A multi-condition detection device for a diaphragm

Abstract

This invention discloses a multi-condition testing device for diaphragms, belonging to the field of diaphragm testing technology. The key technical features include: a controller, a test chamber containing test liquid, pipes, a drive component, a push-pull force gauge, a drive device, a clamp for holding the diaphragm, and a water pump. The pipes are located inside the test chamber, with an installation port and a protrusion in the middle section. The clamp is located inside the installation port. The water pump is mounted on the pipes to pump the test liquid. The output end of the drive component is connected to the push-pull force gauge, and the end of the force gauge is connected to the middle of the diaphragm. The drive component drives the push-pull force gauge to rise or fall, causing the force gauge to move the diaphragm, and cooperates with the protrusion to control the flow of the middle section of the pipe. The inlet end of the pipes is equipped with a water inlet pipe. The drive device drives the water inlet pipe so that its inlet end can be immersed in the test liquid to different depths or detached from the test liquid. The push-pull force gauge transmits real-time push or pull data to the controller. This testing device can meet the testing needs of different operating conditions.

Description

Technical Field

[0001] This invention belongs to the field of diaphragm testing technology, and specifically relates to a multi-condition testing device for diaphragms. Background Technology

[0002] Chinese Patent No. CN119880668B discloses a diaphragm valve diaphragm life testing device, including a housing, and further including: a first pipe, a second pipe, a water pump, an intermediate pipe, a first testing unit, and a control unit. One end of the second pipe is connected to the upper end of the first pipe, and the other end of the second pipe is connected to the intermediate pipe. The water pump is connected in series with the second pipe. The first testing unit includes a test pipe, one end of which is connected to the intermediate pipe, and the other end of which is located inside the housing. The test pipe has an opening, and a snap-fit ​​component is provided around the opening for installing the diaphragm. A ring is provided around the snap-fit ​​component, and a water-sensitive sensor is provided inside the ring. A drive unit is provided above the test pipe, and a tension sensor is connected to the drive unit. A connecting rod is provided at the bottom of the tension sensor.

[0003] The above technical solution has the following defects: Although the diaphragm life testing device can simultaneously detect the deformation life and rupture life of the diaphragm, it only simulates the ideal working condition of the diaphragm when it is normally filled with liquid, and does not consider the influence of other complex working conditions in industrial scenarios on the diaphragm life, so the test results have certain limitations. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a multi-condition testing device for diaphragms. The technical problem to be solved by this invention is: how to improve the versatility and flexibility of the testing device to meet the testing needs of different operating conditions.

[0005] The above-mentioned technical objective of the present invention can be achieved through the following technical solution: a multi-condition testing device for diaphragms, comprising a controller, a test tank for holding test liquid, a pipe for supplying the test liquid, a drive component, a push-pull force gauge, a clamp for holding the diaphragm, and a water pump; the pipe is disposed within the test tank, a mounting port is provided in the middle section of the pipe, the clamp is disposed within the mounting port, and the middle section of the pipe has a protrusion; the water pump is disposed on the pipe, and the water pump is used to pump the test liquid from the inlet end of the pipe to the outlet end of the pipe; the output end of the drive component is connected to the push-pull force gauge, and so on. The end of the push-pull force gauge is connected to the middle of the diaphragm. The driving component is used to drive the push-pull force gauge to rise or fall, so that the push-pull force gauge drives the middle of the diaphragm to rise or fall, thereby cooperating with the protrusion to control the opening and closing of the middle section of the pipeline. A driving device is provided in the test box, and a water inlet pipe is provided at the inlet end of the pipeline. The driving device is used to drive the water inlet pipe so that its inlet end can be immersed in the test liquid to different depths or detached from the test liquid. The driving component, the push-pull force gauge, the driving device, and the water pump are all electrically connected to the controller. The push-pull force gauge transmits real-time push or pull data to the controller.

[0006] In the above-mentioned multi-condition testing device for diaphragms, a corrugated section is provided in the middle of the water inlet pipe, and the output end of the driving device is connected to the end of the water inlet pipe. The driving device is used to drive the water inlet pipe to expand or retract the corrugated section. When the corrugated section expands, the water inlet end of the water inlet pipe is immersed in the test liquid. When the corrugated section is completely retracted, the water inlet end of the water inlet pipe is removed from the test liquid.

[0007] In the aforementioned multi-condition testing device for diaphragms, the driving device includes a servo motor, a lead screw, a nut, a slide rail, and a slider. The servo motor is electrically connected to the controller, which can control the rotational speed of the servo motor. The output end of the servo motor is connected to the lead screw. The nut is threadedly connected to the lead screw. The slider is slidably mounted on the slide rail, and the nut is connected to the slider. The inlet end of the water inlet pipe is detachably connected to a linkage sleeve, which has a connecting part that is connected to the slider.

