Spraying device for salt spray test

Abstract

The invention relates to the technical field of salt spray tests, in particular to a spraying device for a salt spray test, which comprises a salt water tank, a water control float valve, a tank cover, a spray tower, a glass spray head, a filter, a conical disperser, a support rod, a floating plate and a water inlet float valve, the floating plate is connected to the lower portion of the supporting rod and located in the saline water tank, the water inlet floating valve is installed on the inner wall of the saline water tank and located above the water control floating valve, and a pressure discharge cavity is formed in the saline water tank and located under the floating plate; the height of the conical disperser is controlled by using the salt water liquid level in the salt water tank, and the conical disperser is used for collecting the settled salt water to reduce the residual amount of the salt water in the salt water tank, so that the spraying amount at the initial stage of the salt spray test is accurately compensated, and the salt water discharge amount of the salt water tank at the last stage of the test is increased, thereby ensuring the test accuracy and improving the test efficiency. And the test cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of salt spray testing, in particular to a spray device for salt spray testing. Background Art

[0002] When metal materials are used in production and manufacturing, their various properties are usually tested, such as corrosion resistance. The commonly used method for testing corrosion resistance is the salt spray test. The salt spray test chamber can provide salt spray content dozens of times that of the natural environment, so it can quickly detect the corrosion resistance of metal materials. The spray device is the core component of the salt spray test chamber.

[0003] The working principle of the spray device is developed around the glass nozzle. The bent pipe of the glass nozzle is ventilated and is located at the bottom when installed. The straight pipe of the glass nozzle is connected to the brine in the brine tank. When the high-pressure gas in the bent pipe is ejected, a negative pressure is formed at the outlet of the straight pipe, thereby absorbing the brine in the brine tank and breaking the outflowing brine into mist through the expanding gas, and then dispersed through the conical disperser above.

[0004] In the initial stage of the spray device, since the inner wall of the salt water pipe from the salt water tank to the glass nozzle has not been completely wetted, the spray volume of the glass nozzle is small. Correspondingly, the sedimentation of the salt water during the test is also small. In order to ensure the accuracy of the experiment, the sedimentation should be limited to a certain range. Therefore, efforts will be made to increase the initial spray volume of the spray device. There are two common ways: one is to increase the height of the conical disperser; the other is to increase the jet pressure of the glass nozzle; but both methods have obvious disadvantages: in the first method, since the disperser has no control device, its height cannot be controlled from the outside, and the only way is to open the salt spray test chamber for manual control. Before opening, in order to avoid salt mist overflow, a demisting operation must be performed first, which is not only wasteful but also time-consuming. This not only increases the use of brine consumables, but also prolongs the test time, thereby increasing the test cost. In the second method, at the initial stage of the spray device's operation, the gas pressure of the air supply equipment (such as a saturated air barrel) is increased to increase the spray volume of the spray device. However, increasing the air pressure will also affect other gas parameters, such as gas temperature (high-pressure gas will cool down when it expands rapidly at the outlet of the glass nozzle. To avoid the impact of cooling on the solubility of salt in the salt spray, the gas must first be heated in the saturated air barrel. When the air pressure is higher and the expansion is more intense, the heating temperature of the gas must also be further increased). This places higher demands on the energy consumption and structural strength of the equipment, and also increases the test cost.

[0005] In order to improve the initial spray volume of the spray device without wasting salt water, prolonging the test, or increasing energy consumption, thereby better reducing the test cost, a spray device for salt spray test is proposed. Summary of the Invention

[0006] The object of the present invention is to provide a spray device for a salt spray test, which solves the problem of a small spray volume in the initial stage of operation of the spray device for a salt spray test. By utilizing the brine liquid level in a brine tank to control the height of a conical disperser, and utilizing the conical disperser to collect settled brine to reduce the amount of brine residual in the brine tank, the spray volume is compensated in the initial stage of the salt spray test, and a complementary relationship between the compensated amount and the actual spray volume is maintained, thereby ensuring the accuracy of the compensation. At the same time, the brine discharge volume is increased at the end of the test to reduce brine waste, thereby reducing the purpose of reducing the test cost.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A spray device for salt spray testing, comprising a salt water tank, a water control float valve, a tank cover, a spray tower, a glass nozzle, a filter, a conical disperser, a support rod, a floating plate, and a water inlet float valve. The conical disperser is located above the spray tower, the support rod is arranged below the conical disperser, the floating plate is connected below the support rod, and the floating plate is located inside the salt water tank. The water inlet float valve is installed on the inner wall of the salt water tank and is located above the water control float valve. A pressure discharge chamber is opened inside the salt water tank, and the pressure discharge chamber is located directly below the floating plate.

[0009] The water inlet float valve guides external salt water into the salt water tank and controls the liquid level in the salt water tank to a set height to complete the initial water inlet. The float plate is affected by the buoyancy of the salt water in the salt water tank and drives the conical disperser upward with the help of the support rod to increase the initial spray volume. The float plate fills the pressure discharge cavity at the end of the salt spray test.

[0010] In the prior art, in order to simplify the process and save costs, the brine tank is usually made into a cylindrical or cubic shell with uniform wall thickness. However, the brine tank of the above structure has the problem that the brine cannot be completely drained during use, and the spray volume at the end of the test is relatively small. The reasons are as follows: the water control float valve is externally connected to a brine replenishing device (such as a brine replenishing bottle). Before the test, the operator will first prepare a brine solution of corresponding concentration and volume and add the prepared solution to the brine replenishing bottle at one time. As the brine in the brine tank is consumed, the brine solution in the brine replenishing bottle will continuously enter the brine tank through the water control float valve to maintain the brine level in the brine tank stable. However, when the salt spray test is nearing the end, the brine solution in the brine replenishing bottle is completely consumed and can no longer be replenished into the brine tank. Thereafter, the brine level in the brine tank will continue to drop, thereby causing the pressure difference between the bottom of the brine tank and the glass nozzle to become smaller and smaller, making it increasingly difficult to discharge the brine solution in the brine tank until the brine level reaches the "minimum brine discharge water level line". The brine can no longer be discharged and the glass nozzle stops working.

