JP2008031906A - Controlled operation method for vertical shaft pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controlled operation method for a vertical shaft pump 14 capable of executing controlled operation if water level A in a suction water tank 10 is over a lower end level B of a suction bellmouth 22. <P>SOLUTION: This invention relates to a controlled operation method for the vertical shaft pump 14 having a pumping pipe 18, a pump casing 20 and the suction bellmouth 22 connected to an upstream side of a discharge elbow 16 in order and hung down from the suction water tank 10, and provided with a discharge valve 24 in a down stream side of the discharge elbow 16. A vacuum suction means comprising a full water detector 50, a suction valve 54 and a vacuum pump 56 is connected to a suction hole 48 bored at a roughly highest part of a piping between the discharge valve 24 to a suction bellmouth 22, the discharge valve 24 is fully closed and an inside of piping is made full by vacuum suction of the inside of the piping by a vacuum suction means under a condition that water level A of the suction water tank 10 is at a lower end level B of the suction bellmouth 22 or higher, and the vertical shaft pump 14 is started and operated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is such that the water level of the suction water tank in which the vertical shaft pump is installed is normally low and cannot be sucked, and the water level of the suction water tank is at the lower end level of the suction bell mouth in a pumping station where the pump cannot be started. The present invention relates to a management operation method for a vertical shaft pump that can perform a management operation.

  A vertical shaft pump will be installed at the drainage station in order to allow quick drainage in response to sudden water discharge. An example of a conventional vertical shaft pump installation structure will be described with reference to FIG. FIG. 5 is a longitudinal sectional view of an example of a conventional vertical shaft pump installation structure.

In FIG. 5, a discharge elbow 16 of a vertical shaft pump 14 is installed and fixed on a first floor 12 disposed above the suction water tank 10, and a pump pipe 18, a pump casing 20, and a suction pipe are disposed upstream of the discharge elbow 16. The bell mouths 22 are sequentially connected and suspended. Further, the discharge valve 24 and the discharge pipe 26 are sequentially connected to the downstream side of the discharge elbow 16, and the discharge pipe 26 is opened to the discharge water tank 28. Then, the pump shaft 30 protrudes through the upper outer wall of the discharge elbow 16, and the pump shaft 30 is driven by a speed reducer 34 installed on the second floor 32 disposed above the first floor 12. Connected. Further, the speed reducer 34 is connected to a driving device 38 disposed on the second floor 32 via a detachable clutch 36. In such a configuration, when drainage is required at the time of flooding, the drive device 38 is activated to perform the pumping operation of the vertical shaft pump 14, and drainage is performed from the suction water tank 10 to the discharge water tank 28. The structure of the vertical shaft pump 14 is known in Japanese Patent Application Laid-Open No. 7-145793.
JP-A-7-145793

  It is important that the vertical shaft pump 14 can be reliably operated in an emergency situation in which drainage is urgently required such as when water is discharged. Therefore, in order to confirm that the operation can be normally performed, a management operation of the vertical shaft pump 14 is periodically performed. In order to perform this management operation, the water level of the suction water tank 10 needs to be high enough to allow the pump impeller to be immersed in water so that the vertical shaft pump 14 can suck up water. For this reason, normally, when the water level of the suction water tank 10 does not reach the height required for operation, the management operation is performed after the gate is closed and water is stored in the suction water tank 10 to secure the required water level. Moreover, when the water level of the suction water tank 10 cannot be obtained to a necessary height, the detachable clutch 36 was disconnected and only the driving device 38 was operated. The reduction gear 34 and the vertical shaft pump 14 cannot be operated.

  In the management operation of the conventional vertical shaft pump 14, it is necessary to raise the water level of the suction water tank 10 to such an extent that the pump impeller is immersed in the water. There was a bug to do. Furthermore, if the water level of the suction water tank 10 cannot be obtained to the required height, the reduction gear 34 and the vertical shaft pump 14 could not be operated, and sufficient reliability could not be ensured.

  The present invention has been made in view of the circumstances of the prior art, and an object of the present invention is to provide a management operation method for a vertical shaft pump that can perform a management operation as long as the water level in the suction water tank reaches the lower end level of the suction bell mouth.

  In order to achieve this object, the present invention connects a pumping pipe, a pump casing, and a suction bell mouth in order to the upstream side of the discharge elbow and hangs down the suction water tank, and provides a discharge valve on the downstream side of the discharge elbow. A vertical operation pump management operation method, wherein a vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with a substantially uppermost part of the pipe line between the discharge valve and the suction bell mouth, and the water level of the suction water tank In the state where the suction bell mouth is at or above the lower end level of the suction bell mouth, the discharge valve is fully closed, the inside of the pipeline is filled with the vacuum suction means, and the vertical pump is started and operated. .