[0008] In the aforementioned multi-condition testing device for diaphragms, a liquid level sensor is installed inside the test chamber. The liquid level sensor is electrically connected to the controller and is used to detect the real-time liquid level of the test liquid. The testing device also includes a high-speed camera, which is electrically connected to the controller and is used to detect the state of the diaphragm and transmit the data to the controller. A pressure sensor is installed in the middle of the pipeline and is electrically connected to the controller. The pressure sensor is used to detect the water flow pressure at the diaphragm inlet side inside the pipeline and transmit the data to the controller.

[0009] In the above-mentioned multi-condition testing device for diaphragms, the clamp includes an annular base and a clamping ring. The annular base is disposed in the mounting port, and the clamping ring is threadedly connected to the mounting port. The clamping ring can cooperate with the annular base to clamp the diaphragm. Sealing rings are provided on the upper surface of the annular base and the lower surface of the clamping ring.

[0010] In the aforementioned multi-condition testing device for diaphragms, the controller is pre-programmed with a diaphragm periodic dry-run fatigue testing program, a diaphragm sudden dry-run fatigue testing program, a diaphragm cavitation initiation testing program based on inlet condition adjustment, and a diaphragm fatigue testing program simulating fluctuating liquid levels.

[0011] In the aforementioned multi-condition testing equipment for diaphragms, the diaphragm periodic dry-run fatigue testing procedure includes the following steps: S1, controlling the water pump to start and controlling the drive unit to drive the push-pull force gauge to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state, and then controlling the drive unit to drive the push-pull force gauge to rise or fall, so that the push-pull force gauge drives the middle part of the diaphragm to rise or fall; S2, executing a periodic dry-run simulation cycle: controlling the drive unit to drive the water inlet end of the water inlet pipe to gradually rise from a fully submerged state at a first constant speed until the water inlet end of the water inlet pipe leaves the test liquid surface and reaches a corresponding position and remains there for a preset time, and then controlling the drive unit to drive the water inlet end of the water inlet pipe to fall down at a second constant speed to re-immerse in the test liquid and remain there for a preset time; S3, judging whether the diaphragm is damaged according to the image information transmitted by the high-speed camera, and controlling the machine to stop when the diaphragm is damaged.

[0012] In the aforementioned multi-condition testing equipment for diaphragms, the diaphragm sudden dry-run fatigue testing procedure includes the following steps: S1, controlling the water pump to start and controlling the drive unit to drive the push-pull force gauge to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state, and then controlling the drive unit to drive the push-pull force gauge to rise or fall, so that the push-pull force gauge drives the middle part of the diaphragm to rise or fall; S2, executing a sudden dry-run simulation cycle: controlling the drive device to drive the water inlet end of the water inlet pipe to rise rapidly from a fully submerged state at a preset speed, so that the water inlet end of the water inlet pipe is removed from the liquid surface and maintained for a preset time, and then the controller controls the drive device to drive the water inlet end of the water inlet pipe to fall at a constant speed to re-immerse in the test liquid and maintain for a preset time; S3, judging whether the diaphragm is damaged according to the image information transmitted by the high-speed camera, and controlling the shutdown when the diaphragm is damaged.

[0013] In the aforementioned multi-condition testing device for diaphragms, the diaphragm cavitation initiation detection procedure based on inlet condition adjustment includes the following steps: S1, controlling the water pump to start and controlling the drive unit to drive the push-pull force gauge to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state, and then controlling the drive unit to drive the push-pull force gauge to rise or fall, so that the push-pull force gauge drives the middle part of the diaphragm to rise or fall; S2, controlling the drive device to drive the inlet end of the water inlet pipe to immerse in the test liquid, the inlet end of the water inlet pipe is located at a preset initial depth of the test liquid and is maintained for a preset time, and then controlling the drive device to drive the inlet end of the water inlet pipe to rise at a constant speed, so that the inlet end of the water inlet pipe sequentially reaches multiple preset and progressively decreasing immersion depths and is maintained for a preset time; S3, judging from the information transmitted by the pressure sensor that the pressure fluctuates periodically and judging from the image information transmitted by the high-speed camera that bubbles are generated on the diaphragm, controlling the machine to stop.

