Check valve fault detection device for sewage treatment and check valve fault detection method

Abstract

The invention relates to the technical field of check valves, in particular to a check valve fault detection device for sewage treatment, which comprises a valve body, the lower part of the inner wall of the valve body is fixedly communicated with a water inlet pipe, the upper part of the inner wall of the valve body is fixedly communicated with a water outlet pipe, and the upper part of the inner wall of the valve body is in threaded connection with a valve cover; the inner wall, close to the water outlet pipe, of the valve body is fixedly connected with a valve plate. The invention further relates to a fault detection method for the check valve for sewage treatment, and the method comprises the following steps that S1, sewage passes through the water inlet pipe, the valve body, the filter screen and the valve plate and then impacts the valve clack, then the sewage flows out through the water outlet pipe, and the filter screen can filter impurities in the sewage. According to the check valve, the sealing condition in the valve body can be known in the first time, faults in the valve body can be detected and maintained in the first time, and the problems that in the prior art, a monitoring mechanism is arranged at an external water pump, the sealing performance of the check valve is determined through forward and reverse rotation of the water pump, the sealing performance condition of the check valve cannot be known in advance, and the water pump is prone to being damaged are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and in particular to a check valve fault detection device and a check valve fault detection method for sewage treatment. Background Art

[0002] A check valve is a valve whose opening and closing part is a circular disc and which relies on its own weight and medium pressure to produce a movement to block the backflow of the medium. In the sewage treatment pipe network system, check valves have many application scenarios.

[0003] In the sewage treatment process, in order to avoid the backflow of water in the pipeline, the check valve needs to have excellent sealing performance. However, when impurities in the sewage pass through the check valve, the impurities will inevitably adhere to the valve disc, causing the valve disc to contact the valve plate. At this time, the impurities located below the valve disc will block the contact between the valve disc and the valve plate, resulting in a loose seal between the two, causing water to flow back, and then causing the external water pump to rotate in the opposite direction, which can easily damage the water pump. In the existing technology, the sealing performance of the check valve is generally detected by setting a monitoring mechanism at the external water pump, and determining the sealing performance of the check valve by the forward and reverse rotation of the water pump. However, in actual use, when the sealing performance on the check valve is slightly reduced, the backflow of water is small and cannot impact the reverse rotation of the water pump. Only when the sealing performance on the check valve is very poor, the backflow of water is large, impacting the reverse rotation of the water pump, then the staff will not be able to know the sealing performance of the check valve in advance, which can easily cause damage to the water pump. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a check valve fault detection device and a check valve fault detection method for sewage treatment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A check valve fault detection device for sewage treatment, comprising: A valve body, wherein the lower portion of the inner wall of the valve body is fixedly connected to a water inlet pipe, the upper portion of the inner wall of the valve body is fixedly connected to a water outlet pipe, a valve cover is threadedly connected to the upper portion of the inner wall of the valve body, and a valve plate is fixedly connected to the inner wall of the valve body near the water outlet pipe; The detection mechanism includes a strip-shaped cavity opened on the valve cover, a slide is slidably connected to the inner wall of the strip cavity, the lower end of the slide is elastically connected to the bottom of the strip cavity through a plurality of first springs, the lower end of the slide is fixedly connected to the valve stem, the side wall of the valve stem passes through the bottom of the strip cavity, and the side wall of the valve stem is sealingly and slidably connected to the side wall of the valve cover, the lower end of the valve stem is fixedly connected to a valve flap that cooperates with the valve plate, the cross-section of the valve flap is T-shaped, the lower end of the valve flap is fixedly connected to a sealing ring, the side wall of the valve cover is fixedly connected to an alarm, and a trigger mechanism for triggering the alarm is provided in the strip cavity.

[0006] Preferably, the trigger mechanism includes a first pressure sensor fixedly connected to the upper end of the valve disc, a second pressure sensor is fixedly connected to the inner wall of the strip cavity below the slide, and a pressure block is fixedly connected to the lower end of the slide that is opposite to the second pressure sensor. The first pressure sensor and the second pressure sensor are electrically connected to the alarm through an external control mechanism.

