JP2016194287A - Drainage pump machine field, pump administrative method, and pump administrative system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simplified pump administrative method capable of executing an inclination management without selecting the time maintenance in a check work plan while it is possible to grasp the damage and deterioration of parts by securing the same repeatability conditions for a centrifugal impeller, submerged bearings, etc., without pulling up the pump.SOLUTION: A drainage pump machine field 100 comprises: a suction sump 1; a body of revolution 31; a vertical shaft pump p for draining water in the suction sump 1; and a driving machine 24 for driving the body of revolution 31 of the vertical shaft pump p. A control device 30 executes a pump stop step stopping the vertical shaft pump p upon detecting a prescribed stop condition for stopping the vertical shaft pump p. A pump administrative device 70 measures the stop time until the rotation of the body of revolution 31 is stopped in the pump stop step so as to predict inspection/repair time based on the stop time.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a drainage pump station for draining water using a vertical shaft pump, a pump management method and a pump management system for managing a vertical shaft pump.

  The vertical pump is operated in a state where the impeller and the underwater bearing are immersed in water. They gradually wear and corrode over time. For this reason, it is necessary to periodically perform inspection work and in particular check the wear status of the underwater bearing portion. Inspection of the underwater bearing is one of the important items because wear and damage caused by the underwater bearing are directly related to abnormal vibration of the pump.

  From the viewpoint of reliability in flood control and drainage facilities that use vertical shaft pumps, preventive maintenance is not necessary for equipment that is used, but after the occurrence of abnormal phenomena such as breakdowns, it is not a post-maintenance that must be dealt with. Done.

  By the way, in a vertical shaft pump, since main parts, such as an impeller, are in an underwater part, a state check is difficult. Therefore, conventionally, inspection work by time maintenance in which inspection is performed every predetermined period has been performed.

  However, since the pump in the flood control drainage facility is for emergency use, the pump is not always operated, and the operation time throughout the year is relatively short. Moreover, since there is a difference in the amount of rain and the amount of rain depending on the region, the operation time varies from region to region. For this reason, there is a difference in the degree of deterioration of the equipment in each region, and it is not necessarily economically effective to perform the inspection every period uniquely determined by time maintenance.

  In addition, many of the vertical shaft pumps are inspected and maintained by pulling up the pump. However, raising the pump requires a lot of cost and a long construction period. Therefore, from the economical point of view, it is not possible to pull up for each inspection part / consumable, so even if parts that are concerned about wear or deterioration are still in a healthy state, they should be combined with a single inspection. May be replaced. In particular, there are many cases where there is almost no deterioration in facilities that are not operated so much, and further examination of an economical maintenance method is required.

  Several proposals have been made for more appropriate maintenance methods. For example, Patent Literature 1 and Patent Literature 2 propose a method of inspecting the inside without using a small camera and pulling up the pump. However, although it is possible to confirm trauma from the camera image, it is not possible to grasp the details of damage or internal defects. In particular, in river drainage, the water quality environment may be poor, and when mud or the like is attached, it is difficult to identify the state.

  Patent Document 3 proposes a method that can perform inspection without pulling up the pump and can reduce the cost. However, the method of Patent Document 3 is intended only for tail bearings and cannot be applied to evaluation of intermediate bearings and the like.

  In order to cope with the limitations of the above proposal, a method of previously installing instrumentation in the pump and monitoring the state during operation has been proposed and adopted. However, since the operation state of the pump varies greatly depending on the difference between the internal and external water levels, the deterioration state cannot be predicted simply from the tendency of the operation time. For this reason, in Patent Document 4, the device is devised so that the discharge amount can be monitored and the trend can be managed from the recording under the same conditions.

JP 2006-161790 A JP2009-41503 JP2007-285253A JP2010-242730

  However, since the water level fluctuations to some extent also occur in the pump device of the cited document 4, it is difficult to reproduce the same conditions reliably, and vibrations from the driving machine become noise, which causes deterioration or loss of minute parts. There is a problem that it is difficult to understand the situation due to the influence of. Moreover, in the pump apparatus of the cited reference 4, the vibration meter is attached to the suspension pipe in the suction water tank to measure the vibration caused by the wear of the bearing of the rotating shaft. If installed inside, there is a concern that the vibrometer itself may deteriorate over time. On the other hand, when the vibration meter is attached above the suction water tank, there is a problem that the vibration of the rotating shaft cannot be measured accurately.

  This application was made to solve the above-mentioned problems, and by grasping the same reproducible conditions for impellers and underwater bearings without pulling up the pump, it was possible to grasp the damage and deterioration of the parts. An object of the present invention is to provide a simple drainage pump station, a pump management method, and a pump management system that can perform trend management without selecting time maintenance in an inspection work plan.

  Another object of the present invention is to provide a drainage pump station, a pump management method, and a pump management system that can detect deterioration of the submersible bearing without installing a sensor in the suction water tank.

