JP5096405B2 - Pump device and method for managing vibration tendency of pump - Google Patents

Description

  The present invention relates to a pump device for pumping liquids such as river water and drainage, and a method for managing vibration tendency of the pump.

  One of the inspection and management items of the pump device is vibration measurement of the pump. The vibration of the pump is mainly caused by wear of the bearing that supports the rotating shaft. FIG. 1 is a schematic view showing a general vertical shaft pump. As shown in FIG. 1, the vertical shaft pump is installed on the pump installation floor 500 in the upper part of the water tank, and a casing 506 that houses the impeller 504 is suspended via the suspension pipe 502. The rotating shaft 509 is rotatably supported by the underwater bearing 508, and the impeller 504 and the rotating shaft 509 rotate integrally. Such a vertical shaft pump is operated in a state in which the underwater bearing 508 is immersed in water, and the underwater bearing 508 is gradually worn as the usage time elapses.

  As wear of the underwater bearing 508 progresses, the vibration of the pump increases. Therefore, by managing the vibration tendency of the pump, the progress of wear of the underwater bearing 508 can be grasped. Patent Document 1 discloses a method for detecting the degree of wear of an underwater bearing by measuring vibrations in the vicinity of the underwater bearing. According to this method, it is possible to predict when the underwater bearing should be replaced from the data by recording the transition of the measured value as data.

  However, when the water level of the suction water tank changes, the region where the water in the suction water tank is in contact with the casing changes, so that the natural frequency of the pump itself changes and the measured value of vibration changes. Further, as shown in FIG. 2, the operating point of the pump differs depending on the difference between the water level of the discharge water tank and the water level of the suction water tank, that is, the actual head. In other words, when the actual head changes, the pump discharge flow rate and shaft power differ. As a result, the force that water gives to the pump and the amount of energy that becomes vibration change, and the vibration of the pump differs. Thus, since the vibration of the pump varies depending on the actual head, the conventional method cannot manage the vibration tendency of the pump satisfactorily.

JP 2007-285253 A

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a pump device and a method capable of accurately managing the vibration tendency of the pump.

  In order to achieve the above-described object, one aspect of the present invention is a pump device that pumps up a liquid in a suction water tank. The pump device can rotate a rotating shaft, an impeller fixed to the rotating shaft, and the rotating shaft. A pump having a bearing to support, a liquid level meter that measures the liquid level position of the suction water tank, a vibration measuring instrument that measures the vibration of the pump, a recording device that records the measurement value of the vibration measuring instrument, and A recording control unit that starts and stops recording of the measurement value by the recording device, the recording control unit, when the discharge flow rate of the pump and the liquid level position of the suction water tank are respectively within a predetermined range, The measurement value is recorded on the recording device.

In a preferred aspect of the present invention, the recording control unit starts recording of the measurement value by the recording device when both the discharge flow rate and the liquid level position are within the predetermined range. When either one of the discharge flow rate and the liquid level position deviates from the predetermined range, the recording of the measurement value by the recording device is stopped.
In a preferred aspect of the present invention, the recording control unit stores a flow rate-total head curve of the pump and a plurality of pipe resistance loss curves corresponding to different actual heads. The actual head is calculated from the difference between the side liquid level position and the liquid level position of the suction water tank, and the discharge flow rate is calculated from the pipe resistance loss curve corresponding to the actual head and the flow rate-total head curve. And

A preferred aspect of the present invention further includes an operation hour meter indicating the total operation time of the pump, the recording device records the operation time when the measurement value is acquired together with the measurement value, and the recording control unit includes: An approximated curve showing a change in the measured value is created from the recorded measured value and the operation time, and a time when the measured value exceeds a predetermined threshold is predicted based on the approximated curve. .
In a preferred aspect of the present invention, the predetermined threshold value is a measured value of the vibration measuring instrument when the worn bearing is installed in the pump and operated.
A preferable aspect of the present invention further includes an electric discharge valve that adjusts the discharge flow rate, and the recording control unit operates the electric discharge valve to operate the discharge flow rate when the discharge flow rate is outside the predetermined range. Is within the predetermined range.

