A backflow prevention device for cable well

Abstract

The present invention discloses an anti-backflow device for a cable well, and relates to the technical field of cable well equipment. The fixed filter screen structure of the existing anti-backflow device is easily blocked due to the accumulation of mud and sand, which affects the drainage effect and increases the complexity of maintenance. The present invention includes a cable well body, an anti-backflow mechanism and a clearing mechanism; the anti-backflow mechanism includes a support shaft fixed inside the cable well body, and the first filter plate and the second filter plate are rotatably installed on the outside of the support shaft; a mud delivery cylinder is rotatably installed on both filter plates, and a plurality of liquid guide plates are fixedly installed on the mud delivery cylinder, and the liquid guide plate extends into the diversion channel at the bottom of the filter plate; the clearing mechanism includes a mud guide cylinder rotatably connected to the mud delivery cylinder, and a suspension plate is installed at the bottom of the mud guide cylinder; the angle change between the first filter plate and the second filter plate is controlled by the size of the water flow rate, so as to release water flows of different flow rates, so that the filter plate will not be fixed in a certain place for a long time to cause the mesh to be blocked, thereby improving the drainage effect and realizing the protection of the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cable well equipment, and in particular to a backflow prevention device used in a cable well. Background Art

[0002] A large number of cables and related equipment are usually installed in the cable well, which are very sensitive to moisture. Once backflow occurs in the cable well, moisture will directly contact the cables and equipment, which may cause serious consequences such as short circuit, insulation damage, equipment failure and even fire. Through anti-backflow measures, it can ensure that the cable well remains dry, thus protecting the cables and equipment from damage.

[0003] However, the existing anti-backflow device usually installs a fixed filter structure in the cable well to filter out sediment. However, the fixed filter structure will accumulate a lot of sediment on the surface during the long-term sediment filtering process, which can easily cause the filter to be blocked, thereby affecting the subsequent drainage effect of the water flow in the cable well. At the same time, the sediment accumulated on the surface of the filter structure needs to be cleaned manually, which increases the complexity of the internal maintenance of the cable well. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that a large amount of sediment will accumulate on the surface of the filter screen during the long-term filtering process, which may easily cause the filter screen to be blocked, thereby affecting the subsequent drainage effect of the water flow in the cable well, and propose an anti-backflow device for use in a cable well.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a backflow prevention device for a cable well: comprising a cable well body and a backflow prevention mechanism, and also comprising: a clearing mechanism suspended at the bottom of the backflow prevention mechanism driven by gravity;

[0006] The anti-backflow mechanism includes a support shaft fixed inside the cable well body, and the first filter plate and the second filter plate that can be elastically expanded according to the water flow rate are rotatably installed on the outside of the support shaft; a mud delivery cylinder is rotatably installed on both filter plates, and a plurality of liquid guide plates are fixedly installed on the mud delivery cylinder, and the liquid guide plates extend into the diversion channel at the bottom of the filter plate; the clearing mechanism includes a mud guide cylinder rotatably connected to the mud delivery cylinder, and a suspension plate is installed at the bottom of the mud guide cylinder;

[0007] The water flow carrying sediment is filtered through the two elastically connected filter plates, and the water flow is discharged from the diversion channel at the bottom of the filter plate. The water flow in the diversion channel impacts the liquid guide plate to rotate the mud conveying tube, and the sediment is discharged to the bottom of the suspension plate.

[0008] As a further description of the above technology, a backflow prevention device for a cable well is as follows:

[0009] At least one spring is fixedly installed between the first filter plate and the second filter plate. The anti-backflow mechanism also includes a flow limiting plate fixed on the first filter plate and the second filter plate, and the cross section of the flow limiting plate is a right-angle trapezoidal shape. A mud inlet groove is provided on the mud delivery tube between two adjacent liquid guide plates.

