JP2010236191A - Controller for submerged pump, manhole pump device, and control method for the submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller for a submerged pump, capable of detecting an operation state of an automatic cut-off without taking out an auxiliary contact signal and controlling the submerged pump properly even if the submerged pump incorporates an electric motor constituted by providing the automatic cut-offs in series in an armature winding and to provide a manhole pump device and a control method for the submerged pump. <P>SOLUTION: This controller for the submerged pump includes a pressure feed control unit for operating an electromagnetic opening and closing device and driving the submerged pump when a level of water stored/detected by a water level sensor reaches the level of water for starting the pump and an abnormality determining part for determining the presence or absence of abnormality based on the operation state of the electromagnetic opening and closing device for driving the electric motor, a state detected with a current sensor for detecting current in a feeder connected with the armature winding through the electromagnetic opening and closing device, and a level of water stored. The abnormality determining part determines that abnormality due to the excessive heating of the electric motor while operating the automatic cut-off occurs if current is not detected with the current sensor during operation of the electromagnetic opening and closing device and reduction of the level of water stored is not detected with the water level sensor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a control device and a control method for a submersible pump in which an electric motor in which an autocut is interposed in series in an armature winding and pumps stored water flowing into a water storage tank to an outflow pipe, and more particularly, to a sewage inflow The present invention relates to a control device suitable for a submersible pump installed in a manhole storing sewage flowing in from a pipe and pumping the sewage stored in the manhole to a sewage outflow pipe, a manhole pump device, and a control method for the submersible pump.

  When foreign matter is caught in the submersible pump, the rotating blades are locked, and an abnormal current may flow through the armature winding of the motor that drives the pump, causing burning. For this reason, a thermal switch is usually installed in the vicinity of the armature winding, the contact signal of the thermal switch is taken out to the control panel, and when the abnormal overheating state of the armature winding is detected based on the contact signal, the motor is driven. The control part which forcibly interrupts | releases the electromagnetic switch to perform is provided.

  However, a small submersible pump with a small current capacity has a built-in motor with autocuts inserted in series in the armature winding, so a contact signal can be obtained to detect whether autocuts are operating. The water storage tank might overflow.

  Therefore, Patent Document 1 discloses a thermal protector that includes a main contact that responds to an excessive current value flowing through the motor incorporated in the motor or an increase in the ambient temperature and opens when the temperature reaches a predetermined temperature. An electric motor protection device configured to shut off the main circuit of the electric motor when the main contact of the thermal protector is opened, and is an auxiliary contact that is closed or opened when the main contact of the thermal protector is opened And a motor protection device provided with a reporting means for reporting to the outside that the main circuit of the motor has been shut off by closing or opening the auxiliary contact.

JP 2007-28736 A

  However, in order to extract the auxiliary contact signal described in Patent Document 1 to the outside of the electric motor, a signal line other than the power supply line to the armature winding is required, and the signal is sent to the control panel installed outside the water storage tank. There is a problem that the construction labor for wiring is increased and the cost of the submersible pump is also increased.

  Even if this invention is a submersible pump in which an electric motor with an autocut interposed in series in an armature winding is incorporated, the operation state of the autocut is detected without taking out an auxiliary contact signal and properly controlled. It is an object to provide a submersible pump control device, a manhole pump device, and a submersible pump control method.

  In order to achieve the above-mentioned object, the first characteristic configuration of the submersible pump control device according to the present invention is that an automatic cut is connected in series with the armature winding as described in claim 1 of the claims. A submersible pump control device that incorporates an installed electric motor and pumps the stored water flowing into the water tank to the outflow pipe, and activates the electromagnetic switch when the stored water level detected by the water level sensor reaches the pump activation water level The operation state of the pressure feed control unit that drives the submersible pump, the operating state of the electromagnetic switch that drives the electric motor, and the detection state of the current sensor that detects the current of the feeder line connected to the armature winding via the electromagnetic switch And an abnormality determination unit that determines whether or not there is an abnormality based on the stored water level detected by the water level sensor, and the abnormality determination unit detects that no current is detected by the current sensor during operation of the electromagnetic switch, and the water level sensor Yo When reduction of the reservoir water level is not detected, in that it determines that the electric motor overheat the automatic cutting is operating.

  According to the above-described configuration, in the state where the electromagnetic switch is operated by the pumping control unit and the submersible pump is driven, no current is detected by the current sensor by the abnormality determination unit, and the stored water level is lowered by the water level sensor. If it is not detected, it is determined that the motor cuts abnormally because the auto cut is activated and the submersible pump is stopped, so it is determined that the auto cut is activated based on the double determination of the output of the current sensor and the water level sensor. It becomes possible to judge high.

