JP7624873B2 - Vibration diagnostic device for pump station system piping - Google Patents

Description

The present invention relates to a vibration diagnostic device for pump station system piping.

Conventionally, pumping stations that operate during heavy rains and other times to prevent flooding have been known. In such pumping stations, reliable operation during floods is necessary, and management and monitoring of the main pump and its auxiliary equipment is essential to ensure the soundness of the entire facility. The following Patent Document 1 discloses a pump inspection method that uses an image acquisition means to inspect the main pump. Furthermore, the following Patent Document 2 discloses a pump management method that predicts the timing of inspection and repair of the main pump based on the stoppage time of the main pump.

JP 2009-41503 A JP 2019-23473 A

As in the above-mentioned conventional technology, various methods have been disclosed for the maintenance and inspection of main pumps, but the current situation is that no effective method has yet been established for the maintenance and inspection of auxiliary system piping (especially small piping). Conventionally, pumping stations have conducted regular maintenance operations in preparation for drainage operations during floods, but when there is no water to drain or in an environment where drainage is not possible, only visual inspections of the appearance of the auxiliary equipment and confirmation of its operation are conducted without operating the main pump.

By simply visually inspecting the appearance of the auxiliary equipment or checking its operation, it is difficult to notice abnormalities such as when the auxiliary equipment's system piping is starting to become clogged with dirt or rust, when the system piping is starting to become thin or pitted due to corrosion, or when cracks are starting to appear in the system piping due to aging or collision with foreign objects, and the discovery of such abnormalities can be delayed. This problem is also true when the main pump is able to drain during maintenance operations.

The present invention was made in consideration of the above problems, and aims to provide a vibration diagnostic device for pump station system piping that can detect abnormalities and signs of abnormalities in the system piping of auxiliary equipment at a pump station.

A vibration diagnosis device for pump station system piping according to one aspect of the present invention is provided in a pump station in which a main pump and an auxiliary machine that operates the main pump are provided, and includes a vibration device that vibrates a specific location of the auxiliary machine's system piping, a measurement device that measures the vibration of the system piping caused by the vibration, and a data processing device that diagnoses the system piping based on measurement data from the measurement device.

In the above-mentioned pump station system piping vibration diagnostic device, the system piping may include at least one of the following: a cooling water system piping that supplies cooling water to the drive unit of the main pump, a water filling system piping that fills the main pump with priming water, a sealing water system piping that supplies sealing water liquid to the shaft seal of the main pump, a compressed air system piping that supplies compressed air to the drive unit of the main pump, and a drainage system piping of the pump station.

In the above-mentioned vibration diagnostic device for pump station system piping, the vibration device may periodically vibrate a specific portion of the system piping.

In the above-mentioned vibration diagnostic device for pump station system piping, the vibration device may drop a weight to vibrate a specific portion of the system piping.

In the above-mentioned vibration diagnostic device for pump station system piping, the vibration device may include a rope for suspending the weight, a hoist for winding up the rope, a power supply unit for supplying power to the hoist, and a timer switch for cutting off the supply of power from the power supply unit to the hoist after a predetermined time has elapsed since the hoist started to wind up, causing the weight of the weight to unwind the rope and drop the weight into the system piping.

In the above-mentioned pump station system piping vibration diagnostic device, the vibration device may be provided with a second timer switch that resumes the supply of power from the power supply unit to the hoisting machine a predetermined period after the supply of power from the power supply unit to the hoisting machine is cut off.

In the above-mentioned vibration diagnostic device for pump station system piping, the vibration device may be provided at a specific location on the system piping and may include a tubular portion that guides the fall of the weight.

In the above-mentioned vibration diagnostic device for pump station system piping, the vibration device may rotate an arm to vibrate a specific portion of the system piping.

In the vibration diagnostic device for the pump station system piping, the vibration device includes a support shaft that rotatably supports the arm, a first weight provided on one end side of the arm relative to the support shaft, a receiving tray portion provided on the other end side of the arm relative to the support shaft, and a weight adding device that adds a second weight to the receiving tray portion, and the receiving tray portion may be provided with an outlet for discharging the second weight when the arm rotates around the support shaft due to the second weight and the one end side of the arm is lower than the other end side.

In the above-mentioned vibration diagnostic device for pump station system piping, the vibration device may include a spring that biases the arm toward the system piping, an actuator that moves the arm away from the system piping and charges the spring, a power supply unit that supplies power to the actuator, and a timer switch that cuts off the supply of power from the power supply unit to the actuator a predetermined time after the actuator starts to operate, rotates the arm by the bias of the spring, and causes the arm to collide with the system piping.

In the above-mentioned pump station system piping vibration diagnostic device, the vibration device may be provided with a second timer switch that resumes the supply of power from the power supply unit to the actuator a predetermined period after the supply of power from the power supply unit to the actuator is cut off.

In the above-mentioned vibration diagnosis device for pump station system piping, the data processing device may diagnose the system piping by comparing the measurement data of the measurement device with measurement data previously measured by the measurement device.

In the above-mentioned pump station system piping vibration diagnostic device, the vibration points at which the system piping is vibrated may include at least one of the following: a connection between the pipes of the system piping, a space between the connection and an adjacent connection, a piping support supporting the system piping, and a space between the piping support and an adjacent piping support.

In the above-mentioned vibration diagnostic device for pump station system piping, the specific location of the system piping may include a location in the system piping where water constantly accumulates.

In the above-mentioned vibration diagnostic device for pump station system piping, the specific location of the system piping may include the location of the system piping that is installed at the lowest position.

In the above-mentioned pump station system piping vibration diagnosis device, the data processing device may perform frequency analysis of the measurement data of the measurement device to diagnose the system piping.

According to one aspect of the present invention, it is possible to provide a vibration diagnostic device for pump station system piping that can detect abnormalities or signs of abnormalities in auxiliary system piping at a pump station.

