Salt mist uniformity regulation and control device and control method

Abstract

The invention discloses a salt mist uniformity regulation and control device and a control method. Comprising a salt spray test box connected with a salt spray generator, a test chamber used for carrying out a salt spray test is arranged in the salt spray test box, and a salt spray internal circulation regulation and control system is arranged in the salt spray test box; the control method comprises the steps that the salt mist generator is started, salt mist generated by the salt mist generator enters the salt mist mixed flow chamber, and the salt mist particle distribution and the salt mist uniformity of the test chamber are adjusted by controlling the winding amount of the winding mechanism. By adopting the scheme provided by the invention, not only can salt mist particle distribution and salt mist uniformity in a sample area be quickly adjusted, but also large-particle salt mist re-formed in the test chamber is remarkably reduced, and the salt mist uniformity in the sample area can be ensured in a long-time use process; the response time for adjusting the distribution of the salt mist particles in the sample area is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of salt spray testing equipment technology, specifically to a salt spray uniformity control device and control method. Background Technology

[0002] The previously developed comprehensive wet and hot salt spray atmosphere test equipment (CN113916755A) includes a cabinet and cabinet doors. The cabinet contains a main chamber for comprehensive testing space. A spray tower is positioned on the upper side wall of the salt spray chamber, and the spray tower is connected to a salt spray source on the cabinet. The salt spray chamber and the air conditioning chamber are connected by a first air duct, and a first fan unit is installed on the first air duct. The air conditioning chamber is a U-shaped chamber, and at least one partition extending from the port end to the U-shape is suspended in the U-shaped chamber. The air conditioning chamber and the main chamber are connected by a second air duct, which is located at the top of the air conditioning chamber and the main chamber. A second fan unit is installed on the second air duct. The inlet and outlet of the air conditioning chamber are both located at the port end of the U-shaped chamber, and the inlet and outlet are located on both sides of the partition. There is at least one partition. The top of the main chamber has multiple air holes connected to the second air duct.

[0003] The aforementioned salt spray equipment still has the problem of needing to optimize the uniformity of salt spray particles during use, especially during long-term use (continuous salt spray supply time exceeding one hour), when the uniformity of salt spray in the sample area is poor, and large salt spray particles are easily generated. In addition, it is difficult to quickly adjust the distribution of salt spray particles in the sample area while ensuring salt spray uniformity using existing salt spray testing equipment, and the response time for adjusting the distribution of salt spray particles in the sample area is long. Summary of the Invention

[0004] At least in response to the technical problems mentioned in the background art, the present invention aims to provide a salt spray uniformity regulation device and control method.

[0005] A salt spray uniformity control device includes a salt spray test chamber connected to a salt spray generator, a test chamber for conducting salt spray tests is provided inside the salt spray test chamber, and a salt spray internal circulation control system is provided inside the salt spray test chamber.

[0006] To facilitate easier control of salt spray uniformity, the salt spray internal circulation control system includes: a horizontal partition dividing the salt spray test chamber into an upper chamber and a lower chamber, with a fan installed in the upper chamber; and louvers dividing the lower chamber into a test chamber and a salt spray mixing chamber. The louvers are connected to a drive mechanism, with the upper end connected to the horizontal partition and the lower end connected to the bottom wall of the salt spray test chamber. The right side of the upper chamber communicates with the salt spray mixing chamber, the left side of the upper chamber communicates with the test chamber, and the test chamber communicates with the salt spray mixing chamber. The salt spray generated by the salt spray generator circulates along the path of the salt spray mixing chamber, the upper chamber, the test chamber, and the salt spray mixing chamber, with some of the salt spray circulating along the path of "salt spray mixing chamber - upper chamber - test chamber - salt spray mixing chamber".

[0007] To ensure smooth salt spray circulation, a vertical baffle is installed in the salt spray mixing chamber. The upper end of the vertical baffle is connected to a horizontal baffle, and the lower end of the vertical baffle is suspended. Multiple vertical baffles are arranged at intervals in the upper chamber. The lower end of the vertical baffles is connected to the horizontal baffle, and the upper end of the vertical baffles is suspended.

