Automatic liquid supplementing device of sample cylinder for testing metal corrosivity and mounting method

Abstract

The invention belongs to the technical field of dangerous chemical identification and classification and safety management, and particularly discloses an automatic liquid supplementing device of a sample cylinder for testing metal corrosivity and an installation method. The automatic liquid supplementing device comprises a liquid supplementing bottle, a liquid guide pipe, a hollow floating ball, a piston part and a connecting rod mechanism. A flow control part used for containing the piston part is arranged on the liquid guide pipe, the pipe inner diameter of the flow control part is larger than that of the liquid guide pipe, the inner pipe wall of the lower end of the flow control part is sunken downwards to form a lower groove, and the lower groove is matched with the bottom end of the piston part. The height of the piston part is larger than the pipe inner diameter of the liquid guide pipe and smaller than the pipe inner diameter of the flow control part. The piston part comprises a piston and a first magnet embedded in the lower portion of the piston, and a second magnet is embedded in the pipe wall, corresponding to the first magnet, of the flow control part. The hollow floating ball and the piston part are connected through a Teflon rope, and the Teflon rope is erected on the connecting rod. Based on a physical working principle, automatic liquid supplementing is realized, and the accuracy of a test result is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of identification, classification and safety management of hazardous chemicals, and in particular relates to an automatic liquid replenishing device for a sample cylinder used for testing metal corrosion and an installation method. Background Art

[0002] The test of corrosive substances to metals in the field of identification, classification and safety management of hazardous chemicals is mainly carried out according to the United Nations Manual of Tests and Criteria 37.4 Test Methods for Determining Corrosiveness to Metals. Chapter 37.4.2 of the United Nations Manual of Tests and Criteria 37.4 Test Methods for Determining Corrosiveness to Metals and Chapter 6.2 of GB / T 21621-2008 Test Methods for Corrosiveness to Metals emphasize that in order to ensure that the metal sample reacts completely in the liquid to be tested, the minimum volume of the liquid to be tested is 1.5L. The test should be carried out for at least 7 days, unless the mass loss of the metal sheet reaches 13.5% or the pitting depth reaches 120 microns within 7 days. Failure to replace the solvent during the long test period will affect the test results. In order to obtain correct results and avoid repeated tests, new solvents should be added during the test and the amount of solvent should be large enough to avoid significant changes in corrosiveness during the test.

[0003] However, different mixed solvents have different volatilization rates at the test temperature of 55°C, and there is no way to accurately determine the time for refilling. The metal corrosion sample cylinder provided in the "United Nations Manual of Tests and Criteria 37.4 Test Methods for Determining Corrosion to Metals" lacks a convenient refilling function. During the 7-day test, the test personnel need to observe the liquid level of the sample every day to ensure that there is enough sample in the cylinder to support the reaction. Since some water bath thermostats are made of stainless steel, the test personnel are required to take out the entire sample cylinder containing 1.5L of sample for observation, and the test process is time-consuming and laborious.

[0004] If the test personnel fail to check the liquid level every day, the metal sheet may be suspended in the air due to the volatilization of the sample, and the true corrosiveness of the test sample cannot be understood. If the position of the metal sheet is only adjusted regularly, there may not be enough solvent in the cylinder to support the reaction, resulting in a negative result. The 7-day test cycle is already too long for some customers who submit samples for testing. If the results are unreliable due to the drop in the liquid level or insufficient solvent, it is difficult for customers to accept the need to re-submit samples for testing. Summary of the invention

[0005] One object of the present invention is to provide an automatic liquid replenishing device for a sample cylinder for testing metal corrosion, which effectively solves the problem that the existing sample cylinder for testing metal corrosion requires test personnel to check the liquid level of the sample every day.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The invention discloses an automatic liquid replenishing device for a sample cylinder used for testing metal corrosion, comprising a liquid replenishing bottle, a liquid guiding tube, a hollow floating ball, a piston part and a connecting rod mechanism.

[0008] The top of the infusion bottle is provided with a liquid filling port, the bottom of the infusion bottle is provided with a liquid outlet, the liquid filling port is covered with a bottle cap, the bottle cap is provided with a first through hole, and the liquid outlet is connected to the first end of the liquid guide tube.

[0009] A portion of the liquid guiding tube close to the second end of the liquid guiding tube is provided with a flow control portion for accommodating the piston portion, the inner diameter of the flow control portion is larger than the inner diameter of the liquid guiding tubes located upstream and downstream of the flow control portion, the upper end of the flow control portion is open, and the inner tube wall of the lower end of the flow control portion is recessed downward to form a lower groove, and the lower groove is adapted to the bottom end of the piston portion.

[0010] The piston part is arranged in the flow control part, and the height of the piston part is greater than the inner diameter of the liquid guide tube located upstream and downstream of the flow control part and is smaller than the inner diameter of the flow control part.

[0011] The piston part includes a piston made of Teflon and a first magnet embedded in the lower part of the piston, a second magnet is embedded in the tube wall of the flow control part corresponding to the first magnet, and the magnetic poles of the first magnet and the second magnet are different.

[0012] The connecting rod mechanism includes a connecting rod and an annular cylinder. The inner diameter of the annular cylinder is larger than the width of the connecting rod. The annular cylinder is sleeved on the connecting rod. The connecting rod and the annular cylinder are rotatably connected via a long connecting shaft. Both ends of the connecting rod are recessed downward to form a connecting rod groove. A short connecting shaft is rotatably connected between the front side wall and the rear side wall of the connecting rod groove. The center of the connecting rod is hollowed out from the connecting rod groove to the connection between the connecting rod and the long connecting shaft.