FIG. 1 is an overall configuration diagram of a pump station according to a first embodiment. FIG. 2 is an explanatory diagram showing a specific location of system piping of a cooling water system according to the first embodiment. 2 is an explanatory diagram showing a specific location of system piping of the seal water system according to the first embodiment. FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. FIG. 2 is an explanatory diagram showing a specific location of system piping in a water-filled system according to the first embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. 1 is an explanatory diagram showing a vibration diagnosis device for a pump station system piping according to a first embodiment; FIG. FIG. 2 is an explanatory diagram showing preferred vibration points in the vibration diagnosis device for pump station system piping according to the first embodiment. 4A to 4C are explanatory diagrams illustrating the operation of the vibration device according to the first embodiment. 4 is a flowchart illustrating an operation of the vibration device according to the first embodiment. 4 is a graph showing frequency analysis of measurement data (initial measurement data) of a measurement device performed by the data processing device according to the first embodiment. 4 is a graph showing frequency analysis of measurement data (measurement data when an abnormality occurs) of a measurement device performed by the data processing device according to the first embodiment. FIG. 13 is an explanatory diagram showing a vibration diagnosis device for a pump station system piping according to a modified example of the second embodiment. FIG. 13 is an explanatory diagram showing a vibration diagnosis device for a pump station system piping according to a modified example of the second embodiment. FIG. 11 is an explanatory diagram showing a vibration diagnosis device for a pump station system piping according to a second embodiment. 13A to 13C are explanatory diagrams illustrating the operation of a vibration device according to a modified example of the second embodiment. FIG. 13 is an explanatory diagram showing a vibration diagnosis device for a pump station system piping according to a modified example of the second embodiment. FIG. 13 is an explanatory diagram showing a vibration diagnosis device for a pump station system piping according to another embodiment. FIG. 13 is an explanatory diagram showing a vibration diagnosis device for a pump station system piping according to another embodiment.

The following describes a vibration diagnostic device for pump station system piping according to one embodiment of the present invention with reference to the drawings. In the following description, a pump station that operates for the purpose of preventing flooding during heavy rains, etc., is given as an example of an application of the present invention.

First Embodiment
FIG. 1 is an overall configuration diagram of a pump station 1 according to a first embodiment.
1 includes a plurality of main pumps 10 and a plurality of auxiliary machines 20 that operate the main pumps 10. The pump station 1 includes four horizontal shaft pumps as the main pumps 10. The pump station 1 also includes a vacuum pump 21, a fuel transfer pump 22, an air compressor 23, a cooling water pump 24, a seal water pump 25, and the like as the auxiliary machines 20.

The main pump 10 is a horizontal shaft pump with an impeller attached to a main shaft extending laterally (horizontally). The main pump 10 may also be a vertical shaft pump with an impeller attached to a main shaft extending vertically (vertically). The main pump 10 is driven by a drive unit 15. The drive unit 15 includes a rotating machine 4 equipped with an internal combustion engine (such as a diesel engine) and a reducer 5 connected to the rotating machine 4.

The drive shaft of the rotating machine 4 is connected to the reducer 5, which is connected to the main shaft of the main pump 10. By driving the rotating machine 4, the main shaft of the main pump 10 rotates via the reducer 5, and the rotation of the impeller attached to the main shaft pumps water from a suction tank (not shown), which is then discharged into a discharge tank (not shown).

The vacuum pump 21 constitutes a water-filling system 30 that draws in air from the main pump 10 when the main pump 10 is started, and fills the main pump 10 with priming water. The vacuum pump 21 is connected to the main pump 10 via system piping 30a. The system piping 30a is provided with a water-filling detector 14 for detecting when the main pump 10 is full of priming water, and an intake valve 31 (motor valve or solenoid valve) for opening and closing the system piping 30a.

The vacuum pump 21 is driven by an electric motor 21a. This vacuum pump 21 is, for example, a water-sealed vacuum pump, and is connected to a water supply pipe 32 that supplies makeup water on its intake side, and to an exhaust pipe 33b that exhausts the sucked air on its exhaust side. The water supply pipe 32 is connected to a water tank 34, and is provided with a water supply valve 35 (usually a manual valve) that opens and closes the water supply pipe 32.

The fuel transfer pump 22 pumps up fuel for the rotating machine 4. This fuel transfer pump 22 is driven by an electric motor 22a. The fuel transfer pump 22 is provided in the fuel supply pipe 40. In the fuel supply pipe 40, the fuel transfer pump 22 drives the fuel to pump up fuel from the underground oil tank 6 that stores the fuel to the fuel dispensing tank 7 installed at a predetermined height above ground, and the fuel is supplied from the fuel dispensing tank 7 to the rotating machine 4. By storing fuel in the fuel dispensing tank 7, it is possible to supply fuel to the rotating machine 4 at the required supply pressure even when the fuel transfer pump 22 is not driven.

The air compressor 23 constitutes a compressed air system 50 that supplies compressed air to the rotating machine 4 of the main pump 10. The air compressor 23 is connected to the air tank 8 via system piping 50a. The air compressor 23 fills the air tank 8 with compressed air (starting air) to start the rotating machine 4. This air compressor 23 is driven by an electric motor 23a. In the system piping 50a, compressed air compressed by driving the air compressor 23 fills the air tank 8, and the compressed air is supplied from the air tank 8 to the rotating machine 4. By storing compressed air in the air tank 8, the compressed air can be supplied to the rotating machine 4 to start it up.

The cooling water pump 24 constitutes a cooling water system 60 that supplies cooling water to the drive unit 15 that drives the main pump 10. This cooling water pump 24 is driven by an electric motor 24a. The cooling water pump 24 is connected to the heat exchanger 9 of the drive unit 15 via system piping 60a. The heat exchanger 9 shown in FIG. 1 is provided in the rotating machine 4, but may also be provided in the reduction gear 5. In the system piping 60a, cooling water is pumped up from the cooling water tank 61 by the driving of the cooling water pump 24, and the cooling water is supplied to the heat exchanger 9 of each drive unit 15. In the system piping 60a, the cooling water supplied to the heat exchanger 9 returns to the cooling water tank 61 and circulates.

Raw water (river water, etc.) is supplied to the cooling water tank 61 via system piping 60b. A water intake pump 72 is provided in the system piping 60b. This water intake pump 72 is driven by an electric motor 72a. In the system piping 60b, raw water is taken from the water intake pit 71 by driving the water intake pump 72, and the raw water from which foreign matter such as sand and mud has been removed using filtering devices such as a strainer 73 and a sand separator 74 is supplied to the cooling water tank 61.

