Pipeline leakage rate detection device based on laser measurement

Abstract

The invention discloses a pipeline leakage rate detection device based on laser measurement, and relates to the field of laser measurement. The pipeline leakage amount detection device based on laser measurement comprises a support unit, a water inlet unit and a water head height measurement unit, and the water inlet unit comprises a large amount of water inlet assemblies, a dense water supplementing assembly and a switching assembly. According to the pipeline leakage rate detection device based on laser measurement, multi-point uniform water supplementation is achieved through the densely distributed water supplementation assemblies, liquid level violent fluctuation caused by single-pipe water injection is avoided, the deviation between a test water head and a design water head is reduced, and pressure difference control is more accurate. Real-time monitoring and feedback of the water head height measuring units are combined, closed-loop control is formed, the water head fluctuation amplitude is reduced, the leakage point detection reliability is improved, the multiple water head height measuring units synchronously collect data, errors of a single sensor are eliminated, and the error rate is reduced by combining the water supplementing amount, the test time and the pipeline length and the water seepage amount.

Description

Technical Field

[0001] The present invention relates to the technical field of laser measurement, and in particular to a pipeline leakage detection device based on laser measurement. Background Art

[0002] When detecting the leakage of a pipeline, a pipeline closed water test is generally adopted. During the test, the test pipe section needs to be sealed first. Both ends of the pipeline are sealed with brick plugs. A drain pipe and valve are installed in the downstream to ensure the pressure bearing capacity. The water level is filled to 2 meters above the top of the upstream pipe of the test section and soaked for 1-2 days to fully infiltrate the pipeline.

[0003] During the formal test, water needs to be injected into the pipeline well until the test water head reaches the specified height and then the timing starts. The constant water head is maintained by continuous water replenishment. Finally, the water seepage amount is calculated during the test time based on the water replenishment volume, observation time and pipe section length.

[0004] However, in the actual water replenishment process, the test water head is usually observed manually to maintain a constant design water head, and a large gap is likely to appear between the test water head and the design water head. At the same time, since the diameter of the water injection pipe is usually large, and there is a certain height between the water injection pipe and the liquid level, the liquid level inside the pipeline well will produce large fluctuations during the water injection process, further affecting the height of the test water head. If the water head fluctuates greatly, the pressure difference between the inside and outside of the pipeline will change, which may cause the leakage point to not be detected during the low-pressure period, or misjudge the pipeline pressure resistance during the high-pressure period. Although the measurement accuracy of the laser sensor is high, the water replenishment amount may also have certain errors when the test water head fluctuates greatly, resulting in certain errors in the calculated water seepage amount. Therefore, the present application proposes a pipeline leakage detection device based on laser measurement with a relatively stable test water head. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a pipeline leakage detection device based on laser measurement, which solves the problems of violent liquid level fluctuations caused by a single pipe and large deviation between the test water head and the design water head during the actual water replenishment process.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A pipeline leakage detection device based on laser measurement, comprising:

[0007] A bracket unit, comprising a positioning ring and a plurality of supporting profiles arranged around an outer ring of the positioning ring, wherein the positioning ring is arranged above the pipeline well through the plurality of supporting profiles;

[0008] The water inlet unit includes a large amount of water inlet assembly, a dense water replenishment assembly and a switching assembly. The large amount of water inlet assembly is arranged through the positioning ring and the dense water replenishment assembly. The large amount of water inlet assembly is used for large-scale water inflow into the pipeline well in the preliminary stage of the closed water test. The dense water replenishment assembly is used for dense water replenishment of the pipeline well in the water replenishment stage of the closed water test. The switching assembly is used for switching the operation between the large amount of water inlet assembly and the dense water replenishment assembly;

[0009] A water head height measuring unit can be optionally provided with multiple water head height measuring units, and the multiple water head height measuring units simultaneously measure the water head height inside the pipeline well. The water head height measuring unit includes a measuring rod, a floating airbag and a measuring sleeve. The measuring rod is set through the supporting profile, the floating airbag is fixedly installed at the bottom end of the measuring rod, and the floating airbag floats on the liquid surface inside the pipeline well. The measuring sleeve is fixedly installed above the supporting profile. The measuring rod is movably inserted into the interior of the measuring sleeve, and a laser sensor is installed on the inner wall of the measuring sleeve. The laser sensor includes a laser transmitter and a laser receiver. The laser transmitter is used to emit laser to the surface of the measuring rod, and the laser receiver is used to receive the laser reflected by the surface of the measuring rod. The displacement of the measuring rod is calculated by the time difference or phase difference between the emission and reception of the laser. Multiple water head height measuring units simultaneously measure the water head height inside the pipeline well, and cooperate with the dense water replenishment components for precise water replenishment. After the test, the water seepage of the closed water test is calculated using the water replenishment amount, test time and pipeline length.

[0010] Preferably, a lifting ring for auxiliary lifting is fixedly installed above the supporting profile, and a clamping assembly is provided at the end of the supporting profile, and the clamping assembly includes a fixed block, an inner ring limit block, a threaded rod and a clamping block. The fixed block and the inner ring limit block are respectively fixedly installed at the end and bottom of the supporting profile, and the inner ring limit block fits tightly against the inner wall of the top of the pipeline shaft, the threaded rod is threadedly connected to the inner wall of the fixed block, one end of the threaded rod extends outward and is fixedly connected to a rotating cap, and the other end of the threaded rod is rotatably connected to the clamping block, and the clamping block is slidably arranged below the supporting profile, so that the clamping block can be tightly against the outer wall of the top of the pipeline shaft when the threaded rod is rotated.

