A blind end contaminant control device and blind end contaminant control method

Abstract

The application discloses a blind-end pollutant control device and a blind-end pollutant control method, and relates to the field of water quality keeping.The application solves the problems of the existing spoiler, i.e., the spoiler cannot be applied to blind-end branch pipe pollutant control in different use environments due to a fixed installation position, and low efficiency of cleaning blind-end pollutants.In daily water supply, the spoiler suitable for daily water supply is installed at the connection between a blind end and a dry pipe through a dry pipe fitting track.In pipe cleaning, the spoiler suitable for daily water supply is removed, and the spoiler suitable for pipe cleaning is installed at the connection between the blind end and the dry pipe through the dry pipe fitting track.After the pipe cleaning is completed, the spoiler suitable for pipe cleaning is removed, and the spoiler suitable for daily water supply is reinstalled.The application is used for blind-end pollutant control.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water supply water quality maintenance, in particular to a blind end pollutant control device and a blind end pollutant control method for controlling and cleaning the pollutants of the blind end of the water supply pipe network pipeline. BACKGROUND

[0002] With the acceleration of urbanization, as an important part of urban infrastructure, the safe and stable operation of the water supply pipe network is directly related to the daily life and production activities of urban residents. At the branch of the water supply pipe network, due to slow water flow and long water age, it is easy to become a region where pollutants are retained and water quality deteriorates, thereby affecting the water quality safety of the entire water supply system, i.e. 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 the blind end to some extent, but these methods have low efficiency, high energy consumption, high cost, long water stop time and other disadvantages, and the risk of physical damage to the pipe network and secondary pollution of water quality cannot be ignored.

[0004] In recent years, in order to more economically and effectively control the spread of pollutants in the blind end, researchers have begun to explore physical methods based on fluid mechanics principles, such as installing a flow disrupter in the blind end to change the water flow state and thereby control the spread of pollutants. For example: the master's degree thesis of Harbin Institute of Technology in 2023 discloses "Research on the influence of flow disrupter on the spread of pollutants in the blind end of water supply pipe network", which mainly gives a theoretical flow disrupter, which is composed of a right triangle block and an "L" shaped plate body, wherein the "L" shaped plate body is connected with the dry flow pipeline, and one right angle side of the right triangle block is installed on the "L" shaped plate body, and the hypotenuse of the right triangle block faces the dry pipe flow direction.

[0005] The flow disrupter creates a cavity structure in the turbulent flow, which weakens the mixing characteristics between the blind end branch and the dry pipe, so the shear layer of the incoming flow crosses the cavity and does not directly impact the fluid inside the blind end branch. By adjusting the angle between the hypotenuse of the right triangle block and the incoming flow, the degree of flow disturbance to the blind end pollutants is adjusted to prevent the release of pollutants or reduce the spread of pollutants to the dry pipe. However, due to the fixed installation position, it is not convenient to disassemble, which leads to the problem that it cannot adjust the degree of flow disturbance to the blind end branch for different use periods, different diameters and different pollution conditions, resulting in low efficiency in cleaning the pollutants in the blind end.

[0006] In summary, the existing flow disrupter has the problems of low efficiency in cleaning the pollutants in the blind end and being unable to control the pollutants in the blind end of the branch pipe in different use environments due to the fixed installation position and inconvenience in disassembly. SUMMARY

[0007] The technical scheme of the present application is: The present application provides a blind end pollution control device and a blind end pollution control method to effectively control the diffusion of blind end internal pollutants to the main pipe and the low efficiency of cleaning the blind end pollutants.

[0008] The technical scheme of the present application is:

[0009] A blind end pollution 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 opening of the blind end, the spoiler is slidingly installed on the main pipe fitting track, and a water flow passage is left between the spoiler and the main pipe; the spoiler comprises a sealing layer, a main pipe fitting plate, a spoiler plate and an anti-backflow plate, the sealing layer, the main pipe fitting plate, the anti-backflow plate and the spoiler plate are connected in sequence from top to bottom and form a closed three-dimensional structure, the outer circumferential surface of the main pipe fitting track is sealingly bonded to the inner wall of the main pipe through the sealing layer, and the lower part of the main pipe fitting track is sealingly bonded to the closed three-dimensional structure after the final fixed position is determined.