[0013] A first hanging ring is arranged on the hollow floating ball, a second hanging ring is arranged on the top of the piston part, a Teflon rope is connected between the first hanging ring and the second hanging ring, and the Teflon rope passes through the circular cylinder and is mounted on the connecting rod.

[0014] Furthermore, an upper cover is lockably connected to the upper opening of the flow control portion, and a second through hole for the Teflon rope to pass through is provided on the upper cover.

[0015] Furthermore, the catheter is L-shaped.

[0016] Furthermore, the length of the connecting rod is greater than the height of the annular cylinder, and the annular cylinder is sleeved on the middle section of the connecting rod.

[0017] Furthermore, the bottom of the fluid infusion bottle is in a gradually narrowing conical shape, and the liquid outlet is threadedly connected to the first end of the liquid guiding tube.

[0018] Furthermore, the catheter, hollow float, connecting rod, annular cylinder, long connecting shaft and short connecting shaft are all made of Teflon material, and the fluid infusion bottle is made of glass or Teflon material.

[0019] Another object of the present invention is to provide an installation method for an automatic liquid replenishing device of a sample cylinder for testing metal corrosion, which effectively solves the problem that the existing sample cylinder for testing metal corrosion requires test personnel to check the liquid level of the sample every day.

[0020] A method for installing the automatic liquid replenishing device of the sample cylinder for testing metal corrosion according to the above embodiment comprises the following steps:

[0021] S1. An upper through hole and a lower through hole are provided on the side wall of the sample cylinder. The upper through hole is located directly above the lower through hole, and the lower through hole is located above the 1.5L test liquid level in the sample cylinder.

[0022] S2. The rehydration bottle is connected to the sample cylinder via a fixed bracket, wherein the fixed bracket comprises a straight-line connecting frame, an open circular ring at the left end of the connecting frame, and a closed circular ring at the right end of the connecting frame, and the closed circular ring is sleeved on the sample cylinder.

[0023] S3, inserting the circular cylinder into the upper through hole, with the left and right ends of the circular cylinder both located outside the upper through hole, and glass glue filled between the circular cylinder and the hole wall of the upper through hole.

[0024] S4. The second end of the liquid guiding tube is provided with an external thread. After the second end of the liquid guiding tube passes through the lower through hole, the liquid guiding tube and the sample cylinder are screwed and fixed by a nut matched with the external thread. A third through hole for allowing the liquid in the liquid guiding tube to flow into the sample cylinder is provided at a position on the nut corresponding to the tube mouth of the liquid guiding tube.

[0025] S5. The piston part is arranged in the flow control part, and the hollow float floats on the liquid surface of the sample cylinder. One end of the Teflon rope is connected to the first hanging ring of the hollow float, and the other end of the Teflon rope passes through the circular cylinder and is connected to the second hanging ring of the piston part. The length of the Teflon rope is controlled so that when the solvent in the sample cylinder is 1.5L, the bottom end of the piston part is located in the lower groove and abuts against the bottom wall of the lower groove, and the hollow float floats on the liquid surface of the sample cylinder. The mass of the hollow float is greater than the sum of the attraction of the first magnet and the second magnet plus the mass of the piston part.

[0026] S6. The open circular ring is placed on the fluid infusion bottle, and the fluid outlet of the fluid infusion bottle is connected and fixed to the first end of the fluid guide tube.

[0027] Furthermore, the inner diameter of the closed circular ring is slightly larger than the outer diameter of the sample cylinder, the inner diameter of the open circular ring is slightly larger than the outer diameter of the rehydration bottle, and the connection position between the closed circular ring and the sample cylinder is located above the upper through hole.

[0028] Furthermore, the fixing bracket and the nut are both made of Teflon.

[0029] Furthermore, a limiting block is provided at a position on the liquid guiding tube that contacts the outer wall of the sample cylinder.

[0030] The beneficial technical effects of the present invention are:

[0031] (1) The present invention utilizes a hollow float linked piston part (equivalent to a magnetic valve) for automatic fluid replenishment, thereby avoiding changes in corrosiveness caused by excessive solvent evaporation due to untimely inspection by test personnel, ensuring the accuracy of metal corrosion test results and reducing the time and labor costs of testing and inspection institutions.

[0032] (2) The design of the present invention is entirely based on physical principles, without any electrical devices, thus avoiding hidden dangers of electricity use, and is convenient for inspection and maintenance, thus having great advantages in terms of safety in use.

[0033] (3) The present invention can be directly installed by only opening two through holes on the existing sample cylinder, without the need to purchase an adapter container separately. This is conducive to achieving automatic liquid replenishment when unattended while maintaining the existing functions, saving time and labor costs.

[0034] (4) Most of the accessories of the present invention are made of Teflon material, which has good stability, durability and corrosion resistance, and does not need to be replaced frequently. It has broad application prospects in the field of testing substances that are corrosive to metals and in scientific research institutions that study the corrosiveness of liquids.

[0035] (5) The rehydration bottle of the present invention can be made of Teflon or transparent glass. Teflon is opaque but has strong corrosion resistance, and the liquid level can be opened to determine whether to refill the rehydration bottle with solvent. The transparent glass material has weak corrosion resistance, but it can be directly observed to determine whether to refill the rehydration bottle with solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to clearly illustrate the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the combined state of the automatic liquid replenishing device and the sample cylinder of the present invention, in which the piston part is in a completely cut-off liquid replenishing state;

[0038] Figure 2 yes Figure 1 Schematic diagram of fluid refilling status;

[0039] Figure 3 yes Figure 1 A cross-sectional view of the combined state of the central liquid guide tube and the piston part;

[0040] Figure 4 yes Figure 1 A cross-sectional view of the middle rehydration bottle;

[0041] Figure 5 yes Figure 1 Front view of the middle link mechanism;

[0042] Figure 6 yes Figure 1 Top view of the middle linkage mechanism;

[0043] Figure 7 yes Figure 1 Top view of the fixing bracket. DETAILED DESCRIPTION

[0044] The present invention is mainly used for testing substances corrosive to metals in the field of identification, classification and safety management of hazardous chemicals. The test is mainly used to determine the packaging and transportation methods of some liquid chemicals containing corrosive substances and the specific categories of hazardous chemicals.

