JP2004232254A - Submerged pump system and driving control method of submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a submerged pump system and a driving control method of a submerged pump for efficiently draining waste water flowing in a storage water tank to the outside of the storage water tank according to an inflow water quantity of the waste water into the always changing storage water tank by using the submerged pump arranged in the storage water tank for storing the waste water flowing in from the upstream side by cutting off water of the outflow to the downstream side. <P>SOLUTION: Elapsed time is measured until a float switch 18b detects a rising water level after a float switch 18a detects the rising water level, and the total quantity of the waste water between the float switch 18a and the float switch 18b is determined in advance by a manhole diameter, an inner diameter of a sewer pipe and an installation inclination, and a water level rising rate is determined by the total quantity and the elapsed time. A rotating speed of the submerged pump 2 is controlled by an inverter according to the determined water level rising rate. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is directed to a storage tank that stores wastewater flowing from an inflow pipe and discharges wastewater to a downstream side from an outflow pipe, and discharges wastewater flowing into the storage tank when the downstream drainage is stopped. The present invention relates to a submersible pump system and a drive control method for the submersible pump which can be efficiently discharged to the outside by a submersible pump disposed in the submersible pump.
[0002]
[Prior art]
2. Description of the Related Art A sewage pump system has been known in which sewage flowing into a sewage tank is pumped up by a submersible pump provided in the sewage tank and pumped to a sewage treatment plant or the like. In these sewage pump systems, a discharge amount prediction method (for example, see Patent Document 1) has been proposed as a method for predicting the discharge amount of a manhole built-in pump.
[0003]
Further, there has been proposed an inflow measuring device for measuring a flow rate of inflow water flowing into a manhole (for example, see Patent Document 2).
[0004]
A method for predicting the discharge amount of a pump with a built-in manhole described in Patent Document 1 will be described with reference to FIG.
A pump 22 is provided in the manhole unit main body 21, and sewage flowing from an upstream sewer pipe 23 flows out to a downstream sewer pipe 25 connected to a discharge pipe 24 of the pump 22. A pump drive water level detection sensor 26, a pump stop water level detection sensor 27, and a set water level detection sensor 28 are provided in the unit body 21.
[0005]
The pump driving water level detection sensor 26 is disposed on the upper side in the unit body 21 and has a pump driving water level W. _H Is detected. The pump stop water level detection sensor 27 is disposed near the bottom surface of the unit body 21 and has a pump stop water level W. _L Is detected. The set water level detection sensor 28 detects the pump stop water level W _L Setting water level W which is higher than the water level by 1/2 to 9/10 _S It is arranged in.
[0006]
The detection signals from the sensors 26, 27, and 28 are input to the control device 29, and the control device 29 estimates the discharge amount of the pump 22 based on the input detection signals from the sensors 26, 27, and 28. .
[0007]
Drainage from homes, factories and the like flows into the unit body 21 at any time, and the water level gradually rises. When the rising water level is detected by the pump stop water level detection sensor 27, the timer is started. Thereafter, if the rising water level is detected by the set water level detection sensor 28, the elapsed time t ₁ Is stored. Further, if the rising water level is detected by the pump drive water level detection sensor 26, the elapsed time t ₂ And driving of the pump 22 is started.
[0008]
Since the water level is gradually lowered by driving the pump 22, the pump stop water level W is detected by the pump stop water level detection sensor 27. _L When it is detected that the pump 22 has descended, the drive of the pump 22 is stopped after a predetermined time has elapsed, and the elapsed time t ₃ Is stored. Then, the discharge amount Qout by the pump 22 is predicted.
[0009]
The prediction of the pump discharge amount Qout is performed according to the following equation. Here, it is taken into consideration that while the pump 2 is driven to discharge the wastewater, the wastewater flows into the unit main body 21 and the amount of the wastewater varies depending on the time zone.
[0010]
Qout = (V + V ₂₃ / T ₂₃ × Ton) / Ton
V: Pump stop water level W _L From pump drive water level W _H Volume up to,
Ton: Pump drive water level W _H From pump stop water level W _L Drive time of the pump 2 up to (t) ₃ -T ₁ ),
V ₂₃ ： Set water level W _S From pump drive water level W _H Volume up to,
T ₂₃ ： Set water level W _S From pump drive water level W _H Time to (t ₂ -T ₁ ),
Volume V and V ₂₃ Is used for data stored in advance.
[0011]
Further, the drive time Ton of the pump 22 and the elapsed time T ₂₃ For Ton = t as shown in FIG. ₃ -T ₁ , T ₂₃ = T ₂ -T ₁ Can be obtained by
[0012]
The set water level detection sensor 28 detects the pump stop water level W _L Set water level W located 1/2 to 9/10 of the distance between both water levels _S It is provided in. Set the water level detection sensor 28 to the pump stop water level W _L By providing the pump at a position lower than 1/2 of the interval between the two water levels, the difference from the case where the water level is detected by the pump stop water level detection sensor 27 is reduced, and it becomes difficult to accurately predict the discharge amount. And the pump stop water level W _L , The difference between the water level detected by the pump driving water level detection sensor 26 and the set water level W is almost eliminated. _S From pump drive water level W _H It is prevented that it is difficult to accurately detect the time to reach.
[0013]
Thus, the discharge amount of the pump 22 is predicted in consideration of the amount of drainage flowing into the unit body 21 immediately before the start of discharge by the pump 22. That is, the discharge amount of the pump 22 is predicted based on the amount of drainage flowing into the unit main body 21 in a time period close to the start of driving of the pump 22, and the drainage amount of the drainage is managed and occurrence of a malfunction of the pump 22 is detected. And so on.