[0014] In the aforementioned multi-condition testing device for diaphragms, the diaphragm fatigue testing procedure under simulated fluctuating liquid levels includes the following steps: S1, controlling the water pump to start and controlling the drive unit to drive the push-pull force gauge to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state, and then controlling the drive unit to drive the push-pull force gauge to rise or fall, so that the push-pull force gauge drives the middle part of the diaphragm to rise or fall; S2, controlling the drive device to drive the water inlet end of the water inlet pipe to be immersed in the test liquid and maintain it for a preset time, and then controlling the drive device to drive the water inlet end of the water inlet pipe to move up and down reciprocating below the test liquid surface; S3, judging whether the diaphragm is damaged according to the image information transmitted by the high-speed camera, and controlling the machine to stop when the diaphragm is damaged.

[0015] In summary, the advantages of this invention compared to the prior art are as follows:

[0016] 1. This testing equipment can not only simulate the working conditions under normal operating conditions to test the deformation life and service life of the diaphragm, but also drive the water inlet pipe to immerse its water inlet end into the test liquid at different depths or remove it from the test liquid through the drive device, thereby simulating different actual working conditions to test the diaphragm, thereby improving the versatility and flexibility of the testing equipment and meeting the testing needs of different working conditions.

[0017] 2. The controller is pre-programmed with diaphragm periodic dry operation fatigue testing program, diaphragm sudden dry operation fatigue testing program, diaphragm cavitation initiation testing program based on inlet condition adjustment, and diaphragm fatigue testing program under simulated fluctuating liquid level. Operators can flexibly select the appropriate program to execute according to specific testing needs, so as to simulate the testing of the diaphragm under different working conditions. Attached Figure Description

[0018] Figure 1 This is a partial cross-sectional view of an embodiment;

[0019] Figure 2 for Figure 1 Enlarged view of part A;

[0020] Figure 3 for Figure 1 Enlarged view of part B;

[0021] Figure 4 for Figure 1 Enlarged view of part C;

[0022] Figure 5 This is a partial cross-sectional view of another embodiment.

[0023] Reference numerals: 1. Controller; 2. Test chamber; 3. Pipeline; 4. Drive component; 5. Push-pull force gauge; 6. Fixture; 61. Annular base; 62. Compression ring; 7. Water pump; 8. Mounting port; 9. Protrusion; 10. Drive device; 101. Servo motor; 102. Lead screw; 103. Nut; 104. Slide rail; 105. Slider; 11. Corrugated section; 12. Linkage sleeve; 13. Connecting part; 14. Liquid level sensor; 15. High-speed camera; 16. Pressure sensor; 17. Sealing ring; 18. Water inlet pipe; 19. Electric heating element; 20. Semiconductor cooling chip. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] A multi-condition testing device for diaphragms, such as Figures 1 to 5As shown, it includes a controller 1, a test chamber 2 for holding the test liquid, a pipe 3 for supplying the test liquid, a drive unit 4, a push-pull force gauge 5, a high-speed camera 15, a clamp 6 for holding the diaphragm, and a water pump 7.

[0026] It should be noted that the test liquid contained in test chamber 2 can be replaced according to actual working conditions. The test liquid can be water, oil that simulates the viscosity of the actual medium, or liquid containing specific particles, so as to more realistically and effectively detect the performance of the diaphragm in specific application environments.

[0027] It should be noted that for liquids containing specific particles, in order to avoid particle precipitation, a rotating stirring device (not shown in the figure) needs to be installed in the test chamber 2. The stirring device includes a motor and stirring blades. The motor drives the stirring blades to stir the test liquid and avoid particle precipitation.

[0028] The controller 1 is installed outside the test chamber 2, and the pipe 3 is set inside the test chamber 2. The middle section of the pipe 3 is provided with an installation port 8 and a protrusion 9, which is aligned with the installation port 8.

[0029] The clamp 6 is set inside the mounting port 8. In this embodiment, the clamp 6 includes an annular base 61 and a clamping ring 62. The annular base 61 is set inside the mounting port 8, and the clamping ring 62 is threadedly connected inside the mounting port 8. The clamping ring 62 can cooperate with the annular base 61 to clamp the diaphragm, thereby achieving stable clamping of the diaphragm.

[0030] When clamping the diaphragm, first place the diaphragm on the annular base 61, and then thread the clamping ring 62 into the mounting port 8 until the clamping ring 62 engages with the annular base 61 to clamp the diaphragm.

[0031] Sealing rings 17 are provided on the upper surface of the annular base 61 and the lower surface of the clamping ring 62. The sealing rings 17 are in contact with the upper and lower surfaces of the diaphragm, respectively, to seal the upper surface of the annular base 61 and the diaphragm and the lower surface of the clamping ring 62 and the diaphragm, thereby preventing leakage of the test liquid.

