JP6722065B2 - Drainage system, drainage pump car and drainage method - Google Patents

Description

The present invention relates to a drainage system, a drainage pump car, and a drainage method.

In recent years, a large amount of water has been generated at unspecified locations due to sudden rainfall, such as heavy rains of guerrillas. Large-scale typhoons have caused large-scale floods and tsunamis have caused large-scale inundation damage, and there are situations in which drainage from fixed pumping stations cannot prevent flooding.

In order to solve the problem of drainage at sudden and unspecified locations, a "drainage pump car" that allows drainage at unspecified locations by loading equipment required for drainage on the vehicle platform is in operation. .. At unspecified locations, the height of the embankment may be higher than usual, or the distance to the drainage location may be long due to underpasses on the road, etc., which may increase the pump head. In order to cope with the height difference and drainage over a long distance, which cannot be handled by the lift of one pump, pumps that can be connected in series have been developed that can secure drainage over a higher head or a longer distance.

It is also possible to use the mobility (lightness) of a portable pump to take in lakes, rivers, seawater, etc. and use it as cooling water in an emergency. In this case, it is necessary to adjust the amount of water appropriately.

Patent Document 1 includes a plurality of pump drive devices that drive a permanent magnet synchronous motor connected to a pump with an inverter, and in a pump control device that controls the operation of a plurality of pumps connected in series, the pump drive device is It is equipped with a voltage detector that detects the input voltage of the inverter and outputs an abnormal voltage signal when it exceeds a specified voltage.A switch is provided between the pump drive unit and the permanent magnet synchronous motor driven by the pump drive unit. Is provided, and it is disclosed that a switch control circuit is provided which opens the switch when receiving either an abnormal signal or an abnormal voltage signal indicating that the inverter is abnormal. That is, the invention of Patent Document 1 is to stop the motor when an abnormality occurs.

In Patent Document 2, the operation control device sequentially activates the drainage pump on the downstream side at a predetermined load factor lower than the rating after activating the drainage pump on the upstream side, and the drainage pump on the downstream side operates in a predetermined operation state. It is disclosed that when the start threshold value is exceeded, the downstream drainage pump is switched to the rated operation, and when the rated operation is exceeded the upper limit threshold value or the lower limit threshold value, the operation is stopped. That is, the invention of Patent Document 2 relates to pump control at startup and emergency stop at rated operation.

JP, 2004-156559, A JP, 2009-264351, A

The present invention addresses the problems that occur when pumps are connected in series and operated.

The drainage system according to the first aspect of the present invention includes a plurality of pumps provided with a submersible drive motor, a pipe connecting the plurality of pumps in series, and a plurality of pumps of the plurality of pumps except at the time of operation start and operation stop. When changing the drainage of one of the pumps, the controller continues the operation of the pump while changing the drainage of the other pump in conjunction with the change.

In the above drainage system, one pump may be the most upstream pump among the plurality of pumps when increasing the amount of drainage.

In the above drainage system, one pump may be the most downstream pump among the plurality of pumps when reducing the amount of drainage.

In the drainage system, when the pump on the upstream side of the plurality of pumps is an upstream pump and the pump on the downstream side of the upstream pump is a downstream pump, the controller causes water to flow to the downstream pump during the interlocking. The discharge amount of another pump may be changed so as to prevent supply shortage.

In the above drainage system, the control device makes the rate of reducing the drainage rate of the downstream pump equal to or greater than the rate of reducing the drainage rate of the upstream pump during the interlocking except when the operation is started and stopped. It may be configured as follows.

In any one of the above drainage systems, the control device, when the operation is not started or stopped, at the time of the interlocking, the rate of increasing the drainage of the downstream pump is the same as the rate of increasing the drainage of the upstream pump. It may be configured to be smaller.

In any of the above drainage systems, the control device, except at the time of operation start and operation stop, when increasing the drainage amount of the drainage system, from the upstream pump to the downstream pump of the plurality of pumps, It may be configured to sequentially increase the amount of drainage.

In any one of the above drainage systems, the control device, except at the time of operation start and operation stop, when reducing the amount of drainage of the drainage system, from the downstream pump to the upstream pump of the plurality of pumps, It may be configured to sequentially reduce the amount of drainage.

In any one of the above drainage systems, the control device sets the rate of increase in the drainage amount per hour of the upstream side pump to the downstream side pump at the time of the interlocking among the plurality of pumps except when the operation is started and stopped. May be configured to be larger than the hourly drainage rate increase rate, and the upstream side pump drainage rate reduction rate may be smaller than the downstream pump hourly drainage rate reduction rate.

In any one of the above drainage systems, even if the control device is configured to reduce the drainage amount of all pumps for a certain period of time when an abnormality occurs in the most upstream pump among the plurality of pumps. Good.

