JP4293096B2 - In-pipe turbidity removal device - Google Patents

Description

  The present invention relates to an improvement in an in-pipe turbidity removing device that draws running water from a distribution pipe such as tap water or industrial water, removes turbidity contained in the running water, and returns separated water to the distribution pipe.

  When repairing or replacing the water pipe, or due to aging of the pipe, turbidity such as sand particles, rust, and paint fragments enter the water pipe. As a conventional method for removing the turbidity contained in the running water of the water distribution pipe, a washing pipe operation in which a hose or the like is attached to a fire hydrant of the water distribution pipe and the turbidity is discharged together with the discharge of tap water or the like is the mainstream. In this case, unless the flow rate of the hose attached to the fire hydrant is high, it is difficult to discharge turbidity in the pipe, and a large amount of tap water is required. This is a problem from the effective use of water, and the working time becomes longer as the number of cleaning points increases.

  As a method similar to this washing pipe work, a T-shaped branch pipe is installed in the water distribution pipe buried in the ground, the flow path of the water distribution pipe is shut off with a valve, and the suspended matter in the running water is moved to the fire hydrant side. A T-tube for a fire hydrant with a valve to be discharged is also known as described in Patent Document 1. In addition, as an embedded strainer attached to an existing water distribution pipe or the like, a rotatable filter member is disposed in a sealed case having an inlet and an outlet, and a suction pipe close to the filter member is opened to the atmosphere. A turbidity removal device that discharges the trapped turbidity is also known as described in Patent Document 2. As a method for reducing washing waste water as much as possible, a foreign matter collecting device for disposing a foreign matter collecting device placed on a moving vehicle in a bypass line connected between a pair of fire hydrants is also disclosed in Patent Document 3. It is well known as described.

JP 2002-161559 (paragraph number 0008 and paragraph number 0009, FIG. 1A) Japanese Patent Laid-Open No. 10-286409 (Claim 1, FIG. 7) JP-A-7-303868 (Claim 1, FIG. 1)

  Sand and rust with a particle size of approximately 0.1 to 4.8 mm contained in the water flow of the water distribution pipe begin to flow at the bottom of the pipe when the flow velocity is 0.4 m / sec or more, and flow from the bottom to the center of the pipe. It has been elucidated. In the conventional method of discharging turbidity from the fire hydrant, local turbulence occurs near the inside of the branch of the water distribution pipe, and a lot of material moves on the turbulent flow. The discharge effect of rust and rust is poor, and the foreign matter cannot be removed unless a large amount of water is drained, and the function of the foreign matter discharge facility cannot be sufficiently fulfilled. Moreover, if the flow of running water in the distribution pipe is fast, turbidity does not flow into the fire hydrant.

  Although the conventional T-tube for a fire hydrant with a valve can effectively remove turbidity, the water flow is directed only in the direction of the fire hydrant due to the movement of the valve body. If a T-tube for a fire hydrant with a valve is installed in a place where turbidity removal is required, the amount of cleaning wastewater discharged from the water distribution pipe becomes large, and the cost for installation increases. The buried strainer attached to an existing water distribution pipe, etc. has the advantage that the turbidity collected by the metal filter is discharged by the difference between the water distribution pipe and the atmospheric pressure, so it can be removed well. When a large amount of fine particles flow into the filter, the filter captures the fine particles below the mesh width and becomes cake filtration. If the pressure loss increases, the metal filter cannot be cleaned unless the fluid pipe is cut off. Manual cleaning requires manpower, and automation requires electrical equipment and the like. In addition, it is not preferable to put a strainer, which is a resistor, into the running water because the water flow resistance increases. The device for collecting foreign matter in pipelines placed on a moving vehicle does not need a special fixed structure, but a water shutoff point occurs because a pair of fire hydrants are connected by a bypass pipe and the water pipe between them is closed. . The length of the hose between the fire hydrants is required, and it becomes complicated such as placing it on the road. The present invention provides an in-pipe turbidity removal device that is simple to construct and maintain on site and has a small installation space.