[0014]
However, the discharge amount prediction method described in Patent Literature 1 does not change and control the discharge amount of the pump according to the amount of drainage flowing into the unit main body 21. It is only after the water is discharged from the pump driving water level to the pump stop water level by the pump 22 that the discharge amount of the pump 22 performed during this period is predicted, and the discharge amount of the pump 22 installed in the unit 21 is predicted. Was just to manage whether it was appropriate.
[0015]
For this reason, when the wastewater flowing into the unit 21 increases rapidly, there is no action to be taken to efficiently discharge the increased wastewater or to determine whether there is a risk of the wastewater overflowing from the unit 21. I couldn't do that.
[0016]
Further, an apparatus for measuring the flow rate of inflow water into a manhole described in Patent Document 2 will be described with reference to FIG.
According to the control program preset and stored in the personal computer 38, the flow rate information on the inflow side to the manhole 31 is obtained by the automatic calculation in (1) the adjustment mode and (2) the measurement mode.
[0017]
First, (1) in the adjustment mode, water is stored to a position lower than the pipe bottom of the inflow pipe 32 and as high as possible, and the inflow pipe 32 is stopped. Next, only one of the pumps 34 is operated, and the water level change speed V obtained from the water level change amount H (change time T) per unit time when the water level falls is obtained. ₁ (V ₁ = H / T) to calculate the discharge amount Q in one pump 34 ₁ = A × (−V ₁ ).
[0018]
Similarly, water is stored to a position lower than the pipe bottom of the inflow pipe 32 and as high as possible, and after stopping the inflow pipe 32, the two pumps 34 and 35 are simultaneously operated, and the discharge amount Q ₂ = A × (−V ₂ ). The discharge amount Q thus obtained ₁ , Q ₂ Is temporarily stored in the storage unit.
[0019]
Next, in the (2) measurement mode, the water stop state is released, the number of operating pumps (34, 35) is determined, and the flow rate into the manhole 1 is automatically calculated by the following equations.
Inflow rate Q when both pumps 4 and 5 are stopped ₀ Is Q by the cross-sectional area A of the manhole and the speed V of the water level change due to the inflow. ₀ = A × V.
Inflow rate Q when one pump (34 or 35) is operating ₀₁ Is the water level change speed V due to the cross-sectional area A of the manhole, the inflow flow rate flowing while being discharged by the pump, and the discharge amount Q ₁ From, Q ₀₁ = A × V + Q ₁ = A × (V−V ₁ Is calculated as
Inflow flow rate Q when two pumps (34, 35) are operating ₀₂ Is the water level change speed V due to the cross-sectional area A of the manhole, the inflow flow rate flowing in while being discharged by the two pumps, and the discharge amount Q by the two pumps. ₂ From, Q ₀₁ = A × V + Q ₂ = A × (V−V ₂ ).
[0020]
However, also in this flow rate measuring device, the flow rate flowing into the manhole is obtained only from the water level change amount H per unit time when the water level falls and the pump discharge flow rate measured in advance. Therefore, when the amount of wastewater flowing into the manhole 31 increases rapidly, there is nothing about whether to efficiently discharge the increased wastewater or whether there is a risk that the wastewater overflows from the manhole 31. Could not respond.
[0021]
Further, since the amount of change H when the water level decreases is continuously measured by the liquid level detection sensor, when the inflow water flowing into the manhole contains dirt or the like, the dirt or the like adheres to the liquid level detection sensor. As a result, a change in water level could not be measured, and a situation occurred, and the water level could not always be detected in the manhole.
[0022]
[Patent Document 1]
JP 2001-4415 A
(See Abstract, Claims, Paragraph Nos. 0010-0015, FIGS. 1-3)
[Patent Document 2]
JP-A-11-131584
(See Abstract, Claims, Paragraph Nos. 0011-0012, FIG. 1.)
[0023]
[Problems to be solved by the invention]
In the present invention, the outflow to the downstream side is stopped, and the submersible pump installed in the storage tank for storing the drainage flowing in from the upstream side is used. It is another object of the present invention to provide a submersible pump system and a drive control method for the pump, which can efficiently discharge the wastewater flowing into the storage water tank to the outside of the storage water tank. In particular, it is an object of the present invention to provide a submersible pump system and a drive control method for the submersible pump that can use the submersible pump with a drainage capacity appropriate for each case even when the change width of the inflow rate into the storage water tank is large.
[0024]
[Means for Solving the Problems]
The above object is effectively achieved by the invention according to each claim of the present application having the following matters.
[0025]
That is, the invention according to claim 1 is connected to a submersible pump provided in a storage tank for storing drainage flowing from an inflow pipe and discharging drainage downstream from an outflow pipe, and a discharge port of the submersible pump. A pumping pipe, a downstream stopcock provided in the outflow pipe, a water level detector for detecting a plurality of water levels in the storage water tank, and a detection signal from the water level detector, and according to the detection signal, A control device for controlling the discharge amount of the submersible pump, the control device outputs a control signal for controlling the rotation speed of the submersible pump according to the rising water level of the drainage stored in the storage water tank, A submersible pump system, wherein the number of rotations of the submersible pump is inverter-controlled by the control signal, and the drainage in the storage water tank is discharged to the outside through the pumping pipe by the inverter-controlled submersible pump. In the arm.