A drainage method according to a second aspect of the present invention uses a plurality of pumps provided with an underwater drive motor and a pipe that connects the plurality of pumps in series, and uses the plurality of pumps at a time other than operation start and operation stop. When the discharge amount of one of the pumps is changed, the discharge amount of the other pump is changed in conjunction with the change and the operation of the pump is continued.

In the drainage method, one pump may be the most upstream pump among the plurality of pumps.

In the drainage method, one pump may be the most downstream pump among the plurality of pumps.

The drainage method may change the drainage amount of another pump during the interlocking operation so that a shortage of water supply to the downstream pump does not occur.

The drainage pump vehicle of the third aspect of the present invention is a drainage pump vehicle equipped with the drainage system according to any one of the above.

According to the present invention, it is possible to reduce the possibility that the downstream pump will be damaged when the pumps are connected in series and operated.

Schematic diagram of the drainage system according to the first embodiment A schematic side sectional view of the pump Schematic diagram of the drainage system according to the second embodiment

When connecting in series, generally, the first unit is put into water and the second unit is installed on land via a hose. The present inventors diligently studied the problems caused by such a configuration. As a result, the following findings were obtained.

The pump installed above the ground may be burned out if it is not operated in a state where water is surely supplied. When serial connection is required, the height difference is large and the distance is long, so the pump installation position is far from the operator, and it is difficult to constantly monitor. Also, for example, it is necessary to adjust the operating state (displacement volume) of the second pump (onshore) according to changes in the operating state (displacement volume) of the first pump (underwater), which is not easy for the operator to operate. Absent. In order to deal with such a problem, it is effective to appropriately control the drainage amount of each pump connected in series so that the water supply to the pump on the downstream side does not become insufficient.

The present invention has been completed based on such findings.

Hereinafter, a drainage system and a drainage method according to embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
[Device configuration]
FIG. 1 is a schematic diagram of a drainage system according to the first embodiment. FIG. 2 is a schematic side sectional view of the pump. Hereinafter, the drainage system 100 of the first embodiment will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the drainage system 100 includes a first pump 10 and a second pump 20, a first pipe 12 and a second pipe 22, and a control device 80 (control panel). In the example shown in FIG. 1, the drainage system 100 further includes a power supply device 90 (generator) and is mounted on the drainage pump vehicle 150, but these are not essential.

The first pump 10 and the second pump 20 are pumps (so-called submersible pumps) including an underwater drive motor. As the pump, an axial flow pump, a mixed flow pump, a volute pump or the like can be used.

In the example shown in FIG. 1, the first pump 10 is suspended from a float 70 and installed in water. In the example shown in FIG. 1, the second pump 20 is installed on land. However, a mode in which the second pump 20 is arranged in water is not excluded. The first pump 10 and the second pump 20 may be of the same type or different types. Of the plurality of pumps, the pump installed on land may be a type of pump in which the electric motor is cooled by water passing through the inside. Specifically, the second pump 20 may be a type of pump in which the electric motor is cooled by water passing through the inside thereof. Also in this case, the other pump installed in the water may be a pump of a type in which the electric motor is cooled by the water passing through the inside.

The drainage port of the first pump 10 and the water intake port of the second pump 20 are connected by a first pipe 12. That is, the first pump 10 and the second pump 20 are connected in series by the first pipe 12. In such a configuration, the water sucked up by the first pump 10 is increased in pressure by the second pump 20, and is discharged downstream.

The drainage port of the second pump 20 and the reservoir 1 are connected by a second pipe 22. The 1st piping 12 and the 2nd piping 22 can be constituted by a hose, for example. A suction nozzle may be attached to the water inlet of the first pump 10.

In such a configuration, water flows from the first pump 10 through the second pump 20 to the reservoir 1.

The first pump 10 and the second pump 20 may be of a weight that can be carried by one person. Specifically, for example, the weight of each of the first pump 10 and the second pump 20 can be set to 20 kg to 40 kg. In order to reduce the weight, the first pump 10 and the second pump 20 may have a simple configuration without a temperature sensor or the like. The first pump 10 and the second pump 20 may be inverter control type pumps.

The controller 80 changes the drainage amount of one of the plurality of pumps 10 and 20 (for example, the first pump 10) except when the operation is started and when the operation is stopped. The operation of at least one of the pumps 10 and 20 is continued while changing the drainage amount of the pump (for example, the second pump 20). “Discharge amount” may be the volume of water discharged by the pump per unit time. The change of the drainage amount can be realized by changing the rotation speed, for example. That is, the discharge amount and the rotation speed may be equivalent in control in some cases. It should be noted that the one change of the drainage amount of the pump here does not include “start” that increases the drainage amount from zero and “stop” that makes the drainage amount zero. Changing the displacement of other pumps may include starting and stopping. When interlocking, the drainage amount of each pump may be changed so that a shortage of water supply to the second pump 20 does not occur.

