Drainage system

Abstract

To provide a drainage system that is less prone to clogging by solid objects. [Solution] During drainage, the first and second pumps 10 and 20 are operated differentially to drain the solid-liquid mixture from tank 1 to drain tank 50 via the suction section 3 of filter 4, drain pipes 41 and 42, first and second working chambers 12 and 22, and drain pipes 43 and 44. When filter 4 becomes clogged, the first and second pistons 15 and 25 are moved differentially at high speed and intermittently to discharge cleaning water from cleaning water tank 51 at high pressure in a pulsed manner to the suction section 3 via cleaning pipes 45 and 46, first and second working chambers 12 and 22, and drain pipes 47 and 48, removing the solid material clogging filter 4 with an impulsive water flow.

Description

Technical Field

[0001] The present invention relates to a drainage system, and particularly to a drainage system that drains water from a solid-liquid mixed target.

Background Art

[0002] For drainage from rivers and the like, the drainage target is in a solid-liquid mixed state of solids such as sludge and pebbles and water, so solids are likely to clog the drainage system. Removing clogged solids has been a very troublesome work.

Summary of the Invention

Problem to be Solved by the Invention

[0003] The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a drainage system in which solids are less likely to clog a drainage system.

Means for Solving the Problem

[0004] The invention according to claim 1, a first pump comprising: a first cylinder provided with a first working chamber having a first inlet and a first outlet; and a first piston that reciprocates within the first cylinder; a second pump comprising: a second cylinder provided with a second working chamber having a second inlet and a second outlet; and a second piston that reciprocates within the second cylinder; a pump driving device including a rack having both ends coupled to a piston rod of the first piston and a piston rod of the second piston, a pinion gear meshing with the rack, and a motor rotationally driving the pinion gear; first and second drainage pipes connected from a suction section provided at the solid-liquid mixed drainage target to the first and second inlets of the first and second pumps, respectively; a filter provided in the suction section for removing solids from the drainage target; third and fourth drainage pipes connected from the first and second outlets of the first and second pumps to an external drainage tank, respectively; First and second valve devices provided at the first and second inlets of the first and second pumps, Third and fourth valve devices provided at the first and second outlets of the first and second pumps, Third and fourth inlets are provided in the first and second working chambers of the first and second pumps, The third and fourth outlets are provided in the first and second working chambers of the first and second pumps, The first and second cleaning pipes are connected from the external cleaning water tank to the third and fourth inlets of the first and second pumps, Third and fourth cleaning pipes connected from the third and fourth outlets of the first and second pumps to the suction section, The fifth and sixth valve devices are installed at the third and fourth inlets of the first and second pumps, The seventh and eighth valve devices are installed at the third and fourth inlets of the first and second pumps, A pump drive unit and a control device that controls the first to eighth valve devices, Equipped with, The control device is During drainage, the 5th to 8th valve devices are controlled to close, and the pump drive unit and the 1st to 4th valve devices are controlled to cause the 1st and 2nd pistons to reciprocate differentially. When the volume of the 1st working chamber decreases and the volume of the 2nd working chamber increases, the 1st valve device is closed, the 2nd valve device is opened, the 3rd valve device is opened, and the 4th valve device is closed. When the volume of the 1st working chamber increases and the volume of the 2nd working chamber decreases, the 1st valve device is opened, the 2nd valve device is closed, the 3rd valve device is closed, and the 4th valve device is opened. During filter cleaning, the first to fourth valve devices are controlled to close, and the pump drive unit and the first to fourth valve devices are controlled to intermittently differentially move the first and second pistons. When the volume of the first working chamber decreases and the volume of the second working chamber increases, the fifth valve device is closed, the sixth valve device is opened, the seventh valve device is opened, and the eighth valve device is closed. Conversely, when the volume of the first working chamber increases and the volume of the second working chamber decreases, the fifth valve device is opened, the sixth valve device is closed, the seventh valve device is closed, and the fourth valve device is opened, causing cleaning water to be discharged in a pulsed manner from the third or fourth cleaning pipe to the suction section. It is characterized by the following. In the invention described in claim 2, The washing water tank was also used as a wastewater tank. It is characterized by the following. [Effects of the Invention]

