Sealing performance detection device of penetration type bidirectional sealing knife gate valve

Abstract

The invention relates to the technical field of knife gate valve sealing performance detection, and particularly discloses a sealing performance detection device of a penetration type bidirectional sealing knife gate valve, which comprises a transparent detection box fixedly connected to a valve body, the bottom wall of the detection box is communicated with a capillary tube extending into the valve body, and a water permeable net is arranged in the detection box. A mixing layer formed by mixing water-absorbent resin and anhydrous cupric sulfate is contained in one cavity between the detection box and the permeable net, a water outlet is formed in the bottom of the side, away from the mixing layer, of the permeable net of the detection box, and a color sensor right opposite to the mixing layer in the detection box is fixedly connected to the valve body. A controller electrically connected with the color sensor is fixedly connected to the valve body. The valve body is further provided with a gas supply assembly used for introducing high-pressure gas into the sealing cavity, the detection box is internally provided with a constant-pressure assembly used for keeping the pressure in the detection box constant to be equal to the pressure in the sealing cavity, and the detection box is further internally provided with a sealing piece used for blocking the water outlet. The device has the effect of detecting the sealing performance of the inner sealing ring in real time.

Description

Technical Field

[0001] The present application relates to the technical field of knife gate valve sealing detection, and in particular to a sealing detection device for a penetrating bidirectional sealing knife gate valve. Background Art

[0002] Knife gate valve is also called knife-type gate valve, knife gate valve, slurry valve, mud valve. Its opening and closing parts are gate plates. The movement direction of the gate plates is perpendicular to the direction of the fluid. The medium is cut off by the blade-shaped gate plate that can cut the fiber material. The two-way sealed knife gate valve can seal both ends of the valve plate. It is commonly used in water treatment, mining, chemical, papermaking and other industries.

[0003] The knife gate valve body comprises two valve bodies facing each other and threadedly connected, a valve plate slidably connected in a sliding cavity reserved in the two valve bodies (81), a valve stem connected to the valve plate (82), and the valve stem can be driven by a hydraulic cylinder (83) or the like, thereby adjusting the opening and closing of the valve plate (82). The valve body (81) of the penetrating knife gate valve is relatively long, and both ends of the valve plate (82) extend out of the valve body (81). The junction between the two ends of the valve body (81) and the valve plate (82) is formed by a packing disk ( The valve body (81) and the valve plate (82) are sealed by an inner sealing ring (85) between the valve body (81) and the valve plate (82) at the valve hole. An outer sealing ring (86) having a larger size than the inner sealing ring (85) is generally added outside the peripheral wall of the inner sealing ring (85) and inside the two valve bodies (81), so that a sealing cavity (87) is formed between the inner sealing ring (85), the outer sealing ring (86) and the valve body (81), so as to achieve multi-stage sealing of the valve body (81).

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: when the knife gate valve is used for a long time or is used in an environment with relatively harsh working conditions, it is generally manually checked periodically to see if there is any water leakage at the packing disk (84). However, when the staff finds that there is water leakage at the packing disk (84), it means that the inner sealing ring (85), the outer sealing ring (86) and the packing disk (84) are all damaged, and the damage time of the inner sealing ring (85) and the outer sealing ring (86) is long and the degree of damage is high. At this time, the maintenance cost of the knife gate valve is high, and the leakage of liquid will also bring other adverse effects. Summary of the invention

[0005] In order to improve the problem of difficulty in detecting the sealing performance of an inner sealing ring, the present application provides a sealing performance detection device for a penetrating bidirectional sealing knife gate valve.

[0006] The present application provides a sealing detection device for a penetrating bidirectional sealing knife gate valve adopts the following technical solution: A sealing detection device for a penetrating bidirectional sealing knife gate valve, comprising a transparent detection box fixedly connected to a valve body, the bottom wall of the detection box being connected to a capillary extending into the valve body, and one end of the capillary away from the detection box being located at the lowest point of an outer sealing ring, a water-permeable net being arranged in the detection box, a mixed layer of a water-absorbing resin and anhydrous copper sulfate being accommodated in one of the cavities between the detection box and the water-permeable net, a drain port being arranged at the bottom of a side of the water-permeable net away from the mixed layer in the detection box, a transparent water collecting bucket being connected to the drain port in the detection box, a color sensor facing the mixed layer in the detection box being fixedly connected to the valve body, and a controller electrically connected to the color sensor being fixedly connected to the valve body; The valve body is also provided with a gas supply component for introducing high-pressure gas into the sealing cavity. The detection box is provided with a constant pressure component for keeping the pressure in the detection box equal to the pressure in the sealing cavity. The detection box is also provided with a sealing member for sealing the drain port.