  In the second characteristic configuration, as described in claim 2, in addition to the first characteristic configuration described above, the abnormality determination unit is configured such that the current is not detected by the current sensor during operation of the electromagnetic switch, When a decrease in the stored water level is detected by the sensor, the current sensor is determined to be abnormal.

  According to the above-described configuration, in the state where the electromagnetic switch is operated by the pumping control unit and the submersible pump is driven, no current is detected by the current sensor by the abnormality determination unit, and the stored water level is lowered by the water level sensor. When it is detected, it is determined that the submersible pump is being driven properly and it is determined that an abnormality has occurred in the current sensor. Therefore, the abnormality of the current sensor can be detected without providing a separate sensor. It becomes like this.

  In addition to the first or second feature configuration described above, the third feature configuration is provided in the water tank whenever the stored water level reaches the pump activation water level. When one of a plurality of installed submersible pumps is controlled to be driven alternately, and the submersible pump being driven is determined to be an overheating abnormality of the motor in which auto cut is activated by the abnormality determining unit, another submersible pump It is in the point to switch to.

  When multiple submersible pumps are normal, any one of the multiple submersible pumps is driven alternately each time the stored water level reaches the pump activation level by the pumping control unit. The problem of the imbalance of the life of a plurality of submersible pumps that occurs in the case where the operation is performed, when the submersible pump being driven is determined to be an abnormal motor overheating with the auto cut operating by the abnormality determination unit, Since it can be switched to another submersible pump, the stored water can be properly pumped to the outflow pipe, and the possibility that the water storage tank overflows can be reduced.

  In the fourth feature configuration, in addition to the third feature configuration described above, the pressure control unit is installed in the water tank every time the stored water level reaches the pump starting water level. Control is performed so that any of a plurality of submersible pumps are driven alternately, and the submersible pump being driven is determined by the abnormality determination unit to be overheated abnormally in the motor, and then the stored water level becomes the pump activation water level. When it reaches, it is in the point which drives other submersible pumps preferentially.

  According to the above-described configuration, when the submersible pump being driven is determined to be an overheating abnormality of the motor in which the auto-cut is operating by the abnormality determination unit, and the stored water level reaches the pump activation water level, the auto-cut control unit performs the automatic cut. Since other submersible pumps, which are different from the submersible pumps that were operating, are preferentially driven, the operation opportunities of submersible pumps that are in an abnormal state in which automatic cuts are frequently activated are reduced and stable storage is possible. The water can be pumped to the outflow pipe.

  In the fifth feature configuration, in addition to the third feature configuration described above, the pumping control unit is installed in the water tank every time the stored water level reaches the pump starting water level. When one of a plurality of submersible pumps is controlled to be driven alternately, and the submersible pump being driven is determined to be overheated by the abnormality determining unit and the motor is overheated, it is detected by a water level sensor. The other submersible pumps are preferentially driven until the operation stop time of the pumps defined based on the water level is reached.

  Similar to the above, the submersible pump with the auto cut activated is in an overheated state for some reason, and must be naturally cooled by being stopped. How long the main body of the submersible pump is cooled varies depending on the water level. For example, if the electric motor of the submersible pump is submerged, it is cooled faster, and if it is not submerged, the cooling time is longer. Therefore, the pressure feed control unit determines that the cooling is insufficient until the operation stop time of the pump specified based on the water level detected by the water level sensor elapses, and gives priority to other submersible pumps. Driving the water pump promotes cooling of the submersible pump in which the auto cut is activated.

  In addition to any of the first to fifth feature configurations described above, the sixth feature configuration reports an abnormality to the outside when it is determined to be abnormal by the abnormality determination unit. The communication unit is provided.

  According to the above-described configuration, when an abnormality is determined by the abnormality determination unit, an abnormality is notified to the outside via the communication unit.For example, an auxiliary contact that is closed or opened when an auto-cut contact is opened on the motor is provided. An abnormality can be detected without taking out an auxiliary contact signal indicating an auto-cut state, such as wiring a signal line for transmitting an auxiliary contact signal indicating the closed or open state of the auxiliary contact to the outside. It becomes like this.

  In addition to any one of the first to sixth feature configurations described above, the seventh feature configuration of the seventh aspect is that, in addition to the first to sixth feature configurations described above, the submersible pump supplies sewage flowing from a sewage inflow pipe to a water storage tank. The manhole pump is equipped with a submersible pump controller that controls the submersible pump that controls the submersible pump that is installed in the manhole that stores the influent sewage and that pumps the sewage stored in the manhole to the sewage outflow pipe. It is very suitable for.