[0032] The drive unit 4 is installed on the test box 2. The drive unit 4 is electrically connected to the controller 1. The controller 1 can control the operation of the drive unit 4. The output end of the drive unit 4 is connected to the push-pull force gauge 5. The drive unit 4 is preferably an electric push rod. As another option, the drive unit 4 can also be a cylinder. The end of the push-pull force gauge 5 is connected to the middle of the diaphragm. The drive unit 4 is used to drive the push-pull force gauge 5 to rise or fall, thereby causing the push-pull force gauge 5 to drive the middle of the diaphragm to rise or fall, thereby cooperating with the protrusion 9 to control the opening and closing of the middle section of the pipe 3.

[0033] That is, by extending or retracting the output end of the electric push rod, the push-pull force gauge 5 is driven to rise or fall. The output end of the push-pull force gauge 5 drives the middle part of the diaphragm to rise or fall. As the middle part of the diaphragm falls and comes into contact with the protrusion 9, the middle section of the pipe 3 is separated by the two. Conversely, as the middle part of the diaphragm rises and moves away from the protrusion 9, the middle section of the pipe 3 is in a normal flow state.

[0034] The push-pull force gauge 5 is electrically connected to the controller 1. The push-pull force gauge 5 transmits real-time push or pull data to the controller 1. It should be noted that the drive component 4 drives the push-pull force gauge 5 to rise and fall by the same distance each time. As the push-pull force gauge 5 rises, the diaphragm will apply a pulling force to the push-pull force gauge 5 under normal circumstances. Conversely, as the push-pull force gauge 5 falls, the diaphragm will apply a pushing force to the push-pull force gauge 5 under normal circumstances.

[0035] The water pump 7 is installed on the pipeline 3. The water pump 7 is used to pump the test liquid from the inlet end of the pipeline 3 to the outlet end of the pipeline 3. The water pump 7 is electrically connected to the controller 1, and the controller 1 can control the operation of the water pump 7.

[0036] The test chamber 2 is equipped with a liquid level sensor 14, which is electrically connected to the controller 1. The liquid level sensor 14 is used to detect the real-time liquid level position of the test liquid and transmit it to the controller 1.

[0037] The high-speed camera 15 is mounted on the side wall of the push-pull force gauge 5 and aligned with the diaphragm. The high-speed camera 15 is electrically connected to the controller 1. The high-speed camera 15 is used to detect the state of the diaphragm and transmit the data to the controller 1.

[0038] A pressure sensor 16 is installed in the middle of the pipe 3. The pressure sensor 16 is electrically connected to the controller 1. The pressure sensor 16 is used to detect the water flow pressure on the inlet side of the diaphragm in the pipe 3 and transmit it to the controller 1.

[0039] The test chamber 2 is equipped with a drive device 10, which is electrically connected to the controller 1. The inlet end of the pipe 3 is equipped with a water inlet pipe 18. The drive device 10 is used to drive the water inlet pipe 18 so that its inlet end can be immersed in the test liquid at different depths or detached from the test liquid.

[0040] A corrugated section 11 is provided in the middle of the water inlet pipe 18. The output end of the drive device 10 is connected to the end of the water inlet pipe 18. The drive device 10 is used to drive the water inlet pipe 18 so that the corrugated section 11 can be expanded or retracted. When the corrugated section 11 is expanded, the water inlet end of the water inlet pipe 18 is immersed in the test liquid. When the corrugated section 11 is completely retracted, the water inlet end of the water inlet pipe 18 is removed from the test liquid. The corrugated section 11 is made of an elastomer material, preferably neoprene rubber, so as to ensure the service life of the corrugated section 11 and further meet the test requirements.

[0041] In this embodiment, the drive device 10 includes a servo motor 101, a lead screw 102, a nut 103, a slide rail 104, and a slider 105. The servo motor 101 is electrically connected to the controller 1, and the controller 1 can control the rotational speed of the servo motor 101. The output end of the servo motor 101 is connected to the lead screw 102. The nut 103 is threadedly connected to the lead screw 102. The slider 105 is slidably mounted on the slide rail 104. The nut 103 is connected to the slider 105. The inlet end of the water inlet pipe 18 is detachably connected to a linkage sleeve 12. Preferably, the linkage sleeve 12 is threadedly connected to the inlet end of the water inlet pipe 18. The linkage sleeve 12 is provided with a connecting part 13, which is connected to the slider 105.

[0042] That is, the servo motor 101 drives the lead screw 102 to rotate, so that the nut 103 moves along the lead screw 102, the slider 105 moves along the slide rail 104, the slider 105 drives the linkage sleeve 12 to move through the connecting part 13, the linkage sleeve 12 drives the water inlet end of the water inlet pipe 18 to move, thereby causing the corrugated section 11 to expand or retract.

