured salt spray deposition rate A n As the salt spray deposition rate A;

[0059] If the salt spray deposition rate A1 and the salt spray deposition rate A n If the difference is more than 5%, continue to repeat steps 11 to 13, and extend the fan working preset time T1+t2+0.5n (T1+t2=1.5 hours, n is an integer multiple of 1) hours, turn off the fan, and measure the salt spray deposition rate A on the gauze. n Until the salt spray deposition rate A1 and the salt spray deposition rate A n The end is when the difference is within 5%;

[0060] Step 2, setting a filter membrane with a specific pore size at the outlet of the detection device, and measuring the salt spray deposition rate B after passing through the detection device and its filter membrane again;

[0061] More specifically:

[0062] Step 21, installing the filter membrane 4 at the outlet end of the pipeline 3;

[0063] Step 22, the generated salt mist is passed into the salt mist holding box 1, the blower 2 on the pipeline 3 is turned on, the wind speed V is adjusted (the wind speed is exactly the same as the wind speed in step 12), and the salt mist is blown toward the gauze 5 on the pipeline outlet side;

[0064] Step 23, after step 22 is implemented for a preset time T1 (0.5 hour), the salt spray generator is turned off;

[0065] Step 24, after the fan works for a predetermined time T1+t21 (2 hours), the fan is turned off;

[0066] Step 25, measuring the salt spray deposition rate B1 on the gauze;

[0067] Step 26, repeat steps 21 to 23 once, and turn off the fan after the fan works for a predetermined time T1+t31 (3 hours), and then measure the salt spray deposition rate B on the gauze. n ;

[0068] Step 27, compare the salt spray deposition rate B1 with the salt spray deposition rate B n , if the salt spray deposition rate B1 and the salt spray deposition rate B n If the difference is within 5%, then B n As the salt spray deposition rate B;

[0069] If the salt spray deposition rate B1 and the salt spray deposition rate B n If the difference is more than 5%, continue to repeat steps 21 to 23, and extend the fan working preset time T1+t31+n (T1+t31=3 hours, n is an integer multiple of 1) hours, turn off the fan, and then measure the salt spray deposition rate B on the gauze. n Until the salt spray deposition rate B1 and the salt spray deposition rate B n The end is when the difference is within 5%;

[0070] Step 3, comparing the salt spray deposition rate A with the salt spray deposition rate B. If the difference between the two is not greater than the allowable difference, it is considered that the salt spray particle size at the outlet end of the pipeline 3 in step 1 is not greater than the pore size of the filter membrane 4;

[0071] Step 4, if the difference between the salt spray deposition rate A and the salt spray deposition rate B is greater than the allowable difference, the wind speed of the fan is adjusted according to the preset value, or the length of the pipeline 3 is lengthened, and then steps 1 to 3 are repeated several times. In this step, when the length of the pipeline 3 is lengthened, a suitable number of standard pipe sections are added at the pipe joint 7; the wind speed of the fan is adjusted according to the preset value, usually by reducing the wind speed without changing the length of the pipeline.

[0072] Example 2

[0073] A salt spray atmosphere particle size detection device, such as Figure 2 As shown, it includes a salt spray holding box 1, the inlet 6 of the salt spray holding box 1 is connected to the salt spray generator, the outlet of the salt spray holding box 1 is connected to the pipeline 3, the pipeline 3 is provided with a fan 2, the outlet end of the pipeline 3 can be installed with a filter membrane 4, the pipeline 3 section on the side of the filter membrane 4 is arranged horizontally, and the outlet side of the pipeline 3 is installed with a gauze 5 for depositing salt spray. Among them, the pipeline 3 is provided with a parallel pipeline, and the parallel pipeline has a plurality of branch pipelines (including but not limited to Figure 2As shown in the figure, branch line 1 14, branch line 2 15, branch line 3 16), each branch line of the parallel pipeline is provided with a valve (control valve 1 11 is provided on branch line 1 14, control valve 2 12 is provided on branch line 2 15, and control valve 3 13 is provided on branch line 3 16), the length of any two branch lines of the parallel pipeline differs by N standard lengths (N ≥ 1 and is an integer multiple of 1), branch line 1 14 differs from branch line 2 15 by 1 standard length, branch line 1 14 differs from branch line 3 16 by 2 standard lengths, branch line 2 15 differs from branch line 3 16 by 2 standard lengths, and fan 2 is provided on both the inlet and outlet sides of the parallel pipeline. The detection device in this embodiment also includes a control system, which is respectively connected to and controls the operation of the salt spray generator, valve, and fan, and the computer equipment of the control system includes a memory, a processor, and a program stored in the memory and can be run on the processor, and the processor implements the following steps when executing the program:

[0074] Step A, when the filter membrane 4 is not installed, controlling the salt spray generator to open so as to generate salt spray;

[0075] Step B, control the valve 12 on the reference branch pipeline W (reference numeral 15) of the detection device to open, and at the same time turn on the fan 2, adjust the wind speed V, and blow the quantitatively generated salt mist to the gauze 5 on the outlet side of the pipeline;

[0076] Step C: After step B is implemented for a preset time T1 (0.5 hours), the salt spray generator is controlled to be turned off; the fan 2 works for a preset time T 1+ After t1 (1 hour), the fan 2 is controlled to be turned off, and the salt spray deposition rate A1 on the gauze is measured;

[0077] Step D, repeating steps A to C for multiple times until the operator can accurately measure the salt spray deposition rate A (refer to steps 14 to 15 in Example 1 for the process), and then controlling the valve 12 to close;

[0078] Step E, controlling the salt spray generator to turn on again to generate salt spray;

[0079] Step F, control the valve 12 on the reference branch pipeline W (reference numeral 15) of the detection device with the filter membrane 4 (before the salt spray generator is controlled to be opened again, the filter membrane 4 is installed by the operator) to open, and at the same time, turn on the blower 2, adjust the wind speed V, and blow the quantitatively generated salt spray to the gauze 5 on the outlet side of the pipeline 3;

[0080] After step G and step F are implemented for a preset time T1 (the salt spray generator works for 0.5 hours), the salt spray generator is controlled to be turned off; after the fan works for a preset time T1+t21 (2 hours), the fan 2 is turned off;

[0081] Step H, repeating steps E to G one or more times (the process refers to steps 26 to 27 in Example 1) until the operator can accurately measure the salt spray deposition rate B;

[0082] Step I, reading the salt spray deposition rate A and the salt spray deposition rate B input by the operator, and calculating the required pipeline length L according to formula (I);

[0083] L=(AB) / K+L W …………………………(Ⅰ)

[0084] Where A is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L is the required pipeline length, K is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L ... W Indicates the length of the reference branch pipe W;

[0085] Step J, matching the corresponding branch pipe according to the required pipeline length L, controlling the valve on the branch pipe to open, and executing steps E to H until the difference between the salt spray deposition rate A and the salt spray deposition rate B is not greater than the allowable difference.

[0086] In the present embodiment, after the pipeline specification is selected, it is necessary to pre-calculate by those skilled in the art the salt spray deposition rate in the standard length pipe section under the condition of constant wind speed (same as the wind speed in step F, using the rated wind speed of the standard salt spray test box) and no filter membrane, and the measuring method is as follows: keeping other parameters inconvenient, laying gauze on the inner wall of a detachable standard length pipe section, the gauze completely covers the inner wall of the pipe section, and within a unit time, the salt spray deposition rate deposited on the inner wall of the standard length pipe section is measured; laying gauze on the inner walls of two detachable standard length pipe sections, the gauze completely covers the inner wall of the pipe section, and within a unit time, the salt spray deposition rate deposited on the inner walls of the two standard length pipe sections is measured; laying gauze on the inner walls of three detachable standard length pipe sections, the gauze completely covers the inner wall of the pipe section, and within a unit time, the salt spray deposition rate deposited on the inner walls of the three standard length pipe sections is measured; and finally calculating the average inner salt spray deposition rate K of a standard length pipe section.

[0087] by Figure 2For example, if the length of the reference branch pipeline W is 1.5 meters, the average internal salt spray deposition rate K of a standard length (0.4 meter) pipe section of a certain diameter is measured to be 0.4. After step A-step I, if the value of the salt spray deposition rate A is 10 and the value of the salt spray deposition rate A is 8, the required pipeline length L = (10-8) / 0.4 + 1.5 = 2 meters can be calculated according to formula (I). Here, 5 standard length (0.4 meter) pipe sections need to be added to ensure that the difference between the salt spray deposition rate A and the salt spray deposition rate B is the same, and at least 4 standard length (0.4 meter) pipe sections need to be added to ensure that the difference between the salt spray deposition rate A and the salt spray deposition rate B is not greater than 6%.