[0011] There are usually two ways to solve the above negative phenomenon: one is to prepare a larger volume of saline solution before the experiment, so that the salt spray test can be completed before the saline solution in the saline replenishment bottle is completely consumed, thereby preventing the saline liquid level in the saline tank from dropping and stabilizing the spray volume at the end of the test; the other is to increase the spray pressure of the glass nozzle at the end of the test, thereby further reducing the air pressure at the glass nozzle, thereby maintaining the pressure difference between the bottom of the saline tank and the glass nozzle, so that the spray volume remains normal while the saline liquid level in the saline tank drops;

[0012] Compared to this solution, while the aforementioned solution 1 effectively addresses the issue of "low spray volume at the end of the test," it fails to address the issue of "inability to completely drain the brine." Furthermore, it further increases the volume of inability to completely drain the brine. Besides sodium chloride, the brine may also contain glacial acetic acid, copper chloride, and other components (the ASS salt spray test adds glacial acetic acid to the sodium chloride solution, while the CASS salt spray test adds sodium chloride to the glacial acetic acid). Furthermore, to ensure test accuracy, the inability to drain the brine cannot be reused. Therefore, the production and recovery of residual brine increases the cost of the brine test. The aforementioned solution 2 addresses both the "low spray volume at the end of the test" and "inability to completely drain the brine." However, the timing of spray volume adjustment is difficult to predict. Furthermore, as the pressure of the gas ejected from the glass nozzle increases, the heating temperature of the gas must be increased to prevent the gas from cooling too low due to instantaneous expansion, thereby reducing the solubility of the brine. This further increases energy consumption during the test. Furthermore, the high-pressure and high-temperature environment places higher demands on the structural strength of related components, leading to increased testing costs.

[0013] Preferably, the pressure discharge chamber includes a compression section and a filtration section from top to bottom, and the height of the compression section is greater than the lowest water level line of the brine discharge;

[0014] In the above scheme, the structure of the bottom surface of the brine tank is first improved through the design of the compression section and the filtration section, so that when the water control float valve no longer takes in water at the end of the test, the remaining brine in the brine tank can make use of the compression section and the filtration section with a smaller bottom area to raise its own liquid level, thereby increasing the pressure inside the filtration section to ensure normal mist discharge from the glass nozzle; further, the lowest water level line for brine discharge is set inside the compression section, so that the volume of brine that cannot be discharged is reduced as much as possible through the smaller bottom area of ​​the compression section; further, the float plate is made to fall inside the compression section, so that the compression section is filled with the help of the float plate, so that more brine can be above the lowest water level line for brine discharge, and thus can be smoothly sprayed out through the glass nozzle.

[0015] During the initial use of the salt spray test spray device, the spray volume is usually low. Relevant data shows that this period lasts about 16 hours. The specific reason is that the brine in the brine tank needs to pass through a pipe to enter the glass nozzle. The area of ​​the brine outlet at the glass nozzle is extremely small. Therefore, the brine in the pipe is not saturated and the flow rate is slow. Therefore, it takes a long time for the brine to wet the pipe, resulting in a low spray volume in the early stage of the salt spray test.

[0016] In the prior art, for the convenience of installation, a rubber hose is usually used to connect the filter and the glass nozzle. However, the shape of the rubber hose is not fixed, and the position of the filter in the salt water tank is not fixed. Therefore, the length of the rubber hose immersed in the salt water tank is uncontrollable. Correspondingly, the length of the rubber hose immersed in the salt water tank is also variable. Therefore, it is impossible to accurately grasp the time taken to wet the rubber pipe (with normal spray) in the early stage of the salt spray test. If the salt water sedimentation is used for detection, accurate data cannot be obtained either, because similar to the measurement of rainfall, the detection of salt water sedimentation requires a long period, generally more than 1 hour. In summary, only using a rubber hose to connect the filter and the glass nozzle cannot accurately grasp the time taken to wet the rubber pipe in the early stage of the salt spray test. Therefore, if the spray amount in the early stage of the salt spray test is compensated, it is also difficult to accurately grasp the compensation time.

[0017] Preferably, the filtration section is coaxial with the compression section, the filter is installed inside the filtration section, an L-tube is installed above the filter, and the L-tube is made of rigid insulation material, a tube groove is opened on the right wall of the brine tank, and the tube groove passes through the upper surface of the right wall of the brine tank, a clamping plate is provided on the right side of the tank cover, the clamping plate is inserted into the tube groove, and the right end of the L-tube is located between the clamping plate and the tube groove;

[0018] In the above scheme, a rigid L-tube is used to connect the filter, and the brine is led out of the brine tank through the fixed-shape L-tube, and then connected to the glass nozzle through a rubber hose. On the one hand, the length of the L-tube that is soaked by brine in the brine tank is fixed, and thus the time for the brine to wet the pipe in the early stage of the test is fixed (accurate time data can be obtained through multiple measurements), so as to accurately grasp the time for compensating the spray volume in the early stage of the test; on the other hand, the rigid L-tube inserted in the center of the float plate can also cooperate with the support rod to form a more stable positioning effect for the float plate, making the float plate slide up and down more smoothly, thereby ensuring the reliability of the equipment operation. Furthermore, in order to keep the brine in the L-tube warm and ensure the solubility of the salt in the brine, the L-tube is made of insulating material.