[0043] When testing the diaphragm under simulated normal operating conditions, the diaphragm is first clamped onto the fixture 6. The controller 1 controls the water pump 7 to work, so that the test liquid in the test chamber 2 flows through the inlet pipe 18 and the pipe 3 in sequence, and then flows back into the test chamber 2. Then, the controller 1 controls the drive component 4 to drive the push-pull force gauge 5 to rise or fall, so that the push-pull force gauge 5 drives the middle part of the diaphragm to rise or fall. During this process, the high-speed camera 15 continuously captures the diaphragm status and transmits the image information to the controller 1. The push-pull force gauge 5 collects the tension or thrust data applied by the diaphragm in real time and transmits it to the controller 1.

[0044] Under normal circumstances, the tension and thrust applied by the diaphragm to the push-pull force gauge 5 will be within a preset range. The preset range is adjusted according to the different materials of the diaphragm. When the tension or thrust value is less than the preset value on the controller 1, it can be determined that the diaphragm has exceeded the allowable deformation range. At this time, the deformation life of the diaphragm can be determined by the number of times the drive component 4 drives the push-pull force gauge 5 to rise and fall, as recorded on the controller 1.

[0045] When the controller 1 determines that the diaphragm is damaged based on the image information transmitted by the high-speed camera 15, it controls the equipment to stop. At this time, the service life of the diaphragm is determined based on the number of times the drive component 4 drives the push-pull force gauge 5 to rise and fall, as recorded on the controller 1.

[0046] It should be noted that when cracks, perforations, or permanent wrinkles are detected in the diaphragm based on the images from the high-speed camera 15, it can be determined that the diaphragm is damaged.

[0047] It should be further explained that the controller 1 compares the tension or thrust value received from the push-pull force gauge 5 with a preset range, and based on the change in the difference after comparison, it can provide an early warning of excessive deformation of the diaphragm before the high-speed camera 15 detects damage to the diaphragm.

[0048] Furthermore, the controller 1 is pre-programmed with a diaphragm periodic dry operation fatigue detection program, a diaphragm sudden dry operation fatigue detection program, a diaphragm cavitation initiation detection program based on inlet condition adjustment, and a diaphragm fatigue detection program simulating fluctuating liquid level.

[0049] The diaphragm periodic dry-run fatigue testing procedure includes the following steps: S1, control the water pump 7 to start, and control the drive component 4 to drive the push-pull force gauge 5 to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state. Then control the drive component 4 to drive the push-pull force gauge 5 to rise or fall, so that the push-pull force gauge 5 drives the middle part of the diaphragm to rise or fall; S2, execute the periodic dry-run simulation cycle: control the drive device 10 to drive the water inlet end of the water inlet pipe 18 to gradually rise from the fully submerged state at a first constant speed until the water inlet end of the water inlet pipe 18 leaves the test liquid surface and reaches the corresponding position and maintains it for a preset time. Then control the drive device 10 to drive the water inlet end of the water inlet pipe 18 to fall at a second constant speed to re-immerse it in the test liquid and maintain it for a preset time; S3, determine whether the diaphragm is damaged based on the image information transmitted by the high-speed camera 15. When the diaphragm is damaged, control the machine to stop.

[0050] The first and second constant speeds of S2 can be adjusted according to the detection requirements. That is, the speed of the servo motor 101 is adjusted by the controller 1, thereby changing the speed at which the water inlet end of the water inlet pipe 18 rises or falls.

[0051] It should be clarified that the diaphragm periodic dry operation fatigue test program mainly simulates periodic dry operation conditions caused by slow blockage of the inlet or gradual drop in liquid level.

[0052] It should be noted that when running the diaphragm periodic dry operation fatigue test program, the judgment principle for the diaphragm service life and deformation life is the same as that used when testing the diaphragm under normal operating conditions. At the same time, based on the number of cyclic dry operation simulation cycles recorded by controller 1, the impact on the diaphragm service life and deformation life under cyclic dry operation conditions is analyzed and judged.

[0053] The diaphragm sudden dry-run fatigue detection procedure includes the following steps: S1, control the water pump 7 to start, and control the drive component 4 to drive the push-pull force gauge 5 to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state. Then control the drive component 4 to drive the push-pull force gauge 5 to rise or fall, so that the push-pull force gauge 5 drives the middle part of the diaphragm to rise or fall; S2, execute the sudden dry-run simulation cycle: control the drive device 10 to drive the water inlet end of the water inlet pipe 18 to rise rapidly from the fully submerged state at a preset speed, so that the water inlet end of the water inlet pipe 18 is removed from the liquid surface and held for a preset time. Then the controller 1 controls the drive device 10 to drive the water inlet end of the water inlet pipe 18 to fall at a constant speed to re-immerse in the test liquid and hold for a preset time; S3, determine whether the diaphragm is damaged based on the image information transmitted by the high-speed camera 15. When the diaphragm is damaged, control the machine to stop.