[0007] By adopting the above technical solution, the air supply component injects high-pressure gas into the sealing cavity, and the constant pressure component keeps the pressure difference between the sealing cavity and the detection box always at zero. In the process of opening and closing the valve plate, the valve plate will stretch the inner sealing ring on its path, which may easily lead to the formation of small holes between the two inner sealing rings and the valve plate. However, due to the high pressure in the sealing cavity, the gas will flow out from the small holes and prevent the liquid in the valve hole from flowing into the sealing cavity, so as to avoid the opening and closing of the valve plate from causing errors in the process of detecting water leakage; when the water at the valve hole breaks through the inner sealing ring and penetrates into the outer sealing ring, the capillary draws the liquid into the detection box through capillary action and gradually spreads to the mixed layer through the permeable net. When the mixed layer meets water, the water-absorbing resin absorbs water and expands, and at the same time, anhydrous sulfuric acid Copper also reacts with water to produce copper sulfate pentahydrate, which turns blue. The color sensor detects the change in color of the mixed layer in the test box and feeds back to the controller. The controller then prompts the staff of the current situation. No matter where the leak occurs, the high-pressure gas in the sealed cavity will also leak. At this time, when the gas and water leak, a sizzling sound will be made to remind the staff of the location of the leak. When the mixed layer absorbs a lot of water, the volume of the water-absorbing resin in the mixed layer also expands significantly, causing the constant pressure component to stop maintaining the air pressure between the test box and the sealed cavity. The seal opens, and the high-pressure gas in the sealed cavity accelerates the liquid in the sealed cavity to flow from the capillary to the test box, and flows out from the drain port of the test box, thereby accelerating the drainage efficiency in the sealed cavity.

[0008] Optionally, the air supply assembly includes a gas tank fixedly connected to the valve body, an electric gas valve connected to the gas tank, and a pressurized pipe connected to the electric gas valve, the electric gas valve is electrically connected to the controller, the pressurized pipe extends into the sealed cavity, and the pressurized pipe is also connected to an air pressure sensor electrically connected to the controller.

[0009] By adopting the above technical scheme, the controller controls the electric gas valve to open, and the high-pressure gas in the gas tank enters the sealed cavity through the pressurized pipe; when the inner sealing ring leaks, if the leaking hole is small, the gas flows out from the leaking hole and prevents the external liquid from entering the sealed cavity; if the leaking hole is large or the gas leaks too much, causing the pressure in the sealed cavity to decrease too much, the gas flows out from the leaking hole while the liquid also flows into the sealed cavity from the leaking hole, and when the seal is opened, the gas will also squeeze the liquid in the sealed cavity to flow from the capillary into the detection box and be discharged from the drain port of the detection box. Regardless of which step is taken, the pressure value fed back by the air pressure sensor will decrease faster, and then the controller will also feed back to the staff. The air pressure sensor cooperates with the color sensor, so that the controller can more accurately and promptly feed back the leakage to the staff, avoiding the leakage event that lasts too long and causes more serious effects.

[0010] Optionally, the valve body is fixedly connected to a plurality of adjustment boxes in the sealing cavity, the adjustment box is slidably connected with a pressure plate, one end of the pressure plate is fixedly connected to a push-pull rod, and the push-pull rods on the same side are also commonly fixed with an adjustment ring corresponding to the inner sealing ring, an elastic telescopic rod is fixedly connected between the end of the pressure plate away from the adjustment ring and the inner wall of the adjustment box, the electric air valve is a three-way valve, and an adjustment tube is connected between the adjustment boxes, and the adjustment tube is also connected to the electric air valve, and when the elastic telescopic rod is in a free state, the adjustment ring presses the inner sealing ring.

[0011] By adopting the above technical scheme, when the valve plate is in an open or closed state, the elastic telescopic rod squeezes the pressure plate, so that the push-pull rod pushes the adjusting ring to squeeze the inner sealing ring, thereby making the inner sealing ring and the inner sealing ring or the inner sealing ring and the valve plate fit more tightly. Before the staff controls the opening and closing of the valve plate through the controller, the controller first controls the electric air valve to open the channel between the regulating tube and the air pipe, thereby allowing high-pressure gas to enter the regulating box through the regulating tube. At this time, the air pressure pushes the pressure plate to squeeze the elastic telescopic rod, thereby making the push-pull rod pull the adjusting ring to move away from the valve plate, so that the adjusting ring releases the squeezing of the inner sealing ring, so that the inner sealing ring can be sealed only by its own elasticity, so as to facilitate the smooth opening and closing of the valve plate and avoid damage to the inner sealing ring caused by excessive friction between the inner sealing ring and the valve plate.