[0088] Example 3

[0089] A salt spray atmosphere particle size detection device, such as Figure 3 As shown, it includes a salt spray holding box 1, the inlet 6 of the salt spray holding box 1 is connected to the salt spray generator, the outlet of the salt spray holding box 1 is connected to the pipeline 3, the fan 2 is arranged on the pipeline 3, the outlet end of the pipeline 3 can be installed with a filter membrane 4, the pipeline 3 section on the side of the filter membrane 4 is arranged horizontally, and the gauze 5 for depositing salt spray is installed on the outlet side of the pipeline 3. Among them, a plurality of inlet pipe sections (including but not limited to inlet pipe section 1 21 and the control valve at its lower end, inlet pipe section 2 22 and the control valve at its lower end, inlet pipe section 3 23 and the control valve at its lower end, inlet pipe section 4 24 and the control valve at its lower end...) are arranged in the salt spray holding box 1, and each inlet pipe section differs by N standard lengths (N≥1 and is an integer multiple of 1), and the inlet pipe section 1 21, the inlet pipe section 2 22, the inlet pipe section 3 23, and the inlet pipe section 4 24 differ by 1 standard length in sequence. The detection device in this embodiment also includes a control system, which is respectively connected to and controls the operation of the salt spray generator, the valve, and the fan. The computer device of the control system includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented:

[0090] Step A, when the filter membrane 4 is not installed, controlling the salt spray generator to open so as to generate salt spray;

[0091] Step B, controlling the valve on the reference branch pipeline (reference numeral 22) of the detection device to open, and at the same time turning on the fan 2, adjusting the wind speed V, and blowing the quantitatively generated salt mist toward the gauze 5 on the outlet side of the pipeline;

[0092] Step C: After step B is implemented for a preset time T1 (0.5 hours), the salt spray generator is controlled to be turned off; the fan 2 works for a preset time T 1+ After t1 (1 hour), the fan 2 is controlled to be turned off, and the salt spray deposition rate A1 on the gauze is measured;

[0093] Step D, repeating steps A to C for multiple times until the operator can accurately measure the salt spray deposition rate A (refer to steps 14 to 15 in Example 1 for the process), and after completion, the valve on the control reference branch line (reference numeral 22) is closed;

[0094] Step E, controlling the salt spray generator to turn on again to generate salt spray;

[0095] Step F, control the valve on the reference branch pipeline (reference numeral 22) of the detection device with the filter membrane 4 (before the salt spray generator is controlled to be opened again, the filter membrane 4 is installed by the operator) to open, and at the same time, turn on the blower 2, adjust the wind speed V, and blow the quantitatively generated salt spray to the gauze 5 on the outlet side of the pipeline 3;

[0096] After step G and step F are implemented for a preset time T1 (the salt spray generator works for 0.5 hours), the salt spray generator is controlled to be turned off; after the fan works for a preset time T1+t21 (2 hours), the fan 2 is turned off;

[0097] Step H, repeating steps E to G one or more times (the process refers to steps 26 to 27 in Example 1) until the operator can accurately measure the salt spray deposition rate B;

[0098] Step I, reading the salt spray deposition rate A and the salt spray deposition rate B input by the operator, and calculating the required pipeline length L according to formula (I);

[0099] L=(AB) / K+L W …………………………(Ⅰ)

[0100] Where A is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L is the required pipeline length, K is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L ... W Indicates the length of the reference branch pipe W;

[0101] Step J, matching the corresponding branch pipe according to the required pipeline length L, controlling the valve on the branch pipe to open, and executing steps E to H until the difference between the salt spray deposition rate A and the salt spray deposition rate B is not greater than the allowable difference.

[0102] The main difference between this embodiment and embodiment 2 is that a plurality of inlet pipe sections arranged side by side in the salt mist holding box 1 are used to replace the parallel pipelines in embodiment 2, and a valve is installed at the bottom end (inlet end) of each inlet pipe section to prevent the small amount of salt mist generated from gathering at the valve inlet and being wasted.