  In order to solve the above-mentioned problems, the inventors have made extensive studies and have come up with the following invention. That is, a first aspect of the present invention includes a suction water tank, a rotary shaft as a rotating body, and an impeller fixed to the rotary shaft, a vertical pump that discharges water in the suction water tank, and the vertical pump A driving machine for driving the rotating body; a detecting means for detecting a predetermined stopping condition for stopping the vertical shaft pump; a connection state for transmitting a driving force from the driving machine to the rotating body; and the driving machine. Transmission means for switching between a cutting state in which the driving force from the rotating body is not transmitted to the rotating body, and a pump stop means for performing a pump stop process for stopping the vertical pump when the stop condition is detected by the detection means, In a drainage pump station that drains through a discharge valve connected to a discharge pipe of the vertical shaft pump, the pump stop means includes the detection means Therefore, when the stop condition is detected, as the pump stop step, the transmission unit is switched to the disconnected state to stop the vertical pump, and the prediction unit is configured to stop the rotating body in the pump stop step. The drainage pump station is characterized in that the inspection / repair time is predicted based on a stop time until the rotation stops.

  With this configuration, the inspection / repair time is predicted based on the stop time of the vertical pump in a highly reproducible state where the stop condition of the vertical pump is detected, so the inspection / repair time can be predicted by accurate trend management. . In addition, because the underwater bearing deteriorates and vibration occurs on the rotating shaft, the stop time is shortened, so by predicting the inspection and repair time based on the stop time, a sensor is installed in the suction water tank to directly vibrate. Even without detection, it is possible to accurately manage the tendency based on the deterioration of the underwater bearing. In addition, this invention does not prevent providing sensors, such as a vibrometer, in a suction water tank.

  The stop time is the time from when the pump stop process is started until the rotation of the rotating body stops, or until the rotation of the rotating body stops after the transmission means is switched to the disconnected state. It may be time.

  A second aspect of the present invention includes a suction water tank, a rotating shaft as a rotating body and an impeller fixed to the rotating shaft, a vertical pump that discharges water in the suction water tank, and the rotation of the vertical pump A driving machine for driving the body, a detecting means for detecting a predetermined stopping condition for stopping the vertical shaft pump, a connection state for transmitting the driving force from the driving machine to the rotating body, and A transmission means for switching between a cutting state in which the driving force is not transmitted to the rotating body, a pump stop means for performing a pump stop process for stopping the vertical pump when the detection condition is detected by the detection means, A drainage pump station that drains through a discharge valve connected to a discharge pipe of the vertical shaft pump. When the stop condition is detected, the transmission means is switched to the disconnected state to stop the vertical pump, and the vertical pump has a sensor for measuring the state of the vertical pump at least in the pump stop process. And the predicting means predicts the inspection / repair time based on the state of the vertical pump measured by the sensor until the rotation of the rotating body stops in the pump stop step. This is a drainage pump station.

  With this configuration, the inspection / repair time is predicted based on the state of the vertical pump until the rotation of the rotary body of the vertical pump stops in a highly reproducible state where the stop condition of the vertical pump is detected. It is possible to predict the time for proper inspection and repair.

  The state of the vertical pump in the pump stop process may be the rotational speed of the rotating body, the temperature of the bearing, the vibration of the bearing, and / or the amplitude of the vibration in the pump stop process.

  The detection means may detect that the stop condition is a stop water level of the suction water tank and that the discharge valve is fully closed.

  According to a third aspect of the present invention, there is provided a pump management method for predicting an inspection / repair time of a vertical shaft pump including a rotary shaft and a rotating body that is rotationally driven and includes an impeller fixed to the rotary shaft. When the predetermined stop condition for stopping the pump is stopped, a pump stop process for stopping the vertical shaft pump is performed, and in the pump stop process, the rotation of the rotating body is performed in a state where no rotational driving force is supplied to the rotating body. The pump management method is characterized in that a stop time until the engine stops is measured, and an inspection / repair time is predicted based on the measured stop time.

  With this configuration, the inspection / repair time is predicted based on the stop time of the vertical pump in a highly reproducible state where the stop condition of the vertical pump is detected, so the inspection / repair time can be predicted by accurate trend management. . In addition, because the underwater bearing deteriorates and vibration occurs on the rotating shaft, the stop time is shortened, so by predicting the inspection and repair time based on the stop time, a sensor is installed in the suction water tank to directly vibrate. Even without detection, it is possible to accurately manage the tendency based on the deterioration of the underwater bearing.

  According to a fourth aspect of the present invention, there is provided a pump management method for predicting an inspection / repair time of a vertical shaft pump including a rotary shaft and a rotary body that is rotationally driven and includes an impeller fixed to the rotary shaft. When a predetermined stop condition for stopping the pump is satisfied, a pump stop process for stopping the vertical shaft pump is performed, and in the pump stop process, a rotational driving force is not supplied to the rotating body. A pump management method characterized by measuring a pump state and predicting an inspection / repair time based on the measured state.