[0012] Optionally, the constant pressure assembly includes a constant pressure tube connected to the detection box, a constant pressure plug slidably connected to the detection box at the constant pressure tube, a spring sleeved on the constant pressure plug and a fixed ring fixed in the constant pressure tube, the two ends of the spring are respectively fixed to the fixed ring and the constant pressure plug, when the spring is in a free state, the constant pressure plug is not in contact with the constant pressure tube, when the constant pressure plug is pressed against the fixed ring, the constant pressure plug blocks the fixed ring, and a filter cloth is also pasted in the detection box to cover the top of the constant pressure plug.

[0013] By adopting the above technical scheme, the filter cloth prevents particles in the mixed layer from falling from the constant pressure tube, and also prevents particles from interfering with the closure of the constant pressure plug; when there is less water in the sealing cavity and water has not entered the mixed layer from the capillary, the spring squeezes the constant pressure plug until the constant pressure plug does not block the fixing ring. At this time, the detection box and the sealing cavity are the same system, which prevents the pressure in the detection tube from being greater than the pressure in the sealing cavity when the liquid level in the capillary rises, causing the capillary to be unable to transport water smoothly; when the mixed layer expands, the mixed layer squeezes the constant pressure plug to block the fixing ring, and at the same time the seal closes the sealing function. At this time, the detection box is connected to the outside world, that is, the pressure in the sealing cavity is greater than the pressure in the detection box, thereby accelerating the discharge rate of water in the sealing cavity.

[0014] Optionally, an ultrasonic transceiver is fixedly connected to the valve body corresponding to the lowest point of the outer sealing ring, and the ultrasonic transceiver is electrically connected to the controller.

[0015] By adopting the above technical solution, the ultrasonic transceiver periodically emits ultrasonic waves, and detects whether water leakage occurs in the valve body by receiving the changes in the returned ultrasonic waves. At the same time, the emitted ultrasonic waves act on the capillary tube, effectively enhancing the capillary action of the capillary tube, thereby preventing the liquid leaking to the outer sealing ring from being difficult to be capillary into the detection box due to reduced wettability due to some factors. However, the ultrasonic transceiver is greatly affected by the environmental humidity, temperature, etc., so the ultrasonic transceiver is combined with the above-mentioned other detection methods to ensure that when accidents occur in some of the detection processes, the staff can still receive the water leakage signal.

[0016] Optionally, the water-permeable net is slidably connected in the detection box, and the sealing member is a sealing plate slidably connected in the detection box, and the sealing plate is fixedly connected to the water-permeable net.

[0017] By adopting the above technical solution, when the mixed layer expands, the water-permeable net moves toward the sealing plate. During this process, the water-permeable net pushes the sealing plate, and then the sealing plate fails to close the drainage port.

[0018] Optionally, a water-conducting cotton strip is inserted into the capillary tube, one end of the water-conducting cotton strip passes through the water-permeable net and extends into the mixed layer, and the other end of the water-conducting cotton strip extends to the outside of the capillary tube and is wound into a ball to fit the outer sealing ring.

[0019] By adopting the above technical solution, the water-conducting cotton strips in the capillary further enhance the capillary phenomenon of water, and the water transported to the detection box is also smoothly introduced into the mixed layer by the water-conducting cotton strips. The water-conducting cotton strips clustered in the sealing cavity can not only prevent impurities from blocking the capillary, but also increase the capillary range.

[0020] Optionally, a humidity sensor is fixedly connected to the valve body, and a water-conducting cotton strip is also filled between the surface of the packing disk and the valve plate, and a probe of the humidity sensor is inserted into the water-conducting cotton strip.