[0045] At present, all the testing and inspection institutions whose business includes cargo transportation identification or classification identification of hazardous chemicals have carried out tests on substances that are corrosive to metals. At the same time, the test cycle is relatively long, and the test method is based on the "United Nations Manual of Tests and Criteria 37.4 Test Methods for Determining Corrosiveness to Metals" and GB / T 21621-2008 "Test Methods for Corrosion of Hazardous Materials to Metals". The standard method requires that new solvents should be added during the test to prevent corrosive changes caused by solvent evaporation, but most of the metal corrosion test devices currently used in the industry are only composed of constant temperature water devices and cooling circulation pipes, which require manual rehydration, and the whole process is time-consuming and laborious.

[0046] There are some patents that provide solutions, but most of them are based on some electronic sensors. During testing, the electronic sensors themselves may come into contact with corrosive substances, increasing the safety risks of electricity use.

[0047] The present invention can realize automatic liquid replenishment during the test process, avoiding changes in corrosiveness caused by excessive solvent volatilization due to untimely inspection by test personnel, ensuring the accuracy of metal corrosion test results and reducing the time cost and labor cost of the testing and inspection agency. At the same time, the design of the present invention is entirely based on physical principles, without any electrical devices, avoiding hidden dangers of electricity use. The present invention can be directly installed on the sample cylinder without the need to purchase an adapter container separately, bringing convenience to the hazardous chemical testing and inspection industry, and most of the accessories of the present invention are made of Teflon material, which has good stability, durability and corrosion resistance, and does not need to be frequently replaced. It has broad application prospects in the field of testing substances corrosive to metals and in scientific research institutions studying liquid corrosiveness.

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings. The drawings of the present invention are for illustrative purposes only. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. The terms "upper", "lower", "top", "bottom", "side", "outer", "horizontal", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those skilled in the art, some well-known structures in the drawings and their descriptions may be omitted, and therefore, cannot be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0050] Example 1

[0051] like Figure 1-Figure 4 As shown, an automatic liquid replenishing device for a sample cylinder for testing metal corrosion comprises a liquid replenishing bottle 1, an L-shaped liquid guiding tube 2, a hollow floating ball 3, a piston part 4 and a connecting rod mechanism.

[0052] Combination Figure 4 The top of the infusion bottle 1 is provided with a liquid inlet 101, the bottom of the infusion bottle 1 is provided with a liquid outlet 102, the liquid inlet 101 is covered with a bottle cap 103, the bottle cap 103 is provided with a first through hole 104, the first through hole 104 can prevent negative pressure and prevent slightly viscous solvent from being unable to flow. The liquid outlet 102 is connected to the first end 21 of the liquid guide tube 2.

[0053] In some embodiments, the bottom of the fluid infusion bottle 1 is in a gradually narrowing conical shape, and the fluid outlet 102 is threadedly connected to the first end 21 of the fluid conduit 2 .

[0054] Combination Figure 3 The portion of the liquid guiding tube 2 close to the second end 22 of the liquid guiding tube 2 is provided with a flow control portion 23 for accommodating the piston portion 4, the inner diameter of the flow control portion 23 is larger than the inner diameter of the liquid guiding tube 2 located upstream and downstream of the flow control portion 23, the upper end of the flow control portion 23 is open, and the inner tube wall of the lower end of the flow control portion 23 is recessed downward to form a lower groove 231, and the lower groove 231 is adapted to the bottom end of the piston portion 4.

[0055] The piston part 4 is disposed in the flow control part 23 , and the height of the piston part 4 is greater than the inner diameter of the liquid guiding tube 2 located upstream and downstream of the flow control part 23 and smaller than the inner diameter of the flow control part 23 .

[0056] The piston part 4 includes a piston 41 made of Teflon and a first magnet 5 embedded in the lower part of the piston 41. A second magnet 6 is embedded in the tube wall of the flow control part 23 corresponding to the first magnet 5. The magnetic poles of the first magnet 5 and the second magnet 6 are different. The mutual attraction between the first magnet 5 and the second magnet 6 can be adjusted by adjusting the size of the first magnet 5 and the second magnet 6 and the distance between the two magnets.

[0057] The lower groove 231 can embed the piston part 4, so that when the first magnet 5 in the piston part 4 is attracted by the second magnet 6 in the tube wall of the flow control part 23, the piston part 4 can completely cut off the fluid replenishment to prevent excessive fluid replenishment caused by leakage.

[0058] In some embodiments, in order to facilitate the installation of the piston part 4 and limit the moving space of the piston part 4, the moving space of the piston part 4 is limited to prevent the hollow float 3 from falling too much, causing the piston part 4 to be pulled out of the flow control part 23, and the flow interception function cannot be continued. An upper cover 232 is provided at the upper end opening of the flow control part 23, and the upper cover 232 is locked with the tube wall of the flow control part 23, or one side of the upper cover 232 is connected to the tube wall of the flow control part 23 through a hinge, and the upper cover is opened and closed by the hinge, so as to open or close the flow control part 23. The upper cover 232 is provided with a second through hole 233 for the Teflon rope 18 to pass through.