[0103] In the present invention, a new gauze 5 needs to be replaced after each measurement of the salt spray deposition rate. The specifications of the required pipeline 3 are determined by those skilled in the art according to the amount of salt spray, and generally refer to the diameter of the salt spray pipeline in a conventional salt spray test chamber.

[0104] Since most of the salt mist in the natural environment (air) has a particle size of less than 10 microns, this salt mist can float in the air for a long time and flow with the wind, while salt mist particles with larger particle sizes (such as particle sizes greater than 10 microns) will settle under their own gravity. Such salt mist particles with larger particle sizes will also show a parabolic motion trend under the action of directional horizontal wind. With the help of this phenomenon, the present invention cleverly lengthens the pipeline, allowing most of the salt mist particles with larger particle sizes to be deposited on the inner wall of the pipeline in the horizontal section of the pipeline (especially away from the fan and close to the pipeline outlet section), and will not affect the salt mist particles with a particle size of less than 10 microns blowing toward the gauze. The lengthened (within the appropriate length range, the initial measurement is 0.1-2.5 meters) pipeline section will not affect the deposition of salt mist particles within 10 microns. Based on this, it can be basically considered that the amount of salt mist deposited on the gauze is constant. This process can be assisted by Figure 4 For understanding, in the figure, the particle size of salt mist particle 41 is greater than the particle size of salt mist particle 42, and the particle size of salt mist particle 43 is greater than the particle size of salt mist particle 44. The particle size of salt mist particle 44 can pass through a filter membrane with a specification of 10 microns, which indicates that it is closest to / most similar to the salt mist in the natural environment (air).

[0105] In one embodiment, the salt mist atmosphere particle size detection method is applied to a salt mist particle size control device. The detection device is used in conjunction with a salt mist generator or a salt mist particle size control device to convert the generated salt mist into a salt mist that is closest to the salt mist in nature. That is, the detection device and the detection method are first used to determine the state closest to the natural salt mist. At this time, the required pipeline length, wind speed and other parameters can be determined, and then the filter membrane is removed, and the pipeline outlet is directly used as the final salt mist outlet to spray the salt mist.

[0106] The present invention can not only accurately realize the detection of salt fog atmosphere particle size at an extremely low facility cost, and the detection facility cost is only about 20% of the detection cost of existing precision instruments (the facility cost involved is mainly the material and production cost of pipelines, valves, fans, filter membranes, and salt fog containing boxes, which can be controlled at 2,500 yuan / set), but also can quantitatively characterize the degree of proximity between the salt fog generated by the test equipment and the salt fog in nature; the salt fog atmosphere particle size detection device provided by the present invention can be used not only as a detection device, but also as an auxiliary component of the salt fog test equipment, which is convenient for converting the generated salt fog into the salt fog that is closest to the salt fog in nature, and ingeniously integrates the detection and control of the salt fog particle size.

Claims

1. A salt spray atmosphere particle size control device, characterized in that: It comprises a salt spray containing box, the inlet of the salt spray containing box is connected to a salt spray generator, the outlet of the salt spray containing box is connected to a pipeline, a fan is arranged on the pipeline, a filter membrane can be installed at the outlet end of the pipeline, and gauze for depositing salt spray is installed on the outlet side of the pipeline; parallel pipelines are arranged on the pipeline of the control device, valves are arranged on each branch pipeline of the parallel pipeline, and the lengths of any two branch pipelines of the parallel pipeline differ by N standard lengths; or, a plurality of inlet pipe sections are arranged in the salt spray containing box, each inlet pipe section differs by N standard lengths, and a valve is arranged on each inlet pipe section.

2. The salt spray atmosphere particle size control device according to claim 1, characterized in that: A pipe joint is provided on the pipeline of the control device, and M standard pipe sections can be continuously installed at the pipe joint.