[0026]
In the present invention, the water level rise due to the drainage flowing into the storage water tank is detected at a plurality of positions by the water level detector, and the number of rotations of the submersible pump is inverter-controlled in accordance with the detected water level, whereby the condition of the water level rise By operating the submersible pump with a discharge capacity corresponding to the above, the wastewater in the storage water tank can be discharged to the outside. In addition, by controlling the number of rotations of the submersible pump according to the rising water level of the drainage, the submersible pump's rotation is controlled with the discharge capacity appropriate for each time, even when the inflow rate into the storage tank changes greatly. And the mismatch that the discharge capacity of the submersible pump becomes excessive can be prevented.
[0027]
The storage water tank used in the present invention includes a manhole into which drainage from homes and factories flows, a storage water tank provided in the middle of an agricultural waterway, and a flow path for adjusting the flow state in the flow path. Various storage water tanks such as a storage water tank provided on the way can be used.
[0028]
As the water level detector, various water level detectors can be used. However, in order to prevent dirt, dust, and the like from adhering to the detection unit, it is preferable that the detection unit use a water level sensor that does not contact drainage.
In particular, when a float switch is used as the water level detector, highly reliable water level measurement can be continuously performed with a simple measuring mechanism, and the cost as the water level detector can be suppressed.
Further, in the float switch, an a contact at which the switch is turned on at the time of detecting the water level and a b contact at which the switch is turned off can be selected. However, disconnection of the float switch can be detected. It is desirable to select the b contact that becomes
[0029]
According to a second aspect of the present invention, in addition to the first aspect, the control device can set a rotation speed of the submersible pump in advance in accordance with each detection signal corresponding to a plurality of water levels from the water level detector. And, when the water level in the storage tank rises, in response to each detection signal input from the water level detector, the control signal with the rotation speed set by the setting means, In a submersible pump system that limits the output to the submersible pump.
[0030]
According to the present invention, the number of rotations of the submersible pump to be controlled corresponding to the plurality of water level detection positions can be set in advance, and the submersible pump can be set to the predetermined number of rotations in accordance with the water level detected by the water level detector. The pump can be controlled.
Accordingly, it is possible to set so as to increase the number of rotations for controlling the submersible pump when the water level is detected at the upper position sequentially from the number of rotations for controlling the submersible pump when the water level is detected at the lower position. That is, as the water level rises, the number of rotations of the submersible pump is increased, and the discharge amount of the submersible pump can be increased. The submersible pump can be driven with a discharge capacity commensurate with the above.
[0031]
According to a third aspect of the present invention, in addition to the second aspect, when the control device further drives the submersible pump, and further outputs a warning signal when a detection signal is input from a water level sensor disposed at an upper limit position of the storage tank. Limitations are provided with abnormal alarm means for outputting, and stop means for outputting a stop signal for stopping driving of the submersible pump when a detection signal is input from a water level sensor disposed at a lower limit position of the storage tank. Submersible pump system.
[0032]
In the present invention, when the inflow amount of the wastewater flowing into the storage water tank exceeds the maximum discharge capacity of the submersible pump or the like, the abnormal state of the rise of the water level is output to the outside as an alarm to avoid the abnormal state for the worker. Action can be taken.
In addition, the operation of the submersible pump is stopped before the water level in the storage tank is discharged to the outside by the submersible pump and the water level drops, and the submersible pump reaches a water level at which the discharge cannot be performed. Can be prevented.
[0033]
According to a fourth aspect of the present invention, in addition to the features of the first aspect, the water level detector includes a plurality of water level sensors for detecting a position water level in the storage water tank, and the control device performs a predetermined operation when the water level in the storage water tank rises. Timer means for measuring the rise time of the water level between the water level sensors, total amount setting means for setting respective total amounts that can be present in the inflow pipe and the storage tank at the water level detection positions of the predetermined two water level sensors, and the total amount Calculating means for calculating the number of revolutions of the submersible pump according to a water level rising rate obtained by dividing the difference of the total amount set by the setting means by the water level rising time, based on a calculation result by the calculating means, A submersible pump system in which a control signal for controlling the rotation speed of the submersible pump by an inverter is output from a control device is limited.
[0034]
In this invention, the water level rise time between predetermined water level sensors is measured, and a value obtained by dividing the total amount of wastewater existing between the upper and lower water level sensors in the same water level sensor by the water level rise time is calculated as a water level rise rate. The submersible pump can be driven to rotate at a rotation speed corresponding to the water level rise rate.
[0035]
Accordingly, it is possible to control the submersible pump to be driven with a discharge capacity corresponding to the increase amount of the inflow water amount according to the rising speed of the water level, that is, according to the increase width of the inflow water amount. The total amount of drainage that may be present in the inflow channel pipe and the storage water tank at the water level detection position is previously calculated from the inner diameter of the inflow pipe, the gradient of the inflow pipe, and the horizontal cross-sectional area of the storage water tank, respectively. be able to.
[0036]
In addition, two water level sensors for measuring the water level rise time are selected from among the plurality of water level sensors so that another water level sensor is disposed above the two water level sensors, and the water level sensor is selected above the two water level sensors. When another arranged water level sensor detects the water level, it can be controlled so that the submersible pump is fully rotated at a discharge capacity of 100%. This makes it possible to cope with a sudden increase in the flow rate after the calculation of the inflow water amount.
[0037]
According to a fifth aspect of the present invention, in addition to the fourth aspect, an alarm signal is output when the control device further inputs a detection signal from the water level sensor disposed at an upper limit position of the storage tank when the submersible pump is driven. And a stop unit that outputs a stop signal to stop driving the submersible pump when a detection signal is input from a water level sensor disposed at a lower limit position of the storage tank. In a limited submersible pump system.