In addition to the cooling water pump 24, the cooling water tank 61 is provided with a seal water pump 25. The seal water pump 25 constitutes a seal water system 80 that supplies seal water liquid to the shaft seal portion 16 of the main pump 10. The seal water pump 25 is driven by an electric motor 25a. The seal water pump 25 is connected to the shaft seal portion 16 of the main pump 10 via system piping 80a. The system piping 80a is provided with a seal water valve 81 (electric valve or solenoid valve) that opens and closes a branch pipe 81a connected to the shaft seal portion 16 of each main pump 10. In the system piping 80a, seal water liquid is pumped up from the cooling water tank 61 by driving the seal water pump 25, and the seal water liquid is supplied to the shaft seal portion 16 of each main pump 10.

FIG. 2 is an explanatory diagram showing a specific location W of the system piping 60a of the cooling water system 60 according to the first embodiment.
As shown in Fig. 2, the system piping 60a of the cooling water system 60 has an upstream piping that runs from the cooling water tank 61 to the drive unit 15 (heat exchanger 9) in the building of the pump station 1, and a downstream piping that runs from the drive unit 15 (heat exchanger 9) to the cooling water tank 61. The drive unit 15 shown in Fig. 2 is installed on the installation floor 2 in the same building as the main pump 10 (in the case of a horizontal shaft pump).

The upstream piping of the system piping 60a is provided with, in order from the upstream side, a cooling water pump 24, a check valve 62, and an on-off valve 63. Therefore, while the cooling water pump 24 is stopped, a specific location W where water always accumulates is generated downstream (secondary side) of the check valve 62 in the upstream piping of the system piping 60a unless the water is drained.

An automatic air vent valve 64 is provided on the downstream pipe of the system pipe 60a to prevent the water flow from continuing due to the siphon principle after the cooling water pump 24 is stopped. Therefore, the downstream pipe of the system pipe 60a is filled with water while the cooling water pump 24 is operating, and is empty while the cooling water pump 24 is stopped.

Fig. 3 is an explanatory diagram showing a specific location W of the system piping 80a of the seal water system 80 according to the first embodiment. Fig. 4 is a cross-sectional view taken along line IV-IV shown in Fig. 3.
As shown in Figures 3 and 4, a portion of the system piping 80a of the sealing water system 80 is placed in a pit 2a provided on the installation floor 2 within the building of the pump station 1 in order to ensure a maintenance passage within the building.

As shown in FIG. 3, the pit 2a is a groove that is lower than the floor surface of the installation floor 2, and its opening is covered by a pit cover 2b. As shown in FIG. 4, the system piping 80a is bent into a U-shape and placed in the pit 2a. Therefore, while the seal water pump 25 is stopped, a specific location W where water always accumulates is generated in at least the part of the system piping 80a that is placed in the pit 2a, unless the water is drained. The part of the system piping 80a that is placed in the pit 2a also corresponds to the specific location L that is the lowest installed location in the system piping 80a.

5 is an explanatory diagram showing a specific location L of the system piping 30a of the full water system 30 according to the first embodiment. FIG 6 is a cross-sectional view taken along the line VI-VI shown in FIG 5.
5, the system piping 30a of the full-water system 30 is connected to the upper part of the main pump 10. Air is sucked into the system piping 30a by the vacuum pump 21, and when the main pump 10 becomes full, the float of the full-water detector 14 blocks the air intake.

As shown in FIG. 6, this system piping 30a may also be placed in a pit 2a provided in the installation floor 2 to ensure a maintenance passageway within the building. The portion of the system piping 30a that is placed in the pit 2a corresponds to a specific point L that is the lowest installation position of the system piping 30a.

When the float of the full water detector 14 cuts off the water, air containing a small amount of water may be drawn in just before the water is cut off, causing water to enter the system piping 30a. In addition, due to changes in temperature, humidity, and pressure, the saturated vapor pressure may be exceeded and water may be generated in the system piping 30a. Such water tends to accumulate at a specific point L, which is the lowest installed position in the system piping 30a.

Next, we will explain the vibration diagnosis device 200 for pump station system piping, which can effectively diagnose abnormalities and their precursors at specific locations W and L where water constantly accumulates and/or where water is likely to accumulate and rust and corrosion are likely to occur, as described above.

FIG. 7 is an explanatory diagram showing a vibration diagnosis device 200 for a pump station system piping according to the first embodiment.
As shown in FIG. 7 , the vibration diagnosis device 200 includes a vibration device 201 that vibrates a specific location of the system piping 100 of the above-mentioned auxiliary device 20, a measuring device 202 that measures the vibration of the system piping 100 caused by the vibration, and a data processing device 203 that diagnoses the system piping 100 based on the measurement data of the measuring device 202.

The system piping 100 to be diagnosed includes at least one of the system piping 60a of the cooling water system 60 that supplies cooling water to the drive unit 15 of the main pump 10, the system piping 30a of the water filling system 30 that fills the main pump 10 with priming water, the system piping 80a of the sealing water system 80 that supplies sealing water liquid to the shaft seal portion 16 of the main pump 10, the system piping 50a of the compressed air system 50 that supplies compressed air to the drive unit 15 of the main pump 10, and the system piping of the drainage system (not shown) of the pump station 1, as shown in FIG. 1 above. The system piping of the drainage system includes the on-site drainage piping when a floor drain pump is installed to drain miscellaneous water from the pump station 1, and the drainage piping for draining drainage from various pumps of the main pump 10 and the auxiliary equipment 20.

The vibration device 201 of this embodiment drops a weight 210 to vibrate a specific location of the system piping 100. Specifically, the vibration device 201 includes a rope 220 that suspends the weight 210, and a hoist 230 that winds up the rope 220. The hoist 230 includes a hoist drum 231 that winds up the rope 220, a pair of pivot supports 232 that pivotally support the hoist drum 231, and an electric motor 233 that rotates the hoist drum 231. There is no particular specification for the method of fixing the rope 220 to the hoist drum 231, and the rope 220 may be fixed with a set screw or may be glued. The specifications of the electric motor 233 are not specified, but a relatively slow rotation motor is preferable.