[0054] It should be clarified that the diaphragm sudden dry operation fatigue test program mainly simulates the sudden dry operation impact condition caused by the sudden closure of the inlet or the sudden drop in liquid level.

[0055] It should be noted that the water inlet end of the water inlet pipe 18 in S2 rises rapidly from the fully submerged state at a preset speed. This preset speed is faster than the first and second constant speeds in the periodic dry running simulation cycle, and can be 1.5-2 times the first and second constant speeds. This preset speed can be adjusted according to the detection requirements.

[0056] It should be noted that when running the diaphragm sudden dry operation fatigue test program, the judgment principle for the diaphragm service life and deformation life is the same as that used when testing the diaphragm under normal operating conditions. At the same time, based on the number of sudden dry operation simulation cycles recorded by controller 1, the impact of sudden dry operation on the diaphragm service life and deformation life is judged and analyzed.

[0057] The diaphragm cavitation initiation detection procedure based on inlet condition adjustment includes the following steps: S1, control the water pump 7 to start, and control the drive component 4 to drive the push-pull force gauge 5 to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state. Then control the drive component 4 to drive the push-pull force gauge 5 to rise or fall, so that the push-pull force gauge 5 drives the middle part of the diaphragm to rise or fall; S2, control the drive device 10 to drive the water inlet end of the water inlet pipe 18 to be immersed in the test liquid. The water inlet end of the water inlet pipe 18 is located at a preset initial depth in the test liquid and is maintained for a preset time. Then control the drive device 10 to drive the water inlet end of the water inlet pipe 18 to rise at a constant speed, so that the water inlet end of the water inlet pipe 18 sequentially reaches multiple preset and progressively decreasing immersion depths and is maintained for a preset time; S3, control the machine to stop when the pressure fluctuates periodically according to the information transmitted by the pressure sensor 16 and when bubbles are generated on the diaphragm according to the image information transmitted by the high-speed camera 15.

[0058] In S2, the water inlet end of the water inlet pipe 18 is located at the preset initial depth of the test liquid. The controller 1 determines and adjusts the water inlet end of the water inlet pipe 18 according to the real-time liquid level position transmitted by the liquid level sensor 14, thereby positioning and maintaining the water inlet end of the water inlet pipe 18 at the preset initial depth in the test liquid. Then, based on the preset initial depth, the controller 1 controls the drive device 10 to drive the water inlet end of the water inlet pipe 18 to reach multiple progressively decreasing immersion depths in a preset order and maintain them for the corresponding preset duration. The preset duration for each depth is the same.

[0059] It should be noted that the diaphragm cavitation initiation detection procedure based on inlet condition adjustment mainly detects the critical conditions for diaphragm cavitation by gradually raising the inlet position.

[0060] It should be noted that when running the diaphragm cavitation initiation detection program based on inlet condition adjustment, the judgment of diaphragm service life and deformation life is the same as that used when detecting the diaphragm under normal operation. At the same time, the controller 1 will record the immersion depth of the water inlet end of the water inlet pipe 18 at the time of cavitation initiation and the water flow pressure value detected by the pressure sensor 16 on the diaphragm inlet side of the pipe 3.

[0061] The simulated diaphragm fatigue testing procedure under fluctuating liquid levels includes the following steps: S1, control the water pump 7 to start, and control the drive component 4 to drive the push-pull force gauge 5 to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state. Then, control the drive component 4 to drive the push-pull force gauge 5 to rise or fall, so that the push-pull force gauge 5 drives the middle part of the diaphragm to rise or fall; S2, control the drive device 10 to drive the water inlet end of the water inlet pipe 18 to be immersed in the test liquid and maintain it for a preset time. Then, control the drive device 10 to drive the water inlet end of the water inlet pipe 18 to move up and down reciprocally below the test liquid surface; S3, determine whether the diaphragm is damaged based on the image information transmitted by the high-speed camera 15. When the diaphragm is damaged, control the machine to stop.

[0062] The simulated diaphragm fatigue testing program under fluctuating liquid levels mainly simulates the fatigue condition of the diaphragm under alternating stress amplitude caused by liquid level fluctuations in real applications.