[0019] In the existing technology, there are usually two ways to adjust the spray volume. One is to adjust the conical disperser. The higher its position, the greater the mist output. The other is to adjust the jet pressure of the glass nozzle. However, this method is not commonly used because changes in air pressure will also cause changes in other data such as gas temperature, which not only affects the accuracy of the test but also increases the cost of the test. However, these two methods have a common problem. Whether adjusting the conical disperser or adjusting the air pressure, it is usually done manually. Therefore, such adjustments must be limited in number. However, the spray volume in the salt spray test is a difficult data to detect (the detection cycle is long). It is difficult to ensure the accuracy of the spray volume compensation through only a limited number of adjustments.

[0020] Preferably, the support rod includes an outer rod and an inner rod, a plurality of the outer rods are arranged in an annular array above the slot cover, a plurality of the inner rods are respectively inserted into the plurality of outer rods, and the length of the inner rod is greater than that of the outer rod, the lower end of the inner rod is connected to the floating plate, and the conical disperser is provided with a blocking hole, a plurality of the blocking holes are arranged in an annular array on the circumference of the conical disperser, and the blocking holes are arranged as two-stage stepped holes with the large hole at the bottom;

[0021] In the above scheme, first, the inner rod (connected to the float) is lowered as the brine level in the brine tank drops, which in turn continuously lowers the raised conical disperser, thereby gradually reducing the amount of salt mist compensation. This forms a complementary relationship with the gradual wetting of the L-tube and the rubber hose connecting the L-tube to the glass nozzle, thereby forming a precise compensation. Secondly, the gradually decreasing liquid level in the brine tank also enhances the above-mentioned compensation effect.

[0022] There are many types of salt spray tests, such as NSS, ASS, and CASS. The parameters of each test are different, so the spray volume also needs to be adjusted accordingly. That is, the height of the conical disperser before and after the spray volume compensation period needs to be adjusted;

[0023] Preferably, the upper ends of the inner rod and the outer rod are respectively equipped with an inner screw sleeve and an outer screw sleeve, and the inner screw sleeve and the outer screw sleeve are respectively threadedly connected to the inner rod and the outer rod, the aperture of the small hole of the blocking hole is larger than the outer diameter of the inner screw sleeve and smaller than the outer diameter of the outer screw sleeve, and the aperture of the large hole of the blocking hole is larger than the outer diameter of the outer screw sleeve;

[0024] In the above scheme, the height of the conical disperser before the spray amount compensation period is adjusted by the threaded connection between the inner screw sleeve and the inner rod, and the height of the conical disperser after the spray amount compensation period is adjusted by the threaded connection between the outer screw sleeve and the outer rod.

[0025] Preferably, a water collecting tank is provided above the conical disperser, a drainage hole is opened in the water collecting tank, the drainage hole is connected to the water collecting tank and the baffle hole, and the drainage hole is set as a tapered hole with the small diameter end facing downward, and the inner screw sleeve, the inner rod and the floating plate are hollow and connected;

[0026] In the above scheme, the upper end surface with a larger area formed by the conical structure of the conical disperser is used to collect the settled salt water in the salt spray test chamber, and the collected salt water flows into the interior of the floating plate connected to multiple inner rods along the drainage holes to increase the draft depth of the floating plate.

[0027] During the stable operation period of the spray device, that is, when the liquid level of the brine tank is stable, the brine in the brine tank is consumed by the glass nozzle and compensated by the water control float valve. However, the temperature of the brine compensated by the water control float valve is relatively low. To ensure the solubility of the salt in the compensation brine, the compensation brine needs to be heated in the brine tank for a period of time and cannot be discharged immediately. In order to ensure that the heated brine in the brine tank is not affected by the low temperature of the compensation brine, the brine tank should have a certain volume of brine. However, if the draft of the float plate is too deep at this time, the volume of the brine in the brine tank will be reduced, thereby affecting the brine temperature and salt solubility in the brine tank.

[0028] Preferably, a push rod is installed inside the inner screw sleeve, the upper end of the push rod is set to a conical structure, and the lower end of the push rod is provided with a through hole, and the push rod passes through the drainage hole;

[0029] In the above scheme, the drainage hole is blocked and opened by the top rod, so that the settled brine in the water collection tank falls into the floating plate at the right time, thereby avoiding the influence of the excessive draft of the floating plate on the brine temperature and salt solubility in the brine tank.

[0030] Preferably, an annular wall is provided above the compression section, the highest point of the annular wall is located below the liquid level controlled by the water inlet float valve, a water channel is provided inside the lower wall of the brine tank, the water channel connects the compression section with the inner cavity of the brine tank, the opening of the water channel in the compression section is located at the bottom end of the compression section, and a one-way valve is installed at the other opening of the water channel;

[0031] In the above solution, the brine level is raised by the one-way valve and the annular wall, thereby increasing the pressure in the filtration section and ensuring the discharge speed and discharge volume of the brine in the compression section.

[0032] Preferably, the draft of the floating plate filled with salt water is greater than the height of the compression section, and a pit is provided on the lower end surface of the floating plate, the pit connecting the compression section and the filtration section;

[0033] In the above scheme, after the interior of the float is filled with brine, its draft is greater than the height of the compression section. That is, when the brine in the compression section is located below the annular wall, the bottom surface of the float must contact the bottom surface of the compression section, thereby allowing the float to completely fill the compression section. As a result, at the end of the test, brine will only remain in the gap between the float and the compression section, and the liquid level of the remaining brine will be below the lowest water level line for brine discharge. In addition, in order to allow the brine to continue to be discharged after the bottom surface of the float contacts the bottom surface of the compression section, a pit is arranged on the bottom surface of the float.

[0034] Preferably, the water control float valve and the water inlet float valve are both connected to a liquid pipe, the water inlet end of the liquid pipe is connected to a solenoid valve, and the solenoid valve is a two-position three-way type;

[0035] In the above solution, by switching the position of the solenoid valve core, the water control float valve and the water inlet float valve are respectively connected to control the brine level in the brine tank.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The present invention utilizes a float to adjust the height of the conical disperser by changing the liquid level in the brine tank. As a result, when the spray device is first operating, the conical disperser is positioned higher to compensate for the spray volume at the initial stage of the test. Furthermore, the conical disperser is lowered as the brine level decreases, thereby varying the compensation force. This variation forms a complementary relationship with the gradually increasing actual spray volume, thereby ensuring the accuracy of the spray volume compensation. Furthermore, the float raises the brine level in the brine tank through its own draft, allowing more brine to be discharged at the end of the test, thereby reducing the residual amount of brine in the brine tank and thus reducing brine waste.