[0011] Preferably, the large amount of water inlet assembly includes:

[0012] The water inlet sleeve is movably plugged into the inner wall of the positioning ring. A flange is fixedly connected to the top of the water inlet sleeve, and the flange can be used to connect to the external water inlet pipeline. A plurality of water outlet holes are opened around the outer side of the water inlet sleeve, and the positioning ring seals the plurality of water outlet holes.

[0013] A limit seat is located below the water inlet sleeve and the dense water replenishment component, a sealing block is fixedly provided on the inner ring of the limit seat, and an annular groove is formed between the limit seat and the sealing block;

[0014] A plurality of connecting rods are fixedly arranged between the limit seat and the dense water supply component, and a large number of water inlets are formed between the plurality of connecting rods;

[0015] When the external water inlet pipe injects water into the water inlet sleeve, the water is discharged outward in large quantities through a large number of water inlets, and then quickly enters the interior of the pipeline well until the liquid level inside the pipeline well reaches the water head height. At this time, the water inlet sleeve is driven to move downward until the bottom of the water inlet sleeve is inserted into the annular groove for sealing. At the same time, multiple water outlet holes move downward with the water inlet sleeve and are connected to the dense water replenishment component. When the interior of the pipeline well is replenished with water, multiple water outlet holes are used in conjunction with the dense water replenishment component to densely replenish the pipeline well with water.

[0016] Preferably, the dense water replenishment component includes:

[0017] A water storage tank is fixedly arranged below the positioning ring and the plurality of supporting profiles and sleeved on the outside of the water inlet sleeve. The inner bottom wall of the water storage tank is provided with a plurality of selectable movable grooves along the radial direction. The inner bottom wall of the movable groove is provided with a plurality of densely distributed water inlet holes at equal distances along the radial direction. The water storage tank is connected to the outside world through the densely distributed water inlet holes.

[0018] A moving bar is slidably arranged on the inner wall of the moving groove, and the moving bar is provided with a plurality of communicating holes connected with the densely distributed water inlet holes;

[0019] A reset mechanism, which is provided at the end of the moving bar and is used to reset the moving bar;

[0020] an adjusting mechanism, which is arranged above the supporting profile;

[0021] The moving mechanism is connected to the moving strip, and the adjusting mechanism cooperates with the moving mechanism to drive the multiple moving strips to move on the inner wall of the moving groove.

[0022] Preferably, the reset mechanism includes:

[0023] A reset sleeve is fixedly mounted on the inner bottom wall of the water tank, and a sealing groove is provided on the inner wall of the reset sleeve;

[0024] A piston rod is movably inserted into the inner wall of the sealing groove, and the other end of the piston rod extends outward and is fixedly connected to the end of the moving bar;

[0025] The reset rod is movably plugged into the inner wall of the reset sleeve. One end of the reset rod extends into the sealing groove and is fixedly connected to the piston rod. A reset spring is fixedly connected between the other end of the reset rod and the inner wall of the reset sleeve.

[0026] Preferably, the adjustment mechanism includes:

[0027] A drive motor is fixed to the outside of the supporting profile via a motor bracket;

[0028] A worm is rotatably mounted on the top of the supporting profile via a rotating seat, and a driving end of the driving motor is fixedly connected to an end of the worm;

[0029] An installation support frame is fixedly installed above the supporting profile, and the inner ring of the installation support frame is rotatably connected to a rotating ring;

[0030] A worm wheel is fixedly mounted above the rotating ring and is meshed with the worm;

[0031] The internal thread ring is fixedly installed below the rotating ring.

[0032] The screw rod is threadedly connected to the inside of the internal threaded ring. The top end of the screw rod is movably inserted into the rotating ring and the worm gear. The bottom end of the screw rod is fixedly connected to a sealing rod. The sealing rod extends through the supporting profile toward the inside of the water tank and is connected to the moving mechanism.

[0033] Preferably, the moving mechanism includes:

[0034] A movable ring, both sides of which are fixedly connected to the bottom ends of the two sealing rods;

[0035] A limit bar, which is fixedly installed above the reset mechanism and has a through limit hole;

[0036] The top end of the limiting rod is movably inserted into the limiting hole, and the bottom end of the limiting rod is fixedly connected to the end of the moving bar. The middle part of the limiting rod is tilted downward toward the end of the moving bar, and the bottom of the moving ring is in contact with the middle parts of multiple limiting rods.

[0037] Preferably, the switching component includes:

[0038] A switching motor is fixedly installed above the supporting profile;

[0039] A limiting bracket, which is fixedly installed above the supporting profile;

[0040] A screw rod, the top end of which is rotatably connected to the top of the limiting bracket;

[0041] A fixing member, wherein the fixing member is fixedly sleeved on the outer ring surface of the water inlet sleeve, and the end portion of the fixing member is slidably arranged on the side wall of the limiting bracket;

[0042] The transmission member is arranged inside the supporting profile, the bottom ends of the switching motor drive shaft and the screw rod both extend toward the inside of the supporting profile, and the transmission member is arranged between the switching motor drive shaft and the screw rod.

[0043] Preferably, the water head height measuring unit further includes:

[0044] a pointer, which is provided at the top end of the measuring rod;

[0045] The scale is arranged above the supporting profile, and the end of the pointer points to the scale line of the scale. The pointer cooperates with the scale to facilitate on-site personnel to check.