The control device 80 may be in any form as long as it is a device that controls the first pump 10 and the second pump 20, and can be configured by, for example, a microprocessor, a CPU, or the like. In addition, the control device 80 is not limited to a configuration including a single controller (centralized control), but a configuration including a controller group in which a plurality of controllers cooperate to execute control of the drainage system 100 ( Distributed control). The control device 80 may include not only an arithmetic processing unit such as a microprocessor and a CPU, but also a storage unit including a memory and a timekeeping unit, and may be configured by a microcomputer.

The control device 80 and the first pump 10 are connected by the first cable 14. Electric power is supplied from the control device 80 to the first pump 10 via the first cable 14. The controller 80 controls the operation of the first pump 10 via the first cable 14.

The control device 80 and the second pump 20 are connected by a second cable 24. Electric power is supplied from the control device 80 to the second pump 20 via the second cable 24. The controller 80 controls the operation of the second pump 20 via the second cable 24.

In the example shown in FIG. 1, power is supplied from the power supply device 90 to the control device 80. Further, in the example shown in FIG. 1, the drainage system 100 is mounted on the drainage pump vehicle 150. At the time of movement, the first pump 10, the second pump 20, the first pipe 12, the second pipe 22, the first cable 14, the second cable 24, and the float 70 may be stored in the drain pump vehicle 150.

FIG. 2 is a schematic side sectional view of the second pump 20. The diameter of the tubular outer wall 55 on the side of the water intake port 51 is constricted and has a trumpet shape. The first pipe 12 is attached to the water intake port 51 in a watertight manner. The second pipe 22 is attached to the drain port 53 in a watertight manner. An electric motor 50 is provided in a space formed inside the outer wall 55 and is supported by a support member 58. The electric motor 50 is supplied with power by the second cable 24 and its operation is controlled. A rotary shaft 54 extends on the water intake 51 side of the electric motor 50. The rotary blades 52 are attached to the rotary shaft 54. When the electric motor 50 rotates the rotary blades 52 via the rotary shaft 54, a water flow is generated from the water intake port 51 through the flow path 56 toward the drain port 53. As a result, water is pumped by the second pump 20. Furthermore, the water flows through the flow path 56, whereby the electric motor 50 is cooled.

Regarding the first pump 10, the first pipe 12 connected to the water intake port 51 in FIG. 2 is omitted, and the pipe 22 connected to the drain port 53 becomes the first pipe 12 and the second pump 20. It can have a similar configuration. Therefore, detailed description is omitted.

[motion]
When the drainage amount of one of the plurality of pumps 10 and 20 is changed except when the operation is started and stopped, the drainage system 100 changes the drainage amount of the other pumps in association with the change. The operation of the plurality of pumps 10 and 20 is continued. Hereinafter, a specific method of such operation will be described. Note that the following are merely examples, and none of them is essential.

In the present embodiment, “at the start of operation” means, for example, the time from the start of execution of the operation start sequence to the steady operation after the power of the drainage system 100 is turned on, that is, when the operation of the drainage system 100 is started. The time during which a series of processes is executed.

In the present embodiment, “at the time of operation stop” means, for example, the time from the start of execution of the operation stop sequence to the stop of the pump after the operation stop instruction is input, that is, when the operation of the drainage system 100 is stopped. The time during which a series of processes is executed.

In the present embodiment, “other than at the start of operation and at the time of stop of operation” means, for example, an operation excluding the time from the start of execution of the operation start sequence to the steady operation and the time from the start of execution of the operation stop sequence to the stop of the pump. It can be defined as medium time. The term "other than when the operation is started and when the operation is stopped" may be, for example, the time from the time when the power of the drainage system is turned on and the output of each pump reaches the target value to the start of the operation stop sequence. ..

In addition, in the present embodiment, when the discharge amount of one of the plurality of pumps 10 and 20 is changed except when the operation is started and stopped, the discharge amount of the other pump is changed in association with the change. The operation of the plurality of pumps 10 and 20 may be continued while the operation is being performed. Therefore, even when the drainage amount of one of the plurality of pumps 10 and 20 is changed at other times, for example, at least one of the start of operation and the stop of operation, other changes are made in conjunction with the change. The operation of the plurality of pumps 10 and 20 may be continued while changing the drainage amount of the pumps.

In this embodiment, “upstream” or “downstream” refers to upstream or downstream along the flow of water discharged by the drainage system through the drainage system.

The following operation can be realized by the control of the first pump 10 and the second pump 20 by the control device 80, for example.