[0038] 2. The present invention provides two float valves, one as a water control float valve for controlling and stabilizing the brine liquid level in the brine tank, and the other as a water inlet float valve, which is located above the water control float valve and is used for the first water inlet. At the initial stage of the test, the water inlet float valve raises the liquid level to a set height (to compensate for the spray volume) and then loses its water inlet function. While the spraying is in progress, the wettability of the brine pipeline gradually increases (the actual spray volume gradually increases), and the conical disperser descends along with the brine liquid level (the compensation effect is weakened), thereby forming a complementary relationship to ensure the accuracy of the compensation. The raised and continuously descending brine liquid level itself also has a compensation effect on the spray volume, and the compensation also has the above-mentioned complementary relationship, thereby further improving the effect of the spray volume compensation.

[0039] 3. The present invention designs a conical disperser with baffle holes formed on its circumference so that it can rise and fall to a set position under the action of a support rod, thereby completing the spray compensation and stable spray process. In addition, the conical structure of the conical disperser is utilized to form a water collecting trough at its upper end with a larger area. The settled brine collected in the water collecting trough can be discharged into the interior of the float plate at a set time, thereby further increasing the draft of the float plate. Under the premise of not affecting the brine content in the brine tank during the spray stabilization period, the float plate can increase the filling space of the compression section, thereby further discharging the remaining brine in the brine tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall isometric structure of the present invention;

[0041] Figure 2This is a schematic diagram of the internal isometric structure of the present invention;

[0042] Figure 3 For the present invention Figure 1 A magnified schematic diagram of part A;

[0043] Figure 4 For the present invention Figure 2 A magnified schematic diagram of part B;

[0044] Figure 5 This is a schematic diagram of the initial state of spraying of the present invention;

[0045] Figure 6 This is a schematic diagram of the spray stabilization period of the present invention;

[0046] Figure 7 This is a schematic diagram of the falling state of the sedimentation salt water of the present invention;

[0047] Figure 8 It is a schematic diagram of the floating plate of the present invention sinking to the bottom.

[0048] In the figure: 1. Brine tank; 11. Pressure discharge chamber; 111. Compression section; 112. Filtration section; 12. Pipe trough; 13. Water channel; 2. Water control float valve; 3. Tank cover; 31. Card plate; 4. Spray tower; 5. Glass nozzle; 6. Filter; 61. L-tube; 7. Conical disperser; 71. Baffle hole; 72. Water collecting trough; 73. Drainage hole; 8. Support rod; 81. Outer rod; 811. Outer screw sleeve; 82. Inner rod; 821. Inner screw sleeve; 822. Top rod; 9. Float plate; 91. Pit; 10. Water inlet float valve; 14. Ring wall; 15. One-way valve; 16. Liquid pipe; 17. Solenoid valve. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0050] See also Figures 1 to 8 The present invention provides a spray device for salt spray test, and the technical solution is as follows:

[0051] A spray device for salt spray test includes a salt water tank 1, a water control float valve 2, a tank cover 3, a spray tower 4, a glass nozzle 5 and a filter 6. The water control float valve 2 is installed on the side wall of the salt water tank 1 and is located inside the salt water tank 1. In a natural state, the water control float valve 2 is in a drooping state, and its valve port is open. External salt water normally enters the salt water tank through the water control float valve 2. When the salt water level in the salt water tank rises to a set height, the water control float valve 2 is forced to float up to close the valve port of the water control float valve 2, so that external salt water cannot enter. In this way, the salt water level in the salt water tank 1 is always maintained. At the set value; the tank cover 3 is buckled on the top of the brine tank 1, the spray tower 4, the tank cover 3 and the brine tank 1 are usually made of PVC material, the spray tower 4 and the tank cover 3 are an integrated structure, and are formed by injection molding; the glass nozzle 5 is installed on the spray tower 4, the bent pipe of the glass nozzle 5 is for air outlet and the straight pipe is for brine, the bent pipe is connected to the external pressure supply equipment (such as a saturated air barrel) to spray out gas with a certain humidity, temperature and pressure, the filter 6 is located inside the brine tank 1 and is sunk on the bottom surface of the brine tank 1, the filter 6 is connected to the straight pipe of the glass nozzle 5, when the glass When the bent pipe of the nozzle 5 sprays high-pressure gas, the pressure at the outlet of the straight pipe will be at a lower level due to the rapid flow of the surrounding gas, thereby forming a negative pressure compared to the bottom of the brine tank 1, so that the brine in the brine tank 1 is discharged from the straight pipe through the filter 6 (similar to the principle of a straw). It also includes a conical disperser 7, a support rod 8, a floating plate 9 and a water inlet float valve 10. The conical disperser 7 is located above the spray tower 4. The conical disperser 7 disperses the salt mist generated by the glass nozzle 5 to the surroundings through its own conical structure, so that the salt mist acts evenly on the test object, which can usually The spray volume of the spray device is controlled by adjusting the height of the conical disperser 7. The support rod 8 is arranged below the conical disperser 7. The floating plate 9 is connected to the bottom of the support rod 8. The floating plate 9 is located inside the brine tank 1. The water inlet float valve 10 is installed on the inner wall of the brine tank 1. The water inlet float valve 10 is located above the water control float valve 2. The structure and working principle of the water inlet float valve 10 are consistent with those of the water control float valve 2. In order to avoid interference between the drooping and floating actions of the two, the two are also misaligned in the front and rear directions. A pressure discharge chamber 11 is opened inside the brine tank 1, and the pressure discharge chamber 11 is located directly below the floating plate 9.