[0046] Preferably, a sealing sleeve is fixedly connected to the inner wall of the water tank, and the measuring rod is movably inserted into the inner wall of the sealing sleeve, and a scale bracket for fixing the scale is fixedly installed above the supporting profile, and a threaded column is provided at the top of the measuring rod, and a nut is threadedly connected to the threaded column, and a movable ring is fixedly and rotatably connected below the nut, and the movable ring is movably sleeved on the outside of the threaded column, and the top of the pointer is fixedly connected to the outside of the movable ring.

[0047] The present invention discloses a pipeline leakage detection device based on laser measurement, which has the following beneficial effects:

[0048] 1. This laser-measurement-based pipeline leakage detection device achieves uniform water replenishment at multiple points through densely distributed water replenishment components, avoiding drastic liquid level fluctuations caused by single-pipe water injection. The deviation between the test water head and the design water head is reduced, and the pressure difference control is more precise. Combined with the real-time monitoring and feedback of the water head height measurement unit, a closed-loop control is formed, the amplitude of water head fluctuation is reduced, and the reliability of leakage point detection is improved. Multiple water head height measurement units collect data synchronously, eliminating the error of a single sensor. Combined with the water replenishment volume, test time, and pipeline length, the error rate of water seepage calculation is reduced, a large number of water inlet components are quickly filled with water, the initial water filling time is shortened, and the overall test cycle is reduced. The switching component automatically switches the water injection mode without manual intervention, improving the convenience of operation.

[0049] 2. In this laser-based pipeline leakage detection device, displacement sensors in multiple water head height measurement units collect real-time liquid level data and transmit it to a controller. The controller averages these data sets and calculates the instantaneous fluctuation value. When the instantaneous fluctuation value exceeds a threshold, it indicates that the current water head height fluctuation exceeds the allowable range. At this point, the moving bar in the dense water replenishment assembly needs to be controlled to move. This movement of the moving bar changes the effective aperture of the dense water inlet holes. Specifically, the synergistic effect of the adjustment mechanism and the movement mechanism enables precise control of the moving bar's position.

[0050] 3. This laser-based pipeline leakage detection device uses a moving bar to adjust the effective diameter of the densely distributed water inlet holes by varying the overlapping area between the connecting holes and the densely distributed water inlet holes. Reducing the diameter of the densely distributed water inlet holes reduces the amount of water entering per unit time, making the water replenishment process smoother. This helps reduce fluctuations in water head height and keeps the test water head more stably near the design water head. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 This is a schematic diagram of the structure of the present invention in an installed state;

[0053] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0054] Figure 3 It is a cross-sectional view of the overall structure of the present invention;

[0055] Figure 4 This is a partial three-dimensional structural cross-sectional view of the water inlet unit of the present invention;

[0056] Figure 5 This is a partial planar structural sectional view of the water inlet unit of the present invention;

[0057] Figure 6 This is a cross-sectional view of the overall structure of the water inlet unit and the supporting profile of the present invention;

[0058] Figure 7 It is a structural cross-sectional view of the water storage tank of the present invention;

[0059] Figure 8 This is a schematic structural diagram of the dense water replenishment component of the present invention;

[0060] Figure 9 It is a cross-sectional view of the structure of the reset mechanism and the moving mechanism of the present invention;

[0061] Figure 10 It is a structural cross-sectional view of the adjustment mechanism of the present invention;

[0062] Figure 11 It is a structural schematic diagram of the water head height measuring unit of the present invention.

[0063] In the picture:

[0064] 1. Bracket unit;

[0065] 11. A positioning ring;

[0066] 12. A support profile;

[0067] 13. A clamping assembly; 131, a fixed block; 132, an inner ring limiting block; 133, a threaded rod; 134, a clamping block;

[0068] 2. A water inlet unit;

[0069] 21. A large water inlet assembly; 211, a water inlet sleeve; 212, a water outlet hole; 213, a limiting seat; 214, a sealing block; 215, an annular groove; 216, a connecting rod; 217, a large water inlet;

[0070] 22. A densely water replenishment assembly; 221, a water storage tank; 222, a moving groove; 2221, a densely water inlet hole; 223, a moving strip; 2231, a communication hole; 224, a reset mechanism; 2241, a reset sleeve; 2242, a piston rod; 2243, a sealing groove; 2244, a reset rod; 2245, a reset spring; 225, an adjusting mechanism; 2251, a driving motor; 2252, a worm; 2253, a mounting support frame; 2254, a worm wheel; 2255, an internal thread ring; 2256, a lead screw; 2257, a sealing rod; 226, a moving mechanism; 2261, a moving ring; 2262, a limiting strip; 2263, a limiting rod;

[0071] 23. A switching assembly; 231, a switching motor; 232, a limiting support; 233, a screw rod; 234, a fixing piece; 235, a transmission piece;

[0072] 3. A water head height measuring unit; 31, a measuring rod; 32, a floating air bag; 33, a measuring sleeve; 34, a pointer; 35, a scale table; 36, a sealing sleeve; 37, a scale table support; 38, a nut; 39, a movable ring. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0074] The embodiments of the present application provide a pipeline leakage amount detection device based on laser measurement, and solve the problems of large deviation between the test water head and the design water head caused by the liquid surface violent fluctuation of a single pipe in the actual water replenishment process.

