JP3532023B2 - Operation method of the preceding standby operation type pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a pre-standby operation type pump, and more specifically, a plurality of pre-standby operation type pumps are installed in the middle of a common water conduit to a drainage pump station. The present invention relates to an operation method of a preceding standby operation type pump applied to a drainage facility to which a running water channel is connected.

[0002]

2. Description of the Related Art In the operation of this type of pre-standby operation type pump, conventionally, generally, a change in the amount of flowing water in a common water conduit is roughly caught by visual inspection and an appropriate number of pumps are started at an appropriate timing. like,
Regardless of the change over time in the amount of water flowing to the drainage pump station, the initial operation (startup) timing and operation (startup) of the preceding standby operation type pump
The current situation is that the manager etc. has appropriately determined the number of vehicles.

[0003]

However, in the drainage system in which a plurality of running water channels are connected in the middle of the common running water channel as described above, the common running water channel is commonly fed from the plurality of running water channels depending on weather conditions. The inflow of rainwater into the waterway fluctuates greatly, and along with this, the amount of water flowing into the drainage pump station also changes significantly with time. Under such conditions, if the operation method with uncertain startup timing and number of startups is adopted as described above, dry operation will continue even if the water level of the suction well at the pumping station falls below the pumping cutoff water level of the pump. Even if a preceding standby operation type pump that precedes the operating state of the pump is used as described above, the occurrence of flood and overload on the pump drive device due to the delay of the pump start timing or the shortage of the number of starting pumps, etc. However, there is a problem in that power consumption is wasted due to an excessive number of start-ups or an unreasonably early start-up of the pump.

The present invention has been made in view of the above circumstances, and it is possible to always start (start) an appropriate number of pumps at an appropriate time in response to a temporal change in the amount of water flowing to a drainage pump station. It is intended to provide a method for operating a standby operation type pump.

[0005]

In order to achieve the above object, the present invention has a plurality of running water channels connected in the middle of a common water channel to a drainage pump station, and a plurality of drainage pump stations are connected to the drainage pump station. A method for operating a preceding standby operation type pump in a drainage facility in which the preceding standby operation type pump is installed,
The flow velocity measuring device is installed at each of the plurality of common water passages spaced apart in the water flow direction, and the amount of flowing water at each of the plurality of positions from the flow velocity measured by the flow velocity measuring device and the arrival time from each of those positions to the drainage station and Is obtained, and based on the correlation curve and the required operation start time of the preceding standby operation type pump, the operation start time and the number of operating pumps of the preceding standby operation type pump installed in the drainage pump station are determined. To do.

That is, according to the present invention, the measured flow velocity, the known cross-sectional area at each measurement point, and each measurement point to the drainage pump station can be measured by simply measuring the flow velocity at a plurality of locations at intervals in the water flow direction of the common headrace. Based on the known distance, the water flow rate at each of the multiple locations and the arrival time from each location to the drainage pump station are obtained, and the correlation curve between the two (water flow rate and arrival time) is also obtained, and the obtained correlation curve and the preceding standby operation By deciding the operation start time and the number of pumps to be operated based on the required operation start time of the type pump, no matter how the water flow to the drainage pump changes with time, the changing water flow can be accommodated. As a result, it becomes possible to always start (start) operation of an appropriate number of pumps at an appropriate time.

In particular, when operating the above-mentioned operation method, the operation start time and the number of operation of the preceding standby operation type pump are
As described in claim 2, an intersection between the correlation curve of the flowing water amount and the arrival time and the required operation start time of the preceding standby operation type pump is obtained, and the number of vehicles obtained by adding 1 to the number of vehicles corresponding to the obtained intersection is calculated. When deciding to start the pumps before the required operation start time, it is possible to start an appropriate number of pumps at an appropriate time in anticipation of an increase in the water level of the suction well at the drainage pump station, which is a waste of power consumption. It is possible to prevent the occurrence of flooding and the overload of the pump drive device, while minimizing the above.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a drainage facility to which the method of the present invention is applied. In FIG. 1, 1 is a drainage pumping station, and in this drainage pumping station 1, a plurality of pre-standby operation type vertical shafts having a configuration described later are provided. A pump P is installed. Reference numeral 2 is a common water conduit to the drainage pump station 1, and a plurality of (three in the drawing, but two or more) running water conduits 3A and 3B are provided in the middle of the common water conduit 2. , 3C
Are connected. In this common headrace 2, a plurality of locations spaced in the water flow direction, preferably each of the above headstocks 3 are provided.
Flow velocity measuring devices 4A, 4B, and 4C are installed immediately upstream of the connection points of A, 3B, and 3C, respectively.