  Even with this configuration, when the vertical pump stop condition is satisfied, inspection is performed based on the state of the vertical pump in a highly reproducible state in which the rotary pump is rotated freely without supplying rotational driving force to the rotary body of the vertical pump. -Since the repair time is predicted, it is possible to accurately predict the inspection and repair time.

  A fifth aspect of the present invention includes a suction water tank, a rotary body, a vertical pump that discharges water in the suction water tank, a drive unit that drives the rotary body of the vertical pump, and the vertical pump is stopped. A drainage pump machine comprising: a detecting means for detecting a predetermined stop condition for performing; and a pump stop means for performing a pump stop process for stopping the vertical shaft pump when the stop condition is detected by the detecting means. In the pump stop process, the pump management system is used for measuring the stop time until the rotation of the rotating body stops, and on the basis of the stop time measured by the measurement means A pump management system comprising a prediction means for predicting a repair time.

  With this configuration, since the inspection / repair time is predicted based on the state of the vertical pump in a highly reproducible state that the stop condition of the vertical pump is detected, the inspection / repair time can be predicted by accurate trend management. In addition, because the underwater bearing deteriorates and vibration occurs on the rotating shaft, the stop time is shortened, so by predicting the inspection and repair time based on the stop time, a sensor is installed in the suction water tank to directly vibrate. Even without detection, it is possible to accurately manage the tendency based on the deterioration of the underwater bearing.

  The sixth aspect of the present invention includes a suction water tank, a rotating body, a vertical pump that discharges water in the suction water tank, a drive unit that drives the rotary body of the vertical pump, and the vertical pump is stopped. A drainage pump machine comprising: a detecting means for detecting a predetermined stop condition for performing; and a pump stop means for performing a pump stop process for stopping the vertical shaft pump when the stop condition is detected by the detecting means. A pump management system used in the above-described measurement, in the pump stop process, measuring means for measuring the state of the vertical shaft pump, and predicting means for predicting the inspection / repair time based on the state measured by the measuring means; A pump management system comprising:

  Even with this configuration, when the vertical pump stop condition is satisfied, inspection is performed based on the state of the vertical pump in a highly reproducible state in which the rotary pump is rotated freely without supplying rotational driving force to the rotary body of the vertical pump. -Since the repair time is predicted, it is possible to accurately predict the inspection and repair time.

  According to the present invention, since the pump state is measured in the pump stop process performed when the predetermined stop condition is satisfied, the same condition is reproduced as the condition for measuring the pump state, and the measured pump It is possible to appropriately grasp the damage and deterioration of the part from the state, and it is possible to perform trend management without selecting time maintenance in the inspection work plan.

The figure which shows the structure of the drainage pump station (drainage equipment) in embodiment of this invention Operation flow diagram until the clutch is disengaged in the pump stop process according to the embodiment of the present invention The block diagram which shows the structure of the pump management system for predicting the inspection and repair time of the vertical shaft pump which concerns on embodiment of this invention The graph which shows attenuation | damping of the rotational speed of the rotary body which concerns on embodiment of this invention The graph which shows the change of the measured value with respect to the total operation time of the pump which concerns on embodiment of this invention The graph which shows the evaluation and relationship of the inclination of the change with respect to the total operation time of the measured value which concerns on embodiment of this invention, and emergency

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below shows an example when the present invention is implemented, and the present invention is not limited to the specific configuration described below. In carrying out the present invention, a specific configuration according to the embodiment may be adopted as appropriate.

  FIG. 1 is a diagram showing a configuration of a drainage pump station (drainage facility) according to an embodiment of the present invention. As shown in FIG. 1, the drainage pump station 100 includes a vertical shaft pump P. The vertical shaft pump P is suspended from the pump installation floor 2 at the upper part of the suction water tank 1 via the pump base 13, and is connected to the suspension pipe 10 disposed in the suction water tank 1 and the upper part of the suspension pipe 10. A bent discharge pipe 11 and a discharge pipe 12 connected to the bent discharge pipe 11 are provided. A pump casing 14 is connected to the lower end of the suspension pipe 10, and a suction bell mouth 15 is connected to the lower end of the pump casing 14. The discharge pipe 12 is provided with a discharge valve 26, and a backflow prevention valve 27 is provided at the discharge port of the discharge pipe 12. A plurality of guide vanes 19 are arranged above the impeller 17 (discharge side).

  A pump rotating shaft 16 is provided at the center of the suspension pipe 10 and the pump casing 14 through the bent discharge pipe 11. The pump rotating shaft 16 is rotatably supported in the pump casing 14 via underwater bearings (water lubricated bearings) 18-1 and 18-2. An impeller 17 is attached to the lower end of the pump rotating shaft 16. The pump rotating shaft 16 and the impeller 17 rotate integrally as a rotating body 31.