[0075] By densely distributing water replenishment components 22, uniform water replenishment at multiple points is achieved, avoiding the violent fluctuations in the liquid level caused by single-pipe water injection. The deviation between the test water head and the designed water head is reduced, and the pressure difference control is more precise. Combined with the real-time monitoring and feedback of the water head height measurement unit 3, a closed-loop control is formed, the amplitude of water head fluctuation is reduced, and the reliability of leakage point detection is improved. Multiple water head height measurement units 3 collect data synchronously, eliminating the error of a single sensor. Combined with the water replenishment volume, test time and pipeline length, the error rate of water seepage calculation is reduced. A large number of water inlet components 21 are quickly injected, the initial water filling time is shortened, and the overall test cycle is reduced. The switching component 23 automatically switches the water injection mode without manual intervention, improving the convenience of operation.

[0076] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0077] An embodiment of the present invention discloses a pipeline leakage detection device based on laser measurement.

[0078] According to the attached Figure 1-11 Shown, including:

[0079] The bracket unit 1 includes a positioning ring 11 and a plurality of supporting profiles 12 arranged around the outer ring of the positioning ring 11. The positioning ring 11 is arranged above the pipeline shaft through the plurality of supporting profiles 12;

[0080] The water inlet unit 2 includes a large amount of water inlet assembly 21, a dense water replenishment assembly 22 and a switching assembly 23. The large amount of water inlet assembly 21 is arranged through the positioning ring 11 and the dense water replenishment assembly 22. The large amount of water inlet assembly 21 is used for large-scale water inflow into the pipeline well in the preliminary stage of the closed water test. The dense water replenishment assembly 22 is used for dense water replenishment of the pipeline well in the water replenishment stage of the closed water test. The switching assembly 23 is used for switching the operation between the large amount of water inlet assembly 21 and the dense water replenishment assembly 22;

[0081] The water head height measuring unit 3 can be optionally provided with multiple water head height measuring units 3. The multiple water head height measuring units 3 measure the water head height inside the pipeline well at the same time. The water head height measuring unit 3 includes a measuring rod 31, a floating airbag 32 and a measuring sleeve 33. The measuring rod 31 is set through the supporting profile 12. The floating airbag 32 is fixedly installed at the bottom end of the measuring rod 31, and the floating airbag 32 floats on the liquid surface inside the pipeline well. The measuring sleeve 33 is fixedly installed above the supporting profile 12. The measuring rod 31 is movably plugged into the inside of the measuring sleeve 33, and the measuring sleeve 33 is fixedly installed above the supporting profile 12. A laser sensor is installed on the inner wall of 3. The laser sensor includes a laser transmitter and a laser receiver. The laser transmitter is used to transmit laser light to the surface of the measuring rod 31, and the laser receiver is used to receive the laser light reflected by the surface of the measuring rod 31. The displacement of the measuring rod 31 is calculated by the time difference or phase difference between the emission and reception of the laser. Multiple water head height measuring units 3 simultaneously measure the water head height inside the pipeline well and cooperate with the dense water replenishment component 22 to accurately replenish water. After the test, the water seepage of the closed water test is calculated using the water replenishment amount, test time and pipeline length.

[0082] By densely distributing water replenishment components 22, uniform water replenishment at multiple points is achieved, avoiding the violent fluctuations in the liquid level caused by single-pipe water injection. The deviation between the test water head and the designed water head is reduced, and the pressure difference control is more precise. Combined with the real-time monitoring and feedback of the water head height measurement unit 3, a closed-loop control is formed, the amplitude of water head fluctuation is reduced, and the reliability of leakage point detection is improved. Multiple water head height measurement units 3 collect data synchronously, eliminating the error of a single sensor. Combined with the water replenishment volume, test time and pipeline length, the error rate of water seepage calculation is reduced. A large number of water inlet components 21 are quickly injected, the initial water filling time is shortened, and the overall test cycle is reduced. The switching component 23 automatically switches the water injection mode without manual intervention, improving the convenience of operation.

[0083] It is particularly disclosed that a lifting ring for auxiliary lifting is fixedly installed above the supporting profile 12, and a clamping assembly 13 is provided at the end of the supporting profile 12. The clamping assembly 13 includes a fixed block 131, an inner ring limit block 132, a threaded rod 133 and a clamping block 134. The fixed block 131 and the inner ring limit block 132 are respectively fixedly installed at the end and bottom of the supporting profile 12, and the inner ring limit block 132 fits tightly against the inner wall of the top of the pipeline shaft. The threaded rod 133 is threadedly connected to the inner wall of the fixed block 131. One end of the threaded rod 133 extends outward and is fixedly connected to a rotating cap, and the other end of the threaded rod 133 is rotatably connected to the clamping block 134. The clamping block 134 is slidably arranged below the supporting profile 12, and when the threaded rod 133 is rotated, the clamping block 134 can be tightly against the outer wall of the top of the pipeline shaft.

[0084] The positioning ring 11 is suspended on the pipe wellhead through the supporting profile 12. The clamping assembly 13 at the end of the supporting profile 12 is fixed in two directions by internal support and external pressure. The inner ring limit block 132 fits the inner wall of the well wall. The rotating threaded rod 133 pushes the clamping block 134 to press against the outer edge of the well wall to form an impact-resistant fixing mode, ensuring that the device is horizontal and stable, and is hoisted into place as a whole through the lifting ring auxiliary device.