  The gist of the present invention is that in the turbidity recovery device that extracts the running water from the water distribution pipe with a water absorption pump and separates the turbidity contained in the running water and returns the separated water to the water distribution pipe, the water is sucked into the upstream side of the running water. A branch pipe that discharges to the downstream side and forms a flow path is suspended from the water distribution pipe, and the suction flow path and discharge flow path of the branch pipe are connected to the circulation pipe. The turbidity is separated by the turbidity removal unit, and the separated water is ejected from the discharge flow path of the branch pipe to the running water of the water distribution pipe. The turbidity can be floated and fluidized by reaching the bottom, and the suspended turbidity can flow into the circulation pipe by the drawing flow of the water absorption pump to separate the turbidity from the flowing water. And the separated water of a high-speed flow becomes a perpendicular | vertical and curtain shape with respect to the flowing water of a distribution pipe, and the outflow to the downstream of a suspended matter is prevented. Not only the turbidity moving on the bottom of the water distribution pipe but also the entire pipe can be targeted for turbidity removal. Since no equipment is provided inside the distribution pipe, water resistance is low and there is no risk of water breakage by the equipment.

  The branch pipe that hangs down to the water pipe may use a fire hydrant. The pipe unit is detachably connected to the fire hydrant attached to the water pipe, and the connection port of the fire hose is provided in the pipe unit. A drawing flow connection port and a return flow connection port are connected to the circulation pipe, and the discharge pipe connected to the return flow connection port of the piping unit is suspended by a fire hydrant and discharged near the upper wall of the water distribution pipe. If the piping unit is connected to the water hydrant of the watershed in the basin where mixing of sand and rust peeling is expected, it is temporarily installed near the target water distribution pipe. Therefore, it is not necessary to fix the turbidity removal device in the pipe. There is no need to install a special fixed structure, and the construction and maintenance on site is simple and the turbidity removal device in the pipe is small, which is economical. And fire extinguishing activity can be performed without removing the piping unit.

  The specific structure of the piping unit connected to the fire hydrant is to form a bifurcated suction passage having a connection port for the fire hose and a connection port for the drawing flow to the circulation pipe on the upper side wall of the piping unit. A connection port for the return flow from the circulation pipe is opened in the wall. The discharge pipe that hangs down on the fire hydrant may be opened at the lower wall of the water distribution pipe by reducing its lower end. The discharge pipe with the reduced opening forms a curtain state more effectively and circulates. The amount of power for the pump can be reduced. It is also possible to reduce the resistance of the water flow in the distribution pipe.

  The present invention is configured as described above, and the turbidity flowing in the bottom of the water distribution pipe is sucked by the water suction pump from the suction passage provided in the branch pipe, and the separated water excluding the turbidity is equivalent to the drawing flow. Since the return flow is at a high speed, the turbidity flowing at the bottom of the distribution pipe floats and flows, and at the same time, the return flow becomes perpendicular and curtain-like to the distribution pipe flow, so that the turbidity flows downstream. Outflow can be prevented. Then, the suspended and fluidized turbidity can be separated into the circulated material by flowing into the circulation pipe with a drawing flow at a speed faster than the flow rate of the distribution pipe. It becomes possible not only for the turbidity moving on the bottom of the water distribution pipe but also for the entire water distribution pipe to be subject to turbidity removal. Since no equipment is provided inside the distribution pipe, water resistance is low and there is no risk of water breakage by the equipment. In addition, if a fire hydrant is used, the turbidity removal unit equipment installed in the fire hydrant is not fixed to the water distribution pipe, so there will be no unforeseen circumstances such as water outage of the water distribution pipe, and stable tap water, etc. Supply is possible. Furthermore, fire extinguishing activities can be performed without removing the piping unit.

  The in-pipe turbidity removal apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a branch pipe disposed in a water distribution pipe for extracting running water, and a branch pipe 2 is suspended above the water distribution pipe 1. In the branch pipe 2, a suction flow path 3 disposed on the upstream side of the water flow of the water distribution pipe 1 and a discharge flow path 4 disposed on the downstream side of the water flow are formed perpendicular to the water distribution pipe 1. It is. On-off valves 5 and 6 are disposed at the rear end of the suction flow path 3 of the branch pipe 2 and the front end of the discharge flow path 4, and are connected to the circulation pipe 7 via the on-off valves 5 and 6. The on-off valves 5 and 6 are opened to supply the running water of the water distribution pipe 1 from the suction flow path 3 of the branch pipe 2 to the circulation pipe 7, and the water of the circulation pipe 7 is discharged from the discharge pipe 4 of the branch pipe 2 to the water distribution pipe 1. To be returned to.

