JP2021193301A - Manhole pump system - Google Patents

Abstract

To provide a manhole pump system which can effectively suppress a power consumption amount by being operated by controlling the activation and a stop of a pump by effectively using a capacity of pump equipment.SOLUTION: In a manhole pump system having a pump control device for activating a pump when a water level of a water storage tank reaches an activation water level, and stopping the pump when the water level reaches a stop water level thereafter, the pump control device is constituted so as to be settable in a first stop water level which reaches an effective storage water depth lower end water level, and a second stop water level which is set at an activation water level side with the first stop water level as a reference on the basis of a power consumption amount per unit water supply amount of the pump as the stop water level, and also settable in either of the first stop water level and the second water stop level as the stop water level with a rise speed of an average water level within a prescribed time with respect to the water storage tank as an index.SELECTED DRAWING: Figure 3

Description

The present invention relates to a manhole pump system.

In the manhole pump system that transports sewage to a sewage treatment facility, a plurality of manhole pump devices are installed along the sewage transport path. The manhole pump device measures the water level of the manhole that stores the sewage that has flowed in from the inflow pipe at the end of the sewage transport pipe, the submersible pump that pumps the sewage stored in the manhole to the outflow pipe, and the sewage stored in the manhole. It is equipped with a water level sensor.

In such a manhole pump device, a control unit that starts the submersible pump when the water level measured by the water level sensor reaches a predetermined pump start water level and stops the submersible pump when the pump stop water level lower than the pump start water level is reached. Is equipped with.

Since the submersible pump installed in the manhole aims to drain the maximum inflow of sewage, a model with a large capacity is selected, so it is operated with a high lift and a small amount of water on the pump performance curve. In some cases.

The submersible pump started at the pump start water level pumps sewage into the outflow pipe, and as the water level drops, the pumping head increases and the amount of pumped water decreases. In other words, as the pump stop water level approaches a certain level, the efficiency gradually deteriorates, and the operation shifts to the region of high lift and small amount of water.

Japanese Unexamined Patent Publication No. 2006-057567

Since drainage facilities such as manhole pumps are designed based on the planned drainage amount set in advance, the actual drainage amount will be higher than the planned drainage amount in the middle stage until the population density etc. reaches the presumed scale. In such a situation, if the pump is pumped to a constant pump stop water level, the operation will be inefficient and include areas with high heads, and there is a problem that the power consumption per unit water displacement will increase. rice field.

In addition, after the population density reaches a pre-estimated scale, the actual amount of wastewater may be less than the planned amount of wastewater due to population decline, etc., and even in such a case, the pump is always stopped. When pumping to the water level, there is a problem that the amount of power consumption per unit amount of water is increased.

In view of the above-mentioned problems, an object of the present invention is a manhole capable of effectively suppressing power consumption by effectively utilizing the capacity of the pump equipment and controlling the start and stop of the pump for operation. The point is to provide a pump system.

To achieve the above object, a first characteristic feature of the manhole pump system according to the present invention is to start the pump when the water level of savings aquarium is activated water level, the pump controller to stop the pump and then come to a halt water level a manhole pump system wherein the pump control device, the as a stop level, the effective reservoir depth lower first and stop level serving as the water level, the first based on the power consumption amount per unit water amount of the pump second stop level, which is set to the start water level side with respect to the stop level is configured to be set, using as an index the average level rise rate in a predetermined time for said reservoir, the said first stop level The point is that any one of the second stop water levels is configured to be set to the stop water level.

There is a correlation between the increase / decrease in the amount of inflow or outflow to each manhole arranged along the route for transporting sewage to the sewage treatment facility, and the tendency of increase / decrease in sewage generated on the upstream side is transmitted to the downstream side. For example, when the rising speed of the average water level within a predetermined time for each water storage tank is high, the first stop water level is set to the stop water level and each pump is driven to avoid frequent pump start-ups. If the average water level rise rate for each water tank within a predetermined time is low, the second stop water level set on the start water level side based on the first stop water level is set as the stop water level for each pump. Can be operated in a region where the amount of power consumption per unit water supply is low. In this way, the power consumption of the entire system can be effectively suppressed.

The second feature structure, start the pump when the water level of savings aquarium is activated water, then stop the pump to be a stop level, provided with a pump control device a maximum start frequency is defined at a given time a manhole pump system, the pump controller, as the stop level, the effective reservoir depth lower first and stop level serving as the water level, the first stop level based on the power consumption amount per unit water amount of the pump The second stop water level set on the start water level side can be set with reference to, and either the first stop water level or the second stop water level is set using the start frequency of the pump per predetermined time as an index. One of them is configured to be set to the stop water level.

The maximum starting frequency of the pump installed in the water storage facility is set in a predetermined time. However, there is a margin in the activation frequency except when the amount of inflow or outflow to the water tank is maximum. Therefore, based on the start frequency per predetermined time, the second stop water level set on the start water level side based on the first stop water level is set to the stop water level to drive the pump, and the power consumption per unit water supply amount is increased. Power consumption can be suppressed by operating in a region where the amount is low.

The third feature configuration is that, in addition to the first or second feature configuration described above, the index is calculated by adding preset date and time information.

For example, in a residential area, water usage increases in the morning and evening, and in a factory area, water usage increases in the daytime, depending on the time of day, or on a weekday (weekdays). A characteristic pattern can be seen depending on the weekend. If the index is calculated in consideration of such a characteristic pattern, it becomes possible to reduce the power consumption more realistically.

