JP2019113005A - Manhole pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole pump system capable of effectively suppressing power consumption by controlling the start and stop of a pump and operating the pump by effectively utilizing the capacity of the pump equipment. SOLUTION: A manhole pump system for transporting sewage to a sewage treatment facility by a plurality of manhole pump devices equipped with a pump control device which starts a pump when the water level of a water storage tank reaches a start water level and then stops the pump when the water level reaches a stop water level. Therefore, each pump control device has a second stop water level set on the start water level side based on the first stop water level and the first stop water level based on the power consumption per unit water supply amount of the pump. The stop water level is configured to be configurable, and either the first stop water level or the second stop water level is set to the stop water level using the inflow water amount or the outflow water amount per predetermined time to the water storage tank as an index. There is. [Selection diagram] Fig. 3

Description

  The present invention relates to a manhole pump system.

  In the manhole pump system for transporting sewage to a sewage treatment facility, a plurality of manhole pump devices are installed along the sewage transportation path. The manhole pump device measures a manhole for storing the sewage flowing in from the inflow pipe at the end of the sewage conveyance pipe, a submersible pump for pumping the sewage stored in the manhole to the outflow pipe, and the water level of the sewage stored in the manhole 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 water level falls below the pump start water level. Is equipped.

  The submersible pump installed in the manhole is operated with high head and small amount of water on the pump performance curve, because the large capacity type is selected because the purpose is to drain the maximum inflow of sewage. In some cases.

  By the submersible pump activated at the pump start water level, as the sewage is pumped to the outflow pipe and the water level is lowered, the pumping head is increased, and the pumped water volume is reduced. That is, as the pump stop water level becomes constant, the efficiency gradually decreases and the operation shifts to the operation in the high head and small water volume region.

Patent Document 1: Japanese Patent Application Publication No. 2006-057567

  Since drainage facilities such as manhole pump equipment are designed based on the planned drainage volume etc. set in advance, the actual drainage volume is higher than the planned drainage volume in the middle stage until the population density etc. reaches the scale assumed beforehand. There is also a problem that when the pump is pumped to a constant level of pump stop water level, the efficiency is low and the area including the high head region is included, and the power consumption per unit water supply volume increases. The

  Moreover, after population density etc. reach a previously assumed scale, there may be a situation where the actual drainage volume is smaller than the planned drainage volume due to population decline etc. Even in such a case, the pump stop always fixed at a fixed level When pumping to the water level, there is a problem that the amount of power consumption per unit water supply amount increases.

  SUMMARY OF THE INVENTION In view of the above-described problems, an object of the present invention is a manhole capable of effectively suppressing the amount of power consumption by controlling the start and stop of the pump by effectively utilizing the capacity of the pump installation. The point is to provide a pump system.

  In order to achieve the above object, according to a first feature of the manhole pump system according to the present invention, as described in claim 1 of the document of the claims, the water level of the water reservoir detected by the water level gauge is the start water level. A manhole pump system for transporting waste water to a sewage treatment facility by a plurality of manhole pump devices provided with a pump control device that starts the pump when it reaches a stop level and stops the pump when the water level reaches a stop level. As the stop water level, it is possible to set a second stop water level set on the start water level side on the basis of the first stop water level based on the first stop water level and the power consumption per unit water supply amount of the pump And wherein one of the first stop water level and the second stop water level is the above-mentioned one using the amount of inflow or the amount of outflow water per predetermined time to the water storage tank as an index. In that it is configured to set the stop level.

  There is a correlation between the increase and decrease of the amount of inflow or outflow of water to each manhole arranged along the route for transporting the waste water to the sewage treatment facility, and the tendency of increase and decrease of the waste water generated on the upstream side is transmitted to the downstream side. For example, when the amount of inflow water or outflow water per predetermined time for each water storage tank is large, the occurrence of frequent pump activation is avoided by setting the first stop water level to the stop water level and driving each pump. If the amount of inflow water or outflow water per predetermined time to each water storage tank is small, the second stop water level set on the start water level side with respect to the first stop water level is set as the stop water level and each pump Can be driven and operated in a low area of power consumption per unit water supply. In this way, the power consumption of the entire system can be effectively suppressed.