[0007] Preferably, it also includes a filtering mechanism, which includes an annular groove opened in the valve body between the water inlet pipe and the valve plate, the inner wall of the annular groove is sealed and slidably connected to a circular ring that can move up and down, the lower end of the circular ring is elastically connected to the bottom of the annular groove through a plurality of second springs, the inner side wall of the circular ring is slidably connected to a circular plate that can rotate, two fan-shaped grooves are opened on the upper end of the circular plate, and the inner walls of the two fan-shaped grooves are fixedly connected to filter screens.

[0008] Preferably, a fan-shaped frame is fixedly connected to the lower end of the circular ring away from the water inlet pipe, the upper end of the fan-shaped frame is fitted with the lower end of the circular plate, and the fan-shaped frame is opposite to one of the fan-shaped grooves.

[0009] Preferably, the bottom of the fan-shaped frame is fixedly connected to a drain pipe, an electric butterfly valve is installed in the drain pipe, the side wall of the drain pipe passes through the bottom of the valve body, and the side wall of the drain pipe is sealed and slidably connected to the bottom of the valve body.

[0010] Preferably, a driving mechanism is provided on the valve body, and the driving mechanism includes a sealing frame fixedly connected to the upper inner wall of the annular groove, the top of the sealing frame is sealingly and rotatably connected to a vertical rod, the lower end of the vertical rod is fixedly connected to a gear, the side wall of the circular plate is fixedly connected to a rotating ring, and the outer side wall of the rotating ring is fixedly connected to a gear ring, and the gear ring engages with the gear during the upward movement.

[0011] Preferably, a rotating mechanism is provided on the valve cover, and the rotating mechanism includes a one-way bearing, a threaded cylinder is rotatably connected to the top of the strip cavity, the inner ring side wall of the one-way bearing is fixedly connected to the outer wall of the threaded cylinder, the upper end of the vertical rod passes through the top of the sealing frame and is fixedly connected to the first wheel, the outer ring side wall of the one-way bearing is fixedly connected to the second wheel, and a synchronous belt is connected between the first wheel and the second wheel.

[0012] Preferably, a rifle rod is fixedly connected to the upper end of the slide plate, and the side wall of the rifle rod is threadedly connected to the inner wall of the threaded barrel.

[0013] Preferably, the water inlet pipe and the water outlet pipe are both arranged to be inclined downward.

[0014] A method for detecting a fault of a check valve for sewage treatment comprises the following steps: S1. Sewage passes through the water inlet pipe, valve body, filter screen, valve plate, impacts the valve disc, and then flows out through the water outlet pipe. The filter screen can filter impurities in the sewage; S2. When sewage flows back through the valve body, it enters from the outlet pipe, impacting the valve disc and moving it downward to close the valve plate, thus preventing sewage backflow. S3. When sewage impacts the valve disc, the first pressure sensor senses a pressure signal. Since the valve disc moves downward quickly, the valve stem drives the slide downward quickly. When the valve disc and valve plate are tightly fitted together via the sealing ring, the pressure block contacts and presses the second pressure sensor. As a result, the external control mechanism does not sound an alarm, indicating that the sealing inside the valve body is good. S4. When the valve disc and the valve plate cannot be tightly fitted together by the sealing ring, it means that impurities have accumulated at the lower end of the sealing ring. At this time, the pressure block cannot contact and squeeze the second pressure sensor, and then the alarm is sounded through the external control mechanism, indicating that the sealing inside the valve body is not good, reminding the staff to repair.

[0015] Compared with the existing technology, the advantages of the present invention are: 1. The detection mechanism and the trigger mechanism are provided to know the sealing condition of the valve body in the first time, and the fault in the valve body can be detected and repaired in the first time, avoiding the prior art of setting a monitoring mechanism at the external water pump and determining the sealing condition of the check valve by the forward and reverse rotation of the water pump, which makes it impossible to know the sealing condition of the check valve in advance and easily causes damage to the water pump.

[0016] 2. A filtering mechanism is provided. When sewage flows out of the valve body, the filter screen away from the fan-shaped frame can filter out impurities in the sewage to prevent the impurities in the sewage from clogging the inside of the valve body.

