Blind end pollutant control device and blind end pollutant control method

Abstract

The invention discloses a blind end pollutant control device and a blind end pollutant control method, and relates to the field of water supply quality maintenance. The problems that due to the fact that the installation position of an existing spoiler is fixed, the existing spoiler cannot be suitable for blind end branch pipe dirt control in different use environments, and the blind end pollutant cleaning efficiency is low are solved. Under the daily water supply condition, the spoiler suitable for the daily water supply condition is installed at the joint of the blind end and the main pipe through the main pipe attaching rail. Under the condition that the pipeline is cleaned, the turbulator suitable for the daily water supply condition is taken down, and the turbulator suitable for the pipeline cleaning condition is installed at the joint of the blind end and the main pipe through the main pipe attaching rail. And after pipeline cleaning is finished, the spoiler suitable for the pipeline cleaning condition is taken down, and the spoiler suitable for the daily water supply condition is installed again. The method is used for blind end pollutant control.

Description

Technical Field

[0001] The present invention relates to the field of water quality maintenance of water supply, and in particular to a blind-end pollutant control device and a blind-end pollutant control method, which are used for controlling and cleaning pollutants at the blind ends of water supply network pipelines. Background Art

[0002] With the acceleration of urbanization, the safe and stable operation of water supply network as an important part of urban infrastructure is directly related to the daily life and production activities of urban residents. In the branch of water supply network, due to the slow water flow and long water age, it is easy to become the area where pollutants are retained and water quality deteriorates, thus affecting the water quality safety of the entire water supply system, which is the so-called blind end.

[0003] Traditional pipeline cleaning methods, such as manual cleaning, ice slurry cleaning technology and air-water pulse cleaning technology, can reduce pollutants in blind ends to a certain extent, but these methods have shortcomings such as low efficiency, high energy consumption, high cost and long water outage time. The physical damage to the pipeline network and the risk of secondary pollution of water quality cannot be ignored.

[0004] In recent years, in order to control the diffusion of pollutants at blind ends more economically and effectively, researchers have begun to explore physical methods based on the principles of fluid mechanics, such as installing spoilers at blind ends to change the state of water flow, thereby controlling the diffusion of pollutants. For example: Harbin Institute of Technology's 2023 master's thesis published "Research on the Impact of Spoilers on the Diffusion of Pollutants at Blind Ends of Water Supply Pipelines", which mainly gave a theoretical spoiler, which consists of a right-angled triangle block and an "L"-shaped plate body, wherein the "L"-shaped plate body is connected to the main stream pipeline, one of the right-angled sides of the right-angled triangle block is installed on the "L"-shaped plate body, and the hypotenuse of the right-angled triangle block faces the direction of the main pipe flow.

[0005] The spoiler creates a cavity structure in the turbulent flow, weakening the mixing characteristics between the blind branch and the main pipe. Therefore, the shear layer of the incoming flow crosses the cavity and does not directly impact the fluid inside the blind branch. The degree of flow disturbance on the blind end dirt is adjusted by setting the angle between the slope of the right triangle block and the incoming flow, so as to prevent the release of dirt or reduce the diffusion of pollutants to the main pipe. However, due to its fixed installation position and inconvenient disassembly, it is impossible to adjust the degree of flow disturbance of the blind branch according to different use cycles, different diameters, and different pollution conditions, resulting in low efficiency in cleaning blind end pollutants.

[0006] In summary, the existing spoiler is fixed in installation position and inconvenient to disassemble, resulting in the problem that it is not applicable to the control of dirt in the blind-end branch pipe under different usage environments, and the efficiency of cleaning the blind-end pollutants is low. Summary of the invention

[0007] The purpose of the present invention is to solve the problem that the existing spoiler is not suitable for blind-end branch pipe dirt control in different usage environments due to its fixed installation position, and the efficiency of cleaning blind-end pollutants is low, and further to provide a blind-end pollutant control device and a blind-end pollutant control method to effectively control the diffusion of pollutants inside the blind end to the main pipe and the technical problem of low efficiency in cleaning blind-end pollutants.

[0008] The technical solution of the present invention is:

[0009] A blind-end pollutant control device comprises a main pipe fitting track and a spoiler. The main pipe fitting track is installed on the main pipe along the length direction of the main pipe, and the installation position of the main pipe fitting track is close to the pipe mouth of the blind end. The spoiler is first slidably installed on the main pipe fitting track, and a water flow passage is reserved between the spoiler and the main pipe; the spoiler comprises a sealing layer, a main pipe fitting plate, a spoiler and an anti-backflow plate. The sealing layer, the main pipe fitting plate, the anti-backflow plate and the spoiler are sequentially connected from top to bottom to form a closed three-dimensional structure. The outer circumferential surface of the main pipe fitting track and the inner wall of the main pipe are sealed and bonded by the sealing layer, and the lower part of the main pipe fitting track and the closed three-dimensional structure after the final fixed position is determined are sealed and bonded by the sealing layer.