[0021] By adopting the above technical solution, when during the opening and closing process of the valve plate, some relatively small and sharp debris cuts the inner sealing ring and the outer sealing ring in a short time, and the stuffing tray has a poor waterproof effect due to disrepair, the water leaked from the stuffing tray is first guided to the humidity sensor by the water-guiding cotton strip. After the humidity sensor detects that the water content of the water-guiding cotton strip is high, it quickly feeds back to the controller, and then promptly feeds back to the staff, so that the staff can quickly receive the leakage situation at the stuffing tray.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the inner sealing ring leaks, if the leaking hole is small, the gas flows out from the leaking hole and prevents the external liquid from entering the sealing cavity. If the leaking hole is large or the gas leaks too much, causing the pressure in the sealing cavity to decrease too much, the gas flows out from the leaking hole while the liquid also flows into the sealing cavity from the leaking hole. At this time, the capillary transports the water into the detection box and guides it to the mixed layer by the water-conducting cotton strip. When the mixed layer expands and changes color when it encounters water, the color sensor receives the signal and feeds back to the controller, which then reminds the staff. At the same time, the constant pressure plug seals the fixed ring and the sealing plate seals the drain port. The high-pressure gas in the sealing cavity squeezes the liquid in the sealing cavity to flow from the capillary into the detection box and is discharged from the drain port of the detection box to temporarily drain the water and avoid other effects caused by excessive water accumulation in the sealing cavity. 2. When the valve plate is stationary, the adjusting ring squeezes the inner sealing ring, so that the inner sealing rings and the inner sealing rings or the inner sealing rings and the valve plate fit more closely, so as to further enhance the sealing performance; 3. The ultrasonic transceiver periodically emits ultrasonic waves, and detects whether there is water leakage in the valve body by receiving the changes in the returned ultrasonic waves. At the same time, the emitted ultrasonic waves act on the capillary tube, effectively enhancing the capillary action of the capillary tube, and preventing the liquid leaking to the outer sealing ring from being difficult to be absorbed into the detection box due to the decrease in wettability caused by some factors. However, the ultrasonic transceiver is greatly affected by the environmental humidity, temperature, etc., so the ultrasonic transceiver is combined with the above-mentioned other detection methods to ensure that when some accidents occur during the detection process, the staff can still receive the water leakage signal; 4. When the valve plate is opened and closed, some relatively small and sharp debris may scratch the inner and outer sealing rings in a short time, and the packing tray has poor waterproof effect due to disrepair. The water leaked from the packing tray will be guided to the humidity sensor by the water-guiding cotton strip first. After the humidity sensor detects that the water content of the water-guiding cotton strip is high, it will quickly feedback to the controller, and then to the staff in time, so that the staff can quickly receive the leakage situation at the packing tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a partial structural schematic diagram of the present application when the valve body on one side is hidden; Figure 3 It is mainly used to show the structural diagram of the detection box, permeable net, mixing layer, drain port, water collection bucket, filter cloth, sealing plate and constant pressure assembly; Figure 4 This application is mainly used to show the structural schematic diagram of the regulating box, the pressure plate, the push-pull rod, the regulating ring, the elastic telescopic rod, the regulating tube, the valve body, the valve plate, the inner sealing ring and the sealing chamber; Figure 5 yes Figure 3 Enlarged schematic diagram of part A.

[0024] 1. Detection box; 11. Water-permeable net; 12. Mixing layer; 13. Drain; 14. Water collecting bucket; 15. Filter cloth; 16. Sealing plate; 2. Capillary tube; 31. Controller; 32. Color sensor; 33. Ultrasonic transceiver; 34. Humidity sensor; 4. Air supply assembly; 41. Air tank; 42. Electric air valve; 43. Pressurizing pipe; 44. Air pressure sensor; 5. Constant pressure assembly; 51. Constant pressure pipe; 52. Constant pressure plug; 53. Spring; 54. Fixed ring; 61. Adjustment box; 62. Pressure plate; 63. Push-pull rod; 64. Adjustment ring; 65. Elastic telescopic rod; 66. Adjustment pipe; 7. Water-guiding cotton strip; 81. Valve body; 82. Valve plate; 83. Hydraulic cylinder; 84. Stuffing plate; 85. Inner sealing ring; 86. Outer sealing ring; 87. Sealing chamber. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-5 This application is described in further detail.

[0026] The present application embodiment discloses a sealing detection device for a penetrating bidirectional sealing knife gate valve. Figure 1 , Figure 2 and Figure 3The sealing detection device of the penetrating bidirectional sealing knife gate valve includes a transparent detection box 1 fixedly connected to the valve body 81, the bottom wall of the detection box 1 is connected with a capillary 2 extending into the valve body 81, and the end of the capillary 2 away from the detection box 1 is located at the lowest point of the outer sealing ring 86, a water-permeable net 11 is slidably connected in the detection box 1, and a mixed layer 12 of a semi-transparent water-absorbing resin and anhydrous copper sulfate is contained in one of the cavities between the detection box 1 and the water-permeable net 11, a drain port 13 is opened at the bottom of the side of the water-permeable net 11 away from the mixed layer 12 of the detection box 1, and the detection box 1 is connected with a transparent water collecting bucket 14 at the drain port 13, a color sensor 32 facing the mixed layer 12 in the detection box 1 is fixedly connected to the valve body 81, a controller 31 electrically connected to the color sensor 32 is fixedly connected to the valve body 81, and the controller 31 is also electrically connected to the hydraulic cylinder 83.