[0017] 3. The driving mechanism and the rotating mechanism are set up, and the two filters can be replaced according to the blockage of the filter far away from the fan-shaped frame, so as to achieve the effect of repeated filtration of sewage and automatic cleaning of the filter without manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a check valve fault detection device for sewage treatment proposed by the present invention; Figure 2 for Figure 1 A vertical cross-sectional structural diagram of ; Figure 3 for Figure 2 A schematic diagram of the structure at center A; Figure 4 for Figure 2 A magnified schematic diagram of the structure at B in the middle; Figure 5 for Figure 1 Schematic diagram of the top view structure; Figure 6 for Figure 5A magnified schematic diagram of the structure at C in the middle; Figure 7 for Figure 1 Schematic diagram of the structure of the filtering mechanism and the driving mechanism; Figure 8 for Figure 7 Schematic diagram of the structure viewed from above; Figure 9 for Figure 1 Schematic diagram of the rear view structure.

[0019] In the figure: 1. Valve body; 2. Water inlet pipe; 3. Water outlet pipe; 4. Valve cover; 5. Valve plate; 6. Strip cavity; 7. Slide plate; 8. First spring; 9. Valve stem; 10. Valve disc; 11. Sealing ring; 12. First pressure sensor; 13. Alarm; 14. Second pressure sensor; 15. Pressure block; 16. Annular groove; 17. Circular ring; 18. Second spring; 19. Circular plate; 20. Fan-shaped groove; 21. Filter screen; 22. Fan-shaped frame; 23. Drain pipe; 24. Electric butterfly valve; 25. Sealing frame; 26. Vertical rod; 27. Gear; 28. Rotating ring; 29. ​​Gear ring; 30. Threaded barrel; 31. One-way bearing; 32. First wheel; 33. Second wheel; 34. Synchronous belt; 35. Rifle rod. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Reference Figure 1 - Figure 9 A check valve fault detection device for sewage treatment includes a valve body 1, a water inlet pipe 2 is fixedly connected to the lower part of the inner wall of the valve body 1, and a water outlet pipe 3 is fixedly connected to the upper part of the inner wall of the valve body 1. The water inlet pipe 2 and the water outlet pipe 3 are both arranged downwardly at an angle, a valve cover 4 is threadedly connected to the upper part of the inner wall of the valve body 1, and a valve plate 5 is fixedly connected to the inner wall of the valve body 1 near the outlet pipe 3.

[0022] The detection mechanism includes a strip-shaped cavity 6 opened on the valve cover 4, and a slide plate 7 is slidably connected to the inner wall of the strip cavity 6. The lower end of the slide plate 7 is elastically connected to the inner bottom of the strip cavity 6 through a plurality of first springs 8. The lower end of the slide plate 7 is fixedly connected to a valve stem 9. The side wall of the valve stem 9 passes through the inner bottom of the strip cavity 6, and the side wall of the valve stem 9 is sealingly and slidably connected to the side wall of the valve cover 4. The lower end of the valve stem 9 is fixedly connected to a valve flap 10 that cooperates with the valve plate 5. The cross-section of the valve flap 10 is T-shaped, and the lower end of the valve flap 10 is fixedly connected to a sealing ring 11. The side wall of the valve cover 4 is fixedly connected to an alarm 13, and a trigger mechanism for triggering the alarm 13 is provided in the strip cavity 6.

[0023] The trigger mechanism includes a first pressure sensor 12 fixedly connected to the upper end of the valve disc 10, a second pressure sensor 14 fixedly connected to the inner wall of the strip cavity 6 below the slide 7, and a pressure block 15 fixedly connected to the lower end of the slide 7, which is opposite to the second pressure sensor 14. The first pressure sensor 12 and the second pressure sensor 14 are electrically connected to the alarm 13 through an external control mechanism.

[0024] It should be noted that when the first pressure sensor 12 senses a pressure signal, the second pressure sensor 14 senses a pressure signal at the same time, and the alarm 13 does not sound an alarm; When the first pressure sensor 12 senses a pressure signal, the second pressure sensor 14 does not sense a pressure signal, and the alarm 13 sounds an alarm.