  The upper part of the pump rotating shaft 16 penetrates the bent discharge pipe 11 and is supported by the outer bearing 20, and the upper end is connected to the output shaft 21 b of the speed reducer 21. The outer bearing 20 may be a single bearing capable of receiving both a radial load and a thrust load, and is a combination of a radial bearing capable of receiving a radial load and a thrust bearing capable of receiving a thrust load. May be. Further, the outer bearing 20 may be a bearing that receives only a radial load, and the thrust load may be received by the speed reducer 21.

  In the vicinity of the outer bearing 20, a rotation detector 21 a that detects the rotation of the pump rotation shaft 16 is provided. The rotation detection unit 21a detects that the pump rotation shaft 16 is rotating, but can detect not only the presence / absence of rotation but also the rotation speed of the pump rotation shaft 16.

  The speed reducer 21 includes a clutch 23. An input shaft (not shown) of the speed reducer 21 is connected via a clutch 23 to an output shaft 24a of a drive unit 24 including an electric motor, a diesel engine, a gas turbine, and the like.

  The input shaft 23 a of the clutch 23 is connected to the output shaft 24 a of the driving machine 24. Further, the output shaft 21 b of the speed reducer 21 is connected to the pump rotating shaft 16. The clutch 23 has a connection state in which the driving force from the driving machine 24 is transmitted to the rotating body 31 including the pump rotating shaft 16 and the impeller 17 and a disconnected state in which the driving force from the driving machine 24 is not transmitted to the rotating body 31. Switch. That is, the clutch 23 is connected to transmit the torque of the rotating shaft 24 a of the driving machine 24 to the pump rotating shaft 16 and is disconnected, so that the clutch 23 is connected between the rotating shaft 24 a of the driving machine 24 and the pump rotating shaft 16. The transmission of torque is cut off. The clutch 23 corresponds to the transmission means of the present invention.

  By disengaging the clutch 23, the driving force of the driving machine 24 is not transmitted to the pump rotating shaft 16, and the torque due to the inertial force of the pump pump rotating shaft 16 is not transmitted to the rotating shaft 24a of the driving machine 24. Therefore, the rotating body 31 composed of the pump rotating shaft 16 and the impeller 17 performs free rotational motion only by its inertial force and frictional force. In addition, when the drive machine 24 is an electric motor, the clutch 23 may be a circuit breaker.

  The drainage pump station 100 includes a control device 30 that controls the entire drainage pump station 100. Based on a water level signal S1 from a water level sensor 32 provided in the suction water tank 1 and a switch signal S2 from a switch (not shown) operated by an operator, a control signal S3 for closing the discharge valve 26, and a clutch 23 A control signal S4 for switching between the connected state and the disconnected state is output.

  In the pump equipment configured as described above, the driving machine 24 is started and the clutch 23 is connected by the control signal S4, whereby the rotational force of the output shaft 24a of the driving machine 24 is rotated through the clutch 23 and the speed reducer 21. When transmitted to the shaft 16, the impeller 17 rotates and water is sucked from the lower end opening of the suction bell mouth 15. The sucked water is discharged to the discharge water tank 3 through the pump casing 14, the suspension pipe 10, the bent discharge pipe 11, and the discharge pipe 12.

  When the control device 30 receives a water level signal indicating that the water absorption level in the suction water tank 1 has risen from the water level sensor 32 and has reached the pump operation start water level above the impeller 17, the control signal S4 for connecting the clutch 23 is received. Is output to the clutch 23 to start the operation of the vertical shaft pump P (rotation of the rotating body 31).

  When the control device 30 receives the water level signal S1 indicating that the water level in the suction water tank 1 has fallen and has reached the stop water level, the control device 30 outputs a control signal S3 for fully closing the discharge valve 26 to the discharge valve 26, The discharge valve 26 is closed. When the discharge valve 26 is closed, the control device 30 outputs a control signal S4 for disconnecting the clutch 23 to the clutch 23 to stop the operation of the vertical pump P (rotation of the rotating body 31) (pump stop process). Thus, the control apparatus 30 starts a pump stop process on the stop conditions that the water level in the suction water tank 1 reached the stop water level, and the discharge valve 26 was fully closed. In this pump stop process, the rotator 31 freely rotates as described above. The control device 30 that detects the stop condition corresponds to the detection means of the present invention, and the control device 30 that performs the pump stop process corresponds to the pump stop means.

  FIG. 2 is an operation flowchart until the clutch 23 is disengaged in the pump stop process. Upon receiving the water level signal S1 indicating that the water level in the suction water tank 1 has reached the stop water level, the control device 30 performs a stop water level confirmation display (step ST21). And the operator who confirmed this stop water level confirmation display turns OFF a switch (step ST22). When the water level signal S1 indicating that the water level in the suction water tank 1 has reached the stop water level is both received and the stop switch is turned off (step ST23), the control device 30 performs a closing operation on the discharge valve 26. Is output (step ST24), and a stop display is performed (step ST25).