[0010] Furthermore, a long strip-shaped groove is provided at the lower part of the main pipe which is in contact with the track.

[0011] Preferably, a protrusion is provided on the upper portion of the main pipe laminating plate, the protrusion is slidably connected to the groove, and the lower portion of the main pipe laminating plate is an arc-shaped strip.

[0012] Preferably, the longitudinal cross-section of the closed three-dimensional structure is a right triangle, and the upper end surface of the backflow prevention plate is fixedly connected to the arc-shaped slats.

[0013] Furthermore, the spoiler is a long strip plate and is installed on the lower edge of the main pipe bonding plate and the anti-backflow plate, and the inclined surface of the spoiler faces the incoming flow direction.

[0014] Furthermore, the inclination angle of the spoiler is:

[0015] (1) Daily water supply:

[0016] H≥0.74D·Re -0.2 ①

[0017] (2) When cleaning the pipeline:

[0018] H<0.74D·Re -0.2 ②

[0019] Wherein, H is the maximum height of the anti-backflow plate, D is the nominal diameter of the main pipe, and Re is the Reynolds number.

[0020] Preferably, in the case of daily water supply, H = 1.48D·Re -0.2 , the inclination angle of the spoiler is 30°.

[0021] Preferably, when the pipeline is cleaned, H = 0.22D·Re -0.2 , the inclination angle of the spoiler is 45°.

[0022] The present invention also provides a method for controlling blind-end pollutants, which includes a blind-end pollutant control device. The method for controlling blind-end pollutants specifically comprises the following steps:

[0023] Step 1: Paste the appropriate type of main pipe fitting track onto the wall of the main pipe;

[0024] Step 2: Install the spoiler on the main pipe fitting track;

[0025] Step 21: When the use environment is under daily water supply conditions:

[0026] The spoiler suitable for daily water supply is installed at the connection between the blind end and the main pipe through the main pipe fitting track;

[0027] Step 22: When the use environment is pipeline cleaning:

[0028] Remove the spoiler applicable to daily water supply, and install the spoiler applicable to pipeline cleaning at the connection between the blind end and the main pipe through the main pipe fitting track;

[0029] Step 23: After the pipeline cleaning is completed, remove the spoiler suitable for pipeline cleaning and reinstall the spoiler suitable for daily water supply. At this point, by replacing different spoilers, it is possible to achieve daily control of the release of blind-end pollutants and promote the discharge of blind-end pollutants to achieve cleaning.

[0030] Compared with the prior art, the present invention has the following effects:

[0031] 1. Take the daily water supply situation as an example. At this time, the inclination angle of the spoiler 23 of the spoiler is 30°, and the distance between the anti-backflow plate 24 and the main pipe M is relatively small (referring to the daily water supply situation and the pipeline cleaning situation). When the main pipe flow passes through the spoiler, the cross-sectional area of ​​the main pipe is reduced, which increases the instantaneous flow velocity of the fluid downstream of the main pipe, reduces the rotation intensity of the vortex inside the blind end, and weakens the mixing effect of pollutants and fluids. A counterclockwise vortex is formed at the connection between the blind end and the main pipe after the spoiler, allowing the fluid flowing from the inside of the blind end to the main pipe to flow back to the inside of the blind end, effectively controlling the diffusion of pollutants inside the blind end to the main pipe, and reducing the risk of deterioration of drinking water quality in the water supply network.

[0032] 2. Take the pipeline cleaning situation as an example. At this time, the inclination angle of the spoiler 23 of the spoiler is 45°, and the distance between the backflow prevention plate 24 and the main pipe M is relatively large. The counterclockwise vortex formed at the connection between the blind end and the main pipe after the spoiler makes the fluid flowing from the inside of the blind end to the main pipe more exposed outside the blind end, and more pollutants inside the blind end are carried away by the flow from the main pipe, effectively improving the efficiency of pipeline cleaning.

[0033] 3. The present invention provides the selection methods of the inclination angle of the spoiler 23 and the maximum height of the anti-backflow plate 24 in daily water supply and pipeline cleaning conditions, which is equivalent to providing different inclination angles and maximum height parameters in various use environments, that is, providing various types of spoilers, which are suitable for blind-end branch pipe dirt control in different use environments. It is not only suitable for daily water supply conditions, but also suitable for use in pipeline cleaning.

[0034] 4. The main pipe, the main pipe fitting track 1 and the spoiler 2 of the present invention are connected by gluing, which is low in cost, more convenient to disassemble and simple to maintain. The local head loss caused by installing the blind-end pollution control device is almost negligible compared with the head loss along the main pipe.