[0025] After passing through the water inlet pipe 2, the valve body 1 and the valve plate 5, the sewage impacts the lower end of the valve disc 10. At this time, the valve disc 10 is separated from the valve plate 5 and then flows out through the outlet pipe 3. When the sewage flows back from the outlet pipe 3, the sewage will impact the upper end of the valve disc 10, causing the valve disc 10 to move downward and cooperate with the valve plate 5. When the sewage impacts the upper end of the valve disc 10, the first pressure sensor 12 senses a pressure signal. Since the valve disc 10 moves downward at a fast speed at this time, the valve stem 9 drives the slide plate 7 to move downward at a fast speed. When the valve disc 10 and the valve plate 5 are tightly fitted through the sealing ring 11, the pressure block 15 contacts and squeezes the second pressure sensor 14, and then the alarm 13 is not sounded through the external control mechanism, indicating that the sealing inside the valve body 1 is good; When the valve disc 10 and the valve plate 5 cannot be tightly fitted together through the sealing ring 11, it means that impurities have accumulated at the lower end of the sealing ring 11. At this time, the pressure block 15 cannot contact and squeeze the second pressure sensor 14, and then the alarm 13 is sounded through the external control mechanism, indicating that the sealing inside the valve body 1 is not good, reminding the staff to repair it. At this time, the staff only needs to rotate the valve cover 4 to separate the valve body 1, remove the valve disc 10 from the valve body 1, and clean the sealing ring 11; In this way, the sealing condition inside the valve body 1 can be known at the first time, and the fault inside the valve body 1 can be detected and repaired at the first time, avoiding the existing technology of setting a monitoring mechanism at the external water pump and determining the sealing of the check valve by the forward and reverse rotation of the water pump, which makes it impossible to know the sealing condition of the check valve in advance and easily causes damage to the water pump.

[0026] The filter mechanism also includes an annular groove 16 provided in the valve body 1 between the water inlet pipe 2 and the valve plate 5. The inner wall of the annular groove 16 is sealed and slidably connected to a ring 17 that can move up and down. The lower end of the ring 17 is elastically connected to the bottom of the annular groove 16 through a plurality of second springs 18. The inner wall of the ring 17 is slidably connected to a circular plate 19 that can rotate (such as Figure 7As shown), the upper end of the circular plate 19 is provided with two fan-shaped grooves 20, and the inner walls of the two fan-shaped grooves 20 are fixedly connected to the filter screen 21.

[0027] The lower end of the ring 17 away from the water inlet pipe 2 is fixedly connected to a fan-shaped frame 22, the upper end of the fan-shaped frame 22 is in contact with the lower end of the circular plate 19, and the fan-shaped frame 22 is aligned with one of the fan-shaped grooves 20 (as shown in FIG. Figure 4 As shown), when sewage flows out of the valve body 1, the filter screen 21 away from the fan-shaped frame 22 can filter impurities in the sewage to prevent the impurities in the sewage from clogging the inside of the valve body 1.

[0028] The bottom of the sector frame 22 is fixedly connected to a drain pipe 23 , in which an electric butterfly valve 24 is installed. The side wall of the drain pipe 23 passes through the bottom of the valve body 1 , and the side wall of the drain pipe 23 is sealed and slidably connected to the bottom of the valve body 1 .

[0029] When the electric butterfly valve 24 is opened, part of the sewage in the valve body 1 can be discharged through the fan-shaped frame 22 and the sewage pipe 23. At this time, the sewage can backflush the filter screen 21 opposite the fan-shaped frame 22, and the impurities accumulated under the filter screen 21 are flushed out through the sewage pipe 23, which is convenient for the subsequent replacement of the two filter screens 21. After a period of backflushing, the electric butterfly valve 24 can be closed without affecting the normal treatment and transportation of sewage.

[0030] The valve body 1 is provided with a driving mechanism, which includes a sealing frame 25 fixedly connected to the upper inner wall of the annular groove 16. The top of the sealing frame 25 is sealingly and rotatably connected to a vertical rod 26. The lower end of the vertical rod 26 is fixedly connected to a gear 27. The side wall of the circular plate 19 is fixedly connected to a rotating ring 28. The outer wall of the rotating ring 28 is fixedly connected to a gear ring 29. The gear ring 29 engages with the gear 27 during the upward movement.