The fourth characterizing feature of, in addition from the first described above in the third one characteristic feature of the, between manholes pump device which is placed along the conveyance path, a second downstream manhole pump device The second stop water level of the downstream manhole pump device so that the water storage capacity between the stop water level and the start water level is equal to or less than the water storage capacity between the second stop water level and the start water level of the upstream manhole pump device. Is set.

When the second stop water level is set to the stop water level, the water storage capacity between the second stop water level and the start water level of the upstream manhole pump device flows into the downstream manhole pump device at once by the upstream pump. It becomes the amount of water to be pumped. In such a case, the second stop water level of the manhole pump device on the flow side is set so that the water storage capacity between the second stop water level and the start water level of the manhole pump device on the downstream side of the water volume is equal to or less than the same level. If so, the manhole pump on the downstream side can be operated in a region where the power consumption per unit water supply amount is low. For example, if the cross-sectional area of each water tank of the adjacent manhole pump device is the same, the second stop water level of the downstream manhole pump device is equal to or equal to the second stop water level of the upstream manhole pump device. It may be set to the above high level.

The fifth characterizing feature of the from the first upper mentioned in addition to the fourth one of characteristic structure of the pump control device becomes higher than the start frequency of start frequency of the pump is set in advance, the second 2 The point is that it is configured to change and set the stop water level to a low level.

Depending on the starting frequency of the pump per predetermined time, it may be difficult to continue operation at the fixed value of the second stop water level, but the second stop water level set at that time is based on the first stop water level. If it is variably set to the first stop water level side based on the index, it becomes possible to reduce the power consumption more flexibly.

The sixth characterizing feature of from the first upper mentioned in addition to the fifth one of characteristic structure of the pump control apparatus of the manhole a pump device installed in the downstream side along the conveyance path, the reservoir When the water level reaches the starting water level, a start command is output to the pump control device of the upstream manhole pump device, and the pump is started after confirming that the pump of the upstream manhole pump device has been started. There is a point.

When the water level in the water tank of the downstream manhole pump device reaches the starting water level, a start command is output to the pump control device of the upstream manhole pump device before starting the pump, and sewage flows in from the upstream manhole pump device. By starting the pump after waiting for it to be done, it becomes possible to earn operating time in a region where the amount of power consumption per unit amount of water is low.

The seventh characterizing feature of, in addition to the sixth characteristic feature of the above mentioned, the pump control apparatus of the manhole a pump device installed in the downstream side along the conveyance path, the pump control of the upstream manhole pump device The point is that the pump is started without confirming the start of the pump of the manhole pump device on the upstream side when a predetermined time elapses after the start command is output to the device.

If the water level in the water tank of the downstream manhole pump device rises while waiting for the inflow of sewage from the upstream manhole pump device, the sewage may overflow. Such a situation can be avoided by starting the pump after a predetermined time elapses after outputting the start command to the pump control device of the manhole pump device on the upstream side.

The eighth characterizing feature of from the first upper mentioned in addition to the fifth one of characteristic structure of the pump control apparatus of the manhole a pump device installed in the downstream side along the conveyance path, the reservoir The point is that the pump is configured to start after a predetermined time has elapsed when the water level reaches the starting water level.

Even if the water level of the water tank reaches the starting water level, the sewage does not immediately overflow from the water tank to an abnormally high water level, and there is usually some margin. Therefore, even if the water level of the water tank reaches the starting water level, by starting the pump after waiting for a predetermined time, it becomes possible to earn an operating time in a region where the power consumption per unit water supply amount is low.

The ninth characterizing feature of from the first upper mentioned in addition to the eighth one feature structure of the pump control device, the water level of the reservoir is to start water level, the stop on the basis of the index Even if the water level is set to the second stop water level, if a predetermined condition is satisfied, the scum discharge control for setting the stop water level to the first stop water level is executed regardless of the index. It is in.

If the operation is continued with the stop water level set to the second stop water level on the start water level side of the first stop water level, sewage continuously stays in the water tank, scum is generated and grows, and a foul odor is generated. There is a risk of deteriorating the environment of the water tank, such as occurrence or clogging of the water pipe. In preparation for such a case, even if the stop water level is set to the second stop water level based on the index, by forcibly setting the stop water level to the first stop water level, the scum is transported to the downstream side together with the sewage, and the environment deteriorates. Can be prevented.

Wherein configuration of the tenth, in addition to the ninth characterizing feature described above, the a predetermined condition is time information, that is set to a time later as a manhole pump device on the downstream side along the conveyance path It is in.

Even if the stop water level is set to the second stop water level based on the index, the scum is transported to the downstream side together with the sewage by forcibly setting the stop water level to the first stop water level at a predetermined time. By setting the predetermined time to a later time as the manhole pump device on the downstream side is set, the scum can be transported from the upstream side to the downstream side along the sewage transport path without delay.

The eleventh characterizing feature, in addition to the ninth characterizing feature of the above mentioned, lies in the predetermined condition is confirmed scum discharge command transmitted from the pump controller manhole pump equipment on the upstream side ..

The pump control device of the manhole pump equipment on the downstream side that received the scum discharge command from the pump control device of the manhole pump equipment on the upstream side executes the scum discharge control that sets the stop water level to the first stop water level. The scum discharge control is executed in order, and the scum is transported from the upstream side to the downstream side along the sewage transport path without stagnation.

In the twelfth characteristic configuration, in addition to any of the above-mentioned first to eleventh characteristic configurations, the pump control device has the first starting water level and the unit feed of the pump as the starting water level. The second start water level set on the side opposite to the stop water level is configured to be configurable based on the power consumption per water amount with respect to the first start water level, and the first start water level is set based on the index. The point is that either the water level or the second starting water level is configured to be set to the starting water level.

