Self-adaptive pipeline desilting and descaling device driven by pressure jet grouting

Abstract

The invention discloses a self-adaptive pipeline dredging and descaling device driven by pressure jet grouting, and relates to pipeline cleaning, in particular to the self-adaptive pipeline dredging and descaling device driven by pressure jet grouting, which is good in dredging effect and high in efficiency. The self-adaptive pipeline desilting and descaling device driven by pressure jet grouting is characterized in that the desilting and descaling device comprises a power assembly, a descaling assembly, pressurizing equipment and a water storage facility, the power assembly is connected with the pressurizing equipment through a water supply pipe, the descaling assembly is installed on the power assembly, and the pressurizing equipment is connected with the water storage facility through a water suction pipe; according to the self-adaptive pipeline dredging and descaling device driven by pressure rotary jet grouting, the mode of combining mechanical dredging and hydraulic dredging is adopted, and the characteristics of being good in mechanical dredging effect and high in hydraulic dredging efficiency are integrated; compared with high-pressure water jet dredging, water consumption is small, and water is saved; compared with traditional mechanical dredging equipment, the structure is simple and operation is convenient; various working conditions such as concave-convex change of the inner wall of the pipeline can be adapted

Description

Technical Field

[0001] This invention relates to pipe cleaning, and more particularly to an adaptive pipe cleaning and descaling device driven by pressure jet spraying that has good unblocking effect and high efficiency. Background Technology

[0002] In modern industrial and urban infrastructure, pipelines, as key carriers for transporting liquid and gas-solid mixtures, face the severe challenge of endogenous siltation during long-term operation. Organic sludge (such as petroleum colloids and humic acids), inorganic particles (silt and metal oxides), and microbial flora (sulfate-reducing bacteria and iron bacteria) contained in the medium continuously deposit in areas with slow flow and on rough pipe walls, forming complex siltation.

[0003] Over time, impurities such as organic matter, silt, and bacteria contained in the transported medium accumulate and deposit, eventually leading to scale buildup on the inner walls of the pipes. Scale buildup reduces the pipe's flow cross-section and increases surface roughness, thereby reducing its water transport capacity. Simultaneously, the accumulation of silt and scale on the inner walls of the pipes results in decreased water transport capacity, reduced reliability, and increased energy consumption.

[0004] Currently, common methods for dredging and descaling during pipeline system maintenance mainly include manual cleaning, hydraulic dredging, and mechanical dredging. Manual cleaning is only suitable for unblocking large-diameter pipes. It is effective, but it is labor-intensive and poses significant safety hazards during the cleaning process. Hydraulic dredging mainly includes two types: hydraulic cleaning and water jet cleaning. Among them, the high-pressure water jet cleaning method is highly efficient and produces good cleaning quality, but it consumes a lot of water, resulting in high cleaning costs. Compared to hydraulic dredging, mechanical dredging has advantages such as better cleaning effect, higher work efficiency, and simpler implementation process. However, mechanical dredging equipment is complex, expensive, and cannot fully adapt to special working conditions such as unevenness of the inner wall of the pipe. Summary of the Invention

[0005] The present invention aims to solve the problem of scale buildup on the inner wall of existing pipelines during fluid transportation, which affects the use of the pipeline and makes cleaning inconvenient. It provides an adaptive pipeline dredging and descaling device driven by pressure jet, which has good dredging effect and high efficiency.

[0006] The adaptive pipeline dredging and descaling device driven by pressure rotary jetting of the present invention is characterized in that the dredging and descaling device includes a power component, a descaling component, a pressurizing device, and a water storage facility; the power component is connected to the pressurizing device through a water supply pipe; the descaling component is installed on the power component; and the pressurizing device is connected to the water storage facility through a water suction pipe; wherein: The power unit is a nozzle that rotates around an axis. The nozzle is connected to the water supply pipe. The inside of the nozzle is a cavity, which is connected to the outside through several water spray channels. The outlet at the end of each water spray channel is a water nozzle. The several water spray channels deflect clockwise in the same direction and are symmetrically arranged with the central axis of the nozzle as the center. The water spray channels are linear and enter from the internal cavity at the front end of the nozzle. The water outlet direction is towards the side and rear of the nozzle. The descaling assembly includes a traction spring and a descaling spring. The traction spring is conical, with the small end fixed to the water supply pipe near the nozzle and the large end connected and fixed to the descaling spring. The diameter of the descaling spring is one size larger than the standard inner diameter of the pipe to be cleaned and descaled, and the outer wall of the descaling spring is in close contact with the inner wall of the pipe to be cleaned and descaled. The pressurization equipment is a booster pump that provides the water pressure and volume required for pipeline dredging.