[0031] When more impurities accumulate on the lower surface of the filter 21 away from the fan-shaped frame 22, the water permeability at the filter 21 decreases. At this time, the pressure in the valve body 1 continues to increase, thereby driving the ring 17 and the circular plate 19 to move upward, driving the gear ring 29 to move upward and engage with the gear 27.

[0032] A rotating mechanism is provided on the valve cover 4, which includes a one-way bearing 31. A threaded cylinder 30 is rotatably connected to the top of the strip cavity 6. The inner ring side wall of the one-way bearing 31 is fixedly connected to the outer wall of the threaded cylinder 30. The upper end of the vertical rod 26 passes through the inner top of the sealing frame 25 and is fixedly connected to the first wheel 32. The outer ring side wall of the one-way bearing 31 is fixedly connected to the second wheel 33. A synchronous belt 34 is connected between the first wheel 32 and the second wheel 33.

[0033] A rifle rod 35 is fixedly connected to the upper end of the slide plate 7 , and the side wall of the rifle rod 35 is threadedly connected to the inner wall of the threaded cylinder 30 .

[0034] It should be noted that when the skateboard 7 moves downward, the rifle rod 35 drives the threaded barrel 30 to rotate forward, and the inner ring of the one-way bearing 31 drives its outer ring to rotate. When the skateboard 7 moves upward, the rifle rod 35 drives the threaded barrel 30 to rotate in the opposite direction, and the inner ring of the one-way bearing 31 does not drive its outer ring to rotate.

[0035] When the gear ring 29 moves upward and meshes with the gear 27, it indicates that the lower surface of the filter screen 21 away from the sector frame 22 is seriously blocked. At this time, the sewage cannot flow normally, and the sewage in the outlet pipe 3 will flow back, driving the valve disc 10 to move downward, and driving the slide plate 7 to move downward through the valve stem 9. At this time, the rifle rod 35 drives the threaded barrel 30 to rotate forward. At this time, the inner ring of the one-way bearing 31 drives its outer ring to rotate, and then the outer ring of the one-way bearing 31 drives the vertical rod 26 to rotate through the second wheel 33, the synchronous belt 34 and the first wheel 32, and drives the gear ring 29 to rotate through the gear 27. When the valve disc 10 moves downward and meshes with the gear ring 29, the valve disc 10 rotates. When the valve plate 5 is in contact, the gear 27 just drives the gear ring 29 to rotate half a circle, and the rotating ring 28 drives the circular plate 19 to rotate half a circle, rotating the filter screen 21 that originally accumulated impurities into the fan-shaped frame 22, and rotating the filter screen 21 originally located in the fan-shaped frame 22 to the outside. At this time, the sewage in the valve body 1 will flow out through the filter screen 21 by itself, and then impact the valve disc 10 to move upward, so that the sewage flows out through the outlet pipe 3. At this time, the water pressure in the valve body 1 gradually returns to normal. Under the elastic action of the multiple second springs 18, the circular ring 17 is driven to move downward to the initial position. At this time, the gear 27 is separated from the gear ring 29; When the sewage impact valve disc 10 moves upward, the slide plate 7 moves upward, and the rifle rod 35 drives the threaded cylinder 30 to rotate in the opposite direction. At this time, the inner ring of the one-way bearing 31 does not drive its outer ring to rotate, and the position of the gear 27 will not be affected, so that the gear ring 29 can accurately and stably engage with the gear 27 when it moves upward later.

[0036] After the filter screen 21 that originally accumulated impurities rotates into the fan-shaped frame 22, the electric butterfly valve 24 is opened at this time, and part of the sewage in the valve body 1 can be discharged through the fan-shaped frame 22 and the sewage pipe 23. At this time, the sewage can backwash the filter screen 21 opposite to the fan-shaped frame 22, and the impurities accumulated under the filter screen 21 are flushed out through the sewage pipe 23, which is convenient for the subsequent replacement of the two filter screens 21, thereby achieving the effect of repeated filtration of sewage and automatic cleaning of the filter screen 21 without manual intervention.