[0052] The water inlet float valve 10 guides external salt water into the salt water tank 1 and controls the liquid level in the salt water tank 1 to a set height to complete the initial water inlet. The float plate 9 is affected by the buoyancy of the salt water in the salt water tank 1 and drives the conical disperser 7 upward with the help of the support rod 8 to increase the initial spray volume. The float plate 9 fills the pressure discharge chamber 11 at the end of the salt spray test.

[0053] As an embodiment of the present invention, refer to Figure 2, the compression chamber 11 includes a compression section 111 and a filtration section 112 from top to bottom. The height of the compression section 111 is greater than the lowest water level line of the brine discharge; different types of salt spray tests have different lowest water levels of brine discharge. In order to increase the adaptability of the spray device, the height of the compression section 111 is increased as much as possible under the conditions permitting; an annular wall 14 is provided above the compression section 111, and the highest point of the annular wall 14 is located below the liquid level controlled by the water inlet float valve 10. A water channel 13 is provided inside the lower wall of the brine tank 1, and the water channel 13 connects the compression section 111 with the inner cavity of the brine tank 1. The opening of the water channel 13 in the compression section 111 is located at the bottom end of the compression section 111, and a one-way valve 15 is installed at the other opening of the water channel 13. The one-way valve 15 allows the brine outside the annular wall 14 to be discharged into the compression section 111 (connecting vessel principle). After the brine outside the annular wall 14 is completely discharged into the compression section 111, the brine liquid level begins to move downward in the compression section 111. At this time, the upper end of the push rod 822 just enters the drainage hole 73, causing the settled brine in the sump 72 to fall into the float 9, increasing the draft of the float 9. Then, the liquid level in the compression section 111 is raised to the annular wall 14 through the closure of the one-way valve 15, thereby further increasing the pressure in the filtration section 112 and ensuring the discharge speed and discharge volume of the brine in the compression section 111. The draft of the float 9 filled with brine is greater than the height of the compression section 111, and a pit 91 is provided on the lower end surface of the float 9, which connects the compression section 111 and the filtration section 112. The draft of the float 9 is designed by adjusting the materials of the float 9 and the support rod 8, as well as the bottom area of ​​the float 9.

[0054] The brine tank 1 is injection molded using PVC material. During the injection molding process, the compression section 111, the filtration section 112 and the ring wall 14 can be processed together. Note that the height of the ring wall 14 cannot be too high. Its highest point should be below the liquid level controlled by the water inlet float valve 10 to avoid the accumulation of brine outside the ring wall 14 when the brine is first added, resulting in the liquid level in the ring wall 14 not rising to the set height when the water inlet float valve 10 stops adding water (in order to reduce the residual brine at the end of the test, the diameter of the water channel 13 is small, so the speed of draining brine into the compression section 111 through the water channel 13 is slow); after the brine tank 1 is formed, holes are punched on its lower wall and the side wall of the compression tank, and the holes are connected to form the water channel 13, and then the one-way valve 15 is installed at the upper end of the water channel 13. For the convenience and tightness of the installation, the end of the water channel 13 can be tapped in advance, and raw tape can be wrapped around the connection of the one-way valve 15, and then connected to the thread of the end of the water channel 13.

[0055] As an embodiment of the present invention, refer to Figures 1 to 3The filtering section 112 is coaxial with the compression section 111, the filter 6 is installed inside the filtering section 112, and the outlet of the filter 6 is facing upward. An L-tube 61 is installed above the filter 6, and the L-tube 61 is made of rigid insulation material, such as PPR material. A pipe groove 12 is opened on the right wall of the brine tank 1, and the pipe groove 12 is arranged to be a long waist semicircular structure, and the pipe groove 12 passes through the upper surface of the right wall of the brine tank 1. A clamping plate 31 is provided on the right side of the tank cover 3, and an arc-shaped groove for engaging the L-tube 61 is provided below the clamping plate 31. The clamping plate 31 is inserted into the pipe groove 12, and the right end of the L-tube 61 is located between the clamping plate 31 and the pipe groove 12; the settled brine inside the float plate 9 and the inner rod 82 needs to be discharged when the salt spray test is completed. The specific method is to lift the tank cover 3 and lift the L-tube 61 together with the float plate 9, and then tilt or invert the tank cover 3 to discharge the settled brine inside the float plate 9 and the inner rod 82, and then align the L-tube 61 with the pipe groove 12, and install the tank cover 3 again.

[0056] As an embodiment of the present invention, refer to Figure 2 and Figure 4 The support rod 8 includes an outer rod 81 and an inner rod 82. A plurality of outer rods 81 are arranged in a circular array above the slot cover 3. A plurality of inner rods 82 are respectively inserted into the plurality of outer rods 81, and the length of the inner rod 82 is greater than the length of the outer rod 81. The lower end of the inner rod 82 is connected to the floating plate 9. The upper and lower ends of the outer rod 81 are raised to limit the inner rod 82. A gap is left between the middle of the outer rod 81 and the inner rod 82 to reduce friction, thereby making the floating plate 9 float and fall more smoothly. The conical disperser 7 is provided with a blocking hole 71. A plurality of blocking holes 71 are arranged in a circular array on the circumference of the conical disperser 7. , and the blocking hole 71 is set as a two-stepped hole with the large hole at the bottom; during manufacturing, the outer rod 81, the spray tower 4 and the tank cover 3 are injection molded together, and the inner rod 82 and the floating plate 9 are made of suitable materials and connected as a whole; during installation, first place the filter 6 in the filter tank, then pass the L-tube 61 through the center of the floating plate 9, and then place the floating plate 9 into the brine tank 1 (when placing it, align the L-tube 61 with the tube groove 12), then press the L-tube 61 to connect it with the filter 6, and finally align the outer rod 81 with the inner rod 82, so that the tank cover 3 falls above the brine tank 1;