The shape, specifications, and features of the weight 210 should be selected to be suitable for striking the system piping 100. The measuring device 202 measures the impact sound or vibration when the weight 210 is dropped to strike the system piping 100. The measuring device 202 is a sound level meter that measures the impact sound emitted from the system piping 100, a vibrometer that measures the vibration of the system piping 100, or the like, and the performance (precision) of the measuring device should be selected to be suitable for measuring the impact sound or vibration of the system piping 100.

The diameter, material, shape, and thickness of the system piping 100 are not specified, but most of the system piping 100 is carbon steel pipes such as SGP, SGPW, STPG, stainless steel pipes such as SUS pipes, or copper pipes. The system piping 100 is also a circular pipe (so-called small pipe) with a diameter of about 8A to 300A (8mm to 300mm) according to the JIS standard.

The system piping 100 includes a connection portion 101 for connecting the pipes to each other. The connection portion 101 shown in Fig. 7 is a flange connection, but may be a screw connection or a welded connection. The system piping 100 is supported by a plurality of pipe supports 102.
Next, a preferred position of a vibration point P for vibrating the system piping 100 when performing vibration diagnosis on the system piping 100 will be described.

FIG. 8 is an explanatory diagram showing a preferred vibration point P in the vibration diagnosis device 200 for a pump station system piping according to the first embodiment.
As shown in FIG. 8, it is preferable that the vibration points P at which the system piping 100 is vibrated include at least one of vibration points P1 to P4.

The vibration point P1 is the connection 101 between the pipes of the system piping 100. The vibration point P2 is between the connection 101 and the next adjacent connection 101. Specifically, the vibration point P2 should be located at a position of A/2, where A is the distance from the connection 101 to the next adjacent connection 101. The vibration point P1 directly vibrates the connection 101, where rust and corrosion are relatively likely to occur, making it easier to find abnormalities or signs of such problems. In addition, the vibration point P2 is located some distance away from the connection 101, making it easier to find rust and corrosion other than at the connection 101.

The excitation point P3 is the pipe support 102 that supports the system piping 100. The excitation point P4 is between the pipe support 102 and the adjacent pipe support 102. Specifically, the excitation point P4 should be at a position of B/2, where B is the distance from the pipe support 102 to the adjacent pipe support 102. At the excitation point P3, the system piping 100 is fixed by the pipe support 102, so vibration can be measured under the same conditions. In addition, since the excitation point P4 is between the pipe supports 102, the amplitude of the system piping 100 is likely to be large, making it easier to measure the sound and vibration of the system piping 100 with the measuring device 202.

Next, the operation of the vibration device 201 will be described with reference to Figures 9 and 10. Note that in the following description, the vibration device 201 is operated automatically using a timer switch, but the vibration device 201 may also be operated by an operator manually turning on the switch during regular inspection, for example.

Fig. 9 is an explanatory diagram for explaining the operation of the vibration device 201 according to the first embodiment. Fig. 10 is a flowchart for explaining the operation of the vibration device 201 according to the first embodiment.
As shown in FIG. 9( a ), the vibration device 201 includes a power supply unit 240 that supplies power to a hoisting machine 230 (electric motor 233), and a timer switch 250 (hereinafter referred to as a first timer switch 250) that cuts off the supply of power from the power supply unit 240 to the hoisting machine 230 a predetermined time after the hoisting machine 230 starts to wind up, causes the rope 220 to rewind by the weight of the weight 210, and causes the weight 210 to drop into the system piping 100.

Furthermore, the vibration device 201 of this embodiment is equipped with a second timer switch 260 that resumes the supply of power from the power supply unit 240 to the hoisting machine 230 a predetermined period after the supply of power from the power supply unit 240 to the hoisting machine 230 is cut off. The set period of the second timer switch 260 is preferably one month. The set period of the second timer switch 260 may be set according to, for example, a regular inspection period, and may be set longer or shorter than one month.

In normal operation (standby), as shown in FIG. 9(a), the vibration device 201 is in a state where the rope 220 is fully extended and the weight 210 and the system piping 100 are in contact with each other. In addition, during this normal operation, the first timer switch 250 and the second timer switch 260 are both OFF, and power supply from the power supply unit 240 to the hoisting machine 230 is cut off. The second timer switch 260 is set to turn ON after the above-mentioned predetermined period T2 (e.g., one month) in this state.

In other words, when the vibration device 201 is in normal operation, as shown in FIG. 10, the second timer switch 260 starts measuring a preset predetermined period T2 (step S1). When the predetermined period T2 has elapsed since the second timer switch 260 started measuring (step S2), the second timer switch 260 turns ON (step S20). When the second timer switch 260 turns ON, the first timer switch 250 also turns ON (step S10), the power supply unit 240 is established (step S21), and the electric motor 233 of the hoisting machine 230 starts operating (step S22).

When the electric motor 233 starts to operate, as shown in FIG. 9(b), the hoist drum 231 rotates and the rope 220 fixed to the hoist drum 231 is wound up. When the first timer switch 250 is turned ON in step S10, it starts measuring a preset hoisting time T1 (step S11). The hoisting time T1 can be set by calculating in advance the time it takes for the hoist 230 to hoist the rope 220.

When a predetermined winding time T1 has elapsed since the start of measurement by the first timer switch 250 (step S12), the first timer switch 250 turns OFF (step S13). This cuts off the power supply from the power supply unit 240 to the hoisting machine 230, and the electric motor 233 of the hoisting machine 230 stops (step S14). This causes the rope 220 to rewind due to the weight of the weight 210, causing the weight 210 to fall into the system piping 100, causing the system piping 100 to vibrate, as shown in FIG. 9(c).

When the first timer switch 250 is turned OFF, the second timer switch 260 is also turned OFF (step S23), and the second timer switch 260 starts measuring the set predetermined period T2 again (step S1). After that, the normal time shown in FIG. 9(a) is restored, and after the above-mentioned predetermined period T2 (e.g., one month) has elapsed, the second timer switch 260 is turned ON again, and the above-mentioned flow is repeated.