[0059] Combination Figure 5 and Figure 6 The connecting rod mechanism includes a connecting rod 7 and a circular cylinder 8, the inner diameter of the circular cylinder 8 is greater than the width of the connecting rod 7, the length of the connecting rod 7 is greater than the height of the circular cylinder 8, and the circular cylinder 8 is sleeved on the connecting rod 7. In some embodiments, the circular cylinder 8 is sleeved on the middle section of the connecting rod 7.

[0060] The connecting rod 7 and the annular cylinder 8 are rotatably connected via a long connecting shaft 9, which is beneficial for the automatic angle adjustment of the connecting rod 7. In some embodiments, a pair of through holes are opened in the middle of the annular cylinder 8, and a hole is opened on the connecting rod 7, the annular cylinder 8 is sleeved on the connecting rod 7, and the opening on the connecting rod 7 is aligned with the opening on the annular cylinder 8, and the long connecting shaft 9 is passed through the opening, so that the connecting rod 7 and the annular cylinder 8 are rotatably connected.

[0061] Both ends of the connecting rod 7 are recessed downward to form a connecting rod groove, and a short connecting shaft 10 is rotatably connected between the front side wall and the rear side wall of the connecting rod groove. The center of the connecting rod 7 from the connecting rod groove to the connection between the connecting rod 7 and the long connecting shaft 9 is hollowed out.

[0062] The hollow float 3 is provided with a first hanging ring 31 , the top of the piston part 4 is provided with a second hanging ring 42 , a Teflon rope 18 is connected between the first hanging ring 31 and the second hanging ring 42 , and the Teflon rope 18 passes through the annular cylinder 8 and is mounted on the connecting rod 7 .

[0063] The Teflon rope 18 contacts the short connecting shaft 10 and passes through the short connecting shaft 10. Since the short connecting shaft 10 is rotatably connected to the connecting rod 7, the friction between the Teflon rope 18 and the short connecting shaft 10 can be reduced, making the hollow float 3 and the piston part 4 move more smoothly during the liquid level change process.

[0064] The Teflon rope 18 can be prevented from falling off the connecting rod 7 by the groove design at both ends of the connecting rod 7 and the central hollow design of the connecting rod 7 from the connecting rod groove to the connection between the connecting rod 7 and the long connecting shaft 9.

[0065] In some embodiments, the catheter 2, the hollow float 3, the connecting rod 7, the annular cylinder 8, the long connecting shaft 9 and the short connecting shaft 10 are all made of Teflon. The fluid infusion bottle 1 is made of glass or Teflon. When the solvent in the fluid infusion bottle 1 is a highly corrosive substance such as alkaline or hydrofluoric acid, Teflon is used; when the solvent in the fluid infusion bottle 1 is other types, glass can be used directly.

[0066] Example 2

[0067] A method for installing an automatic liquid replenishing device for a sample cylinder for testing metal corrosion as described in Example 1 comprises the following steps:

[0068] S1. An upper through hole 12 and a lower through hole 13 are provided on the side wall of the sample cylinder 11. The upper through hole 12 is located directly above the lower through hole 13, and the lower through hole 13 is located above the 1.5L test liquid level of the sample cylinder. It should be noted that according to the requirements of the United Nations Manual of Tests and Criteria 37.4 Test Methods for Determining Corrosion to Metals and GB / T 21621-2008 Test Methods for Corrosion of Hazardous Substances to Metals, during the test of metal corrosion, the liquid level in the sample cylinder 11 must be maintained at 1.5L.

[0069] S2, the rehydration bottle 1 is connected to the sample cylinder 11 by a fixed bracket 14, combined with Figure 1 and Figure 7 The fixing bracket 14 includes a straight-line connecting frame 141 , an open ring 142 located at the left end of the connecting frame 141 , and a closed ring 143 located at the right end of the connecting frame 141 . The closed ring 143 is sleeved on the sample cylinder 11 .

[0070] In some embodiments, the inner diameter of the closed circular ring 143 is slightly larger than the outer diameter of the sample cylinder 11 , and the connection position between the closed circular ring 143 and the sample cylinder 11 is located above the upper through hole 12 .

[0071] In some embodiments, the fixing bracket 14 is made of Teflon.

[0072] S3, inserting the annular cylinder 8 into the upper through hole 12, with the left and right ends of the annular cylinder 8 both located outside the upper through hole 12, and glass glue filled between the annular cylinder 8 and the hole wall of the upper through hole 12.

[0073] Since both left and right ends of the annular cylinder 8 are located outside the upper through hole 12 , that is, the height of the annular cylinder 8 is greater than the side wall thickness of the sample cylinder 11 , the closed ring 143 can be limited to prevent the closed ring 143 from sliding down.

[0074] S4. The second end 22 of the liquid guiding tube 2 is provided with an external thread. After the second end 22 of the liquid guiding tube 2 passes through the lower through hole 13, the liquid guiding tube 2 and the sample cylinder 11 are screwed and fixed by a nut 15 adapted to the external thread. A third through hole 16 for allowing the liquid in the liquid guiding tube 2 to flow into the sample cylinder 11 is provided at a position corresponding to the tube mouth of the liquid guiding tube 2 on the nut 15.

[0075] In some embodiments, the nut 15 is made of Teflon material. Since Teflon material has a certain toughness, the nut 15 made of Teflon material can fit well with the curved surface.

[0076] In some embodiments, a stopper 17 is provided at a position on the liquid guiding tube 2 that contacts the outer wall of the sample cylinder 11. By providing the stopper 17, the liquid guiding tube 2 can be inserted into the lower through hole 13 to facilitate insertion into place.