  Another aspect of the present invention is a method of managing the vibration tendency of a pump that pumps up liquid in a suction water tank by rotating an impeller through a rotating shaft that is rotatably supported by a bearing, wherein the suction The liquid level position of the water tank and the discharge flow rate of the pump are monitored, the vibration of the pump is measured, and the vibration level of the pump is measured when the discharge flow rate and the liquid level position of the suction water tank are within a predetermined range, respectively. The measurement value is recorded.

In a preferred aspect of the present invention, when both the discharge flow rate and the liquid level position fall within the predetermined range, recording of the measurement value is started, and either the discharge flow rate or the liquid level position is started. The recording of the measurement value is stopped when one of the values deviates from the predetermined range.
In a preferred aspect of the present invention, the actual head is calculated from the difference between the liquid level position on the discharge side and the liquid level of the suction water tank, the pipe line resistance loss curve corresponding to the actual head, and the flow rate-total head curve of the pump. The discharge flow rate is calculated from the above.

According to a preferred aspect of the present invention, the operation time at which the measurement value is acquired is recorded together with the measurement value, an approximate curve indicating the change in the measurement value is created from the recorded measurement value and the operation time, and the measurement The time when the value exceeds a predetermined threshold value is predicted based on the approximate curve.
In a preferred aspect of the present invention, the predetermined threshold is a measured value of the vibration when a worn bearing is installed in the pump and operated.
In a preferred aspect of the present invention, when the discharge flow rate is out of the predetermined range, an electric discharge valve is operated to keep the discharge flow rate within the predetermined range.

  According to the present invention, since vibration is measured under the same conditions, the tendency of pump vibration (that is, the progress of bearing wear) can be accurately managed. Therefore, it is possible to accurately determine the replacement time of the bearing. Also, instead of recording all the data during operation, the measured values are recorded only when the discharge flow rate and the liquid level position of the suction water tank are within predetermined ranges, respectively, so the capacity of the recording device is reduced. Can reduce costs.

It is a schematic diagram which shows a general vertical shaft pump. It is a graph which shows the relationship between a lift and discharge flow rate, and the graph which shows the relationship between shaft power and discharge flow rate. It is sectional drawing which shows the whole structure of the pump apparatus which concerns on the 1st Embodiment of this invention. 3 is a flowchart illustrating an operation of a recording control unit according to the first embodiment. Fig.5 (a) and FIG.5 (b) are figures which show the modification of the pump apparatus which concerns on 1st Embodiment. FIG. 6A and FIG. 6B are diagrams showing a modification of the pump device according to the first embodiment. It is sectional drawing which shows the whole structure of the pump apparatus which concerns on the 2nd Embodiment of this invention. It is a graph which shows the approximated curve created based on the recorded measured value. It is sectional drawing which shows the whole structure of the pump apparatus which concerns on the 3rd Embodiment of this invention. It is a graph which shows the flow volume-total head curve and pipeline resistance loss curve which are memorize | stored in the recording control part. It is sectional drawing which shows the whole structure of the pump apparatus which concerns on the 4th Embodiment of this invention. It is a flowchart which shows operation | movement of the recording control part which concerns on 4th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 is a cross-sectional view showing the overall configuration of the pump device according to the first embodiment of the present invention. The pump device according to the present embodiment relates to a vertical shaft pump, but the present invention is not limited to this, and the present invention can also be applied to a horizontal shaft pump and a slant shaft pump.