  According to a second feature of the present invention, as described in claim 2, the pump control device which starts the pump when the water level of the water storage tank detected by the water level gauge reaches the start water level and stops the pump when the water level reaches the stop water level thereafter. Manhole pump system for transporting waste water to a sewage treatment facility by a plurality of manhole pump devices, each pump control device comprising a first stop water level as the stop water level, and consumption per unit water delivery amount of the pump The second stop water level set on the start water level side is settable on the basis of the first stop water level based on the amount of electric power, and the first start water level is set based on the start frequency per predetermined time of the pump. One of the stop water level and the second stop water level is set to the stop water level.

  The pump provided in the water storage facility has a maximum start frequency at a predetermined time. However, there is a margin for the activation frequency except when the amount of inflow or outflow of water to the water storage tank is maximum. Therefore, based on the start frequency per predetermined time, the second stop water level set on the start water level side with reference to 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 By operating in a low volume region, power consumption can be suppressed.

  According to the third aspect, as described in the third aspect, in addition to the above-mentioned first or second aspect, the downstream side of the manhole pump devices disposed adjacent to each other along the sewage transport path. The manhole on the downstream side so that the water storage capacity between the second stop water level and the start water level of the manhole pump device in the above 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 The second stop water level of the pump device is set.

  When the second stop water level is set to the stop water level, the 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. Amount of water. In such a case, the second stop water level of the manhole pump device on the flow side is set so that the storage capacity between the second stop water level and the start water level of the manhole pump device downstream of the water amount becomes equal to or less If so, the downstream manhole pump can be operated in a region where the amount of power consumption per unit water supply amount is low. For example, if the sectional area of each water storage tank of the adjacently arranged manhole pump device is the same, the second stop water level of the downstream manhole pump device is equal to or the same as the second stop water level of the upstream manhole pump device. It may be set to the higher rank above.

  According to the fourth feature configuration, as described in the fourth aspect, in addition to any one of the first to third feature configurations described above, each pump control device is configured to be activated with a preset pump activation frequency. When it becomes higher than the frequency, the second stop water level is set to be changed to a lower level.

  Depending on the start frequency of the pump per predetermined time, it may be difficult to continue operation with the fixed second stop water level, but the second stop water level set at that time is based on the first stop water level If the first stop water level is variably set based on the index, the power consumption can be reduced more flexibly.

  According to the fifth feature configuration, as described in the fifth aspect, in addition to any one of the first to fourth feature configurations described above, a manhole pump device installed downstream along the sewage transport path The pump control device outputs a start command to the pump control device of the upstream manhole pump device when the water level of the water storage tank reaches the start water level, and after confirming that the pump of the upstream manhole pump device has been started The point is that it is configured to start the pump.

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

  According to a sixth aspect of the present invention, in addition to the fifth aspect, as described in the sixth aspect, the pump control device of the manhole pump device installed downstream along the sewage transport path is: The point is configured to start the pump without confirming the start of the pump of the upstream manhole pump device after a predetermined time has elapsed after outputting the start command to the pump control device of the upstream manhole pump device is there.

  If the water level of the water reservoir of the downstream manhole pump device rises while waiting for the inflow of dirty water from the upstream manhole pump device, there is a possibility that the sewage overflows. Such a situation can be avoided by activating the pump after a predetermined time has elapsed after outputting the activation command to the pump control device of the upstream manhole pump device.

  According to a seventh aspect of the present invention, as recited in claim 7, in addition to any one of the above-described first to fourth features, a manhole pump device installed downstream along a sewage transport path. The pump control device is configured to start the pump after a predetermined time has elapsed when the water level of the water storage tank reaches the start water level.

  Even if the water level in the water storage tank reaches the start water level, there is no possibility that the sewage will be an abnormal high water level immediately overflowing the water storage tank, and there is usually some margin. Then, even if the water level of the water storage tank reaches the start water level, by waiting for a predetermined time and then activating the pump, it is possible to gain operating time in a region where the amount of power consumption per unit water supply amount is low.