  The control device 30 does not wait for the operator to turn off the stop switch, and automatically performs a closing operation in response to receiving the water level signal S1 indicating that the water level in the suction tank 1 has reached the stop water level. The control signal S3 to be instructed may be output (step ST24) and stopped (step ST25). Regardless of the water level signal S1, when the operator turns off the switch, the control device 30 outputs the control signal S3 instructing the closing operation (step ST24), and the stop display (step ST25). The subsequent processing is executed. In this case, in step ST23, the control device 30 confirms that either the reception of the water level signal S1 indicating the state in which the water level in the suction water tank 1 has reached the stop water level or the OFF of the stop switch (OR) has been performed. Detect.

  When the discharge valve 26 is fully closed in response to the control signal S3 (step ST26), the control device 30 instructs the stop of the drive unit 24 (step ST27), and displays that the discharge valve 26 is closed (step ST27). ST28). After that, the control device 30 switches the clutch 23 to the disengaged state (step ST29), and performs a display indicating that the driving machine 24 has been instructed to stop (step ST30). Each display described above is performed by lighting a corresponding lamp provided in the control device 30.

  FIG. 3 is a block diagram showing the configuration of the pump management system 200 for predicting the inspection / repair time of the vertical shaft pump P. In the pump management system 200, a temperature sensor 71-1 and a vibration sensor 72-1, which are detachably attached to the underwater bearing 18-1, and a temperature sensor 71 detachably attached to the intermediate bearing 18-2 are attached to the pump management device 70. -2 and the vibration sensor 72-2, the rotation detection unit 21a that detects the rotation of the pump rotation shaft 16, and the control device 30 are connected to be able to transmit various signals. A monitor 73 is connected to the pump management device 70.

  The temperature sensor 71-1 and the vibration sensor 72-1 measure the temperature and vibration of the submersible bearing 18-1 as the state of the vertical pump P, and the temperature sensor 71-2 and the vibration sensor 72-2 are the same as those of the vertical pump P. As a state, the temperature and vibration of the underwater bearing 18-2 are measured. These measured values are input to the pump management device 70. The detection values (the presence / absence of rotation and the rotation speed) of the rotation detection unit 21 a are input to the pump management device 70. Note that all of the temperature sensors 71-1 and 71-2 and the vibration sensors 72-1 and 72-2 may not be provided. Moreover, these sensors may be installed permanently in the vertical shaft pump P. Although not shown in FIG. 3, the outer bearing 20 may be provided with a temperature sensor or a vibration sensor that outputs a measurement value to the pump management device 70.

  As described above, when the stop condition is satisfied, the control device 30 outputs the control signal S4 for disengaging the clutch 23 to the clutch 23. At this time, the control device 30 also outputs this control signal to the pump management device 70 ( In FIG. 1, it is shown as a control signal S5). The pump management device 70 receives this control signal S5, grasps that the pump stop process has started, starts counting the stop time until the pump rotating shaft 16 stops, and temperature sensors 71-1, 71- 2 and the measured values of the vibration sensors 72-1 and 72-2 are input. The pump management device 70 grasps that the rotation of the pump rotating shaft 16 has stopped based on the detection value of the rotation detecting unit 21a, stops timing, and until the rotation of the pump rotating shaft 16 stops in the pump stopping process. Measure (calculate) the stop time. At this time, the pump management device 70 functions as a measurement unit that measures the stop time.

  The pump management device 70 predicts the inspection / repair timing of the vertical pump P based on the stop time until the rotation of the rotating body 31 stops in the pump stop process and the state of the vertical pump P. First, the prediction of the inspection / repair time based on the downtime will be described.

  The stop time in the pump stop process is long in the initial state in which there is no abnormality in the pump rotating shaft 16, the impeller 17, the underwater bearings 18-1, 18-2, the outer bearing 20 and the like of the vertical pump P, and is long due to inertial force. Rotation continues. When abnormalities such as deterioration of the underwater bearings 18-1 and 18-2 and defects such as eccentricity, bending, and imbalance of the rotating body 31 occur, the sliding friction increases with the progress, and the rotation is prevented. Because the force works, the stop time is gradually shortened. Therefore, by monitoring the stop time, the state of the vertical pump P including the states of the underwater bearings 18-1, 18-2, the outer bearing 20, and the like can be monitored.

  Therefore, the pump management device 70 inputs the detection value from the rotation detection unit 21a, and stores the temporal change in the rotation speed as trend data. FIG. 4 is a graph showing the attenuation of the rotation speed of the rotating body 31. In FIG. 4, the solid line is the locus of the rotational speed until the stop in a healthy state (initial), and the dotted line is the locus of the rotational speed until the stop when an abnormal state occurs due to aged deterioration or the like. When in the operating state and the stop condition is not satisfied, the rotating body 31 rotates at the rated rotational speed. When the stop condition is satisfied and the pump stop process is started, the supply of driving force from the driving machine 24 to the rotating body 31 is cut off, so that the rotating body 31 starts a free rotating motion and the rotational speed gradually increases. Decrease. At this time, as shown in FIG. 4, when an abnormality due to aging or the like has occurred, the rotational speed decreases more rapidly than in a healthy state, and the rotational speed becomes zero earlier.

