Spraying system of salt mist generator
By using a pneumatic spray system and mesh assembly combined with hydrophobic coating technology in a salt spray generator, the ejection from conventional salt spray particles to large droplets is achieved, and the low ejection efficiency of large-particle salt droplets in the prior art is solved. The problem provides salt spray corrosion test conditions closer to the actual environment.
Patent Information
- Application Number
- CN202411229783.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2024-12-13
AI Technical Summary
Existing salt spray generator spray systems are difficult to accurately characterize the complex salt spray corrosion conditions of coastal or marine areas, especially the ejection and crushing efficiency of large-grained salt droplets, which cannot effectively simulate the actual environment.
Using a pneumatic jet system combined with mesh assembly and hydrophobic coating, the design of multi-channel tubes and communication tubes is used to achieve continuous crushing and multiple segmentation of salt spray droplets through the design of multi-channel tubes and communication tubes, and the cone tip and stainless steel filters are used to achieve continuous crushing and multiple segmentation of salt spray droplets, resulting in salt spray of different bandwidths. Particles and large particles drops.
The ejection from conventional salt spray particles to large droplets is achieved, and the particle size distribution is closer to the actual situation, which is conducive to the implementation of more accurate salt spray acceleration tests. The system structure is simple, the area is small and the efficiency is high.
Smart Images
Figure CN119114305A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of salt spray test equipment, and in particular relates to a salt spray generator spray system. Background Art
[0002] The traditional salt spray generator spray system includes air pressure injection system, spray tower system and ultrasonic atomization system. Among them, the ultrasonic atomization system sprays salt spray particles with smaller diameter and better uniformity, while the air pressure injection system and spray tower system spray salt spray particles with larger diameter and wider distribution band.
[0003] In addition to the conventional salt spray box specified in the industry standard in this field, the existing document CN216284850U discloses a trace particle salt spray generating device, including a generating box with a salt spray outlet on 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 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 the high-pressure process air enters the air injector, it passes through the internal airflow acceleration channel and is ejected by the annularly distributed multi-holes, the ejected high-speed airflow stirs and breaks the liquid surface to form salt spray, and the generated salt spray particles flow out from the top outlet of the generating box along with the airflow.
[0004] However, the existing salt spray generator spray systems can only spray salt spray with a single bandwidth (distribution range of salt spray particle diameter). For example, ultrasonic atomization systems usually spray salt spray particles with a particle size of about one micron, and pneumatic injection systems often spray salt spray particles with a particle size of less than tens of microns. In actual situations, the salt spray corrosion of some equipment used in coastal or marine areas is relatively complicated. In addition to being affected by conventional salt spray particles (with a particle size of less than tens of microns), they are often affected by large-particle salt droplets (droplets with a diameter of hundreds of microns and containing sodium chloride and water molecules). In this regard, if a traditional salt spray generator spray system is used, it is difficult to accurately characterize the salt spray corrosion of the sample. Therefore, it is necessary to develop a salt spray generator spray system that can provide both conventional salt spray particles and large-particle salt droplets.
[0005] More importantly, since salt solutions have very obvious molecular forces, conventional mechanical intervention (such as jet impact plates) can usually only break the salt solutions into relatively large droplets (such as millimeters in diameter). Breaking the salt solutions into large salt droplets with diameters of hundreds of microns and spraying them out smoothly has always been a difficult problem that has not yet been overcome in this field. Summary of the invention
[0006] At least in order to solve the technical problems mentioned in the background technology, the present invention aims to provide a salt spray generator spray system.
[0007] The present invention adopts the following technical solution.
[0008] A salt spray generator spray system comprises an air pressure injection pipe, a booster pump is arranged on the air pressure injection pipe, the air pressure injection pipe is connected to a salt solution supply container, the outlet of the air pressure injection pipe is connected to the tail end of a connecting pipe, the front end of the connecting pipe is connected to a multi-channel pipe, a negative pressure fan is arranged in each channel of the multi-channel pipe and near the channel outlet; a mesh component is arranged in the connecting pipe, and a plurality of cone tips arranged at intervals are arranged on the windward surface of the mesh component, and the length of the cone tips is not more than 8mm.
[0009] As a preferred solution, the mesh component adopts a stainless steel filter, the cone tip adopts a needle tip fixed on the stainless steel filter, the aperture of the mesh component is not greater than 5mm, and the wire diameter of the mesh component is not greater than 3mm.
[0010] Furthermore, a plurality of mesh components are arranged at intervals, and the cone tips on two adjacent mesh components are arranged in a staggered manner. With such a solution, the continuous fragmentation of the salt mist droplets can be achieved, which is conducive to obtaining granular salt droplets with relatively smaller particle sizes.