[0035] 5. When cleaning the blind end, the present invention promotes the discharge of pollutants by determining the parameters of the spoiler 23 and the anti-backflow plate 24, thereby improving the efficiency of cleaning the pollutants in the blind end. In addition, the present invention breaks through the limitation that the maximum height of the anti-backflow plate 24 must be higher than the boundary layer thickness (the viscosity of the drinking water flowing in the water supply pipe is relatively low. When it flows through the water supply pipe, the influence of viscosity is limited to the thin layer close to the pipe wall. Outside this thin layer, the influence of viscosity can be ignored. Each surface forms a velocity gradient zone from zero wall velocity to the outflow velocity in this thin layer. This thin layer is called the boundary layer.) This overcomes the difficulty in the study that the flow field changes near the spoiler are difficult to clearly observe when the maximum height of the anti-backflow plate 24 is too small. In the range where the maximum height of the anti-backflow plate 24 is less than the boundary layer, it is found that the spoiler promotes the diffusion of pollutants in the blind end, and continues to optimize the two key parameters of the spoiler inclination angle and the maximum height of the anti-backflow plate in the spoiler with the purpose of improving the pipeline cleaning efficiency. Explanation of the drawings

[0036] Figure 1 is a schematic structural diagram of a blind-end pollutant control device according to an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of a state where a blind-end pollution control device according to an embodiment of the present invention is installed in a pipeline under a normal water supply condition;

[0038] Figure 3It is a schematic diagram of the state of the blind-end pollution control device of an embodiment of the present invention being installed in a pipeline when the pipeline is cleaned.

[0039] Description of reference numerals:

[0040] 1. Main pipe fitting track; 2. Spoiler; 21. Sealing layer; 22. Main pipe fitting plate; 23. Spoiler; 24. Anti-backflow plate; D. Blind end; M. Main pipe; R. Counterclockwise vortex; P. Pollutant. DETAILED DESCRIPTION

[0041] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described, and the present embodiment includes a main pipe fitting track 1 and a spoiler 2. The main pipe fitting track 1 is installed on the main pipe M along the length direction of the main pipe, and the installation position of the main pipe fitting track 1 is close to the pipe mouth of the blind end D. The spoiler 2 is first slidably installed on the main pipe fitting track 1, and a water flow passage is left between the spoiler 2 and the main pipe M; the spoiler 2 includes a sealing layer 21, a main pipe fitting plate 22, a spoiler 23 and an anti-backflow plate 24. The sealing layer 21, the main pipe fitting plate 22, the anti-backflow plate 24 and the spoiler 23 are sequentially connected from top to bottom to form a closed three-dimensional structure. The outer circumferential surface of the main pipe fitting track 1 and the inner wall of the main pipe M are sealed and bonded by the sealing layer 21, and the lower part of the main pipe fitting track 1 and the closed three-dimensional structure after the final fixed position is determined are sealed and bonded by the sealing layer 21.

[0042] The present embodiment proposes a blind-end pollutant control device, which is a closed three-dimensional structure formed by the sealing layer 21, the main pipe bonding plate 22, the anti-backflow plate 24 and the spoiler 23, and the closed three-dimensional structure does not have any redundant plate body at the connection. The rubber sealing layer is pasted on the side of the main pipe bonding plate that contacts the main pipe bonding track, so that there is no gap between the main pipe bonding plate and the main pipe bonding track. The spoiler forms a certain angle with the main pipe bonding plate, so that the spoiler can change the flow path of the main pipe incoming flow, and form a cavity structure at the connection between the blind end and the main pipe for the incoming flow to pass through.

[0043] The anti-backflow plate of this embodiment is a planar structure perpendicular to the pipe wall. It can be connected to the main pipe fitting plate 22 and the spoiler 23 without leaving any excess plate body. It can prevent the main pipe flow that has reached the spoiler from flowing back to the front of the spoiler, thereby avoiding further accumulation and diffusion of pollutants in the main pipe.

[0044] The blind-end pollutant control devices in this embodiment are all made of corrosion-resistant, high-strength materials to ensure long-term operational stability and durability.

[0045] The sealing layer 21 in this embodiment is made of non-toxic, non-corrosive, and highly adhesive glue to stick the main pipe fitting track on the main pipe wall and the rubber sealing layer on the main pipe fitting plate. When the user uses the water in the main pipe, it will not cause harm to the human body, and it can ensure that the spoiler 2 is more firmly connected to prevent it from being infallible, because the shear force generated by the water flow in the water supply pipe is not large enough to wash it away, and many leak repair methods also use glue.