The measuring device 202 shown in Fig. 7 measures the vibration of the system piping 100, which is periodically vibrated. The measurement data of the measuring device 202 is transmitted to the data processing device 203 by wire or wirelessly. The data processing device 203 performs real-time analysis, FFT analysis, etc., accumulates the measurement data, and manages the trends thereof. Note that the real-time analysis, FFT analysis, etc., performed on the measuring device 202 side may be transmitted to the data processing device 203. Furthermore, the data processing device 203 may be placed not in the vicinity of the system piping 100 but in a remote monitoring room or the like.
By performing such an automatic vibration diagnosis of the system piping 100, it becomes possible to detect abnormalities and their signs in parts that were not detected before, and to manage trends, and it also becomes possible to reduce manpower.

Fig. 11 is a graph showing frequency analysis of measurement data (initial measurement data) of the measuring device 202 by the data processing device 203 according to the first embodiment. Fig. 12 is a graph showing frequency analysis of measurement data (measurement data when an abnormality occurs) of the measuring device 202 by the data processing device 203 according to the first embodiment. Figs. 11 and 12 show examples of the results of FFT analysis with frequency on the horizontal axis and sound pressure level on the vertical axis.
As shown in FIGS. 11 and 12 , the data processing device 203 performs frequency analysis on the vibration results of the system piping 100 to diagnose the system piping 100 .

As shown in Figures 11 and 12, when observing the frequency component (dominant frequency) of a certain peak surrounded by the reference symbol 300, it is clearly higher in Figure 12 than in Figure 11, and it is clear that some kind of abnormality has occurred in Figure 12. Note that since the natural frequency of the system piping 100 differs depending on each plant and each location, as shown in Figure 11, an abnormality or a sign of an abnormality in the system piping 100 is diagnosed by comparing with the initial measurement data.

When a blockage occurs in the system piping 100, a change occurs at a specific frequency, or the vibration waveform itself changes. The measurement data at the time of occurrence of the abnormality may change, for example, by increasing or decreasing the sound pressure level at one or more of the dominant frequencies of the initial measurement data shown in Fig. 11. Furthermore, the measurement data at the time of occurrence of the abnormality may change or disappear at a dominant frequency compared to the initial measurement data shown in Fig. 11.
The data processing device 203 detects abnormalities and their precursors in the system piping 100 by observing the above-mentioned changes.

As described above, the vibration diagnosis device 200 for pump station system piping according to the present embodiment is provided in a pump station 1 provided with a main pump 10 and an auxiliary machine 20 that operates the main pump 10, and includes a vibration device 201 that vibrates a specific location of the system piping 100 of the auxiliary machine 20, a measuring device 202 that measures the vibration of the system piping 100 caused by the vibration, and a data processing device 203 that diagnoses the system piping 100 based on the measurement data of the measuring device 202. With this configuration, it is possible to find abnormalities or signs of abnormalities in the system piping 100 that could not be found by merely visually checking the appearance of the auxiliary machine 20 or checking the operation of the auxiliary machine 20 in the past.

In this embodiment, the system piping 100 includes at least one of the following: a cooling water system piping 100 that supplies cooling water to the drive unit of the main pump 10; a full water system piping 100 that fills the main pump 10 with priming water; a sealing water system piping 100 that supplies sealing water liquid to the shaft seal of the main pump 10; a compressed air system piping 100 that supplies compressed air to the drive unit of the main pump 10; and a drainage system piping 100 for the pump station 1. These are system piping 100 that are prone to rust and corrosion, so this configuration makes it easier to detect abnormalities and their precursors.

In addition, in this embodiment, the vibration device 201 periodically vibrates a specific location of the system piping 100. With this configuration, for example, in a pump station 1 where managed operation is not possible, the system piping 100 can be periodically diagnosed, for example, about once a month. Also, in a pump station 1 where managed operation is possible, the system piping 100 can be periodically diagnosed by performing the diagnosis in accordance with the managed operation period.

In addition, in this embodiment, the vibration device 201 drops the weight 210 to vibrate a specific location of the system piping 100. With this configuration, a constant impact can be applied to the system piping 100, so the vibration of the system piping 100 can be measured periodically under the same conditions, and the accuracy of the vibration diagnosis can be improved compared to, for example, a case where an operator vibrates the system piping 100 with a hammer or the like.

In this embodiment, the vibration device 201 includes a rope 220 that suspends the weight 210, a hoist 230 that winds up the rope 220, a power supply unit 240 that supplies power to the hoist 230, and a first timer switch 250 that cuts off the power supply from the power supply unit 240 to the hoist 230 a predetermined time after the hoist 230 starts winding, causes the rope 220 to rewind under the weight of the weight 210, and causes the weight 210 to drop into the system piping 100. With this configuration, the weight 210 can be automatically dropped into the system piping 100 to perform vibration diagnosis.

In addition, in this embodiment, the vibration device 201 includes a second timer switch 260 that resumes the supply of power from the power supply unit 240 to the hoisting machine 230 a predetermined period after the supply of power from the power supply unit 240 to the hoisting machine 230 is cut off. With this configuration, in combination with the first timer switch 250, the weight 210 can be periodically dropped into the system piping 100 to perform vibration diagnosis.

In addition, in this embodiment, the data processing device 203 diagnoses the system piping 100 by comparing the measurement data of the measuring device 202 with the measurement data previously measured by the measuring device 202. For example, by comparing the above-mentioned initial measurement data with the data when an abnormality occurs during inspection, differences and changes from the initial measurement data can be found, and abnormalities such as clogging due to foreign matter or rust, thinning due to corrosion, and cracks can be found early, making it possible to manage trends in the system piping 100. In addition, by finding certain characteristics in each abnormal state such as clogging, thinning due to corrosion, and cracks in the system piping 100 or the analysis results at intermediate stages, and using these characteristics as teacher data, abnormalities in the system piping 100 and their precursors can be found.

In addition, in this embodiment, the vibration points P that vibrate the system piping 100 include at least one of the connection parts 101 between the pipes of the system piping 100, the area between the connection part 101 and the adjacent connection part 101, the pipe support 102 that supports the system piping 100, and the area between the pipe support 102 and the adjacent pipe support 102. In order to vibrate the same position, it is advisable to mark the vibration points P with a sticker, paint, or the like to improve the accuracy of the vibration diagnosis. Also, a vibration device 201 may be installed at each of the vibration points P1 to P4.