[0005] According to the drainage system of the present invention, the first and second pistons of the first and second pumps are linearly differentially reciprocated by a pump drive device including a rack and pinion mechanism, thereby enabling highly efficient and quiet drainage operation. Furthermore, even if the wastewater is in a solid-liquid mixture state, the filter installed in the suction section allows only the water to be drained. Furthermore, since the drainage system is equipped with a cleaning system, solid matter that clogs the filter due to drainage from a solid-liquid mixture can be removed, ensuring smooth drainage operation. Furthermore, cleaning water that removes solid particles clogging the filter can be sent to the suction section in a pulsed manner at high pressure, ensuring reliable clogging prevention. [Brief explanation of the drawing]

[0006] [Figure 1] This is an overall diagram of a drainage system in one embodiment of the present invention. [Modes for carrying out the invention]

[0007] Preferred embodiments of the present invention will be described below using examples. A drainage system according to one embodiment of the present invention will be described with reference to Figure 1. Figure 1 is a diagram showing the entire configuration of the drainage system according to one embodiment of the present invention. 1 is a tank containing the wastewater to be drained, 2, in a solid-liquid mixture state. 3 is a drainage suction section located at the top of tank 1, 4 is a filter located at the suction port of suction section 3 to prevent solid matter from being sucked in, 10 is a first pump, of which 11 is a first cylinder located on the first pump 10, and 12 is a first working chamber located on the first cylinder 11, having a first inlet 13 and a first discharge port 14. 15 is a first piston that reciprocates within the first working chamber 12, and 16 is a first piston rod connected to the first piston 15. The first working chamber 12 is also provided with a third inlet 17 and a third discharge port 18, which will be described later.

[0008] 20 is a second pump, positioned opposite the first pump 10. Of the second pump 20, 21 is a second cylinder provided in the second pump 20, and 22 is a second working chamber provided in the second cylinder 21, having a second inlet 23 and a second discharge port 24. 25 is a second piston that reciprocates in the second working chamber 22, and 26 is a second piston rod connected to the second piston 25. The second working chamber 22 is also provided with a fourth inlet 27 and a fourth discharge port 28, which will be described later.

[0009] 30 is a quiet rack-and-pinion type pump drive unit, of which 31 is a rack linearly arranged between the first and second pumps 10 and 20, 32 is a pinion gear meshed with the rack 31, and 33 is a motor that rotates the pinion gear 32. One end of the rack 31 is connected to the first piston rod 16, and the other end is connected to the second piston rod 26. During drainage, the motor 33, controlled by a control device described later, repeatedly rotates forward and backward at regular intervals, causing the rack 31 to reciprocate. The first and second pistons 15 and 25 of the first and second pumps 10 and 20 reciprocate differentially within the first and second cylinders 21 and 22.

[0010] The first and second inlets 13 and 23 of the first and second pumps 10 and 20 are connected to the suction section 3 by the first and second drain pipes 41 and 42, respectively. The first and second outflow ports 14, 24 of the first and second pumps 10, 20 are respectively connected to an external drainage tank 50 via third and fourth drainage pipes 43, 44.

[0011] The first and second working chambers 12, 22 of the first and second pumps 10, 20 are provided with third and fourth inflow ports 17, 27, and third and fourth outflow ports 18, 28. The third and fourth inflow ports 17, 27 are respectively connected to a cleaning water tank 51 via fifth and sixth cleaning pipes 45, 46. The third and fourth outflow ports 18, 28 of the first and second pumps 10, 20 are respectively connected to the suction unit 3 via seventh and eighth cleaning pipes 47, 48.

[0012] First and second valve devices 61, 62 are provided at the first and second inflow ports 13, 23, and third and fourth valve devices 63, 64 are provided at the first and second outflow ports 14, 24. The suction unit 3, the first drainage pipe 41, the first pump 10, the third drainage pipe 43, the second drainage pipe, the second pump 20, the fourth drainage pipe 44, and the tank 50 constitute a drainage system.

[0013] Fifth and sixth valve devices 65, 66 are provided at the third and fourth inflow ports 17, 27, and seventh and eighth valve devices 67, 68 are provided at the third and fourth outflow ports 18, 28. The tank 51, the first cleaning pipe 45, the first pump 10, the third cleaning pipe 47, the second cleaning pipe 46, the second pump 20, the fourth cleaning pipe 48, and the suction unit 3 constitute a cleaning system.

[0014] Reference numeral 70 denotes a control device, which controls the pump driving device 30 and the first to eighth valve devices 61 to 68, differentially drives the first and second pumps 10, 20 to drain water from the tank 1, and periodically pulse-drives the first and second pumps 10, 20 to discharge cleaning water in a pulsed manner to the suction unit 3, thereby cleaning clogged pores of the filter 4.