[0063] It should be noted that when running the diaphragm fatigue test program under simulated fluctuating liquid level, the judgment of diaphragm service life and deformation life is the same as that used when testing the diaphragm under normal operating conditions. At the same time, the number of times the inlet end of the water inlet pipe 18 driven by the drive device 10 moves up and down below the test liquid level is recorded by the controller 1. This is used to judge and analyze the impact of fluctuating liquid level on diaphragm service life and deformation life. Furthermore, the stress amplitude that the diaphragm bears in each fluctuation is analyzed and judged based on the tensile and thrust values ​​transmitted in real time by the push-pull force gauge 5.

[0064] It should be noted that the speed at which the inlet end of the water inlet pipe 18 moves up and down below the test liquid level remains constant, and the speed and stroke of the up and down movement are preset according to the testing requirements.

[0065] It should be noted that by pre-compressing the diaphragm, the diaphragm is brought to a preset initial deformation state, which ensures that the diaphragms are in the same state before testing, thereby ensuring the consistency of the testing.

[0066] As an alternative, a heating element, a cooling element, and a temperature sensor can be installed inside the test chamber 2 to control the temperature of the test liquid and simulate the effect of actual operating temperature on the diaphragm. The heating element can be an electric heating tube 19, and the cooling element can be a semiconductor refrigeration chip 20.

[0067] The specific embodiments described herein are merely illustrative of the spirit of the invention; those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A multi-condition testing device for diaphragms, characterized in that: The device includes a controller (1), a test chamber (2) for holding the test liquid, a pipe (3) for supplying the test liquid, a drive unit (4), a push-pull force gauge (5), a clamp (6) for holding the diaphragm, and a water pump (7). The pipe (3) is located inside the test chamber (2), and an installation port (8) is provided in the middle section of the pipe (3). The clamp (6) is located inside the installation port (8), and the middle section of the pipe (3) has a protrusion (9). The water pump (7) is located on the pipe (3) and is used to pump the test liquid from the inlet end of the pipe (3) to the outlet end of the pipe (3). The output end of the drive unit (4) is connected to the push-pull force gauge (5). The end of the force gauge (5) is connected to the middle of the diaphragm. The driving component (4) is used to drive the push-pull force gauge (5) to rise or fall, so that the push-pull force gauge (5) drives the middle of the diaphragm to rise or fall, thereby cooperating with the protrusion (9) to control the opening and closing of the middle section of the pipe (3); the test box (2) is equipped with a driving device (10), and the inlet end of the pipe (3) is equipped with a water inlet pipe (18). The driving device (10) is used to drive the water inlet pipe (18) so that its inlet end can be immersed in the test liquid at different depths or detached from the test liquid. The driving component (4), the push-pull force gauge (5), the driving device (10) and the water pump (7) are all electrically connected to the controller (1). The force gauge (5) transmits real-time thrust or tension data to the controller (1); a liquid level sensor (14) is installed in the test chamber (2), which is electrically connected to the controller (1). The liquid level sensor (14) is used to detect the real-time liquid level of the test liquid. The detection device also includes a high-speed camera (15), which is electrically connected to the controller (1). The high-speed camera (15) is used to detect the state of the diaphragm and transmit the data to the controller (1). A pressure sensor (16) is installed in the middle of the pipe (3), which is electrically connected to the controller (1). The pressure sensor (16) is used to detect the state of the diaphragm. The water flow pressure at the inlet side of the diaphragm in the pipeline (3) is transmitted to the controller (1); the controller (1) is pre-set with a diaphragm periodic dry operation fatigue detection program, a diaphragm sudden dry operation fatigue detection program, a diaphragm cavitation initial detection program based on inlet conditions, and a diaphragm fatigue detection program under simulated fluctuating liquid level; the diaphragm periodic dry operation fatigue detection program includes the following steps: S1, control the water pump (7) to start, and control the drive component (4) to drive the push-pull force gauge (5) to pre-press the diaphragm, so that the diaphragm is in a preset initial deformation state, and then control the drive component (4) to drive the push-pull force gauge (5) to rise or fall, so that the push-pull force gauge (5) drives the middle part of the diaphragm to rise or fall;S2. Perform a periodic dry-run simulation cycle: Control the drive device (10) to drive the water inlet end of the water inlet pipe (18) to gradually rise from the fully submerged state at a first constant speed until the water inlet end of the water inlet pipe (18) leaves the test liquid surface and reaches the corresponding position and remains for a preset time. Then control the drive device (10) to drive the water inlet end of the water inlet pipe (18) to descend at a second constant speed to re-immerse in the test liquid and remain for a preset time. S3. Determine whether the diaphragm is damaged based on the image information transmitted by the high-speed camera (15). When the diaphragm is damaged, control the machine to stop. The diaphragm sudden dry-run fatigue detection program includes the following steps: S1. Control the water pump (7) to start and control the water pump (7) to start. The driving component (4) drives the push-pull force gauge (5) to pre-compress the diaphragm, so that the diaphragm is in a preset initial deformation state. Then, the driving component (4) controls the driving component (4) to drive the push-pull force gauge (5) to rise or fall, so that the push-pull force gauge (5) drives the middle part of the diaphragm to rise or fall. S2, execute a sudden dry running simulation cycle: control the driving device (10) to drive the water inlet end of the water inlet pipe (18) to rise rapidly from the fully submerged state at a preset speed, so that the water inlet end of the water inlet pipe (18) is removed from the liquid surface and held for a preset time. Then, the controller (1) controls the driving device (10) to drive the water inlet end of the water inlet pipe (18) to fall at a constant speed to re-immerse in the test liquid and hold for a preset time. S3. Determine whether the diaphragm is damaged based on the image information transmitted by the high-speed camera (15). If the diaphragm is damaged, control the machine to stop. The diaphragm cavitation initial detection procedure based on inlet condition adjustment includes the following steps: S1. Control the water pump (7) to start and control the drive component (4) to drive the push-pull force gauge (5) to pre-press the diaphragm, so that the diaphragm is in a preset initial deformation state. Then control the drive component (4) to drive the push-pull force gauge (5) to rise or fall, so that the push-pull force gauge (5) can be pushed up or down. The tension gauge (5) drives the middle part of the diaphragm to rise or fall; S2, control the driving device (10) to drive the water inlet end of the water inlet pipe (18) to be immersed in the test liquid, the water inlet end of the water inlet pipe (18) is located at a preset initial depth of the test liquid and is maintained for a preset time, then control the driving device (10) to drive the water inlet end of the water inlet pipe (18) to rise at a constant speed, so that the water inlet end of the water inlet pipe (18) sequentially reaches a plurality of preset and progressively decreasing immersion depths and is maintained for a preset time; S3, according to When the pressure sensor (16) transmits information indicating periodic pressure fluctuations and the high-speed camera (15) transmits image information indicating bubble generation on the diaphragm, the system is shut down. The simulated fluctuating liquid level diaphragm fatigue detection program includes the following steps: S1, control the water pump (7) to start and control the drive unit (4) to drive the push-pull force gauge (5) to pre-press the diaphragm, so that the diaphragm is in a preset initial deformation state. Then, control the drive unit (4) to drive the push-pull force gauge (5) to rise or fall, so that the push-pull force gauge (5) drives the middle part of the diaphragm to rise or fall. S2, control the drive device (10) to drive the water inlet end of the water inlet pipe (18) to be immersed in the test liquid and maintain it for a preset time. Then, control the drive device (10) to drive the water inlet end of the water inlet pipe (18) to move up and down reciprocally below the test liquid surface. S3, determine whether the diaphragm is damaged based on the image information transmitted by the high-speed camera (15). When the diaphragm is damaged, the system is shut down.