3. A method for controlling the particle size of a salt spray atmosphere using the control device according to any one of claims 1 to 2, characterized in that the steps include: Step 1, when no filter membrane is installed, the generated salt mist is quantitatively passed through the control device, and the salt mist deposition rate A at the outlet of the control device is measured; specifically comprising: Step 11, when the filter membrane is not installed, turning on the salt spray generator to generate salt spray; Step 12, passing the generated salt mist into the salt mist holding box, turning on the fan on the pipeline, adjusting the wind speed V, and blowing the salt mist toward the gauze on the pipeline outlet side; Step 13: After step 12 is implemented for a preset time T1, the salt spray generator is turned off; after the fan works for a preset time T1+t1, the fan is turned off, and the salt spray deposition rate A1 on the gauze is measured; Step 14, repeat steps 11 to 13 several times to determine the salt spray deposition rate A on the gauze n ; Step 15, compare the salt spray deposition rate A1 with the salt spray deposition rate A n , if the salt spray deposition rate A1 and the salt spray deposition rate A n If the difference is within 5%, the last measured salt spray deposition rate A n As the salt spray deposition rate A; Step 2, setting a filter membrane with a specific aperture at the outlet of the control device, and measuring the salt spray deposition rate B after passing through the control device and its filter membrane again; specifically comprising: Step 21, installing a filter membrane at the outlet end of the pipeline; Step 22, passing the generated salt mist into the salt mist holding box, turning on the fan on the pipeline, adjusting the wind speed V, and blowing the salt mist toward the gauze on the pipeline outlet side; Step 23, after step 22 is implemented for a preset time T1, the salt spray generator is turned off; Step 24, after the fan has worked for a predetermined time T1+t21, the fan is turned off; Step 25, measuring the salt spray deposition rate B1 on the gauze; Step 26, repeating steps 21 to 23 for multiple times, and turning off the fan after the fan works for a predetermined time T1+t31, and then measuring the salt spray deposition rate B on the gauze n ; Step 27, compare the salt spray deposition rate B1 with the salt spray deposition rate B n , if the salt spray deposition rate B1 and the salt spray deposition rate B n If the difference is within 5%, then B n As the salt spray deposition rate B; Step 3, comparing the salt spray deposition rate A with the salt spray deposition rate B. If the difference between the two is not greater than the allowable difference, it is considered that the salt spray particle size at the outlet of the pipeline in step 1 is not greater than the pore size of the filter membrane; Step 4: If the difference between the salt spray deposition rate A and the salt spray deposition rate B is greater than the allowable difference, the wind speed of the fan is adjusted according to the preset value, or the length of the pipeline is lengthened, and steps 1 to 3 are repeated several times.

4. A method for controlling the particle size of a salt spray atmosphere using the control device as claimed in claim 2, characterized in that: The control device also includes a control system, which is respectively connected to and controls the operation of the salt spray generator, the valve, and the fan. The computer device of the control system includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: Step A, when the filter membrane is not installed, controlling the salt spray generator to turn on so as to generate salt spray; Step B, controlling the fan on the reference branch pipeline W of the control device to turn on, adjusting the wind speed V, and blowing the quantitatively generated salt mist toward the gauze on the outlet side of the pipeline; Step C: After step B is implemented for a preset time T1, the salt spray generator is controlled to be turned off; the fan works for a preset time T 1+ After t1, the fan is controlled to be turned off; Step D, repeating steps A to D multiple times until the operator can accurately measure the salt spray deposition rate A; Step E, controlling the salt spray generator to turn on again to generate salt spray; Step F, controlling the fan on the reference branch pipeline W of the control device with the filter membrane to turn on, adjusting the wind speed V, and blowing the quantitatively generated salt mist toward the gauze on the outlet side of the pipeline; After the preset time T1 of step G and step F is implemented, the salt spray generator is controlled to be turned off; after the fan works for a preset time T1+t2, the fan is turned off; Step H, repeating steps E to G multiple times until the operator can accurately measure the salt spray deposition rate B; Step I, reading the salt spray deposition rate A and the salt spray deposition rate B input by the operator, and calculating the required pipeline length L according to formula (I); L=(A-B) / K+L W ……………………… (Ⅰ) Where A is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L is the required pipeline length, K is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition in the standard length pipeline section under constant wind speed and without filter membrane, L is the salt spray deposition rate measured without filter membrane installed, B is the salt spray deposition rate measured with filter membrane installed, L ... W Indicates the length of the reference branch pipe W; Step J, matching the corresponding branch pipe according to the required pipeline length L, controlling the valve on the branch pipe to open, and executing steps E to H until the difference between the salt spray deposition rate A and the salt spray deposition rate B is not greater than the allowable difference.

5. Application of the salt spray atmosphere particle size control method as claimed in claim 4 on a salt spray particle size control device.

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