[0010] Further, a long strip-shaped groove is formed in the lower part of the main pipe fitting track.

[0011] Preferably, the upper part of the main pipe fitting plate is provided with a protrusion, the protrusion is slidingly connected between the groove, and the lower part of the main pipe fitting plate is a circular arc-shaped plate strip.

[0012] Preferably, the longitudinal section shape of the closed three-dimensional structure is a right-angled triangle, and the upper end surface of the anti-backflow plate is fixedly connected to the circular arc-shaped plate strip.

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

[0014] Further, the height of the anti-backflow plate is:

[0015] (1) When the daily water supply condition is:

[0016] ①

[0017] (2) When the pipeline cleaning condition is:

[0018] ②

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

[0020] Preferably, when the daily water supply condition is, The inclination angle of the spoiler is 30°.

[0021] Preferably, in the case of pipeline cleaning, The inclination angle of the spoiler is 45°.

[0022] The application also provides a blind end pollution control method, which comprises a blind end pollution control device, and the blind end pollution control method comprises the following steps:

[0023] Step one: paste a dry pipe fitting track of a suitable model on the pipe wall of the dry pipe;

[0024] Step two: install a spoiler on the dry pipe fitting track;

[0025] Step two one: when the use environment is a daily water supply case, the inclination angle of the spoiler is 30°.

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

[0027] Step two two: when the use environment is a pipeline cleaning case, the inclination angle of the spoiler is 45°.

[0028] Remove the spoiler suitable for the daily water supply case, and install the spoiler suitable for the pipeline cleaning case on the connection between the blind end and the dry pipe through the dry pipe fitting track;

[0029] Step two three: after the pipeline cleaning is completed, remove the spoiler suitable for the pipeline cleaning case, and reinstall the spoiler suitable for the daily water supply case, so that different spoilers are replaced to control the release of blind end pollution and promote the discharge of blind end pollution, and cleaning is realized.

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

[0031] 1. Taking the daily water supply case as an example, at this time, the inclination angle of the spoiler plate 23 of the spoiler is 30°, and the height of the anti-backflow plate 24 is relatively large (compared between the daily water supply case and the pipeline cleaning case), when the dry pipe flow passes through the spoiler, the cross-sectional area of the dry pipe is reduced, the instantaneous flow rate of the downstream fluid of the dry pipe is increased, the rotation intensity of the vortex inside the blind end is reduced, the mixing effect of the pollution and the fluid is weakened, the clockwise vortex is formed at the connection between the blind end and the dry pipe after the spoiler, the fluid flowing from the inside of the blind end to the dry pipe flows back to the inside of the blind end, the diffusion of the blind end pollution to the dry pipe is effectively controlled, and the risk of deterioration of the drinking water quality in the water supply network is reduced.

[0032] 2. Taking pipeline cleaning as an example, at this time, the tilt angle of the baffle plate 23 of the baffle is 45°, and the height of the anti-backflow plate 24 is relatively small. The counterclockwise vortex formed at the connection between the blind end and the main pipe after the baffle makes more of the fluid flowing from the inside of the blind end to the main pipe exposed outside the blind end. 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. This invention provides selection methods for the tilt angle of the baffle 23 and the height of the anti-backflow plate 24 under both daily water supply and pipeline cleaning conditions. This is equivalent to providing different tilt angle and height parameters for various operating environments, thus offering multiple models of baffles suitable for controlling contamination in blind-end branch pipes under different conditions. It is applicable not only to daily water supply but also to pipeline cleaning.

[0034] 4. The main pipe, the main pipe fitting track 1, and the flow disruptor 2 of this invention are connected by adhesive bonding, which is low-cost, easier to disassemble, and simple to maintain. The local head loss caused by the installation of the blind-end pollutant control device is almost negligible compared to the head loss along the main pipe.

