A spray device for salt spray test

Abstract

The invention relates to the technical field of salt spray test, in particular to a spray device for salt spray test, 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, wherein 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 is located inside the salt water tank, the water inlet float valve is installed on the inner wall of the salt water tank, and the water inlet float valve is located above the water control float valve, a pressure discharge cavity is provided inside the salt water tank, and the pressure discharge cavity is located directly below the floating plate; the invention uses the brine liquid level in the salt water tank to control the height of the conical disperser, and uses the conical disperser to collect the settled brine to reduce the amount of brine residual in the salt water tank, thereby accurately compensating the spray amount in the initial stage of the salt spray test and increasing the amount of brine discharged from the salt water tank at the end of the test, thereby ensuring the test accuracy and reducing the test cost.

Description

Technical Field

[0001] The invention relates to the technical field of salt spray test, in particular to a spray device for salt spray test. 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 that is 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 based on 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, which is then dispersed through the conical disperser above.

[0004] In the initial stage of the spray device, the inner wall of the salt water pipe from the salt water tank to the glass nozzle has not been completely wetted, so 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 salt spray test box can only be opened for manual regulation. Before opening, in order to avoid salt spray overflow, a defog operation must be performed first, which not only wastes time but also reduces the cost. The first method not only increases the salt water consumables, but also prolongs the test time, thereby increasing the test cost. In the second method, at the initial stage of the spray device, the gas pressure of the gas supply equipment (such as a saturated air barrel) is increased to increase the spray volume of the spray device. However, while increasing the air pressure, other gas parameters will also be affected, such as gas temperature (high-pressure gas will cool down when it expands rapidly at the outlet of the glass nozzle. In order to avoid the influence of cooling on the solubility of salt in salt spray, the gas needs to be heated in the saturated air barrel first. When the air pressure is higher and the expansion is more intense, the heating temperature of the gas should also be further increased). This puts higher demands on the energy consumption and structural strength of the equipment, and also increases the test cost.

[0005] In order to increase 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 purpose of the present invention is to provide a spray device for salt spray test, which solves the problem that the spray amount of the spray device for salt spray test is small at the initial stage of operation. By using the brine liquid level in the brine tank to control the height of the conical disperser, and using the conical disperser to collect the settled brine to reduce the residual brine in the brine tank, the spray amount is compensated in the initial stage of the salt spray test, and the complementary relationship between the compensation amount and the actual spray amount is maintained, thereby ensuring the accuracy of the compensation, and increasing the brine discharge amount at the end of the test to reduce the waste of brine, 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 test, 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, wherein 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 the water inlet float valve is located above the water control float valve, and a pressure discharge cavity is opened inside the salt water tank, and the pressure discharge cavity 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, and 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 shell with a cylindrical or cubic structure with uniform wall thickness. However, the brine tank of the above structure has the phenomenon that the brine cannot be completely drained during use, and the spray volume at the end of the test is 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 stabilize the brine liquid level in the brine tank; 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 in the brine tank. Thereafter, the brine liquid level in the brine tank will continue to drop, thereby making the pressure difference between the bottom of the brine tank and the glass nozzle smaller and smaller, thereby making it more difficult to discharge the brine solution in the brine tank, until the brine liquid level reaches the "minimum water level line for brine discharge", the brine can no longer be discharged, and the glass nozzle stops working;

[0011] There are usually two ways to solve the above negative phenomena: one is to configure 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 exhausted, thereby avoiding the drop of the saline liquid level in the saline tank and stabilizing the spray volume at the end of the test; the other is to increase the jet pressure of the glass nozzle at the end of the test, and then further reduce the air pressure at the glass nozzle, thereby maintaining the pressure difference between the bottom of the salt water tank and the glass nozzle, so that the spray volume remains normal while the liquid level in the salt water tank drops;