[0077] S5. Place the piston part 4 in the flow control part 23, the hollow float 3 floats on the liquid surface of the sample cylinder 11, connect one end of the Teflon rope 18 to the first hanging ring 31 of the hollow float 3, and the other end of the Teflon rope 18 passes through the annular cylinder 8 and is connected to the second hanging ring 42 of the piston part 4. The length of the Teflon rope 18 is controlled so that when the solvent in the sample cylinder 11 is 1.5L, the bottom end of the piston part 4 is located in the lower groove 231 and abuts against the bottom wall of the lower groove 231, the hollow float 3 floats on the liquid surface of the sample cylinder 11, and the entire linkage system is just in a relaxed state.

[0078] The mass of the hollow float 3 is greater than the sum of the attraction of the first magnet 5 and the second magnet 6 plus the mass of the piston 4, ensuring that the hollow float 3 can pull up the piston 4 through the connecting rod mechanism when the liquid level drops. The mass of the hollow float 3 is designed to float on the liquid surface of most solvents, and the buoyancy of the hollow float 3 can be adjusted by adjusting the wall thickness of the hollow float 3.

[0079] S6. Finally, the open ring 142 is sleeved on the infusion bottle 1, and the liquid outlet 102 of the infusion bottle 1 is connected and fixed to the first end 21 of the catheter 2. In order to facilitate the sleeve of the open ring 142 on the infusion bottle 1, the inner diameter of the open ring 142 is designed to be slightly larger than the outer diameter of the infusion bottle 1.

[0080] The working principle of the present invention is:

[0081] Combination Figure 1 and Figure 2 , the hollow float 3 is linked to the piston part 4 (equivalent to the magnetic valve) to automatically replenish the liquid. When the solvent in the sample cylinder 11 decreases due to evaporation, the liquid level drops, which in turn causes the hollow float 3 to drop. When the hollow float 3 drops, the piston part 4 is pulled up, so that the liquid guide tube 2 is gradually opened from closed, and the solvent in the liquid replenishment bottle 1 flows into the sample cylinder 11. When the liquid level in the sample cylinder 11 rises to the initial liquid level position (that is, the solvent in the sample cylinder 11 is 1.5L), the hollow float 3 returns to the initial height, and the piston part 4 falls into the lower groove 231 due to its own weight and the magnetic attraction between the first magnet 5 and the second magnet 6, closing the liquid guide tube 2 and completely cutting off the liquid replenishment.

[0082] On the one hand, the present invention can be directly installed by only opening two through holes on the existing sample cylinder 11. Therefore, it can realize automatic liquid replenishment when unattended under the premise of maintaining the existing functions, saving time and labor costs.

[0083] On the other hand, the present invention is based on a physical working principle and does not involve electrical devices, is easy to inspect and maintain, and has better advantages in terms of safety in use.

[0084] Finally, the present invention can use a variety of materials for the rehydration bottle 1, one is an opaque but corrosion-resistant Teflon material, and the bottle cap 103 can be opened to observe the liquid level to determine whether to refill the solvent in the rehydration bottle 1; the other is a transparent glass material with weak corrosion resistance, and the solvent can be directly observed to determine whether to refill the rehydration bottle 1.

[0085] The practicality and effectiveness of the present invention will be verified below in combination with specific implementation cases and comparative cases.

[0086] Implementation Cases

[0087] Metal Corrosion Test

[0088] Test standard basis: "United Nations Manual of Tests and Criteria 37.4 Test methods for determining corrosion to metals"

[0089] Test principle: Corrosive liquids will react with metal elements that can react with them to generate salts that dissolve in the solvent. The mass of the metal sheet itself will decrease as the reaction proceeds. The corrosiveness of the test sample is judged based on whether the mass reduction of the metal sheet reaches 13.5% or the local pitting exceeds 120 microns after 7 days of testing.

[0090] Test equipment and accessories:

[0091] 1.2 constant temperature water bath devices with temperature control up to 55°C and temperature control accuracy of ±1°C;

[0092] 2.2 temperature-controlled circulating water baths;

[0093] 3.2 sample cylinders, 2 sets of automatic liquid replenishing devices, 2 fixed brackets, 2 four-mouth glass covers with stoppers and 2 reflux condensers;

[0094] 4.3 pieces of S235JR+CR (1.0037resp.St 37-2) steel sheets with a length of 50 mm, a width of 20 mm, a thickness of 2 mm and a circular hole with a diameter of 3 mm; 3 pieces of non-composite 7075-T6 aluminum sheets with a length of 50 mm, a width of 20 mm, a thickness of 2 mm and a circular hole with a diameter of 3 mm. Before the aluminum sheets are tested, the surface oxide film must be polished off with sandpaper to prevent the oxide film from affecting the test results;

[0095] 5. Teflon rope.

[0096] Test process:

[0097] Install two sets of automatic liquid replenishing devices on two sample cylinders 11 with holes, add 1.5L of test sample into the two sample cylinders 11 respectively, and observe that the hollow float 3 gradually floats up with the rise of the liquid level. After 1.5L of test sample is added, the Teflon rope 18 connecting the hollow float 3 and the piston part 4 can be adjusted from the flow control part 23, so that the piston part 4 is attracted by the second magnet 6 while the Teflon rope 18 above the floating hollow float 3 just keeps in a relaxed state.

[0098] Take a Teflon rope and divide it into 6 sections, the length of each section should be about the same as the height of the metal corrosion sample cylinder. Tie the 6 sections of rope to the holes of 3 aluminum sheets and 3 steel sheets respectively and put a label on the other end of the rope to indicate the sample number and test status.