[0046] The spoiler 2 is installed by sliding the protrusion of the main pipe fitting plate 22 along the groove of the main pipe fitting track 1, so that the spoiler 2 is fixed on the main pipe wall at the connection between the blind end and the main pipe where the main pipe incoming flow first arrives, and the anti-backflow plate 24 is aligned with the tangent of the blind end wall. The sliding installation method of the main pipe fitting plate 22 and the main pipe fitting track 1 can realize the free loading and unloading of different models of the spoiler 2 to meet the different needs of reducing the diffusion of pollutants inside the blind end to the main pipe or improving the efficiency of pipeline cleaning in actual operating conditions.

[0047] Specific implementation method 2: Combination Figures 1 to 3 To explain this embodiment, a long strip groove is provided at the bottom of the main pipe fitting track 1 of this embodiment. This arrangement is used to cooperate with the protrusion provided on the upper part of the main pipe fitting plate 22 to realize the sliding connection between the spoiler 2 and the main pipe fitting track 1. The sliding connection is mainly used to determine the specific position of the spoiler 2 before the spoiler 2 is fixed on the main pipe fitting track 1. The sliding process is the process of selecting the position determination. After the specific position is determined, the main pipe fitting plate 22 and the main pipe fitting track 1 are fixed through the sealing layer. The other components and implementation methods are the same as the specific implementation method one.

[0048] Specific implementation method three: Combination Figure 1 To explain this embodiment, the upper portion of the main pipe bonding plate 22 of this embodiment is provided with a protrusion, the protrusion is slidably connected with the groove, and the lower portion of the main pipe bonding plate 22 is an arc-shaped strip.

[0049] In this configuration, the main pipe fitting track has a groove, the main pipe fitting plate has a protrusion, and the protrusion of the main pipe fitting plate can slide along the groove of the main pipe fitting track, so that the spoiler is fixed in a specific position. Other components and connection relationships are the same as those of the first or second specific embodiments.

[0050] In this embodiment, the protrusion of the main pipe fitting plate slides along the groove of the main pipe fitting track, so that the spoiler is fixed on the main pipe wall at the connection between the blind end and the main pipe where the main pipe flow first reaches, and the anti-backflow plate is aligned with the tangent of the blind end wall, which can maximize the impact on the main pipe flow, reduce the diffusion of pollutants inside the blind end to the main pipe, or improve the pipeline cleaning efficiency.

[0051] Specific implementation method four: Combination Figures 2 to 3 To explain this embodiment, the longitudinal cross-section of the spoiler 2 of this embodiment is a right triangle, and the upper end surface of the anti-backflow plate 24 is fixedly connected to the arc-shaped strip.

[0052] Such a configuration is used to meet the incoming flow, reduce the water flow passing area in front of the blind end, and ensure the reliability of the spoiler connection. The other components and connection relationships are the same as any one of the specific implementation modes one to three.

[0053] Specific implementation method five: Combination Figures 2 to 3 To explain this embodiment, the spoiler 23 of this embodiment is a long strip plate and is installed on the lower edge of the main pipe bonding plate 22 and the anti-backflow plate 24, and the inclined surface of the spoiler 23 faces the incoming flow direction.

[0054] Such arrangement facilitates the disturbing effect on the incoming flow. The other components and connection relationships are the same as any one of the specific implementation modes 1 to 4.

[0055] When the spoiler is not installed, under normal circumstances, the pollutants inside the blind end will be affected by the flow from the main pipe, and a large amount of them will flow into the main pipe, causing secondary water pollution; under pipeline cleaning conditions, the rate at which the pollutants inside the blind end diffuse into the main pipe is difficult to achieve the purpose of completely cleaning the blind end in a short period of time. Therefore, it is necessary to install a spoiler at the connection between the main pipe and the blind end to change the original water flow line, so as to prevent the diffusion of pollutants in the blind end or improve the efficiency of pipeline cleaning.

[0056] After the spoiler is installed, the spoiler lifts the boundary layer of the main pipe flow, and flow separation occurs behind the spoiler to form a cavity structure. The cavity structures formed by spoilers with different parameters have different characteristics: when the bevel angle of the spoiler plate 23 of the spoiler is 30°, the maximum height of the spoiler is relatively large (compared with the daily water supply situation and the pipeline cleaning situation). When the main pipe flow passes through the spoiler, the cross-sectional area of ​​the main pipe is reduced, which increases the instantaneous flow velocity of the fluid downstream of the main pipe, reduces the rotation intensity of the vortex inside the blind end, and weakens the mixing effect of pollutants and fluid. A counterclockwise vortex is formed at the connection between the blind end and the main pipe, allowing the fluid flowing from the inside of the blind end to the main pipe to flow back into the blind end, effectively controlling the diffusion of pollutants inside the blind end to the main pipe, and reducing the risk of deterioration of drinking water quality in the water supply network; when the hypotenuse angle of the spoiler plate 23 of the spoiler is 45°, the maximum height of the spoiler is relatively small, and the counterclockwise vortex formed at the connection between the blind end and the main pipe after the spoiler makes the fluid flowing from the inside of the blind end to the main pipe more exposed outside the blind end, and more pollutants inside the blind end are carried away by the main pipe flow, effectively improving the efficiency of pipeline cleaning.