[0015] Next, the operation of the above drainage system will be described with reference to FIG. 2 and FIG. 3. (1) Drainage (see Fig. 2) During drainage, the control device 70 keeps the fifth to eighth valve devices 65 to 68 in a closed state. When draining the solid-liquid mixed drainage object 2 accumulated in the tank 1 to the drainage tank 50, the control device 70 controls the motor 33 of the pump driving device 30 to repeat forward rotation and reverse rotation at fixed time intervals, and causes the rack 31 to linearly reciprocate, thereby differentially reciprocating the first piston 15 of the first pump 10 and the second piston 25 of the second pump 20.

[0016] In Fig. 1, when the first piston 15 moves downward, the volume of the first working chamber 12 decreases, and simultaneously the second piston 25 moves upward to increase the volume of the second working chamber. Conversely, when the first piston 15 moves upward, the volume of the first working chamber 12 increases, and simultaneously the second piston 25 moves downward to decrease the volume of the second working chamber. When the first working chamber 12 decreases in volume and the second working chamber 22 increases in volume, the control device 70 closes the first valve device 61, opens the second valve device 62, opens the third valve device 63, and closes the fourth valve device 64. When the first working chamber 12 increases in volume and the second working chamber 22 decreases in volume, the control device 70 opens the first valve device 61, closes the second valve device 62, closes the third valve device 63, and opens the fourth valve device 64.

[0017] Thereby, when the first and second working chambers 12, 22 increase in volume, after solid components are removed by the filter 4 from the solid-liquid mixed drainage object in the tank 1, the drainage object flows from the suction portion 3 through the first and second drainage pipes 41, 42 into the first and second pumps 10, 20; and when the first and second working chambers 12, 22 decrease in volume, the drainage object is drained from the first and second pumps 10, 20 to the drainage tank 50 through the third and fourth drainage pipes 43, 44. By linearly differentially driving the first and second pumps 10, 20 via the rack and pinion mechanism of the pump driving device 30, an extremely quiet drainage operation can be achieved.

[0018] (2) Filter cleaning (see Fig. 3) During drainage, as time passes, the pores of the filter 4 become increasingly clogged with solid matters, and drainage efficiency gradually decreases. The drainage system in this embodiment is equipped with a self-cleaning function to remove solid matter that clogs the filter 4. In other words, the control device 70 monitors the pressure and flow rate of the first and second drain pipes 41 and 42, the drive current of the motor 33, and automatically switches to filter cleaning mode temporarily when the filter 4 becomes clogged and abnormal values ​​are detected.

[0019] During filter cleaning, the control device 70 controls the first to fourth valve devices 61 to 64 to close them. Then, in order to send the cleaning water from the cleaning water tank 51 to the suction section 3 in a pulsed manner at high pressure, the motor of the pump drive device 30 is rotated forward and backward at high speed and intermittently to cause the first and second pistons 15 and 25 to move differentially at high speed and intermittently, and the fifth to eighth valve devices 65 to 68 are controlled so that when the volume of the first working chamber 12 decreases and the volume of the second working chamber 22 increases, the fifth valve device 65 is closed, the sixth valve device 66 is opened, the seventh valve device 67 is opened, and the eighth valve device 68 is closed. Conversely, when the first and second pistons 15 and 25 move upward, the volume of the first working chamber 12 increases and the volume of the second working chamber 22 increases, the fifth valve device 65 is closed, the sixth valve device 66 is opened, the seventh valve device 67 is opened, and the eighth valve device 68 is closed.

[0020] When the first or second working chambers 12, 22 rapidly increase in volume, the cleaning water from the tank 51 rapidly enters the first or second working chambers 12, 22 through the first or second cleaning pipes 65, 66. When the first or second working chambers 12, 22 rapidly decrease in volume, the cleaning water is rapidly discharged from the first or second working chambers 12, 22 through the third or fourth cleaning pipes 67, 68 to the suction section 3. While the first and second pistons 15, 25 are stopped, the cleaning water in the first to fourth cleaning pipes 65 to 68 stops. As a result, cleaning water is discharged from the third or fourth cleaning pipes 67, 68 at high pressure in a pulsed manner to the suction section 4, and solid matter clogging the filter 4 is smoothly removed into the tank 1 by the impact water flow. After performing filter cleaning for a certain period of time, it returns to the original drainage mode.