1. Example of reducing the amount of drainage of the first pump 10 When reducing the amount of drainage of the first pump 10, if the rate of reducing the amount of drainage of the second pump 20 is insufficient, the second pump 20 runs out of water (of the amount of water supplied to the pump). Insufficiency, the same applies hereinafter) may occur and the second pump 20 may be damaged. Therefore, when the drainage amount of the first pump 10 is reduced except when the operation is started and stopped, the rate of reducing the drainage amount of the second pump 20 (downstream pump) is set to the drainage amount of the first pump 10 (upstream pump). It should be equal to or larger than the reduction rate (for example, 10% reduction) (for example, 20% reduction). Such an operation reduces the possibility that the second pump 20 installed on land will run out of water. After the amount of drainage is reduced, the operation of both the first pump 10 and the second pump 20 can be continued.

The timing for reducing the amount of drainage of the second pump 20 (downstream pump) is not particularly limited. For example, the timing may be earlier than the timing of reducing the drainage amount of the first pump 10 (upstream pump), or both may be simultaneous.

The rate and timing of reducing the drainage amount can be appropriately set according to the head height, the pipe length, the drainage amount, and the like so that the second pump 20 is not damaged.

2. Example of increasing the amount of drainage of the first pump 10 When increasing the amount of drainage of the first pump 10, if the rate of increasing the amount of drainage of the second pump 20 becomes too large, the second pump 20 runs out of water, and the second pump 20 20 may be damaged. Therefore, when the drainage amount of the first pump 10 is increased except when the operation is started and stopped, the rate of increasing the drainage amount of the second pump 20 (downstream pump) is set to the drainage amount of the first pump 10 (upstream pump). It should be equal to or smaller than the rate of increase (for example, 20% increase) (for example, 10% increase). Such an operation reduces the possibility that the second pump 20 installed on land will run out of water. After the amount of drainage increases, the operation of both the first pump 10 and the second pump 20 can be continued.

The timing of increasing the amount of drainage of the second pump 20 (downstream pump) is not particularly limited. For example, it may be later than the timing of increasing the drainage amount of the first pump 10 (upstream pump), or both may be simultaneous.

Note that the rate and timing of increasing the drainage amount can be appropriately set according to the head height, the pipe length, the drainage amount, etc. so that the second pump 20 is not damaged.

When increasing the drainage of the upstream pump, the drainage of the downstream pump does not necessarily have to be increased.

3. Example of sequentially increasing the drainage amount of the pump When increasing the drainage amount of the drainage system 100, if the drainage amount of the second pump 20 (pump on the downstream side) is increased first, the second pump 20 runs out of water, The second pump 20 may be damaged. Therefore, when increasing the drainage amount of the drainage system 100 except when the operation is started and stopped, the drainage amount is sequentially applied from the first pump 10 on the upstream side to the second pump 20 on the downstream side among the plurality of pumps 10, 20. To increase. Note that "sequentially" means "sequentially in time" (hereinafter the same). Such an operation reduces the possibility that the second pump 20 installed on land will run out of water. After the amount of drainage increases, the operation of both the first pump 10 and the second pump 20 can be continued.

The rate and timing of increasing the drainage amount can be appropriately set according to the height of the lift, the pipe length, the drainage amount, and the like so that the second pump 20 is not damaged.

4. Example of sequentially reducing the drainage amount of the pump When reducing the drainage amount of the drainage system 100, if the drainage amount of the first pump 10 (upstream side pump) is reduced first, the second pump 20 will run out of water, The second pump 20 may be damaged. Therefore, when the drainage amount of the drainage system 100 is reduced except when the operation is started and stopped, the drainage amount is sequentially increased from the second pump 20 on the downstream side to the first pump 10 on the upstream side of the plurality of pumps 10, 20. To reduce. Such an operation reduces the possibility that the second pump 20 installed on land will run out of water. After the amount of drainage is reduced, the operation of both the first pump 10 and the second pump 20 can be continued.

The rate and timing of reducing the drainage amount can be appropriately set according to the head height, the pipe length, the drainage amount, and the like so that the second pump 20 is not damaged.

5. Example of adjusting the rate of change in the amount of discharged water per hour of the pump When the amount of change of the amount of discharged water per hour of the drainage system 100 is changed, if the rate of change of the amount of discharged water per hour of the pump is improper, the second pump 20 will run out of water and the second pump 20 will May be damaged. Therefore, except when the operation is started and stopped, the hourly drainage rate of the upstream first pump 10 among the plurality of pumps 10, 20 is higher than the hourly drainage rate of the downstream second pump 20. The drainage reduction rate per hour of the upstream first pump 10 is made smaller than the drainage reduction rate per hour of the downstream second pump 20. Such an operation reduces the possibility that the second pump 20 installed on land will run out of water. After the amount of drainage is reduced, the operation of both the first pump 10 and the second pump 20 can be continued.