[0099] According to the requirements of the standard "United Nations Manual of Tests and Criteria 37.4 Test Methods for Determining Corrosion to Metals", each sample cylinder tests a metal sheet of a material, and each metal sheet is placed in three test states: full immersion, half immersion, and suspension. The rope of the metal sheet in each test state is fixed by fitting the plugs of the four glass covers, and the position of the metal sheet is adjusted by rotating the four glass covers to prevent the hanging rope of the metal sheet from getting entangled with the hanging rope of the hollow float.

[0100] Place the two prepared metal corrosion sample cylinders in a constant temperature water bath respectively, add water until it is level with the liquid level in the cylinder and set the water temperature to 55°C, install the reflux condenser to the branch port just above the four glass covers, and connect the water inlet and outlet of the reflux condenser to the circulating water bath with a hose.

[0101] Finally, 500 mL of the test sample is added to the rehydration bottles 1 of the two sets of automatic rehydration devices for automatic rehydration and the bottle caps 103 are covered to slow down the volatilization of the test sample. A test sign is placed next to the equipment and marked with the tester, department, contact number, equipment status, test start time and test end time, and daily inspection personnel are informed and reminded of the test end date.

[0102] Result judgment:

[0103] Two types of corrosion must be distinguished: general corrosion and localized corrosion.

[0104] The test for uniform corrosion is to use the mass loss of the most corroded metal sheet in the case of uniform corrosion. If the mass loss of the metal sheet is higher than the value listed in Table 1, the test result is considered positive:

[0105] Table 1 Upper limit of mass loss of metal sheets under different test durations

[0106] Exposure time (days) Mass loss (%) 7 13.5 14 26.5 21 39.2 28 51.2

[0107] The experimental determination of localized corrosion is when the surface is subjected to localized corrosion in addition to uniform corrosion or uneven corrosion. The maximum hole depth or the maximum thickness reduction should be added to the calculation results, or used alone to determine the degree of corrosion. If the deepest corrosion exceeds the values ​​listed in Table 2, the result is considered positive.

[0108] Table 2 Upper limit of corrosion depth of metal sheets under different test durations

[0109] Exposure time (days) Erosion depth (micrometer) 7 120 14 240 21 360 28 480

[0110] Comparative Case 1

[0111] Metal Corrosion Test of Biocides

[0112] Test sample: bactericide; composition of the test sample: ethylene glycol 45%, water 45%, di-long chain quaternary ammonium salt 10%; test sample volume: 4L.

[0113] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 12.8%, and the maximum mass loss of the aluminum sheet was 1.1%. Among them, the mass loss of the steel sheet was the most serious, which was 12.8% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0114] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0115] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet is 13.7%, and the maximum mass loss of the aluminum sheet is 1.2%. Among them, the mass loss of the steel sheet is the most serious, which is 13.7%, exceeding 13.5%. The test sample should be classified as a substance corrosive to metals.

[0116] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0117] Comparative Case 2

[0118] Metal Corrosion Test of Plug Remover

[0119] Test sample: unblocking agent; ingredients of the test sample: 30% citric acid, 3% quaternary ammonium salt cationic fluorocarbon surfactant, 67% water; test sample volume: 4L.

[0120] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 9.7%, and the maximum mass loss of the aluminum sheet was 3.4%. Among them, the mass loss of the steel sheet was the most serious, which was 9.7% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0121] During the 7-day test, the inspectors found that samples with higher water content evaporated faster at 55°C. Since the metal corrosion sample cylinder had no obvious scale lines, the inspectors could only roughly estimate the amount of liquid replenishment based on the position of the suspended hanging piece. It was difficult for the inspectors to accurately control the amount of liquid replenishment each time, resulting in a temperature fluctuation of 1.7°C for the samples in the cylinder, which exceeded the standard's accuracy requirement for temperature control (the standard requires ±1°C). The temperature affects the reaction rate, and the credibility of the test results is low.

[0122] Using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet is 10.6%, and the maximum mass loss of the aluminum sheet is 3.9%. Among them, the mass loss of the steel sheet is the most serious, which is 10.6% and does not exceed 13.5%. No obvious pitting corrosion is observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0123] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small amount of automatic refilling. At the same time, it is found through daily inspections that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0124] Comparative Case 3

[0125] Metal Corrosion Test of Crosslinking Agents

[0126] Test sample: cross-linking agent; ingredients of the test sample: 35% diisopropyl zirconate dilactate; 10% acetic acid; 55% water; test sample volume: 4L.

[0127] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 4.4%, and the maximum mass loss of the aluminum sheet was 1.2%. Among them, the mass loss of the steel sheet was the most serious, which was 4.4% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0128] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0129] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet was 5.0%, and the maximum mass loss of the aluminum sheet was 1.3%. Among them, the mass loss of the steel sheet was the most serious, which was 5.0% and did not exceed 13.5%. The test sample should not be classified as a substance that is corrosive to metals.

[0130] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0131] Comparative Case 4

[0132] Metal Corrosion Test of Corrosion Inhibitors

[0133] Test sample: corrosion inhibitor; ingredients of the test sample: 5% N-benzylalkylpyridinium chloride; 5% fatty alcohol polyoxyethylene ether; 1% propargyl alcohol; 2% cinnamaldehyde; 10% ethanol; 17% formic acid; 60% water; test sample volume: 4L.

[0134] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 3.6%, and the maximum mass loss of the aluminum sheet was 0.1%. Among them, the mass loss of the steel sheet was the most serious, which was 3.6% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0135] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0136] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet was 4.1%, and the maximum mass loss of the aluminum sheet was 0.2%. Among them, the mass loss of the steel sheet was the most serious, which was 4.1% and did not exceed 13.5%. The test sample should not be classified as a substance that is corrosive to metals.