[0057] During the salt spray test, the initial water inflow into the brine tank is controlled by the water inlet float valve 10, which causes the brine liquid level in the brine tank 1 to be at a higher position, thereby causing the float plate 9 to rise to a set height, thereby lifting the conical disperser 7 through the inner rod 82 to increase the spray volume in the initial stage of the salt spray test. The water inlet float valve 10 loses its water inflow function after completing the initial water inflow. As the brine in the brine tank 1 is continuously sprayed out by the glass nozzle 5, the brine liquid level gradually decreases, thereby causing the height of the float plate 9 to continuously decrease, thereby driving the conical disperser 7 to gradually descend, so that the compensation for the spray volume gradually decreases, which coincides with the nature of the initial spray volume gradually increasing, thus forming a complementary relationship. In the above process, the higher liquid level in the brine tank 1 will also increase the pressure inside the filter section 112, thereby accelerating the discharge of brine from the L-tube 61 to the glass nozzle 5, thereby further increasing the compensation for the spray volume, and as the brine liquid level decreases, this compensation also gradually weakens. When the pipe between the filter 6 and the glass nozzle 5 is fully moistened, the spray amount compensation period ends, and accordingly, the brine liquid level returns to normal, that is, it is flush with the liquid level controlled by the water control float valve 2. When the liquid level drops, the valve port of the water control float valve 2 will open and let water flow into the brine tank 1, so that the liquid level in the brine tank 1 is always flush with the liquid level controlled by the water control float valve 2; at the end of the spray compensation period, the upper end of the outer rod 81 will support the blocking hole 71, thereby separating the inner rod 82 from the conical disperser 7, so that the conical disperser 7 is stabilized in the set position under the support of the outer rod 81.

[0058] As an embodiment of the present invention, refer to Figure 6 The upper ends of the inner rod 82 and the outer rod 81 are respectively equipped with an inner threaded sleeve 821 and an outer threaded sleeve 811, which are threadedly connected to the inner rod 82 and the outer rod 81 respectively. The upper ends of the inner ring of the inner rod 82 and the outer ring of the outer rod 81 are both provided with threads, and the inner threaded sleeve 821 and the outer threaded sleeve 811 are respectively provided with external threads and internal threads that match the threads of the inner rod 82 and the threads of the outer rod 81. The aperture of the small hole of the blocking hole 71 is larger than the outer diameter of the inner threaded sleeve 821 and smaller than the outer diameter of the outer threaded sleeve 811, and the aperture of the large hole of the blocking hole 71 is larger than the outer diameter of the outer threaded sleeve 811.

[0059] As an embodiment of the present invention, refer to Figure 5 A water collecting trough 72 is provided above the conical disperser 7, and a drainage hole 73 is opened in the water collecting trough 72. The drainage hole 73 connects the water collecting trough 72 and the blocking hole 71, and the drainage hole 73 is set as a conical hole with the small diameter end facing downward. The inner screw sleeve 821, the inner rod 82 and the floating plate 9 are hollow and connected.

[0060] The larger upper end surface formed by the conical structure of the conical disperser 7 collects the settled salt water in the salt spray test chamber, and the collected salt water flows into the interior of the float plate 9 connected to the multiple inner rods 82 along the drainage holes 73. The duration of the salt spray test generally ranges from tens to thousands of hours. During this period, the float plate 9 and the inner rods 82 can accumulate a large amount of settled salt water, thereby increasing the draft of the float plate 9 in the salt water tank 1, so that the float plate 9 can fill a larger space after falling into the compression section 111, thereby reducing the volume of salt water below the lowest water level line for salt water discharge, thereby reducing the amount of salt water that cannot be discharged; of course, the weight of the float plate 9 and the parts connected to the float plate 9 can be increased during manufacturing to increase the draft of the float plate 9, but in this way, on the one hand, the increase in the weight of the parts will bring inconvenience to installation and adjustment, and on the other hand, the excessive draft of the float plate 9 will reduce the content of salt water between the water inlet float valve 10 and the water control float valve 2, thereby resulting in insufficient salt water during the spray volume compensation period.

[0061] As an embodiment of the present invention, refer to Figure 4 , a push rod 822 is installed inside the inner screw sleeve 821, and the push rod 822 is threadedly connected to the inner screw sleeve 821, so as to adjust its own height in different salt spray tests. The upper end of the push rod 822 is set to a conical structure, and the lower end of the push rod 822 is provided with a through hole. The push rod 822 passes through the drainage hole 73, and a sealing ring is installed on the drainage hole 73 to ensure that the settled salt water in the water collection tank 72 will not fall into the interior of the floating plate 9 in advance; the drainage hole 73 is blocked by the push rod 822, so that the settled salt water in the water collection tank 72 will not immediately flow out of the drainage hole 73 (And thus the draft of the float plate 9 will not be increased), but when the stable operation period of the spray device ends and enters the final stage of the test, the water control float valve 2 in the brine tank 1 no longer takes in water, and there is no temperature influence problem. The top rod 822 is driven by the float plate 9 and descends with the brine liquid level. When it descends to the set position, the upper end of the top rod 822 enters the drainage hole 73, and then guides the settled brine in the water collecting tank 72 into the interior of the float plate 9, thereby increasing the draft of the float plate 9 to fill a larger space in the compression section 111, so that more brine can be discharged.

[0062] As an embodiment of the present invention, refer to Figure 1 The water control float valve 2 and the water inlet float valve 10 are both connected to a liquid pipe 16, and the water inlet end of the liquid pipe 16 is connected to a solenoid valve 17, which is a two-position three-way type; the brine liquid level in the brine tank is controlled by the solenoid valve 17. At the beginning of the test, the solenoid valve 17 is energized, so that the liquid pipe 16 connected to the water inlet float valve 10 is filled with water, thereby completing the first water inlet. Afterwards, the solenoid valve 17 is de-energized, so that the liquid pipe 16 connected to the water control float valve 2 is filled with water. The solenoid valve 17 is arranged in the control area outside the salt spray test chamber to avoid corrosion damage to the solenoid valve 17 by salt spray.