[0057] Specific implementation method six: Combination Figures 1 to 3To illustrate this embodiment, the inclination angle of the spoiler 23 of this embodiment is:

[0058] (1) Daily water supply:

[0059] H≥0.74D·Re -0.2 ①

[0060] (2) When cleaning the pipeline:

[0061] H<0.74D·Re -0.2 ②

[0062] Wherein, H is the maximum height of the anti-backflow plate 24, D is the nominal diameter of the main pipe, and Re is the Reynolds number.

[0063] In this way, by limiting the selection principle of spoiler size parameters, a series of models of the main pipe fitting track and the spoiler are designed to be suitable for water supply pipes with different pipe diameters. Other components and connection relationships are the same as any one of the specific implementation methods one to five.

[0064] The present embodiment designs a series of models of the main pipe fitting rail 1 and the spoiler 2 to be suitable for water supply pipes of different diameters and to meet different requirements of reducing the diffusion of pollutants inside the blind end to the main pipe or improving the pipe cleaning efficiency in actual operating conditions.

[0065] The maximum height of the anti-backflow plate 24 and the inclination angle of the spoiler 23 are optimized according to different applicable situations. The applicable situations of the optimized design include two kinds, the first is to reduce the diffusion of pollutants inside the blind end to the main pipe, and the second is to improve the efficiency of pipeline cleaning.

[0066] When the spoiler is not installed, under normal circumstances, the pollutants inside the blind turbulence will be affected by the flow from the main pipe, and a large amount of them will flow into the main pipe, causing secondary water pollution; under pipeline cleaning conditions, the rate at which the pollutants inside the blind end diffuse into the main pipe is difficult to achieve the purpose of completely cleaning the blind end in a short time. Therefore, it is necessary to install a spoiler at the connection between the main pipe and the blind end to change the original water flow line, so as to prevent the diffusion of pollutants in the blind end or improve the efficiency of pipeline cleaning.

[0067] After the spoiler is installed, the spoiler lifts the boundary layer of the main pipe flow, and flow separation occurs behind the spoiler to form a cavity structure. The cavity structures formed by spoilers with different parameters have different characteristics: when the bevel angle of the spoiler plate 23 of the spoiler is 30°, the maximum height of the spoiler is relatively large (compared with the daily water supply situation and the pipeline cleaning situation). When the main pipe flow passes through the spoiler, the cross-sectional area of ​​the main pipe is reduced, which increases the instantaneous flow velocity of the fluid downstream of the main pipe, reduces the rotation intensity of the vortex inside the blind end, and weakens the mixing effect of pollutants and fluid. A counterclockwise vortex is formed at the connection between the blind end and the main pipe, allowing the fluid flowing from the inside of the blind end to the main pipe to flow back into the blind end, effectively controlling the diffusion of pollutants inside the blind end to the main pipe, and reducing the risk of deterioration of drinking water quality in the water supply network; when the hypotenuse angle of the spoiler plate 23 of the spoiler is 45°, the maximum height of the spoiler is relatively small, and the counterclockwise vortex formed at the connection between the blind end and the main pipe after the spoiler makes the fluid flowing from the inside of the blind end to the main pipe more exposed outside the blind end, and more pollutants inside the blind end are carried away by the main pipe flow, effectively improving the efficiency of pipeline cleaning.

[0068] For blind-end pollutants, existing research focuses on preventing pollutants from diffusing into the main pipe. This can effectively avoid secondary contamination of drinking water quality under normal circumstances, which accounts for most of the pipeline operation time. The parameters of the spoiler were designed during the experiment with this goal in mind. Therefore, no possibility of using the spoiler to improve pipeline cleaning efficiency was found.

[0069] In addition, existing papers use PIV to observe the flow field changes near the spoiler. Due to the limitations of the PIV observation window used, it can only observe the flow field changes near the larger spoiler, so no experiments are conducted on the smaller spoiler.