  According to an eighth aspect of the present invention, in addition to any one of the first to seventh features described above, the pump controller causes the water level of the water storage tank to be the start water level. Even if the stop water level is set to the second stop water level based on the index, scum discharge control is performed to set the stop water level to the first stop water level regardless of the index if a predetermined condition is satisfied. It is in the point where it is configured.

  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, waste water will continue to stagnate in the water storage tank and a scum will occur and grow, causing odor There is a possibility that the environment of the water storage tank may be deteriorated due to generation 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, the scum is transported to the downstream side together with the dirty water by forcibly setting the first stop water level, and the environment is deteriorated Can be prevented.

  In the ninth characteristic structure, as described in the ninth aspect, in addition to the eighth characteristic structure described above, the predetermined condition is time information, and a manhole pump on the downstream side along the sewage transport path The device is set to a later time.

  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 first stop water level at a predetermined time. By setting the predetermined time to be as late as the downstream manhole pump device, the scum can be conveyed from the upstream side to the downstream side along the sewage conveyance path without stagnation.

  According to the tenth characteristic configuration, as described in the tenth aspect, in addition to the eighth characteristic configuration described above, a scum discharge command in which the predetermined condition is transmitted from the pump control device of the upstream manhole pump facility It is in the point of being confirmation of.

  The pump controller of the downstream manhole pump facility that received the scum discharge command from the pump controller of the upstream manhole pump facility executes the scum discharge control to set the stop water level to the first stop water level From the upstream side to the downstream side The scum discharge control is sequentially executed, and the scum is conveyed from the upstream side to the downstream side along the dirty water conveyance path without any delay.

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

An explanatory view of a manhole pump system to which the present invention is applied Explanatory drawing of the manhole pump apparatus used for this invention Explanation of pump control device Flow chart showing pump operation method Explanation of simulation results

  Hereinafter, a manhole pump system according to the present invention, a pump control apparatus incorporated in the manhole pump system, and a pump operation method will be described.

  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) disposed at predetermined intervals along a sewage pipe buried in the ground. System 100 is configured. n is the number of facilities, and one group is composed of dozens of facilities and dozens of facilities. And, a plurality of groups are constructed along the route of the sewage pipe arranged toward the sewage treatment plant.

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

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

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

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

  Furthermore, the monitor signal output from the microcomputer 52 is input, and 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 Wi-Fi or a cellular phone network. Communication unit 55 and the like.

  Specifically, it relates to an abnormal state such as abnormal heating detected by the pump start time or the number of times of activation per day, occurrence of an abnormal high water level, and further an abnormal high water level detected by the control unit 52 Information, and further setting information of the pump start water level and the pump stop water level described below, its time information, and the like are transmitted to the remote management device 56 through 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 motor 30 of the submersible pump 20. For example, when the pump drive circuit 54 is configured by an inverter circuit, the rotational speed of the motor 30 is controlled, and when the pump drive circuit 53 is configured by a relay circuit for power supply, the power supply state to the motor 30 Is controlled.

  When the water level sensor 15 detects that the water storage amount has reached the pump activation water level HWL, the control unit 52 activates the electric motor 30 (hereinafter, also referred to as “activation of the submersible pump”) to lower the dirty water by the submersible pump 20 When the pump stop water level LWL is measured, the electric motor is started after a predetermined time has elapsed, 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 30 is stopped to stop drainage of sewage by the submersible pump 20.

  As shown in FIG. 2, the control unit 52 sets the stop water level LWL to the start water level HWL side based on the first stop water level LWL1 and the first stop water level LWL1 set to the effective reservoir depth lower end water level of manhole equipment The second stop water level LWL2 set to the high water level side is configured to be settable, and the first stop water level LWL1 or the second stop water level LWL2 using the inflow amount or outflow amount per predetermined time for the manhole 11 as an index It is configured to set one to the stop water level LWL.

  Furthermore, the control unit 52 sets, as the start water level HWL, a second start water level HWL2 set on the opposite side to the stop water level LWL based on the first start water level HWL1 and the first start water level HWL1; It is configured to be able to set one of the first start water level HWL1 and the second start water level HWL2 to the start water level HWL based on the index.