[0008] To facilitate better control of salt spray uniformity, strip-shaped holes are installed between adjacent vertical partitions and on the horizontal partition. An arc-shaped component is installed above the strip-shaped holes and mounted on the top wall of the salt spray test chamber. This design, with the strip-shaped holes and arc-shaped component, is more conducive to the smooth flow of salt spray into the test chamber (compared to existing designs that do not use strip-shaped holes and arc-shaped components).

[0009] To ensure stable control of salt spray uniformity, the upper end of the vertical partition is suspended from the horizontal partition by a thin rope with a diameter no greater than 1 mm. Furthermore, the gaps between the vertical partition and the side wall of the salt spray test chamber, as well as between the vertical partition and the horizontal partition, are all no greater than 1 mm. This design allows the vertical partition, suspended from the horizontal partition by a thin rope, to ensure that the recirculating salt spray flows vertically upwards into the upper chamber in a more stable manner, thus enabling stable control of salt spray uniformity.

[0010] To achieve more stable and rapid control of salt spray uniformity and significantly reduce the reformation of large salt spray particles within the test chamber, the upper part of the arc-shaped component is made of an elastic porous material, while the lower part is made of a rigid material. The lower cross-section of the arc-shaped component is crescent-shaped, while the top surface is flat. The length of the arc-shaped component is equal to the length of the strip-shaped orifice, and the length of the arc-shaped component is the same as the width of the upper chamber. The arc-shaped component is suspended from a winding mechanism on the top wall of the salt spray test chamber by a thin rope with a diameter no greater than 1 mm. This design cleverly utilizes the combination of elastic porous material and the arc-shaped component to achieve more stable and rapid control of the salt spray particle distribution within the test chamber, significantly reducing the response time for adjusting the salt spray particle distribution in the sample area and substantially reducing the reformation of large salt spray particles within the test chamber.

[0011] Furthermore, multiple sample placement plates are arranged at intervals within the test chamber. The left end of the sample placement plate does not contact the left side wall of the salt spray test chamber, and the right end of the sample placement plate is attached to the louvers.

[0012] Furthermore, the control method of the aforementioned salt spray uniformity control device includes the following steps: Step 1: Turn on the salt spray generator to allow the salt spray it produces to enter the salt spray mixing chamber; Step 2: Adjust the salt spray particle distribution and salt spray uniformity in the test chamber by controlling the winding amount of the winding mechanism.

[0013] Preferably, the upper part of the arc-shaped component is made of sponge.

[0014] Beneficial effects: The solution of this invention can not only quickly adjust the salt spray particle distribution and salt spray uniformity in the sample area, but also significantly reduce the large salt spray particles that are reformed in the test chamber. It can ensure the salt spray uniformity in the sample area during long-term use and greatly shorten the response time for adjusting the salt spray particle distribution in the sample area. The response time can be controlled within two seconds. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the salt spray uniformity control device in Example 1 (excluding the salt spray generator, top cover and its accessories). Figure 2 This is a cross-sectional schematic diagram of the salt spray uniformity control device in Example 1 (excluding the salt spray generator); Figure 3 This is a schematic diagram of the arc-shaped component of the salt spray uniformity control device in Example 1. Detailed Implementation

[0016] The following detailed description illustrates the specific implementation method. In this invention, when using saturated brine and a preset constant process to generate salt spray, the greater the number of main salt spray particles in the detection area, the better the salt spray uniformity. Main salt spray particles refer to the salt spray particles in the region where the particle size distribution is most concentrated within the standard detection area. Example 1

[0017] Combination Figures 1 to 3 As shown, a salt spray uniformity control device includes a salt spray test chamber 1 connected to a salt spray generator, a test chamber 3 for conducting salt spray tests is provided inside the salt spray test chamber 1, and a salt spray internal circulation control system is provided inside the salt spray test chamber 1.