If the starting water level is set as described above, it is possible to operate in a region where the power consumption per unit water supply amount is low, and it is possible to further effectively reduce the power consumption.

As described above, according to the present invention, according to the present invention, a manhole pump capable of effectively suppressing power consumption by effectively utilizing the capacity of the pump equipment and controlling the start and stop of the pump for operation. It became possible to provide a system.

Explanatory drawing of manhole pump system to which this invention is applied Explanatory drawing of manhole pump apparatus used in this invention Explanatory drawing of pump control device Flowchart showing how to operate the pump Explanatory diagram of simulation results

The manhole pump system according to the present invention, the pump control device incorporated in the manhole pump system, and the pump operation method will be described below.

As shown in FIGS. 1 and 2, a manhole pump according to the present invention is provided by a plurality of manhole pump devices 10 (10-1 to 10-n) arranged at predetermined intervals along a sewage pipe buried in the ground. The system 100 is configured. n is the number of facilities, and one group is composed of a dozen to dozens of facilities. Then, a plurality of groups are constructed along the route of the sewage pipe arranged toward the sewage treatment plant.

Each manhole pump device 10 includes a manhole 11 as a water storage tank for storing sewage flowing from the inflow pipe 12, and two submersible pumps for pumping the sewage stored in the manhole 11 to the outflow pipe 14 via a rising pipe 13. 20 and a water level sensor 15 for measuring the water level of sewage stored in the manhole 11.

An injection pressure type or bubble type water level sensor is used as the water level sensor 15, and is installed at the bottom of the manhole 11 so as to continuously detect the water level of sewage stored in the manhole 11. Further, a float-type water level sensor 16 for backup is installed at a height at which the water level sensor 15 becomes abnormally high in preparation for a failure of the water level sensor 15, and the water level sensor 15 and the water level sensor 16 are configured to detect the abnormally high water level HHWL. ing. A floating water level sensor may be used as the water level sensor, and the water level may be measured by another known water level sensor, such as detecting the water level every time the water level reaches a predetermined level.

A control panel 50 provided with a control device 51 for controlling the start / stop of the submersible pump 20 is provided near the ground of each manhole pump device 10. A feeder line 57 for supplying power to the electric motor 30 incorporated in the submersible pump 20 is wired between the control device 51 and the submersible pump 20, and a water level detection signal line 58 is wired between the control device 51 and the water level sensor 15. ing.

As shown in FIG. 3, the control device 51 stores and works on a microcomputer 52 that functions as a control unit (hereinafter, also referred to as a “control unit 52”) and a control program executed by the microcomputer 52. A memory 53 used as an area and a pump drive circuit 54 controlled by a microcomputer 52 are provided.

Further, by inputting a monitor signal output from the microcomputer 52, the state of the manhole pump device 10 can be connected to the external remote management device 56 or another manhole pump device 10 via the Wi-Fi or a mobile phone network. It is equipped with a communication unit 55 and the like.

Specifically, it relates to the start time of the pump, the number of start times per day, the presence or absence of an abnormally high water level, and an abnormal state such as abnormal heating detected by a sensor provided in the pump, which is grasped by the control unit 52. Information, as well as setting information of the pump start water level and the pump stop water level and time information thereof shown below are transmitted to the remote management device 56 via the communication unit 55.

The control unit 52 controls the pump drive circuit 54 based on the water level measured by the water level sensor 15 to start and control the electric motor 30 of the submersible pump 20. For example, when the pump drive circuit 54 is an inverter circuit, the rotational speed of the electric motor 30 is controlled, when the pump drive circuit 5 4 is constituted by a relay circuit for feeding the power supply to the motor 30 The state is controlled.

When the water level sensor 15 detects that the stored water amount has reached the pump starting water level HWL, the control unit 52 starts the motor 30 (hereinafter, also referred to as "starting the submersible pump") and the downstream side of the sewage by the submersible pump 20. When the pump stop water level LWL is measured after the pump stop water level LWL is measured, that is, after the time required to pump the amount of water corresponding to the water level from the stop water level LWL to the vicinity of the suction port 24 has elapsed, the motor 30 is stopped and the discharge of sewage by the submersible pump 20 is stopped.

As shown in FIG. 2, the control unit 52 sets the stop water level LWL as the start water level HWL side with reference to the first stop water level LWL1 and the first stop water level LWL1 set at the lower end water level of the effective storage water depth of the manhole facility. The second stop water level LWL2 set on the high water level side is configured to be configurable, and either the first stop water level LWL1 or the second stop water level LWL2 is set using the inflow water amount or the outflow water amount per predetermined time for the manhole 11 as an index. One is configured to set the stop water level LWL.

Further, the control unit 52 sets the starting water level HWL as the second starting water level HWL2 set on the opposite side of the stop water level LWL, that is, on the high water level side with reference to the first starting water level HWL1 and the first starting water level HWL1. It is configured to be possible, and based on the index, either one of the first starting water level HWL1 and the second starting water level HWL2 is set to the starting water level HWL.

For example, when the amount of inflow or outflow to the manhole 11 per predetermined time is large, the submersible pump 20 is driven by setting the first stop water level LWL1 to the stop water level LWL to avoid frequent pump start. When the amount of inflow or outflow to the manhole 11 per predetermined time is small, the second stop water level LWL2 set on the start water level HWL side with reference to the first stop water level LWL1 is set to the stop water level LWL. Drives the submersible pump 20. The latter control makes it possible to avoid operation in a region where the power consumption per unit water supply amount is high and suppress the power consumption amount.