[0027] The valve body 81 is also provided with a gas supply component 4 for introducing high-pressure gas into the sealing chamber 87. The detection box 1 is provided with a constant pressure component 5 for keeping the pressure in the constant detection box 1 equal to the pressure in the sealing chamber 87. The detection box 1 is also provided with a sealing member for sealing the drain outlet 13. The sealing member is a sealing plate 16 that is slidably connected to the detection box 1, and the sealing plate 16 is fixedly connected to the water-permeable net 11.

[0028] The air supply component 4 injects high-pressure gas into the sealed cavity 87, and the constant pressure component 5 keeps the pressure difference between the sealed cavity 87 and the detection box 1 always zero. During the opening and closing of the valve plate 82, the valve plate 82 will stretch the inner sealing ring 85 on its path, which may easily lead to the formation of a small hole between the two inner sealing rings 85 and the valve plate 82. However, due to the high pressure in the sealed cavity 87, the gas will flow out from the small hole and prevent the liquid in the valve hole from flowing into the sealed cavity 87, thereby preventing the opening and closing of the valve plate 82 from causing errors in the process of detecting water leakage; when the water at the valve hole breaks through the inner sealing ring 85 and penetrates into the outer sealing ring 86, the capillary 2 draws the liquid into the detection box 1 through capillary action and gradually spreads to the mixed layer 12 through the permeable net 11. When the mixed layer 12 encounters water, the water-absorbing resin absorbs water and expands. At the same time, anhydrous copper sulfate also reacts with water to generate copper sulfate pentahydrate and turns blue. The color sensor 32 detects the change in color of the mixed layer 12 in the detection box 1 and then feeds back to the controller 31. The controller 31 then prompts the staff of the current status. No matter where the leak occurs, the high-pressure gas in the sealed cavity 87 will also leak. At this time, when the gas and water leak, a sizzling sound will be emitted to remind the staff of the location of the leak. When the mixed layer 12 absorbs a lot of water, the volume of the water-absorbing resin in the mixed layer 12 also expands significantly, causing the constant pressure component 5 to stop maintaining the air pressure between the detection box 1 and the sealed cavity 87. The expanded mixed layer 12 pushes the permeable net 11, thereby causing the sealing plate 16 to open the drain port 13. The high-pressure gas in the sealed cavity 87 accelerates the liquid in the sealed cavity 87 to flow from the capillary 2 to the detection box 1, and flows out from the drain port 13 of the detection box 1, thereby accelerating the drainage efficiency in the sealed cavity 87.

[0029] Reference Figure 2The air supply assembly 4 includes a gas tank 41 fixedly connected to the valve body 81, an electric air valve 42 connected to the gas tank 41, and a pressurizing pipe 43 connected to the electric air valve 42. The electric air valve 42 is electrically connected to the controller 31. The pressurizing pipe 43 extends into the sealed cavity 87. The pressurizing pipe 43 is also connected to a pressure sensor 44 electrically connected to the controller 31. The controller 31 controls the electric gas valve 42 to open, and the high-pressure gas in the gas tank 41 enters the sealed cavity 87 through the pressurized pipe 43; when the inner sealing ring 85 leaks, if the leaking hole is small, the gas flows out from the leaking hole and prevents the external liquid from entering the sealed cavity 87; if the leaking hole is large or the gas leaks too much, causing the pressure in the sealed cavity 87 to decrease too much, the gas flows out from the leaking hole while the liquid also flows into the sealed cavity 87 from the leaking hole, and when the seal is opened, the gas will also squeeze the liquid in the sealed cavity 87 to flow from the capillary 2 to the detection box 1, and be discharged from the drain port 13 of the detection box 1. Regardless of the step, the pressure value fed back by the air pressure sensor 44 will decrease faster, and then the controller 31 will also feed back to the staff. The air pressure sensor 44 cooperates with the color sensor 32, so that the controller 31 can more accurately and timely feed back the leakage to the staff, avoiding the leakage event from being too long and causing more serious effects.