  The first characteristic configuration of the submersible pump control method according to the present invention is as described in claim 8, in which a motor in which an automatic cut is interposed in series in an armature winding is incorporated, and the storage that has flowed into the water tank A submersible pump control method for pumping water to the outflow pipe, wherein when the stored water level detected by the water level sensor reaches the pump start water level, the electromagnetic pump is operated to drive the submersible pump, and the electric motor Based on the operating state of the electromagnetic switch to be driven, the detection state of the current sensor that detects the current of the power supply line connected to the armature winding via the electromagnetic switch, and the stored water level detected by the water level sensor, If no current is detected by the current sensor while the electromagnetic switch is in operation, and if a drop in the stored water level is not detected by the water level sensor, it is determined that the motor has been overheated abnormally. In the pumping control step, every time the stored water level reaches the pump activation water level, one of a plurality of submersible pumps installed in the water tank is alternately driven, and the driving submersible pump is in an abnormality determination step. If it is determined that the motor is overheated and the auto cut is activated, a switching step for switching to another submersible pump is performed.

  In the second feature configuration, in addition to the first feature configuration described above, in addition to the first feature configuration described above, a communication step for notifying the outside when an abnormality is determined in the abnormality determination step is executed. It is in.

  As described above, according to the present invention, even in a submersible pump in which an electric motor having an autocut interposed in series in an armature winding is incorporated, the autocut operating state can be maintained without taking out an auxiliary contact signal. It is possible to provide a submersible pump control device, a manhole pump device, and a submersible pump control method that can be detected and appropriately controlled.

Schematic of a manhole pump device with a control device installed Configuration diagram of control device and submersible pump Flow chart of submersible pump pressure control by the pressure controller Flow chart of abnormality determination control of submersible pump by abnormality determination unit Flowchart of pumping control that expands the pumping control of the submersible pump by the pumping control unit shown in FIG. Flowchart of pumping control that expands the pumping control of the submersible pump by the pumping control unit shown in FIG.

  Below, the control apparatus and control method of the submersible pump by this invention are demonstrated to the example of the submersible pump installed in the manhole pump apparatus.

  As shown in FIG. 1, the manhole pump device 10 includes a manhole 12 that stores sewage flowing in from the sewage inflow pipe 11 a, a submersible pump 13 that pumps the sewage stored in the manhole 12 to the sewage outflow pipe 11 b, and a manhole 12. A water level sensor 14 that measures the water level of the sewage stored in the tank and a control device 20 that controls the submersible pump 13 based on a signal from the water level sensor 14 are provided.

  The water level sensor 14 is an injection pressure type or bubble type water level sensor and is installed at the bottom of the manhole 12 so as to continuously detect the level of sewage stored in the manhole 12. Further, in preparation for failure of the water level sensor 14, a backup float type water level sensor 15 is installed at a height at which the water level sensor 14 becomes abnormally high, and the water level sensor 14 and the water level sensor 15 detect the abnormally high water level. .

  The manhole pump device 10 is provided with two submersible pumps 13 for malfunction or maintenance. When an abnormally high water level occurs, two manhole pumps 10 are operated simultaneously to increase the pumping amount of sewage.

  The number of submersible pumps 13 installed in the manhole pump device 10 is not limited to two, and a larger number of submersible pumps 13 may be installed. If an abnormally high water level occurs, the pumping amount of sewage is reduced. Multiple units are operated simultaneously to increase the number.

  Each submersible pump 13 includes a rotary blade built in a casing, a main shaft that rotates the rotary blade, and an electric motor that rotationally drives the main shaft. The submersible pump 13 discharges sewage sucked from the suction port and is connected to the discharge port. It is comprised so that it may pressure-feed to the sewage outflow pipe 11b.

  As shown in FIG. 2, an autocut 32 is interposed in series in the armature winding 31 (31u, 31v, 31w) of the electric motor 30, and an abnormal current flows through the armature winding 31 and is overheated. Then, the auto cut 32 is activated to cut off the current to the armature winding 31.

  The auto cut 32 is configured to cut off the power supply via the contacts 32u, 32v, 32w when the temperature of the armature winding 31 rises above a predetermined temperature.

  The control device 20 is incorporated in a control panel housed in a control panel device 200 provided in the vicinity of the manhole pump device 10.