  The pump management device 70 stores the sound value T of the stop time, and determines the inspection / repair time by managing and evaluating the difference between the sound value T and the measured value T ′ of the current stop time. Specifically, when the difference between the sound value T and the measured value T ′ exceeds a predetermined threshold, the pump management device 70 determines that the inspection / repair time is current, that is, inspection / repair is necessary. . The pump management device 70 may set the measured value T ′ measured at each time the vertical shaft pump P is repaired as a sound value T, or measured immediately after the vertical shaft pump P is newly installed. The measured value T ′ may be the sound value T. Thus, since the necessity for inspection and repair is judged based on the stop time, the inspection and repair work can be performed economically without being restricted by time maintenance.

  The pump management device 70 records the measurement values from the temperature sensors 71-1 and 71-2 and the vibration sensors 72-1 and 72-2 simultaneously with the measurement and recording of the stop time, and uses these measurement values. Analyze the state of the vertical shaft pump P to predict the inspection / repair time. For example, when the bearing temperature is difficult to drop, the pump management device 70 determines that there is a bearing abnormality, deterioration of the lubricating oil, or the like. In addition, when the vibration value tends to increase, the pump management device 70 determines that there is clogging of dust or contact between the impeller 10 and the casing.

  Furthermore, by performing frequency analysis for vibrations in the pump management device 70, it is possible to make use of it for factor analysis in the event of an abnormality, thereby enabling early countermeasures. As for shaft vibration, it is also effective for factor analysis at the time of abnormality, as described above, to check and record the shape of the shaft shake (Lissajous) using a non-contact sensor. Furthermore, the state of the vertical pump P indicated by the recorded measurement value can also be used for trend management in the same manner as the stop time described above.

  As described above, the pump management device 70 measures the stop time of the vertical pump P, the temperature of the bearing, and the vibration in the pump stop process started when a predetermined stop condition is satisfied. Since the stop condition of the vertical pump P is the most reproducible situation in the series of operation states of the vertical pump P, it can be treated as the same condition in evaluating the state of the vertical pump P. In the above-described embodiment, the stop condition is that the water level detected by the water level sensor 32 becomes a predetermined value. In a situation where this condition is satisfied, the load resistance applied to the impeller during free movement is always the same condition. Therefore, the reproducibility of the operation state of the vertical shaft pump P is high.

  In particular, in the above-described embodiment, in the pump stop process, the clutch 23 separates the drive unit 24 and the rotating body 31 so that the casing 14 is filled with water of the same condition regardless of the drive unit 24. Since the rotating body 31 rotates, it is possible to observe and evaluate the rotating state of the rotating body 31 alone. Therefore, under the stop condition that is always the same condition, the rotating body 31 separated from the drive machine 24 becomes a free motion due to inertial force, and the rotation of the rotating body 31 is attenuated only by the influence of its own sliding and eventually stops. In other words, the degree of the influence of sliding can be observed by the stop time from when the drive unit and the rotating body 31 are separated to when they are stopped.

  Measuring in a state where the drive unit 24 and the rotating body 31 are separated can eliminate fluid vibrations associated with the drive unit 24 and drainage, so that such vibrations would be a large noise in the past. Therefore, it is possible to confirm and detect a state quantity of a minute part which has been difficult to observe, and to perform accurate trend management.

  Also, even if there is a difference in rainy period and rainfall depending on the region, even if there is a large difference in operation time for each region, the stop condition can be regarded as the same constant condition in any region, and it is easy to implement anywhere, The state monitoring based on the elapsed time until the rotation of the rotating body stops can be appropriately maintained and managed based on accurate evaluation without being affected by such variations in the operation time and the number of operations in each region.

  In the above example, the threshold value of the measurement value T ′ for determining that inspection or repair is necessary is determined based on the difference from the sound value T. However, the threshold value of the measurement value T ′ is set to the sound value T. It is good also as an absolute value which does not depend, and good also as a predetermined ratio (for example, 50% of the healthy value T) of the healthy value T. As an index for management and evaluation, the pump management device 70 replaces or in addition to the determination criterion that the measured value T ′ is below the threshold value, the degree of variation of the measured value T ′ with respect to the past measured value T ′, that is, The deviation, the deviation rate, etc. may be adopted as judgment criteria, and a comprehensive judgment may be made by combining these judgment criteria.

  When the measured value T ′ does not reach the threshold value, the pump management device 70 predicts the time when inspection / repair is necessary based on the measured value T ′. For this purpose, the pump management apparatus 70 records, as a log, the measured value T ′ after the vertical pump P is newly installed or the measured value T ′ after the repair is performed. Since the control logic differs between normal stop and emergency stop, it is preferable to record this log separately for "normal time" and "emergency time".