  A vertical shaft provided by sequentially connecting a pumping pipe, a pump casing and a suction bell mouth to the upstream side of the discharge elbow and depending on the suction water tank, and sequentially connecting a cooling device and a discharge valve to the downstream side of the discharge elbow. A pump management operation method, wherein a vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with a substantially uppermost part of a pipe line between the discharge valve and the suction bell mouth, and the cooling device for the pipe line A return pipe for returning a part of the water in the pipe line to the suction water tank from between the discharge valve and the discharge valve, a shut-off valve is provided in the return pipe, and the water level of the suction water tank is the lower end of the suction bell mouth The discharge valve and the closing valve are fully closed in a state at or above the level, and the inside of the pipe line is filled with the vacuum suction means, and the vertical pump is started and operated, Occlusion The cooling device may be operated by the return piping part of water in the conduit is returned to the suction water tank opened.

  In addition, a pumping pipe, a pump casing, and a suction bell mouth are sequentially connected to the upstream side of the discharge elbow and suspended from the suction water tank, and a cooling device and a discharge valve are sequentially connected to the downstream side of the discharge elbow. A vertical pump management operation method, wherein a vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with a substantially uppermost part of the pipe line between the discharge valve and the suction bell mouth, and the cooling of the pipe line A return pipe for returning a part of the water in the pipe line is provided in the suction water tank from between the device and the discharge valve, a check valve is provided in the return pipe, and the water level of the suction water tank is the suction bell mouth The discharge valve is fully closed while the lower end level is at or above the lower end level, the inside of the pipeline is filled with the vacuum suction means, the vertical shaft pump is started and operated, and the check Before through the valve It is also possible by the return pipe returning the portion of water in the conduit to the suction water tank so that the cooling device is operated.

  Further, a pumping pipe, a pump casing, and a suction bell mouth are sequentially connected to the upstream side of the discharge elbow and suspended from the suction water tank, and a cooling device and a discharge valve are sequentially connected to the downstream side of the discharge elbow. A vertical pump management operation method, wherein a vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with a substantially uppermost part of the pipe line between the discharge valve and the suction bell mouth, and the cooling of the pipe line A return pipe for returning a part of the water in the pipe line to the suction water tank from between the apparatus and the discharge valve is provided, and the free end of the return pipe is below the lower end level of the suction bell mouth in the suction water tank In the state where the water level of the suction water tank is at or above the lower end level of the suction bell mouth, the discharge valve is fully closed and the inside of the pipe line is filled with the vacuum suction means As Thereby operated to start the elevation shaft pump, it is also possible to the cooling device operates a part of water in the conduit by the return pipe is returned to the suction tank.

  Further, the vacuum suction means may communicate with a vacuum pump via a full water detector for detecting full water in the pipe line and an on-off valve.

  And you may arrange | position the flow regulating valve in the said return piping.

  In the management operation method of the vertical shaft pump according to claim 1, if the water level of the suction water tank reaches the lower end level of the suction bell mouth, water is sucked up by the vacuum suction means, and the pipe line between the discharge valve and the suction bell mouth It is possible to start up and operate the vertical shaft pump with the inside full. Therefore, it is possible to operate at a water level that is considerably lower than the water level of the suction water tank required for conventional management operation, and less labor and time are required to perform regularly than in the past. And sufficient reliability can be ensured by operating the vertical shaft pump itself.

  And in the management operation method of the vertical shaft pump according to claims 2 to 4, water in the cooling device is obtained by returning a part of the water in the pipe line to the suction water tank through the return pipe during the management operation. Can pass through and operate well as a cooling device. Therefore, it is possible to cool the speed reducer, the drive device, and the like by the operation of this cooling device.

  In the operation method of the vertical shaft pump according to claim 5, since the vacuum suction means communicates with the vacuum pump through the full water detector and the on-off valve, there is a risk that water may enter the vacuum pump and be damaged. In addition, the operation of filling the pipe line between the discharge valve and the suction bell mouth is easy.

  In the operation method of the vertical shaft pump according to claim 6, since the flow rate adjusting valve is provided in the return pipe, the flow rate of water pumped by the vertical shaft pump is appropriately set so that suction vortex does not occur in the suction water tank. I can do it.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a longitudinal sectional view of a first embodiment of a vertical pump for carrying out the vertical pump management operation method of the present invention. In FIG. 1, the same or equivalent members as in FIG.