[0037] A method for detecting a fault of a check valve for sewage treatment comprises the following steps: S1, sewage passes through the water inlet pipe 2, valve body 1, filter screen 21, valve plate 5 and impacts the valve disc 10, and then flows out through the water outlet pipe 3. The filter screen 21 can filter impurities in the sewage; S2. When sewage flows back in the valve body 1, sewage enters from the outlet pipe 3, impacting the valve disc 10 and moving it downward to close the valve plate 5, thus preventing sewage backflow. S3. When sewage impacts the valve disc 10, a pressure signal is sensed on the first pressure sensor 12. Since the valve disc 10 moves downward at a fast speed, the valve stem 9 drives the slide plate 7 to move downward at a fast speed. When the valve disc 10 and the valve plate 5 are tightly fitted together via the sealing ring 11, the pressure block 15 contacts and presses the second pressure sensor 14. As a result, the alarm 13 does not sound through the external control mechanism, indicating that the sealing inside the valve body 1 is good. S4. When the valve disc 10 and the valve plate 5 cannot be tightly fitted together by the sealing ring 11, it means that impurities have accumulated at the lower end of the sealing ring 11. At this time, the pressure block 15 cannot contact and squeeze the second pressure sensor 14, and then the alarm 13 is sounded through the external control mechanism, indicating that the sealing inside the valve body 1 is not good, reminding the staff to repair it.

[0038] When the check valve is in use, sewage passes through the water inlet pipe 2, the valve body 1, the filter screen 21, and the valve plate 5, and then impacts the lower end of the valve disc 10. At this time, the valve disc 10 separates from the valve plate 5 and then flows out through the water outlet pipe 3; When sewage flows back from the outlet pipe 3, the sewage will impact the upper end of the valve disc 10, causing the valve disc 10 to move downward and cooperate with the valve plate 5. When the sewage impacts the upper end of the valve disc 10, the first pressure sensor 12 senses a pressure signal. Since the valve disc 10 moves downward at a fast speed, the valve stem 9 drives the slide plate 7 to move downward at a fast speed. When the valve disc 10 and the valve plate 5 are tightly fitted together through the sealing ring 11, the pressure block 15 contacts and squeezes the second pressure sensor 14, and then the alarm 13 is not sounded through the external control mechanism, indicating that the sealing performance of the valve body 1 is good; When the valve disc 10 and the valve plate 5 cannot be tightly fitted together through the sealing ring 11, it means that impurities have accumulated at the lower end of the sealing ring 11. At this time, the pressure block 15 cannot contact and squeeze the second pressure sensor 14, and then the alarm 13 is sounded through the external control mechanism, indicating that the sealing inside the valve body 1 is not good, reminding the staff to repair it. At this time, the staff only needs to rotate the valve cover 4 to separate the valve body 1, remove the valve disc 10 from the valve body 1, and clean the sealing ring 11; In this way, the sealing condition of the valve body 1 can be known immediately, and any fault in the valve body 1 can be detected and repaired immediately, avoiding the prior art of setting a monitoring mechanism at the external water pump to determine the sealing condition of the check valve by the forward and reverse rotation of the water pump, which makes it impossible to know the sealing condition of the check valve in advance and easily causes damage to the water pump; When sewage flows in the valve body 1, the filter screen 21 away from the fan-shaped frame 22 can filter impurities in the sewage to prevent the impurities in the sewage from clogging the inside of the valve body 1; When there are more impurities accumulated on the lower surface of the filter screen 21 away from the sector frame 22, the water permeability at the filter screen 21 decreases. At this time, the pressure in the valve body 1 continues to increase, thereby driving the ring 17 and the circular plate 19 to move upward, driving the gear ring 29 to move upward and engage with the gear 27. When the gear ring 29 moves upward and engages with the gear 27, it indicates that the lower surface of the filter screen 21 away from the sector frame 22 is seriously blocked. At this time, the sewage cannot flow normally, and the sewage in the outlet pipe 3 will flow back, driving the valve disc 10 to move downward, and driving the slide plate 7 to move downward through the valve stem 9. At this time, the rifle rod 35 drives the threaded cylinder 30 to rotate forward. At this time, the inner ring of the one-way bearing 31 drives its outer ring to rotate, and then the outer ring of the one-way bearing 31 passes through the second wheel 33 and the synchronous The belt 34 and the first wheel 32 drive the vertical rod 26 to rotate, and the gear ring 29 is driven to rotate through the gear 27. When the valve disc 10 moves downward and fits the valve plate 5, the gear 27 just drives the gear ring 29 to rotate half a circle, and drives the circular plate 19 to rotate half a circle through the rotating ring 28, thereby rotating the filter screen 21 that originally accumulated impurities into the fan-shaped frame 22, and rotating the filter screen 21 originally located in the fan-shaped frame 22 to the outside. At this time, the sewage in the valve body 1 will flow out through the filter screen 21 by itself, thereby impacting the valve disc 10 to move upward, so that the sewage flows out through the outlet pipe 3. At this time, the water pressure in the valve body 1 gradually returns to normal. Under the elastic force of the multiple second springs 18, the circular ring 17 is driven to move downward to the initial position. At this time, the gear 27 is separated from the gear ring 29. When the sewage impact valve disc 10 moves upward, the slide plate 7 moves upward, and the rifle rod 35 drives the threaded cylinder 30 to rotate in the opposite direction. At this time, the inner ring of the one-way bearing 31 does not drive its outer ring to rotate, and the position of the gear 27 will not be affected, so that the gear ring 29 can accurately and stably engage with the gear 27 when it moves upward later.