[0011] Furthermore, the inner cavity of the connecting pipe has a plurality of throats arranged at intervals, and every two mesh components are installed in the same expansion area downstream of the throats. With such a solution, the salt spray droplets can be broken multiple times in a narrow space at a relatively small fluid speed.
[0012] Furthermore, each channel of the multi-channel tube is an arc channel, and the center line of each arc channel corresponds to a parabolic trajectory. With such a solution, the generated salt spray droplets can be classified into salt spray droplets of multiple bandwidths and drawn out separately, so as to facilitate more targeted salt spray testing.
[0013] As a preferred solution, the end of the connecting pipe is a horizontally arranged expansion opening, and the expansion opening is connected to the distribution chamber.
[0014] Furthermore, the inner wall of the connecting pipe, the distribution chamber, the inner wall of the multi-channel pipe, the mesh assembly and the surface of the cone tip are all provided with a hydrophobic coating. Such a solution can significantly improve the efficiency and effect of breaking up the salt spray droplets.
[0015] As a preferred solution, the inner diameter of the air pressure jet pipe is not greater than 10 mm, and the outer diameter of the working section of the mesh component is not greater than 60 mm.
[0016] As a preferred solution, the annular edge of the mesh assembly is clamped between the flanges of the connecting pipe.
[0017] As a preferred solution, the distribution chamber has a top outlet channel and a bottom outlet channel, and the multi-channel tube is connected to the side wall of the distribution chamber.
[0018] Beneficial effects: The salt spray generator spray system provided by the present invention can not only spray salt spray particles with a conventional bandwidth, but also can spray large-particle salt droplets, and can also smoothly spray a plurality of large-particle salt droplets with different bandwidths from different channels, and can smoothly spray large-particle salt droplets with a diameter of 100 microns, which is conducive to carrying out salt spray acceleration tests in a situation closer to the actual state; by adopting the scheme of the present invention, only about 40 centimeters of connecting pipes and multi-channel pipes are needed to realize the spraying of large-particle salt droplets, the efficiency of generating large-particle salt droplets is high, the system occupies a small space, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 Schematic diagram of the salt spray generator spray system in the embodiment; Figure 2 A schematic diagram of the salt spray generator spray system in the embodiment; Figure 3 It is a side schematic diagram of the mesh component of the salt spray generator spray system in the embodiment. DETAILED DESCRIPTION
[0020] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that when the salt spray corrosion test is carried out using the salt spray generator spray system in the embodiment, it is best to install the specimens near the outlets of the upper channel, the lower channel, the top outlet channel and / or the bottom outlet channel, otherwise the volume of large-particle salt droplets generated will accumulate again. Example 1
[0021] Combination Figures 1 to 3As shown, a salt spray generator spray system comprises an air pressure injection pipe 1, a booster pump is arranged on the air pressure injection pipe 1, the air pressure injection pipe 1 is connected to a salt solution supply container, the outlet of the air pressure injection pipe 1 is connected to the tail end of a connecting pipe 2, the front end of the connecting pipe 2 is connected to a multi-channel pipe 14, and a negative pressure fan (for assisting in drawing out granular salt droplets) can be arranged in each channel of the multi-channel pipe 14 and near the channel outlet; a mesh component 4 is arranged in the connecting pipe 2, the ring edge of the mesh component 4 is clamped between the flanges of the connecting pipe 2, and the windward surface of the mesh component 4 is provided with a plurality of spaced cone tips 28, the length of the cone tips 28 is not more than 8 mm, and the cone tips 28 are similar to the structure of a sewing needle. Among them, the connecting pipe 2 includes a first expansion section 3 (length 15 cm), a reduced diameter section 5 (length 12 cm), and a second expansion section 31 (length 5 cm) connected in sequence, the first mesh component 22 and the second mesh component 24 are installed on the first expansion section 3, the third mesh component and the fourth mesh component are installed on the second expansion section 31, and the connection part of the air pressure injection pipe 1 and the first expansion section 3 and the connection part of the reduced diameter section 5 and the second expansion section 31 are respectively used as the throat 29.
[0022] In this embodiment, the mesh component 4 adopts a stainless steel filter, the cone tip 28 adopts a needle tip fixed on the stainless steel filter, the aperture of the mesh component 4 is 4mm, the wire diameter of the mesh component 4 is 3mm; the inner diameter of the air pressure injection tube 1 is 8mm, and the outer diameter of the working section of the mesh component 4 is 50mm.
[0023] In this embodiment, combined with Figure 2 As shown, there are multiple mesh components 4 arranged at intervals, and four mesh components 4 are schematically shown in the figure, and the cone tips 28 on two adjacent mesh components 4 are staggered, that is, the first cone tip 21 on the first mesh component 22 is opposite to the mesh on the second mesh component 24.