The rate and timing of increasing/decreasing the amount of drainage can be appropriately set according to the height of the head, the length of the pipe, the amount of drainage, etc. so that the second pump 20 will not be damaged.

6. Clearing the clogging of the water intake port When the drainage system 100 is operated, dust may be collected at the water intake port and the water intake port may be clogged. Therefore, when an abnormality occurs in the most upstream pump among the plurality of pumps, the drainage amounts of all the pumps may be reduced for a certain period of time. As the abnormality, specifically, for example, the discharge pressure of the pump does not rise, the amount of drainage is small, the pump is overheated, and the like. The “reduction” here may include stopping the pump. “Reducing” does not have to include stopping the pump. By reducing the number of rotations of the pump, water flows backward along the flow path, so-called "normal reverse flow" occurs. By reducing the amount of water discharged from the pump for a certain period of time, water flows backward and dust is separated from the water intake port, which makes it easier to absorb water again.

The drainage system 100 of the first embodiment may execute any one of the operations 1 to 6 described above, may execute any combination, or may execute all of them. It may be one. The above control can be performed so as to reduce the possibility that the second pump 20 will run out of water. That is, it does not necessarily mean that drainage is completely prevented, and it is sufficient if the possibility of drainage is reduced. More specifically, for example, the adjustment may be performed by applying an appropriate water pressure so that the first pipe 12 (hose) connecting the first pump 10 and the second pump 20 is not crushed. By preventing the pipe (hose) from collapsing, more appropriate flow rate control becomes possible.

In the example shown in FIG. 1, the drainage port of the drainage system 100 (the outlet of the second pipe 22) is open to the reservoir 1, but the invention is not limited to this mode. For example, the drainage port of the drainage system 100 may be connected to a water delivery vehicle (not shown) equipped with a land pump, and the water delivery vehicle may deliver water to a predetermined location. Water transmission by a water truck can be used for fire extinguishing, cooling, and the like.
(Second embodiment)
[Device configuration]
FIG. 3 is a schematic diagram of the drainage system according to the second embodiment. Hereinafter, the drainage system 200 of the second embodiment will be described with reference to FIG. 3.

As shown in FIG. 3, the drainage system 200 includes a first pump 10, a second pump 20, and a third pump 30, a first pipe 12, a second pipe 22, and a third pipe 32, and a controller 80. .. In the example shown in FIG. 3, the drainage system 200 further includes the power supply device 90 and is mounted on the drainage pump vehicle 150, but these are not essential.

In the drainage system 200, the outlet of the second pipe 22 is connected to the water intake of the third pump 30. The drain port of the third pump 30 is connected to the inlet of the third pipe 32. The outlet of the third pipe 32 is open to the reservoir 1. In this configuration, water flows to the reservoir 1 via the first pump 10, the second pump 20, and the third pump 30. The outlet of the third pipe 32 may be connected to a water truck (not shown) equipped with a land pump, and water may be fed to a predetermined place by the water truck.

The drainage port of the first pump 10 and the water intake port of the second pump 20 are connected by a first pipe 12. The drainage port of the second pump 20 and the water intake port of the third pump 30 are connected by a second pipe 22. That is, the first pump 10, the second pump 20, and the third pump 30 are connected in series by the first pipe 12 and the second pipe 22. The 1st piping 12, the 2nd piping 22, and the 3rd piping 32 can be constituted by a hose, for example.

In the example shown in FIG. 3, the third pump 30 is arranged on land, but the case where one or both of the second pump 20 and the third pump 30 are arranged in water is not excluded. The specific configuration of the third pump 30 can be the same as that of the second pump 20, and thus detailed description thereof will be omitted.

The control device 80 and the third pump 30 are connected by the third cable 34. Electric power is supplied from the control device 80 to the third pump 30 via the third cable 34. The controller 80 controls the operation of the third pump 30 via the third cable 34.

In the example shown in FIG. 3, the drainage system 200 is mounted on the drainage pump vehicle 150. During movement, the first pump 10, the second pump 20, the third pump 30, the first pipe 12, the second pipe 22, the third pipe 32, the first cable 14, the second cable 24, the third cable 34, and the float. 70 may be stored in the drainage pump car 150.

In addition to the above, the drainage system 200 of the second embodiment can have the same configuration as the drainage system 100 of the first embodiment. Therefore, the components common to FIG. 1 and FIG. 3 are given the same reference numerals and names, and detailed description thereof will be omitted.

[motion]
When the drainage amount of one of the plurality of pumps 10, 20, 30 is changed except when the operation is started and stopped, the drainage system 200 changes the drainage amount of the other pumps in association with the change. While continuing, the operation of the plurality of pumps 10, 20, 30 is continued. Hereinafter, a specific method of such operation will be described. Note that the following are merely examples, and none of them is essential.