[0137] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0138] Comparative Case 5

[0139] Metal Corrosion Test of Antiscalants

[0140] Test sample: anti-scaling agent; ingredients of the test sample: 15% sodium aminotri (methylene phosphonate); 20% sodium hydroxyethylidene diphosphonate; 15% sodium ethylenediamine tetra (methylene phosphonate); 25% sodium tripolyphosphonate; 25% water; test sample volume: 4L.

[0141] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 3.3%, and the maximum mass loss of the aluminum sheet was 0.1%. Among them, the mass loss of the steel sheet was the most serious, which was 3.3% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0142] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0143] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet was 4.1%, and the maximum mass loss of the aluminum sheet was 0.2%. Among them, the mass loss of the steel sheet was the most serious, which was 4.1% and did not exceed 13.5%. The test sample should not be classified as a substance that is corrosive to metals.

[0144] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0145] Comparative Case 6

[0146] Metal Corrosion Test of Antiscalants

[0147] Test sample: scale inhibitor; ingredients of the test sample: 25% diethylenetriamine penta (methylene phosphonic acid); 40% sodium polyacrylate; 5% methanol; 30% water; test sample volume: 4L.

[0148] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 5.7%, and the maximum mass loss of the aluminum sheet was 0.2%. Among them, the mass loss of the steel sheet was the most serious, which was 5.7% and did not exceed 13.5%, and no obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0149] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0150] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet was 6.2%, and the maximum mass loss of the aluminum sheet was 0.3%. Among them, the mass loss of the steel sheet was the most serious, which was 6.2% and did not exceed 13.5%. The test sample should not be classified as a substance that is corrosive to metals.

[0151] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0152] Comparative Case 7

[0153] Metal Corrosion Test of Diverter Agents

[0154] Test sample: diverter; ingredients of the test sample: oleamide betaine 50%; ethylene glycol 15%; water 30%; ethanol 5%; test sample volume: 4L.

[0155] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 1.0%, and the maximum mass loss of the aluminum sheet was 6.1%. Among them, the mass loss of the aluminum sheet was the most serious, which was 6.1% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as corrosive to metals.

[0156] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0157] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet was 1.1%, and the maximum mass loss of the aluminum sheet was 6.6%. Among them, the mass loss of the aluminum sheet was the most serious, which was 6.6% and did not exceed 13.5%. The test sample should not be classified as a substance that is corrosive to metals.

[0158] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0159] Comparative Case 8

[0160] Metal Corrosion Test of Pre-dehydrating Agent

[0161] Test sample: pre-dehydrating agent; composition of test sample: polyaluminium chloride 5%; water 95%; test sample volume: 4L.

[0162] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 0.6%, and the maximum mass loss of the aluminum sheet was 1.8%. Among them, the mass loss of the aluminum sheet was the most serious, which was 1.8% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as a substance corrosive to metals.

[0163] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0164] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet is 0.8%, and the maximum mass loss of the aluminum sheet is 2.3%. Among them, the mass loss of the aluminum sheet is the most serious, which is 2.3% and does not exceed 13.5%. The test sample should not be classified as a substance that is corrosive to metals.

[0165] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0166] Comparative Case 9

[0167] Metal Corrosion Test of Inverse Demulsifier

[0168] Test sample: reverse demulsifier; ingredients of the test sample: polyaluminium chloride 4%; polyacrylamide 0.2%; water 95.8%; test sample volume: 4L.

[0169] Without using the automatic liquid replenishing device of the present invention, after 7 days of testing, the maximum mass loss of the steel sheet was 0.8%, and the maximum mass loss of the aluminum sheet was 5.4%. Among them, the mass loss of the aluminum sheet was the most serious, which was 5.4% and did not exceed 13.5%. No obvious pitting was observed on both the steel sheet and the aluminum sheet. The test sample should not be classified as corrosive to metals.

[0170] During the 7-day test, the inspectors found that the liquid level dropped significantly every day, the sample evaporated quickly, and the inspectors added a large amount of liquid each time and it was difficult to accurately determine the amount of loss, resulting in frequent fluctuations in the temperature of the sample in the cylinder. Temperature has a direct impact on the reaction rate, and the test results are less credible.

[0171] After 7 days of testing using the automatic liquid replenishing device of the present invention, the maximum mass loss of the steel sheet was 1.0%, and the maximum mass loss of the aluminum sheet was 6.0%. Among them, the mass loss of the aluminum sheet was the most serious, which was 6.0% and did not exceed 13.5%. The test sample should not be classified as a substance that is corrosive to metals.

[0172] The automatic refilling device of the present invention reduces the influence of temperature on the reaction rate by frequent and small-scale automatic refilling. At the same time, through daily inspections, it is found that there is still a lot of sample remaining in the refilling bottle after 7 days of testing. There is no need for inspectors to manually refill samples throughout the whole process, and the test results are highly credible.