  For example, when there is a large amount of inflow or outflow of water per predetermined time to the manhole 11, the frequent stop of the pump can be avoided by driving the submersible pump 20 by setting the first stop water level LWL1 to the stop water level LWL. If the amount of inflow water or outflow water per given time to the manhole 11 is small, set the second stop water level LWL2 set to the start water level HWL side to the stop water level LWL based on the first stop water level LWL1. The submersible pump 20 is driven. By the latter control, it is possible to suppress the power consumption by avoiding the operation in the region where the power consumption per unit water supply amount is high.

  Further, by configuring the start water level HWL to be switchable between the above-described first start water level HWL1 and the second start water level HWL2 opposite to the stop water level LWL based on the first start water level HWL1. It becomes possible to operate in a region where the amount of power consumption per unit water supply amount is low, and to reduce power consumption more effectively. In addition, at least the stop water level may be configured to be switchable.

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

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

  The amount of inflowing water per predetermined time can be judged based on the rising speed of the latest water level measured by the water level gauge 15 when the submersible pump 20 is stopped. It can be determined based on the rising speed, and the index may be calculated taking into consideration the latest operation time of the submersible pump 20.

  In the latter case, when the operation time of the submersible pump 20 from the start water level HWL to the stop water level LWL is long, it can be determined that the amount of inflow water per predetermined time is large, and the time from the start water level HWL to the stop water level LWL If the operation time of the submersible pump 20 is short, it can be determined that the amount of inflowing water per predetermined time is small.

  By monitoring the latest water level fluctuation or the latest operation time of the pump, it is possible to know the amount of water required by the pump at that time, so by learning the situation based on such information and setting the appropriate stop water level At the same time, an operation capable of reducing the power consumption while maintaining the predetermined water supply amount required is possible.

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

  Furthermore, the index may be calculated in consideration of preset date and time information. For example, if it is a residential area, the amount of water use will increase in the morning or evening, and if it is a factory area, the amount of water will increase in the daytime, depending on the time zone of the day, Distinctive patterns can be seen on weekends. If the index is calculated in consideration of such characteristic patterns, it is possible to reduce the power consumption more realistically.

  Since such date and time information differs from region to region, each date and time information is 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 be configured to be variably settable based on the index, and that the power consumption amount be further reduced according to the fluctuation of the inflow water amount flexibly. It will be possible. For example, when the amount of inflow water per predetermined time is very 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.

  Furthermore, the submersible pump 20 is operated a predetermined number of times with the first stop water level LWL1 set below the effective reservoir depth lower water level of the manhole equipment and the second stop water level LWL2 set to the stop water level LWL and / or a predetermined time has elapsed Then, it is preferable that the submersible pump 20 be operated at least once by setting the first stop water level LWL1 to the stop water level LWL.

  In the manhole pump device 10, organic substances such as soot and fats and oils mixed in the inflow water to the reservoir float on the water surface to generate a scum which is formed in the form of a film, thereby generating an offensive odor inside. Even in such a case, the pump is operated a predetermined number of times with the first stop water level LWL1 set below the effective reservoir depth lower water level of the manhole facility and the second stop water level LWL2 above it set at the stop water level If the stop water level LWL is set to the first stop water level LWL1 and the pump is operated when the predetermined time has elapsed, the scum accumulated in the manhole 11 is drained by the submersible pump 20, and the manhole 11 is cleaned. Will be

  Moreover, it is preferable that the starting water level HWL and the 2nd stop water level LWL2 are set so that the minimum starting time interval of the submersible pump 20 set beforehand may be satisfy | filled.

  When the start-up time interval of the pump is short, the power consumption increases due to frequent start-up and heat generation of the motor of the pump may occur, which may deteriorate the life of the motor, that is, the pump. However, by setting the start water level and the second stop water level appropriately, it is possible to satisfy the preset minimum start time interval of the pump, and it is possible to avoid the occurrence of the above-mentioned inconvenience.

  As shown in FIG. 5, the pump needs to be a pump that exhibits 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.

A pump operation method executed by the control unit 52 of the pump having the characteristic similar to FIG. 5 will be described based on the flowchart shown in FIG.
The control unit 52 reads out the index from the memory 53 (S1), and when the value is lower than the preset threshold, that is, when it is judged that the inflow per unit time is small (S2), the start water level is HWL2, stop The water level is set to LWL2 (S3), and when it is determined that the inflow per unit time is large (S2), the start water level is set to HWL1 and the stop water level is set to LWL1 (S11).