[0035] 5. When cleaning blind ends, this invention promotes the discharge of pollutants by determining the parameters of the baffle 23 and the anti-backflow plate 24, thereby improving the efficiency of cleaning pollutants at blind ends. Furthermore, this invention overcomes the limitation that the height of the anti-backflow plate 24 must be higher than the boundary layer thickness (the viscosity of drinking water flowing in water supply pipes is relatively low; when it flows through the pipe, the effect of viscosity is limited to a thin layer close to the pipe wall, and outside this thin layer, the effect of viscosity can be ignored. Within this thin layer, each surface forms a velocity gradient region from zero velocity at the pipe wall surface to the outward flow velocity; this thin layer is called the boundary layer). It also overcomes the difficulty in clearly observing changes in the flow field near the baffle when the height of the anti-backflow plate 24 is too small. Within the range where the height of the anti-backflow plate 24 is less than the boundary layer, the baffle's promoting effect on the diffusion of pollutants in the blind end was discovered. Continuing with the goal of improving pipe cleaning efficiency, the two key parameters of the baffle—the tilt angle of the baffle and the height of the anti-backflow plate—were optimized. Attached Figure Description

[0036] Fig. 1 This is a schematic diagram of the structure of the blind-end pollutant control device according to an embodiment of the present invention;

[0037] Fig. 2 This is a schematic diagram of the blind-end pollutant control device of this invention installed in the pipeline under normal water supply conditions;

[0038] Fig. 3 This is a schematic diagram of the blind-end pollutant control device of the present invention installed inside the pipeline during pipeline cleaning.

[0039] BRIEF DESCRIPTION OF DRAWINGS

[0040] 1. Dry pipe fitting rail; 2. Spoiler; 21. Sealing layer; 22. Dry pipe fitting plate; 23. Spoiler plate; 24. Anti-backflow plate; R. Counterclockwise vortex; P. Pollutant. DETAILED DESCRIPTION

[0041] DETAILED DESCRIPTION Figs. 1-3 In this embodiment, the dry pipe fitting rail 1 is installed on the dry pipe along the length direction of the dry pipe, and the installation position of the dry pipe fitting rail 1 is close to the pipe opening of the blind end. The spoiler 2 is slidingly installed on the dry pipe fitting rail 1, and a water flow passage is left between the spoiler 2 and the dry pipe. The spoiler 2 includes a sealing layer 21, a dry pipe fitting plate 22, a spoiler plate 23, and an anti-backflow plate 24. The sealing layer 21, the dry pipe fitting plate 22, the anti-backflow plate 24, and the spoiler plate 23 are connected in sequence from top to bottom and form a closed three-dimensional structure. The outer circumferential surface of the dry pipe fitting rail 1 and the inner side wall of the dry pipe are sealed and bonded by the sealing layer 21. The lower part of the dry pipe fitting rail 1 and the closed three-dimensional structure after the final fixed position are sealed and bonded by the sealing layer 21.

[0042] In this embodiment, the blind end pollutant control device is proposed in the closed three-dimensional structure formed by the sealing layer 21, the dry pipe fitting plate 22, the anti-backflow plate 24, and the spoiler plate 23. There is no excess plate body at the connection. The rubber sealing layer is pasted on the side of the dry pipe fitting plate in contact with the dry pipe fitting rail, so that there is no gap between the dry pipe fitting plate and the dry pipe fitting rail. The spoiler plate and the dry pipe fitting plate form a certain angle, so that the spoiler plate can change the flow path of the dry pipe incoming flow, form a cavity structure at the connection between the blind end and the dry pipe, and pass through the incoming flow.

[0043] The anti-backflow plate of this embodiment is a planar structure perpendicular to the pipe wall, which can be connected with the dry pipe fitting plate 22 and the spoiler plate 23 without leaving excess plate bodies, and can prevent the dry pipe incoming flow after reaching the spoiler from flowing back to the spoiler before, avoiding further accumulation and spread of pollutants in the dry pipe.

[0044] The blind end pollutant control device in this embodiment is made of corrosion-resistant and high-strength materials to ensure the stability and durability of long-term operation.

[0045] The sealing layer 21 in the embodiment is used to paste the dry pipe fitting track on the dry pipe wall and paste the rubber sealing layer on the dry pipe fitting plate by using non-toxic, non-corrosive and strong adhesive. When the user uses the water in the dry pipe, the human body will not be harmed, and the connection of the spoiler 2 can be more firm to prevent it from being washed away by the shear force generated by the water flow in the water supply pipeline. Many leak repair methods also use adhesion.