  The pump device according to the present embodiment has a vertical shaft pump that pumps water (handling liquid) from the suction water tank 40. As shown in FIG. 3, the vertical shaft pump includes an impeller casing 1 having a suction bell mouth 1a and a pump bowl 1b, a suspension pipe 3 for suspending the impeller casing 1 in a suction water tank 40, and an upper end of the suspension pipe 3 A discharge bend pipe 4 connected to the impeller casing 1, an impeller 10 accommodated in the impeller casing 1, and a rotating shaft (vertical axis) 6 to which the impeller 10 is fixed. The suspension pipe 3 extends downward through an insertion hole 24 formed in the pump installation floor 22 above the suction water tank 40 and is fixed to the pump installation floor 22 via a pump base 23 provided at the upper end of the suspension pipe 3. Is done. The rotary shaft 6 extends in the vertical direction through the discharge curved pipe 4, the suspension pipe 3, and the impeller casing 1. The pump casing 2 includes an impeller casing 1 and a suspension pipe 3.

  The suction bell mouth 1a opens downward, and the upper end of the suction bell mouth 1a is fixed to the lower end of the pump bowl 1b. The impeller 10 is fixed to the lower end of the rotating shaft 6, and the impeller 10 and the rotating shaft 6 rotate integrally. A plurality of guide vanes 14 are arranged above the impeller 10 (discharge side). These guide vanes 14 are fixed to the inner peripheral surface of the pump bowl 1b. The rotary shaft 6 is rotatably supported by the outer bearing 11 and the underwater bearings 12 and 15. The underwater bearing 12 is accommodated in the pump bowl 1 b and is located above the impeller 10. The underwater bearing 15 is accommodated in the suspension pipe 3. The outer bearing 11 is fixed to the discharge curved pipe 4. The support member 7 that supports the underwater bearing 12 is fixed to the inner surface of the bowl bush 13, and the bowl bush 13 is supported by the impeller casing 1 via a guide vane 14. A support member 17 that supports the underwater bearing 15 is fixed to the inner peripheral surface of the suspension pipe 3. The underwater bearings 12 and 15 are so-called sliding bearings that are in sliding contact with the rotary shaft 6. Reference numeral 19 denotes a handhole.

  The rotating shaft 6 protrudes upward from the discharge curved pipe 4 and is connected to a driving machine 18. When the impeller 10 is rotated via the rotating shaft 6 by the driving machine 18, the water in the suction water tank 40 is sucked from the suction bell mouth 1a and discharged through the pump bowl 1b, the suspension pipe 3, and the discharge curved pipe 4. It is transferred to the tube 8. The discharge pipe 8 is connected to the discharge water tank 41, and water flows from the discharge pipe 8 into the discharge water tank 41. The discharge pipe 8 is provided with a flow meter 28 for measuring the discharge flow rate of water. A water level gauge (liquid level gauge) 30 is disposed in the suction water tank 40, and the water level of the suction water tank 40 (hereinafter referred to as suction side water level) is measured by the water level gauge 30. During the vertical shaft pump operation, the impeller casing 1 that houses the impeller 10 and the underwater bearing 12 is located below the liquid level of the suction water tank 40.

  A conduit 35 for guiding a vibration meter (vibration measuring instrument) 34 to the vicinity of the underwater bearing 12 is installed on the side of the suspension pipe 3 and the impeller casing 1. That is, the conduit 35 is disposed beside the suspension pipe 3, and the lower end of the conduit 35 is located in the vicinity of the impeller casing 1 that supports the underwater bearing 12, and the upper end of the conduit 35 is above the pump installation floor 22. positioned. The lower end of the conduit 35 and the impeller casing 1 are connected to each other by a connecting member 38. The vibrometer 34 is inserted into the conduit 35 from the upper end of the conduit 35 and lowered to the lower end of the conduit 35 by a cable 36 or a suspension wire (not shown).

  The vibration meter 34 measures the vibration of the vertical pump transmitted through the connecting member 38. A recording device 45 is connected to the cable 36, and the measurement value of the vibrometer 34 is sent to the recording device 45 through the cable 36. The recording device 45 records the measurement values (amplitude value, vibration speed, vibration acceleration, etc.) of the vibrometer 34 as data.