  The control device 20 includes a pumping control unit 26 that operates the electromagnetic switch 23 to drive the submersible pump 13 when the stored water level detected by the water level sensor 14 reaches the pump activation water level HWL, and an electromagnetic switch that drives the motor 30. 23 based on the operating state of the current sensor 24, the detection state of the current sensor 24 that detects the current of the power supply line connected to the armature winding 31 via the electromagnetic switch 23, and the stored water level detected by the water level sensor 14. An abnormality determination unit 25 for determining the presence or absence of the communication, and a communication unit 22 for notifying the outside when an abnormality is determined by the abnormality determination unit 25.

  This will be specifically described below.

  The control device 20 is used as a working area, a CPU, various control programs for starting and stopping the submersible pump 13 executed by the CPU, a ROM storing various control information used by the control program, and the like. RAM, an input / output circuit for inputting control information such as a water level measured by the water level sensor 14 and a pump failure signal, and outputting a control signal for starting the pump, and a predetermined time set by various control programs A timer that outputs a control signal indicating the lapse of the predetermined time after the lapse of time is provided.

  Various control programs are executed by the CPU, so that the pressure feed control unit 26, the abnormality determination unit 25, and the communication unit 22 are configured.

  The communication unit 22 includes a communication terminal corresponding to a public line network such as a data line network, a mobile phone network, and a general telephone line network, or a local communication medium such as a small area radio, and is connected to a management center via a base station. It is configured to communicate.

  The management center centrally manages abnormal information such as an accident such as a failure of a manhole pump device or an overflow and the like, and control information such as a stored water level and the amount of water sent and received from the communication unit 22, and the abnormal information is transmitted from the communication unit 22. When an abnormality is notified by this, the nearest management office is notified.

  The abnormality determination unit 25 determines that the current sensor 24 is abnormal when current is not detected by the current sensor 24 during operation of the electromagnetic switch 23 and a decrease in the stored water level is detected by the water level sensor 14, and When the current is not detected by the current sensor 24 during the operation of the electromagnetic switch 23 and a decrease in the stored water level is not detected by the water level sensor 14, it is determined that the motor overheat abnormality in which the auto cut 32 is operating is determined. ing.

  Note that the electromagnetic switch 23 is operating means a state in which power supply from the commercial power source AC is started, that is, a state in which the electromagnetic switch 23 is closed, as shown in FIG. The fact that the cut 32 is operating indicates that an abnormal overheating state of the armature winding 31 is detected and the auto cut 32 is in an open state.

  Each time the stored water level reaches the pump activation water level HWL, the pumping control unit 26 controls to alternately drive any of the plurality of submersible pumps 13 installed in the water tank, and the driven submersible pump 13 is abnormal. When it is determined by the determination unit 25 that the auto cut 32 is operating, the driven submersible pump 13 is switched to another submersible pump 13 and driven.

  Specifically, each time the stored water level reaches the pump activation water level HWL, the pumping control unit 26 performs control so as to alternately drive any of the plurality of submersible pumps 13 installed in the water storage tank. The submersible pump 13 is configured to drive the other submersible pumps 13 preferentially when it is determined by the abnormality determining unit 25 that the auto-cut 32 is operating and then the stored water level reaches the pump activation water level HWL. Yes.

  The control method of the submersible pump 13 according to the present configuration will be described in detail. As shown in FIG. 3, the pump control unit 26 controls the submersible pump 13 to start pumping control for pumping sewage to the sewage outflow pipe 11b. When the water level sensor 14 detects that the water level has risen to the pump activation water level HWL (SA1), the pump identification information for identifying the operation number of the submersible pump 13 set in the RAM is read (SA2).

  In step SA2, if the pump identification information is not set in the RAM, the pumping control unit 26 acquires the pump identification information of the submerged pump 13 to be initially driven that is set in the ROM in advance.

  The pumping control unit 26 operates the electromagnetic switch 23 to drive the submersible pump 13 indicated by the acquired pump identification information, and is incorporated into the submersible pump 13 from the commercial power supply AC (see FIG. 2) via the power supply line. The supply of electric power to the motor 30 is started (SA3), and abnormality determination is performed by the abnormality determination unit 25 (SA4).

  As shown in FIG. 4, the abnormality determination unit 25 starts an abnormality determination process and determines whether or not a current is detected by the current sensor 24 (SB1).

  If no current is detected by the current sensor 24 (SB1; N), the abnormality determination unit 25 uses the water level sensor 14 to check whether the current is not detected due to the abnormality of the current sensor 24. It is determined whether or not the stored water level is lowered (SB2).

  When the water level sensor 14 detects that the stored water level is decreasing (SB2; Y), the abnormality determination unit 25 detects the current even though the submersible pump 13 is driven and the stored water level is decreasing. Therefore, it is determined that an abnormality has occurred in the current sensor 24 (SB3).