[0030] Reference Figure 2 and Figure 4 The valve body 81 is fixedly connected with a plurality of regulating boxes 61 in the sealing cavity 87, and a pressure plate 62 is slidably connected in the regulating box 61. A push-pull rod 63 is fixedly connected to one end of the pressure plate 62, and an adjusting ring 64 corresponding to the inner sealing ring 85 is also fixedly connected to the push-pull rod 63 on the same side. An elastic telescopic rod 65 is fixedly connected between the end of the pressure plate 62 away from the adjusting ring 64 and the inner wall of the regulating box 61. The electric air valve 42 is a three-way valve. An adjusting tube 66 is connected between the regulating boxes 61 and the regulating boxes 61, and the adjusting tube 66 is also connected to the electric air valve 42. When the elastic telescopic rod 65 is in a free state, the adjusting ring 64 presses the inner sealing ring 85.

[0031] When the valve plate 82 is in the open or closed state, the elastic telescopic rod 65 squeezes the pressure plate 62, so that the push-pull rod 63 pushes the adjusting ring 64 to squeeze the inner sealing ring 85, thereby making the inner sealing ring 85 and the inner sealing ring 85 or the inner sealing ring 85 and the valve plate 82 fit more closely. Before the staff controls the opening and closing of the valve plate 82 through the controller 31, the controller 31 first controls the electric gas valve 42 to open the passage between the regulating tube 66 and the air pipe, thereby allowing the high-pressure gas to enter the regulating box 61 through the regulating tube 66. At this time, the air pressure pushes the pressure plate 62 to squeeze the elastic telescopic rod 65, thereby making the push-pull rod 63 pull the adjusting ring 64 to move away from the valve plate 82, so that the adjusting ring 64 releases the squeezing of the inner sealing ring 85, so that the inner sealing ring 85 is sealed only by its own elasticity, so as to facilitate the smooth opening and closing of the valve plate 82 and avoid excessive friction between the inner sealing ring 85 and the valve plate 82 to cause damage to the inner sealing ring 85.

[0032] Reference Figure 5 The constant pressure assembly 5 includes a constant pressure tube 51 connected to the detection box 1, a constant pressure plug 52 slidably connected to the detection box 1 at the constant pressure tube 51, a spring 53 sleeved on the constant pressure plug 52 and a fixing ring 54 fixedly connected to the constant pressure tube 51, and the two ends of the spring 53 are respectively fixedly connected to the fixing ring 54 and the constant pressure plug 52. When the spring 53 is in a free state, the constant pressure plug 52 is not in contact with the constant pressure tube 51. When the constant pressure plug 52 is pressed against the fixing ring 54, the constant pressure plug 52 blocks the fixing ring 54. A filter cloth 15 is also pasted in the detection box 1 to block the top of the constant pressure plug 52. The filter cloth 15 prevents particles in the mixed layer 12 from falling from the constant pressure tube 51, and also prevents particles from interfering with the closure of the constant pressure plug 52; when there is less water in the sealed cavity 87 and water has not entered the mixed layer 12 from the capillary 2, the spring 53 squeezes the constant pressure plug 52 until the constant pressure plug 52 does not block the fixing ring 54. At this time, the detection box 1 and the sealed cavity 87 are the same system, which prevents the pressure in the detection tube from being greater than the pressure in the sealed cavity 87 when the liquid level in the capillary 2 rises, causing the capillary 2 to be unable to transport water smoothly; when the mixed layer 12 expands, the mixed layer 12 squeezes the constant pressure plug 52 to block the fixing ring 54, and at the same time the seal closes the sealing function. At this time, the detection box 1 is connected to the outside world, that is, the pressure in the sealed cavity 87 is greater than the pressure in the detection box 1, thereby accelerating the discharge rate of water in the sealed cavity 87.

[0033] Reference Figure 2The valve body 81 is fixedly connected with an ultrasonic transceiver 33 corresponding to the lowest point of the outer sealing ring 86, and the ultrasonic transceiver 33 is electrically connected to the controller 31. The ultrasonic transceiver 33 periodically emits ultrasonic waves, and detects whether there is water leakage in the valve body 81 by receiving the changes of the returned ultrasonic waves. At the same time, the emitted ultrasonic waves act on the capillary 2, effectively enhancing the capillary action of the capillary 2, and preventing the liquid leaking to the outer sealing ring 86 from being difficult to be capillary into the detection box 1 due to the decrease in wettability caused by some factors. However, the ultrasonic transceiver 33 is greatly affected by the environmental humidity, temperature, etc., so the ultrasonic transceiver 33 cooperates with the above-mentioned other detection methods to ensure that when some accidents occur in some detection processes, the staff can still receive the water leakage signal.

