A valve corrosion resistance detection device and detection method

Abstract

The present invention relates to the field of valve technology, and discloses a valve corrosion resistance detection device and detection method; a valve corrosion resistance detection device includes a detection cabinet, and also includes: a first corrosive liquid barrel; a liquid inlet pipe; a pressurizing component, which is used to pressurize the liquid inlet of the valve to be detected; a liquid outlet pipe; a leak detection component, which is used to detect the leakage amount per unit time at the liquid inlet of the valve to be detected when it is closed; a torque measuring component, which is used to detect the torque required to rotate the rotating rod of the valve to be detected when the valve to be detected is opened and closed; a timer. A valve corrosion resistance detection method includes the following steps: step one, perfusing corrosive liquid; step two, torque detection; step three, leakage detection; step four, looping steps two to three. The present invention detects the leakage amount through the leak detection component, can accurately judge the impact of corrosion on the opening and closing performance of the valve, reduce the number of valves used for detection, and reduce the detection cost.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a valve corrosion resistance detection device and detection method. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters of the conveying medium. Valves need to be tested during the production process, among which the corrosion resistance of the valve is an extremely important factor.

[0003] The primary function of a valve is to open and close. Internal corrosion can cause leakage and can also cause the valve stem to stick to the valve chamber. Therefore, testing for corrosion inside the valve is far more important than testing for corrosion on the outside.

[0004] However, most current corrosion resistance tests are performed using salt spray testing machines. The valve to be tested is placed in the tester, and after a period of corrosion, the corrosion level is determined by observing the valve surface. While the corrosion on the valve's exterior surface can roughly determine the internal corrosion of the valve, the valve contains various components, and the corrosion on the exterior surface can only roughly determine the corrosion level inside the valve chamber, but cannot determine the impact of corrosion on valve performance.

[0005] For example, a corrosion resistance testing device for valves with publication number CN210090272U includes a frame, a liquid storage barrel is fixedly installed on the lower surface of the inner side wall of the frame, the front and back sides of the inner side wall of the liquid storage barrel are fixedly connected to the front and back sides of the support plate respectively, the upper surface of the support plate is clamped with a bearing, and the inner side wall of the bearing is sleeved with a rotating shaft; the threaded column is rotated under the drive of the driving motor, thereby driving the barrel cover to move downward, so that the positioning plug plate is inserted into the positioning groove, and the barrel cover is connected to the liquid storage barrel, thereby isolating the inside of the liquid storage barrel from the outside world, effectively avoiding the influence of moisture in the outside air on the corrosion resistance test of the valve, and ensuring the test accuracy, and arranging trays of different heights on the hanging rod, so that the corrosion resistance performance of the valve in the test liquid at different depths can be tested, and at the same time, the corrosion resistance of different types of valves can be compared and tested, thereby improving functional diversity and being more convenient to use.

[0006] However, although this solution immerses the valve in the test liquid to corrode the inside of the valve, the corrosion condition inside the valve cannot be viewed from outside the observation window. Even if the valve is removed to inspect the corrosion condition inside, it is impossible to determine the impact of the corrosion on the valve performance. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, solve or at least alleviate the problem that existing valve corrosion resistance detection equipment cannot determine the impact of corrosion on valve performance, and provide a valve corrosion resistance detection device and detection method.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a valve corrosion resistance testing device, comprising a testing cabinet, wherein the valve to be tested is fixedly arranged on the upper part of the testing cabinet, and further comprising:

[0009] a first corrosive liquid barrel, which is used to store corrosive liquid, and the first corrosive liquid barrel is located in the detection cabinet;

[0010] A liquid inlet pipe, used to transport the corrosive liquid in the first corrosive liquid barrel to the valve to be tested, one end of the liquid inlet pipe being connected to the liquid inlet of the valve to be tested, and the other end being connected to the first corrosive liquid barrel;

[0011] A pressurizing component, which is used to pressurize the liquid inlet of the valve to be tested;