[0021] According to this embodiment, the first and second pistons 15 and 25 of the first and second pumps 10 and 20 are linearly differentially reciprocated by a pump drive unit 30 including a rack and pinion mechanism, thereby enabling highly efficient and quiet drainage operation. Furthermore, even if the wastewater to be drained 2 is in a solid-liquid mixture state, the filter 4 installed in the suction section 3 allows only the water to be drained. Furthermore, since the drainage system is equipped with a cleaning system, solid matter that clogs the filter 4 due to drainage from a solid-liquid mixture can be removed, allowing for continued smooth drainage operation. Furthermore, cleaning water to remove any solid matter clogging the filter 4 can be intermittently sent to the suction section 3 at high pressure, ensuring that clogging is reliably prevented.

[0022] The washing water tank 51 may also be used in conjunction with the drainage tank 50. [Industrial applicability]

[0023] This invention can be applied when it is necessary to drain wastewater from a solid-liquid mixture at sites such as rivers, ponds, and tunnels. [Explanation of symbols]

[0024] 1 tank 2. Items to be drained 3. Suction section 4 filters 10. First pump 20. Second pump 30 Pump drive unit 41. First drain pipe 42 Second drain pipe 43 Third drain pipe 44. Fourth drain pipe 45 First cleaning pipe 46. ​​Second cleaning pipe 47 Third cleaning pipe 48. Fourth cleaning pipe 50 drainage tanks 51 Washing water tank 70 Control device

Claims

1. A first pump comprising a first cylinder having a first working chamber with a first inlet and a first outlet, and a first piston that reciprocates within the first cylinder, A second pump comprising a second cylinder having a second working chamber with a second inlet and a second outlet, and a second piston that reciprocates within the second cylinder, A pump drive device including a rack with both ends connected to the piston rod of the first piston and the piston rod of the second piston, a pinion gear that meshes with the rack, and a motor that rotates the pinion gear, First and second drainage pipes are connected from a suction section installed at the wastewater source in a solid-liquid mixture state to the first and second inlets of the first and second pumps, A filter is provided in the suction section to remove solid matter from the wastewater, The first and second outlets of the first and second pumps are connected to the third and fourth drainage pipes leading to the external drainage tank, First and second valve devices provided at the first and second inlets of the first and second pumps, Third and fourth valve devices provided at the first and second outlets of the first and second pumps, Third and fourth inlets are provided in the first and second working chambers of the first and second pumps, Third and fourth outlets provided in the first and second working chambers of the first and second pumps, The first and second cleaning pipes are connected from the external cleaning water tank to the third and fourth inlets of the first and second pumps, Third and fourth cleaning pipes connected from the third and fourth outlets of the first and second pumps to the suction section, Fifth and sixth valve devices installed at the third and fourth inlets of the first and second pumps, The seventh and eighth valve devices are installed at the third and fourth inlets of the first and second pumps, A pump drive unit and a control device that controls the first to eighth valve devices, Equipped with, The control device is During drainage, the fifth to eighth valve devices are controlled to close, and the pump drive unit and the first to fourth valve devices are controlled to cause the first and second pistons to reciprocate differentially. When the volume of the first working chamber decreases and the volume of the second working chamber increases, the first valve device is closed, the second valve device is opened, the third valve device is opened, and the fourth valve device is closed. When the volume of the first working chamber increases and the volume of the second working chamber decreases, the first valve device is opened, the second valve device is closed, the third valve device is closed, and the fourth valve device is opened. During filter cleaning, the first to fourth valve devices are controlled to close, and the pump drive unit and the first to fourth valve devices are controlled to differentially move the first and second pistons in a pulsed manner, In this case, when the volume of the first working chamber decreases and the volume of the second working chamber increases, the fifth valve device is closed, the sixth valve device is opened, the seventh valve device is opened, and the eighth valve device is closed. Conversely, when the volume of the first working chamber increases and the volume of the second working chamber decreases, the fifth valve device is opened, the sixth valve device is closed, the seventh valve device is closed, and the fourth valve device is opened, causing the cleaning water to be discharged in a pulsed manner from the third or fourth cleaning pipe to the suction section. A drainage system characterized by the following.

2. The washing water tank was also used as a wastewater tank. A drainage system according to claim 1 or 2, characterized by the following:

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