[0018] The salt spray internal circulation control system includes: a horizontal partition 11 that divides the chamber of the salt spray test chamber 1 into an upper chamber 5 and a lower chamber; a fan 7 (induced draft fan) is installed in the upper chamber 5; and louvers 10 that divide the lower chamber into a test chamber 3 and a salt spray mixed flow chamber 4. The louvers 10 are connected to a drive mechanism, with the upper end of the louvers 10 connected to the horizontal partition 11 and the lower end of the louvers 10 connected to the bottom wall of the salt spray test chamber 1. The right side of the upper chamber 5 communicates with the salt spray mixed flow chamber 4, the left side of the upper chamber 5 communicates with the test chamber 3, and the test chamber 3 communicates with the salt spray mixed flow chamber 4. The salt spray generated by the salt spray generator circulates along the path of salt spray mixed flow chamber 4, upper chamber 5, test chamber 3, and salt spray mixed flow chamber 4, with some of the salt spray circulating along the path of "salt spray mixed flow chamber 4—upper chamber 5—test chamber 3—salt spray mixed flow chamber 4". Figure 2 The middle arrow indicates the direction of the salt spray flow.

[0019] In this embodiment, a vertical partition 8 is provided in the salt spray mixing chamber 4, with the upper end of the vertical partition 8 connected to the horizontal partition 11 and the lower end of the vertical partition 8 suspended. Multiple vertical partitions 9 are arranged at intervals in the upper chamber 5, with the lower end of the vertical partitions 9 connected to the horizontal partition 11 and the upper end of the vertical partitions 9 suspended. A strip hole 13 is provided between adjacent vertical partitions 9 and on the horizontal partition 11. An arc-shaped component 12 is provided above the strip hole 13. The distance between the center line of the arc-shaped component 12 and the center line of the strip hole 13 is 15mm. The arc-shaped component 12 is installed on the top wall of the salt spray test chamber 1.

[0020] In this embodiment, the upper end of the vertical partition 8 is suspended from the horizontal partition 11 by a thin rope (carbon fiber bundle, the same below) with a diameter of 1 mm, and the gap between the vertical partition 8 and the side wall of the salt spray test chamber 1 and the horizontal partition 11 is no more than 1 mm.

[0021] In this embodiment, the upper part of the arc-shaped component 12 is made of an elastic porous material (such as...). Figure 3 As shown, specifically sponge 2, which has a height of 12mm in its free state), the lower part of the arc-shaped component 12 is made of a rigid material (stainless steel), and the cross-section of the lower part of the arc-shaped component 12 is crescent-shaped. Figure 3 (As shown in Figure 3), the top surface of the arc-shaped component 12 is flat. The length of the arc-shaped component 12 is equal to the length of the strip-shaped hole 13, and the length of the arc-shaped component 12 is the same as the width of the upper chamber 5. The lower part of the arc-shaped component 12 has a height of 20 mm and a width of 50 mm. The arc-shaped component 12 is suspended from the winding mechanism 6 on the top wall of the salt spray test chamber 1 by a thin rope with a diameter of 1 mm. The winding mechanism 6 includes a motor, and the thin rope is connected to the output shaft of the motor. The lifting and lowering amplitude of the arc-shaped component 12 can be controlled by controlling the rotation of the output shaft.

[0022] In this embodiment, multiple sample placement plates 14 are arranged at intervals in the test chamber 3. The left end of the sample placement plate 14 does not contact the left side wall of the salt spray test chamber 1, and the right end of the sample placement plate 14 is attached to the louver 10.

[0023] In this embodiment, the specific structure, shape and material of the arc-shaped component 12 are very important. This arc-shaped component 12 with flexible porous material not only reduces the reformation of large-particle salt spray in the test chamber 3, but also ensures the uniformity of salt spray in the sample area during long-term use.

[0024] In this embodiment, the specific connection method of the vertical partition 8 is also crucial, as it can stabilize and regulate the uniformity and flow direction of the salt spray, ensuring that the circulating salt spray flows more smoothly in actual application scenarios (where the ground is uneven), and preventing the backflowing salt spray from interfering with the fresh salt spray that has just entered the salt spray mixing chamber 4.