[0012] Compared with this scheme, although the above scheme 1 solves the problem of "low spray volume at the end of the test", the problem of "the salt water cannot be completely drained" is not solved, and the capacity of the salt water that cannot be completely drained is further increased. In addition to sodium chloride, the salt water may also contain glacial acetic acid, copper chloride and other components (the ASS salt spray test will add glacial acetic acid to the sodium chloride solution, and the CASS salt spray test will add sodium chloride on the basis of glacial acetic acid). In order to ensure the accuracy of the test, the salt water that cannot be drained cannot be reused. Therefore, the production and recovery of residual salt water will increase the cost of the salt water test; the above scheme 2 can solve the problems of "low spray volume at the end of the test" and "the salt water cannot be completely drained", but the timing of adjusting the spray volume is difficult to grasp, and while the pressure of the gas ejected from the glass nozzle increases, in order to avoid the ejected gas from cooling too low due to instantaneous expansion, thereby reducing the solubility of the salt water, the heating temperature of the gas needs to be increased, which will further increase the energy consumption of the test process, and the high-pressure and high-temperature environment also puts forward further requirements on the structural strength of related parts, thereby increasing the test cost;

[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, firstly, the structure of the bottom surface of the brine tank is 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 as to ensure 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 as to fill the compression section 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] In the initial use of the spray device for salt spray test, the spray volume is usually low. Relevant data show that this period lasts about 16 hours. The specific reason is: the brine in the brine tank needs to pass through a pipe to enter the glass nozzle, and 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 detected, accurate data cannot be obtained, 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 filtering section is coaxial with the compression section, the filter is installed inside the filtering section, an L-tube is installed above the filter, and the L-tube is made of a rigid heat-insulating material, a tube groove is opened on the right wall of the salt water tank, and the tube groove passes through the upper surface of the right wall of the salt water tank, a card plate is provided on the right side of the tank cover, the card plate is inserted into the tube groove, and the right end of the L-tube is located between the card 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 to the outside of the brine tank through the L-tube with a fixed shape, and then connected to the glass nozzle through a rubber hose. On the one hand, the length of the L-tube soaked by the brine in the brine tank is fixed, and then the time for the brine to wet the pipeline 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 middle of the floating plate can also cooperate with the support rod to form a more stable positioning effect for the floating plate, so that the floating plate can slide up and down more smoothly, thereby ensuring the reliability of the equipment operation, and further, in order to keep the brine in the L-tube warm to ensure the solubility of the salt in the brine, the L-tube is made of insulating material.

[0019] In the prior art, there are usually two ways to adjust the spray volume. One is to adjust the conical disperser. The higher the position of the conical disperser, the greater the amount of fog. The other is to adjust the jet pressure of the glass nozzle. However, this method is not commonly used because the change of air pressure will also cause changes in other data such as gas temperature, which will not only affect the accuracy of the test, but also increase the cost of the test. However, these two methods have common problems. Whether it is adjusting the conical disperser or adjusting the air pressure, it is usually manually operated. Then this adjustment must be limited in number. However, the spray volume in the salt spray test is a data that is difficult to detect (the detection cycle is long). It is difficult to ensure the accuracy of the spray volume compensation only through limited adjustments.

[0020] Preferably, the support rod comprises 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 a plurality of outer rods, and the length of the inner rods is greater than the length of the outer rods, the lower ends of the inner rods are connected to the floating plates, the conical disperser is provided with blocking holes, 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 holes at the bottom;

[0021] In the above scheme, firstly, the inner rod (connected to the float) is lowered as the brine level in the brine tank drops, and then the raised conical disperser is continuously lowered, so that the salt mist compensation amount is gradually reduced, thereby forming a complementary relationship with the gradual wetting of the L-tube and the rubber hose connecting the L-tube and the glass nozzle to form accurate compensation; secondly, the gradually decreasing liquid level in the brine tank will also enhance the above 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 provided with an inner screw sleeve and an outer screw sleeve, the inner screw sleeve and the outer screw sleeve are respectively threadedly connected with 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 provided 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 conical hole with the small diameter end facing downward, and the inner screw sleeve, the inner rod and the floating plate are hollow and connected inside;