[0173] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium; if the connection method is not specifically stated, conventional means such as mature bolts, rivets, welding, etc. in the prior art are adopted. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0174] In the description of this specification, the description with reference to the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0175] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An automatic liquid filling device for a sample cylinder used to test metal corrosion, characterized in that: It includes a fluid infusion bottle, a fluid guide tube, a hollow float, a piston part and a connecting rod mechanism; The top of the infusion bottle is provided with a liquid filling port, the bottom of the infusion bottle is provided with a liquid outlet, the upper cover of the liquid filling port is provided with a bottle cap, the bottle cap is provided with a first through hole, and the liquid outlet is connected to the first end of the liquid guide tube; A flow control portion for accommodating the piston portion is provided on the portion of the liquid guiding tube close to the second end of the liquid guiding tube, the inner diameter of the flow control portion is larger than the inner diameter of the liquid guiding tubes located upstream and downstream of the flow control portion, the upper end of the flow control portion is open, and the inner tube wall of the lower end of the flow control portion is recessed downward to form a lower groove, and the lower groove is adapted to the bottom end of the piston portion; The piston part is arranged in the flow control part, and the height of the piston part is greater than the inner diameter of the liquid guide tube located upstream and downstream of the flow control part and smaller than the inner diameter of the flow control part; The piston part includes a piston made of Teflon and a first magnet embedded in the lower part of the piston, a second magnet is embedded in the tube wall of the flow control part corresponding to the first magnet, and the magnetic poles of the first magnet and the second magnet are different; The connecting rod mechanism comprises a connecting rod and a circular cylinder, wherein the inner diameter of the circular cylinder is greater than the width of the connecting rod, the circular cylinder is sleeved on the connecting rod, the connecting rod and the circular cylinder are rotatably connected via a long connecting shaft, both ends of the connecting rod are recessed downward to form a connecting rod groove, a short connecting shaft is rotatably connected between the front side wall and the rear side wall of the connecting rod groove, and the center of the connecting rod from the connecting rod groove to the connection between the connecting rod and the long connecting shaft is hollowed out; A first hanging ring is arranged on the hollow floating ball, a second hanging ring is arranged on the top of the piston part, a Teflon rope is connected between the first hanging ring and the second hanging ring, and the Teflon rope passes through the circular cylinder and is mounted on the connecting rod.

2. The automatic liquid replenishing device for a sample cylinder for testing metal corrosion according to claim 1, characterized in that: An upper cover is lockably connected to the upper opening of the flow control part, and a second through hole for the Teflon rope to pass through is provided on the upper cover.

3. The automatic liquid replenishing device for a sample cylinder for testing metal corrosion according to claim 2, characterized in that: The catheter is L-shaped.

4. The automatic liquid replenishing device for a sample cylinder for testing metal corrosion according to claim 3, characterized in that: The length of the connecting rod is greater than the height of the annular cylinder, and the annular cylinder is sleeved on the middle section of the connecting rod.

5. The automatic liquid replenishing device for a sample cylinder for testing metal corrosion according to claim 4, characterized in that: The bottom of the fluid infusion bottle is in a gradually narrowing conical shape, and the fluid outlet is threadedly connected to the first end of the fluid guide tube.

6. The automatic liquid replenishing device for a sample cylinder for testing metal corrosion according to claim 5, characterized in that: The catheter, the hollow float, the connecting rod, the annular cylinder, the long connecting shaft and the short connecting shaft are all made of Teflon, and the infusion bottle is made of glass or Teflon.

7. A method for installing an automatic liquid replenishing device for a sample cylinder for testing metal corrosion according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. An upper through hole and a lower through hole are provided on the side wall of the sample cylinder, wherein the upper through hole is located directly above the lower through hole, and the lower through hole is located above the 1.5L test liquid level of the sample cylinder; S2, the liquid replenishing bottle is connected to the sample cylinder by a fixed bracket, the fixed bracket includes a straight-line connecting frame, an open circular ring located at the left end of the connecting frame, and a closed circular ring located at the right end of the connecting frame, and the closed circular ring is sleeved on the sample cylinder; S3, inserting the annular cylinder into the upper through hole, with the left and right ends of the annular cylinder both located outside the upper through hole, and glass glue filled between the annular cylinder and the hole wall of the upper through hole; S4, the second end of the liquid guiding tube is provided with an external thread, and after the second end of the liquid guiding tube passes through the lower through hole, the liquid guiding tube and the sample cylinder are screwed and fixed by a nut matched with the external thread, and a third through hole for allowing the liquid in the liquid guiding tube to flow into the sample cylinder is provided at a position corresponding to the tube mouth of the liquid guiding tube on the nut; S5. The piston part is arranged in the flow control part, the hollow float floats on the liquid surface of the sample cylinder, one end of the Teflon rope is connected to the first hanging ring of the hollow float, and the other end of the Teflon rope passes through the annular cylinder and is connected to the second hanging ring of the piston part. The length of the Teflon rope is controlled so that when the solvent in the sample cylinder is 1.5L, the bottom end of the piston part is located in the lower groove and abuts against the bottom wall of the lower groove, the hollow float floats on the liquid surface of the sample cylinder, and the mass of the hollow float is greater than the sum of the attraction of the first magnet and the second magnet plus the mass of the piston part; S6. The open circular ring is placed on the fluid infusion bottle, and the fluid outlet of the fluid infusion bottle is connected and fixed to the first end of the fluid guide tube.

8. The method for installing the automatic liquid replenishing device of the sample cylinder for testing metal corrosion according to claim 7, characterized in that: The inner diameter of the closed circular ring is slightly larger than the outer diameter of the sample cylinder, the inner diameter of the open circular ring is slightly larger than the outer diameter of the rehydration bottle, and the connection position between the closed circular ring and the sample cylinder is located above the upper through hole.

9. The method for installing the automatic liquid replenishing device of the sample cylinder for testing metal corrosion according to claim 8, characterized in that: The fixing bracket and the nut are both made of Teflon.

10. The method for installing the automatic liquid replenishing device of the sample cylinder for testing metal corrosion according to claim 9, characterized in that: A limiting block is provided at a position on the liquid guiding tube that contacts the outer side wall of the sample cylinder.

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