[0070] During the research and development process, the present invention has broken through the limitation that the maximum height of the anti-backflow plate 24 must be higher than the thickness of the boundary layer, and overcomes the difficulty of using PIV to clearly observe the flow field changes near the spoiler when the maximum height of the anti-backflow plate 24 is too low. It is found that when the maximum height of the spoiler of the spoiler is set lower than the boundary layer, it has a promoting effect on the diffusion of pollutants in the blind end into the main pipe, which can just promote the efficiency of pipeline cleaning. Therefore, a new function is given to the spoiler, and its design parameters are optimized with the goal of promoting pipeline cleaning efficiency.

[0071] Specific implementation method seven: Combination Figure 2 The present embodiment is described. In the case of daily water supply in the present embodiment, H = 1.48D·Re -0.2 The inclination angle of the spoiler 23 is 30°.

[0072] This arrangement can achieve the best pollutant control effect and reduce the diffusion of pollutants inside the blind end to the main pipe by more than 60%. Other components and connection relationships are the same as any one of the specific embodiments 1 to 6.

[0073] Under daily water supply conditions, when the incoming flow from the main pipe passes through the spoiler 2, the cross-sectional area of ​​the main pipe is reduced, which increases the instantaneous flow velocity of the fluid downstream of the main pipe, reduces the rotation intensity of the vortex inside the blind end, and weakens the mixing effect of pollutants and the fluid. A counterclockwise vortex is formed at the connection between the blind end and the main pipe after the spoiler 2, allowing the fluid flowing from the inside of the blind end to the main pipe to flow back into the blind end, effectively controlling the diffusion of pollutants inside the blind end to the main pipe and reducing the risk of deterioration of drinking water quality in the water supply network.

[0074] Specific implementation method eight: Combination Figure 3 This embodiment is described. In the case of pipeline cleaning in this embodiment, H = 0.22D·Re -0.2 The inclination angle of the spoiler 23 is 45°.

[0075] This arrangement can achieve the best effect of improving the pipeline cleaning efficiency. It can increase the diffusion of pollutants inside the blind end to the main pipe by more than 60%. Other components and connection relationships are the same as any one of the specific implementation methods one to seven.

[0076] In the case of pipeline cleaning, the counterclockwise vortex formed at the connection between the blind end and the main pipe after the spoiler 2 of the present invention allows the fluid flowing from the inside of the blind end to the main pipe to be more exposed outside the blind end, and more pollutants inside the blind end are carried away by the flow from the main pipe, effectively improving the efficiency of pipeline cleaning.

[0077] The present invention has the advantages of low cost, convenient installation and replacement, simple maintenance, etc., and the local water head loss caused by installing the blind-end pollution control device is almost negligible compared with the water head loss along the main pipe.

[0078] Specific implementation method nine: Combination Figures 1 to 3 This embodiment is described. This embodiment includes a blind-end pollutant control device according to any one of claims 1 to 8, and its blind-end pollutant control method specifically comprises the following steps:

[0079] Step 1: Paste the main pipe fitting track 1 of a suitable model onto the pipe wall of the main pipe M;

[0080] Step 2: Install the spoiler 2 on the main pipe fitting track 1;

[0081] Step 21: When the use environment is under daily water supply conditions:

[0082] The spoiler 2 suitable for daily water supply is installed at the connection between the blind end and the main pipe M through the main pipe fitting track 1;

[0083] Step 22: When the use environment is pipeline cleaning:

[0084] Remove the spoiler 2 applicable to daily water supply, and install the spoiler 2 applicable to pipeline cleaning at the connection between the blind end and the main pipe M through the main pipe fitting track 1;

[0085] Step 23: After the pipeline cleaning is completed, remove the spoiler 2 suitable for pipeline cleaning and reinstall the spoiler 2 suitable for daily water supply. At this point, by replacing different spoilers 2, it is possible to achieve daily control of the release of blind-end pollutants and promote the discharge of blind-end pollutants to achieve cleaning.

[0086] Combination Figure 1-Figure 3 The embodiment of the present invention is described as follows: The blind end generally exists at the end of the water supply network. At this time, the diameter of the blind end and the main pipe connected thereto is relatively small, generally about DN100. Therefore, the diameter of the main pipe and the diameter of the blind end in the embodiment are DN100. The angle of the spoiler is 30 degrees in daily use, and the angle of the spoiler is 45 degrees during cleaning.