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

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

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

[0029] In the above scheme, the drainage holes are blocked and opened by the top rod, so that the settled brine in the sump 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 scheme, the brine level is raised by the one-way valve and the annular wall, thereby increasing the pressure in the filtration section, thereby ensuring the discharge speed and amount of 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, and the pit connects 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, it can ensure that 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 is 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, pits are 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 scheme, 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 liquid 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 floating plate to adjust the height of the conical disperser by changing the liquid level in the salt water tank, so that when the spray device just works, the conical disperser is at a higher position to compensate for the spray volume in the initial stage of the test, and the conical disperser is lowered as the salt water level decreases, so that the compensation force changes, and the change forms a complementary relationship with the gradually increasing actual spray volume, thereby ensuring the accuracy of the spray volume compensation, and the floating plate will raise the salt water level in the salt water tank through its own draft, so that more salt water is discharged at the end of the test, thereby reducing the residual amount of salt water in the salt water tank, thereby reducing the waste of salt water.

[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 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 decreases along with the brine liquid level (the compensation effect is weakened), thereby forming a complementary relationship to ensure the accuracy of the compensation, and 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 and provides blocking holes 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. The conical structure of the conical disperser is utilized to provide 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 floating plate at a set time, thereby further increasing the draft of the floating plate, so that the floating plate can increase the filling space of the compression section without affecting the brine content in the brine tank during the spray stabilization period, 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 2It is a schematic diagram of the internal equiaxial structure of the present invention;

[0042] Figure 3 For the present invention Figure 1 The enlarged schematic diagram of part A in the middle;

[0043] Figure 4 For the present invention Figure 2 The enlarged schematic diagram of part B in the middle;

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

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

[0046] Figure 7 It is a schematic diagram of the falling state of the precipitation 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 tank; 13, waterway; 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 tank; 73, drainage hole; 8, support rod; 81, outer rod; 811, outer screw sleeve; 82, inner rod; 821, inner screw sleeve; 822, top rod; 9, floating 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

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

[0051] A spray device for salt spray test comprises 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 enters the salt water tank normally 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 salt water tank 1, the spray tower 4, the tank cover 3 and the salt water 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 salt water, 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 salt water tank 1, and is sunk on the bottom surface of the salt water 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, due to the rapid flow of the surrounding gas, the pressure at the outlet of the straight pipe will be at a lower level, thereby forming a negative pressure compared to the bottom of the salt water tank 1, so that the salt water in the salt water 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, 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. 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 sagging 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 salt water tank 1, and the pressure discharge chamber 11 is located directly below the floating plate 9.

[0052] The water inlet float valve 10 guides the 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, and the float plate 9 fills the pressure discharge cavity 11 at the end of the salt spray test.

[0053] As an embodiment of the present invention, refer to Figure 2The 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 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 when conditions permit. An annular wall 14 is arranged above the compression section 111. 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 arranged inside the lower wall of the brine tank 1. 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 salt water outside the annular wall 14 is completely discharged to the compression section 111, the salt water level begins to move downward in the compression section 111. At this time, the upper end of the top rod 822 just enters the drainage hole 73, so that the settled salt water in the water collecting tank 72 falls into the floating plate 9, increasing the draft of the floating plate 9, and then the liquid level in the compression section 111 is lifted to the annular wall 14 through the closure of the one-way valve 15, so as to further increase the pressure in the filtering section 112 and ensure the discharge speed and discharge amount of the salt water in the compression section 111; the draft of the floating plate 9 filled with salt water is greater than the height of the compression section 111, and a pit 91 is set on the lower end surface of the floating plate 9, and the pit 91 connects the compression section 111 and the filtering section 112. The draft of the floating plate 9 is designed by regulating the materials of the floating plate 9 and the support rod 8, and the bottom area of ​​the floating plate 9;

[0054] The salt water tank 1 is injection molded with PVC material. During the injection molding, 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, and its highest point should be located below the liquid level controlled by the water inlet float valve 10, so as to avoid the accumulation of salt water outside the ring wall 14 when the salt water is first introduced, resulting in the liquid level in the ring wall 14 not rising to the set height when the water inlet float valve 10 stops introducing water (in order to reduce the residual salt water at the end of the test, the diameter of the water channel 13 is small, so the speed of draining the salt water into the compression section 111 through the water channel 13 is slow); after the salt water tank 1 is formed, holes are punched on its lower wall surface 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 port of the water channel 13. For the convenience and tightness of the installation, the port of the water channel 13 can be tapped in advance, and the raw tape is wrapped around the connection of the one-way valve 15, and then connected with the thread of the port of the water channel 13.