By configuring the start water level HWL to be switchable between the above-mentioned first start water level HWL1 and the second start water level HWL2 set on the opposite side of the stop water level LWL with reference to the first start water level HWL1. It is possible to operate in a region where the power consumption per unit water supply amount is low, and it is possible to further effectively reduce the power consumption. At least, the stop water level may be switchable.

The index for setting the stop water level LWL and the start water level HWL is the amount of inflow water per predetermined time for the manhole 11, and when the amount of inflow water per predetermined time is large, the first is to avoid frequent start and stop of the pump. The stop water level LWL is set in the 1 stop water level LWL1, and the start water level HWL is set in the first start water level HWL1 in order to avoid overflow.

On the contrary, when the inflow water amount per predetermined time is small, the consumption per unit water supply amount is avoided in order to avoid the operation in the region where the lift is large and the water level is low, that is, the power consumption amount per unit water supply amount is high. The stop water level LWL is set in the second stop water level LWL2 having a low electric energy amount, and the start water level HWL is set in the second start water level HWL1.

The amount of inflow water per predetermined time can be determined based on the latest rising speed of the water level measured by the water level sensor 15 when the submersible pump 20 is stopped. It can be determined based on the ascending speed, and the index may be calculated in consideration of the latest operating time of the submersible pump 20.

In the latter case, if the operating time of the submersible pump 20 from the starting water level HWL to the stopped water level LWL is long, it can be determined that the amount of inflow water per predetermined time is large, and the period from the starting water level HWL to the stopped water level LWL is reached. If the operating time of the submersible pump 20 is short, it can be determined that the amount of inflow water per predetermined time is small.

By monitoring the latest water level fluctuation or the latest operating time of the pump, the required amount of water sent by the pump at that time can be known, so by learning the situation based on such information and setting the appropriate stop water level. At that time, it becomes possible to operate in which the power consumption can be reduced while maintaining the required predetermined amount of water supply.

Further, it is preferable to calculate a specific numerical value of the inflow water amount per predetermined time and use it as an index based on the amount of electric power required for the outflow of the unit water amount to the manhole 11. By setting such an index, the pump can be operated in a region where the amount of electric power required for the outflow of a unit amount of water is further lowered.

Further, the index may be calculated by adding the preset date and time information. For example, in a residential area, water usage increases in the morning and evening, and in a factory area, water usage increases in the daytime, depending on the time of day, or on a weekday (weekdays). A characteristic pattern can be seen depending on the weekend. If the index is calculated in consideration of such a characteristic pattern, it becomes possible to reduce the power consumption more realistically.

Since such date and time information differs depending on the region, the individual date and time information may be wirelessly transmitted from the remote management device 56 to the communication unit 55 of each manhole pump device 10 and stored in the memory 53. preferable.

It is preferable that the second stop water level LWL2 and / or the second start water level HWL2 are configured to be variably set based on the index, and it is possible to flexibly respond to fluctuations in the inflow water amount and further reduce power consumption. It will be possible. For example, when the amount of inflow water per predetermined time is extremely small, the power consumption can be further reduced by setting the second stop water level LWL2 and / or the second start water level HWL2 higher.

Further, the submersible pump 20 is operated a predetermined number of times with the first stop water level LWL1 set to be equal to or lower than the effective storage water depth lower end water level of the manhole facility and the second stop water level LWL2 is set to the stop water level LWL, and / or a predetermined time elapses. Then, it is preferable that the first stop water level LWL1 is set to the stop water level LWL at least once to operate the submersible pump 20.

In the manhole pump device 10, organic substances such as kitchen debris and oils and fats mixed in the inflow water to the water tank are suspended on the water surface to generate scum formed into a film, which causes an offensive odor to be generated inside. Even in such a case, the pump is operated a predetermined number of times with the first stop water level LWL1 set to the lower end water level of the effective storage water depth of the manhole facility and the second stop water level LWL2 above it set to the stop water level. / Or, when the stop water level LWL is set to the first stop water level LWL1 and the pump is operated after a predetermined time has elapsed, the scum accumulated in the manhole 11 is drained by the submersible pump 20 to purify the inside of the manhole 11. Will be.

Further, it is preferable that the starting water level HWL and the second stop water level LWL2 are set so as to satisfy the preset minimum starting time interval of the submersible pump 20.

If the start-up time interval of the pump is short, the power consumption increases due to frequent start-up, and the electric motor of the pump generates heat, which may shorten the life of the electric motor, that is, the pump. However, by appropriately setting the starting water level and the second stop water level, it is possible to satisfy the preset minimum starting time interval of the pump, and it becomes possible to avoid the occurrence of the above-mentioned inconvenient situation.

As shown in FIG. 5, the pump needs to be a pump having a characteristic that the amount of electric power required to discharge a unit amount of water decreases as the amount of discharge per unit time increases in the range of use.

Based on the flowchart shown in FIG. 4, a pump operation method executed by the control unit 52 of the pump having characteristics similar to those in FIG. 5 will be described.
When the control unit 52 reads an index from the memory 53 (S1) and determines that the value is lower than the preset threshold value, that is, the inflow amount per unit time is small (S2), the start water level is set to HWL2 and stopped. When the water level is set to LWL2 (S3) and it is determined that the inflow amount per unit time is large (S2), the starting water level is set to HWL1 and the stopping water level is set to LWL1 (S11).

When the start water level is set to HWL2, the stop water level is set to LWL2 (S3), and the water level of the manhole 11 becomes the start water level HWL2 or higher (S4), the pump is started and the pump start counter is incremented (S5). The value of the pump start counter is initially set to 0 and is incremented by 1 each time it is started.