[0085] Specifically disclosed, a large amount of water inlet assembly 21 includes:

[0086] The water inlet sleeve 211 is movably plugged into the inner wall of the positioning ring 11. A flange is fixedly mounted on the top of the water inlet sleeve 211, which can be connected to the external water inlet pipeline. A plurality of water outlet holes 212 are opened around the outer side of the water inlet sleeve 211, and the positioning ring 11 seals the plurality of water outlet holes 212.

[0087] The limiting seat 213 is located below the water inlet sleeve 211 and the dense water replenishment assembly 22. A sealing block 214 is fixedly provided on the inner ring of the limiting seat 213, and an annular groove 215 is formed between the limiting seat 213 and the sealing block 214;

[0088] A plurality of connecting rods 216 are fixedly disposed between the limiting seat 213 and the dense water replenishing assembly 22, and a large number of water inlets 217 are formed between the plurality of connecting rods 216;

[0089] When the external water inlet pipe injects water into the water inlet sleeve 211, the water is discharged outward in large quantities through a large number of water inlets 217, and then quickly enters the interior of the pipeline well until the liquid level inside the pipeline well reaches the water head height. At this time, the water inlet sleeve 211 is driven to move downward until the bottom of the water inlet sleeve 211 is inserted into the annular groove 215 for sealing. At the same time, multiple water outlet holes 212 move downward with the water inlet sleeve 211 and are connected to the dense water replenishment component 22. When the interior of the pipeline well is replenished with water, multiple water outlet holes 212 are used in conjunction with the dense water replenishment component 22 to densely replenish the pipeline well with water.

[0090] Specifically disclosed, the dense water replenishment component 22 includes:

[0091] The water tank 221 is fixedly disposed below the positioning ring 11 and the plurality of support profiles 12 and sleeved on the outside of the water inlet sleeve 211. The inner bottom wall of the water tank 221 is provided with a plurality of selectable movable grooves 222 along the radial direction. The inner bottom wall of the movable groove 222 is provided with a plurality of densely distributed water inlet holes 2221 at equal distances along the radial direction. The water tank 221 is connected to the outside world through the densely distributed water inlet holes 2221.

[0092] The moving bar 223 is slidably disposed on the inner wall of the moving groove 222 and has a plurality of communication holes 2231 connected to the densely distributed water inlet holes 2221;

[0093] a reset mechanism 224 disposed at the end of the moving bar 223 for resetting the moving bar 223;

[0094] an adjustment mechanism 225 , which is disposed above the support profile 12 ;

[0095] The moving mechanism 226 is connected to the moving bars 223 , and the adjustment mechanism 225 cooperates with the moving mechanism 226 to drive the multiple moving bars 223 to move on the inner wall of the moving groove 222 .

[0096] Specifically disclosed, the reset mechanism 224 includes:

[0097] The reset sleeve 2241 is fixedly mounted on the inner bottom wall of the water storage tank 221. A sealing groove 2243 is formed on the inner wall of the reset sleeve 2241.

[0098] The piston rod 2242 is movably inserted into the inner wall of the sealing groove 2243, and the other end of the piston rod 2242 extends outward and is fixedly connected to the end of the moving bar 223;

[0099] The reset rod 2244 is movably inserted into the inner wall of the reset sleeve 2241. One end of the reset rod 2244 extends into the sealing groove 2243 and is fixedly connected to the piston rod 2242. A reset spring 2245 is fixedly connected between the other end of the reset rod 2244 and the inner wall of the reset sleeve 2241.

[0100] Specifically disclosed, the adjustment mechanism 225 includes:

[0101] The drive motor 2251 is fixed to the outside of the support profile 12 via a motor bracket;

[0102] The worm 2252 is rotatably mounted on the top of the support profile 12 via a rotating seat, and the driving end of the drive motor 2251 is fixedly connected to the end of the worm 2252;

[0103] The mounting support frame 2253 is fixedly mounted above the supporting profile 12, and the inner ring of the mounting support frame 2253 is rotatably connected to a rotating ring;

[0104] The worm gear 2254 is fixedly mounted above the rotating ring and is meshed with the worm 2252;

[0105] The internal thread ring 2255 is fixedly installed below the rotating ring.

[0106] A screw rod 2256 is screwed in the inner thread ring 2255, the top end of the screw rod 2256 is movably inserted into the rotating ring and the worm gear 2254, and the bottom end of the screw rod 2256 is fixedly connected with a sealing rod 2257, the sealing rod 2257 extends to the inside of the water storage tank 221 through the support profile 12 and is connected with a moving mechanism 226.

[0107] In particular, the moving mechanism 226 comprises:

[0108] A moving ring 2261 is fixedly connected with the bottom end of the two sealing rods 2257;

[0109] A limiting strip 2262 is fixedly installed above the reset mechanism 224, and the limiting strip 2262 is provided with a limiting hole;

[0110] A limiting rod 2263 is movably inserted into the limiting hole, and the bottom end of the limiting rod 2263 is fixedly connected with the end of the moving strip 223, the middle part of the limiting rod 2263 is obliquely downwardly arranged towards the end of the moving strip 223, and the bottom of the moving ring 2261 is in abutment with the middle part of the plurality of limiting rods 2263.

[0111] In the water replenishing stage, the driving motor 2251 of the adjusting mechanism 225 drives the worm gear 2254 to rotate through the worm 2252, drives the screw rod 2256 to ascend and descend, and controls the sealing rod 2257 to drive the moving ring 2261 to press downward.