  When the start water level is HWL2 and the stop water level is set to LWL2 (S3) and the water level of the manhole 11 becomes equal to or higher than the start water level HWL2 (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.

  If the value of the pump activation counter is less than the preset threshold N (N = 6 in the present embodiment) (S6), it is driven until the water level drops based on the stop water level LWL2 (S8) Then, the water level is driven based on the stop water level LWL1 until the water level drops below the stop water level LWL1 (S7), the value of the pump activation counter is reset to 0 (S9), and the submersible pump 20 It is stopped (S10).

  That is, the pump is stopped when the water level reaches the stop water level LWL2 until the value of the pump start counter reaches N = 6, and the pump is stopped when the water level reaches the stop water level LWL1 when the value of the pump start counter becomes N = 6 . As a result, the scum accumulated in the manhole 11 is crushed and pumped downstream along with the dirty water.

  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 manhole 11 becomes equal to or higher than start water level HWL1 (S12), the pump is started (S13) and the water level becomes equal to or less than stop water level LWL1. (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 is provided with a pump control device 51 that starts the pump when the water level of the water storage tank detected by the water level gauge 15 reaches the start water level HWL and then stops the pump 20 when the water level reaches the stop water level LWL. It is a manhole pump system which conveys sewage to a sewage treatment facility by a plurality of manhole pump devices 10, and each pump control device 52 sets the first stop water level LWL1 and the unit water supply amount of the pump 20 as the stop water level LWL. The second stop water level LWL2 set on the start water level HWL side is settable on the basis of the first stop water level LWL1 based on the power consumption, and the inflow or outflow water quantity per predetermined time to the water storage tank is used as an index Set one of the first stop water level LWL1 and the second stop water level LWL2 to the stop water level LWL Is constructed sea urchin.

  Then, each pump control device 52 is configured to set the second stop water level LWL2 based on the latest water level fluctuation measured by the water level gauge 15 or based on the latest operation time of the pump 20. .

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

  Therefore, when the amount of inflow water or outflow water per predetermined time to each water storage tank is small, the plurality of manhole pump devices 10 constituting the manhole pump system 100 are all set on the start water level side based on the first stop water level LWL1. By setting each 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 amount of power consumption per unit water supply amount is low.

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

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

  When the capacity of the water storage tank is equal between adjacent manhole apparatuses 10, that is, when the cross sectional area of the water storage tank is equal, the second stop water level LWL2 of the downstream manhole pump apparatus is the second of the upstream manhole pump apparatus. It is preferable that the level is set to be equal to or higher than the stop water level LWL2, and the downstream manhole pump can be operated in a region where the amount of power consumption per unit water supply amount is low.

  Usually, the capacity of the water storage tank of the manhole pump device 10 arranged along the sewage conveyance path is set so that the most downstream side is larger than the most upstream side, but the capacity of the water storage tank between adjacent manhole devices Between the manhole pump devices 10 disposed adjacent to each other along the sewage transfer path, the storage capacity between the second stop water level LWL2 and the start water level HWL of the downstream manhole pump device 10 is the same. Preferably, the second stop water level LWL2 of the downstream manhole pump device is set to be equal to or less than the storage capacity between the second stop water level LWL2 and the start water level HWL of the upstream manhole pump device 10. .

  The control unit 52 of each pump control device 10 changes and sets the second stop water level LWL2 low, that is, the first stop water level LWL1 side, when the start frequency of the pump 20 becomes higher than the start frequency set in advance. It is preferable that it is comprised.

  Depending on the start frequency of the pump per predetermined time, it may be difficult to continue operation with the fixed second stop water level, but the second stop water level set at that time is based on the first stop water level If the first stop water level is variably set based on the index, the power consumption can be reduced 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 conveyance path of the dirty water, when the water level of the water storage tank reaches the start water level HWL, 52) may be configured to output a start command and to start the pump after confirming that the pump 20 of the upstream manhole pump device 10 has been started.