When the value of the pump start counter is less than the preset threshold value N (N = 6 in this embodiment) (S6), the pump is driven until the water level drops with reference to the stop water level LWL2 (S8), and the threshold value N is reached. Then, it is driven until the water level drops with reference to the stop water level LWL1. When the water level falls below the stop water level LWL1 (S7), the value of the pump start counter is reset to 0 (S9), and the submersible pump 20 starts after a predetermined time has elapsed. It is stopped (S10).

That is, the pump is stopped until the value of the pump start counter reaches N = 6, the pump is stopped when the water level reaches LWL2, the water level stops when the value of the pump start counter reaches N = 6, and the pump is stopped when the water level reaches LWL1. .. As a result, the scum accumulated in the manhole 11 is crushed and pumped to the downstream side together with the sewage.

When the start water level is set to HWL1 and the stop water level is set to LWL1 in step S11, when the water level of the manhole 11 becomes the start water level HWL1 or higher (S12), the pump is started (S13), and the water level becomes the stop water level LWL1 or less. (S14), the submersible pump 20 is stopped after a predetermined time has elapsed (S15).

That is, the manhole pump system 100 according to the present invention includes a pump control device 51 that starts the pump when the water level of the water storage tank detected by the water level sensor 15 reaches the starting water level HWL and then stops the pump 20 when the stopped water level LWL is reached. and a manhole pumping system for transporting a plurality of manhole pump device 10 the sewage to sewage treatment plants, the pump control unit 5 1, as the stop level LWL, the first stop level LWL1, the unit water amount per pump 20 The second stop water level LWL2 set on the start water level HWL side with reference to the first stop water level LWL1 is configured to be configurable based on the power consumption of the pump, and the inflow water amount or outflow water amount per predetermined time to the water storage tank is used as an index. Then, either one of the first stop water level LWL1 and the second stop water level LWL2 is set to the stop water level LWL.

Each pump controller 5 1, based on the most recent level change measured by the water level sensor 15, or based on the most recent operating time of the pump 20, is configured to set the second stop level LWL2 There is.

In the manhole pump system 100, there is a correlation between the increase / decrease in the amount of inflow or outflow to each manhole arranged along the route for transporting sewage to the sewage treatment facility, and the increase / decrease in sewage generated in the manhole pump device 10 on the upstream side. The tendency is transmitted to the manhole pump device 10 on the downstream side.

Therefore, when the inflow water amount or the outflow water amount per predetermined time for each water tank is small, the plurality of manhole pump devices 10 constituting the manhole pump system 100 are both set to the start water level side with the first stop water level LWL1 as a reference. By setting the second stop water level LWL2 to the stop water level LWL and driving each pump 20, it is possible to operate in a region where the power consumption per unit water supply amount is low.

Similarly, when the inflow or outflow amount per predetermined time for each water tank is small, the plurality of manhole pump devices 10 constituting the manhole pump system 100 both set the second starting water level HWL2 to the starting water level HWL. By driving each pump 20, it is possible to operate in a region where the power consumption per unit water supply amount is low. In this way, the power consumption of the entire system can be effectively suppressed.

Further, when the amount of inflow water or the amount of outflow water per predetermined time for each water tank is large, the plurality of manhole pump devices 10 constituting the manhole pump system 100 both set the first stop water level LWL1 to the stop water level LWL, and also set the first stop water level LWL1 to the stop water level LWL. By setting the first starting water level HWL1 to the starting water level HWL and driving each pump 20, it is possible to avoid the occurrence of overheating abnormality of the pump due to the occurrence of frequent pump starting.

When the capacity of the water tanks is equal between the adjacent manhole pump devices 10, that is, when the cross-sectional areas of the water tanks are the same, the second stop water level LWL2 of the manhole pump device on the downstream side is the second stop water level LWL2 of the manhole pump device on the upstream side. 2 It is preferable that the stop water level is set to LWL2 or higher, and the manhole pump on the downstream side can be operated in a region where the power consumption per unit water supply amount is low.

Normally, the capacity of the water storage tank of the manhole pump device 10 arranged along the sewage transfer path is set to be larger on the most downstream side than on the most upstream side, but the capacity of the water storage tank is set between adjacent manhole devices. The same applies even if the water levels are different, and the water storage capacity between the second stop water level LWL2 and the start water level HWL of the downstream manhole pump device 10 is different between the manhole pump devices 10 arranged adjacent to each other along the sewage transfer path. It is preferable that the second stop water level LWL2 of the downstream manhole pump device is set so as to be equal to or less than the water storage capacity between the second stop water level LWL2 of the upstream manhole pump device 10 and the start water level HWL. ..

Further, when the start frequency of the pump 20 becomes higher than the preset start frequency, the control unit 52 of each pump control device 51 changes and sets the second stop water level LWL2 to a lower level, that is, to the first stop water level LWL1 side. It is preferable that it is configured as such.

Depending on the starting frequency of the pump per predetermined time, it may be difficult to continue operation at the fixed value of the second stop water level, but the second stop water level set at that time is based on the first stop water level. If it is variably set to the first stop water level side based on the index, it becomes possible to reduce the power consumption more flexibly.

Hereinafter, another embodiment of the manhole pump system 100 will be described.
The pump control device 51 (52) of the manhole pump device 10 installed on the downstream side along the sewage transport path is a pump control device 51 (52) of the manhole pump device 10 on the upstream side when the water level of the water tank reaches the starting water level HWL. It may be configured to output a start command to 52) and start the pump after confirming that the pump 20 of the manhole pump device 10 on the upstream side has been started.