[0007] The water spray channel consists of six channels, each with an axial deflection angle of α (recommended value for α: 60°~85°) and a radial deflection angle of β (recommended value for β: 5°~10°). Water is ejected at high speed from the channels, generating a reaction force along the channel direction. The radial components of the reaction forces generated by the six radially evenly arranged channels on the nozzle cancel each other out, resulting in a zero radial resultant force at the nozzle axis. The axial components do not cancel each other out, and the resultant force after the axial components are superimposed is directed forward along the nozzle axis. This axial resultant force pulls the sludge removal and descaling component forward.

[0008] For a specific nozzle, the axial deflection angle α and radial deflection angle β of each water spray channel are fixed values. Based on these α and β values, the water supply flow rate Q and pressure P required by the power component of the sludge removal and descaling device of the present invention can be calculated and determined.

[0009] The required water flow rate Q (unit: m³ / s) and pressure P (unit: kPa) for the power unit are determined according to the following formulas: F x =Fcosα>F f = μgM2 F y =Fsinα>G=(M1+M3)g In the above formula, F is the reaction force of the nozzle, M1 is the mass of the power component, M2 is the mass of the descaling component, M3 is the mass of the rubber hose and the water contained inside it, d1 is the inner diameter of the rubber hose, and d2 is the orifice diameter of the water flow channel inside the nozzle. x The axial traction force of the nozzle, F y F is the reaction force of the nozzle acting radially on the inner wall of the pipe to be cleaned and descaled. f denoted as μ, which is the frictional force between the descaling spring and the inner wall of the pipe to be cleaned and descaled, where μ is the coefficient of dynamic friction between the descaling spring and the inner wall of the pipe.

[0010] The descaling device also includes a transmission control assembly, which comprises a rubber hose, a pipe reversing device, a hose reel, a brake disc, a speed-regulating motor, a transmission belt, a pressure gauge, and an electromagnetic flow meter. There are two pipe reversing devices, one above the other, with the hose reel positioned in front of each reversing device. The rubber hose is wound around the hose reel, with its rear end connected to the pressurizing equipment and its front end connected to the nozzle. A concentric driven wheel is fixed to the side wall of the hose reel. A transmission wheel is mounted on the power output shaft of the speed-regulating motor, and the transmission wheel and driven wheel are connected and linked via a transmission belt. The brake disc is mounted on the side wall of the hose reel to brake it. The forward speed of the power assembly is controlled by the release speed of the rubber hose, thereby controlling the descaling speed.

[0011] The aforementioned sludge removal and descaling device operates as follows: 1. The pressurizing equipment provides the required water pressure and volume according to the above calculation results. After the high-pressure water enters the nozzle, it flows along the water flow channel and is ejected from the nozzle. The nozzle rotates at high speed and is suspended at the axis position of the pipe to be cleaned and descaled due to the conservation of angular momentum. The reaction force of the jet pulls the nozzle forward, which in turn drives the descaling component to move forward. During this process, the high-pressure water flushes and cleans the inner wall of the pipe to be cleaned and descaled. 2. As the power unit moves forward, the descaling spring of the descaling component is continuously stretched and thinned. The friction between the descaling spring and the inner wall of the pipe to be cleaned gradually decreases until the spring force of the descaling spring is equal to the maximum static friction between the last turn of the descaling spring and the inner wall of the pipe to be cleaned, reaching the limit state. During this process, the descaling spring cleans the inner wall of the pipe to be cleaned through sliding friction. 3. As the power unit continues to move forward, when the traction force on the descaling component exceeds the maximum static friction force between the last coil of the descaling spring and the inner wall of the pipe to be cleaned, the descaling component rapidly retracts and moves forward. The descaling spring generates squeezing and collision between each coil, cleaning the inner wall of the pipe to be cleaned again. During the retraction and forward movement of the descaling component, the descaling spring becomes thicker and the friction force with the inner wall of the pipe to be cleaned gradually increases until the descaling spring comes to rest relative to the pipe. 4. Steps 2 and 3 above constitute one cleaning and descaling cycle. The length of one cycle is the limit of the tensile length of the descaling component. By repeating the cleaning and descaling cycle multiple times, the cleaning and descaling work of a section of pipeline is completed.