In the present embodiment, “at the start of operation” means, for example, the time from the start of execution of the operation start sequence to the steady operation after the power of the drainage system 200 is turned on, that is, when the operation of the drainage system 200 is started. The time during which a series of processes is executed.

In the present embodiment, “at the time of operation stop” refers to, for example, the time from the start of execution of the operation stop sequence to the stop of the pump after the operation stop instruction is input, that is, when the operation of the drainage system 200 is stopped. The time during which a series of processes is executed.

In the present embodiment, “other than at the start of operation and at the time of stop of operation” means, for example, an operation excluding the time from the start of execution of the operation start sequence to the steady operation and the time from the start of execution of the operation stop sequence to the stop of the pump. It can be defined as medium time. The term "other than when the operation is started and when the operation is stopped" may be, for example, the time from the time when the power of the drainage system is turned on and the output of each pump reaches the target value to the start of the operation stop sequence. ..

In the present embodiment, when the drainage amount of one of the plurality of pumps 10, 20, 30 is changed except when the operation is started and stopped, the drainage amounts of the other pumps are linked with the change. It suffices to continue the operation of the plurality of pumps 10, 20, 30 while changing the above. Therefore, even when the drainage of one of the plurality of pumps 10, 20, 30 is changed at other times, for example, at least one of the operation start and the operation stop, the change is linked to the change. The operation of the plurality of pumps 10, 20, 30 may be continued while changing the drainage amounts of the other pumps.

In this embodiment, “upstream” or “downstream” refers to upstream or downstream along the flow of water discharged by the drainage system through the drainage system.

The following operation can be realized by the control of the first pump 10, the second pump 20, and the third pump 30 by the control device 80, for example.

1. Example of reducing the amount of drainage of the first pump 10 In the case of reducing the amount of drainage of the first pump 10, if the rate of reducing the amount of drainage of the second pump 20 and the third pump 30 is insufficient, the second pump 20 to the third pump 30. In this case, water may run out and the second pump 20 to the third pump 30 may be damaged. Therefore, when the drainage amount of the first pump 10 is reduced except when the operation is started and stopped, the rate of reducing the drainage amount of the second pump 20 (downstream pump) is set to the drainage amount of the first pump 10 (upstream pump). It should be equal to or larger than the rate of reduction (for example, 10% reduction) (for example, 15% reduction). Further, the rate of reducing the amount of drainage of the third pump 30 (downstream pump) is made equal to or greater than the rate of reducing the amount of drainage of the second pump 20 (upstream pump) (for example, 15% reduction) (for example, 20). % Decrease). That is, for a pair of pumps adjacent to each other along the flow of water in the pipe, the rate of reducing the discharge amount of the downstream pump may be equal to or greater than the rate of reducing the discharge amount of the upstream pump. it can. Such an operation reduces the possibility that the second pump 20 to the third pump 30 installed on land will run out of water. After the amount of drainage is reduced, the operation of any of the first pump 10, the second pump 20, and the third pump 30 can be continued.

For all pairs of pumps that are adjacent to each other along the flow of water in the pipe, the rate of reducing the displacement of the pump on the downstream side is equal to or greater than the rate of reducing the displacement of the pump on the upstream side. Good.

The timing for reducing the amount of drainage of the second pump 20 (downstream pump) is not particularly limited. For example, the timing may be earlier than the timing of reducing the drainage amount of the first pump 10 (upstream pump), or both may be simultaneous.

The timing for reducing the amount of drainage of the third pump 30 (downstream pump) is not particularly limited. For example, it may be later than the timing of reducing the amount of drainage of the second pump 20 (upstream pump), or both of them may be performed at the same time.

The rate and timing of reducing the drainage amount can be appropriately set according to the head height, the pipe length, the drainage amount, and the like so that the second pump 20 to the third pump 30 are not damaged.

2. Example of Increasing Discharge of First Pump 10 When increasing the discharge of the first pump 10, if the ratio of increasing the discharge of the second pump 20 and the third pump 30 is too large, the second pump 20 to the third pump The water may run out at 30, which may damage the second pump 20 to the third pump 30. Therefore, when the drainage amount of the first pump 10 is increased except when the operation is started and stopped, the rate of increasing the drainage amount of the second pump 20 (downstream pump) is set to the drainage amount of the first pump 10 (upstream pump). It is equal to or smaller than the rate of increase (for example, 20% increase) (for example, 15% increase). Further, the rate of increasing the amount of drainage of the third pump 30 (downstream pump) is equal to or smaller than the rate of increasing the amount of drainage of the second pump 20 (upstream pump) (for example, 15% increase) (for example, 10 % Increase). That is, for a pair of pumps adjacent to each other along the flow of water in the pipe, the rate of increasing the drainage of the downstream pump may be the same as or smaller than the rate of increasing the drainage of the upstream pump. it can. Such an operation reduces the possibility that the second pump 20 to the third pump 30 installed on land will run out of water. After the amount of drainage increases, the operation of any of the first pump 10, the second pump 20, and the third pump 30 can be continued.