[0012] A liquid outlet pipe, used to return the corrosive liquid in the valve to be tested to the first corrosive liquid barrel, one end of the liquid outlet pipe is connected to the liquid outlet of the valve to be tested, and the other end is connected to the first corrosive liquid barrel;

[0013] A leak detection component, which is used to detect the leakage per unit time at the liquid inlet of the valve to be tested when it is closed;

[0014] A torque measuring assembly for detecting the torque required to rotate the rotating rod of the valve to be tested when the valve to be tested is opened and closed;

[0015] The timer is used to measure the duration of corrosion of the valve to be inspected by the corrosive liquid, and to control the working interval duration of the torque measuring component, and also to control the pressurization duration of the pressurizing component.

[0016] In order to further realize the present invention, the following technical solutions may be preferably used:

[0017] Preferably, the pressurizing component comprises:

[0018] The pressurized pipe is vertically arranged on the top of the liquid inlet pipe, the lower end of the pressurized pipe is connected to the liquid inlet pipe, and the upper end is connected to the constant pressure gas source.

[0019] Preferably, the leak detection assembly comprises:

[0020] A leak detection tube, which is vertically arranged on the liquid outlet pipe, with the upper end of the leak detection tube closed and the lower end connected to the liquid outlet pipe;

[0021] A piston plate, the piston plate being sealingly and slidably disposed in the leak detection tube;

[0022] The pressure transmitter is used to detect the pressure of the leak detection tube in the space above the piston plate. The pressure transmitter is installed at the upper end of the leak detection tube.

[0023] Preferably, the leak detection assembly further comprises:

[0024] The spring is located in the leak detection tube, and the upper and lower ends of the leak detection tube are respectively connected to the upper end of the leak detection tube and the piston plate.

[0025] Preferably, the torque measuring assembly comprises:

[0026] A connecting sleeve, the lower end of which is detachably connected to a rotating rod of the valve to be tested;

[0027] A power device, which is used to drive the connecting sleeve to rotate;

[0028] The torque sensor is used to detect the torque when the rotating rod of the valve to be detected rotates. The input end of the torque sensor is connected to the output end of the power equipment, and the output end of the torque sensor is connected to the connecting sleeve.

[0029] Preferably, the torque measuring assembly further comprises:

[0030] The mounting plate is longitudinally slidably arranged on the detection cabinet, and the power equipment, torque sensor and connecting sleeve are all installed on the mounting plate.

[0031] Preferably, it also includes:

[0032] A fixing assembly, which is used to fix the valve to be tested to the test cabinet, and the fixing assembly includes:

[0033] A fixed screw is arranged horizontally and rotatably on the detection cabinet. The two fixed screws are respectively located on both sides of the upper part of the detection cabinet. The two fixed screws are rotated toward one end of the valve to be detected and connected to the end of the liquid inlet pipe and the liquid outlet pipe away from the valve to be detected.

[0034] Preferably, it also includes:

[0035] The second corrosive liquid barrel is used to store corrosive liquid. The second corrosive liquid barrel is located in the detection cabinet and is connected to the first corrosive liquid barrel. The concentration of the corrosive liquid in the second corrosive liquid barrel is greater than that in the first corrosive liquid barrel.

[0036] A valve corrosion resistance detection method is provided. The detection method is based on a valve corrosion resistance detection device and includes the following steps:

[0037] Step 1: Fill the corrosive liquid, adjust the valve to be tested to an open state, inject the corrosive liquid in the first corrosive liquid barrel into the valve through the liquid inlet pipe, and then close the liquid inlet pipe and the liquid outlet pipe with the first corrosive liquid barrel;

[0038] Step 2: Torque test: After the timer reaches the time unit T, rotate the valve stem to make the valve closed from the open state. Then, rotate the valve stem in the opposite direction to make the valve open from the closed state. The torque used for rotation is recorded. The degree of adhesion caused by corrosion is determined by the torque obtained.