  Further, a conduit 52 for guiding the vibrometer 51 to the vicinity of the underwater bearing 15 is installed on the side of the suspension pipe 3. That is, the conduit 52 is disposed beside the suspension pipe 3, and the lower end of the conduit 52 is located in the vicinity of the support member 17 that supports the underwater bearing 15, and the upper end of the conduit 52 is above the pump installation floor 22. positioned. The lower end of the conduit 52 and the suspension pipe 3 are connected to each other by a connecting member 54. The vibrometer 51 is inserted into the conduit 52 from the upper end of the conduit 52 and lowered to the lower end of the conduit 52 by a cable 53 or a suspension wire (not shown). The cable 53 is connected to the recording device 45 described above. The vibrometer 51 measures the vibration of the vertical pump transmitted through the connecting member 54, and the measured value is sent to the recording device 45 through the cable 53. The recording device 45 records the measurement values (amplitude value, vibration speed, vibration acceleration, etc.) of the vibrometer 51 as data.

  A recording control unit 46 that controls the recording operation of the recording device 45 is connected to the recording device 45. The water level meter 30 and the flow meter 28 described above are electrically connected to the recording control unit 46, and the measured values of the water level meter 30 and the flow meter 28 (that is, the suction side water level and the discharge flow rate) are recorded in the recording control unit 46. To be sent to. The recording control unit 46 monitors the suction-side water level and the discharge flow rate during the operation of the vertical pump, and when these values are within a predetermined range, the measured values of the vibration meters 34 and 51 are stored in the recording device 45. It is supposed to be recorded. More specifically, the recording control unit 46 stores a preset water level range and flow rate range, and whether the suction side water level and the discharge flow rate are within the set water level range and the set flow rate range, respectively. Judging. When the suction side water level is within the set water level range and the discharge flow rate is within the set flow range, the recording control unit 46 causes the recording device 45 to record the measurement values of the vibrometers 34 and 51. Yes.

  Hereinafter, the operation of the recording control unit 46 will be described in detail with reference to FIG. When the operation of the pump is started, the recording control unit 46 monitors the measurement values transmitted from the water level meter 30 and the flow meter 28, that is, the suction side water level and the discharge flow rate. Then, the recording control unit 46 starts the vibration measurement of the vertical pump by the vibrometers 34 and 51 when the suction side water level and the discharge flow rate enter both of the set water level range and the set flow rate range described above, and records them. Recording of vibration measurement values by the device 45 is started. When the suction side water level deviates from the set water level range, or when the discharge flow rate deviates from the set flow range, the recording control unit 46 stops the measurement of the vibration of the vertical pump by the vibrometers 34 and 51, and the recording device 45 Stop recording vibration measurements.

  According to this embodiment, vibration (amplitude, vibration speed, vibration acceleration, etc.) is measured only when the suction side water level and the discharge flow rate are within the predetermined ranges. That is, since the vibration of the vertical shaft pump is measured under substantially the same conditions, the tendency of vibration can be accurately managed from the measured value. As the wear of the underwater bearings 12 and 15 progresses, the vibration of the vertical shaft pump increases. Therefore, the degree of wear of the underwater bearings 12 and 15 can be determined from the measured vibration value. Furthermore, it is possible to accurately estimate the replacement time of the underwater bearings 12 and 15 from the tendency of the measured values. Further, according to the present embodiment, only the measurement value acquired under the specific condition described above is recorded, so that the storage capacity of the recording device 45 can be reduced. The recording device 45 may record the measurement date and time, the discharge flow rate, the suction side water level, and the like in association with the measurement value.

  The vibration measurement location is not limited to the vicinity of the underwater bearings 12 and 15. For example, as shown in FIG. 5A, the vibration of the outer bearing 11 may be measured. In this case, as shown in FIG. 5A, the vibration measuring instrument 34 may be directly attached to the outer bearing 11, or the vibration measuring instrument 34 may be attached via a connecting member. Further, as shown in FIG. 5B, a seat 60 is attached to the outer peripheral surface of the casing 2 (the suspension pipe 3) at a position just below the pump base 23, and the vibration measuring instrument 34 is attached to the seat 60. It may be attached. In the example shown in FIG. 5B, a through hole 62 extending in the vertical direction is formed in the pump base 23, and a protective tube 63 extending from the through hole 62 to the seat 60 is provided. Note that the vibration measuring instrument 34 may be directly attached to the outer peripheral surface of the suspension tube 3 without providing the seat 60.