[0055] As an embodiment of the present invention, refer to Figures 1 to 3, the 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 upward, an L-tube 61 is installed above the filter 6, and the L-tube 61 is made of a rigid insulation material, such as a PPR material, a pipe groove 12 is opened on the right wall of the brine tank 1, and the pipe groove 12 is set as a long waist semicircular structure, and the pipe groove 12 passes through the upper surface of the right wall of the brine tank 1, and a clamping plate 31 is provided on the right side of the tank cover 3, and an arc groove for clamping the L-tube 61 is set below the clamping plate 31, and 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 precipitated brine inside the floating 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 floating plate 9, and then tilt or invert the tank cover 3 to discharge the precipitated brine inside the floating 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 to reset.

[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 an annular array above the slot cover 3. A plurality of inner rods 82 are respectively inserted into the plurality of outer rods 81. The length of the inner rod 82 is greater than that 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, so that the floating plate 9 can 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 an annular array on the circumference of the conical disperser 7. , and the blocking hole 71 is set as a two-stage 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, the filter 6 is first placed in the filter tank, and then the L tube 61 is passed through the middle of the floating plate 9, and then the floating plate 9 is placed in the salt water tank 1 (when placing, the L tube 61 is aligned with the tube groove 12), and then the L tube 61 is pressed to make the L tube 61 communicate with the filter 6, and finally the outer rod 81 is aligned with the inner rod 82, so that the tank cover 3 falls on the salt water tank 1;

[0057] The first water inflow into the brine tank in the salt spray test is controlled by the water inlet float valve 10, so that the brine liquid level in the brine tank 1 is at a higher position, and then the float plate 9 rises to the set height, so that the conical disperser 7 is lifted up by the inner rod 82 to increase the spray volume in the initial stage of the salt spray test, and the water inlet float valve 10 loses the water inflow function after the first water inflow is completed. As the brine in the brine tank 1 is continuously sprayed out by the glass nozzle 5, the brine liquid level gradually decreases, and then the height of the float plate 9 continues to decrease, thereby driving the conical disperser 7 to gradually decrease, so that the compensation for the spray volume is gradually reduced, which just fits the nature of the initial spray volume gradually increasing, thus forming a complementary relationship; and 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 brine to be discharged 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 is also gradually weakened. 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 the normal level, 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 screw sleeve 821 and an outer screw sleeve 811, which are threadedly connected to the inner rod 82 and the outer rod 81 respectively. The upper ends of the inner circle of the inner rod 82 and the outer circle of the outer rod 81 are both provided with threads, and the inner screw sleeve 821 and the outer screw sleeve 811 are respectively provided with external threads and internal threads matching 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 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.