[0039] Step 3: Leak detection: When the rotating rod of the valve to be tested is rotated to the closed state, the pressurizing component is used to apply pressure to the liquid inlet of the valve to be tested for a period of time t. The leakage amount at the liquid inlet of the valve to be tested within the period of time t is obtained by the leak detection component;

[0040] Step 4: Repeat steps 2 to 3 until the leakage within the time t reaches the set limit leakage Q. Record the number of times step 2 is repeated to obtain the detection time T. max .

[0041] The beneficial effects of the present invention are:

[0042] 1. The present invention injects the corrosive liquid in the first corrosive liquid barrel into the valve to be tested through the liquid inlet pipe to corrode the inside of the valve, thereby more accurately judging the impact of corrosion on valve performance.

[0043] 2. The present invention measures the torque required to open and close a corroded valve through a torque measuring component, thereby determining the impact of corrosion on the opening and closing of the valve. At the same time, the torque measuring component can also switch the opening and closing state of the valve. When the valve is in a closed state, the leakage amount is detected through the leakage detection component to accurately determine the impact of corrosion on the opening and closing performance of the valve.

[0044] 3. The present invention gradually adds the high-concentration corrosive liquid in the second corrosive liquid barrel to the low-concentration corrosive liquid in the first corrosive liquid barrel, thereby detecting the corrosion degree of the valve caused by corrosive liquids of different concentrations, reducing the number of valves used in the test. The corrosion resistance test is a destructive test, and reducing the number of valves used in the test can reduce the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the present invention.

[0046] Figure 2 It is a structural cross-sectional view of the present invention.

[0047] Figure 3 For the present invention Figure 2 A magnified view of the structure at center A.

[0048] The accompanying drawings are marked as follows: 1. Detection cabinet; 2. First corrosive liquid barrel; 3. Liquid inlet pipe; 4. Liquid outlet pipe; 5. Pressurized pipe; 6. Leak detection pipe; 7. Piston plate; 8. Pressure transmitter; 9. Spring; 10. Connecting sleeve; 11. Power equipment; 12. Torque sensor; 13. Mounting plate; 14. Fixing screw; 15. Second corrosive liquid barrel. DETAILED DESCRIPTION

[0049] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0050] The following will be combined with the accompanying 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 embodiments described 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0051] Example 1

[0052] The primary function of a valve is to open and close. Internal corrosion can cause leakage and can also cause the valve stem to stick to the valve chamber. Therefore, testing for internal valve corrosion is far more important than testing for external corrosion. Current testing equipment can only visually inspect the extent of valve corrosion and cannot determine its impact on valve performance.

[0053] Reference Figure 1-Figure 3 A valve corrosion resistance testing device includes a testing cabinet 1, a valve to be tested is fixedly arranged on the upper part of the testing cabinet 1, and further includes:

[0054] The first corrosive liquid barrel 2 is used for storing the corrosive liquid. The first corrosive liquid barrel 2 is located in the detection cabinet 1 .

[0055] The liquid inlet pipe 3 is used to transport the corrosive liquid in the first corrosive liquid barrel 2 to the valve to be tested. One end of the liquid inlet pipe 3 is connected to the liquid inlet of the valve to be tested, and the other end is connected to the first corrosive liquid barrel 2.

[0056] The pressurizing component is used to pressurize the liquid inlet of the valve to be tested.

[0057] The liquid outlet pipe 4 is used to return the corrosive liquid in the valve to be tested to the first corrosive liquid barrel 2. One end of the liquid outlet pipe 4 is connected to the liquid outlet of the valve to be tested, and the other end is connected to the first corrosive liquid barrel 2.

[0058] The leak detection component is used to detect the leakage amount per unit time at the liquid inlet of the valve to be tested when the valve is closed.

[0059] The torque measuring component is used to detect the torque required to rotate the rotating rod of the valve to be tested when the valve to be tested is opened and closed.

[0060] The timer is used to measure the duration of corrosion of the valve to be inspected by the corrosive liquid, and to control the working interval of the torque measuring component, and also to control the pressurization duration of the pressurizing component.