[0112] The moving ring 2261 pushes the moving strip 223 to translate through the limiting rod 2263, adjusts the overlapping area of the water inlet hole 2221 and the communication hole 2231, and realizes fine water replenishing.

[0113] The reset spring 2245 of the reset mechanism 224 pushes the moving strip 223 to reset after the water replenishing is completed, and restores the water inlet hole diameter.

[0114] In particular, the switching assembly 23 comprises:

[0115] A switching motor 231 is fixedly installed above the support profile 12;

[0116] A limiting support 232 is fixedly installed above the support profile 12;

[0117] A screw rod 233 is rotatably connected with the top of the limiting support 232;

[0118] A fixed part 234 is fixedly sleeved on the outer ring surface of the water inlet sleeve 211, and the end of the fixed part 234 is slidingly arranged on the side wall of the limiting support 232;

[0119] The transmission member 235 is arranged inside the supporting profile 12. The bottom end of the driving shaft of the switching motor 231 and the bottom end of the screw 233 both extend toward the inside of the supporting profile 12, and the transmission member 235 is arranged between the driving shaft of the switching motor 231 and the bottom end of the screw 233.

[0120] The switching motor 231 drives the water inlet sleeve 211 to rise and fall through the screw 233 and the fixing member 234, thereby realizing the on-off switching between the water outlet hole 212 and the densely distributed water inlet holes 2221, avoiding manual intervention.

[0121] Specifically disclosed, the water head height measuring unit 3 further includes:

[0122] a pointer 34 , which is provided at the top end of the measuring rod 31 ;

[0123] The scale 35 is arranged above the supporting profile 12. The end of the pointer 34 points to the scale line of the scale 35. The pointer 34 cooperates with the scale 35 to facilitate on-site personnel to check.

[0124] The floating airbag 32 floats with the liquid surface, driving the measuring rod 31 to rise and fall in the measuring sleeve 33. The displacement sensor records the displacement data, and the pointer 34 points to the scale 35 to display the real-time water head height.

[0125] Multiple groups of measurement unit 3 data are collected synchronously to calculate the instantaneous fluctuation value. The formula is:

[0126] ΔH=|H t -H avy |

[0127] H t Represents the instantaneous water head height data collected at a specific time t.

[0128] H avy It represents the average water head height obtained by averaging the data collected by multiple water head height measurement units 3 within a time window. This average value is used to reflect the overall stability of the water head height.

[0129] ΔH represents the absolute value of the difference between the instantaneous water head height and the average water head height, and is used to quantify the degree of fluctuation of the water head height.

[0130] When the multiple water head height measurement units 3 collect data synchronously, when ΔH exceeds the threshold, it indicates that the current water head height fluctuation exceeds the allowable range. At this time, it is necessary to control the movement bar 223 in the dense water replenishment component 22 to move.

[0131] The movement of the movable bar 223 changes the effective aperture of the densely distributed water inlet holes 2221. Specifically, the coordinated action of the adjustment mechanism 225 and the movement mechanism 226 allows for precise control of the position of the movable bar 223. As the movable bar 223 moves, the overlapping area between the connecting holes 2231 and the densely distributed water inlet holes 2221 changes, thereby adjusting the effective aperture of the densely distributed water inlet holes 2221.

[0132] Narrowing the diameter of the densely distributed water inlet holes 2221 can reduce the amount of water entering per unit time, making the water replenishment process smoother, which helps to reduce the fluctuation of the water head height and keep the test water head more stably near the design water head.

[0133] The controller continuously monitors ΔH. When ΔH falls back to a safe range, the drive motor 2251 reverses, and the moving bar 223 retreats under the action of the reset mechanism 224, gradually restoring the opening of the densely distributed water inlet holes 2221.

[0134] Furthermore, a sealing sleeve 36 is fixedly connected to the inner wall of the water tank 221, and the measuring rod 31 is movably inserted into the inner wall of the sealing sleeve 36. A scale bracket 37 for fixing the scale 35 is fixedly installed above the supporting profile 12. A threaded column is provided at the top of the measuring rod 31, and a nut 38 is threadedly connected to the threaded column. A movable ring 39 is fixedly and rotatably connected below the nut 38. The movable ring 39 is movably sleeved on the outside of the threaded column, and the top of the pointer 34 is fixedly connected to the outside of the movable ring 39.

[0135] The nut 38 and the movable ring 39 can be used to limit the installation of the measuring rod 31 to prevent the measuring rod 31 from falling off. At the same time, after the nut 38 is removed, the measuring rod 31 can also be removed and replaced.

[0136] Overall process:

[0137] S1. Installation and fixing of the device:

[0138] Lift the locating ring 11 of the bracket unit 1 to the pipe wellhead and secure it with the clamping assembly 13 at the end of the supporting profile 12:

[0139] The inner ring limit block 132 is in contact with the inner wall of the well, and the rotating threaded rod 133 pushes the clamping block 134 to press against the outer edge of the well wall, forming a two-way clamping force to ensure that the device is horizontal and stable.

[0140] S2, initial water injection stage:

[0141] Connect the external water source to the top flange of the water inlet sleeve 211 of the large water inlet assembly 21 and start water injection:

[0142] Water is rapidly injected into the well through the bottom opening of the water inlet sleeve 211 and a large number of water inlets 217 between the connecting rods 216 until the liquid level approaches the test water head height.