[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 upper end surface with a larger area formed by the conical structure of the conical disperser 7 is used to collect the settled salt water in the salt spray test box, 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 rod 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, so as to reduce the volume of salt water below the lowest water level of the salt water discharge, thereby reducing the 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 the manufacturing process 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 the installation and adjustment, and on the other hand, the excessive draft of the float plate 9 will reduce the content of the salt water between the water inlet float valve 10 and the water control float valve 2, thereby causing insufficient salt water during the spray 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 set to a through hole. The push rod 822 passes through the drainage hole 73, and a sealing ring is installed on the drainage hole 73, so as to ensure that the settled salt water in the water collection tank 72 will not fall into 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 flow immediately from the drainage hole 73 (and thus will not increase the draft of the float plate 9), 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 problem of temperature influence. The top rod 822 is driven by the float plate 9 and drops with the brine level. When it drops to the set position, the upper end of the top rod 822 enters the drainage hole 73, and then guides the precipitated 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 an electromagnetic valve 17, and the electromagnetic valve 17 is a two-position three-way type; the brine liquid level in the brine tank is controlled by the electromagnetic valve 17. At the beginning of the test, the electromagnetic valve 17 is energized to allow water to enter the liquid pipe 16 connected to the water inlet float valve 10, thereby completing the first water inlet. After that, the electromagnetic valve 17 is de-energized to allow water to enter the liquid pipe 16 connected to the water control float valve 2. The electromagnetic valve 17 is arranged in the control area outside the salt spray test box to avoid corrosion and damage to the electromagnetic 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 initial stage of the test to compensate for the initial spray volume, and 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 at Figure 5 In the position shown, a water inlet float valve 10 is added inside the salt water tank 1. The water inlet float valve 10 has the same principle as the water control float valve 2: when the valve body sags, the valve port is opened, and the salt water from the outside enters the salt water tank 1. As the liquid level of the salt water 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 salt water tank 1 to be stable at a certain position; the present invention adopts a two-position three-way solenoid valve 17 to control the salt water inlet state of the water inlet float valve 10 and the water control float valve 2. When the solenoid valve 17 is energized, the water inlet float valve 1 0, and water flows into the salt water tank 1. When the salt water 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, and the liquid pipe 16 of the water inlet float valve 10 is blocked, so that the water inlet float valve 10 loses the function of stabilizing the liquid level, so that the salt water level continues to drop as the glass nozzle 5 sprays. It takes a period of time for the salt water level to drop to the liquid level controlled by the water control float valve 2, and this period of time is the spray compensation period.

[0065] In order to accurately compensate 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 leads to the length of the spray compensation period being uncontrollable. Therefore, the present invention adds a section of 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 connected to the glass nozzle 5 through a rubber hose of a fixed length, so that the length 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 floating plate 9, so that the rising and falling processes of the floating plate 9 are smooth.

[0066] After the spray compensation period, the spray device enters a relatively long 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 the figure, and the water collecting tank 72 on the conical disperser 7 collects a large amount of precipitated salt water during the spray stabilization period. If the precipitated salt water is directly discharged into the floating plate 9, the gradually increasing draft of the floating plate 9 will reduce the salt water content in the salt water tank 1, thereby accelerating the circulation of the salt water in the salt water tank 1, thereby causing the salt water temperature to be insufficient, thereby inducing the problem of insufficient salt solubility. Therefore, the present invention is conceived as follows: first, the collected precipitated salt water is gathered in the water collecting tank 72, and at the end of the salt spray test, the salt water in the salt water tank 1 is no longer fed with salt water (that is, there is no salt water). When the solubility problem caused by temperature occurs, the precipitated salt water 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 supports the blocking hole 71, so that the conical disperser 7 is separated from the support of the inner rod 82 and stabilized at 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 will block the drainage hole 73 of the conical disperser 7, thereby preventing the precipitated salt water 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 salt water into the salt water tank 1, so the liquid level in the salt water tank 1 gradually drops. When it drops to the lowest water level of salt water discharge, the residual salt water can no longer be sprayed out through the glass nozzle 5. Considering the production and processing costs, the residual salt water should be as little as possible. Therefore, the present invention first opens a compression section 111 inside the salt water tank 1, and sets the lowest water level of salt water discharge inside the compression section 111, so as to reduce the volume of residual salt water 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 completely discharged. 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 top rod 822 will be inserted into the drainage hole 73 ( Figure 7 As shown in the state, the precipitated salt water in the water collecting tank 72 falls and enters the interior of the floating plate 9. After the draft of the floating plate 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, so that more salt water is discharged. After the interior of the floating plate 9 is filled with salt water, its draft is greater than the height of the compression section 111, that is, it is ensured that when the salt water in the compression section 111 is located below the annular wall 14, the bottom surface of the floating plate 9 must contact the bottom surface of the compression section 111 ( Figure 8 As shown in the state, the floating plate 9 is made to completely fill the compression section 111, so that at the end of the test, the brine will only remain in the gap between the floating plate 9 and the compression section 111, and the liquid level of the remaining brine is below the lowest water level line of the brine discharge; in addition, in order to allow the brine to continue to be discharged after the bottom surface of the floating plate 9 contacts the bottom surface of the compression section 111, a pit 91 is arranged on the bottom surface of the floating plate 9.

[0069] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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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