  FIG. 5 is a graph showing a change in the time (stop time) until the rotating body 31 stops with respect to the total operation time of the vertical shaft pump P, that is, the measurement value T ′. The pump management device 70 calculates an approximate expression from the tendency of the measured value T ′ with respect to the total operation time of the vertical pump P, and derives the total operation time at which the stop time reaches the threshold from the approximate expression, so that the inspection / repair timing is obtained. Predict. The operation time from the current total operation time to the predicted inspection / repair time is a grace period (operation time) until the inspection / repair time.

  In addition, the pump management device 70 evaluates the urgent level of inspection / repair from the slope of the change of the measured value T ′ with respect to the total operation time. FIG. 6 is a graph showing the relationship between the slope of the change of the measured value T ′ with respect to the total operation time and the evaluation of the degree of urgency in the pump management device 70. As shown in FIG. 6, when the measured value T ′ does not change or is extremely small with respect to the total operation time, the pump management device 70 is in a stable state with no urgency and no need for inspection and repair for the time being. If the slope of the change of the measured value T ′ with respect to the total operation time is gentle, the pump management device 70 evaluates that the urgency is relatively low, and conversely, the measured value T When the gradient of change with respect to the total operation time is abrupt, the pump management device 70 evaluates the emergency state as having a relatively high degree of urgency.

  In the state of caution, since gradual deterioration is progressing, it is necessary to examine the time for planned inspection and repair. In this case, the timing of inspection and repair can be planned from the guidelines. The emergency state is an abnormal state in which rapid deterioration is in progress, and immediate inspection and repair are necessary.

  Note that the pump management device 70 may perform factor analysis when a failure occurs by using an emergency stop trend. Further, the control device 30 may prevent an inspection time determination error by separating normal data and abnormal data.

  The pump management device 70 switches the clutch 23 to the disengaged state, and after detecting that the load torque on the drive unit 24 side of the vertical pump P is not generated, the rotary body 31 undergoes free movement due to inertial force. The time until stopping may be the above stop time, or the time from when the operator turns off the switch (stop command) and starts the pump stop process until the rotating body 31 stops, that is, the stop After the command, the stop condition is adjusted, then the drive unit 24 is disconnected, and the time until the rotating body 31 finally stops may be set as the stop time.

  Further, in the example of FIGS. 5 and 6 above, the inspection / repair time is predicted and the urgency level is evaluated based on the stop time of the rotating body 31 with respect to the total operation time of the pump. The inspection / repair time may be predicted and the urgency level may be evaluated based on the stop time of the rotating body 31 with respect to the number of times or the stop time of the rotating body 31 with respect to the number of working days of the pump.

  As described above, according to the drainage pump station 100 of the present embodiment, the simple means of setting the pump stop condition to the same condition with reproducibility is in a state in which there is little influence from other equipment. Without pulling up the pump P, it is possible to grasp the damage of the parts of the impeller 17 and the underwater bearings 18-1, 18-2, and the trend management can be performed without selecting time maintenance in the inspection work plan.

  In the above embodiment, the pump management device 70 is provided with an alarm function, and when the stop time of the rotating body 31 falls below the threshold, and / or the period until the time when it is expected to fall below the threshold is a predetermined threshold. May be output from the pump management device 70. Moreover, an alarm device may be attached to the pump management device 70, a signal may be transmitted from the pump management device 70, and the alarm device may output an alarm.

  Moreover, in said embodiment, although the stop time when the load torque by the side of the drive machine 24 of the vertical pump P has not arisen is evaluated, when the drive machine 24 is an electric motor, a pump stop process is started. By recording the current value supplied to the previous motor in advance, it is possible to evaluate with high prediction accuracy. This is because when there is abnormal contact or the like, there is a possibility that the load is increased and the power is increased. In this case, information on the current value supplied to the drive machine 24 as an electric motor is given to the pump management apparatus 70.

DESCRIPTION OF SYMBOLS 1 Suction water tank 2 Pump installation floor 3 Discharge water tank 10 Suspension pipe 11 Bending discharge pipe 12 Discharge piping 13 Pump base 14 Pump casing 15 Suction bell mouth 16 Pump rotating shaft 17 Impeller 18-1, 18-2 Underwater bearing 19 Guide vane DESCRIPTION OF SYMBOLS 20 Outer bearing 21 Reduction gear 21a Rotation detection part 21b Reduction gear output shaft 23 Clutch 23a Input shaft 24 Drive device 24a Drive device output shaft 26 Discharge valve 27 Backflow prevention valve 30 Control device 31 Rotor 32 Water level sensor 70 Pump management device 71- DESCRIPTION OF SYMBOLS 1, 71-2 Temperature sensor 72-1, 72-2 Vibration sensor 73 Monitor 100 Drainage pump station 200 Pump management system