[0063] Working principle: The present invention controls the height of the conical disperser 7 by the height of the brine liquid level in the brine tank 1, so that the conical disperser 7 has a sufficient height at the beginning of the test to compensate for the initial spray volume. The conical disperser 7 is lowered as the brine liquid level drops to reduce the compensation amount, forming a complementary relationship with the gradually increasing actual spray volume.

[0064] Specifically, in order to increase the height of the liquid level in the brine tank 1, the conical disperser 7 is placed in Figure 5 As shown in the figure, a water inlet float valve 10 is added inside the brine tank 1. The water inlet float valve 10 has the same principle as the water control float valve 2: when the valve body is drooping, the valve port is opened, and the external brine enters the brine tank 1. As the liquid level of the brine tank 1 rises, the valve body floats up, and then closes the valve port to stop the liquid from entering, thereby controlling the liquid level in the brine tank 1 to be stable at a certain position; the present invention adopts a two-position three-way electromagnetic valve 17 to control the brine inlet state of the water inlet float valve 10 and the water control float valve 2. When the electromagnetic valve 17 is energized, the water inlet float valve 1 0, and water flows into the brine tank 1. When the brine tank 1 stops flowing, the solenoid valve 17 is closed. At this time, the valve core position of the solenoid valve 17 changes, so that the liquid pipe 16 of the water control float valve 2 is unblocked, while the liquid pipe 16 of the water inlet float valve 10 is blocked. As a result, the water inlet float valve 10 loses its function of stabilizing the liquid level, and the brine level continues to drop as the glass nozzle 5 sprays. It takes some time for the brine level to drop to the level controlled by the water control float valve 2. This period of time is the spray compensation period.

[0065] In order to accurately compensate for the spray volume, the compensation period should be fixed and measurable. However, in the existing spray device, a rubber hose is used to connect the filter 6 and the glass nozzle 5. The soaking length of the rubber hose in the salt water tank 1 is not fixed, and the time for the rubber hose to be completely wetted is also not fixed, which makes the duration of the spray compensation period uncontrollable. Therefore, the present invention adds an L-tube 61 on the basis of the original rubber hose. The rigid L-tube 61 is fixed inside the salt water tank 1, which can stabilize the length of the pipe soaked in salt water. The outside of the L-tube 61 is then connected to the glass nozzle 5 through a rubber hose of fixed length, so that the duration of the spray volume compensation period can be accurately obtained through multiple measurements. In addition, the rigid L-tube 61 can also cooperate with the support rod 8 to form a stable positioning for the float plate 9, so that the rising and falling processes of the float plate 9 are smooth.

[0066] After the spray compensation period, the spray device enters a longer spray stabilization period. During this period, the liquid level in the brine tank 1 is controlled by the controlled water float valve 2 and stabilized at Figure 6The position shown in FIG1 is shown in FIG2 , and the water collecting tank 72 on the conical disperser 7 collects a large amount of settled brine during the spray stabilization period. If the settled brine is directly discharged into the interior of the floating plate 9, the gradually increasing draft of the floating plate 9 will reduce the brine content in the brine tank 1, thereby accelerating the circulation of brine inside the brine tank 1, resulting in insufficient brine temperature, thereby inducing the problem of insufficient salt solubility. Therefore, the present invention envisions the following: first, the collected settled brine is collected inside the water collecting tank 72, and at the end of the salt spray test, no more brine is introduced into the brine tank 1 (i.e., no brine exists). When the solubility problem caused by temperature occurs, the settled brine in the water collection tank 72 is discharged to the inside of the floating plate 9; specifically, the support rod 8 is divided into an inner rod 82 and an outer rod 81. At the end of the spray compensation period, the outer rod 81 presses against the blocking hole 71, so that the conical disperser 7 is separated from the support of the inner rod 82 and stabilized in the set position (the inner screw sleeve 821 and the outer screw sleeve 811 can be adjusted in advance). A push rod 822 is installed inside the inner rod 82, and the push rod 822 blocks the drainage hole 73 of the conical disperser 7, thereby preventing the settled brine in the water collection tank 72 from falling;

[0067] After the spray stabilization period, the spray device enters the final spray period. At this time, the outside world no longer introduces brine into the brine tank 1. Therefore, the liquid level in the brine tank 1 gradually drops. When it drops to the lowest water level line for brine discharge, the residual brine can no longer be sprayed out through the glass nozzle 5. For production and processing cost considerations, the residual brine should be as little as possible. Therefore, the present invention first opens a compression section 111 inside the brine tank 1, and sets the lowest water level line for brine discharge inside the compression section 111. Thus, the volume of residual brine is reduced as much as possible through the small bottom area of ​​the compression section 111.