  Further, as shown in FIG. 6A, a seat 60 formed of a rigid body extending from the casing 2 (suspending pipe 3) to the pump base 23 is attached to the hanging pipe 3, and the end of the seat 60 is attached. A vibration measuring instrument 34 may be installed. Further, as shown in FIG. 6B, the vibration measuring instrument 34 may be directly or indirectly attached to the pump base 23. The examples shown in FIGS. 5 (a), 5 (b), 6 (a), and 6 (b) may be combined as appropriate, and these examples may be combined with the example shown in FIG. Moreover, the vibration measuring instrument installed may be one or plural.

  Next, a second embodiment of the present invention will be described. FIG. 7 is a cross-sectional view showing the overall configuration of the pump device according to the second embodiment of the present invention. Note that the configuration and operation of the present embodiment that are not specifically described are the same as those of the first embodiment described above, and thus redundant description thereof is omitted. As shown in FIG. 7, the pump device according to the present embodiment has an operation hour meter 70 indicating the total operation time (integrated operation time) of the pump. The operation hour meter 70 starts the accumulation of operation time when the pump operation is started, and stops the accumulation of operation time when the pump operation is stopped. The recording device 45 records the operation time when the measurement value is acquired together with the measurement value of the vibration measuring instrument. And the recording control part 46 monitors the change of the measured value accompanying progress of operation time. Specifically, as shown in FIG. 8, the recording control unit 46 is on a graph in which the operation time is on the horizontal axis and the physical quantity indicating the magnitude of vibration (amplitude, vibration speed, vibration acceleration, etc.) is on the vertical axis. Create an approximate curve of the recorded measurements. The approximate curve can be created using a known method such as regression analysis.

  A predetermined threshold value is set in the recording control unit 46. This threshold value is a value indicating the replacement time of the underwater bearings 12 and 15 and is determined according to the specifications of the underwater bearings 12 and 15 to be used. Since the vibration of the vertical shaft is mainly caused by the swing of the rotary shaft 6 due to the wear of the underwater bearings 12 and 15, the large measured value of the vibration measuring instrument means the degree of wear of the underwater bearings 12 and 15 is large. It means that. Therefore, the recording control unit 46 can predict when the measured value exceeds the threshold value from the created approximate curve and the set threshold value.

  The magnitude of the vibration of the pump can vary depending on the structure of the pump and the installation state of the pump. Therefore, in order to accurately determine the replacement timing, the above-described threshold value may be a vibration value measured in a state where an underwater bearing that has been worn to the extent that replacement is necessary is actually attached to the pump. preferable. In this case, the worn underwater bearing may not be an actually worn underwater bearing, but may be an underwater bearing that simulates a worn state. As described above, by using the threshold value based on the actual measurement, it is possible to determine an accurate submerged bearing replacement time according to the structure and installation state of the pump. In this case, it is preferable to obtain a plurality of threshold values using a plurality of underwater bearings having different degrees of wear. By acquiring a plurality of threshold values according to the degree of each wear, the correlation between vibration and wear becomes clear, and the wear state of the underwater bearing can be determined from the measured vibration value.

  Next, a third embodiment of the present invention will be described. FIG. 9 is a cross-sectional view showing the overall configuration of a pump device according to the third embodiment of the present invention. Note that the configuration and operation of the present embodiment that are not specifically described are the same as those of the first or second embodiment described above, and thus redundant description thereof is omitted. The pump device according to the present embodiment does not measure the discharge flow rate using the flow meter 28, but calculates the discharge flow rate using a flow rate-total head curve and a pipeline resistance loss curve. This is different from the second embodiment.