[0010] As a further description of the above technology, a backflow prevention device for a cable well is as follows:

[0011] A group of symmetrical spiral blades are fixedly mounted on the inner wall of the mud conveying tube. The mud and sand entering the mud conveying tube are driven by the spiral blades to convey the mud and sand out through the rotation of the mud conveying tube.

[0012] As a further description of the above technology, a backflow prevention device for a cable well is as follows:

[0013] The blockage clearing mechanism also includes a groove formed on the suspension plate, and a slide plate slidably connected to the inner wall of the groove is fixedly mounted on the mud guide cylinder.

[0014] As a further description of the above technology, a backflow prevention device for a cable well is as follows:

[0015] A baffle is fixed on the suspension plate at the groove, and a blocking plate is elastically connected to one side of the baffle.

[0016] As a further description of the above technology, a backflow prevention device for a cable well is as follows:

[0017] A power-assisting plate is fixed at the bottom of the suspension plate.

[0018] In summary, due to the use of the above-mentioned technology, the anti-backflow device for a cable well has the following beneficial effects:

[0019] By installing the elastically connected first filter plate and the second filter plate inside the cable well, when the water flow inside the cable well is low, the angle between the first filter plate and the second filter plate becomes slightly smaller, thereby filtering the sediment in the water flow in the cable well. When the surface mesh of the filter plate is blocked or the water flow inside the cable well increases, the impact force of the water flow on the first filter plate and the second filter plate becomes larger, thereby reducing the expansion angle between the first filter plate and the second filter plate, thereby increasing the gap between the filter plate and the cable well wall, and accelerating the discharge of the water flow accumulated inside the cable well. At the same time, the smaller angle between the two filter plates also changes the contact point between the water flow and the filter plate, thereby The water flow will come into contact with the unblocked filter plate mesh, thereby increasing the drainage rate; the filter plate will not be fixed in one place for a long time to cause mesh blockage, thereby improving the drainage effect and protecting the cables; in addition, the impact force of the water flow is used to transfer the mud and sand to the bottom of the suspended plate, thereby achieving the self-cleaning effect of the anti-backflow device, without the need for manual cleaning, and reducing the subsequent maintenance rate inside the cable well; then, when the water level inside the cable well rises, the suspended plate rises due to the buoyancy, driving the angle between the first filter plate and the second filter plate to increase, thereby sealing the inside of the cable well, thereby preventing backflow and protecting the cables in the cable well. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 3 It is a schematic diagram of the first filter plate structure of the present invention.

[0023] Figure 4 yes Figure 3 A magnified view of the structure at A.

[0024] Figure 5 It is a schematic diagram of the structure of the current limiting plate of the present invention.

[0025] Figure 6 It is a front view of the second filter plate structure of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the mud conveying tube of the present invention.

[0027] Figure 8 It is a partial structural cross-sectional view of the suspension board of the present invention.

[0028] Legend:

[0029] 10. Cable well;

[0030] 20. Anti-backflow mechanism; 21. First filter plate; 22. Second filter plate; 23. Support shaft; 24. Mud delivery tube; 25. Liquid guide plate; 26. Flow limiting plate; 27. Spiral blade; 28. Spring; 29. ​​Mud inlet trough;

[0031] 30. Blockage clearing mechanism; 31. Mud guide tube; 32. Suspension plate; 33. Groove; 34. Blocking plate; 35. Slide plate; 36. Power assist plate; 37. Baffle. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technology in the embodiments of the present invention, a backflow prevention device for a cable well. 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 creative work are within the scope of protection of the present invention.