[0038]
According to the present invention, when the inflow amount of the wastewater flowing into the storage water tank exceeds the maximum discharge capacity of the submersible pump or the like, an alarm is issued to the outside to notify that the water level has risen and the water level has become an abnormal water level. Actions can be taken to avoid abnormal conditions. In addition, the submersible pump stops the drive of the submersible pump before reaching the water level where the drainage in the storage tank is discharged to the outside and the submersible pump cannot discharge, and the submersible pump also sucks air. Can be prevented.
[0039]
The invention according to claim 6 is a drive control of a submersible pump installed in a storage tank for stopping outflow to the downstream side and storing drainage flowing in from the upstream side, and discharging the drainage in the storage tank to the outside. A method comprising: outputting a warning to the outside by a detection signal indicating that the amount of drainage of the storage tank in the storage tank is equal to or higher than an upper limit position at which there is a risk of overflowing from the storage tank; The total amount that can be present in the inflow pipe and the storage water tank at the water level detection positions of the predetermined two water level sensors separated from each other is set, and the water level rise time between the two water level sensors is measured, The rotational speed of the submersible pump is calculated according to the water level rising rate obtained by dividing the difference of the set total amount by the measured water level rising time, and the submersible pump of the submersible pump is set to the rotational speed obtained by the calculation. rotation The drive control of the submersible pump, wherein the drive of the submersible pump is stopped by a detection signal indicating that the water level in the storage water tank has become equal to or lower than the lower limit position when the submersible pump is driven. In the way.
[0040]
In this invention, the drive control method of the submersible pump in the submersible pump system according to claim 5 is limited, and the rotation of the submersible pump can be controlled according to the detection state of the water level sensor when the water level rises. In addition, when the water level drops after the operation of the submersible pump, the submersible pump does not suck the drainage and the submersible pump can be stopped before idling, so that the submersible pump can be operated stably. it can.
Further, it is possible to detect an abnormal water level at which there is a danger of drainage overflowing from the storage water tank despite the discharge operation of the submersible pump, and to issue an alarm of an abnormal state.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the accompanying drawings. The present invention provides a method for cleaning, inspecting, repairing, and replacing sewer pipes buried underground so as to prevent sewage and the like from flowing into the work section. The present invention can be effectively applied as a submersible pump system installed in a manhole or the like on the upstream side of a sewer pipe in which a water pipe is stopped and a closed water pipe, and a drive control method of the submersible pump.
[0042]
In addition, as the submersible pump used as the submersible pump system and the drive control method of the submersible pump of the present invention, in addition to the submersible pump installed in the above-described manhole, for repairing and repairing the canals of agricultural water and the like, the canals are used. A submersible pump installed in an aquarium basin arranged on the way, a submersible pump installed in a manhole for pumping sewage to a sewage treatment plant, or a fluid that flows in from the upstream side and temporarily stores fluid that has flowed in In addition, a submersible pump or the like for discharging and discharging downstream can be used, and the submersible pump system and the drive control method of the submersible pump of the present invention can be applied to these submersible pumps.
[0043]
FIG. 1 is a schematic diagram of a submersible pump system according to a first embodiment of the present invention. The manhole 1 is connected to the inflow pipe 4 on the upstream side and the discharge pipe 5 on the downstream side. The sewage such as sewage which has flowed into the manhole 1 from the inflow pipe 4 flows out through the manhole 1 to the downstream discharge pipe.
[0044]
In FIG. 1, when performing a replacement work or the like of a sewage pipe (not shown) on the downstream side of the discharge pipe 5, a water stopcock 7 is installed in the drain pipe 5 and the sewage pipe performing the replacement work or the like is connected to the manhole 1. The figure shows a state in which sewage is set not to flow out of the system. In the manhole 1, a submersible pump 2 for discharging sewage as drainage flowing from an inflow pipe 4 to the outside of the manhole 1 is installed. The submersible pump 2 is connected to a pumping pipe 3 communicating with a discharge port of the submersible pump 2. The suctioned waste water is connected to a bypass pipe that bypasses a sewer pipe for downstream replacement work. The water stopcock 7 is made of a flexible material such as rubber, and expands and deforms by the inflow of air or the like, and is configured to be pressure-bonded to the inner peripheral surface in the pipe.
[0045]
A relay pump 10 can be provided between the pumping pipe 3 and the bypass pipe as needed. In the manhole 1, float switches 8a to 8e as water level detectors for detecting the water level of the wastewater flowing from the inflow pipe 4 are arranged at predetermined intervals. In the following description, an example in which a float switch is used as a water level detector for detecting a water level will be described. However, in the present invention, the water level detector is not limited to a float switch, and can detect various water levels. A water level detector can be used. As the water level detector, any type of contact type or non-contact type water level detector can be used, but as the water level detector, it is necessary to use a non-contact type water level detector. It is also desirable from the viewpoint of preventing malfunction due to attachment of a kimono or the like.
[0046]
The detection signal from the float switch 8 is input to the control device 9, and the control device 9 controls the inverter of the submersible pump 2 according to the input detection signal. The float switch 8 is suspended by its own weight in the atmosphere located above the water level in the manhole 1, and the wastewater flows into the manhole 1. When the water surface of the wastewater reaches the float switch 8, the float switch 8 8 floats on the surface of the drainage water. When the float switch 8 changes its posture, it is possible to detect that the drainage has reached a predetermined water level detected by the float switch 8. If the water level of the wastewater continues to rise, the float switch 8 that has detected the water level will be immersed below the water surface.
[0047]
The float switch 8 is provided with a micro switch that operates by tilting the float case inside the float case as generally used, and the micro switch is housed in a watertight state by the float case and has an insulating coating. The lead wire is connected to a water-tight lead wire, and the lead wire is connected to a control device. For this reason, the microswitch part and the lead wire of the float switch 8 can detect the water level of the wastewater in a non-contact state with the wastewater.