[0061] In this embodiment, the pressurizing assembly includes a pressurizing tube 5 , which is vertically arranged on the top of the liquid inlet tube 3 . The lower end of the pressurizing tube 5 is connected to the liquid inlet tube 3 , and the upper end is connected to the constant pressure gas source.

[0062] The pressurizing pipe 5 is vertically arranged above the liquid inlet pipe 3 to prevent the corrosive liquid in the liquid inlet pipe 3 from entering the constant pressure gas source.

[0063] In order to measure the leakage, the leak detection assembly includes a leak detection tube 6, a piston plate 7, a pressure transmitter 8 and a spring 9.

[0064] The leak detecting tube 6 is vertically arranged on the liquid outlet pipe 4, the upper end of the leak detecting tube 6 is closed, and the lower end is connected to the liquid outlet pipe 4 to prevent the corrosive liquid in the liquid outlet pipe 4 from entering the upper part of the leak detecting tube 6, and the piston plate 7 is sealingly and slidingly arranged in the leak detecting tube 6. The pressure transmitter 8 is used to detect the pressure of the leak detecting tube 6 in the space above the piston plate 7. The pressure transmitter 8 is installed at the upper end of the leak detecting tube 6, and the spring 9 is located in the leak detecting tube 6. The upper and lower ends of the leak detecting tube 6 are respectively connected to the upper end of the leak detecting tube 6 and the piston plate 7 to prevent the spring 9 from falling into the liquid outlet pipe 4. At the same time, a thrust is generated on the piston plate 7 to reduce the stroke of the piston plate 7.

[0065] The torque measuring assembly includes a connecting sleeve 10 , a torque sensor 12 , a power device 11 and a mounting plate 13 .

[0066] The lower end of the connecting sleeve 10 can be detachably connected to the rotating rod of the valve to be tested. The power equipment 11 is used to drive the connecting sleeve 10 to rotate. The torque sensor 12 is used to detect the torque when the rotating rod of the valve to be tested is rotated. The input end of the torque sensor 12 is connected to the output end of the power equipment 11, and the output end of the torque sensor 12 is connected to the connecting sleeve 10. The mounting plate 13 is longitudinally slidably arranged on the detection cabinet 1, and the power equipment 11, the torque sensor 12 and the connecting sleeve 10 are all installed on the mounting plate 13.

[0067] In order to facilitate the fixation of the valve to be tested, the valve corrosion resistance testing device also includes a fixing component, which is used to fix the valve to be tested to the testing cabinet 1. The fixing component includes a fixing screw 14. The fixing screw 14 is arranged horizontally and rotatably on the testing cabinet 1. The two fixing screws 14 are respectively located on both sides of the upper part of the testing cabinet 1. The two fixing screws 14 are rotated toward one end of the valve to be tested and are respectively connected to the end of the liquid inlet pipe 3 and the end of the liquid outlet pipe 4 away from the valve to be tested.

[0068] Example 2

[0069] Corrosion resistance testing is a destructive test. The valve cannot be used after testing. Different concentrations of corrosive liquid will produce different corrosion effects on the valve. In order to detect the corrosion of the valve in corrosive liquids of different concentrations, multiple valves need to be tested. The testing cost is high and the testing time is long.

[0070] For this purpose, refer to Figure 3 In this embodiment, the valve corrosion resistance detection device also includes a second corrosive liquid barrel 15, which is used to store corrosive liquid. The second corrosive liquid barrel 15 is located in the detection cabinet 1 and is connected to the first corrosive liquid barrel 2. The concentration of the corrosive liquid in the second corrosive liquid barrel 15 is greater than the concentration of the corrosive liquid in the first corrosive liquid barrel 2.

[0071] When the corrosive liquid in the first corrosive liquid barrel 2 causes corrosion to the valve, after the leakage amount reaches Q1, the detection time T1 is recorded, and then a portion of the high-concentration corrosive liquid in the second corrosive liquid barrel 15 is added to the first corrosive liquid barrel 2 to increase the concentration of the corrosive liquid in the first corrosive liquid barrel 2. Then, the detection is continued. After the leakage amount reaches Q2, the detection time T2 is recorded. The corrosion condition of the valve in the high-concentration corrosive liquid is judged by the difference between Q2 and Q1 and the difference between T2 and T1.