[0034] Reference Figure 2 and Figure 3 A water-guiding cotton strip 7 is inserted into the capillary 2, one end of which penetrates the water-permeable net 11 and extends into the mixed layer 12, and the other end extends outside the capillary 2 and is wound into a ball to fit the outer sealing ring 86. The water-guiding cotton strip 7 in the capillary 2 further enhances the capillary phenomenon of the capillary 2 for water, and the water transported to the detection box 1 is also smoothly introduced into the mixed layer 12 by the water-guiding cotton strip 7, and the balled water-guiding cotton strip 7 in the sealing cavity 87 can not only prevent impurities from blocking the capillary 2, but also increase the capillary range.

[0035] Reference Figure 2 , a humidity sensor 34 is fixedly connected to the valve body 81, and a water-guiding cotton strip 7 is also filled between the surface of the packing disc 84 and the valve plate 82, and the probe of the humidity sensor 34 is inserted into the water-guiding cotton strip 7. When the valve plate 82 is opened and closed, some relatively small and sharp debris cuts the inner sealing ring 85 and the outer sealing ring 86 in a short time, and the packing disc 84 is also out of repair and has a poor waterproof effect, the water leaked from the packing disc 84 is first guided to the humidity sensor 34 by the water-guiding cotton strip 7. After the humidity sensor 34 detects that the water content of the water-guiding cotton strip 7 is high, it quickly feeds back to the controller 31, and then feeds back to the staff in time, so that the staff can quickly receive the water leakage situation at the packing disc 84.

[0036] The implementation principle of the sealing detection device of a penetrating bidirectional sealing knife gate valve in the embodiment of the present application is as follows: when the valve plate 82 needs to be opened and closed, the controller 31 first controls the electric gas valve 42 to open, and the high-pressure gas in the gas tank 41 enters the regulating box 61 through the regulating tube 66. At this time, the air pressure pushes the pressure plate 62 to squeeze the elastic telescopic rod 65, and then the push-pull rod 63 pulls the adjusting ring 64 to move away from the valve plate 82, so that the adjusting ring 64 releases the squeezing of the inner sealing ring 85, so that the inner sealing ring 85 is sealed only by its own elasticity, so that the valve plate 82 can be opened and closed smoothly; When the valve plate 82 is stationary, the controller 31 controls the electric valve 42 to change direction, so that the high-pressure gas in the regulating box 61 enters the sealed cavity 87, the elastic telescopic rod 65 rebounds, and the regulating ring 64 squeezes the inner sealing ring 85, so that the inner sealing ring 85 is squeezed by the regulating ring 64 to further enhance the sealing performance. After the air pressure between the regulating box 61 and the sealed cavity 87 is balanced, the controller 31 controls the electric valve 42, so that the high-pressure gas in the gas tank 41 enters the sealed cavity 87 through the pressurizing pipe 43; When the inner sealing ring 85 leaks, if the leaking hole is small, the gas flows out from the leaking hole and prevents the external liquid from entering the sealing chamber 87. If the leaking hole is large or the gas leaks too much, causing the pressure in the sealing chamber 87 to decrease too much, the gas flows out from the leaking hole while the liquid also flows into the sealing chamber 87 from the leaking hole. At this time, the capillary 2 transports the moisture into the detection box 1 and guides it to the mixed layer 12 by the water-guiding cotton strip 7. When the mixed layer 12 expands and changes color when it encounters water, the color sensor 32 receives the signal and feeds back to the controller 31, and then the controller 31 reminds the staff. At the same time, the constant pressure plug 52 blocks the fixing ring 54 and the sealing plate 16 seals the drain port 13. The high-pressure gas in the sealing chamber 87 squeezes the liquid in the sealing chamber 87 to flow from the capillary 2 to the detection box 1 and is discharged from the drain port 13 of the detection box 1 to temporarily drain the water and avoid other effects caused by excessive water accumulation in the sealing chamber 87. When the valve plate 82 is opened and closed, some relatively small and sharp debris may scratch the inner sealing ring 85 and the outer sealing ring 86 in a short time, and the stuffing tray 84 has a poor waterproof effect due to disrepair, the water leaked from the stuffing tray 84 is first guided to the humidity sensor 34 by the water-guiding cotton strip 7. After the humidity sensor 34 detects that the water content of the water-guiding cotton strip 7 is high, it quickly feeds back to the controller 31, and then feeds back to the staff in time, so that the staff can quickly receive the leakage information of the stuffing tray 84.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealing detection device for a penetrating bidirectional sealing knife gate valve, characterized in that: The invention comprises a transparent detection box (1) fixedly connected to a valve body (81), the bottom wall of the detection box (1) being connected to a capillary tube (2) extending into the valve body (81), and the end of the capillary tube (2) away from the detection box (1) being located at the lowest point of an outer sealing ring (86), the detection box (1) being provided with a water-permeable net (11), a mixed layer (12) of a water-absorbing resin and anhydrous copper sulfate being contained in one of the cavities between the detection box (1) and the water-permeable net (11), the detection box (1) being provided with a drainage port (13) at the bottom of a side of the water-permeable net (11) away from the mixed layer (12), and the detection box (1) being provided with a water-absorbing resin. The drain port (13) is connected to a transparent water collecting bucket (14); a color sensor (32) facing the mixed layer (12) in the detection box (1) is fixedly connected to the valve body (81); a controller (31) electrically connected to the color sensor (32) is fixedly connected to the valve body (81); a gas supply component (4) for introducing high-pressure gas into the sealed cavity (87) is also provided on the valve body (81); a constant pressure component (5) for keeping the pressure in the detection box (1) equal to the pressure in the sealed cavity (87) is provided in the detection box (1); and a sealing member for blocking the drain port (13) is also provided in the detection box (1); The air supply assembly (4) comprises an air tank (41) fixedly connected to the valve body (81), an electric air valve (42) connected to the air tank (41), and a pressurizing pipe (43) connected to the electric air valve (42), the electric air valve (42) being electrically connected to the controller (31), the pressurizing pipe (43) extending into the sealed cavity (87), and the pressurizing pipe (43) being further connected to a pressure sensor (44) electrically connected to the controller (31); The valve body (81) is fixedly connected to a plurality of regulating boxes (61) in a sealing cavity (87), a pressure plate (62) is slidably connected in the regulating box (61), one end of the pressure plate (62) is fixedly connected to a push-pull rod (63), and an regulating ring (64) corresponding to the inner sealing ring (85) is also fixedly connected to the push-pull rod (63) located on the same side, and an elastic telescopic rod (65) is fixedly connected between the end of the pressure plate (62) away from the regulating ring (64) and the inner wall of the regulating box (61), the electric air valve (42) is a three-way valve, and an regulating tube (66) is connected between the regulating boxes (61), and the regulating tube (66) is also connected to the electric air valve (42), and when the elastic telescopic rod (65) is in a free state, the regulating ring (64) presses the inner sealing ring (85).