[0143] When the liquid level is about 50 cm away from the design water head, the switching component 23 is started:

[0144] The switching motor 231 drives the screw 233 to rotate, and drives the water inlet sleeve 211 to descend through the fixing piece 234, so that its bottom is inserted into the annular groove 215 of the limit seat 213, and the water outlet hole 212 is connected with the dense water inlet holes 2221, switching to the water replenishment mode.

[0145] S3, water replenishment and pressure stabilization stage:

[0146] The dense water replenishment assembly 22 is activated: the drive motor 2251 of the adjustment mechanism 225 rotates the worm gear 2254 via the worm 2252, driving the screw 2256 up and down, controlling the sealing rod 2257 to push the movable ring 2261 downward. The movable ring 2261 pushes the movable bar 223 to translate within the movable groove 222 via the limit rod 2263, adjusting the opening of the dense water inlet hole 2221 and achieving refined water replenishment.

[0147] The water head height measurement unit 3 monitors the water head height in real time: a floating airbag 32 floats with the liquid level, driving the measuring rod 31 up and down within the measuring sleeve 33. A displacement sensor records the displacement data, while a pointer 34 points to a scale 35, displaying the real-time water head height. When the liquid level fluctuates beyond a threshold, the position of the moving bar 223 is adjusted to maintain a stable water head.

[0148] S4. Calculation of water seepage: After the test, record the water replenishment volume through the water inlet sleeve 211 flow meter, and calculate the water seepage volume by substituting the test time and pipeline length into the formula:

[0149]

[0150] Multiple sets of water head height measurement unit 3 data are cross-validated to ensure the accuracy of the results.

[0151] S5. Disassembly of the device: After the test is completed, the threaded rod 133 is rotated in the opposite direction to loosen the clamping block 134, and the device is lifted by the lifting ring to complete the test.

[0152] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipeline leakage detection device based on laser measurement, characterized in that: include: A bracket unit (1) comprises a positioning ring (11) and a plurality of supporting profiles (12) arranged around the outer ring of the positioning ring (11), wherein the positioning ring (11) is arranged above the pipeline well via the plurality of supporting profiles (12); The water inlet unit (2) comprises a large amount of water inlet assembly (21), a dense water replenishment assembly (22) and a switching assembly (23). The large amount of water inlet assembly (21) is arranged to penetrate the positioning ring (11) and the dense water replenishment assembly (22). The large amount of water inlet assembly (21) is used for large amount of water inlet to the pipeline well in the initial stage of the closed water test. The dense water replenishment assembly (22) is used for dense water replenishment to the pipeline well in the water replenishment stage of the closed water test. The switching assembly (23) is used for switching the operation between the large amount of water inlet assembly (21) and the dense water replenishment assembly (22). A water head height measuring unit (3) can be optionally provided with a plurality of water head height measuring units (3) for simultaneously measuring the water head height inside a pipeline well. The water head height measuring unit (3) comprises a measuring rod (31), a floating airbag (32) and a measuring sleeve (33). The measuring rod (31) is provided through a supporting profile (12). The floating airbag (32) is fixedly installed at the bottom end of the measuring rod (31) and the floating airbag (32) floats on the liquid surface inside the pipeline well. The measuring sleeve (33) is fixedly installed above the supporting profile (12). The measuring rod (31) is movably plugged into the interior of the measuring sleeve (33). A laser sensor is installed on the inner wall of the measuring sleeve (33) and the displacement of the measuring rod (31) is calculated using the laser sensor.

2. The pipeline leakage detection device based on laser measurement according to claim 1, characterized in that: A lifting ring for auxiliary lifting is fixedly installed above the supporting profile (12), and a clamping assembly (13) is provided at the end of the supporting profile (12), the clamping assembly (13) comprising a fixed block (131), an inner ring limit block (132), a threaded rod (133) and a clamping block (134), the fixed block (131) and the inner ring limit block (132) being fixedly installed at the end and the bottom of the supporting profile (12) respectively, and the inner ring limit block (132) The inner wall of the top of the pipe well fits tightly, the threaded rod (133) is threadedly connected to the inner wall of the fixed block (131), one end of the threaded rod (133) extends outward and is fixedly connected to a rotating cap, and the other end of the threaded rod (133) is rotatably connected to a clamping block (134), and the clamping block (134) is slidably arranged below the supporting profile (12), so that when the threaded rod (133) is rotated, the clamping block (134) can be tightly abutted against the outer wall of the top of the pipe well.

3. The pipeline leakage detection device based on laser measurement according to claim 1, characterized in that: The large amount of water inlet assembly (21) comprises: A water inlet sleeve (211) is movably plugged into the inner wall of the positioning ring (11); a flange is fixedly connected to the top of the water inlet sleeve (211), and the flange can be used to connect to an external water inlet pipeline; a plurality of water outlet holes (212) are provided around the outer side of the water inlet sleeve (211), and the positioning ring (11) seals the plurality of water outlet holes (212); A limiting seat (213) is located below the water inlet sleeve (211) and the dense water replenishment assembly (22); a sealing block (214) is fixedly provided on the inner ring of the limiting seat (213), and an annular groove (215) is formed between the limiting seat (213) and the sealing block (214); A plurality of connecting rods (216) are fixedly arranged between the limiting seat (213) and the dense water replenishing assembly (22), and a large number of water inlets (217) are formed between the plurality of connecting rods (216).