For example, the communication units 55 of the manhole pump devices 10 on the upstream side and the downstream side may be configured to communicate with each other. Alternatively, the upstream side and downstream side manhole pump devices 10 may communicate with each other via the remote control device 56. In this case, for example, when the remote management device 56 receives the signal of the start water level HWL of the downstream side manhole pump device 10, it outputs a start command to the upstream side manhole pump device 10, and then outputs a start command to the upstream side manhole pump device 10. When the start signal of 20 is received, the start confirmation signal may be transmitted to the manhole pump device 10 on the downstream side.

In the above description, an example in which the communication unit 55 is a communication unit 55 capable of connecting to the Internet via Wi-Fi or a mobile phone line network has been described, but communication is performed by another wireless communication device such as a low power wireless device. The unit 55 may be configured. The upstream side and downstream side manhole pump devices 10 refer to two manhole pump devices 10 adjacent to each other along a sewage transport path.

With this configuration, when the water level in the water tank of the manhole pump device 10 on the downstream side reaches the starting water level HWL, the pump control device 51 (52) of the manhole pump device 10 on the upstream side is started before starting the pump 20. By outputting a command and starting the pump after waiting for sewage to flow in from the manhole pump device 10 on the upstream side, it is possible to earn operating time in a region where the power consumption per unit water supply amount is low. Become.

Further, the pump control device 51 (52) of the manhole pump device 10 installed on the downstream side along the sewage transport path outputs a start command to the pump control device 51 (52) of the manhole pump device 10 on the upstream side. After that, when a predetermined time elapses, the pump 20 may be started without confirming the response from the pump control device 51 (52) of the manhole pump device 10 on the upstream side.

If the water level in the water tank of the manhole pump device 10 on the downstream side rises while waiting for the inflow of sewage from the manhole pump device 10 on the upstream side, the sewage may overflow. After outputting a start command to the pump control device 51 (52) of the manhole pump device 10 on the upstream side, the pump is started after a predetermined time has elapsed, so that the water level in the water tank reaches an abnormally high water level HHWL downstream. Water can be sent to the side. Even with such a configuration, it becomes possible to earn operating time in a region where the power consumption per unit water supply amount is low.

Further, the pump control device 51 (52) of the manhole pump device 10 installed on the downstream side along the sewage transport path controls the pump of the manhole pump device 10 on the upstream side when the water level of the water tank reaches the starting water level HWL. The pump may be started after a predetermined time has elapsed without outputting a start command to the device 51 (52).

Even if the water level of the water tank becomes the starting water level HWL, the sewage does not immediately overflow from the water tank to the abnormally high water level HHWL, and usually there is some margin. Therefore, even if the water level of the water tank reaches the starting water level, by starting the pump after waiting for a predetermined time, it becomes possible to earn an operating time in a region where the power consumption per unit water supply amount is low.

By the way, if the operation is continued with the stop water level set to the second stop water level LWL2 on the start water level HWL side of the first stop water level LWL1, sewage continuously stays in the water tank and scum occurs. There is a risk that it will grow and worsen the environment of the water tank, such as the generation of foul odors and clogging of water pipes. In preparation for such a case, even if the stop water level is set to the second stop water level based on the index (inflow water amount or outflow water amount per predetermined time), by forcibly setting it to the first stop water level together with sewage. The scum is transported to the downstream side, and deterioration of the environment can be prevented.

Specifically, in the pump control device 51 (52), even if the water level of the water tank becomes the starting water level HWL and the stop water level is set to the second stop water level LWL2 based on the above-mentioned index, the predetermined condition is satisfied. , Regardless of the index, it may be configured to execute the scum discharge control for setting the stop water level to the first stop water level LWL1.

Predetermined conditions may be used as time information, and the time may be set later as the manhole pump device on the downstream side along the sewage transport path. Even if the stop water level is set to the second stop water level based on the index, the scum is transported to the downstream side together with the sewage by forcibly setting the stop water level to the first stop water level at a predetermined time. By setting the predetermined time to a later time as the manhole pump device on the downstream side is set, the scum can be transported from the upstream side to the downstream side along the sewage transport path without delay.

Further, a predetermined condition may be used as confirmation of a scum discharge command transmitted from a pump control device of a manhole pump facility on the upstream side. The pump control device of the manhole pump equipment on the downstream side that received the scum discharge command from the pump control device of the manhole pump equipment on the upstream side executes the scum discharge control that sets the stop water level to the first stop water level. The scum discharge control is executed in order, and the scum is transported from the upstream side to the downstream side along the sewage transport path without stagnation.

The scum discharge command may be configured to communicate with each other between the communication unit 55 of each manhole pump device 10 on the upstream side and the downstream side, or the manhole pump device 10 on the upstream side and the downstream side may be a remote management device. It may be configured to communicate via 56.

If the first stop water level is set to be equal to or lower than the water level at the lower end of the effective storage water depth of the manhole equipment, the scum will be effectively discharged during the scum discharge operation.

The simulation result of the power consumption of the pump will be described with reference to FIG.
FIG. 5 shows the characteristic lines of the total head, efficiency, and shaft power of the manhole pump. The range of total head 9m to 4m was divided into 5 sections A to E at 1m intervals, the median head of each section was taken as the average head, and the discharge amount and shaft power for the average head were extracted in the table. Then, the 1 m discharge electric energy (power consumption per unit water supply amount) at that time was calculated.

Here, the amount of 1 m discharge power is the amount of power consumed to discharge 1 m in height, assuming a water tank having the same cross section. Since the tanks have the same cross-sectional area, the amount of water discharged for a height of 1 m is always the same.