[0048]
The float switch 8 has an a contact that turns on when the float switch 8 floats on the water surface and a b contact that turns off the switch. The lead wire is selected by selecting the b contact. In the present invention, it is desirable to select the contact b since the signal from the float switch 8 can be detected even when the wire is disconnected.
[0049]
The float switch 8a is arranged as a lower limit water level sensor, and operates when the float switch 8a rises above the water surface due to rising water level of the drainage. When the b contact is selected as the float switch 8a, the float switch 8a is floated when the float switch 8a is operated. The state in which no current flows through the lead wire connected to the switch 8a, that is, the current flowing through the lead wire is turned off. At this time, it is possible to determine that the water level of the waste water has reached the water level at the lower limit position by detecting, by the control device, a state in which the current flowing through the float switch 8a has stopped flowing. Further, when the water surface is lowered due to the discharge of the drainage by the submersible pump 2, the float switch 8a is turned on, that is, a current flows at the contact b, and the control device detects a state where the current flows to the lead wire. Sometimes, a signal for stopping the driving of the submersible pump 2 is output. Thereby, it is possible to prevent the idle operation in which the water level becomes equal to or lower than the suctionable water level of the submersible pump 2 and the submersible pump sucks air.
[0050]
Similarly, in each of the float switches 8b to 8e, the water level of the drainage can be detected by detecting whether or not a current is flowing through the lead wire connected to each of the float switches 8b to 8e. An example in which five float switches are used as float switches will be described. However, the number of float switches is not limited to five, and the present invention can be configured by using at least two or more float switches. .
[0051]
The float switch 8e is arranged as an upper limit water level sensor. When the water level of the drain reaches the position where the upper limit water level sensor is disposed, the float switch 8e detects the abnormal water level at which the discharge amount of the submersible pump 2 exceeds the inflow amount of the waste water and cannot drain the water. When the abnormal water level is detected, the control device outputs an alarm to the outside. As the output of the alarm, an alarm sound can be emitted, or an abnormal state can be notified to a predetermined place using a wireless communication system, a telephone communication system, or the like.
[0052]
The operation of the float switches 8a to 8d is controlled so that the rotation speed of the submersible pump 2 is set in advance when each of the float switches 8a to 8d is operated. The operation of the submersible pump 2 can be started when the float switch 8a operates, or can be started when the float switch 8b and below operate. When the water level detected by the float switch 8a is set low and the submersible pump 2 is operated immediately when the float switch 8a is activated, the water level of the drainage immediately decreases depending on the inflow amount of the wastewater flowing into the manhole 1 and the submersible pump. May be stopped. In such a state, the submersible pump 2 repeatedly starts and stops, so that the submersible pump 2 cannot be driven stably and the life of the submersible pump 2 is shortened. For this reason, it is desirable to operate the submersible pump after a predetermined amount of drainage has accumulated.
[0053]
The float switches 8a to 8d start the operation of the submersible pump 2 when the float switches 8a are activated, for example, and operate the submersible pump 2 when the switches detect the water level. %, When the float switch 8b is activated, the same 50% rotation is performed, when the float switch 8c is activated, the same 70% rotation is performed, and when the float switch 8d is activated, the same rotation is performed. It can be controlled to perform 100% rotation. Further, when the float switch 8e, which is the upper limit water level sensor, is operated, an alarm for notifying an abnormality or the like is output to the outside while the rotation of the submersible pump is maintained at the operation state of 100%.
[0054]
When the submersible pump 2 is driven to lower the water level after the water level of the drainage rises and the float switch 8d operates, for example, the rotation speed of the submersible pump 2 is changed until the float switch 8a detects the lowering of the water level. It is desirable to maintain 100% rotation corresponding to. When the water level of the drainage water drops from the water level of the throat switch 8d to the water level of the float switch 8c due to the drainage of the submersible pump 2, the rotation of the submersible pump 2 can be reduced from 100% to 70%. In order to always keep the water level at or below the lower limit water level, it is desirable to continue the drainage of the submersible pump in a state of 100%.
[0055]
When the water level falls after the detection of the water level by the other float switches 8b to 8c, it is desirable to maintain the rotation speed of the submersible pump 2 set by the respective float switches 8b to 8c. By doing so, even if the amount of inflow suddenly increases due to heavy rain or the like, it is possible to store the inflow in the manhole.
[0056]
The operation of the submersible pump 2 by the operation of the float switches 8a to 8e will be described with reference to FIG. In step 1, the pump capacity of the submersible pump 2 installed in the manhole is set. Selection of pump capacity depends on the work period on the downstream side, past rainfall data at the time of work, etc., the inside diameter and volume of the manhole, the inside diameter of the inflow pipe on the upstream side, and the installation gradient. In this case, the maximum inflow amount to be inflowed in advance can be predicted in advance and selected by an appropriate method such as using a submersible pump having a discharge capacity capable of coping with the inflow amount.
[0057]
In step 2, the installation positions of the float switches 8a to 8e are set, and the rotation speed of the submersible pump when each of the float switches 8a to 8e is operated is set.
[0058]
In step 3, a selection is made as to whether to manually operate the submersible pump or to perform automatic operation based on the detection results of the float switches 8a to 8e.
[0059]
In step 4, when the manual operation is selected, the rotation control of the submersible pump is performed by the operator. At this time, while the operator monitors the presence or absence of a detection signal from each float switch, the rotation of the submersible pump can be controlled according to the detection signal.
[0060]
Step 5 is a case in which the automatic operation is selected. In step 6 and subsequent steps, the fact that the submersible pump is being automatically operated is displayed on a control device or the like by using a lamp or the like.