4. The laser measurement-based pipeline leakage detection device according to claim 3, characterized in that: The dense water replenishment component (22) comprises: A water storage tank (221) is fixedly arranged below the positioning ring (11) and the plurality of supporting profiles (12), and is sleeved on the outside of the water inlet sleeve (211). A plurality of selectable movable grooves (222) are provided on the inner bottom wall of the water storage tank (221) along the radial direction. A plurality of densely distributed water inlet holes (2221) are provided on the inner bottom wall of the movable groove (222) at equal distances along the radial direction. The water storage tank (221) is connected to the outside world through the densely distributed water inlet holes (2221); A moving bar (223) is slidably arranged on the inner wall of the moving groove (222), and the moving bar (223) is provided with a plurality of communication holes (2231) connected to the densely distributed water inlet holes (2221); A reset mechanism (224) is provided at the end of the moving bar (223) and is used for resetting the moving bar (223); an adjustment mechanism (225) disposed above the supporting profile (12); The moving mechanism (226) is connected to the moving bars (223), and the adjusting mechanism (225) cooperates with the moving mechanism (226) to drive the plurality of moving bars (223) to move on the inner wall of the moving groove (222).

5. The pipeline leakage detection device based on laser measurement according to claim 4, characterized in that: The reset mechanism (224) comprises: A reset sleeve (2241) is fixedly mounted on the inner bottom wall of the water storage tank (221), and a sealing groove (2243) is provided on the inner wall of the reset sleeve (2241); A piston rod (2242) is movably inserted into the inner wall of the sealing groove (2243), and the other end of the piston rod (2242) extends outward and is fixedly connected to the end of the moving bar (223); A reset rod (2244) is movably inserted into the inner wall of the reset sleeve (2241), one end of the reset rod (2244) extends into the sealing groove (2243) and is fixedly connected to the piston rod (2242), and a reset spring (2245) is fixedly connected between the other end of the reset rod (2244) and the inner wall of the reset sleeve (2241).

6. The pipeline leakage detection device based on laser measurement according to claim 4, characterized in that: The regulating mechanism (225) comprises: A drive motor (2251) is fixed to the outside of the support profile (12) via a motor bracket; A worm (2252) is rotatably mounted on the top of the supporting profile (12) via a rotating seat, and a driving end of the driving motor (2251) is fixedly connected to an end of the worm (2252); An installation support frame (2253) is fixedly installed above the support profile (12), and the inner ring of the installation support frame (2253) is rotatably connected to a rotating ring; A worm wheel (2254) is fixedly mounted above the rotating ring, and the worm wheel (2254) is meshedly connected with the worm (2252); The internal thread ring (2255) is fixedly installed below the rotating ring. The screw rod (2256) is threadedly connected to the interior of the internal thread ring (2255), the top end of the screw rod (2256) is movably inserted into the rotating ring and the worm gear (2254), and the bottom end of the screw rod (2256) is fixedly connected to a sealing rod (2257), and the sealing rod (2257) passes through the supporting profile (12) and extends toward the interior of the water tank (221), and is connected to the moving mechanism (226).

7. The pipeline leakage detection device based on laser measurement according to claim 6, characterized in that: The moving mechanism (226) comprises: A movable ring (2261), both sides of which are fixedly connected to the bottom ends of the two sealing rods (2257); A limiting strip (2262) is fixedly mounted above the reset mechanism (224), and the limiting strip (2262) is provided with a through limiting hole; The top end of the limiting rod (2263) is movably inserted into the limiting hole, and the bottom end of the limiting rod (2263) is fixedly connected to the end of the moving bar (223). The middle part of the limiting rod (2263) is tilted downward toward the end of the moving bar (223), and the bottom of the moving ring (2261) is in contact with the middle parts of multiple limiting rods (2263).

8. The pipeline leakage detection device based on laser measurement according to claim 3, characterized in that: The switching component (23) comprises: A switching motor (231) is fixedly mounted above the supporting profile (12); A limiting bracket (232) is fixedly installed above the supporting profile (12); The top end of the screw rod (233) is rotatably connected to the top end of the limiting bracket (232); A fixing member (234) is fixedly sleeved on the outer ring surface of the water inlet sleeve (211), and an end portion of the fixing member (234) is slidably arranged on the side wall of the limiting bracket (232); A transmission member (235) is arranged inside the supporting profile (12), the bottom end of the switching motor (231) drive shaft and the bottom end of the screw (233) both extend toward the inside of the supporting profile (12), and the transmission member (235) is arranged between the switching motor (231) drive shaft and the bottom end of the screw (233).

9. The pipeline leakage detection device based on laser measurement according to claim 4, characterized in that: The water head height measuring unit (3) further comprises: a pointer (34) disposed on the top end of the measuring rod (31); A scale (35) is arranged above the supporting profile (12), and the end of the pointer (34) points to the scale line of the scale (35).

10. The pipeline leakage detection device based on laser measurement according to claim 9, characterized in that: A sealing sleeve (36) is fixedly connected to the inner wall of the water storage tank (221), and the measuring rod (31) is movably inserted into the inner wall of the sealing sleeve (36). A scale bracket (37) for fixing the scale (35) is fixedly installed above the supporting profile (12). A threaded column is provided at the top end of the measuring rod (31), and a nut (38) is threadedly connected to the threaded column. A movable ring (39) is fixedly rotatably connected to the bottom end of the nut (38). The movable ring (39) is movably sleeved on the outside of the threaded column, and the top end of the pointer (34) is fixedly connected to the outside of the movable ring (39).

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