Valve corrosion resistance detection device and detection method

Abstract

The invention relates to the technical field of valves, and discloses a valve corrosion resistance detection device and detection method. A valve corrosion resistance detection device comprises a detection cabinet and further comprises a first corrosive liquid barrel and a second corrosive liquid barrel, a liquid inlet pipe; the pressurizing assembly is used for pressurizing a liquid inlet of the valve to be detected; a liquid outlet pipe; the leak detection assembly is used for detecting the leakage rate of a liquid inlet of the valve to be detected in unit time when the valve to be detected is closed; the torque measuring assembly is used for detecting the torque required for rotating a rotating rod of the to-be-detected valve when the to-be-detected valve is opened and closed; and a timer. A valve corrosion resistance detection method comprises the following steps of 1, corrosive liquid pouring, 2, torque detection, 3, leakage detection and 4, circulating the step 2 to the step 3. The leakage amount is detected through the leakage detection assembly, the influence of corrosion on the opening and closing performance of the valve can be accurately judged, the number of valves used for detection is reduced, and the detection cost is reduced.

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 a 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 valves is an extremely important factor.

[0003] The main function of a valve is to open and close. When the inside of a valve is corroded, it will cause leakage and the valve stem and the valve chamber will stick together. Therefore, the corrosion detection of the inside of the valve is far more important than the corrosion detection of its appearance.

[0004] However, most of the corrosion resistance tests are currently conducted using salt spray testers. The valve to be tested is placed in the salt spray tester, and after a period of corrosion, the corrosion degree is determined by observing the valve surface. Although the corrosion condition of the valve's outer surface can be used to roughly determine the corrosion condition inside the valve, there are various parts inside the valve, and the corrosion condition of the valve's outer surface can only roughly determine the corrosion condition inside the valve chamber, and cannot determine the impact of corrosion on the valve's 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 a support plate respectively, a bearing is clamped on the upper surface of the support plate, and a rotating shaft is sleeved on the inner side wall of the bearing; a threaded column is driven by a driving motor to rotate, 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 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 checked from outside the observation window. Even if the valve is taken out to check 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 the 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 object, the present invention provides the following technical solution: a valve corrosion resistance detection device, comprising a detection cabinet, the valve to be detected is fixedly arranged on the upper part of the detection cabinet, and further comprising: A first corrosive liquid barrel, which is used to store the corrosive liquid, and the first corrosive liquid barrel is located in the detection cabinet; 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 is connected to the liquid inlet of the valve to be tested, and the other end is connected to the first corrosive liquid barrel; A pressurizing component, which is used to pressurize the liquid inlet of the valve to be tested; A liquid outlet pipe, which is used to return the corrosive liquid in the valve to be tested to the first corrosive liquid barrel, wherein 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; 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 the valve is closed; A torque measuring assembly, which 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; 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.

[0009] In order to further realize the present invention, the following technical solutions may be preferably selected: Preferably, the pressurizing component comprises: A 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 of the pressurized pipe is connected to the constant pressure gas source.

[0010] Preferably, the leak detection assembly comprises: 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; A piston plate, the piston plate is sealingly and slidably disposed in the leak detection tube; The pressure transmitter is used to detect the pressure of the space on the upper side of the piston plate of the leak detection tube, and the pressure transmitter is installed on the upper end of the leak detection tube.

[0011] Preferably, the leak detection assembly further comprises: 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.

[0012] Preferably, the torque measuring assembly comprises: A connecting sleeve, the lower end of which is detachably connected to a rotating rod of the valve to be tested; A power device, which is used to drive the connecting sleeve to rotate; 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 device, and the output end of the torque sensor is connected to the connecting sleeve.

[0013] Preferably, the torque measuring assembly further comprises: The mounting plate is longitudinally slidably arranged on the detection cabinet, and the power equipment, the torque sensor and the connecting sleeve are all mounted on the mounting plate.

[0014] Preferably, it also includes: A fixing assembly, which is used to fix the valve to be tested to the testing cabinet, and the fixing assembly includes: A fixed screw is arranged horizontally and rotatably on the detection cabinet. Two fixed screws are respectively located on both sides of the upper part of the detection cabinet. One end of the two fixed screws facing the valve to be detected is rotatably connected to the end of the liquid inlet pipe and the liquid outlet pipe away from the valve to be detected.

[0015] Preferably, it also includes: The second corrosive liquid barrel is used to store the 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 the concentration of the corrosive liquid in the first corrosive liquid barrel.