[0025] During use, the salt spray generated by the salt spray generator flows along the salt spray mixing chamber 4, the upper chamber 5, the test chamber 3, and the salt spray mixing chamber 4 again. Some of the salt spray circulates along the path of "salt spray mixing chamber 4 - upper chamber 5 - test chamber 3 - salt spray mixing chamber 4". The salt spray is driven to flow in the salt spray test chamber 1 by the fan installed in the upper chamber. The salt spray is guided to flow back and mix with the fresh salt spray that has just entered the salt spray mixing chamber 4 by the louvers 10 and the vertical baffle 8. The salt spray is guided from the upper chamber 5 to the test chamber 3 by the vertical baffle 9 and the arc-shaped component 12. The distribution and uniformity of the salt spray particles are mainly regulated by the arc-shaped component 12.

[0026] A control method using the salt spray uniformity control device in this embodiment includes the following steps: Step 1: Turn on the salt spray generator to allow the salt spray it generates to enter the salt spray mixing chamber 4; Step 2: Adjust the salt spray particle distribution and salt spray uniformity in the test chamber 3 by controlling the winding amount of the winding mechanism 6; for example, in one scheme: when the number of main salt spray particles in the test chamber 3 is lower than the target number, control the winding mechanism 6 to make the arc-shaped component 12 rise until the number of main salt spray particles in the test chamber 3 equals the target number; when the number of main salt spray particles in the test chamber 3 is higher than the target number, control the winding mechanism 6 to make the arc-shaped component 12 fall until the number of main salt spray particles in the test chamber 3 equals the target number.

[0027] Compared with Example 1, the difference between Example 1 and Example 1 is that the arc-shaped component 12 is omitted.

[0028] Compared with Example 1, Example 2 differs from Example 1 in that the arc-shaped component 12 is omitted; and the upper ends of the vertical partition 1 8 and the vertical partition 2 9 are both fixedly installed.

[0029] Compared with Example 1, Example 3 differs from Example 1 in that the elastic porous material on the upper part of the arc-shaped component 12 is omitted.

[0030] Example 2, referring to Example 1, differs from Example 1 in that: the lower part of the cross-section of the arc-shaped component 12 is semi-circular, and the upper part of the cross-section of the arc-shaped component 12 is rectangular.

[0031] Performance tests were conducted on the salt spray uniformity control devices in the embodiments and comparative embodiments. Test method: The liquid used in the salt spray generator was saturated saline solution; in the free state (i.e., the initial state), the elastic porous material on the upper part of the arc-shaped component 12 was not compressed, and the height between the lowest point of the arc-shaped component 12 and the top wall of the upper chamber 5 was 32 mm; then, the arc-shaped component 12 was compressed to different heights and the test continued after different times; in the first compressed state, the elastic porous material on the upper part of the arc-shaped component 12 was slightly compressed (the compression amount of the elastic porous material was 3 mm), and the height between the lowest point of the arc-shaped component 12 and the top wall of the upper chamber 5 was 29 mm; in the second compressed state… In the case of the arc-shaped component 12, the elastic porous material on the upper part is under significant pressure (the compression of the elastic porous material is 7 mm), and the height between the lowest point of the arc-shaped component 12 and the top wall of the upper chamber 5 is 25 mm. Using a Promo2000 aerosol spectrometer (equipped with a Welas sensor), in each case, the Welas sensor of the instrument is placed on the sample placement plate 14 (i.e., the detection area). After adjusting the arc-shaped component 12 to different heights, the number of main salt spray particles (particle size 1 μm) in the detection area is measured. The results are shown in the table below.

[0032] Table 1. Number of main salt spray particles on sample placement plate 14

[0033] As can be seen, the solution in the embodiments can ensure the uniformity of salt spray in the sample area during long-term use, and the distribution of the main salt spray particles can be controlled by adjusting the height of the arc-shaped component. In particular, the solution in Embodiment 1 can maintain the stability of the main salt spray particles for a long time under the first compression state, ensuring the uniformity of salt spray and reducing the large-particle salt spray that reforms in the test chamber.

[0034] The solution of this invention can not only quickly adjust the salt spray particle distribution and salt spray uniformity in the sample area, but also significantly reduce the large salt spray particles that are reformed in the test chamber. It can ensure the salt spray uniformity in the sample area during long-term use and greatly shorten the response time for adjusting the salt spray particle distribution in the sample area. The response time can be controlled within two seconds, which is conducive to the immediate use of salt spray after adjustment.