For example, when discharging 10 m of lift, if it is set to operate in sections B and A (lift 2 m), if the sections B and A are operated 5 times, (2.58 + 3.36) x 5 = 29. A power amount of .7 kWmin = 0.495 kWh (100%) will be required.

When only the section B (lift 1 m) is operated 10 times, 2.58 × 10 = 25.8 kWmin = 0.43 kWh (86.9%), which shows that the reduction of power consumption can be achieved.

When only section B (lift 1 m) is operated eight times and then sections A and B (lift 2 m) are operated once, 2.58 × 9 + 3.36 = 26.58 kWmin = 0.443 kWh (89.5%). Scum can be removed by operating sections B and A while achieving low power consumption.

It can be seen that low power consumption can be achieved by the same simulation for the sections E and D.

For example, if it is set to operate in sections C, B, and A when discharging a lift of 15 m, if the sections C, B, and A (lift 3 m) are operated 5 times, (2.09 + 2.58 + 3. 36) × 5 = 40.15kWmin = 0.669kWh (100%), when each section C (lift 1m) is operated, 2.09 × 15 = 31.35kWmin = 0.523kWh (78.2%) It can be seen that the reduction of power consumption can be achieved.

When section C (lift 1 m) is operated 12 times and sections C, B, A (lift 3 m) are operated once to remove scum, 2.09 × 13 + 2.58 + 3.36 = 33.11 kWmin = 0.552kWh. It becomes (82.5%), and it can be seen that the reduction of power consumption can be achieved while enabling the removal of scum.

It was clarified that the same result can be obtained by performing the same calculation in the case of driving in other sections, for example, sections E, D, and C.

Hereinafter, another embodiment will be described.
In the above-described embodiment, an embodiment in which either the first stop water level or the second stop water level is set as the stop water level by using the inflow water amount or the outflow water amount per predetermined time for the water tank as an index has been described. As an index for setting the above, the starting frequency of the pump per predetermined time may be used.

For example, referring to the Manhole Pump Facility Technical Manual, the minimum starting interval for a 7.5 kW pump is set at 6 minutes. Assuming that such two pumps are provided in the manhole pump device and the two pumps are operated alternately, the minimum starting interval is apparently 3 minutes for the two pumps.

In such a manhole pump device, as one of the methods for switching the stop water level between the first stop water level and the second stop water level, when the start water level is reached, the elapsed time from the previous stop at the stop water level ( An example of the start frequency of the pump per predetermined time) may be confirmed, and the stop water level may be determined based on the elapsed time.

In the pump design, the minimum start-up interval is secured in consideration of the maximum inflow amount into the tank, so if the inflow water amount is normal, the start-up interval will be longer than the minimum start-up interval. Therefore, at the initial stage of construction, the second stop water level is adopted as the initial value of the stop water level, and if the time to reach the start water level from the time the pump is stopped is within 3 minutes, the stop water level is switched to the first stop water level. If it is 3 minutes or more, the stop water level may be maintained at the second stop water level.

When the discharge capacity at the second stop water level (storage capacity from the start water level to the second stop water level) is about 1/2 of the discharge capacity at the first stop water level (storage capacity from the start water level to the first stop water level). If the previous stop water level was the first stop water level and the time to reach the start water level from the time the pump was stopped was 6 minutes or more, the start interval could be 3 minutes or more even if the stop water level was set to the second stop water level. Since it is predicted, the stop water level may be switched to the second stop water level, and the stop water level may be maintained at the first stop water level within 6 minutes.

If one pump is out of order and only the normal pump is operated, the reference value for the time when the starting water level is reached from the time the pump is stopped should be doubled from 6 minutes to 12 minutes. .. If the capacities of the two pumps are different, or if there is an imbalance in the operating time due to a failure or the like, the above reference value may be doubled as the time since the previous operation of the unit.

As described above, when the frequency of starting the pump per predetermined time is low, the power consumption can be suppressed by operating in the region where the power consumption per unit water supply amount is low.

As another method of switching the stop water level between the first stop water level and the second stop water level based on the start frequency of the pump per predetermined time, the method of determining the stop water level according to the number of start times per unit time is adopted. You may.

Since the minimum start interval is 3 minutes in the pump device according to the above example, the stop water level is set to the first stop water level when the start frequency in the past 30 minutes reaches 10 times, and the stop water level is set to the second stop water level when the start frequency is less than 10 times. It may be configured to be set to the stop water level. In this case, considering the possibility that the start interval is less than the minimum start interval, it is desirable that the start frequency for switching the stop water level is about half of the above number.

In the above example, the second stop water level and the first stop water level are set to the fixed water level, the first stop water level is set when the start frequency of the pump per predetermined time exceeds the threshold value, and the first stop water level is set when the start frequency falls below the threshold value. Although the configuration for switching to the 2 stop water level has been described, the second stop water level may be variably set according to the start frequency.

When the activation frequency falls below the threshold value, the second stop water level is set to the start water level side if the degree is large, and the second stop water level is set to the first stop water level side if the degree is small. That is, the second stop water level may be variably set to the start water level side with respect to the first stop based on the index.

In the above-mentioned example in which the elapsed time from the stop water level is used as the start frequency, if the previous stop water level is the first stop water level and the time to reach the start water level from the time the pump is stopped is 6 minutes or more. , The second stop water level may be set closer to the start water level. For example, when the second stop water level is set at a place where the discharge capacity is 1/3 or 1/4, the interval for switching to the second stop water level may be tripled to 9 minutes or quadrupled to 12 minutes.