[0046] The installation mode of the spoiler 2 is that the protrusions of the dry pipe fitting plate 22 are slid along the grooves of the dry pipe fitting track 1, so that the spoiler 2 is fixed on the dry pipe wall at the connection between the blind end where the dry pipe coming flow first reaches and the dry pipe, and the anti-backflow plate 24 is aligned with the tangent of the blind end wall. The sliding installation mode of the dry pipe fitting plate 22 and the dry pipe fitting track 1 can realize the free mounting and dismounting of different models of the spoiler 2 to meet different needs of reducing the diffusion of internal pollutants in the blind end to the dry pipe or improving the pipeline cleaning efficiency in actual operation conditions.

[0047] Specific implementation method two: combined with Figs. 1-3 In this embodiment, the lower part of the dry pipe fitting track 1 is provided with a long groove. In this way, the upper part of the dry pipe fitting plate 22 is provided with a protrusion for cooperation, so as to realize the sliding connection between the spoiler 2 and the dry 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 dry pipe fitting track 1. During the selection of the use position, after the specific position is determined, the dry pipe fitting plate 22 and the dry pipe fitting track 1 are fixed by the sealing layer. The other components and the embodiment are the same as those in the specific implementation method one.

[0048] Specific implementation method three: combined with Fig. 1 In this embodiment, the upper part of the dry pipe fitting plate 22 is provided with a protrusion, and the lower part of the dry pipe fitting plate 22 is a circular arc strip.

[0049] In this way, the dry pipe fitting track is provided with a groove, and the dry pipe fitting plate is provided with a protrusion. The protrusion of the dry pipe fitting plate can slide along the groove of the dry pipe fitting track, so that the spoiler is fixed at a specific position. The other components and connection relationships are the same as those in the specific implementation method one or two.

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

[0051] Specific implementation four: combination Figs. 2-3 In this embodiment, the longitudinal section shape of the spoiler 2 is a right triangle, and the upper end surface of the anti-backflow plate 24 is fixedly connected with the circular-arc-shaped plate strip.

[0052] In this way, the incoming flow is reduced, the flow-through area in front of the blind end is reduced, and the reliability of the spoiler connection is ensured. The other components and connection relationships are the same as any one of the specific implementations one to three.

[0053] Specific implementation five: combination Figs. 2-3 In this embodiment, the spoiler plate 23 is a long strip-shaped plate and is installed on the lower edge of the dry pipe fitting plate 22 and the anti-backflow plate 24, and the inclined surface of the spoiler plate 23 faces the incoming flow direction.

[0054] In this way, the spoiler plate 23 can play a spoiler effect on the incoming flow. The other components and connection relationships are the same as any one of the specific implementations one to four.

[0055] When the spoiler is not installed, in daily situations, the pollutants inside the blind end are affected by the dry pipe incoming flow, a large amount of which enters the dry pipe, causing secondary pollution of the water quality; in the pipe cleaning working condition, the diffusion rate of the pollutants inside the blind end into the dry pipe is difficult to achieve the purpose of completely cleaning the blind end in a short time. Therefore, the spoiler needs to be installed at the connection between the dry pipe and the blind end to change the original water flow streamline, so as to prevent the diffusion of pollutants inside the blind end or improve the pipe cleaning efficiency.

[0056] After the spoiler is installed, the spoiler lifts the boundary layer of the dry pipe incoming flow, and flow separation occurs after the spoiler, forming a cavity structure. Different parameters of the spoiler form different characteristics of the cavity structure: when the inclination angle of the spoiler plate 23 of the spoiler is 30° and the height of the anti-backflow plate 24 is relatively large (compared between daily water supply and pipe cleaning), when the dry pipe incoming flow passes through the spoiler, the cross-sectional area of the dry pipe is reduced, the instantaneous flow velocity of the downstream of the dry pipe is increased, the rotation intensity of the vortex inside the blind end is reduced, the mixing effect of the pollutants and the fluid is weakened, and a counterclockwise vortex is formed at the connection between the blind end and the dry pipe after the spoiler, so that the fluid flowing from the inside of the blind end to the dry pipe flows back to the inside of the blind end, effectively controlling the diffusion of the pollutants inside the blind end to the dry pipe and reducing the risk of deterioration of the drinking water quality in the water supply network; when the inclination angle of the spoiler plate 23 of the spoiler is 45° and the height of the anti-backflow plate 24 is relatively small, the counterclockwise vortex formed at the connection between the blind end and the dry pipe after the spoiler makes the fluid flowing from the inside of the blind end to the dry pipe more exposed outside the blind end, and more pollutants inside the blind end are taken away by the dry pipe incoming flow, effectively improving the efficiency of pipe cleaning.