Reference numeral 5 denotes an arithmetic processing unit which receives the measurement signals from the three flow velocity measuring devices 4A, 4B and 4C, that is, the measurement flow velocity V1, V2, V3, and the input measurement flow velocity V1, V2, V3. The above three flow velocity measuring devices 4A,
From the cross-sectional area (known) of the common water conduit 2 at the installation locations of 4B and 4C, the flow rates Q1, Q2, Q3 of the above three locations are calculated, and the distances L1, L2 from these three locations to the drainage pump station 1 are calculated. L3 (known) and the above measurement flow velocity V
The running water arrival times T1, T2, T3 from the above three locations to the drainage pump station 1 are calculated from 1, V2, V3, and the calculated running water quantities Q1, Q2, Q3 and running water arrival times T1, T
2, a correlation curve with T3 (see FIG. 2) is obtained, and further based on the correlation curve and the required operation start time t (time required for pump start + tolerance) of the preceding standby operation type vertical pump P The operation start time and the number of operation of the preceding standby operation type vertical pump P are determined. A controller 6 receives the signals of the operation start time and the number of operating machines, which are output signals from the arithmetic processing unit 5, and controls the operation of the preceding standby operation type vertical shaft pump P in time series.

The running water arrival times T1, T2 and T3 in the arithmetic processing unit 5 are, for example, when the running water quantity is Q3.
Even if calculation is performed with T3 = (L3 / V3), T3 = {(L3-
L2) / V3} + {(L2-L1) / V2} + (L1 /
You may calculate by V1). Further, in determining the operation start time and the number of operating the standby standby type vertical pumps P by the arithmetic processing device 5, the intersection point between the correlation curve shown in FIG. 2 and the required operation start time t is obtained and obtained. Determine the number of operating vehicles by adding 1 to the number of intersections,
In addition, the operation start time is determined so that the determined number of pumps P are started before the required operation start time t.
For example, as shown in FIG. 2, the required operation start time t is Tx.
, The three pumps P are started before Tx.

FIG. 3 is a partial sectional side view showing an example of the construction of the preceding standby operation type vertical shaft pump P.
The impeller 8 is disposed above the lowest water level LWL peculiar to the pump that sucks in air when the depth of the lower end opening of the water absorbing bell mouth 7 is less than this, and impellers that house this impeller 8 One end is open-closed near the lower entrance of the vehicle interior 9, the other end is open to the atmosphere, and an intake pipe 11 having an intake valve 10 interposed is provided in the middle thereof, and the impeller is used when the water level drops. When a predetermined water level is reached between the pumping start water level HWL at the inlet level of the chamber 9 and the pump's lowest water level (pumping cutoff water level) LWL, the intake valve 10
Valve is opened to send air to the inlet of the impeller chamber 9 to switch from pumping operation to air operation, and when the water level rises, the drainage station 1
At the intake well 13 at the inlet level H of the impeller chamber 9
When the WL is reached, the intake valve 10 is closed and the residual air is sucked up to switch from the aerial operation to the pumping operation, and the water level of the suction well 13 is the lowest peculiar to the pump. Even if the water level (pumping cutoff water level) drops below LWL, the pump operation can be continued by switching to the air operation.

Next, a method of operating the vertical shaft pump P in the drainage facility having the above-mentioned structure will be briefly described with reference to the flowchart of FIG. 3 running water channels 3A, 3B, 3
Common headrace 1 with rainwater flowing in from C
The flow velocities V1, V2, V3 at a plurality of locations in the water flow direction are measured by the flow velocity measuring devices 4A, 4B, 4C installed at (step S20), and the measured flow velocities V1, V2, V3 are input to the arithmetic processing unit 5. In this arithmetic processing unit 5, the measured flow velocities V1, V2, V3 that are input, the cross-sectional area (known) of the common water conduit 2 at the installation location of each of the flow velocity measurement apparatuses 4A, 4B, 4C, and the drainage from the three installation locations are performed. Based on the distances L1, L2, L3 (known) to the pumping station 1, the flowing water amounts Q1, Q2, Q3 at each location and the flowing water arrival times T1, T2, T3 from each location to the drainage pumping station 1 are calculated (steps). Along with S21), the calculated flowing water amounts Q1, Q2, Q3 and flowing water arrival times T1, T2, T
A correlation curve as shown in FIG. 2 is created by 3 and 3 (step S22).