For all pairs of pumps that are adjacent to each other along the flow of water in the pipe, the rate of increasing the displacement of the downstream pump is the same as or smaller than the rate of increasing the displacement of the upstream pump. Good.

The timing of increasing the amount of drainage of the second pump 20 (downstream pump) is not particularly limited. For example, the timing may be earlier than the timing of increasing the drainage amount of the first pump 10 (upstream pump), or both may be simultaneous.

The timing for increasing the amount of drainage of the third pump 30 (downstream pump) is not particularly limited. For example, it may be later than the timing of increasing the amount of drainage of the second pump 20 (upstream pump), or both may be simultaneous.

The rate and timing of increasing the drainage amount can be appropriately set according to the head height, the pipe length, the drainage amount, and the like so that the second pump 20 to the third pump 30 are not damaged.

3. Example of sequentially increasing the drainage amount of the pump When increasing the drainage amount of the drainage system 200, if the drainage amount of the downstream side pump is increased first, the downstream side pump will run out of water and the downstream side pump will be damaged. There is something to do. Therefore, when the amount of drainage of the drainage system 200 is increased except when the operation is started and when the operation is stopped, the first pump 10 on the upstream side of the plurality of pumps 10, 20, 30 is sequentially connected to the third pump 30 on the downstream side. The drainage amount is increased (first pump 10, second pump 20, third pump 30 in this order). Such an operation reduces the possibility that the second pump 20 to the third pump 30 installed on land will run out of water. After the amount of drainage increases, the operation of any of the first pump 10, the second pump 20, and the third pump 30 can be continued.

The rate and timing of increasing the drainage amount can be appropriately set according to the head height, the pipe length, the drainage amount, and the like so that the second pump 20 to the third pump 30 are not damaged.

4. Example of sequentially reducing the drainage amount of the pump When reducing the drainage amount of the drainage system 200, if the drainage amount of the upstream pump is reduced first, the downstream pump will run out of water and the downstream pump will be damaged. There is something to do. Therefore, when the amount of drainage of the drainage system 200 is reduced except when the operation is started and stopped, the third pump 30 on the downstream side of the plurality of pumps 10, 20, 30 is sequentially connected to the first pump 10 on the upstream side. The amount of drainage is reduced (first pump 10, second pump 20, third pump 30 in this order). Such an operation reduces the possibility that the second pump 20 to the third pump 30 installed on land will run out of water. After the amount of drainage is reduced, the operation of any of the first pump 10, the second pump 20, and the third pump 30 can be continued.

The rate and timing of reducing the drainage amount can be appropriately set according to the head height, the pipe length, the drainage amount, and the like so that the second pump 20 to the third pump 30 are not damaged.

5. Example of adjusting the rate of change in the amount of discharged water per hour of the pump When changing the amount of discharged water of the drainage system 200, if the rate of change of the amount of discharged water per hour of the pump is inappropriate, the second pump 20 to the third pump 30 run out of water, The second pump 20 to the third pump 30 may be damaged. Therefore, except when the operation is started and stopped, the hourly drainage increase rate of the upstream first pump 10 among the plurality of pumps 10, 20, 30 is defined as the hourly drainage increase rate of the downstream second pump 20. The reduction rate per hour of the upstream first pump 10 is smaller than the reduction rate per hour of the downstream second pump 20. Further, the rate of increase in the amount of drainage per hour of the second pump 20 on the upstream side is made larger than the rate of increase in the amount of drainage per hour of the third pump 30 on the downstream side, and the rate of reduction of the amount of drainage per hour of the second pump 20 on the upstream side is set to the downstream side. It is smaller than the rate of reduction of the amount of drainage of the third pump 30 per hour. That is, for a pair of pumps that are adjacent to each other along the flow of water in the pipe, the rate of increase in the amount of drainage per hour of the pump on the upstream side is made larger than the rate of increase in the amount of drainage per hour of the pump on the downstream side. The rate of reduction of wastewater per hour should be smaller than the rate of reduction of wastewater per hour of the downstream pump. By such an operation, the possibility that the second pump 20 to the third pump 30 installed on land will run out of water is reduced. After the amount of drainage is reduced, the operation of any of the first pump 10, the second pump 20, and the third pump 30 can be continued.

For all pairs of pumps that are adjacent to each other along the flow of water in the pipe, make sure that the upstream pump's hourly drainage rate is greater than the downstream pump's hourly drainage rate. The drainage reduction rate per hour may be smaller than the drainage reduction rate per hour of the downstream pump.