[0016] A valve corrosion resistance detection method, the detection method is based on a valve corrosion resistance detection device, comprising the following steps: 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 make the liquid inlet pipe and the liquid outlet pipe and the first corrosive liquid barrel in a closed state; Step 2: Torque detection: when the timer counts for a unit time of T, rotate the rotating rod of the valve to be detected to make the valve to be detected change from an open state to a closed state, and then rotate the rotating rod of the valve to be detected in the opposite direction to restore the valve to be detected from a closed state to an open state, and record the torque used for rotation, and judge the degree of adhesion caused by corrosion by the obtained torque; Step 3: Leakage detection: when the rotating rod of the valve to be detected is rotated to the closed state, the pressure-applying component is used to apply pressure to the liquid inlet of the valve to be detected. The pressurization time is t, and the leakage amount at the liquid inlet of the valve to be detected within t time is obtained through the leak detection component; Step 4: Repeat step 2 to step 3 until the leakage in time t reaches the set limit leakage Q. Record the number of times step 2 is repeated to obtain the detection time T.max .

[0017] The beneficial effects of the present invention are: 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.

[0018] 2. The present invention measures the torque required for opening and closing a valve in a corroded state by means of a torque measuring component, thereby determining the effect 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 by means of a leakage detection component, thereby accurately determining the effect of corrosion on the opening and closing performance of the valve.

[0019] 3. The present invention gradually adds the high-concentration corrosive liquid in the second corrosive liquid barrel into 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 for detection. The corrosion resistance detection is a destructive detection, and reducing the number of valves used for detection can reduce the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a structural cross-sectional view of the present invention.

[0022] Figure 3 For the present invention Figure 2 A magnified view of the structure in the middle.

[0023] The accompanying drawings are marked as follows: 1. detection cabinet; 2. first corrosive liquid barrel; 3. liquid inlet pipe; 4. liquid outlet pipe; 5. pressurizing 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

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1 The main function of a valve is to open and close. When the inside of a valve corrodes, it will cause leakage and the valve stem and valve chamber will stick together. Therefore, the corrosion detection of the inside of the valve is far more important than the corrosion detection of its appearance. The current detection equipment can only visually detect the corrosion degree of the valve, and cannot determine the impact of corrosion on the performance of the valve.

[0027] Reference Figure 1-Figure 3 A valve corrosion resistance detection device includes a detection cabinet 1, a valve to be detected is fixedly arranged on the upper part of the detection cabinet 1, and also includes: 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 .

[0028] 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.

[0029] The pressurizing component is used to pressurize the liquid inlet of the valve to be tested.

[0030] 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 .

[0031] The leak detection component is used to detect the leakage amount per unit time at the liquid inlet of the valve to be detected when the valve is closed.

[0032] 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.

[0033] The timer is used to measure the corrosion time of the corrosive liquid on the valve to be inspected, and to control the working interval time of the torque measuring component, and also to control the pressurization time of the pressurizing component.

[0034] In this embodiment, the pressurizing component 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.

[0035] 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.

[0036] 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.

[0037] The leak detection tube 6 is vertically arranged on the liquid outlet pipe 4, the upper end of the leak detection 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 detection tube 6, the piston plate 7 is sealingly and slidably arranged in the leak detection tube 6, the pressure transmitter 8 is used to detect the pressure of the leak detection tube 6 in the space above the piston plate 7, the pressure transmitter 8 is installed at the upper end of the leak detection tube 6, the spring 9 is located in the leak detection tube 6, 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 to prevent the spring 9 from falling into the liquid outlet pipe 4, and at the same time generate thrust on the piston plate 7 to reduce the stroke of the piston plate 7.

[0038] The torque measuring assembly includes a connecting sleeve 10 , a torque sensor 12 , a power device 11 and a mounting plate 13 .

[0039] 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, 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.

[0040] 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, and the fixing component includes a fixing screw 14, which is horizontally arranged and rotatably arranged on the testing cabinet 1, and the two fixing screws 14 are respectively located on both sides of the upper part of the testing cabinet 1, and the two fixing screws 14 are respectively rotated and 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.

[0041] Embodiment 2 Corrosion resistance testing is a destructive test. The valve cannot be used after the test. Different concentrations of corrosive liquid have 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.

[0042] 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.

[0043] When the corrosive liquid in the first corrosive liquid barrel 2 causes corrosion to the valve, the leakage amount reaches Q 1 After that, record the detection time T 1 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 until the leakage reaches Q 2 After that, record the detection time T 2 , via Q 2 With Q 1 The difference and T 2 With T 1 The difference between the values ​​of and can be used to determine the corrosion condition of the valve in a corrosive solution with a higher concentration.