[0024] In this embodiment, the inner cavity of the connecting pipe 2 has a plurality of throats 29 arranged at intervals, and every two mesh components 4 are installed in the same expansion area downstream of the throat 29; each channel of the multi-channel pipe 14 is an arc channel, and the center line of each arc channel corresponds to a parabolic trajectory. Figure 1 Schematically embodies a two-channel tube 14 including a first upper channel 19 and a lower channel 17 , wherein the upper channel 19 and the lower channel 17 are separated by a partition 18 .
[0025] In this embodiment, the end of the connecting tube 2 is a horizontally arranged expansion mouth 8, which is connected to the distribution chamber 12. The main function of the distribution chamber 12 is to reduce the pressure of the salt spray fluid and assist the airflow to distribute salt spray particles of different bandwidths to the corresponding channels; the inner wall of the connecting tube 2, the distribution chamber 12, the inner wall of the multi-channel tube 14, the mesh component 4 and the surface of the cone tip 28 are all provided with a hydrophobic coating; the distribution chamber 12 has a top outlet channel 10 and a bottom outlet channel 30, and the multi-channel tube 14 is connected to the side wall of the distribution chamber 12.
[0026] During use, combine Figure 1 and Figure 2As shown, the saline solution is sprayed into the inner cavity of the first expansion section 3 through the air pressure injection tube 1, and after being accelerated in the inner cavity of the first expansion section 3, the droplets 27 are formed and hit the mesh component 4. The first part of the droplets 27 will directly hit the tip of the second cone tip 23 on the second mesh component 24 and be broken into slightly smaller droplets 26. Subsequently, the droplets 26 hit the first cone tip 21 on the first mesh component 22 again and continue to be broken into smaller droplets 7. The droplets 7 then enter the inner cavity 6 of the diameter-reducing section 5; then, the droplets 25 enter the second expansion section 3. The inner cavity of segment 31 will hit the cone-shaped bodies on the third mesh component and the fourth mesh component in sequence, thereby further breaking up the droplets 25 to obtain droplets C with smaller particle sizes; the second part of the droplets 27 will pass through the mesh of the second mesh component 24, and will be broken into relatively small droplets A by the cone-shaped bodies on other mesh components subsequently; the third part of the droplets 27 will hit the screen on the mesh component and will also be broken into relatively small droplets B; the droplets C, A and B will eventually form mixed droplets 9 of different particle sizes together in the expansion mouth 8. Subsequently, the mixed droplets 9 enter the distribution chamber 12 and are divided into four types of particles under the action of the forward force. The first type of particles 11 in the mixed droplets 9 are salt spray particles close to the atomized state. The first type of particles 11 are mainly suspended in the upper part of the distribution chamber 12 and are led out through the top outlet channel 10. The forward force comes from the fan 20 on the side of the inner wall of the distribution chamber 12. The second type of particles 15 in the mixed droplets 9 are small salt spray particles with a diameter slightly larger than that of the particles in the atomized state. The second type of particles 15 are led out through the upper channel 19. The forward force comes from the blowing force in the air pressure injection pipe 1 and the suction force of the corresponding negative pressure fan. The flow trajectory of the second type of particles 15 is a parabolic path as shown by the light-colored arrow line in the upper channel 19. The third particles 16 in the mixed droplets 9 are large-particle salt droplets with a diameter slightly larger than that of the second particles 15. The third particles 16 are drawn out through the lower channel 17, and their forward force comes from the blowing force in the air pressure injection pipe 1 and the suction force of the corresponding negative pressure fan. The flow trajectory of the third particles 16 is shown by the light-colored arrowed lines in the lower channel 17, and also presents a parabolic path; the fourth particles 13 in the mixed droplets 9 are large-particle salt droplets with a diameter slightly larger than that of the third particles 16. The fourth particles 13 are drawn out through the bottom outlet channel 30, and their forward force comes from the fourth particles 13's own gravity, the blowing force in the air pressure injection pipe 1 and the suction force of the corresponding negative pressure fan. The flow trajectory of the fourth particles 13 is mainly vertically downward.
[0027] In this embodiment, a 5% salt solution specified in the salt spray test standard is used. When the fluid pressure in the air pressure injection pipe 1 is controlled to be 0.9 MPa, the particle size of the first particles 11 is measured by a salt spray particle size detector. The particle size is mainly distributed in a band (range) of ≤2 microns (mainly referring to a proportion of more than 90%), the particle size of the second particles 15 is mainly distributed in a band (range) of 1 to 40 microns, the particle size of the third particles 16 is mainly distributed in a band (range) of 20 to 300 microns, and the particle size of the fourth particles 13 is mainly distributed in a range of hundreds of microns to 1.5 mm.