[0057] Specific implementation six: combination Figs. 1-3To illustrate the present embodiment, the height of the backflow prevention plate 24 in the present embodiment is:

[0058] (1) In the case of daily water supply:

[0059] ①

[0060] (2) In the case of pipeline cleaning:

[0061] ②

[0062] wherein H is the height of the backflow prevention plate 24, D is the nominal diameter of the dry pipe, and Re is the Reynolds number.

[0063] In this way, by limiting the selection principle of the size parameters of the spoiler, a series of models of the dry pipe fitting track and the spoiler are designed to be suitable for water supply pipelines of different diameters. The other components and connection relationships are the same as any one of the first to fifth embodiments.

[0064] The present embodiment designs a series of models of the dry pipe fitting track 1 and the spoiler 2 to be suitable for water supply pipelines of different diameters, and to meet different needs of reducing the diffusion of internal pollutants in the blind end to the dry pipe or improving the pipeline cleaning efficiency in actual operation conditions.

[0065] The height of the backflow prevention plate 24 and the inclination angle of the spoiler plate 23 are optimized according to different application conditions. The application conditions for optimization include two kinds, the first kind is to reduce the diffusion of internal pollutants in the blind end to the dry pipe, and the second kind is to improve the pipeline cleaning efficiency.

[0066] When the spoiler is not installed, in the daily situation, the internal pollutants in the blind end will be affected by the dry pipe inflow, and a large amount of them will enter the dry pipe, causing secondary pollution of water quality; in the pipeline cleaning condition, the diffusion rate of internal pollutants in the blind end to the dry pipe is difficult to achieve the purpose of completely cleaning the blind end in a short time. Therefore, the spoiler is installed at the connection between the dry pipe and the blind end to change the original water flow streamline, so as to achieve the purpose of preventing the diffusion of internal pollutants in the blind end or improving the pipeline cleaning efficiency.

[0067] After the installation of the spoiler, the spoiler lifts the boundary layer of the dry pipe flow, and flow separation occurs behind the spoiler, forming a cavity structure. Different parameters of the spoiler form different characteristics of the cavity structure: when the spoiler plate 23 of the spoiler has an inclination angle of 30°, the height of the anti-backflow plate 24 is relatively large (compared between the daily water supply situation and the pipe cleaning situation), when the dry pipe flow passes through the spoiler, the cross-sectional area of the dry pipe decreases, the instantaneous flow velocity of the downstream fluid of the dry pipe increases, the rotation intensity of the vortex inside the blind end decreases, the mixing effect of the pollutants and the fluid is weakened, and the clockwise vortex is formed at the connection between the blind end and the dry pipe behind the spoiler. The fluid flowing from the inside of the blind end to the dry pipe flows back to the inside of the blind end, effectively controls the diffusion of pollutants inside the blind end to the dry pipe, and reduces the risk of deterioration of the drinking water quality in the water supply network; when the inclination angle of the spoiler plate 23 of the spoiler is 45°, the height of the anti-backflow plate 24 is relatively small, and the clockwise vortex formed at the connection between the blind end and the dry pipe behind the spoiler makes the fluid flowing from the inside of the blind end to the dry pipe more exposed outside the blind end, and more pollutants inside the blind end are carried away by the dry pipe flow, thereby effectively improving the efficiency of pipe cleaning.

[0068] For the blind end pollutants, the existing research focuses on preventing the diffusion of pollutants in the blind end to the dry pipe, which can effectively avoid secondary pollution of drinking water quality in the daily situation which occupies most of the time of pipeline operation. Therefore, the parameters of the spoiler designed in the experiment are also targeted for this purpose, and the possibility of applying the spoiler to improve the efficiency of pipe cleaning is not found.