At excitation point P1, rust and corrosion are relatively likely to occur at the connection 101, making it easier to detect abnormalities and signs of such problems. At excitation point P2, it is somewhat distant from the connection 101, making it easier to detect rust and corrosion other than at the connection 101. At excitation point P3, the system piping 100 is fixed by the piping support 102, so vibration can be measured under the same conditions. At excitation point P4, it is between the piping supports 102, so the amplitude of the system piping 100 is large, making it easier to measure the sound and vibration of the system piping 100 with the measuring device 202.

Furthermore, by setting two or more excitation points P, it is possible to diagnose the differences in each measurement value (frequency change or attenuation) and identify the location of the abnormality. Furthermore, by capturing the trend of change in the measurement value in accordance with the change in each measurement value (change over time), more accurate diagnosis is possible. Note that by attaching the measuring device 202 to one of the excitation points P (for example, excitation point P3, which can utilize the piping support 102) and sequentially changing the excitation points P1 to P4, it is possible to identify the abnormality from the difference in response time.

In addition, in this embodiment, the specific locations of the system piping 100 include specific locations W where water constantly accumulates in the system piping 100. This configuration makes it possible to diagnose abnormalities and their precursors in the specific locations W where rust and corrosion are particularly likely to occur.

In addition, in this embodiment, the specific locations of the system piping 100 include a specific location L that is the lowest installed location in the system piping 100. This configuration makes it possible to diagnose abnormalities and their precursors in the specific location L where rust and corrosion are particularly likely to occur.

In addition, in this embodiment, the data processing device 203 performs frequency analysis of the measurement data of the measuring device 202 to diagnose the system piping 100. This is because diagnosing the system piping 100 is easier to compare when frequency analysis is performed on the vibration results of the system piping 100. Note that the frequency analysis may be performed in real time or/and FFT analysis as described above to extract differences and points of change.

Second Embodiment
Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

FIG. 13 is an explanatory diagram showing a vibration diagnosis device 200 for a pump station system piping according to the second embodiment.
13 , the vibration diagnosis device 200 of the second embodiment differs from the above-mentioned embodiments in that an arm 270 is rotated to vibrate a specific portion of the system piping 100. A weight 271 for vibrating the system piping 100 is attached to one end (tip side) of the arm 270.

Specifically, the vibration device 201 shown in FIG. 13 includes a support shaft 280 that rotatably supports the other end (base end) of the arm 270, and an actuator 281 connected to the support shaft 280. The actuator 281 is, for example, an electric motor, and lifts the arm 270 to a predetermined angle by rotating the support shaft 280. Then, as in the first embodiment described above, by stopping the electric motor with a timer switch or the like, the arm 270 falls freely, and the weight 271 describes an arc trajectory and hits the system piping 100.

According to the second embodiment, as in the first embodiment described above, a constant impact can be applied to the system piping 100, so that the vibration of the system piping 100 can be measured periodically under the same conditions, and the accuracy of the vibration diagnosis can be improved compared to, for example, a case where an operator vibrates the system piping 100 with a hammer or the like.

In addition, the following modifications can be made to the second embodiment:

FIG. 14 is an explanatory diagram showing a vibration diagnosis device 200 for a pump station system piping according to a modified example of the second embodiment.
The vibration device 201 of the vibration diagnosis device 200 shown in Figure 14 includes a support shaft 280 that supports an arm 270 so that it can rotate freely, a first weight 271 provided on one end side of the arm 270 closer to the support shaft 280, a receiving tray portion 272 provided on the other end side of the arm 270 closer to the support shaft 280, and a weight adding device 282 that adds a second weight 273 to the receiving tray portion 272.

The arm 270 shown in FIG. 14 is formed, for example, in a U-shape in cross section, and is supported by a support shaft 280 so that one end where the first weight 271 is provided is normally lowered. A partition plate 274 forming a receiving tray 272 is fixed to the inside of the arm 270 on the other end side of the arm 270 closer to the support shaft 280. The other end of the arm 270 is an open drain port 275, and when the other end side of the arm 270 is lowered, the second weight 273 accumulated in the receiving tray 272 is discharged to the drain discharge section 283.

The weight adding device 282 puts liquid such as water or solid such as sand as the second weight 273 into the receiving tray 272. If the second weight 273 is water, a valve can be provided in a pipe branched off from a water supply equipment pipe that is constantly filled with water (pressurized) or a system equipment pipe that is filled with water during operation, and water can be added to the receiving tray 272 by opening the valve. If the weight adding device 282 is automated, the valve can be an electric valve and a control can be incorporated to open the valve periodically. If the second weight 273 is a solid, the solid can be put into the receiving tray 272 by a belt conveyor or the like, but if the device is large, the solid may be added manually.

According to the vibration device 201 configured as above, as the second weight 273 is added to the receiving tray 272, at a certain timing, the second weight 273 causes the arm 270 to rotate about the support shaft 280, and one end of the arm 270 rises. When the one end of the arm 270 rises, the other end of the arm 270 descends, and the second weight 273 accumulated in the receiving tray 272 is discharged from the discharge port 275 at the other end of the arm 270. Then, the one end of the arm 270, which is relatively heavier than the other end of the arm 270, descends due to gravity, and the first weight 271 traces an arc and collides with the system piping 100.

According to this modified example of the second embodiment, as in the first embodiment described above, a constant impact can be applied to the system piping 100, so that the vibration of the system piping 100 can be measured periodically under the same conditions, and the accuracy of the vibration diagnosis can be improved compared to, for example, a case in which an operator vibrates the system piping 100 with a hammer or the like.

FIG. 15 is an explanatory diagram showing a vibration diagnosis device 200 for a pump station system piping according to a modified example of the second embodiment.
The vibration device 201 of the vibration diagnosis device 200 shown in FIG. 15 includes a spring 290 that biases the arm 270 toward the system piping 100, an actuator 281 that moves the arm 270 away from the system piping 100 and charges (contracts) the spring 290, and a power supply unit 240 that supplies power to the actuator 281.

The arm 270 is supported by the support shaft 280 at a midpoint in its longitudinal direction. The spring 290 biases one end of the arm 270 on the opposite side of the support shaft 280 to one end of the arm 270 on which the first weight 271 is provided. The spring 290 is supported by a support base 291 and biases the other end of the arm 270 so as to press the one end of the arm 270 against the system piping 100. The actuator 281 is, for example, an electric motor, and is connected to the support shaft 280. The actuator 281 may be a solenoid or the like as long as it can store (compress) the spring 290.