Next, the intersection between the correlation curve shown in FIG. 2 and the required operation start time t of the vertical standby type vertical pump P is determined (step S23), and the number of units n corresponding to the determined intersection is how many. If n <1, one pump P is selected. If 1 <n <2, two pumps P are selected.
When <n <3, the number of operating pumps N is determined by adding 1 to the number of pumps n corresponding to the intersection, such as three pumps P, and the determined number of pumps P is set to the running water arrival time. An operation start time is determined such that the operation is started before T1, T2, T3 reach the required operation start time t (steps S24 to S26).

The signals of the operating number N and the operation start time determined by the arithmetic processing unit 5 are sent to the controller 6
Then, the determined number N of the preceding standby operation type vertical shaft pumps P are started (started) at predetermined operation start times (steps S27 to 29).

In the above-described embodiment, the example applied to the vertical shaft pump P has been described, but it is needless to say that the present invention may be applied to other pumps capable of performing the preceding standby operation. . Further, the number of flow velocity measuring devices to be installed is not limited to three, and the number of flow velocity measuring devices corresponding to the number of flow channels connected to the common water channel 2 may be installed.

[0016]

As described above, according to the present invention, the measured flow velocity and the known cross-sectional area at each measurement point can be obtained only by measuring the flow velocity at a plurality of locations at intervals in the water flow direction of the common water conduit. It is possible to obtain the correlation curve between the flow rate at each of the multiple locations and the arrival time from each location to the drainage pump station based on the known distance from each measurement point to the drainage pump station. By deciding the pump start time and the number of pumps to be operated based on the required start time of the operation, no matter how the water flow to the drainage pump changes with time, it will be possible to respond to the changing water flow. It is possible to always start (start) operation of an appropriate number of pumps at an appropriate time. This can prevent flooding and overloading of the pump drive device due to delays in pump start-up timing, insufficient start-up number, etc., as well as unreasonable premature pump start-up times or excessive start-up numbers. There is an effect that it is possible to realize a safe and economical pump operation as a whole by eliminating waste of power consumption due to.

Particularly, in the operation of the above-mentioned operating method, the operation start time and the number of operating pumps of the preceding standby operation type pump are as described in claim 2, and the correlation curve of the flowing water amount and the arrival time and the preceding standby operation type pump are If it is decided to start the pumps of the number corresponding to the intersection with the required operation start time of 1 by 1 before the required operation start time, it is possible to increase the water level of the water intake well at the drainage pump station at an appropriate time. Therefore, it is possible to start an appropriate number of pumps, and it is possible to surely prevent the occurrence of flood and the overload of the pump drive device while minimizing the waste of power consumption.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a drainage facility to which the method of the present invention is applied.

FIG. 2 is a diagram illustrating a correlation curve between the amount of flowing water to the drainage pump station and the flowing water arrival time.

FIG. 3 is a partial cross-sectional side view showing a configuration example of a preceding standby operation type vertical pump.

FIG. 4 is a flowchart illustrating a method of operating a vertical shaft pump in drainage equipment.

[Explanation of symbols]

1 Drainage station 2 common headrace 3A, 3B, 3C Runway 4A, 4B, 4C Flow velocity measuring device P Leading standby operation type vertical shaft pump

Claims (2)

(57) [Claims] 1. A plurality of running waterways are connected in the middle of a common waterway to a drainage pumping station, and a plurality of preceding standby operation type pumps are installed at the drainage pumping station. A method for operating an operation type pump, wherein flow velocity measuring devices are installed at a plurality of locations at intervals in the water flow direction in the common water conduit, and the flow rates of the above multiple locations and Calculate the correlation curve with the arrival time from each location to the drainage pump station, and based on the correlation curve and the required operation start time of the preceding standby operation type pump, the operation start time of the preceding standby operation type pump installed at the drainage pump station And a method for operating a preceding standby operation type pump, characterized in that the number of operating pumps is determined. 2. The operation start time and the number of operating pumps of the preceding standby operation type pump are obtained by obtaining an intersection point between the correlation curve and the required operation start time of the preceding standby operation type pump, and 1 is the number of vehicles corresponding to the obtained intersection point. The method of operating the preceding standby operation type pump according to claim 1, wherein the number of pumps added with is determined to be started before the required operation start time.