2. The multi-condition testing device for diaphragms according to claim 1, characterized in that: The water inlet pipe (18) is provided with a corrugated section (11) in the middle. The output end of the driving device (10) is connected to the end of the water inlet pipe (18). The driving device (10) is used to drive the water inlet pipe (18) so that the corrugated section (11) expands or retracts. When the corrugated section (11) expands, the water inlet end of the water inlet pipe (18) is immersed in the test liquid. When the corrugated section (11) is completely retracted, the water inlet end of the water inlet pipe (18) is removed from the test liquid.

3. The multi-condition testing device for diaphragms according to claim 2, characterized in that: The drive device (10) includes a servo motor (101), a lead screw (102), a nut (103), a slide rail (104), and a slider (105). The servo motor (101) is electrically connected to the controller (1). The controller (1) can control the rotation speed of the servo motor (101). The output end of the servo motor (101) is connected to the lead screw (102). The nut (103) is threadedly connected to the lead screw (102). The slider (105) is slidably mounted on the slide rail (104). The nut (103) is connected to the slider (105). The inlet end of the water inlet pipe (18) is detachably connected to a linkage sleeve (12). The linkage sleeve (12) is provided with a connecting part (13). The connecting part (13) is connected to the slider (105).

4. A multi-condition testing device for diaphragms according to any one of claims 1, 2, or 3, characterized in that: The clamp (6) includes an annular base (61) and a clamping ring (62). The annular base (61) is disposed in the mounting port (8), and the clamping ring (62) is threadedly connected in the mounting port (8). The clamping ring (62) can cooperate with the annular base (61) to clamp the diaphragm. The upper surface of the annular base (61) and the lower surface of the clamping ring (62) are both provided with sealing rings (17).

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