The vibration device 201 shown in FIG. 15 is similar to the first embodiment described above and includes a first timer switch 250 that cuts off the power supply from the power supply unit 240 to the actuator 281 a predetermined time after the actuator 281 starts to drive, rotates the arm 270 by the force of the spring 290, and causes the arm 270 to collide with the system piping 100, and a second timer switch 260 that resumes the power supply from the power supply unit 240 to the actuator 281 a predetermined time after the power supply from the power supply unit 240 to the actuator 281 is cut off.

In the normal state (standby state) of the vibration device 201, as shown in FIG. 15, the spring 290 is in an extended state, and the first weight 271 and the system piping 100 are in contact. In addition, in this normal state, the first timer switch 250 and the second timer switch 260 are both OFF, and the power supply from the power supply unit 240 to the actuator 281 is cut off. The second timer switch 260 is set to turn ON after the above-mentioned predetermined period (e.g., one month) in this state.

FIG. 16 is an explanatory diagram illustrating the operation of the vibration device 201 according to the modified example of the second embodiment.
When a predetermined period of time has elapsed since the start of measurement by the second timer switch 260, the second timer switch 260 is turned ON, and the first timer switch 250 is also turned ON, the power supply unit 240 is established, and the actuator 281 starts operating. As shown in Fig. 16(a) , the actuator 281 separates the arm 270 from the system piping 100 and stores energy in the spring 290.

When the first timer switch 250 is turned ON, the first timer switch 250 starts measuring a preset predetermined time. The predetermined time can be set by calculating in advance the time it takes for the actuator 281 to compress the spring 290 to a predetermined length. When the predetermined time has elapsed since the first timer switch 250 started measuring, the first timer switch 250 turns OFF, and the supply of power from the power supply unit 240 to the actuator 281 is cut off.

Then, the energy stored in the spring 290 is released, and as shown in FIG. 16B, the urging of the spring 290 causes the arm 270 to rotate about the support shaft 280, and the first weight 271 describes an arcuate trajectory and collides with the system piping 100.
According to this modified example of the second embodiment, a constant impact can be applied to the system piping 100 by the force of the spring 290, so that the vibration of the system piping 100 can be measured periodically under the same conditions. This makes it possible to improve the accuracy of the vibration diagnosis compared to, for example, a case where an operator vibrates the system piping 100 with a hammer or the like.

FIG. 17 is an explanatory diagram showing a vibration diagnosis device 200 for a pump station system piping according to a modified example of the second embodiment.
15 described above, the vibration device 201 of the vibration diagnosis device 200 shown in Fig. 17 is configured to strike the system piping 100 by the bias of a spring 290, but strikes the system piping 100 in an upside-down state. In the configuration in which the system piping 100 is struck by the bias of the spring 290, the position at which the system piping 100 is struck is not limited to above, as in the case of free fall, and the system piping 100 can be struck in a horizontal position or from below, for example.

Although preferred embodiments of the present invention have been described and illustrated above, it should be understood that these are illustrative of the present invention and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. Thus, the present invention should not be considered as limited by the foregoing description, but rather by the scope of the claims.

FIG. 18 is an explanatory diagram showing a vibration diagnosis device 200 for a pump station system piping according to another embodiment.
18 includes a vibration device 201 that is provided with a vibration speaker 205 that is attached to the system piping 100. The vibration diagnosis device 200 vibrates a specific portion of the system piping 100 using the vibration speaker 205, and diagnoses the system piping 100 based on the vibration result of the system piping 100 caused by the vibration. According to this configuration, a constant vibration is applied by the vibration speaker 205, so that the system piping 100 can be vibrated and diagnosed under the same conditions.

FIG. 19 is an explanatory diagram showing a vibration diagnosis device 200 for a pump station system piping according to another embodiment.
19, a vibration device 201 of a vibration diagnosis device 200 is provided at a specific location of the system piping 100 and includes a tubular portion 206 that guides the drop of a weight 210. According to this configuration, by dropping the weight 210 from a fixed height at the upper end of the tubular portion 206 in the above-described first embodiment, the way in which the weight 210 hits the system piping 100 becomes constant, and the system piping 100 can be vibrated and diagnosed under the same conditions.

In addition, for example, in the above embodiment, specific locations of the system piping 100 are exemplified as specific location W where water always accumulates in the system piping 100 and specific location L that is the lowest installed location in the system piping 100, but vibration diagnosis may also be performed on other parts such as curved pipe sections and reducer pipe sections.

For example, in a water-filled system piping 100, the system may be affected by waves traveling through the fluid, so valves installed in the system piping may be used to determine the location of the abnormality by opening and closing the valves. Since the water system piping 100 is normally filled with water, it is advisable to perform a diagnosis by closing valves in a specific section during vibration diagnosis. By making the section closed, the diagnosis can be performed without being affected by waves traveling through the internal fluid. Alternatively, instead of valves, a vibration insulator such as a rubber flex may be installed in the piping to perform a section diagnosis. This prevents vibrations from being transmitted from the surface of the system piping 100, but instead propagates from the fluid, making it easier to identify abnormalities inside the piping.

1...pump station, 2...installation floor, 2a...pit, 2b...pit cover, 4...rotating machine, 5...reduction gear, 6...underground oil tank, 7...fuel dispenser tank, 8...air tank, 9...heat exchanger, 10...main pump, 14...full water detector, 15...drive unit, 16...shaft seal, 20...auxiliary equipment, 21...vacuum pump, 21a...electric motor, 22...fuel transfer pump, 22a...electric motor, 23...air compressor, 23a...electric motor, 24...cooling water pump, 24a...electric motor, 25...sealing water pump, 25a...electric machine, 30...full water system, 30a...system piping, 31...intake valve, 32...water supply pipe, 33b...discharge pipe, 34...water tank, 35...water supply valve, 40...fuel supply piping, 50...compressed air system, 50a...system piping, 60...cooling water system, 60a...system piping, 60b...system piping, 61...cooling water tank, 62...backflow prevention valve, 63...opening/closing valve, 64...automatic air vent valve, 71...water intake pit, 72...water intake pump, 72a...electric motor, 73...strainer, 74...sand separator, 80... Water sealing system, 80a...system piping, 81...water sealing valve, 81a...branch pipe, 100...system piping, 101...connection section, 102...piping support, 200...vibration diagnostic device, 201...vibration device, 202...measuring device, 203...data processing device, 205...vibration speaker, 206...tubular section, 210...weight, 220...rope, 230...hoisting machine, 231...hoisting drum, 232...axial support section, 233...motor, 240...power supply section, 250...first timer switch (timer switch ), 260...second timer switch, 270...arm, 271...weight, 271...first weight, 272...receiving tray, 273...second weight, 274...partition plate, 275...discharge port, 280...support shaft, 281...actuator, 282...weight addition device, 283...drain discharge section, 290...spring, 291...support base, L...specific location, P...excitation point, P1...excitation point, P2...excitation point, P3...excitation point, P4...excitation point, T1...winding time, T2...predetermined period, W...specific location