[0044] Since the present invention can digitize the corrosion condition of the valve, the corrosion condition in corrosive liquids with different concentrations can be detected with one valve.

[0045] Embodiment 3 A method for detecting corrosion resistance of a valve comprises the following steps: 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 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; Step 2: Torque detection: when the timer counts for a unit time of T, rotate the rotating rod of the valve to be detected to make the valve to be detected change from an open state to a closed state, and then rotate the rotating rod of the valve to be detected in the opposite direction to restore the valve to be detected from a closed state to an open state, and record the torque used for rotation, and judge the degree of adhesion caused by corrosion by the obtained torque; Step 3: Leakage detection: when the rotating rod of the valve to be detected is rotated to the closed state, the pressure-applying component is used to apply pressure to the liquid inlet of the valve to be detected. The pressurization time is t, and the leakage amount at the liquid inlet of the valve to be detected within t time is obtained through the leak detection component; Step 4: Repeat step 2 to step 3 until the leakage in time t reaches the set limit leakage Q. Record the number of times step 2 is repeated to obtain the detection time T. max .

[0046] The following steps are also included: Step 5, 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 to increase the concentration of the corrosive liquid in the first corrosive liquid barrel 2, and then cyclically performing steps 2 to 4 to obtain the corrosion data of the valve in corrosive liquids of different concentrations.

[0047] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve corrosion resistance testing device, comprising a testing cabinet (1), wherein a valve to be tested is fixedly arranged on the upper part of the testing cabinet (1), and characterized in that: Also includes: A first corrosive liquid barrel (2), which is used to store corrosive liquid, and the first corrosive liquid barrel (2) is located in the detection cabinet (1); A liquid inlet pipe (3) used for conveying the corrosive liquid in the first corrosive liquid barrel (2) to the valve to be tested, one end of the liquid inlet pipe (3) being connected to the liquid inlet of the valve to be tested, and the other end being 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) used for returning the corrosive liquid in the valve to be inspected 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 inspected, 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 the valve is closed; A torque measuring assembly, which 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; 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.

2. A valve corrosion resistance detection device according to claim 1, characterized in that: The pressurizing component comprises: A pressurizing pipe (5), the pressurizing pipe (5) is vertically arranged on the top of the liquid inlet pipe (3), the lower end of the pressurizing pipe (5) is connected to the liquid inlet pipe (3), and the upper end is connected to the constant pressure gas source.

3. A valve corrosion resistance detection device according to claim 1, characterized in that: The leak detection assembly comprises: A leak detection tube (6), the leak detection tube (6) being vertically arranged on the liquid outlet tube (4), the upper end of the leak detection tube (6) being closed, and the lower end being connected to the liquid outlet tube (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. A valve corrosion resistance detection device according to claim 1, characterized in that: The leak detection assembly also includes: A spring (9), wherein the 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. A valve corrosion resistance detection device according to claim 1, characterized in that: 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. A valve corrosion resistance detection device according to claim 5, characterized in that: The torque measuring assembly also includes: 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. A valve corrosion resistance detection device according to claim 1, characterized in that: Also includes: A fixing assembly, used for fixing the valve to be tested to the testing cabinet (1), the fixing assembly comprising: A fixed screw rod (14), the fixed screw rod (14) being arranged transversely and rotatably arranged on the detection cabinet (1), the two fixed screw rods (14) being respectively located on both sides of the upper part of the detection cabinet (1), and the ends of the two fixed screw rods (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.

8. A valve corrosion resistance detection device according to claim 1, characterized in that: Also includes: The second corrosive liquid barrel (15) is used to store the 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).

9. A valve corrosion resistance detection method, the detection method is based on a valve corrosion resistance detection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: injecting 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 placing the liquid inlet pipe (3) and the liquid outlet pipe (4) in a closed state with the first corrosive liquid barrel (2); Step 2: Torque detection: when the timer counts for a unit time of T, rotate the rotating rod of the valve to be detected to make the valve to be detected change from an open state to a closed state, and then rotate the rotating rod of the valve to be detected in the opposite direction to restore the valve to be detected from a closed state to an open state, and record the torque used for rotation, and judge the degree of adhesion caused by corrosion by the obtained torque; Step 3: Leakage detection: when the rotating rod of the valve to be detected is rotated to the closed state, the pressure-applying component is used to apply pressure to the liquid inlet of the valve to be detected. The pressurization time is t, and the leakage amount at the liquid inlet of the valve to be detected within t time is obtained through the leak detection component; Step 4: Repeat step 2 to step 3 until the leakage in time t reaches the set limit leakage Q. Record the number of times step 2 is repeated to obtain the detection time T. max .

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