Claims

1. A salt spray uniformity control device, comprising a salt spray test chamber (1) connected to a salt spray generator, wherein the salt spray test chamber (1) is provided with a test chamber for conducting salt spray tests, characterized in that: A salt spray internal circulation control system is installed inside the salt spray test chamber (1).

2. The salt spray uniformity control device according to claim 1, characterized in that, The salt spray internal circulation control system includes: a horizontal partition (11) for dividing the chamber of the salt spray test chamber (1) into an upper chamber (5) and a lower chamber, with a fan (7) installed in the upper chamber (5); and louvers (10) for dividing the lower chamber (13) into a test chamber and a salt spray mixing chamber (4), with the louvers (10) connected to a drive mechanism, the upper end of the louvers (10) connected to the horizontal partition (11), and the lower end of the louvers (10) connected to the salt spray test chamber. (1) The bottom wall, the right side of the upper chamber (5) is connected to the salt spray mixing chamber (4), the left side of the upper chamber (5) is connected to the test chamber, and the test chamber is connected to the salt spray mixing chamber (4); the salt spray generated by the salt spray generator flows along the salt spray mixing chamber (4), the upper chamber (5), the test chamber, and the salt spray mixing chamber (4), and some of the salt spray flows in a loop along the path of "salt spray mixing chamber (4) - upper chamber (5) - test chamber - salt spray mixing chamber (4)".

3. The salt spray uniformity control device according to claim 2, characterized in that: A vertical partition (8) is installed inside the salt spray mixing chamber (4). The upper end of the vertical partition (8) is connected to the horizontal partition (11), and the lower end of the vertical partition (8) is suspended.

4. The salt spray uniformity control device according to claim 3, characterized in that: The upper chamber (5) is equipped with multiple vertical partitions (9) arranged at intervals. The lower end of the vertical partitions (9) is connected to the horizontal partition (11), and the upper end of the vertical partitions (9) is suspended.

5. The salt spray uniformity control device according to claim 4, characterized in that: A strip hole (13) is provided between adjacent vertical partitions (9) and on the horizontal partition (11). An arc-shaped component (12) is provided above the strip hole (13) and is installed on the top wall of the salt spray test chamber (1).

6. The salt spray uniformity control device according to claim 5, characterized in that: The upper end of the vertical partition (8) is suspended from the horizontal partition (11) by a thin rope with a diameter of no more than 1 mm, and the gap between the vertical partition (8) and the side wall of the salt spray test chamber (1) and the horizontal partition (11) is no more than 1 mm.

7. The salt spray uniformity control device according to any one of claims 5-6, characterized in that: The upper part of the arc-shaped component (12) is made of elastic porous material, the lower part of the arc-shaped component (12) is made of rigid material, the lower part of the cross section of the arc-shaped component (12) is crescent-shaped, the top surface of the arc-shaped component (12) is flat, the length of the arc-shaped component (12) is equal to the length of the strip hole (13), and the length of the arc-shaped component (12) is the same as the width of the upper chamber (5); the arc-shaped component (12) is suspended on the winding mechanism (6) on the top wall of the salt spray test chamber (1) by a thin rope with a diameter of no more than 1 mm.

8. The salt spray uniformity control device according to claim 7, characterized in that: Multiple sample placement plates (14) are arranged at intervals in the test chamber. The left end of the sample placement plate (14) does not contact the left side wall of the salt spray test chamber (1), and the right end of the sample placement plate (14) is attached to the louver (10).

9. The control method of the salt spray uniformity control device according to claim 8, characterized in that, step include: Step 1: Turn on the salt spray generator and let the salt spray it generates enter the salt spray mixing chamber (4). Step 2: Adjust the salt spray uniformity of the test chamber by controlling the winding amount of the winding mechanism (6).

10. The control method of the salt spray uniformity regulating device according to claim 9, characterized in that: The upper part of the arc-shaped component (12) is made of sponge.

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