[0069] In addition, in the existing papers, PIV is used to observe the flow field change near the spoiler. Due to the limitation of the PIV observation window, it can only observe the flow field change near the large-volume spoiler, and therefore no experiment is conducted on the small-volume spoiler.

[0070] In the development process of the present application, the height of the anti-backflow plate 24 is limited to be higher than the thickness of the boundary layer, and the difficulty of clearly observing the flow field change near the spoiler by PIV when the height of the anti-backflow plate 24 is too low is overcome. It is found that when the height of the anti-backflow plate of the spoiler is set to be lower than the boundary layer, it has a promoting effect on the diffusion of pollutants in the blind end to the dry pipe, which can promote the efficiency of pipe cleaning. Therefore, the spoiler is endowed with a new function, and the design parameters are optimized for the purpose of promoting the efficiency of pipe cleaning.

[0071] Specific implementation method seven: in combination Fig. 2 It is explained that in the daily water supply situation of the present embodiment, the inclination angle of the spoiler plate 23 is 30°.

[0072] ​So as to achieve the best effect of pollution control. Reduce the diffusion of blind end internal pollutants to the dry pipe by more than 60%. Other components and connection relationship are the same as any one of the first to the sixth embodiments.

[0073] In the daily water supply situation, when the dry pipe inflow passes through the spoiler 2, the cross-sectional area of the dry pipe is reduced, the instantaneous flow rate of the downstream fluid of the dry pipe is increased, the rotation intensity of the vortex inside the blind end is reduced, the mixing effect of the pollutants and the fluid is weakened, and the counterclockwise vortex is formed at the connection between the blind end and the dry pipe after the spoiler 2. Let the fluid flowing from the blind end inside to the dry pipe flow back to the blind end inside, effectively control the diffusion of the blind end internal pollutants to the dry pipe, and reduce the risk of deterioration of the drinking water quality in the water supply network.

[0074] Specific embodiment eight: combination Fig. 3 To illustrate this embodiment, in the pipe cleaning situation, The inclination angle of the spoiler plate 23 is 45°.

[0075] So as to achieve the best effect of improving the efficiency of pipe cleaning. Increase the diffusion of blind end internal pollutants to the dry pipe by more than 60%. Other components and connection relationship are the same as any one of the first to the seventh embodiments.

[0076] The counterclockwise vortex formed at the connection between the blind end and the dry pipe after the spoiler 2 in the pipe cleaning situation of the present application makes the fluid flowing from the blind end inside to the dry pipe more exposed outside the blind end, and more blind end internal pollutants are taken away by the dry pipe inflow, effectively improving the efficiency of pipe cleaning.

[0077] The present application has the advantages of low cost, convenient 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 dry pipe head loss along the way.

[0078] Specific embodiment nine: combination Figs. 1-3 To illustrate this embodiment, the blind end pollution control device in the first to the eighth embodiments is used, and the blind end pollution control method has the following steps:

[0079] Step one: paste the dry pipe fitting track 1 of a suitable model on the pipe wall of the dry pipe;

[0080] Step two: install the spoiler 2 on the dry pipe fitting track 1;

[0081] Step two: when the use environment is the daily water supply situation:

[0082] Install the spoiler 2 suitable for the daily water supply situation at the connection between the blind end and the dry pipe through the dry pipe fitting track 1;

[0083] Step two: when the use environment is pipeline cleaning, the following steps are taken:

[0084] The spoiler 2 for daily water supply is removed, and the spoiler 2 for pipeline cleaning is installed at the connection between the blind end and the dry pipe through the dry pipe fitting track 1.

[0085] Step three: after the pipeline cleaning is completed, the spoiler 2 for pipeline cleaning is removed, and the spoiler 2 for daily water supply is reinstalled. Thus, by replacing different spoilers 2, both the release of pollutants in the blind end and the promotion of the discharge of pollutants in the blind end can be achieved.

[0086] In combination with Figs. 1-3 The embodiment of the present application is described: the blind end generally exists at the end of the water supply pipe network, and the diameter of the dry pipe connected to the blind end is relatively small, generally about DN100. Therefore, in the embodiment, the diameter of the dry pipe and the diameter of the blind end are DN100. The inclination angle of the spoiler plate in daily use is 30°, and the inclination angle of the spoiler plate in cleaning is 45°.