[0072] Since the present invention can digitally reflect the corrosion condition of the valve, the corrosion condition in corrosive liquids with different concentrations can be detected using one valve.

[0073] Example 3

[0074] A method for detecting the corrosion resistance of a valve comprises the following steps:

[0075] Step 1: Fill the corrosive liquid, adjust the valve to be tested to the open state, inject the corrosive liquid in the first corrosive liquid barrel 2 into the valve through the liquid inlet pipe 3, and then make the liquid inlet pipe 3 and the liquid outlet pipe 4 and the first corrosive liquid barrel 2 in a closed state;

[0076] Step 2: Torque test: After the timer reaches the time unit T, rotate the valve stem to make the valve closed from the open state. Then, rotate the valve stem in the opposite direction to make the valve open from the closed state. The torque used for rotation is recorded. The degree of adhesion caused by corrosion is determined by the torque obtained.

[0077] Step 3: Leak detection: When the rotating rod of the valve to be tested is rotated to the closed state, the pressurizing component is used to apply pressure to the liquid inlet of the valve to be tested for a period of time t. The leakage amount at the liquid inlet of the valve to be tested within the period of time t is obtained by the leak detection component;

[0078] Step 4: Repeat steps 2 to 3 until the leakage within the time t reaches the set limit leakage Q. Record the number of times step 2 is repeated to obtain the detection time T. max .

[0079] The following steps are also included:

[0080] Step 5: High concentration detection: add a portion of the high concentration corrosive liquid in the second corrosive liquid barrel 15 into the first corrosive liquid barrel 2 to increase the concentration of the corrosive liquid in the first corrosive liquid barrel 2, and then cycle through steps 2 to 4 to obtain corrosion data of the valve in corrosive liquids of different concentrations.

[0081] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A valve corrosion resistance testing method, characterized by: A detection device for the detection method comprises a detection cabinet (1), a valve to be detected is fixedly arranged on the upper part of the detection cabinet (1), and further comprises: A first corrosive liquid barrel (2) for storing corrosive liquid, wherein the first corrosive liquid barrel (2) is located in the detection cabinet (1); A liquid inlet pipe (3) is used to transport the corrosive liquid in the first corrosive liquid barrel (2) to the valve to be tested, one end of the liquid inlet pipe (3) is connected to the liquid inlet of the valve to be tested, and the other end is connected to the first corrosive liquid barrel (2); A pressurizing component, which is used to pressurize the liquid inlet of the valve to be tested; A liquid outlet pipe (4) is used to return the corrosive liquid in the valve to be tested to the first corrosive liquid barrel (2), one end of the liquid outlet pipe (4) is connected to the liquid outlet of the valve to be tested, and the other end is connected to the first corrosive liquid barrel (2); A leak detection component, which is used to detect the leakage per unit time at the liquid inlet of the valve to be tested when it is closed; A torque measuring assembly for detecting the torque required to rotate the rotating rod of the valve to be tested when the valve to be tested is opened and closed; A timer for measuring the duration of corrosion of the valve to be inspected by the corrosive liquid, controlling the working interval of the torque measuring component, and controlling the pressurization duration of the pressurizing component; a second corrosive liquid barrel (15) for storing corrosive liquid, wherein the second corrosive liquid barrel (15) is located in the detection cabinet (1) and is connected to the first corrosive liquid barrel (2), and the concentration of the corrosive liquid in the second corrosive liquid barrel (15) is greater than the concentration of the corrosive liquid in the first corrosive liquid barrel (2); The detection method comprises the following steps: S1, pouring the corrosive liquid, adjusting the valve to be tested to an open state, injecting the corrosive liquid in the first corrosive liquid barrel (2) into the valve through the liquid inlet pipe (3), and then making the liquid inlet pipe (3) and the liquid outlet pipe (4) and the first corrosive liquid barrel (2) in a closed state; S2. Torque test: After the timer counts down to T, rotate the valve stem to close the valve from the open state. Then, rotate the valve stem in the opposite direction to open the valve from the closed state. The torque used for rotation is recorded. The degree of adhesion caused by corrosion is determined by the torque obtained. S3. Leakage detection: When the rotating rod of the valve to be tested is rotated to the closed state, the pressurizing component applies pressure to the liquid inlet of the valve to be tested for a period of time t. The leakage amount at the liquid inlet of the valve to be tested within the period of time t is obtained by the leak detection component; S4, loop through steps S2 and S3 until the leakage within time t reaches the set limit leakage Q, record the number of times step S2 is looped, and obtain the detection time T max ; S5, high concentration detection, adding a portion of the high concentration corrosive liquid in the second corrosive liquid barrel (15) into the first corrosive liquid barrel (2), thereby increasing the concentration of the corrosive liquid in the first corrosive liquid barrel (2), and then cyclically performing steps S2 to S4 to obtain corrosion data of the valve in corrosive liquids of different concentrations; When the corrosive liquid in the first corrosive liquid barrel (2) causes corrosion to the valve, after the leakage amount reaches Q1, the detection time T1 is recorded, and then a portion of the high-concentration corrosive liquid in the second corrosive liquid barrel (15) is added to the first corrosive liquid barrel (2) to increase the concentration of the corrosive liquid in the first corrosive liquid barrel (2), and then the detection is continued. After the leakage amount reaches Q2, the detection time T2 is recorded, and the corrosion condition of the valve in the high-concentration corrosive liquid is judged by the difference between Q2 and Q1 and the difference between T2 and T1.