Claims (10)

A suction tank,
A vertical shaft pump comprising a rotating shaft as a rotating body and an impeller fixed to the rotating shaft, and discharging water in the suction water tank;
A drive for driving the rotating body of the vertical shaft pump;
Detecting means for detecting a predetermined stop condition for stopping the vertical shaft pump;
Transmission means for switching between a connection state in which the driving force from the driving machine is transmitted to the rotating body and a disconnected state in which the driving force from the driving machine is not transmitted to the rotating body;
A pump stop means for performing a pump stop process for stopping the vertical shaft pump when the stop condition is detected by the detection means;
Predictive means for predicting inspection / repair timing,
In a drainage pump station that drains through a discharge valve connected to a discharge pipe of the vertical shaft pump,
The pump stop means stops the vertical pump by switching the transmission means to the disconnected state as the pump stop step when the stop condition is detected by the detection means,
The drainage pump station, wherein the prediction means predicts the inspection / repair time based on a stop time until the rotation of the rotating body stops in the pump stop step.   2. The drainage pump station according to claim 1, wherein the stop time is a time from the start of the pump stop process until the rotation of the rotating body stops.   2. The drainage pump station according to claim 1, wherein the stop time is a time from when the transmission unit is switched to the cut state until the rotation of the rotating body stops. A suction tank,
A vertical shaft pump comprising a rotating shaft as a rotating body and an impeller fixed to the rotating shaft, and discharging water in the suction water tank;
A drive for driving the rotating body of the vertical shaft pump;
Detecting means for detecting a predetermined stop condition for stopping the vertical shaft pump;
Transmission means for switching between a connection state in which the driving force from the driving machine is transmitted to the rotating body and a disconnected state in which the driving force from the driving machine is not transmitted to the rotating body;
A pump stop means for performing a pump stop process for stopping the vertical shaft pump when the stop condition is detected by the detection means;
Predictive means for predicting inspection / repair timing,
In a drainage pump station that drains through a discharge valve connected to a discharge pipe of the vertical shaft pump,
The pump stop means stops the vertical pump by switching the transmission means to the disconnected state when the stop condition is detected by the detection means,
A sensor for measuring the state of the vertical pump is attached to the vertical pump at least in the pump stop step,
The prediction means predicts the inspection / repair time based on the state of the vertical pump measured by the sensor until the rotation of the rotating body stops in the pump stop step. .   The state of the vertical shaft pump in the pump stop process is a rotation speed, a bearing temperature, a bearing vibration, and / or an amplitude of vibration in the pump stop process. The drainage pumping station.   The said detection means detects that it is the stop water level of the said suction tank, and the said discharge valve is fully closed as the said stop conditions, It is any one of Claim 1 thru | or 5 characterized by the above-mentioned. The drainage pumping station. In a pump management method for predicting the inspection and repair timing of a vertical shaft pump including a rotating shaft and a rotating body that includes an impeller fixed to the rotating shaft and is driven to rotate,
When a predetermined stop condition for stopping the vertical pump is satisfied, a pump stop process for stopping the vertical pump is performed,
In the pump stop step, as a state in which the rotational driving force is not supplied to the rotating body, the stop time until the rotation of the rotating body stops,
A pump management method, wherein an inspection / repair time is predicted based on the measured stop time. In a pump management method for predicting the inspection and repair timing of a vertical shaft pump including a rotating shaft and a rotating body that includes an impeller fixed to the rotating shaft and is driven to rotate,
When a predetermined stop condition for stopping the vertical pump is satisfied, a pump stop process for stopping the vertical pump is performed,
In the pump stop step, the state of the pump in the pump stop step is measured as a state where no rotational driving force is supplied to the rotating body,
A pump management method characterized by predicting an inspection / repair time based on the measured state. A suction tank,
A vertical shaft pump comprising a rotating body and discharging water in the suction water tank;
A drive for driving the rotating body of the vertical shaft pump;
Detecting means for detecting a predetermined stop condition for stopping the vertical shaft pump;
A pump stop means for performing a pump stop process for stopping the vertical shaft pump when the stop condition is detected by the detection means;
A pump management system used in a drainage pump station equipped with
In the pump stop step, measuring means for measuring a stop time until the rotation of the rotating body stops;
Predicting means for predicting inspection / repair time based on the stop time measured by the measuring means;
A pump management system comprising: A suction tank,
A vertical shaft pump comprising a rotating body and discharging water in the suction water tank;
A drive for driving the rotating body of the vertical shaft pump;
Detecting means for detecting a predetermined stop condition for stopping the vertical shaft pump;
A pump stop means for performing a pump stop process for stopping the vertical shaft pump when the stop condition is detected by the detection means;
A pump management system used in a drainage pump station equipped with
Measuring means for measuring the state of the vertical shaft pump in the pump stopping step;
Predicting means for predicting the inspection / repair time based on the state measured by the measuring means;
A pump management system comprising:

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