[0087] The embodiment of the present application provides a blind end pollutant control device for being placed in a pipeline, which comprises a dry pipe fitting track 1 and a spoiler 2. The spoiler 2 comprises a sealing layer 21, a dry pipe fitting plate 22, a spoiler plate 23, and an anti-backflow plate 24, wherein the sealing layer 21 is a rubber sealing layer. The dry pipe fitting plate 22, the spoiler plate 23, and the anti-backflow plate 24 are connected to each other to form a closed three-dimensional structure, and there is no excess plate body at the connection. The dry pipe fitting track 1 has a groove, the dry pipe fitting plate 22 has a protrusion, and the protrusion of the dry pipe fitting plate 22 can slide along the groove of the dry pipe fitting track 1, so that the dry pipe fitting plate 22 is fixed at a specific position. The rubber sealing layer 21 is pasted on the side of the dry pipe fitting plate 22 in contact with the dry pipe fitting track 1, so that there is no gap between the dry pipe fitting plate 22 and the dry pipe fitting track 1. The spoiler plate 2 and the dry pipe fitting plate 22 form a certain angle (30-60°) to achieve lifting of the boundary layer of the dry pipe incoming flow and flow separation after the spoiler, so that the spoiler plate 23 can change the flow path of the dry pipe incoming flow and form a cavity structure at the connection between the blind end and the dry pipe. The anti-backflow plate 24 can prevent the dry pipe incoming flow after the spoiler 2 from flowing back to the front of the spoiler 2, avoiding further accumulation and diffusion of pollutants P in the dry pipe.

[0088] In addition, the size and model of the dry pipe fitting track 1 and the spoiler 2 are adjusted to be applicable to dry pipes of different diameters. The dry pipe fitting track 1 and the spoiler 2 are made of corrosion-resistant and high-strength materials to ensure the stability and durability of long-term operation. Moreover, the rubber sealing layer 21 is pasted on the dry pipe fitting plate 22 by using non-toxic, non-corrosive and strong adhesive.

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

[0090] ①

[0091] Among them, H is the height of the anti-backflow plate 24, D is the nominal diameter of the dry pipe, and Re is the Reynolds number.

[0092] The spoiler 2 applicable to pipe cleaning meets the following requirements:

[0093] ②

[0094] In this embodiment, as shown in Fig. 2 and Fig. 3 , the dry pipe fitting track 1 of a suitable model is pasted on the pipe wall of the dry pipe.

[0095] The dry pipe fitting track 1 is pasted on the pipe wall of the dry pipe by using non-toxic, non-corrosive and strong adhesive.

[0096] In this embodiment, as shown in Fig. 2 , under the condition of daily water supply, the spoiler 2 applicable to daily water supply is installed at the connection between the blind end and the dry pipe through the dry pipe fitting track 1.

[0097] Specifically, , the inclination angle of the spoiler plate 23 is 30° to achieve the best effect of preventing the pollutants P inside the blind end from diffusing to the dry pipe.

[0098] The protrusions of the dry pipe fitting plate 22 are slid along the grooves of the dry pipe fitting track 1, so that the spoiler 2 is fixed on the pipe wall of the dry pipe at the connection between the blind end and the dry pipe where the incoming flow of the dry pipe first arrives. The anti-backflow plate 24 is aligned with the tangent of the pipe wall of the blind end, which can maximize the influence on the incoming flow of the dry pipe and reduce the diffusion of the pollutants P inside the blind end to the dry pipe.

[0099] In this embodiment, as shown in Fig. 2As shown, in the daily water supply situation, when the inflow of the main pipe passes through the spoiler 2, the cross-sectional area of the main pipe is reduced, the instantaneous flow rate of the fluid downstream of the main pipe is increased, the rotation intensity of the vortex inside the blind end is reduced, the mixing effect of the pollutants P and the fluid is weakened, and the clockwise vortex R is formed at the connection between the blind end and the main pipe after the spoiler 2. The fluid flowing from the inside of the blind end to the main pipe flows back to the inside of the blind end, effectively controls the diffusion of the pollutants P in the blind end to the main pipe, and reduces the risk of deterioration of the quality of drinking water in the water supply network.