[0087] The embodiment of the present invention provides a blind-end pollutant control device for being placed in a pipeline, comprising a main pipe fitting track 1 and a spoiler 2. The spoiler 2 comprises a sealing layer 21, a main pipe fitting plate 22, a spoiler 23 and an anti-backflow plate 24, wherein the sealing layer 21 is a rubber sealing layer. The main pipe fitting plate 22, the spoiler 23 and the anti-backflow plate 24 are connected to each other to form a closed three-dimensional structure, and there is no redundant plate body at the connection. The main pipe fitting track 1 has a groove, and the main pipe fitting plate 22 has a protrusion, and the protrusion of the main pipe fitting plate 22 can slide along the groove of the main pipe fitting track 1, so that the main pipe fitting plate 22 is fixed in a specific position. The rubber sealing layer 21 is adhered to the side of the main pipe fitting plate 22 that contacts the main pipe fitting track 1, so that there is no gap between the main pipe fitting plate 22 and the main pipe fitting track 1. The spoiler 2 forms a certain angle with the main pipe fitting plate 22 (30-60 degrees, so as to lift the boundary layer of the main pipe flow and cause flow separation after the spoiler), so that the spoiler 23 can change the flow path of the main pipe flow, and form a cavity structure at the connection between the blind end D and the main pipe M. The anti-backflow plate 24 can prevent the main pipe flow that has reached the spoiler 2 from flowing back to the front of the spoiler 2, thereby avoiding further accumulation and diffusion of pollutants P in the main pipe M.

[0088] In addition, by adjusting the size and model of the main pipe laminating track 1 and the spoiler 2, it is suitable for main pipes M with different diameters. The main pipe laminating track 1 and the spoiler 2 are made of corrosion-resistant and high-strength materials to ensure long-term stability and durability. In addition, the rubber sealing layer 21 is pasted on the main pipe laminating plate 22 using non-toxic, non-corrosive, and highly adhesive glue.

[0089] The maximum height of the anti-backflow plate 24 and the inclination angle of the spoiler 23 are optimized according to the applicable conditions. The spoiler 2 suitable for daily water supply conditions meets the following requirements:

[0090] H≥0.74D·Re -0.2 ①

[0091] Wherein, H is the maximum height of the anti-backflow plate 24, D is the nominal diameter of the main pipe M, and Re is the Reynolds number.

[0092] The spoiler 2 suitable for pipeline cleaning meets the following requirements:

[0093] H<0.74D·Re -0.2 ②

[0094] In this embodiment, if Figure 2 and Figure 3 As shown, a main pipe fitting track 1 of a suitable type is pasted on the pipe wall of the main pipe M.

[0095] The main pipe fitting track 1 is adhered to the pipe wall of the main pipe M by using non-toxic, non-corrosive and highly adhesive glue.

[0096] In this embodiment, if Figure 2 As shown, under the condition of daily water supply, the spoiler 2 suitable for daily water supply is installed at the connection between the blind end D and the main pipe M through the main pipe fitting track 1.

[0097] Specifically, H = 1.48D·Re -0.2 The inclination angle of the spoiler 23 is 30°, so as to achieve the best effect of preventing the pollutants P inside the blind end M from diffusing to the main pipe M.

[0098] The protrusion of the main pipe fitting plate 22 is slid along the groove of the main pipe fitting track 1, so that the spoiler 2 is fixed on the pipe wall of the main pipe M at the connection between the blind end D where the incoming flow of the main pipe M first reaches and the main pipe M. The anti-backflow plate 24 is aligned with the tangent of the pipe wall of the blind end D, which can maximize the impact on the incoming flow of the main pipe M and reduce the diffusion of pollutants P inside the blind end D to the main pipe M.

[0099] In this embodiment, if Figure 2As shown, under daily water supply conditions, when the incoming flow of the main pipe M passes through the spoiler 2, the cross-sectional area of ​​the main pipe M is reduced, so that the instantaneous flow velocity of the fluid downstream of the main pipe M increases, the rotation intensity of the vortex inside the blind end D decreases, and the mixing effect of the pollutant P and the fluid is weakened. A counterclockwise vortex R is formed at the connection between the blind end D and the main pipe M after the spoiler 2, so that the fluid flowing from the inside of the blind end D to the main pipe M flows back to the inside of the blind end D, effectively controlling the diffusion of the pollutant P inside the blind end D to the main pipe M, and reducing the risk of deterioration of the drinking water quality in the water supply network.

[0100] In this embodiment, if Figure 3 As shown, in the case of pipeline cleaning, the spoiler 2 suitable for daily water supply is removed, and the spoiler 2 suitable for pipeline cleaning is installed at the connection between the blind end and the main pipe through the main pipe fitting track 1.

[0101] Specifically, H = 0.22D·Re -0.2 The inclination angle of the spoiler 23 is 45° to achieve the best pipeline cleaning efficiency improvement effect.

[0102] Specifically, the protrusion of the main pipe fitting plate 22 is slid along the groove of the main pipe fitting track 1, so that the spoiler 2 is fixed on the pipe wall of the main pipe M at the connection between the blind end D where the main pipe incoming flow first reaches and the main pipe M, and the anti-backflow plate 24 is aligned with the tangent of the pipe wall of the blind end D, which can maximize the impact on the incoming flow of the main pipe M and improve the pipeline cleaning efficiency.