[0033] like Figure 1-Figure 8 As shown, the present invention provides: a backflow prevention device for a cable well: comprising a cable well body 10 and a backflow prevention mechanism 20, and further comprising: a clearing mechanism 30 suspended at the bottom of the backflow prevention mechanism 20 driven by gravity;

[0034] In further detail, the cable well body 10 includes a sump and a self-seepage well, and the sump is installed at the wellhead of the self-seepage well; the anti-backflow mechanism 20 includes a support shaft 23 fixed inside the cable well body 10, and a fixing seat is installed inside the sump, and the support shaft 23 is fixed between the fixing seats by bolts; the external rotation of the support shaft 23 is installed with a first filter plate 21 and a second filter plate 22 that can be elastically expanded according to the water flow rate; the first filter plate 21 and the second filter plate 22 are respectively installed with bearings on the support shaft 23, so that the first filter plate 21 and the second filter plate 22 can rotate around the support shaft 23, thereby facilitating the adjustment of the angle between the first filter plate 21 and the second filter plate 22.

[0035] Among them, at least one spring 28 is fixedly installed between the first filter plate 21 and the second filter plate 22. The elastic force provided by the spring 28 can keep the first filter plate 21 and the second filter plate 22 in the whole device closed to the wellhead of the self-seepage well under normal conditions. When the water flow inside the cable well is low, the angle between the first filter plate 21 and the second filter plate 22 becomes slightly smaller, so as to filter the sediment in the water flow in the cable well. When the surface mesh of the filter plate is blocked or the water flow inside the cable well increases, the impact force of the water flow on the first filter plate 21 and the second filter plate 22 will increase, so that the expansion angle between the first filter plate 21 and the second filter plate 22 becomes smaller, so that the gap between the filter plate and the cable well wall becomes larger, which can speed up the discharge of the water flow accumulated inside the cable well. At the same time, the smaller angle between the two filter plates also changes the contact point between the water flow and the filter plate, so that the water flow will contact the mesh of the filter plate that is not blocked, thereby increasing the drainage rate. This makes it so that the filter plate will not be fixed in a certain place for a long time and the mesh will not be blocked, thereby improving the drainage effect and protecting the cable.

[0036] In further detail, a mud delivery tube 24 is rotatably mounted on both filter plates. The mud delivery tube 24 is a through-tube structure. Both ends of the mud delivery tube 24 are fixedly mounted with raised rings. The surface of the filter plate is provided with raised grooves matching the raised rings, so that the mud delivery tube 24 can be rotatably mounted on the filter plate. A plurality of liquid guide plates 25 are fixedly mounted on the mud delivery tube 24, and the liquid guide plates 25 extend into the diversion channel at the bottom of the filter plate; when the water flow carrying sediment hits the first filter plate 21 and the second filter plate 22, the first filter plate 21 and the second filter plate 22 will filter out the sediment in the water flow, and the filtered water enters the interior of the filter plate and flows out from the diversion channel inside the filter plate. Then, since the liquid guide plate 25 extends into the diversion channel, the water flowing in the diversion channel will impact the liquid guide plate 25, so that the liquid guide plate 25 can rotate.

[0037] In further detail, a mud inlet groove 29 is provided on the mud delivery barrel 24 between two adjacent liquid guide plates 25. The mud inlet groove 29 enables the mud flowing on the filter plate surface to directly enter the interior of the mud delivery barrel 24; wherein, a set of symmetrical spiral blades 27 are fixedly installed on the inner wall of the mud delivery barrel 24, so when the liquid guide plate 25 is impacted by the water flow and rotates, the liquid guide plate 25 will drive the mud delivery barrel 24 to rotate, and when the mud delivery barrel 24 rotates, the mud delivery barrel 24 will drive the internal spiral blades 27 to rotate, and the mud entering the mud delivery barrel 24 will be transferred out after the spiral blades 27 rotate; wherein, the rotation of the spiral blades 27 will cause the material between it and the barrel wall to be pushed forward, and the shape of the spiral blades 27 makes the mud move along the spiral direction of the blades under the push of the blades, thereby ensuring that the mud inside the mud delivery barrel 24 can be discharged in time to avoid blockage.