  As shown in FIG. 9, the discharge water tank 41 is provided with a water level gauge (liquid level gauge) 31 for measuring the water level of the discharge water tank 41 (hereinafter referred to as the discharge side water level). The measurement value of the water level gauge 31 is transmitted to the recording control unit 46. As shown in FIG. 10, the recording control unit 46 stores a flow rate-total head curve that is a pump performance curve and a plurality of pipeline resistance loss curves corresponding to different actual heads. The recording control unit 46 calculates the actual head from the difference between the discharge-side water level and the suction-side water level, and calculates the operating point from the pipeline resistance loss curve corresponding to the actual head and the flow-total head curve. The discharge flow rate at this operating point is the calculated discharge flow rate in the actual head. The discharge flow rate obtained in this way is monitored by the recording control unit 46 as in the above-described embodiment. The recording device 45 may record the measurement date and time, the discharge flow rate, the suction side water level, the discharge side water level, and the like in association with the measurement value.

  Next, a fourth embodiment of the present invention will be described. FIG. 11 is a cross-sectional view showing the overall configuration of a pump device according to the fourth embodiment of the present invention. Note that the configuration and operation of the present embodiment that are not specifically described are the same as those of the first, second, or third embodiment described above, and thus redundant description thereof is omitted. As shown in FIG. 11, the pump device according to this embodiment includes an electric discharge valve 72 that adjusts the discharge flow rate. The electric discharge valve 72 is provided in the discharge pipe 8. The electric discharge valve 72 is electrically connected to the recording control unit 46 and operates in response to a command from the recording control unit 46.

  Similar to the embodiment described above, the recording control unit 46 determines whether or not the discharge flow rate is within the set flow rate range during operation of the pump. If the discharge flow rate is outside the set flow rate range, the recording control unit 46 operates the electric discharge valve 72 so that the discharge flow rate falls within the set flow rate range. FIG. 12 is a flowchart showing the operation of the recording control unit 46 according to the present embodiment. When the operation of the pump is started, the recording control unit 46 monitors the discharge flow rate obtained by actual measurement or calculation. When the discharge flow rate is not within the set flow rate range, the recording control unit 46 determines whether or not the discharge flow rate is larger than the upper limit value of the set flow rate range. When the discharge flow rate is larger than the upper limit value of the set flow rate range, the recording control unit 46 operates the electric discharge valve 72 in the closing direction. On the other hand, when the discharge flow rate is smaller than the upper limit value of the set flow rate range (that is, when the discharge flow rate is smaller than the lower limit value of the set flow rate range), the recording control unit 46 operates to open the electric discharge valve 72. If comprised in this way, the data for management of the vibration tendency of a vertical shaft pump can be acquired regularly and reliably, and the management precision of a vibration tendency can be improved.

  Note that if the electric discharge valve 72 is opened and closed based on the above control operation during normal pump operation, there is a possibility that the predetermined discharge flow rate required for the vertical shaft pump cannot be achieved. Therefore, in order to prevent the electric discharge valve 72 from opening and closing during normal drainage operation, the recording control unit 46 preferably has a function capable of stopping the control operation. For example, the recording control unit 46 is provided with a switch that switches between a measurement mode in which the electric discharge valve 72 is operated according to the control operation and a normal operation mode in which the electric discharge valve 72 is not operated, and the switch is operated at the operator's discretion. It is preferable to make it.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

DESCRIPTION OF SYMBOLS 1 Impeller casing 1a Suction bell mouth 1b Pump bowl 2 Pump casing 3 Suspension pipe 4 Discharge curved pipe 6 Rotating shaft 7 Support member 8 Discharge pipe 10 Impeller hub 10a Impeller hub 10b Impeller 11 Outer bearing 12, 15 Underwater bearing 13 Bowl bush 14 Guide Vane 17 Support member 18 Drive 19 Hand hole 22 Pump installation floor 23 Pump base 24 Pump insertion hole 28 Flow meter 30, 31 Water level meter 34, 51 Vibrometer 35, 52 Pipe 36, 53 Cable 38, 54 Connecting member 40 Suction water tank 41 Discharge water tank 45 Recording device 46 Recording control part 60 Seat 70 Operation hour meter 72 Electric discharge valve