  FIG. 2 shows an embodiment using a fire hydrant attached to a water pipe, and a piping unit 9 is detachably connected to the upper part of the fire hydrant 8. The piping unit 9 is formed with a suction passage 13 having a connection port 11 of a bifurcated fire hose 10 and a connection port 12 of a drawing flow to the circulation piping 7 on the upper side wall thereof. The connection port 14 of the return flow from the circulation pipe 7 is opened in the top wall. A discharge pipe 15 suspended from the inside of the piping unit 9 is supported by the connection port 14 on the top wall of the piping unit 9, and a lower part of the discharge pipe 15 hangs down from the fire hydrant 8 to discharge the discharge pipe 15. An opening 15a is formed in the vicinity of the upper wall of the water distribution pipe 1 at the lower end. Note that an open / close valve (not shown) disposed in the fire hydrant 8 is opened and a discharge pipe 15 is inserted therein. If the pipe unit 9 is connected to the fire hydrant 8 of the water distribution pipe 1 in the basin where there is no need to fix the turbidity removal device in the pipe and sand mixing or rust peeling is expected, it will be temporarily in the vicinity of the target water distribution pipe. Can be installed. There is no need to install a special fixed structure, and it is economical because it becomes a pipe turbidity removal device with simple installation and maintenance and a small installation space.

  FIG. 3 shows another embodiment of the discharge pipe hanging from the fire hydrant. The lower end of the discharge pipe 16 hanging from the fire hydrant 8 is reduced, and an opening 16 a is formed below the upper wall of the water distribution pipe 1. The discharge pipe 16 having the reduced opening 16a has a fast return flow of separated water, and the suspended matter in the pipe bottom can be violently suspended and fluidized throughout the pipe. The discharge pipe 16 having the reduced opening 16a can form a curtain state more effectively and suppress the pump power amount for circulation. It is also possible to reduce the resistance of the water flow in the water distribution pipe 1. Reference numerals 17, 18, and 19 are open / close valves disposed at the connection ports 11 and 12 of the piping unit 9 and the start ends of the discharge pipes 15 and 16.

  FIG. 4 is a flow chart of the turbidity removal device in the pipe arranged in the water distribution pipe, and the turbidity removal unit 20 is connected to the suction flow path 13 of the piping unit 9 connected to the fire hydrant 8 and the circulation pipe 7 connected to the discharge pipe 15. Is intervening. The turbidity removal unit 20 includes a water absorption pump 21 that sucks the flowing water of the water distribution pipe 1 interposed in the circulation pipe 7, and a strainer 22 that separates relatively large solids such as suspended matter, rust, and sand contained in the flowing water. A membrane device 23 for separating fine particles is provided. If the membrane device 23 is installed, it is possible to remove colored water and odor contained in tap water. When the strainer 22 and the membrane device 23 are clogged, an on-off valve 24... For switching the flow path of the circulation pipe 7 is provided, and a private generator 25 and a control panel 26 provided in the turbidity removal unit 20. Then, the water absorption pump 21 and the on-off valve 24 are operated.

  Suspended matter flowing through the bottom of the water distribution pipe 1 is sucked into the suction flow path 3 of the branch pipe 2 at a speed 10 to 30 times the flow rate by the water absorption pump 21 interposed in the circulation pipe 7. The separated water is jetted into the water distribution pipe 1 with a return flow equivalent to the suction flow to float and flow the suspended matter flowing in the bottom. At the same time, the return flow is perpendicular to the water flow in the water distribution pipe 1 and is in the form of a curtain, thereby preventing outflow to the downstream side. The suspended and fluidized turbidity is caused to flow into the circulation pipe 7 by a drawing flow at a high speed. The suspended matter moved to the circulation pipe 7 is removed by the strainer 22 and the membrane device 23 of the suspended matter removal unit 20 without being released to the atmosphere, and the removed separated water is returned to the distribution pipe 1 as a return flow. Is done. It becomes possible not only for the turbidity moving on the bottom of the water distribution pipe 1 but also for the entire water distribution pipe 1 to be subject to turbidity removal. Since no equipment is provided inside the water distribution pipe 1, water flow resistance can be reduced, and there is no fear of water breakage by the equipment.