[0038] like Figure 1-Figure 7As shown, the anti-backflow mechanism 20 also includes a flow limiting plate 26 fixed on the first filter plate 21 and the second filter plate 22 respectively, and the cross-section of the flow limiting plate 26 is a right-angled trapezoid. The flow limiting plate 26 is a through plate structure with a large opening at one end and a small opening at the other end. The large opening end of the flow limiting plate 26 faces the direction in which the sediment enters. Therefore, when the sediment passes through the flow limiting plate 26, the flow limiting plate 26 can convert the thick sediment into thin sediment and slowly transfer it to the sediment inlet trough 29, which can avoid the problem that a large amount of sediment cannot enter the interior of the sediment inlet trough 29, and effectively prevent the sediment from escaping from the filter plate. In addition, the flow limiting plate 26 can also slow down the water flow carrying sediment, so that in the process of slowing down the water flow, the filtration time between the water flow and the filter plate is increased, thereby improving the filtration effect. Figure 1-Figure 8 As shown, the clearing mechanism 30 includes a mud guide tube 31 rotatably connected to the mud delivery tube 24. A raised ring is also fixed to the outer wall of the mud guide tube 31, and a raised groove matching the raised ring is provided on the filter plate, so that the mud guide tube 31 can rotate around the filter plate. A suspension plate 32 is installed at the bottom of the mud guide tube 31;

[0039] The water flow carrying sediment is filtered through two elastically connected filter plates, and the water flow is discharged from the diversion channel at the bottom of the filter plate, and the water flow in the diversion channel is used to impact the liquid guide plate 25 to rotate the mud delivery tube 24, and the sediment is discharged to the bottom of the suspension plate 32. The clearing mechanism 30 also includes a groove 33 opened on the suspension plate 32, and a slide plate 35 slidably connected to the inner wall of the groove 33 is fixedly installed on the mud guide tube 31. The slide plate 35 ensures that the mud guide tube 31 moves around the suspension plate 32 during the sliding process of the inner wall of the groove 33; when the angle between the first filter plate 21 and the second filter plate 22 changes, the mud guide tube 31 and the filter plate are always vertically downward due to gravity, so the sliding of the slide plate 35 inside the groove 33 can overcome the distance change between the mud guide tubes 31 on both sides.

[0040] In further detail, a baffle 37 is fixed on the suspension plate 32 at the groove 33, and a sealing plate 34 is elastically connected to one side of the baffle 37 through a torsion spring. When the mud and sand coming from the mud guide tube 31 is transferred to the inside of the groove 33, the mud and sand will squeeze the sealing plate 34 due to gravity and transfer to the bottom, so that the anti-backflow device can realize self-cleaning of the mud and sand, and improve the drainage effect of the anti-backflow device.

[0041] In addition, a boosting plate 36 is fixed at the bottom of the suspension plate 32. The boosting plate 36 is a hollow float that can provide a boosting effect. When the water level in the cable well rises, the hollow float floats up, driving the suspension plate 32 to float up. When the suspension plate 32 floats up, the suspension plate 32 will drive the first filter plate 21 and the second filter plate 22 to increase the angle, thereby sealing the inside of the cable well, thereby preventing backflow and protecting the cables in the cable well.

[0042] Working principle: First, the anti-backflow mechanism 20 is installed inside the cable well body 10. Due to the elastic force provided by the spring 28, the first filter plate 21 and the second filter plate 22 in the entire anti-backflow device can normally seal the self-seepage well mouth. When the water flow inside the cable well is low, the angle between the first filter plate 21 and the second filter plate 22 becomes slightly smaller, thereby filtering the sediment in the water flow in the cable well. When the surface mesh of the filter plate is blocked or the water flow inside the cable well increases, the impact force of the water flow on the first filter plate 21 and the second filter plate 22 will increase, thereby reducing the expansion angle between the first filter plate 21 and the second filter plate 22, thereby increasing the gap between the filter plate and the cable well wall, and accelerating the discharge of the water flow accumulated inside the cable well. At the same time, the smaller angle between the two filter plates also changes the contact point between the water flow and the filter plate, thereby causing the water flow to contact the filter plate mesh that is not blocked, thereby increasing the drainage rate.