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

  In the above description, an example in which the communication unit 55 is the communication unit 55 that can be connected to the Internet via Wi-Fi or a cellular phone network has been described, but communication is performed using another wireless communication device such as a low power wireless device The part 55 may be configured. The upstream and downstream manhole pump devices 10 refer to two adjacent manhole pump devices 10 along the dirty water transfer path.

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

  In addition, the pump control device 51 (52) of the manhole pump device 10 installed on the downstream side along the dirty water 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 has passed, the pump 20 may be activated without confirming a response from the pump control device 51 (52) of the upstream manhole pump device 10 to the effect of activation.

  If the water level of the water storage tank of the downstream manhole pump device 10 rises while waiting for the inflow of dirty water from the upstream manhole pump device 10, there is a possibility that the sewage overflows. After the start command is output to the pump controller 51 (52) of the upstream manhole pump unit 10, the pump is started when a predetermined time elapses, whereby the water level of the water storage tank reaches the abnormal high water level HHWL downstream Water can be sent to the side. Even with such a configuration, it is possible to earn an operating time in a region where the amount of power consumption per unit water supply amount is low.

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

  Even if the water level in the water storage tank reaches the start water level HWL, there is no possibility that the waste water will be the abnormal high water level HHWL immediately overflowing from the water storage tank, and there is usually some margin. Then, even if the water level of the water storage tank reaches the start water level, by waiting for a predetermined time and then activating the pump, it is possible to gain operating time in a region where the amount of 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 side of the start water level HWL than the first stop water level LWL1, dirty water is continuously accumulated in the water storage tank and a scum occurs. There is a possibility that the environment of the water storage tank may be deteriorated due to the growth and the generation of an offensive odor and the clogging of the water supply 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 (inflow water volume or outflow water volume per predetermined time) together with the sewage by forcibly setting it to the first stop water level The scum is transported downstream, which can prevent the environmental deterioration.

  Specifically, in the pump control device 51 (52), even if the water level of the water storage tank becomes the start water level HWL and the stop water level is set to the second stop water level LWL2 based on the index described above, the predetermined condition is satisfied. The scum discharge control may be performed to set the stop water level to the first stop water level LWL1 regardless of the index.

  The predetermined condition may be time information, and the downstream manhole pump device may be set to a later time along the waste water conveyance 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 first stop water level at a predetermined time. By setting the predetermined time to be as late as the downstream manhole pump device, the scum can be conveyed from the upstream side to the downstream side along the sewage conveyance path without stagnation.

  The predetermined condition may be confirmation of a scum discharge command transmitted from the pump control device of the upstream manhole pump facility. The pump controller of the downstream manhole pump facility that received the scum discharge command from the pump controller of the upstream manhole pump facility executes the scum discharge control to set the stop water level to the first stop water level From the upstream side to the downstream side The scum discharge control is sequentially executed, and the scum is conveyed from the upstream side to the downstream side along the dirty water conveyance path without any delay.

  The scum discharge command may be configured to communicate with each other between the communication units 55 of the upstream and downstream manhole pump devices 10, and the upstream and downstream manhole pump devices 10 may be remote management devices. It may be configured to communicate via 56.

  If the first stop water level is set below the effective reservoir depth lower end water level of the manhole equipment, the scum will be effectively discharged during the scum discharging operation.

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

  Here, the 1 m discharge electric energy refers to the electric energy consumed to discharge a height of 1 m assuming a water tank of the same cross section. Because it is a water tank of the same cross-sectional area, the amount of water spouted for 1 m in height will always be the same.

  For example, when discharging 10 m of head, if it is set to operate in section B, A (lift 2 m), operating B, A section 5 times, (2.58 + 3.36) x 5 = 29 .7 kWmin = 0.495 kWh (100%) of electricity will be required.

  If it is operated 10 times only in section B (lift head 1 m), it is 2.58 × 10 = 25.8 kWmin = 0.43 kWh (86.9%), and it can be seen that reduction of power consumption can be achieved.

  Operating 8 times only in section B (lift height 1 m) and then operating sections A and B (lift height 2 m) once, 2.58 × 9 + 3.36 = 26.58 kW min = 0.443 kWh (89.5%), The operation of sections B and A makes it possible to remove scum while achieving low power consumption.