[0012] The descaling spring has a diameter one size larger than the standard inner diameter of the pipe, resulting in greater friction. During the stretching process, it is gradually stretched and thinned from front to back. During the stretching process, the maximum static friction between the descaling spring and the pipe wall is reduced to a minimum value until the last turn of the descaling spring. At this point, the maximum static friction is slightly greater than the sliding friction. The total length of the descaling spring and the traction spring is the ultimate stretching length.

[0013] The spray nozzle's water flow channels have a certain water flow deflection angle α along their axial direction. When the water is ejected at high speed, a reaction force is generated along each spray channel. The radial components of the reaction forces generated by the uniformly arranged spray channels on the nozzle cancel each other out, resulting in a zero net radial force at the nozzle's axis. The axial components of the reaction forces generated by the uniformly arranged spray channels on the nozzle cannot cancel each other out; the net force after the axial components are superimposed is directed forward along the nozzle's axis. This forward axial force pulls the nozzle forward, thereby driving the descaling components forward. Simultaneously, the spray nozzle's water flow channels also have a certain water flow deflection angle β along their radial direction. When the water is ejected at high speed, a torque is generated around the nozzle's axis, causing the nozzle to rotate at high speed, increasing the uniformity of the water spray flushing of the pipeline. According to the law of conservation of angular momentum, the high-speed rotation of the nozzle increases its stability at the pipeline's axis.

[0014] The pressure-driven adaptive pipe cleaning and descaling device of the present invention combines mechanical and hydraulic dredging, integrating the advantages of good mechanical dredging effect and high hydraulic dredging efficiency; it consumes less water than high-pressure water jet cleaning, saving water; it has a simpler structure and is easier to operate than traditional mechanical dredging equipment; and it can adapt to various working conditions such as the unevenness of the inner wall of the pipe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the nozzle structure.

[0017] Figure 3 This is a schematic diagram of the axial cross-section of the nozzle.

[0018] Figure 4 This is a schematic diagram of the radial cross-section of the nozzle.

[0019] Figure 5 This is a schematic diagram of the descaling component.

[0020] Figure 6 A schematic diagram showing the installation of the power unit and the descaling unit.

[0021] Figure 7 This is a schematic diagram of the descaling component in a stretched state.

[0022] Figure 8 This is a schematic diagram of the sludge removal and descaling device installation.

[0023] Figure 9 This is a schematic diagram of the transmission control component.

[0024] Among them, 100-power component, 200-descaling component, 300-transmission control component, 400-pressurization equipment, 500-water storage facility, 600-pipe to be cleaned and descaled, 101-spray head, 102-water spray channel, 201-traction spring, 202-descaling spring, 301-rubber hose, 302-pipe reversing device, 303-hose reel, 304-brake disc, 305-speed regulating motor, 306-transmission belt, 307-pressure gauge, 308-electromagnetic flow meter. Detailed Implementation

[0025] Example 1: A pressure-driven adaptive pipeline dredging and descaling device includes a power unit 100, a descaling unit 200, a pressurizing device 400, and a water storage facility 500. The power unit 100 is connected to the pressurizing device 400 via a water supply pipe. The descaling unit 200 is mounted on the power unit 100. The pressurizing device 400 is connected to the water storage facility via a suction pipe. The power unit 100 is a nozzle 101 that rotates around an axis. The nozzle 101 is connected to a water supply pipe. The nozzle 101 has a cavity inside and is connected to the outside through several water spray channels 102. Each water spray channel 102 is connected to a water nozzle. The several water spray channels 102 deflect in the same direction and are symmetrically arranged with the central axis of the nozzle 101 as the center. The water spray channels 102 are linear and enter from the cavity inside the front end of the nozzle 101. The water outlet direction is towards the side and rear of the nozzle 101. The descaling assembly 200 includes a traction spring 201 and a descaling spring 202. The traction spring 201 is conical, with its small front end fixed to the water supply pipe near the nozzle 101, and its large rear end connected and fixed to the descaling spring 202. The diameter of the descaling spring 202 is one size larger than the standard size of the inner diameter of the pipe to be cleaned and descaled, and the outer wall of the descaling spring 202 is in contact with the inner wall of the pipe to be cleaned and descaled. The 400 pressurization device is a booster pump that provides the water pressure and volume required for pipeline dredging.