  The turbidity removal unit 20 may be mounted on a vehicle chassis and movable. When loaded on a car chassis, the turbidity removal unit 20 can be moved to the fire hydrant 8 of the water distribution pipe 1 in the basin where sand contamination and rust peeling are expected, such as emergency water leakage work and valve operation due to a change in the water distribution plan. The turbidity removal unit 20 can be connected. It can be temporarily installed near the distribution pipe to be constructed, preventing the turbidity from flowing downstream, and easily reducing turbidity problems such as tap water. The amount of water used to wash the collected turbidity at that time only needs to be washed with a strainer during operation, and only a minimum amount of washing wastewater is discharged compared to the amount of water discarded together with the turbidity of conventional washing pipe work. It's okay. In the membrane cleaning, simple cleaning may be performed after the work is completed.

  If the fire hydrant 8 is used, since the turbidity removal equipment is not attached to the water distribution pipe 1, an unexpected situation such as a water outage state of the water distribution pipe 1 does not occur, and stable tap water can be supplied. . The pressure loss can be suppressed as compared with a conventional buried strainer in which cake filtration may occur due to clogging. In addition, construction costs are not incurred and it is economical.

  A branch pipe having a diameter of φ75 mm was suspended from a water distribution pipe having a diameter of φ150 mm, and an analysis experiment was performed by arranging the suction flow path of the branch pipe on the upstream side and the discharge flow path on the downstream side. The particle size of sand and rust contained in the running water of the water distribution pipe was approximately 0.1 to 4.8 mm. FIG. 5 is an analysis diagram showing a flow state of the water flow between the distribution pipe and the branch pipe, and FIG. 6 is an analysis diagram showing a return flow state of the branch pipe. First, in the analysis of FIGS. The water flow rate was 0.5 m / sec, the withdrawal flow rate and the return flow rate were 15 m / sec, and the flow rate of the branch pipe was 30 times the flow rate of the water distribution pipe. As a result of the analysis, the return flow injected from the branch pipe to the water pipe immediately below the branch pipe flows at 7-8 m / sec along the pipe bottom toward the upstream side. Moreover, although the flow along a pipe bottom is seen also in the downstream, it turns out that it is the separated water from which turbidity was removed.

  In the analysis of FIG. 7 and FIG. 8, the flow rate of water in the distribution pipe was set to 0.5 m / sec, the flow rate of the branch pipe was set to 10 m / sec, and the flow rate of the branch pipe was set to 20 times the flow rate of the distribution pipe. . The analysis result shows that the return flow is 3 to 4 m / sec and flows upstream along the tube bottom. Moreover, although the flow along a pipe bottom is seen also in the downstream, it turns out that it is the separated water from which turbidity was removed. In the analysis of FIG. 9 and FIG. 10, the water flow rate of the distribution pipe is set to 1.0 m / sec, the flow rate of the branch pipe is set to 10 m / sec, and the water flow rate of the branch pipe is set to 10 times the flow rate of the distribution pipe. went. The analysis result shows that the return flow is 2 to 3 m / sec and flows upstream along the tube bottom. Moreover, although the flow along a pipe bottom is seen also in the downstream, it turns out that it is the separated water from which turbidity was removed.

  Table 1 shows the flow rate ratio between the distribution pipe and the branch pipe and the flow speed at the bottom of the distribution pipe. The vertical axis shows the flow speed at the bottom of the distribution pipe immediately below the branch pipe, and the horizontal axis shows the suction of the branch pipe relative to the flow speed of the distribution pipe. It represents the flow rate ratio of the flow path.

  As shown in the above analysis results, the return flow of the branch pipe is perpendicular to the distribution pipe flow from above, so that accumulation of turbidity is prevented at the bottom of the pipe, and a turbidity floating effect is obtained. . It can be seen that the turbidity floats and flows upstream without passing through the distribution pipe flow and moves to the branch pipe along the drawing flow. When the turbidity moves with the running water at the bottom of the distribution pipe at a sufficiently high speed of drawing and pulling back, preferably, if the flow rate ratio between the distribution pipe and the branch pipe is 10 to 30 times, The flow rate of the return flow is 2 to 8 m. This indicates that the return flow from the branch pipe to the water distribution pipe can continuously float or fluidize the suspended matter moving at the bottom or depositing. At the same time, the return flow is perpendicular to the flow of the distribution pipe and is in the form of a curtain to prevent the turbidity from flowing downstream. Then, it can be seen that if the extraction flow rate is as fast as the return flow rate, the suspended turbidity can be moved to the circulation pipe. In addition, since there is a flow that blocks the flow of the water distribution pipe, a pressure loss occurs there, but under this condition, the pressure loss is 1.0 m or less.