The rate and timing of increasing/decreasing the amount of drainage can be appropriately set according to the height of the lift, the length of the pipe, the amount of drainage, etc. so that the second pump 20 to the third pump 30 are not damaged.

6. Clearing the clogging of the water intake port When the drainage system 200 is operated, dust may collect at the water intake port, causing clogging of the water intake port. Therefore, when an abnormality occurs in the most upstream pump among the plurality of pumps, the drainage amounts of all the pumps may be reduced for a certain period of time. As the abnormality, specifically, for example, the discharge pressure of the pump does not rise, the amount of drainage is small, the pump is overheated, and the like. The term “reduction” as used herein may include stopping the pump. “Reducing” may not include stopping the pump. By reducing the number of rotations of the pump, water flows backward along the flow path, so-called "normal reverse flow" occurs. By reducing the amount of water discharged from the pump for a certain period of time, water flows backward and dust is separated from the water intake port, so that it becomes easier to absorb water again.

The drainage system 200 of the first embodiment may execute any one of the operations 1 to 6 described above, may execute any combination, or may execute all of them. It may be one. The above control can be performed so as to reduce the possibility that the second pump 20 and the third pump 30 will run out of water. That is, it does not necessarily mean that drainage is completely prevented, and it is sufficient if the possibility of drainage is reduced. More specifically, for example, the adjustment may be performed by applying an appropriate water pressure so that a pipe (hose) connecting the pumps is not crushed. By preventing the pipe (hose) from collapsing, more appropriate flow rate control becomes possible.

In the above description, the case where the number of pumps connected in series is two and three has been described, but it will be apparent that the number of pumps that can be connected in series can be similarly expanded to four or more.

The above-described embodiments are described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above-described embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but should be the broadest scope according to the technical idea defined by the claims.

1 Reservoir 10 1st Pump 12 1st Piping 14 1st Cable 20 2nd Pump 22 2nd Piping 24 2nd Cable 30 3rd Pump 32 3rd Piping 34 3rd Cable 50 Electric Motor 51 Water Intake 52 Rotating Blade 53 Drain 54 Rotating shaft 55 Outer wall 56 Flow path 58 Support member 70 Float 80 Control device 90 Power supply device 100 Drainage system 150 Drain pump car 200 Drainage system

Claims (9)

Multiple pumps with submersible motors,
A pipe connecting the plurality of pumps in series,
When the drainage rate is changed by changing the rotation speed of one of the plurality of pumps except when the operation is started and stopped, the drainage rate is changed by changing the rotation speed of the other pump in conjunction with the change. A control device for continuing the operation of the pump while changing the
Drainage system with. When the upstream pump of the plurality of pumps is an upstream pump, and the downstream pump of the upstream pump is a downstream pump,
The control device is configured to make the rate of reducing the drainage amount of the downstream pump equal to or greater than the rate of reducing the drainage amount of the upstream pump during the interlocking except when the operation is started and stopped. Is
The drainage system according to claim 1. When the upstream pump of the plurality of pumps is an upstream pump, and the downstream pump of the upstream pump is a downstream pump,
The control device is configured such that, except when the operation is started and when the operation is stopped, the rate of increasing the drainage of the downstream pump is the same as or smaller than the rate of increasing the drainage of the upstream pump during the interlocking. Is
The drainage system according to claim 1 or 2. When the control device increases the drainage amount of the drainage system except when the operation is started and stopped, the drainage amount is sequentially increased from the upstream pump to the downstream pump among the plurality of pumps. It is configured,
The drainage system according to any one of claims 1 to 3. When the control device reduces the drainage amount of the drainage system except when the operation is started and stopped, the drainage amount is sequentially reduced from the downstream pump to the upstream pump of the plurality of pumps. It is configured,
The drainage system according to any one of claims 1 to 4. The control device, except at the time of operation start and operation stop, at the time of the interlocking, among the plurality of pumps, the drainage rate per hour of the upstream pump is higher than the drainage rate per hour of the downstream pump. It is configured to be larger, and the reduction rate per hour of the upstream pump is smaller than the reduction rate per hour of the downstream pump.
The drainage system according to any one of claims 1 to 5. Among the plurality of pumps, the control device is configured to reduce the drainage amount of all the pumps for a certain period of time when an abnormality occurs in the most upstream pump.
The drainage system according to any one of claims 1 to 6. By using a plurality of pumps provided with a submersible drive motor and piping for connecting the plurality of pumps in series, except when starting and stopping operation, by changing the rotation speed of one of the plurality of pumps. A drainage method, wherein when the amount of drainage is changed, the amount of drainage is changed by changing the number of revolutions of another pump in conjunction with the change, and the operation of the pump is continued. A drainage pump vehicle equipped with the drainage system according to claim 1.

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