[0026] There are six water spray channels 102. Each water spray channel 102 has an axial deflection angle of α, which is 85°, and a radial deflection angle of β, which is within the range of 5°. Water is sprayed out at high speed from the water spray channels 102, generating a reaction force along the water spray channels 102. The radial components of the reaction forces generated by the six water spray channels 102 evenly arranged on the nozzle 101 cancel each other out. The resultant radial force at the axis of the nozzle 101 is zero, and the axial components do not cancel each other out. The resultant force after the superposition of the axial components is directed forward along the axis of the nozzle 101. The resultant force of the axial components pulls the sludge removal and descaling component 200 forward.

[0027] The water supply flow required for power component 100 Q (Unit: m³ / s) and pressure P(Unit: kPa), determined by the following formula: F x =Fcosα>F f = μgM2 F y =Fsinα>G=(M1+M3)g In the above formula, F The reaction force of the nozzle 101 is given by the following mass: the mass of the power assembly 100 is M1, the mass of the descaling assembly 200 is M2, the mass of the rubber hose 301 and the water contained within it is M3, the inner diameter of the rubber hose 301 is d1, and the orifice diameter of the water spray channel 102 inside the nozzle 101 is d2. x The axial traction force F of nozzle 101 y F is the reaction force of the nozzle 101 acting radially on the inner wall of the pipe 600 to be cleaned and descaled. f The friction force between the descaling spring 202 and the inner wall of the pipe to be cleaned and descaled is μ, where μ is the coefficient of dynamic friction between the descaling spring 202 and the inner wall of the pipe. The entire power assembly 100 has a mass M1 of 2 kg, the rubber hose 301 has a diameter d1 of 0.05 m, and the nozzle 101 has a water spray channel 102 with a throat diameter d2 of 0.005 m, totaling 6 water spray channels 102. The pipe to be cleaned and descaled 600 is a plastic pipe with an inner diameter of 500 mm. The axial deflection angle of the water spray channel 102 of the pipe to be cleaned and descaled is α = 85°, and the radial deflection angle is β = 5°. The descaling assembly 200 is made of a low-density, high-strength carbon fiber composite material with a density of 1.6 g / cm³. 3 The shear modulus is 50 GPa. The descaling spring 202 is a cylindrical spring with a diameter of 525 mm and a spring material diameter of 10 mm. It is equipped with 5 coils of traction spring 201 and 10 coils of descaling spring 202, for a total of 15 coils. The diameter of the descaling spring 202 is slightly larger than the inner diameter of the pipe 600 to be cleaned and descaled. When the descaling spring 202 is inserted, the external force stretches it, making the diameter of the descaling spring 202 smaller, so that the descaling spring 202 can be inserted into the pipe 600 to be cleaned and descaled. After the external force is reduced, the descaling spring 202 returns to its original position and sticks tightly to the pipe wall. The descaling and descaling are performed by friction between the descaling spring 202 and the pipe wall. The coefficient of dynamic friction between the descaling component 200 and the pipe 600 to be cleaned and descaled is 0.12.

[0028] Based on the above basic parameters, the descaling component 200 is selected with 15 turns, a winding ratio of 50, a mean diameter of 0.5, and a stiffness of 0.03 N / mm; the sliding friction force F of the last turn of the descaling spring 202 is... f=0.23kN, the weight of the power component 100 and the transmission and control component 300 is G=23.68kN. Calculations determine that the power component 100 needs to provide a pressure P=1.5MPa and a water supply flow rate Q=0.02m³ / h. 3 / s.