  That is, the abnormality determination unit 25 can detect an abnormality of the current sensor 24 without providing a sensor different from the current sensor 24 and the water level sensor 14.

  On the other hand, when the abnormality determination unit 25 detects that no current is detected by the current sensor 24 (SB1; N) and the water level sensor 14 does not lower the stored water level (SB2; N), the abnormality switch 23 operates the electromagnetic switch 23. However, since the current is not detected and the stored water level is not lowered, the auto cut 32 of the submersible pump 13 to be driven is activated, and an abnormality in which no current flows to the electric motor 30, that is, the auto cut 32 is It is determined that an overheating abnormality of the operating motor has occurred (SB5).

  The abnormality determination unit 25 can determine with high accuracy whether or not the auto-cut 32 is operating by determining the outputs of the current sensor 24 and the water level sensor 14 twice.

  When the abnormality determination unit 25 determines an abnormality (SB3, SB5), the communication unit 22 notifies the abnormality by transmitting abnormality information corresponding to the abnormality to the external management center (SB4), and ends the abnormality determination. .

  When the current is detected by the current sensor 24 (SB1; Y), the abnormality determination unit 25 determines that the abnormality is not detected and is in a normal state, and ends the abnormality determination.

  Therefore, for example, the motor 30 is provided with an auxiliary contact that is closed or opened when the contact of the auto cut 32 is opened, and a signal line for transmitting an auxiliary contact signal indicating the closed or open state of the auxiliary contact to the outside is provided. Abnormalities of the submersible pump 13 and the current sensor 14 can be detected without taking out an auxiliary contact signal indicating the state of the auto cut 32, such as wiring.

  Returning to FIG. 3, the pressure feed control unit 26 determines whether or not the abnormality determination unit 25 determines that the auto-cut 32 is not operating (SA5).

  When it is determined by the abnormality determination unit 25 that the auto cut 32 is not operating (SA5; N), the pumping control unit 26 continues the operation of the electromagnetic switch 13, and the stored water level is lowered to the pump stop water level LWL. When the water level sensor 14 detects this (SA6), the timer is driven by setting a predetermined time previously set in the ROM (SA7), and when the control signal is output from the timer after the predetermined time has elapsed, the stop water level LLWL Then, the operation of the electromagnetic switch 23 is stopped, the power supply to the submersible pump 13 is stopped, and the drive of the submersible pump 13 is stopped (SA8).

  On the other hand, when it is determined by the abnormality determination unit 25 that the auto cut 32 is operating (SA5; Y), the pumping control unit 26 is the submersible pump 13 that is determined that the auto cut 32 is operating. The pump identification information of the other submersible pump 13 is set in the RAM (SA10), and the pressure feed control is resumed (SA1).

  When the pumping control unit 26 resumes the pumping control (SA1), and the water level sensor 14 detects that the stored water level has reached the pump activation water level HWL (SA1), it is different from the initial setting in the RAM. The pump identification information is read (SA2), and the electromagnetic switch 23 corresponding to the other submersible pump 13 corresponding to the pump identification information is operated (SA3).

  That is, the pumping control unit 26 is configured to preferentially switch the submersible pump 13 to be driven to the other submersible pump 13 every time the stored water level reaches the pump activation water level HWL.

  The above-described pressure feed control is repeatedly executed until there is a pressure feed control stop command by a control program by the CPU, such as when the power supply of the control device 20 is stopped (SA9).

  That is, from steps SA1 to SA10, when the stored water level detected by the water level sensor 14 reaches the pump activation water level HWL, a pressure feed control step for operating the electromagnetic switch 23 to drive the submersible pump 13 is configured. Steps SB1 to SB3 And SB5, the operating state of the electromagnetic switch 23 that drives the electric motor 30, the detection state of the current sensor 24 that detects the current of the feeder line connected to the armature winding 31 via the electromagnetic switch 23, and the water level An abnormality determination step for determining presence / absence of abnormality based on the stored water level detected by the sensor 14 is configured, and a communication step for notifying the outside when there is an abnormality in the abnormality determination step is configured by step SB4. .

  In addition, every time the stored water level reaches the pump activation water level HWL, the pumping control step alternately drives any of the plurality of submersible pumps 13 installed in the water storage tank, and the driven submersible pump 13 is an abnormality determination step. When it is determined that the auto-cut 32 is operating and the stored water level reaches the pump activation water level HWL, the other submersible pumps 13 are preferentially driven.

  Therefore, when the underwater pump 13 being driven is determined by the abnormality determination unit 25 to operate the auto cut 32, and when the stored water level reaches the pump activation water level HWL, the automatic feed control unit 26 operates the auto cut 32. Since the other submersible pump 13 different from the submerged pump 13 that has been operated is preferentially driven, the operation opportunity of the submerged pump 13 in an abnormal state in which the automatic cut 32 is frequently operated is reduced and stable. The stored water can be pumped to the outflow pipe.