[0103] In this embodiment, if Figure 3 As shown, in the case of pipeline cleaning, the counterclockwise vortex R formed at the connection between the blind end D and the main pipe M after the spoiler 2 makes the fluid flowing from the inside of the blind end D to the main pipe M more exposed outside the blind end D, and more pollutants P inside the blind end D are carried away by the incoming flow of the main pipe M, effectively improving the efficiency of pipeline cleaning.

[0104] In this embodiment, if Figure 2 As shown, after the pipeline cleaning is completed, the spoiler 2 suitable for pipeline cleaning is removed, and the spoiler 2 suitable for daily water supply is reinstalled.

[0105] In this embodiment, the blind-end pollution control device has the advantages of low cost, easy installation and replacement, simple maintenance, etc., and the local head loss caused by installing the blind-end pollution control device is almost negligible compared with the head loss along the main pipe M.

[0106] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A blind-end pollutant control device, characterized in that: It comprises a main pipe fitting track (1) and a spoiler (2). The main pipe fitting track (1) is installed on the main pipe (M) along the length direction of the main pipe, and the installation position of the main pipe fitting track (1) is close to the pipe mouth of the blind end (D). The spoiler (2) is first slidably installed on the main pipe fitting track (1), and a water flow passage is left between the spoiler (2) and the main pipe (M); The spoiler (2) comprises a sealing layer (21), a main pipe bonding plate (22), a spoiler (23) and an anti-backflow plate (24); the sealing layer (21), the main pipe bonding plate (22), the anti-backflow plate (24) and the spoiler (23) are sequentially connected from top to bottom to form a closed three-dimensional structure; the outer circumferential surface of the main pipe bonding track (1) and the inner wall of the main pipe (M) are sealed and bonded via the sealing layer (21); and the lower part of the main pipe bonding track (1) and the closed three-dimensional structure after the final fixed position is determined are sealed and bonded via the sealing layer (21).

2. A blind-end pollution control device according to claim 1, characterized in that: A long strip groove is provided at the lower part of the main pipe fitting the track (1).

3. A blind-end pollution control device according to claim 2, characterized in that: The upper part of the main pipe bonding plate (22) is provided with a protrusion, and the protrusion is slidably connected with the groove, and the lower part of the main pipe bonding plate (22) is an arc-shaped plate strip.

4. A blind-end pollution control device according to claim 3, characterized in that: The longitudinal cross-section of the closed three-dimensional structure is a right-angled triangle, and the upper end surface of the backflow prevention plate (24) is fixedly connected to the arc-shaped strip.

5. A blind-end pollution control device according to claim 4, characterized in that: The spoiler (23) is a long strip plate and is installed on the lower edge of the main pipe bonding plate (22) and the anti-backflow plate (24), and the inclined surface of the spoiler (23) faces the incoming flow direction.

6. A blind-end pollution control device according to claim 5, characterized in that: The inclination angle of the spoiler (23) is: (1) Daily water supply: H≥0.74D·Re -0.2 ① (2) When cleaning the pipeline: H<0.74D·Re -0.2 ② Wherein, H is the maximum height of the anti-backflow plate 24, D is the nominal diameter of the main pipe, and Re is the Reynolds number.

7. A blind-end pollution control device according to claim 6, characterized in that: In the case of daily water supply, H = 1.48D·Re -0.2 The inclination angle of the spoiler (23) is 30°.

8. A blind-end pollution control device according to claim 6, characterized in that: When the pipeline is cleaned, H = 0.22D·Re -0.2 The inclination angle of the spoiler (23) is 45°.

9. A method for controlling blind-end pollutants, characterized in that: The device comprises a blind-end pollutant control device according to any one of claims 1 to 8, and the blind-end pollutant control method thereof comprises the following steps: Step 1: Paste the main pipe fitting track (1) of the appropriate model onto the wall of the main pipe (M); Step 2: Install the spoiler (2) on the main pipe fitting track (1); Step 21: When the use environment is under daily water supply conditions: The spoiler (2) suitable for daily water supply is installed at the connection between the blind end and the main pipe (M) through the main pipe fitting track (1); Step 22: When the use environment is pipeline cleaning: Remove the spoiler (2) suitable for daily water supply, and install the spoiler (2) suitable for pipeline cleaning at the connection between the blind end and the main pipe (M) through the main pipe fitting track (1); Step 23: After the pipeline cleaning is completed, remove the spoiler (2) suitable for pipeline cleaning and reinstall the spoiler (2) suitable for daily water supply. At this point, by replacing different spoilers (2), it is possible to achieve daily control of the release of blind-end pollutants and promote the discharge of blind-end pollutants to achieve cleaning.

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