2. According to claim 1, a sealing detection device for a penetrating bidirectional sealing knife gate valve is characterized in that: The constant pressure assembly (5) comprises a constant pressure tube (51) connected to the detection box (1), a constant pressure plug (52) slidably connected to the detection box (1) at the constant pressure tube (51), a spring (53) sleeved on the constant pressure plug (52), and a fixing ring (54) fixedly connected to the constant pressure tube (51), wherein two ends of the spring (53) are respectively fixedly connected to the fixing ring (54) and the constant pressure plug (52); when the spring (53) is in a free state, the constant pressure plug (52) is not in contact with the constant pressure tube (51); when the constant pressure plug (52) is pressed against the fixing ring (54), the constant pressure plug (52) blocks the fixing ring (54); and a filter cloth (15) is also pasted inside the detection box (1) to block the top of the constant pressure plug (52).

3. The sealing detection device for a penetrating bidirectional sealing knife gate valve according to claim 1 is characterized in that: An ultrasonic transceiver (33) is fixedly connected to the valve body (81) and corresponds to the lowest point of the outer sealing ring (86). The ultrasonic transceiver (33) is electrically connected to the controller (31).

4. The sealing detection device for a penetrating bidirectional sealing knife gate valve according to claim 1 is characterized in that: The water-permeable net (11) is slidably connected in the detection box (1); the sealing member is a sealing plate (16) slidably connected in the detection box (1); and the sealing plate (16) is fixedly connected to the water-permeable net (11).

5. The sealing detection device for a penetrating bidirectional sealing knife gate valve according to claim 1 is characterized in that: A water-conducting cotton strip (7) is inserted into the capillary tube (2), one end of the water-conducting cotton strip (7) passes through the water-permeable net (11) and extends into the mixed layer (12), while the other end extends outside the capillary tube (2) and is wound into a ball to fit the outer sealing ring (86).

6. The sealing detection device for a penetrating bidirectional sealing knife gate valve according to claim 1 is characterized in that: A humidity sensor (34) is fixedly connected to the valve body (81), and a water-conducting cotton strip (7) is also filled between the surface of the filling disk (84) and the valve plate (82), and a probe of the humidity sensor (34) is inserted into the water-conducting cotton strip (7).

Images