  Further, in addition to the above-described configuration, the pumping control unit 26 controls to alternately drive any of the plurality of submersible pumps 13 installed in the water tank whenever the stored water level reaches the pump activation water level HWL. When the underwater pump 13 being driven is determined to be operating by the abnormality determination unit 25, the submergence time of the motor unit of the pump 13 is calculated based on the water level, and the submergence pump 13 is submerged. You may comprise so that the other submersible pump 13 may be driven preferentially until time passes predetermined time.

  Hereinafter, the control method of the submersible pump 13 according to the present configuration will be described in detail with reference to FIG. 5. In the figure, the steps with the same symbols as those shown in FIG. To do.

  The pumping control unit 26 performs a predetermined operation stop time set in advance in the ROM when the abnormality determination unit 25 determines that the auto-cut 32 is operating after executing steps SA1 to SA5 (SA5; Y). And the timer is driven (SC1), and the pump identification information of the submersible pump 13 having an abnormality determined that the auto cut 32 is operating is saved in a predetermined address area of the RAM (SC2). The operation stop time indicates a time for stopping the operation of the submersible pump 13.

  After that, the pumping control unit 26 restarts the pumping control to drive the submersible pump 13 other than the abnormal submersible pump 13 (SA1 to SA5), and corresponds to the pump identification information saved in the predetermined address area of the RAM. It is determined whether or not the stored water level has dropped to a water level PWL (hereinafter referred to as “pump submerged water level”; see FIG. 1) at which the main body of the submersible pump 13 having abnormality is submerged (SC3). In addition, each pump submerged water level PWL of the some submersible pump 13 installed in the water storage tank is preset to ROM.

  The pumping control unit 26 detects that the stored water level has not decreased to the pump submerged water level PWL by the water level sensor 14 and determines that the main body of the submersible pump 13 is submerged (SC3; Y). Then, it is determined whether or not a control signal indicating that a predetermined operation stop time has elapsed is output from the driving timer (SC4).

  When the pumping control unit 26 outputs a control signal from the timer and determines that a predetermined operation stop time has elapsed with the abnormal submersible pump 13 submerged (SC4; Y), the submersible pump 13 is driven. In order to obtain the target submersible pump 13, the pump identification information of the submersible pump 13 saved in the predetermined address area of the RAM is set in the RAM (SC5), and the pumping control is resumed (SA1).

  On the other hand, if the pumping control unit 26 determines that the predetermined operation stop time has not elapsed in a state where the abnormal submersible pump 13 is submerged (SC4; N), the driven submersible pump 13 is driven as it is. The pressure feed control is executed (SA6 to SA9, SA1).

  When the pumping control unit 26 detects that the stored water level has decreased to the pump submerged water level PWL by the water level sensor 14 and determines that the already abnormal submersible pump 13 is not submerged (SC3; N ), The submersible pump 13 being driven is driven as it is, and the pressure feed control is executed (SA6 to SA9, SA1).

  That is, since the submersible pump 13 in which the auto cut 32 is activated is in an overheated state for some reason, it needs to be naturally cooled by being stopped. If the electric motor part of the submersible pump 13 is submerged, it is efficiently cooled as much, and the normal state is quickly restored.

  Therefore, the pumping control unit 26 determines the degree of cooling based on the submergence time of the motor unit of the submersible pump 13, and the submersible pump 13 that has been overheated is effectively cooled until the submergence time has passed a predetermined time. Thus, the other submersible pump 13 is driven with priority.

  Further, in addition to the above-described configuration, the pumping control unit 26 controls to alternately drive any of the plurality of submersible pumps 13 installed in the water tank every time the stored water level reaches the pump activation water level HWL. When the underwater pump 13 being driven is determined to be operating by the abnormality determination unit 25, the operation stop time of the pump 13 that is defined based on the water level detected by the water level sensor 14 is then determined. Until the time elapses, the other submersible pump 13 may be preferentially driven.

  Hereinafter, although the control method of the submersible pump 13 by this structure is explained in full detail based on FIG. 6, in the figure, since the step of the same symbol as shown in FIG.3 and FIG.5 is the same processing content as the above-mentioned. Description is omitted.

  The pumping control unit 26 executes steps SA1 to SA5 and step SC3, and when the water level sensor 14 detects that the stored water level is lower than the pump submerged water level PWL, the stored water level is set in a predetermined ROM in advance. It is determined whether or not the operation determination water level SWL has been lowered (see FIG. 1) (SD1).