Claims (12)

A pump device for pumping the liquid in the suction water tank,
A pump having a rotating shaft, an impeller fixed to the rotating shaft, and a bearing that rotatably supports the rotating shaft;
A liquid level gauge for measuring the liquid level of the suction water tank;
A vibration measuring instrument for measuring the vibration of the pump;
A recording device for recording measurement values of the vibration measuring instrument;
A recording control unit for starting and stopping recording of the measurement value by the recording device,
The said recording control part makes the said recording device record the said measured value, when the discharge flow rate of the said pump and the liquid level position of the said suction water tank are in a predetermined range, respectively, The pump apparatus characterized by the above-mentioned.   The recording control unit starts recording of the measurement value by the recording device when both the discharge flow rate and the liquid level position fall within the predetermined range, and the discharge flow rate and the liquid level position 2. The pump device according to claim 1, wherein recording of the measurement value by the recording device is stopped when any one of the values deviates from the predetermined range. The recording control unit stores a flow rate-total head curve of the pump and a plurality of pipeline resistance loss curves corresponding to different actual heads,
The recording control unit calculates the actual head from the difference between the liquid level position on the discharge side and the liquid level of the suction water tank, and discharges from the line resistance loss curve corresponding to the actual head and the flow rate-total head curve. The pump device according to claim 1, wherein a flow rate is calculated. An operation hour meter indicating the total operation time of the pump;
The recording device records the operation time when the measurement value is acquired together with the measurement value,
The recording control unit creates an approximate curve indicating a change in the measured value from the recorded measured value and the operation time, and predicts a time when the measured value exceeds a predetermined threshold based on the approximate curve. The pump device according to any one of claims 1 to 3, wherein:   The pump device according to claim 4, wherein the predetermined threshold value is a measured value of the vibration measuring instrument when a worn bearing is installed and operated in the pump. An electric discharge valve for adjusting the discharge flow rate;
2. The pump according to claim 1, wherein the recording control unit operates the electric discharge valve to keep the discharge flow rate within the predetermined range when the discharge flow rate is outside the predetermined range. apparatus. A method for managing the vibration tendency of a pump that pumps up liquid in a suction water tank by rotating an impeller through a rotating shaft rotatably supported by a bearing,
Monitor the liquid level position of the suction water tank and the discharge flow rate of the pump,
Measuring the vibration of the pump,
A method of recording a measured value of vibration of the pump when the discharge flow rate and the liquid level position of the suction water tank are within predetermined ranges, respectively. When both the discharge flow rate and the liquid level position are within the predetermined range, recording of the measurement value is started,
The method according to claim 7, wherein recording of the measurement value is stopped when any one of the discharge flow rate and the liquid level position deviates from the predetermined range. Calculate the actual head from the difference between the liquid level position on the discharge side and the liquid level position of the suction water tank,
9. The method according to claim 7, wherein a discharge flow rate is calculated from a line resistance loss curve corresponding to the actual lift and a flow rate-total lift curve of the pump. Record the operation time when the measured value was acquired together with the measured value,
From the recorded measurement value and the operation time, create an approximate curve showing the change of the measurement value,
The method according to any one of claims 7 to 9, wherein the time when the measured value exceeds a predetermined threshold is predicted based on the approximate curve.   11. The method according to claim 10, wherein the predetermined threshold is a measured value of the vibration when a worn bearing is installed in the pump and operated.   The method according to any one of claims 7 to 11, wherein when the discharge flow rate is outside the predetermined range, an electric discharge valve is operated to keep the discharge flow rate within the predetermined range. .

Images