[0061]
In step 6, it is determined whether or not the float switch 8a, which is the lower limit water level switch, is operated. When the b-contact, which is disconnected when the float switch is tilted, is selected as the float switch, the operation of the float switch 8a, that is, the operation off state of the float switch 8a, is determined by the water level at which the float switch 8a rises. This shows a state where the current flowing through the lead wire connected to the microswitch in the switch is cut off. (The same applies to the following float switches 8b to 8e.)
[0062]
In step 7, when it is detected that the operation of the float switch 8a is turned on, that is, when the water level of the drainage falls below the lower limit water level, the drive of the submersible pump is stopped, and the process returns to step 6.
[0063]
In step 8, when it is detected that the float switch 8a is turned off, the low speed operation of the submersible pump 2 is started.
[0064]
In Step 9, when the submersible pump 2 performs low-speed operation and the inflow of drainage is larger and the water level rises, when the float switch 8b detects the water level, the submersible pump 2 The medium speed operation is performed to increase the discharge amount of the submersible pump. When the float switch 8b does not detect the water level, the process returns to step 6.
[0065]
In step 11, it is determined whether or not the water level has dropped when the submersible pump 2 has been operated at a medium speed, and has dropped below the lower limit water. That is, when the float switch 8c is turned off, the process proceeds to step 12, where the high-speed operation of the submersible pump is performed. When the float switch 8c remains on, the process returns to step 6.
[0066]
In step 13, when the float switch 8d detects that the water level has risen despite the high speed operation of the submersible pump, the submersible pump is operated at the highest speed, that is, 100% of the pump discharge capacity, in step 14. When the float switch 8d is in the on state in which the water level is not detected, the process returns to step 6.
[0067]
In step 15, despite the maximum speed operation of the submersible pump, when the water reaches the upper limit water level, which is a dangerous water level at which drainage may overflow from the manhole, the maximum speed operation of the submersible pump is maintained. Notify the outside of the warning of abnormal water level.
[0068]
In step 17, when the water level abnormal state is avoided or processed by other methods, when the water level drops, when no system abnormality is detected separately, or when no manual operation is performed, step 6 is performed. Return to and continue the automatic operation.
[0069]
In step 18, when the pump stop command is input, the operation of the submersible pump is stopped.
[0070]
Although not specifically described in each of the above steps, a state that does not originally occur, for example, when the float switch 8a or the like disposed above the float switch 8a is turned off while the float switch 8a serving as the lower limit water level sensor is on. In such cases, the safety of the submersible pump system can be enhanced by sending an alarm to the outside.
[0071]
A second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the other configuration is the same as that of the first embodiment except that the drive control method of the submersible pump by the float switch is different, so that the same configuration is the same as the member code in the first embodiment. The description is replaced by the use of the member code.
[0072]
In the first embodiment, an example in which five float switches are used is shown. In the second embodiment, a case in which four float switches are used will be described. The number of float switches is not limited to four, and the present invention can be configured by using at least two or more float switches. In addition, an example in which a float switch is used as a water level detector will be described. However, the water level detector is not limited to a float switch, and a known water level detector may be used as long as the water level in a manhole can be detected. Can be used.
[0073]
The float switch 18a for detecting the lower limit water level is set to a contact b similarly to the float switch 8a in the first embodiment, and detects the rise of the water level from the lower limit water level and, when detecting the fall of the water level, switches the submersible pump. Outputs a detection signal for stopping driving. When the float switch 18a detects a rise in the water level, the control device 9 starts timing. The water level rises with the increase of the inflow of the wastewater, the time until the water level of the wastewater reaches the detection water level of the float switch 18b is measured, and the operation of the submersible pump is started by the operation of the float switch 18b. At this time, the control device 9 records the elapsed time from the start of timing of the float switch 18a to the end of timing of the float switch 18b, and calculates or calculates in advance the total amount of drainage between the float switch 18a and the float switch 18b. The total amount is read out and the increase rate of the inflow amount per unit time is calculated.
[0074]
As shown in FIG. 3, the total amount of drainage between the float switch 18a and the float switch 18b is calculated based on the inflow water amount (oblique oblique line) at the water level 11b when the float switch 18b is activated, and the water level when the float switch 18a is activated. It can be obtained by subtracting the inflow water amount (cross-hatched line) at the level 11a. When the float switch 18b is actuated, the amount of inflow of drainage is determined by the cross-sectional area of the manhole, the distance between the float switch 18b and the float switch 18a, the inner diameter of the inflow pipe, the gradient of the inflow pipe, and the like. Can be obtained, and the total amount of these can be obtained in advance.
[0075]
In accordance with the rate of increase of the inflow amount per unit time, that is, the rise in water level obtained by dividing the difference in the total amount of inflow after the operation of the float switch 18a by the elapsed time, for example, the rise rate of water level is 3 m ³ / Mim or less, the rotation of the submersible pump is set to 30% of the discharge capacity, and the water level rise rate is 3 m ³ 7m from / mim ³ / Mim or less, the rotation of the submersible pump is set to 50% of the discharge capacity, and the water level rise rate is 7 m ³ When the speed is equal to or more than / mim, the rotation of the submersible pump can be set to be 70% of the discharge capacity.