  The operation determination water level indicates a stored water level at the time of determining whether or not to operate the submersible pump 13 that has been determined to be abnormal as the submersible pump 13 to be driven, and is preset in the ROM.

  When the water level sensor 14 detects that the stored water level has not decreased to the operation determination water level SWL (SD1; Y), the pumping control unit 26 indicates that a predetermined operation stop time has elapsed from the driving timer. It is determined whether or not a signal is output (SC4).

  When the pumping control unit 26 detects that the control signal is output from the timer, the submersible pump 13 that has been determined to be abnormal before the stored water level falls to the predetermined operation determination water level SWL is abnormal. It is determined that the operation has been stopped for at least a predetermined operation stop time after the determination (SC4; Y).

  At this time, the pumping control unit 26 determines that the submersible pump 13 has been sufficiently cooled by natural heat dissipation, and the submersible pump that has been retreated to a predetermined address area of the RAM in order to target the submersible pump 13 to be driven. The pump identification information 13 is set in the RAM (SC5), and the pumping control is resumed (SA1).

  On the other hand, when the water level sensor 14 detects that the stored water level is lower than the operation determination water level SWL (SC3; N), the pumping control unit 26 drives the driving submersible pump 13 as it is to execute the pumping control. (SA6 to SA9, SA1).

  That is, the above-described pumping control step is configured by steps SA1 to SA10 and steps SC1 to SC5 and SD1, and each time the stored water level reaches the pump activation water level HWL, the plurality of submersible pumps 13 installed in the water storage tank. Any one of them is driven alternately, and when the underwater pump 13 being driven is determined by the abnormality determination unit 25 to be operating the auto-cut 32, it is then defined based on the water level detected by the water level sensor 14. You may comprise so that the other submersible pump 13 may be driven preferentially until the operation stop time of the said pump 13 passes.

  That is, as described above, the submersible pump 13 in which the auto-cut 32 is activated is in an overheated state for some reason, and therefore needs to be naturally cooled by being stopped. The time required for cooling the motor part of the submersible pump 13 varies depending on the water level. For example, if the motor part of the submersible pump 13 is submerged, it is cooled faster, and if it is not submerged, it is cooled. The time will be longer.

  Therefore, the pumping control unit 26 determines that the cooling is insufficient until the operation stop time of the submersible pump 13 defined based on the water level detected by the water level sensor 14 elapses, and the other submersible pumps. By driving the pump 13 preferentially, cooling of the submersible pump 13 in which the auto cut 32 is activated is promoted.

  Note that a plurality of operation stop times corresponding to the operation determination water level SWL described above may be set in the ROM in advance. However, in accordance with this, step SD1 executes step SC4 each time the stored water level decreases until it reaches each operation determination water level SWL, and whether or not the operation stop time corresponding to each operation determination water level SWL has elapsed. It is configured to determine.

  Further, in accordance with the change in the configuration of the step SD1, the step SC1 is configured to set a plurality of operation stop times set in the ROM to the timer, and the timer is set whenever the plurality of operation stop times elapses. A control signal indicating the passage of time is output.

  According to this configuration, whenever the pumping control unit 26 detects that the stored water level is lowered to a plurality of operation determination water levels by the water level sensor 14, the submersible pump 13 that has been determined to be abnormal is sufficiently cooled. Therefore, it is possible to appropriately determine the time when the submersible pump 13 can be driven, and to reduce the time for preferentially driving the other submersible pumps 13.

  In the above-described embodiment, as shown in FIG. 1, the submersible pump 13 is installed in the manhole 12 that stores the sewage flowing from the sewage inflow pipe 11 a into the water tank, and the sewage stored in the manhole 12. It is shown that the control device and control method of the submersible pump 13 according to the present invention are extremely suitable for controlling the manhole pump.

  However, the submersible pump 13 is not limited to a manhole pump, and may be a submersible pump provided in other water treatment plants such as a plurality of drainage stations and pump gates installed in rivers. The present invention can be applied to a control method.

  Further, the control device 20 is used in a display device such as a meter that displays various control information such as a stored water level and an amount of current supplied to the submersible pump 13, a pressure control unit 26, an abnormality determination unit 25, and a communication unit 22. Input operation keys such as numeric keys and buttons for setting operation of various setting information to be performed and manual operation of the submersible pump 13 may be provided.

  In this case, in the above-described embodiment, various control information such as the pump submerged water level PWL and the operation determination water level SWL set in advance in the ROM is configured to refer to a predetermined address in the RAM, and in accordance with this, the above-described control information is configured. Various control information such as the pump submerged water level PWL and the operation determination water level SWL input via an input operation key provided in the control device 20 may be set to the predetermined address to be referred to in the RAM. .