[0100] In this embodiment, as shown in the daily water supply situation, the spoiler 2 suitable for the daily water supply situation is removed, and the spoiler 2 suitable for the pipeline cleaning situation is installed on the blind end and the main pipe through the main pipe fitting track 1. Fig. 3

[0101] Specifically, , the inclination angle of the spoiler plate 23 is 45°, so as to achieve the best pipeline cleaning efficiency improvement effect.

[0102] Specifically, the protrusions of the main pipe fitting plate 22 are slid along the grooves of the main pipe fitting track 1, so that the spoiler 2 is fixed on the pipe wall of the main pipe at the connection between the blind end and the main pipe where the inflow of the main pipe first reaches, and the anti-backflow plate 24 is aligned with the tangent of the pipe wall of the blind end. The inflow of the main pipe can be affected to the greatest extent, and the pipeline cleaning efficiency is improved.

[0103] In this embodiment, as shown in the daily water supply situation, the spoiler 2 suitable for the daily water supply situation is removed, and the spoiler 2 suitable for the pipeline cleaning situation is installed on the blind end and the main pipe through the main pipe fitting track 1. Fig. 3

[0104] In this embodiment, as shown in the daily water supply situation, the spoiler 2 suitable for the daily water supply situation is removed, and the spoiler 2 suitable for the pipeline cleaning situation is installed on the blind end and the main pipe through the main pipe fitting track 1. Fig. 2

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

[0106] ​​​The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A blind-end pollutant control device, characterized in that: It includes a main pipe fitting track (1) and a flow disruptor (2). The main pipe fitting track (1) is installed on the main pipe along the length of the main pipe, and the installation position of the main pipe fitting track (1) is close to the pipe opening at the blind end. The flow disruptor (2) is slidably installed on the main pipe fitting track (1), and a water flow passage is left between the flow disruptor (2) and the main pipe. The spoiler (2) includes 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 connected from top to bottom to form a closed three-dimensional structure. The outer circumferential surface of the main pipe bonding track (1) is sealed and bonded to the inner wall of the main pipe through the sealing layer (21). The lower part of the main pipe bonding track (1) is sealed and bonded to the closed three-dimensional structure after the final fixed position is determined through the sealing layer (21). The baffle (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 slope of the baffle (23) faces the direction of the incoming flow; during normal water supply, the tilt angle of the baffle (23) is 30°; during pipe cleaning, the tilt angle of the baffle (23) is 45°. The height of the anti-backflow baffle (24) is: (1) Under normal water supply conditions: ① (2) During pipeline cleaning: ② Wherein, H is the height of the anti-backflow plate (24), D is the nominal diameter of the main pipe, and Re is the Reynolds number.

2. The blind-end pollutant control device according to claim 1, characterized in that: The lower part of the main pipe fitting track (1) has a long groove.

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

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

5. The blind-end pollutant control device according to claim 4, characterized in that: During normal water supply, .

6. The blind-end pollutant control device according to claim 5, characterized in that: During pipe cleaning, .

7. A method for controlling blind-end pollutants, characterized in that: It includes a blind-end pollutant control device according to any one of claims 1-6, wherein the blind-end pollutant control method comprises the following steps: Step 1: Attach the appropriate type of main pipe to the track (1) and stick it to the wall of the main pipe; Step 2: Install the spoiler (2) on the main pipe fitting track (1); Step 21: When the usage environment is under normal water supply conditions: The turbulence diffuser (2) suitable for daily water supply is installed at the connection between the blind end and the main pipe via the main pipe fitting track (1); Step 22: When the usage environment is pipe cleaning: Remove the baffle (2) suitable for daily water supply and install the baffle (2) suitable for pipe cleaning at the connection between the blind end and the main pipe via the main pipe fitting track (1). Steps 2 and 3: After the pipeline cleaning is completed, remove the baffle (2) suitable for pipeline cleaning and reinstall the baffle (2) suitable for daily water supply. Thus, by replacing different baffles (2), it is possible to both control the release of pollutants at the blind end in daily operation and promote the discharge of pollutants at the blind end, thereby achieving cleaning.

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