[0076]
After the submersible pump is driven at the set number of revolutions, the set number of revolutions is maintained until the submersible pump stops and the rotation of the submersible pump is controlled. For example, after the float switch 18b detects the water level and turns off, if the submersible pump is rotationally controlled in accordance with the water level rise rate of the inflow per unit time, the water level once turns on the float switch 18b. After descending to the state, it rapidly increases due to heavy rain or the like, and even if the float switch 18b is turned off again, the rotation speed controlled by the current detection signal from the float switch 18b is maintained. To maintain the rotation of the submersible pump 2. When the water level falls below the lower limit water level by driving the submersible pump 2, the driving of the submersible pump is stopped.
[0077]
If the water level is detected by the float switch 18c without a drop in the water level despite the driving of the submersible pump 2, the submersible pump is driven 100%. When the submersible pump is driven 100%, the water level does not drop and the float switch 18d that detects the upper limit water level detects the water level. When the float switch 18d detects the water level, it issues an alarm to the outside of the water level and rotates the submersible pump 2 at 100%. Let it.
[0078]
In the above case, when the water level falls below the lower limit water level, that is, when the float switch 18a is turned on, the driving of the submersible pump 2 is stopped.
[0079]
Further, when a signal that is normally impossible is input to the control device, for example, even though the float switch 18a for detecting the lower limit water level is in the on state, the float switches 18b to 18d disposed above it are in the off state. In such cases, an abnormal condition is alerted to the outside as an abnormality of the water level detector.
[0080]
A control flowchart in the second embodiment will be described with reference to FIG.
[0081]
In step 1, the capacity of the pump installed in the manhole is set. The pump capacity is selected based on the work period on the downstream side, the past rainfall data during the work time, etc., the inside diameter and volume of the manhole, the inside diameter of the inlet pipe on the upstream side, and the installation gradient. It is possible to predict the maximum inflow amount when water flows in and to select it by an appropriate method, such as using a submersible pump 2 having a discharge capacity capable of coping with the inflow amount.
[0082]
In step 2, the installation positions of the float switches 18a to 18d are set, and the total amount of wastewater in each of the float switches 18a and 18b, that is, the amount of wastewater present below the surface of the wastewater is determined by the inner diameter of the manhole, the inner diameter of the inflow pipe, the inclination gradient, It is calculated based on the distance between the float switches 18a and 18b and stored. Further, based on the rise time when the water level rises from the float switch 18a to the float switch 18b, the flow rate increase rate per unit time, that is, the rotation speed of the submersible pump is driven by what percentage according to the value of the water level rise rate. Is set in advance.
[0083]
In step 3, a selection is made as to whether to manually operate the submersible pump or to perform automatic operation based on the detection results of the float switches 18a to 18e.
[0084]
In step 4, when the manual operation is selected, the lamp during the manual operation is turned on, and the rotation control of the submersible pump is manually performed by the operator. At this time, while the operator monitors the presence or absence of a detection signal from each float switch, the rotation of the submersible pump can be controlled according to the detection signal.
[0085]
Step 5 is a case where the automatic operation is selected, and in step 6 and subsequent steps, the fact that the submersible pump is being automatically operated is displayed on a control device or the like by using a lamp or the like.
[0086]
In step 6, it is determined whether or not the float switch 18a, which is the lower limit water level switch, is operated. When the float switch 18a is selected as the float switch, the contact is disconnected when the float switch is inclined. When the float switch 18a is turned off, that is, when the float switch 18a is in the off state, the lead wire connected to the micro switch in the float switch is used. Shows the state where the current flowing through the switch is cut off (the same applies to the following float switches 18b to 18e). The detection is repeated until the float switch 18a is drooped by its own weight and becomes an on state in which a current flows through the lead wire.
[0087]
In step 6, when it is detected that the float switch 18a is turned off, in step 7, the control device starts timing.
[0088]
In Step 8, when the elapsed time from the start of the time measurement exceeds a predetermined time, that is, when the water level is not increased further by merely turning off the float switch 18a, In step 9, the submersible pump 2 is operated at a preset low speed.
[0089]
In step 10, it is detected whether the water level has reached the lower limit position water level, whether the float switch 18a has been turned on. When the float switch 18a is turned on, the process proceeds to step 22 to stop the operation of the submersible pump 2, and returns to step 6. When the float switch 18a is off, step 10 is repeated.
[0090]
In step 11, it is determined whether the float switch 18b has been turned off. When the float switch 18b is on, the process returns to step S8. When the float switch 18b is off, the process proceeds to Step 12.
[0091]
In step 12, the increase rate of the inflow amount per unit time and the water level rise rate are calculated from the elapsed time until the float switch 18b is turned off and the total amount of wastewater recorded in advance in step 2, The drive of the submersible pump is controlled in step 13 so that the number of rotations is set in accordance with the water level rise rate set in advance according to the calculation result.
[0092]
In step 14, when the float switch 18c is turned off to indicate that the water level has risen despite the driving operation of the submersible pump, in step 16, the submersible pump is operated at the highest speed, that is, at 100%. When the float switch 18c is on, the process proceeds to step 15, where it is determined whether or not the water level has been lowered by driving the submersible pump and has fallen below the lower limit water level (the float switch 18a is turned on). When the water level of the waste water becomes equal to or lower than the lower limit water level in step 15, the operation proceeds to step 22 to stop the operation of the submersible pump 2, and returns to step 6.
[0093]
In step 17, it is determined whether or not the upper limit water level, which is a dangerous water level at which drainage may overflow from the manhole, has been reached despite the highest speed operation of the submersible pump. That is, when the float switch 18d is turned off, the maximum speed operation of the submersible pump is maintained, and in step 19, an alarm indicating an abnormal water level is notified to the outside. When the float switch 18d is on, the process proceeds to step 18, where it is determined whether the water level has dropped to the lower limit water level.