[0029] The descaling device also includes a transmission control component 300, which includes a rubber hose 301, a pipe reversing device 302, a hose reel 303, a brake disc 304, a speed-regulating motor 305, a transmission belt 306, a pressure gauge 307, and an electromagnetic flowmeter 308. There are two pipe reversing devices 302, one above the other. The hose reel 303 is located at the front of the pipe reversing device 302. The rubber hose 301 is wound around the hose reel 303. The rear end of the rubber hose 301 is connected to the pressurizing device 400, and the front end is connected to the nozzle 101. A concentric driven wheel is fixed on the side wall of the hose reel 303. A transmission wheel is installed on the power output shaft of the speed-regulating motor 305. The transmission wheel and the driven wheel are connected and linked by the transmission belt 306. The brake disc 304 is installed on the side wall of the hose reel 303, and the hose reel 303 is braked by friction.

[0030] The sludge removal and descaling device operates as follows: 1. The pressurizing device 400 provides the required water pressure and volume according to the above calculation results. After the high-pressure water enters the nozzle 101, it flows along the water flow channel 102 and is ejected from the nozzle. This causes the nozzle 101 to rotate at high speed and be suspended at the axial position of the pipe 600 to be cleaned and descaled. The reaction force of the jet pulls the nozzle 101 forward, which in turn drives the descaling component 200 to move forward. During this process, the high-pressure water flushes and cleans the inner wall of the pipe 600 to be cleaned and descaled. 2. As the power assembly 100 moves forward, the descaling spring 202 of the descaling assembly 200 is continuously stretched and thinned. The friction between the descaling spring 202 and the inner wall of the pipe 600 to be cleaned gradually decreases until the elastic force of the descaling spring 202 is equal to the static friction between the last turn of the descaling spring 202 and the inner wall of the pipe 600 to be cleaned, reaching the limit state. During this process, the descaling spring 202 cleans the inner wall of the pipe 600 to be cleaned through friction. 3. As the power component 100 continues to move forward, when the traction force on the descaling component 200 exceeds the static friction force between the last turn of the descaling spring 202 and the inner wall of the pipe 600 to be cleaned and descaled, the descaling component 200 rapidly retracts and moves forward. The descaling spring 202 generates squeezing and collision between each turn, cleaning the inner wall of the pipe 600 to be cleaned and descaled again. During the retraction and forward movement of the descaling component 200, the descaling spring 202 becomes thicker and the friction force between it and the inner wall of the pipe 600 to be cleaned and descaled gradually increases until the descaling spring 202 comes to rest relative to the pipe 600 to be cleaned and descaled. 4. The speed-regulating motor 305 controls the release speed of the rubber hose reel 303, while the brake disc 304 provides auxiliary control; by controlling the release speed of the rubber hose reel 303, the forward speed of the high-pressure rotary nozzle 101 is controlled. 5. Steps 2 and 3 above constitute one cleaning and descaling cycle. By repeating the action through multiple cleaning and descaling cycles, the cleaning and descaling work of a section of pipeline is completed.

[0031] The descaling component 200 is 6.96m long, and the sludge removal length in one sludge removal stroke is 23.55m. Each 100m of pipe to be sludged and descaled requires four strokes to complete.

Claims

1. A pressure-driven rotary jet adaptive pipeline dredging and descaling device, characterized in that... The sludge removal and descaling device includes a power unit, a descaling unit, a pressurizing device, and a water storage facility. The power unit is connected to the pressurizing device via a water supply pipe. The descaling unit is installed on the power unit. The pressurizing device is connected to the water storage facility via a suction pipe. The power unit is a nozzle that rotates around an axis. The nozzle is connected to the water supply pipe. The inside of the nozzle is a cavity, which is connected to the outside through several water spray channels. Each water spray channel is connected to a water nozzle at its end. The several water spray channels deflect clockwise in the same direction and are symmetrically arranged with the central axis of the nozzle as the center. The water spray channels are linear and enter from the cavity inside the front end of the nozzle. The water outlet direction is towards the side and rear of the nozzle. The descaling assembly includes a traction spring and a descaling spring. The traction spring is conical, with the small end fixed to the water supply pipe near the nozzle and the large end connected and fixed to the descaling spring. The diameter of the descaling spring is one size larger than the standard size of the inner diameter of the pipe to be cleaned and descaled, and the outer wall of the descaling spring is in close contact with the inner wall of the pipe to be cleaned and descaled. The pressurization equipment is a booster pump that provides the water pressure and volume required for pipeline dredging.