  It can be seen that the reduction in power consumption can be achieved in the same simulation also for the sections E and D.

  For example, when discharging 15 m of lift, if it is set to operate in the sections C, B, A, if operating C, B, A section (lift 3 m) five times, (2.09 + 2.58 + 3.3. 36) × 5 = 40.15kWmin = 0.669kWh (100%), when operating section C (1m lift) each time, 2.09 × 15 = 31.35kWmin = 0.523kWh (78.2%) It can be seen that the reduction of power consumption can be achieved.

  Operating section C (lift head 1 m) 12 times and removing sections C, B, A (lift head 3 m) once for scum removal, 2.09 × 13 + 2.58 + 3.36 = 33.11 kWmin = 0.552 kWh It becomes (82.5%), and it turns out that reduction of power consumption can be achieved while making it possible to remove scum.

  It has become clear that the same result can be obtained by performing the same operation when operating in other sections, for example, sections E, D and C.

Another embodiment will be described below.
In the embodiment described above, an aspect has been described in which one of the first stop water level and the second stop water level is set as the stop water level using the inflow water amount or the outflow water amount per predetermined time to the water storage tank as an index. The start frequency per predetermined time of the pump may be used as an index for setting the.

  For example, referring to the manhole pump facility technical manual, the minimum activation interval of the 7.5 kW pump is set at 6 minutes. Assuming that such two pumps are provided in the manhole pump device and two pumps are operated alternately, the apparent apparent minimum time for the two pumps is 3 minutes.

  In such a manhole pump device, when one of the methods to switch the stop water level to either the first stop water level or the second stop water level, when the start water level is reached, the elapsed time since the previous 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 into the tank, so the start-up interval will be longer than the minimum start-up interval if the amount of incoming water is normal. Therefore, at the initial stage of construction, the second stop water level is adopted as the initial value of the stop water level, and the stop water level is switched to the first stop water level if the time to reach the start water level after stopping the pump is within 3 minutes. 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 last stop water level is the first stop water level and the time to reach the start water level after stopping the pump is 6 minutes or more, the start water level will be the second stop water level and the start interval will be 3 minutes or more As it is predicted, the stop water level may be switched to the second stop water level, and within 6 minutes, the stop water level may be maintained at the first stop water level.

  In addition, what is necessary is just to make the reference value of the time which reached the starting water level from the time of stopping a pump double to 12 minutes from 6 minutes when it becomes an operation only with a normal pump in the state where one pump failed . In addition, when the capacities of the two pumps are different or when an imbalance occurs in the operation time due to a failure or the like, the above-described reference value may be doubled as the time from the previous operation of the relevant machine.

  As described above, when the start frequency of the pump per predetermined time is low, the power consumption can be suppressed by operating in a region where the amount of 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, a method of determining the stop water level according to the number of times of start per unit time is adopted May be

  Since the minimum activation interval is 3 minutes in the pump apparatus according to the above example, the stop water level is set to the first stop water level when the activation frequency reaches 10 times in the past 30 minutes, and the stop water level is 2nd if it does not reach 10 times. It may be configured to be set to the stop water level. In this case, in consideration of the possibility that the start interval is less than the minimum start interval, it is desirable to set the start frequency of switching the stop water level to about half of the above number.

  In the example described above, the second stop water level and the first stop water level are set to the fixed water level, and the pump start frequency is set to the first stop water level when the start frequency per predetermined time becomes equal to or higher than the threshold. Although the configuration for switching to the second stop water level has been described, the second stop water level may be variably set according to the start frequency.

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

  In the above example where the elapsed time since stopping at the stop water level is the activation frequency, if the previous stop water level is the first stop water level and the time it has reached the start water level since stopping the pump is 6 minutes or more The second stop water level may be set closer to the start water level. For example, in the case where the second stop water level is set 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 start frequency of the pump per predetermined time, it will be difficult to continue operation with the fixed second stop water level, but the second stop water level set at that time is an index based on the first stop water level And may be set variably on the start water level side, that is, may be set on the first stop water level side. For example, if the time when the start water level is reached is 6 minutes or less, for example, if it is 4 minutes and 30 seconds, then the position where one half of the first stop water level and the second stop water level are set as the new second stop water level do it. Although the flow rate per unit time changes depending on the water level, it is described here as uniform.