[0039] After the filter screen 21 that originally accumulated impurities rotates into the fan-shaped frame 22, the electric butterfly valve 24 is opened at this time, and part of the sewage in the valve body 1 can be discharged through the fan-shaped frame 22 and the sewage pipe 23. At this time, the sewage can backflush the filter screen 21 opposite the fan-shaped frame 22, and the impurities accumulated under the filter screen 21 are flushed out through the sewage pipe 23, which is convenient for the subsequent replacement and use of the two filter screens 21. After a period of backflushing, the electric butterfly valve 24 can be closed, which will not affect the normal treatment and transportation of sewage, and achieve the effect of repeated filtration of sewage and automatic cleaning of the filter screen 21 without manual intervention.

[0040] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A check valve fault detection device for sewage treatment, characterized in that: include: A valve body (1), wherein the lower portion of the inner wall of the valve body (1) is fixedly connected to a water inlet pipe (2), the upper portion of the inner wall of the valve body (1) is fixedly connected to a water outlet pipe (3), a valve cover (4) is threadedly connected to the upper portion of the inner wall of the valve body (1), and a valve plate (5) is fixedly connected to the inner wall of the valve body (1) near the water outlet pipe (3); A detection mechanism, the detection mechanism includes a strip cavity (6) opened on the valve cover (4), the inner wall of the strip cavity (6) is slidably connected to a slide plate (7), the lower end of the slide plate (7) is elastically connected to the inner bottom of the strip cavity (6) through a plurality of first springs (8), the lower end of the slide plate (7) is fixedly connected to a valve stem (9), the side wall of the valve stem (9) passes through the inner bottom of the strip cavity (6), and the side wall of the valve stem (9) is sealingly slidably connected to the side wall of the valve cover (4), the lower end of the valve stem (9) is fixedly connected to a valve flap (10) matched with the valve plate (5), the cross section of the valve flap (10) is T-shaped, the lower end of the valve flap (10) is fixedly connected to a sealing ring (11), the side wall of the valve cover (4) is fixedly connected to an alarm (13), and a trigger mechanism for triggering the alarm (13) is provided in the strip cavity (6).

2. A sewage treatment check valve fault detection device according to claim 1, characterized in that: The trigger mechanism comprises a first pressure sensor (12) fixedly connected to the upper end of the valve flap (10); a second pressure sensor (14) is fixedly connected to the inner wall of the strip cavity (6) below the slide plate (7); a pressure block (15) facing the second pressure sensor (14) is fixedly connected to the lower end of the slide plate (7); and the first pressure sensor (12) and the second pressure sensor (14) are electrically connected to the alarm (13) via an external control mechanism.

3. A sewage treatment check valve fault detection device according to claim 1, characterized in that: The invention also includes a filtering mechanism, which includes an annular groove (16) provided in the valve body (1) between the water inlet pipe (2) and the valve plate (5), the inner wall of the annular groove (16) is sealingly and slidably connected to a circular ring (17) that can move up and down, the lower end of the circular ring (17) is elastically connected to the inner bottom of the annular groove (16) through a plurality of second springs (18), the inner side wall of the circular ring (17) is slidably connected to a circular plate (19) that can rotate, and the upper end of the circular plate (19) is provided with two fan-shaped grooves (20), and the inner walls of the two fan-shaped grooves (20) are fixedly connected to filter screens (21).