[0068] In order to further discharge the residual brine in the brine tank 1, when the liquid level in the brine tank 1 first drops to the inside of the compression section 111, the settled brine in the water collecting tank 72 falls into the inside of the floating plate 9, thereby increasing the draft of the floating plate 9, thereby increasing the filling space of the floating plate 9 for the compression section 111. Specifically, an annular wall 14 is provided above the compression section 111, and a water channel 13 with a one-way valve 15 is provided in the lower wall of the brine tank 1, so that the brine outside the annular wall 14 can be discharged to the compression section 111 through the water channel 13 until the brine outside the annular wall 14 is drained. After that, the brine liquid level in the brine tank 1 will drop to the inside of the compression section 111, and at this time the upper end of the push rod 822 will be inserted into the drainage hole 73 ( Figure 7 As shown in the state, the settled salt water in the sump 72 falls and enters the interior of the float 9. After the draft of the float 9 increases, the liquid level in the compression section 111 is raised again by means of the closure of the annular wall 14 and the one-way valve 15, thereby allowing more salt water to be discharged. After the interior of the float 9 is filled with salt water, its draft is greater than the height of the compression section 111, which ensures that when the salt water in the compression section 111 is located below the annular wall 14, the bottom surface of the float 9 must contact the bottom surface of the compression section 111 ( Figure 8 ), so that the float plate 9 completely fills the compression section 111. As a result, at the end of the test, brine remains only in the gap between the float plate 9 and the compression section 111, and the liquid level of the remaining brine is below the lowest water level of brine discharge. In addition, in order to ensure that the brine can continue to be discharged after the bottom surface of the float plate 9 contacts the bottom surface of the compression section 111, a pit 91 is arranged on the bottom surface of the float plate 9.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A spray device for salt spray test, comprising a salt water tank (1), a water control float valve (2), a tank cover (3), a spray tower (4), a glass spray head (5) and a filter (6), characterized in that: It also comprises a conical disperser (7), a support rod (8), a floating plate (9) and a water inlet float valve (10), wherein the conical disperser (7) is located above the spray tower (4), the support rod (8) is arranged below the conical disperser (7), the floating plate (9) is connected below the support rod (8), and the floating plate (9) is located inside the salt water tank (1), the water inlet float valve (10) is installed on the inner wall of the salt water tank (1), and the water inlet float valve (10) is located above the water control float valve (2), and a pressure discharge chamber (11) is provided inside the salt water tank (1), and the pressure discharge chamber (11) is located directly below the floating plate (9); The water inlet float valve (10) guides external salt water into the salt water tank (1) and controls the liquid level in the salt water tank (1) to a set height to complete the initial water inlet. The float plate (9) is affected by the buoyancy of the salt water in the salt water tank (1) and drives the conical disperser (7) upward with the help of the support rod (8) to increase the initial spray volume. The float plate (9) fills the pressure discharge chamber (11) at the end of the salt spray test.

2. A spray device for salt spray test according to claim 1, characterized in that: The compression and discharge chamber (11) comprises, from top to bottom, a compression section (111) and a filtering section (112); the height of the compression section (111) is greater than the lowest water level line for brine discharge.

3. A spray device for salt spray test according to claim 2, characterized in that: The filtering section (112) is coaxial with the compression section (111); the filter (6) is installed inside the filtering section (112); an L-tube (61) is installed above the filter (6); and the L-tube (61) is made of a rigid heat-insulating material; a tube groove (12) is provided on the right wall of the salt water tank (1); and the tube groove (12) passes through the upper surface of the right wall of the salt water tank (1); a clamping plate (31) is provided on the right side of the tank cover (3); the clamping plate (31) is inserted into the tube groove (12); and the right end of the L-tube (61) is located between the clamping plate (31) and the tube groove (12).

4. A spray device for salt spray test according to claim 1, characterized in that: The support rod (8) comprises an outer rod (81) and an inner rod (82), a plurality of the outer rods (81) are arranged in an annular array above the tank cover (3), a plurality of the inner rods (82) are respectively inserted into the plurality of outer rods (81), and the length of the inner rods (82) is greater than the length of the outer rods (81), and the lower ends of the inner rods (82) are connected to the floating plate (9), and the conical disperser (7) is provided with a blocking hole (71), a plurality of the blocking holes (71) are arranged in an annular array on the circumference of the conical disperser (7), and the blocking holes (71) are arranged as two-stage stepped holes with the large hole at the bottom.

5. A spray device for salt spray test according to claim 4, characterized in that: An inner screw sleeve (821) and an outer screw sleeve (811) are respectively mounted on the upper ends of the inner rod (82) and the outer rod (81); the inner screw sleeve (821) and the outer screw sleeve (811) are respectively threadedly connected to the inner rod (82) and the outer rod (81); the aperture of the small hole of the blocking hole (71) is larger than the outer diameter of the inner screw sleeve (821) and smaller than the outer diameter of the outer screw sleeve (811); and the aperture of the large hole of the blocking hole (71) is larger than the outer diameter of the outer screw sleeve (811).

6. A spray device for salt spray test according to claim 5, characterized in that: A water collecting trough (72) is provided above the conical disperser (7), a drainage hole (73) is provided in the water collecting trough (72), the drainage hole (73) is connected to the water collecting trough (72) and the blocking hole (71), and the drainage hole (73) is configured as a conical hole structure with the small diameter end facing downwards, and the inner threaded sleeve (821), the inner rod (82) and the floating plate (9) are hollow inside and are connected.

7. A spray device for salt spray test according to claim 6, characterized in that: A push rod (822) is installed inside the inner screw sleeve (821), the upper end of the push rod (822) is arranged as a conical structure, and a through hole is arranged at the lower end of the push rod (822), and the push rod (822) passes through the drainage hole (73).

8. A spray device for salt spray test according to claim 2, characterized in that: An annular wall (14) is provided above the compression section (111), the highest point of the annular wall (14) being located below the liquid level controlled by the water inlet float valve (10), a water channel (13) being provided inside the lower wall of the brine tank (1), the water channel (13) being connected between the compression section (111) and the inner cavity of the brine tank (1), the opening of the water channel (13) at the compression section (111) being located at the bottom end of the compression section (111), and a one-way valve (15) being installed at the other opening of the water channel (13).

9. A spray device for salt spray test according to claim 8, characterized in that: The draft of the floating plate (9) filled with salt water is greater than the height of the compression section (111), and a recess (91) is provided on the lower end surface of the floating plate (9), wherein the recess (91) connects the compression section (111) and the filtration section (112).

10. A spray device for salt spray test according to claim 1, characterized in that: The water control float valve (2) and the water inlet float valve (10) are both connected to a liquid pipe (16); the water inlet end of the liquid pipe (16) is connected to a solenoid valve (17); and the solenoid valve (17) is a two-position three-way type.

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