Depending on the starting frequency of the pump per predetermined time, it may be difficult to continue operation at the fixed value of the second stop water level, but the second stop water level set at that time is an index based on the first stop water level. It may be set variably on the starting water level side based on the above, that is, it may be set on the first stop water level side. For example, if the time to reach the start water level is 6 minutes or less, for example, 4 minutes and 30 seconds, the position where the first stop water level and the second stop water level are halved is set as the new second stop water level. do it. The flow rate per unit time changes depending on the water level, but it is described here uniformly.

In this way, if the pump is variably set to the second stop water level start water level side set at that time depending on the start frequency of the pump per predetermined time, it becomes possible to more flexibly reduce the power consumption, and further. It is possible to reduce the amount of power consumption.

In the above-described embodiment, the present invention has been described as an example of a pump having a characteristic that the amount of power required to discharge a unit water amount decreases as the discharge amount per unit time increases in the range of use. Even for a pump such as an axial flow pump whose shaft power increases as it approaches the deadline operation, the effective storage capacity can be selected by selecting the stop water level and start water level in the region where the power consumption per unit water supply amount of the pump is low. By setting the number of operations larger than the number of operations when the pump is operated at the stop water level and the start water level for discharging or inflowing the pump, the power consumption can be suppressed.

The embodiments described above are merely examples of the present invention, and the description is not intended to limit the technical scope of the present invention, and specific configurations of the manhole pump device and the control device are according to the present invention. Needless to say, it is possible to change and design as appropriate within the range in which the action and effect are exhibited.

10: Manhole pump device 12: Inflow pipe 11: Manhole 13: Rising pipe 14: Outflow pipe 15, 16: Water level sensor 20: Submersible pump 50: Control panel 51: Control device 52: Control unit (microcomputer)
53: Memory 54: Pump drive circuit 55: Communication unit LWL: Stop water level LWL1: First stop water level LWL2: Second stop water level HWL: Start water level HWL1: First start water level HWL2: Second start water level

Claims (12)

It is a manhole pump system equipped with a pump control device that starts the pump when the water level of the water tank reaches the start water level and then stops the pump when the water level reaches the stop water level.
The pump control device has the first stop water level as the stop water level, which is the lower end water level of the effective storage water depth, and the start water level based on the first stop water level based on the power consumption per unit water supply amount of the pump. The second stop water level set on the side is configured to be configurable,
A manhole pump system configured to set either one of the first stop water level and the second stop water level to the stop water level by using the rising speed of the average water level within a predetermined time with respect to the water storage tank as an index. It is a manhole pump system equipped with a pump control device that starts the pump when the water level of the water tank reaches the start water level, then stops the pump when the water level reaches the stop water level, and the maximum start frequency in a predetermined time is set.
The pump control device has the first stop water level as the stop water level, which is the lower end water level of the effective storage water depth, and the start water level based on the first stop water level based on the power consumption per unit water supply amount of the pump. The second stop water level set on the side is configured to be configurable,
A manhole pump system configured to set either one of the first stop water level and the second stop water level to the stop water level by using the start frequency of the pump per predetermined time as an index. The manhole pump system according to claim 1 or 2, wherein the index is calculated by adding preset date and time information. Between along a conveyance path placed has been manhole pump device, storage capacity between the second stop level and activation level of the downstream side of the manhole pump device, and a second stop level of the upstream side of the manhole pump device The manhole pump system according to any one of claims 1 to 3, wherein the second stop water level of the manhole pump device on the downstream side is set so as to be equal to or less than the water storage capacity between the starting water level and the water level. The invention according to any one of claims 1 to 4 , wherein the pump control device is configured to change and set the second stop water level to a lower level when the start frequency of the pump becomes higher than the preset start frequency. Manhole pump system. Pump control apparatus of the manhole a pump device installed in the downstream side along the conveyance path, the water level of the reservoir outputs a start command to the pump controller of the manhole pump device on the upstream side becomes the start water level, upstream The manhole pump system according to any one of claims 1 to 5 , wherein the pump is started after confirming that the pump of the manhole pump device is started. Pump control apparatus of the manhole a pump device installed in the downstream side along the conveyance path, after outputting the start command to the pump controller on the upstream side of the manhole pump device, manhole pump device on the upstream side when a predetermined time has elapsed The manhole pump system according to claim 6 , wherein the pump is configured to start without confirming the start of the pump. Pump control apparatus along a conveyance path manhole pump device installed in the downstream side, claim water level of the reservoir is configured to start the pump after a lapse of a becomes a predetermined time start water level 1 The manhole pump system according to any one of 5 to 5. In the pump control device, even if the water level of the water storage tank becomes the starting water level and the stop water level is set to the second stop water level based on the index, if a predetermined condition is satisfied, the pump control device is described regardless of the index. The manhole pump system according to any one of claims 1 to 8 , which is configured to perform scum discharge control for setting the stop water level to the first stop water level. Wherein the predetermined condition is time information, conveyance manhole pump system of claim 9, wherein it is set to a time later as a manhole pump device on the downstream side along the path. The manhole pump system according to claim 9, wherein the predetermined condition is confirmation of a scum discharge command transmitted from a pump control device of a manhole pump facility on the upstream side. The pump control device is set as the starting water level on the side opposite to the stopped water level with respect to the first starting water level based on the first starting water level and the electric energy consumption per unit water supply amount of the pump. From claim 1, the second starting water level is configured to be configurable, and one of the first starting water level and the second starting water level is set to the starting water level based on the index. 11. The manhole pump system according to any one of 11.

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