Claims (17)

A vibration device that vibrates a specific portion of a system piping of the auxiliary equipment in a pump station in which a main pump and an auxiliary equipment that operates the main pump are provided;
a measuring device for measuring vibration of the system piping caused by the excitation;
a data processing device that diagnoses abnormal locations inside the system piping based on measurement data from the measuring device. 2. The vibration diagnostic device for pump station system piping according to claim 1, wherein the specific location of the system piping includes a location in the system piping where water always accumulates or where water is likely to accumulate. The system piping includes:
A system piping of a cooling water system for supplying cooling water to a drive device of the main pump;
A system piping for a water-filling system for filling the main pump with priming water;
A system piping for a seal water system that supplies seal water liquid to a shaft seal portion of the main pump;
A system piping for a compressed air system that supplies compressed air to the drive device of the main pump;
3. The vibration diagnosis device for pump station system piping according to claim 1 or 2 , wherein at least one of the system piping of a drainage system of the pump station is included. 4. The vibration diagnosis device for a pump station system piping according to claim 1 , wherein the vibration device periodically vibrates a specific portion of the system piping. 5. The vibration diagnosis device for a pump station system piping according to claim 1, wherein the vibration device vibrates a specific portion of the system piping by dropping a weight. The vibration device is
A rope for suspending the weight;
A winch that winds up the rope;
A power supply unit that supplies power to the hoist;
6. The vibration diagnosis device for pump station system piping according to claim 5, further comprising a timer switch that cuts off the supply of power from the power supply unit to the hoist after a predetermined time has elapsed since the hoist started to hoist, causes the rope to be rewound by the weight of the weight, and causes the weight to fall into the system piping. The vibration diagnosis device for pump station system piping as described in claim 6, characterized in that the vibration device is provided with a second timer switch that resumes the supply of power from the power supply unit to the hoisting machine a predetermined period of time after the supply of power from the power supply unit to the hoisting machine is cut off. A vibration diagnosis device for a pump station system piping as described in any one of claims 5 to 7 , characterized in that the vibration device is provided at a specific location of the system piping and has a cylindrical portion that guides the fall of the weight. 5. The vibration diagnosis device for a pump station system piping according to claim 1, wherein the vibration device rotates an arm to vibrate a specific portion of the system piping. The vibration device is
A support shaft that rotatably supports the arm;
a first weight provided on one end side of the arm relative to the support shaft;
a receiving tray portion provided on the other end side of the arm relative to the support shaft;
a weight adding device for adding a second weight to the tray portion,
10. The vibration diagnosis device for pump station system piping as described in claim 9, characterized in that the tray portion is provided with an outlet for discharging the second weight when the arm rotates around the support shaft by the second weight and one end side of the arm is lower than the other end side. The vibration device is
a spring that biases the arm toward the system piping;
an actuator that separates the arm from the system piping and stores the spring;
A power supply unit that supplies power to the actuator;
10. The vibration diagnosis device for pump station system piping as claimed in claim 9, further comprising a timer switch that cuts off the supply of power from the power supply unit to the actuator a predetermined time after the actuator starts to be driven, rotates the arm by the force of the spring, and causes the arm to collide with the system piping. The vibration diagnosis device for pump station system piping as described in claim 11, characterized in that the vibration device is provided with a second timer switch that resumes the supply of power from the power supply unit to the actuator a predetermined period after the supply of power from the power supply unit to the actuator is cut off. The vibration diagnosis device for pump station system piping according to any one of claims 1 to 12 , characterized in that the data processing device diagnoses the system piping by comparing the measurement data of the measuring device with measurement data measured in the past by the measuring device. The vibration points for vibrating the system piping include:
A connection portion between the pipes of the system piping;
Between the connection portion and the adjacent connection portion,
A piping support for supporting the system piping;
The vibration diagnostic device for pump station system piping according to any one of claims 1 to 13 , characterized in that at least one of the following is included: between the piping support and an adjacent piping support. The pump station system piping vibration diagnosis device according to any one of claims 1 to 14, characterized in that the data processing device performs frequency analysis on the measurement data of the measurement device to diagnose the system piping. A vibration device that vibrates a specific portion of a system piping of the auxiliary equipment in a pump station in which a main pump and an auxiliary equipment that operates the main pump are provided;
a measuring device for measuring vibration of the system piping caused by the excitation;
a data processing device that diagnoses the system piping based on the measurement data of the measurement device,
The vibration diagnosis device for pump station system piping, wherein the vibration excitation device drops a weight to vibrate a specific portion of the system piping. A vibration device that vibrates a specific portion of a system piping of the auxiliary equipment in a pump station in which a main pump and an auxiliary equipment that operates the main pump are provided;
a measuring device for measuring vibration of the system piping caused by the excitation;
a data processing device that diagnoses the system piping based on the measurement data of the measurement device,
The vibration device rotates an arm to vibrate a specific portion of the system piping,
A support shaft that rotatably supports the arm;
a first weight provided on one end side of the arm relative to the support shaft;
a receiving tray portion provided on the other end side of the arm relative to the support shaft;
a weight adding device for adding a second weight to the tray portion,
the receiving tray portion is provided with an outlet for discharging the second weight when the arm rotates around the support shaft by the second weight and one end side of the arm is lower than the other end side.

Images