[0043] When the water flow carrying sediment hits the first filter plate 21 and the second filter plate 22, the first filter plate 21 and the second filter plate 22 will filter out the sediment in the water flow, and the filtered water enters the interior of the filter plate and flows out from the guide channel inside the filter plate. Then, since the liquid guide plate 25 extends into the guide channel, the water flowing in the guide channel will impact the liquid guide plate 25, so that the liquid guide plate 25 can rotate; when the liquid guide plate 25 is impacted by the water flow and rotates, the liquid guide plate 25 will drive the mud conveying tube 24 to rotate, and when the mud conveying tube 24 rotates, the mud conveying tube 24 will drive the internal spiral blades 27 to rotate, and the sediment entering the interior of the mud conveying tube 24 will be transferred out after the spiral blades 27 rotate. This ensures that the sediment inside the mud conveying tube 24 can be discharged in time to avoid blockage. When the mud and sand entering the mud guide tube 31 are transferred to the inside of the groove 33, the mud and sand will squeeze the blocking plate 34 due to gravity and be transferred to the bottom, so that the anti-backflow device can realize self-cleaning of the mud and sand, thereby improving the drainage effect of the anti-backflow device.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes to the anti-backflow device for cable wells and the inventive concept according to the technology of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A backflow prevention device for a cable well, comprising a cable well body (10) and a backflow prevention mechanism (20), characterized in that: It also includes: a clearing mechanism (30) suspended at the bottom of the backflow prevention mechanism (20) driven by gravity; The backflow prevention mechanism (20) comprises a support shaft (23) fixed inside the cable well body (10), and a first filter plate (21) and a second filter plate (22) which can be elastically expanded according to the water flow rate are rotatably mounted outside the support shaft (23); A mud delivery cylinder (24) is rotatably mounted on each of the two filter plates, a plurality of liquid guide plates (25) are fixedly mounted on the mud delivery cylinder (24), and the liquid guide plates (25) extend into a flow guide channel at the bottom of the filter plate; The blockage clearing mechanism (30) comprises a mud guide cylinder (31) rotatably connected to the mud conveying cylinder (24), and a suspension plate (32) is mounted on the bottom of the mud guide cylinder (31); The water flow carrying the sediment is filtered through the two elastically connected filter plates, and the water flow is discharged from the diversion channel at the bottom of the filter plate. The water flow in the diversion channel is used to impact the liquid guide plate (25) to rotate the mud conveying tube (24), and the sediment is discharged to the bottom of the suspension plate (32); At least one spring (28) is fixedly mounted between the first filter plate (21) and the second filter plate (22); The backflow prevention mechanism (20) further comprises a flow limiting plate (26) respectively fixed on the first filter plate (21) and the second filter plate (22), wherein the cross section of the flow limiting plate (26) is a right-angled trapezoidal shape; The blockage clearing mechanism (30) further comprises a groove (33) formed on the suspension plate (32), and a slide plate (35) slidably connected to the inner wall of the groove (33) is fixedly mounted on the mud guide tube (31).

2. The anti-backflow device for a cable well according to claim 1, characterized in that: A mud inlet groove (29) is provided on the mud delivery tube (24) located between two adjacent liquid guide plates (25).

3. The anti-backflow device for a cable well according to claim 2, characterized in that: A group of symmetrical spiral blades (27) are fixedly mounted on the inner wall of the mud conveying barrel (24). The mud and sand entering the mud conveying barrel (24) rotates and drives the spiral blades (27) to convey the mud and sand out.

4. The anti-backflow device for a cable well according to claim 1, characterized in that: A baffle plate (37) is fixed on the suspension plate (32) at the groove (33), and a blocking plate (34) is elastically connected to one side of the baffle plate (37).

5. The anti-backflow device for a cable well according to claim 4, characterized in that: A boosting plate (36) is fixed to the bottom of the suspension plate (32).

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