  In this case, since various control information can be set and operated via input operation keys provided in the control device, various control information can be set in the control program constituting the pressure feed control unit 26 and the abnormality determination unit 25. It becomes possible to incorporate it into a general control device of another submersible pump provided with an input operation key.

  In addition, the control device 20 may be configured not to include the communication unit 22, or may be configured to display a display indicating an abnormality in the control panel.

  The specific configuration of the control device and control method for the submersible pump described above is not limited to the above-described embodiment, and it is needless to say that the design can be appropriately changed within the scope of the effects of the present invention. .

10: Manhole pump device 13: Submersible pump 14: Water level sensor 20: Control device 22: Communication unit 23: Electromagnetic switch 24: Current sensor 25: Abnormality determination unit 26: Pumping control unit 30: Electric motor 31: Armature winding 32 : Auto cut AC: Commercial power supply HWL: Pump start water level LWL: Pump stop water level PWL: Pump submerged water level SWL: Operation determination water level

Claims (9)

An electric motor in which an autocut is interposed in series in an armature winding is a control device for a submersible pump that pumps stored water flowing into a water tank to an outflow pipe,
When the stored water level detected by the water level sensor reaches the pump start water level, the electromagnetic switch is operated to drive the submersible pump, the operating state of the electromagnetic switch that drives the electric motor, and the electromagnetic switch The abnormality determination unit includes an abnormality determination unit that determines whether there is an abnormality based on a detection state of a current sensor that detects a current of a power supply line connected to the armature winding, and a stored water level detected by a water level sensor. A control device for a submersible pump that determines that the motor is overheated when the automatic cut is activated when no current is detected by the current sensor during operation of the electromagnetic switch and no decrease in the stored water level is detected by the water level sensor.   2. The submersible pump according to claim 1, wherein the abnormality determination unit determines that the current sensor is abnormal when no current is detected by the current sensor during operation of the electromagnetic switch and a decrease in the stored water level is detected by the water level sensor. Control device.   Each time the stored water level reaches the pump activation water level, the pumping control unit controls to alternately drive any of a plurality of submersible pumps installed in the water tank. The control device for a submersible pump according to claim 1 or 2, wherein the control device switches to another submersible pump when it is determined that the motor is overheated abnormally.   Each time the stored water level reaches the pump activation water level, the pumping control unit controls to alternately drive any of a plurality of submersible pumps installed in the water tank. 4. The submersible pump control device according to claim 3, wherein when the electric motor is overheated abnormally while the cut is operating and the stored water level reaches the pump starting water level, the other submersible pump is driven preferentially.   Each time the stored water level reaches the pump activation water level, the pumping control unit controls to alternately drive any of a plurality of submersible pumps installed in the water tank. If it is determined that the motor is overheating abnormally, the other submersible pumps are preferentially driven until the pump shutdown time specified based on the water level detected by the water level sensor has passed. The submersible pump control device according to claim 3.   The control device for a submersible pump according to any one of claims 1 to 5, further comprising a communication unit that reports an abnormality to the outside when the abnormality determination unit determines that an abnormality has occurred.   The underwater pump according to any one of claims 1 to 6, wherein the submersible pump is installed in a manhole that stores sewage flowing in from a sewage inflow pipe, and controls a submersible pump that pumps the sewage stored in the manhole to a sewage outflow pipe. Manhole pump device with pump control device. An electric motor in which an autocut is interposed in series in an armature winding is incorporated, and is a control method for a submersible pump that pumps stored water flowing into a water storage tank to an outflow pipe,
When the stored water level detected by the water level sensor reaches the pump start water level, the electromagnetic switch is operated to drive the submersible pump, the operation state of the electromagnetic switch that drives the motor, and the electromagnetic switch Based on the detection state of the current sensor that detects the current of the power supply line connected to the armature winding and the stored water level detected by the water level sensor, the current sensor is not detected during the operation of the electromagnetic switch, When the water level sensor does not detect a decrease in the stored water level, it has an abnormality determination step that determines that the motor is overheated and the auto cut is operating.In the pumping control step, each time the stored water level reaches the pump activation water level, One of the multiple submersible pumps installed in the motor is driven alternately, and the submersible pump being driven is automatically cut at the abnormality determination step. If it is determined that the method of controlling a water pump to perform the switching step of switching to another water pump.   The submersible pump control method according to claim 8, wherein a communication step of notifying the outside when an abnormality is determined in the abnormality determination step is executed.

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