2. The detection method according to claim 1, wherein: The pressurizing assembly comprises: A pressurized pipe (5) is vertically arranged on the liquid inlet pipe (3), the lower end of the pressurized pipe (5) is connected to the liquid inlet pipe (3), and the upper end is connected to the constant pressure gas source.

3. The detection method according to claim 1, wherein: The leak detection assembly comprises: A leak detection tube (6), the leak detection tube (6) being vertically arranged on the liquid outlet pipe (4), the upper end of the leak detection tube (6) being closed, and the lower end being connected to the liquid outlet pipe (4); A piston plate (7), the piston plate (7) being sealingly slidably disposed in the leak detection tube (6); A pressure transmitter (8) is used to detect the pressure in the space above the piston plate (7) where the leak detection tube (6) is located. The pressure transmitter (8) is installed at the upper end of the leak detection tube (6).

4. The detection method according to claim 3, wherein: The leak detection assembly further comprises: A spring (9) is located in the leak detection tube (6), and the upper and lower ends of the leak detection tube (6) are respectively connected to the upper end of the leak detection tube (6) and the piston plate (7).

5. The detection method according to claim 1, wherein: The torque measuring assembly comprises: A connecting sleeve (10), the lower end of which is detachably connected to a rotating rod of a valve to be tested; A power device (11) for driving the connecting sleeve (10) to rotate; A torque sensor (12) is used to detect the torque when a rotating rod driving a valve to be detected rotates, wherein the input end of the torque sensor (12) is connected to the output end of the power device (11), and the output end of the torque sensor (12) is connected to the connecting sleeve (10).

6. The detection method according to claim 5, wherein: The torque measuring assembly further comprises: A mounting plate (13) is longitudinally slidably disposed on the detection cabinet (1), and the power device (11), the torque sensor (12) and the connecting sleeve (10) are all mounted on the mounting plate (13).

7. The detection method according to claim 1, wherein: The detection device also includes: A fixing assembly, used for fixing the valve to be tested to the test cabinet (1), the fixing assembly comprising: A fixed screw (14) is disposed transversely and rotatably on the detection cabinet (1), and the two fixed screws (14) are respectively located on both sides of the upper portion of the detection cabinet (1). The ends of the two fixed screws (14) facing the valve to be detected are respectively rotatably connected to the ends of the liquid inlet pipe (3) and the liquid outlet pipe (4) away from the valve to be detected.

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