[0028] The main structure of comparative example 1 refers to example 1, and the difference between it and example 1 is that a stainless steel wire mesh (filter) is used to replace the mesh component, and the aperture is the same as that of example 1. When the fluid pressure in the air pressure injection pipe 1 is controlled to be 0.9Mpa, the amount of the first particles 11 is very small (negligible) by means of a salt spray particle size detector, and the amount of the second particles 15 and the third particles 16 is also very small. Most of the particles are concentrated in the bottom outlet channel 30, and the particle size is mainly distributed in the range of hundreds of microns to 4mm. By comparison, it can be seen that the use of the specific mesh component in example 1 is conducive to the smooth ejection of multiple granular salt droplets with different bandwidths from different channels, and can smoothly eject large granular salt droplets with a diameter of hundreds of microns from a specific channel.
[0029] In the present invention, the mesh component with a cone tip and the hydrophobic coating used are very critical. This structure can not only continuously and effectively break up the salt spray droplets, and analysis shows that its breaking mechanism is similar to that of water droplets hitting the surface of a lotus leaf and instantly dispersing into a large number of tiny droplets, but also can effectively prevent the salt spray droplets from growing larger on the cone tip (multiple salt spray droplets combine on the cone tip to form large particle droplets). Example 2
[0030] A salt mist generator spray system, referring to Example 1, is different from Example 1 in that: a greater number of mesh components 4 can be arranged, and a greater number of first expansion sections 3 and diameter reduction sections 5 can also be arranged.
[0031] The salt spray generator spray system in Example 1 can not only spray salt spray particles with a conventional bandwidth, but also can spray large-particle salt droplets, and can also smoothly spray a plurality of large-particle salt droplets with different bandwidths from different channels, and can smoothly spray large-particle salt droplets with a diameter of 100 microns, which is conducive to carrying out salt spray acceleration tests in a situation closer to the actual state. Only about 40 centimeters of connecting pipes and multi-channel pipes are needed to realize the spraying of large-particle salt droplets. The efficiency of generating large-particle salt droplets is high, the system occupies a small space, and the structure is simple.
Claims
1. A salt spray generator spray system, comprising an air pressure injection pipe (1), on which a booster pump is provided, and the air pressure injection pipe (1) is connected to a salt solution supply container, characterized in that: The outlet of the air pressure injection pipe (1) is connected to the rear end of the connecting pipe (2), the front end of the connecting pipe (2) is connected to the multi-channel pipe (14), and a negative pressure fan is arranged in each channel of the multi-channel pipe (14) and near the channel outlet; a mesh component (4) is arranged in the connecting pipe (2), and a plurality of cone tips (28) arranged at intervals are arranged on the windward surface of the mesh component (4), and the length of the cone tips (28) is not greater than 8 mm.
2. The salt spray generator spray system according to claim 1, characterized in that: The mesh component (4) adopts a stainless steel filter screen, the cone tip body (28) adopts a needle tip fixed on the stainless steel filter screen, the aperture of the mesh component (4) is not greater than 5 mm, and the wire diameter of the mesh component (4) is not greater than 3 mm.
3. The salt spray generator spray system according to claim 2, characterized in that: A plurality of mesh components (4) are arranged at intervals, and the cone tips (28) on two adjacent mesh components (4) are arranged in a staggered manner.
4. The salt spray generator spray system according to claim 3, characterized in that: The inner cavity of the connecting pipe (2) has a plurality of throats (29) arranged at intervals, and every two mesh components (4) are installed in the same expansion area downstream of the throats (29).
5. The salt mist generator spray system according to any one of claims 1 to 4, characterized in that: Each channel of the multi-channel tube (14) is an arc-shaped channel, and the center line of each arc-shaped channel corresponds to a parabolic trajectory.
6. The salt mist generator spray system according to claim 5, characterized in that: The end of the connecting pipe (2) is a horizontally arranged expansion opening, and the expansion opening is connected to the distribution chamber (12).
7. The salt mist generator spray system according to claim 6, characterized in that: The inner wall of the connecting tube (2), the distribution chamber (12), the inner wall of the multi-channel tube (14), the mesh component (4) and the surface of the cone tip (28) are all provided with a hydrophobic coating.
8. The salt mist generator spray system according to claim 7, characterized in that: The inner diameter of the air pressure injection pipe (1) is not greater than 10 mm, and the outer diameter of the working cross section of the mesh component (4) is not greater than 60 mm.
9. The salt mist generator spray system according to claim 8, characterized in that: The annular edge of the mesh assembly (4) is clamped between the flanges of the connecting pipe (2).
10. The salt mist generator spray system according to claim 9, characterized in that: The distribution chamber (12) has a top outlet channel (10) and a bottom outlet channel (30), and a multi-channel tube (14) is connected to the side wall of the distribution chamber (12).