  The in-pipe turbidity removal apparatus of the present invention is configured as described above, and the flowing water in the water distribution pipe is sucked from the branch pipe with a water absorption pump to obtain a high-speed return flow. Floating and flowing, and at the same time, the return flow of the branch pipe becomes vertical and curtain-like with the water flow of the water distribution pipe, thereby preventing the turbidity from flowing out to the downstream side. With the fast drawing flow of the branch pipe, the suspended turbidity can be separated by flowing into the circulation pipe. Moreover, since the equipment of the turbidity removal unit installed in the fire hydrant is not fixed to the water distribution pipe, an unexpected situation such as a water outage state of the water distribution pipe does not occur, and stable tap water can be supplied. And if a fire hydrant is utilized, it can also perform a fire extinguishing activity, without removing a turbidity removal unit. Therefore, it is possible to remove precipitates, remove colored water, remove odors, remove turbidity or suspended solids, and as an effective installation location, in addition to installing points due to complaints from residents, downstream of piping construction sites Temporary installation is possible.

It is a longitudinal cross-sectional view of the branch pipe suspended from the water distribution pipe of the pipe | tube turbidity removal apparatus which concerns on this invention. Similarly, it is a longitudinal cross-sectional view of a piping unit using a fire hydrant. Similarly, it is a longitudinal cross-sectional view of another embodiment of the piping unit. Similarly, it is a flowchart of an in-pipe turbidity removal apparatus. It is an analysis figure which shows the state of the flow of the water flow of a distribution pipe and a branch pipe. It is an analysis figure which shows the state of the return flow of a branch pipe. It is an analysis figure of the other Example which shows the state of the flow of the water flow of a distribution pipe and a branch pipe. It is an analysis figure of the other Example which shows the state of the return flow of a branch pipe. It is an analysis figure of the other Example which shows the state of the flow of the water flow of a distribution pipe and a branch pipe. It is an analysis figure of the other Example which shows the state of the return flow of a branch pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Distribution pipe 2 Branch pipe 3 Suction flow path 4 Discharge flow path 7 Circulation piping 8 Fire hydrant 9 Piping unit 10 Fire hose 11, 12, 14 Connection port 13 Suction flow path 15, 16 Discharge pipe 15a, 16a Opening 20 Turbidity Removal unit 21 Water absorption pump

Claims (4)

In the turbidity recovery device that draws the running water from the water distribution pipe (1) with the water absorption pump (21) and separates the turbidity contained in the running water, then returns the separated water to the water distribution pipe (1). A branch pipe (2) having a suction flow path (3) on the side and a discharge flow path (4) on the downstream side is suspended from the water distribution pipe (1), and the suction flow path (3) of the branch pipe (2) The discharge channel (4) is connected to the circulation pipe (7), and the turbidity in the flowing water sucked into the circulation pipe (7) is separated by the turbidity removal unit (20), and the branch pipe (2) The separated water is ejected from the discharge channel (4) to the running water of the distribution pipe (1), and the suspended and fluidized turbidity is caused to flow into the suction channel (3) of the branch pipe (2). In-pipe turbidity removal device. The piping unit (9) is detachably connected to the fire hydrant (8) attached to the water pipe (1), the connection port (11) of the fire hose (10) is disposed in the piping unit (9), and the piping The unit (9) is provided with a drawing flow connection port (12) and a return flow connection port (14) connected to the circulation pipe (7), respectively, and a return flow connection port (14) of the piping unit (9). The discharge pipe (15) connected to the pipe is suspended by the fire hydrant (8), and the discharge pipe (15) is opened (15a) in the vicinity of the upper wall of the water distribution pipe (1) to constitute the branch pipe (2). The in-pipe turbidity removal apparatus according to claim 1. A bifurcated suction channel (13) having a connection port (11) of the fire hose (10) and a connection port (12) for drawing flow to the circulation piping (7) is formed on the upper side wall of the piping unit (9). And the turbidity removal apparatus in a pipe | tube of Claim 2 which opened the connection port (14) of the return flow from a circulation piping (7) in the ceiling wall of the piping unit (9). The inside of the pipe according to claim 2 or 3, wherein a lower end of the discharge pipe (16) hanging from the fire hydrant (8) is reduced and an opening (16a) is provided below the upper wall of the water pipe (1). Turbid removal device.

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