  As described above, when the second stop water level start water level side set at that time is variably set according to the start frequency per predetermined time of the pump, it is possible to reduce the power consumption more flexibly and further Power consumption can be reduced.

  In the embodiment described above, the present invention has been described by way of an example of a pump showing a characteristic that the amount of power required to discharge a unit water amount decreases as the discharge amount per unit time increases in a use range. Even if the pump is an axial flow pump whose axial power increases as it approaches the shutoff operation, select the stop water level and the start water level in the area where the power consumption per unit water delivery capacity of the pump is low, and the effective storage capacity By setting the number of operations more than the number of operations in the case of operating the pump at the stop water level and the start water level for discharging or inflowing, the power consumption can be suppressed.

  The embodiment described above is only an example of the present invention, and the technical scope of the present invention is not intended to be limited by the description, and the specific configuration of the manhole pump device and the control device according to the present invention It is needless to say that appropriate design changes can be made as long as the effects can be achieved.

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 (10)

The pump is activated when the water level of the storage tank detected by the water level gauge reaches the start water level, and then the sewage is transported to the sewage treatment facility by a plurality of manhole pump devices provided with a pump control device that stops the pump when the water level reaches the stop water level. A manhole pump system,
Each pump control device sets the second stop water level on the basis of the first stop water level based on the first stop water level and the power consumption per unit water supply amount of the pump as the stop water level. Stop water level is configured to be configurable,
The manhole pump system configured to set any one of the first stop water level and the second stop water level to the stop water level using the inflow water amount or the outflow water amount per predetermined time to the water storage tank as an index. The pump is activated when the water level of the storage tank detected by the water level gauge reaches the start water level, and then the sewage is transported to the sewage treatment facility by a plurality of manhole pump devices provided with a pump control device that stops the pump when the water level reaches the stop water level. A manhole pump system,
Each pump control device sets the second stop water level on the basis of the first stop water level based on the first stop water level and the power consumption per unit water supply amount of the pump as the stop water level. Stop water level is configured to be configurable,
The manhole pump system configured to set any one of the first stop water level and the second stop water level to the stop water level using the start frequency of the pump per predetermined time as an index.   The water storage capacity between the second stop water level and the start water level of the downstream manhole pump device is the second stop water level of the upstream manhole pump device between the manhole pump devices arranged adjacently along the waste water transfer path. The manhole pump system according to claim 1 or 2, wherein the second stop water level of the downstream manhole pump device is set so as to be equal to or less than the water storage capacity between and the start water level.   The pump control device according to any one of claims 1 to 3, configured to change and set the second stop water level to low when the pump start frequency becomes higher than a preset start frequency. Manhole pump system.   The pump control device of the manhole pump device installed downstream along the conveyance path of the dirty water outputs the start command to the pump control device of the upstream manhole pump device when the water level of the water storage tank becomes the start water level The manhole pump system according to any one of claims 1 to 4, which is configured to start the pump after confirming that the pump of the side manhole pump device has been started.   The pump control device of the manhole pump device installed downstream along the conveyance path of the dirty water outputs the start command to the pump control device of the upstream manhole pump device, and then, when a predetermined time elapses, the upstream manhole pump The manhole pump system according to claim 5, wherein the manhole pump system is configured to start the pump without confirming the start of the pump of the device.   The pump control device of the manhole pump device installed downstream along the conveyance path of the sewage is configured to start the pump after a predetermined time has elapsed when the water level of the water storage tank reaches the start water level. The manhole pump system in any one of 1-4.   The pump control device stops the pump regardless of the indicator even if the water level of the water storage tank becomes the start water level and the stop water level is set to the second stop water level based on the indicator regardless of the indicator The manhole pump system according to any one of claims 1 to 7, configured to execute scum discharge control for setting the water level to the first stop water level.   The manhole pump system according to claim 8, wherein the predetermined condition is time information, and the downstream manhole pump device is set at a later time along the waste water conveyance path.   The manhole pump system according to claim 8, wherein the predetermined condition is confirmation of a scum discharge command transmitted from a pump control device of an upstream manhole pump installation.

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