2. The pressure-driven adaptive pipeline dredging and descaling device as described in claim 1, characterized in that... The water spray channel consists of six channels, each with an axial deflection angle of α (recommended value for α: 60°~85°) and a radial deflection angle of β (recommended value for β: 5°~10°). Water is ejected at high speed from the channels, generating a reaction force along the channels. The radial components of the reaction forces generated by the six radially evenly arranged channels on the nozzle cancel each other out, resulting in a zero radial resultant force at the nozzle axis. The axial components do not cancel each other out, and the resultant force after the axial components are superimposed is directed forward along the nozzle axis. This axial resultant force pulls the sludge removal and descaling component forward.

3. The pressure-driven adaptive pipeline dredging and descaling device as described in claim 1, characterized in that... The required water flow rate Q (m³ / s) and pressure P (kPa) for the power unit are determined according to the following formulas: F x =Fcosα >F f = μgM2 F y =Fsinα > G=(M1+M3)g In the above formula, F is the reaction force of the nozzle, M1 is the mass of the power component, M2 is the mass of the descaling component, M3 is the mass of the rubber hose and the water contained inside it, d1 is the inner diameter of the rubber hose, and d2 is the orifice diameter of the water flow channel inside the nozzle. x The axial traction force of the nozzle, F y F is the reaction force of the nozzle acting radially on the inner wall of the pipe to be cleaned and descaled. f denoted as μ, which is the frictional force between the descaling spring and the inner wall of the pipe to be cleaned and descaled, where μ is the coefficient of dynamic friction between the descaling spring and the inner wall of the pipe.

4. The pressure-driven adaptive pipeline dredging and descaling device as described in claim 1, characterized in that... The descaling device also includes a transmission control assembly, which comprises a rubber hose, a pipe reversing device, a hose reel, a brake disc, a speed-regulating motor, a transmission belt, a pressure gauge, and an electromagnetic flow meter. There are two pipe reversing devices, one above the other, with the hose reel positioned in front of each reversing device. The rubber hose is wound around the hose reel, with its rear end connected to the pressurizing equipment and its front end connected to the nozzle. A concentric driven wheel is fixed to the side wall of the hose reel. A transmission wheel is mounted on the power output shaft of the speed-regulating motor, and the transmission wheel and driven wheel are connected and linked via a transmission belt. The brake disc is mounted on the side wall of the hose reel to brake it. The forward speed of the power assembly is controlled by the release speed of the rubber hose, thereby controlling the descaling speed.

5. The pressure-driven adaptive pipeline dredging and descaling device as described in claim 1, characterized in that... The aforementioned sludge removal and descaling device operates as follows: 1) The pressurizing equipment provides the required water pressure and volume according to the above calculation results. After the high-pressure water enters the nozzle, it flows along the water flow channel and is ejected from the nozzle. The nozzle rotates at high speed and is suspended at the axis position of the pipe to be cleaned and descaled due to the conservation of angular momentum. The reaction force of the jet pulls the nozzle forward, which in turn drives the descaling component to move forward. During this process, the high-pressure water flushes and cleans the inner wall of the pipe to be cleaned and descaled. 2) As the power unit moves forward, the descaling spring of the descaling component is continuously stretched and thinned, and the friction between the descaling spring and the inner wall of the pipe to be cleaned and descaled gradually decreases until the elastic force of the descaling spring is equal to the maximum static friction between the last turn of the descaling spring and the inner wall of the pipe to be cleaned and descaled, reaching the limit state; during this process, the descaling spring cleans the inner wall of the pipe to be cleaned and descaled through sliding friction. 3) As the power unit continues to move forward, when the traction force on the descaling component exceeds the maximum static friction force between the last coil of the descaling spring and the inner wall of the pipe to be cleaned, the descaling component rapidly retracts and moves forward. The descaling spring generates squeezing and collision between each coil, cleaning the inner wall of the pipe to be cleaned again. During the retraction and forward movement of the descaling component, the descaling spring becomes thicker and the friction force with the inner wall of the pipe to be cleaned gradually increases until the descaling spring comes to rest relative to the pipe to be cleaned. 4) Steps 2 and 3 above constitute one cleaning and descaling cycle. The length of one cycle is the limit stretch length of the descaling component. By repeating the action through multiple cleaning and descaling cycles, the cleaning and descaling work of a section of pipeline is completed.

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