4. A sewage treatment check valve fault detection device according to claim 3, characterized in that: The lower end of the circular ring (17) away from the water inlet pipe (2) is fixedly connected to a fan-shaped frame (22), the upper end of the fan-shaped frame (22) is in contact with the lower end of the circular plate (19), and the fan-shaped frame (22) is directly opposite to one of the fan-shaped grooves (20).

5. A sewage treatment check valve fault detection device according to claim 4, characterized in that: The inner bottom of the fan-shaped frame (22) is fixedly connected to a sewage pipe (23), and an electric butterfly valve (24) is installed in the sewage pipe (23). The side wall of the sewage pipe (23) passes through the inner bottom of the valve body (1), and the side wall of the sewage pipe (23) is sealed and slidably connected to the inner bottom of the valve body (1).

6. A sewage treatment check valve fault detection device according to claim 3, characterized in that: The valve body (1) is provided with a driving mechanism, which includes a sealing frame (25) fixedly connected to the upper inner wall of the annular groove (16), a vertical rod (26) is sealingly and rotatably connected to the top of the sealing frame (25), a gear (27) is fixedly connected to the lower end of the vertical rod (26), a rotating ring (28) is fixedly connected to the side wall of the circular plate (19), and a gear ring (29) is fixedly connected to the outer wall of the rotating ring (28), and the gear ring (29) is meshed with the gear (27) during the upward movement.

7. A sewage treatment check valve fault detection device according to claim 6, characterized in that: The valve cover (4) is provided with a rotating mechanism, which includes a one-way bearing (31). The top of the strip cavity (6) is rotatably connected to a threaded cylinder (30). The inner ring side wall of the one-way bearing (31) is fixedly connected to the outer wall of the threaded cylinder (30). The upper end of the vertical rod (26) passes through the top of the sealing frame (25) and is fixedly connected to a first wheel (32). The outer ring side wall of the one-way bearing (31) is fixedly connected to a second wheel (33). A synchronous belt (34) is connected between the first wheel (32) and the second wheel (33).

8. A sewage treatment check valve fault detection device according to claim 7, characterized in that: The upper end of the slide plate (7) is fixedly connected to a rifle rod (35), and the side wall of the rifle rod (35) is threadedly connected to the inner side wall of the threaded barrel (30).

9. A sewage treatment check valve fault detection device according to claim 1, characterized in that: The water inlet pipe (2) and the water outlet pipe (3) are both arranged to be inclined downward.

10. A method for detecting a fault of a check valve for sewage treatment, comprising a device for detecting a fault of a check valve for sewage treatment as described in any one of claims 1 to 9, characterized in that: The following steps are also included: S1, sewage passes through the water inlet pipe (2), valve body (1), filter screen (21), valve plate (5), impacts the valve disc (10), and then flows out through the water outlet pipe (3). The filter screen (21) can filter impurities in the sewage; S2. When sewage flows back through the valve body (1), sewage enters from the outlet pipe (3), impacting the valve disc (10), causing it to move downward and close the valve plate (5), thus preventing sewage from flowing back. S3. When sewage impacts the valve disc (10), a pressure signal is sensed on the first pressure sensor (12). Since the valve disc (10) moves downward at a high speed, the valve stem (9) drives the slide plate (7) to move downward at a high speed. When the valve disc (10) and the valve plate (5) are tightly fitted together through the sealing ring (11), the pressure block (15) contacts and presses the second pressure sensor (14), and the alarm (13) is not sounded through the external control mechanism, indicating that the sealing performance of the valve body (1) is good. S4. When the valve disc (10) and the valve plate (5) cannot be tightly fitted together through the sealing ring (11), it indicates that impurities have accumulated at the lower end of the sealing ring (11). At this time, the pressure block (15) cannot contact and squeeze the second pressure sensor (14), and then the alarm (13) is sounded through the external control mechanism, indicating that the sealing inside the valve body (1) is not good, and reminds the staff to repair it.

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