[0094]
In step 18, when the float switch 18a is turned on, the process proceeds to step 22, in which the operation of the submersible pump 2 is stopped, and the process returns to step 6. When the float switch 18a is off, the process returns to step S17.
[0095]
In step 20, after the abnormal water level is avoided or processed by other methods, when the water level drops, no abnormality of the system is detected separately, or when no manual operation is performed, step 18 is executed. Return to and continue the automatic operation.
[0096]
In step 21, when the pump stop command is input, the operation of the submersible pump is stopped.
[0097]
Although not specifically described in each of the above steps, a state that does not originally occur, for example, when the float switch 18b disposed above the float switch 18a is turned off while the float switch 18a serving as the lower limit water level sensor is on. In such cases, the safety of the submersible pump system can be enhanced by sending an alarm to the outside.
[0098]
Thus, the submersible pump can be controlled at a rotational speed corresponding to the rate of rise of the water level according to the rate of rise of the water level when the water level rises. In addition, it is possible to drive and control the submersible pump in an optimal state according to the amount of inflow into the manhole.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a flowchart of control in the first embodiment of the present application.
FIG. 3 is a schematic view showing a second embodiment of the present invention.
FIG. 4 is a diagram illustrating a flowchart of control in a second embodiment of the present application.
FIG. 5 is a schematic view of a submersible pump installed in a manhole in a conventional example.
6 is a diagram showing the amount of inflow in the manhole in FIG. 5 in a time-series manner.
FIG. 7 is a schematic view of a submersible pump installed in a manhole in another conventional example.
[Explanation of symbols]
1 Manhole
2 Submersible pump
3 Pumping pipe
4 Inflow pipe
5 Outflow pipe
7 Stopcock
8 Float switch
8a-8e Float switch
9 Control device
10 Relay pump
11a, 11b Water level
21 Manhole unit body
22 pump
23 Upstream sewer pipe
24 Discharge pipe
25 Downstream sewer pipe
26 Pump drive water level detection sensor
27 Pump stop water level detection sensor
28 Set water level detection sensor
29 Control device
31 Manhole
32 Inflow pipe
33 Liquid level detection sensor
34, 35 pump
38 PC
W _H Pump drive water level
W _L Pump stop water level
W _S Set water level

Claims (6)

A submersible pump provided in a storage tank, which stores wastewater flowing from an inflow pipe and discharges wastewater downstream from an outflow pipe;
A pumping pipe connected to the outlet of the submersible pump,
A downstream stopcock provided in the outflow pipe,
A water level detector that detects a plurality of water levels in the storage water tank,
A control device that receives a detection signal from the water level detector and controls a discharge amount of the submersible pump according to the detection signal,
With
The control device outputs a control signal for controlling the number of rotations of the submersible pump according to a rising water level of drainage stored in the storage water tank,
The number of rotations of the submersible pump is inverter-controlled by the control signal,
A submersible pump system wherein the drainage in the storage tank is discharged to the outside through the pumping pipe by the submersible pump controlled by the inverter. The control device, according to each detection signal corresponding to a plurality of water levels from the water level detector, has a setting means that can be set in advance the number of rotations of the submersible pump, and, in the storage tank 2. The control signal according to each of the detection signals input from the water level detector when the water level rises, the control signal having the rotation speed set by the setting means is output to the submersible pump. The submersible pump system as described. When the control device drives the submersible pump, further, when a detection signal is input from the water level sensor disposed at an upper limit position of the storage tank, an abnormality alarm unit that outputs an alarm signal, and a lower limit position of the storage tank. Stop means for outputting a stop signal to stop driving the submersible pump when a detection signal is input from a water level sensor disposed in
The submersible pump system according to claim 2, comprising: The water level detector includes a plurality of water level sensors for detecting a position water level in the storage tank,
The control device, when the water level in the storage water tank rises, a timer means for measuring a water level rise time between the predetermined water level sensors,
Total amount setting means for setting respective total amounts that can be present in the inflow pipe and the storage water tank at the water level detection position with the predetermined two water level sensors,
Calculating means for calculating the number of revolutions of the submersible pump according to a water level rising rate obtained by dividing the difference of the total amount set by the total amount setting means by the water level rising time;
Has,
2. The submersible pump system according to claim 1, wherein a control signal for inverter-controlling the rotation speed of the submersible pump is output from a control device based on a calculation result by the calculating unit. 3. When the control device drives the submersible pump, further, when a detection signal is input from the water level sensor disposed at an upper limit position of the storage tank, an abnormality alarm unit that outputs an alarm signal, and a lower limit position of the storage tank. Stop means for outputting a stop signal to stop driving the submersible pump when a detection signal is input from a water level sensor disposed in
The submersible pump system according to claim 4, comprising: A drive control method of a submersible pump that stops outflow to the downstream side, is installed in a storage tank for storing drainage flowing in from the upstream side, and discharges drainage in the storage tank to the outside,
A detection signal indicating that the amount of drainage of the storage tank in the storage tank is equal to or higher than an upper limit position at which there is a risk of overflowing from the storage tank, outputs an alarm to the outside,
The total amount that can be present in the inflow pipe and the storage water tank at the water level detection positions of the predetermined two separate water level sensors disposed in the storage water tank, respectively, is set,
Measure the rise time of the water level between the two water level sensors,
Calculate the rotation speed of the submersible pump according to the water level rise rate obtained by dividing the difference of the set total amount by the measured water level rise time,
Inverter control the rotation speed of the submersible pump so that the rotation speed obtained by the calculation,
At the time of driving the submersible pump, by the detection signal indicating that the water level in the storage water tank is below the lower limit position, to stop driving the submersible pump,
A drive control method for a submersible pump.

Images