  In the vertical shaft pump 14 of the first embodiment shown in FIG. 1, the discharge elbow 16 of the vertical shaft pump 14 is installed and fixed on the first floor 12 disposed above the suction water tank 10, and the upstream side of the discharge elbow 16 The pump pipe 18, the pump casing 20 and the suction bell mouth 22 are sequentially connected and suspended. Further, the loose flange 40, the discharge valve 24, and the discharge pipe 26 are sequentially connected to the downstream side of the discharge elbow 16, and the discharge pipe 26 is opened to communicate with a discharge water tank (not shown). Then, the pump shaft 30 protrudes through the upper outer wall of the discharge elbow 16, and the pump shaft 30 is drivingly connected to a reduction gear (not shown) via shaft couplings 42 and 44. A pump impeller 46 is disposed at the lower end of the pump shaft 30 and rotates integrally with the pump shaft 30. Further, an intake hole 48 is formed at substantially the uppermost portion of the discharge elbow 16, one end side of the full water detector 50 communicates with the intake hole 48, and the other end side of the full water detector 50 communicates with the intake pipe 52. This intake pipe 52 is branched into two, one communicates with the vacuum pump 56 via the intake valve 54, and the other communicates with the atmosphere via the vacuum break valve 58. Then, a signal of full water detection by the full water detector 50 is given to the control device 60, and the intake valve 54, the vacuum pump 56 and the vacuum breaker valve 58 are controlled by the signal from the control device 60. The full water detector 50, the intake pipe 52, the intake valve 54, the vacuum pump 56, and the control device 60 constitute a vacuum suction means.

  With the vertical shaft pump 14 configured as described above, when the water level A of the suction water tank 10 is equal to or higher than the lower end level B of the suction bell mouth 22 during the management operation, the discharge valve 24 is first fully closed. In response to the signal, the intake valve 54 is opened and the vacuum breaker valve 58 is closed, and the vacuum pump 56 is operated. Then, the inside of the pipe line from the discharge valve 24 to the suction bell mouth 22 becomes negative pressure, and the water in the suction water tank 10 is sucked into the pipe line from the lower end of the suction bell mouth 22 and eventually reaches the discharge valve 24. The interior is completely filled with water, and a signal indicating full water is output from the full water detector 50. Then, the control device 60 closes the intake valve 58 and stops the vacuum pump 56. In this state, a driving device (not shown) is activated, a detachable clutch is connected, rotational power is transmitted to the pump shaft 30 via the reduction gear, and the vertical shaft pump 14 is operated. Since the operation is performed in a state where the discharge valve 24 is closed, the vertical shaft pump 14 does not pump water, and water is not further sucked from the lower end of the suction bell mouth 22. Therefore, no suction vortex is generated in the suction water tank 10, and no vibration or noise is generated due to the suction vortex. Then, for example, after operating the vertical pump 14 for an appropriate time of 5 to 10 minutes, the operation of the driving device is stopped to stop the operation of the vertical pump 14. After the operation of the vertical pump 14 is stopped, the vacuum breaker valve 58 is opened by a signal from the control device 60, and the water in the pipe is dropped into the suction water tank 10, and the management operation of the vertical pump 14 is completed.

  In the management operation method of the vertical shaft pump 14 of the first embodiment, the water level A of the suction water tank 10 only needs to be at the lower end level B of the suction bell mouth 22 or above, and as in the conventional case, the pump impeller It does not require a high water level until 46 is immersed in water. That much saves the time and effort required for controlled operation. In addition, although the management operation method of the vertical shaft pump of the present invention can be sufficiently applied even when the water level A of the suction water tank 10 is a high water level such that the pump impeller 46 is immersed in water, the lower end level B of the suction bell mouth 22 can be applied. From the above, it is particularly effective at a water level that is below the inlet level C of the pump impeller 46 where the pump impeller 46 cannot suck up water.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a longitudinal sectional view of a second embodiment of the vertical pump for carrying out the management operation method of the vertical pump according to the present invention. In FIG. 2, the same or equivalent members as in FIG.

  The vertical pump 14 of the second embodiment shown in FIG. 2 is different from the first embodiment shown in FIG. 1 in the following points. First, a cooling device 62 is interposed between the loose flange 40 provided on the discharge elbow 16 and the discharge valve 24. Then, one end of the return pipe 64 is communicated with the pipeline of the cooling device 62 and the discharge valve 24 and the other end is opened to the suction water tank 10. An opening / closing valve 66 and a flow rate adjusting valve 68 are interposed in the return pipe 64. The on-off valve 66 is controlled to open and close by a signal from the control device 60.

  In the vertical pump 14 of the second embodiment having such a configuration, during the management operation, as in the first embodiment, the water level A of the suction water tank 10 is equal to or higher than the lower end level B of the suction bell mouth 22, The discharge valve 24 is fully closed, the intake valve 54 is opened by a signal from the controller 60, the vacuum breaker valve 58 and the on-off valve 66 are closed, and the vacuum pump 56 is operated. Then, the entire pipeline from the discharge valve 24 to the suction bell mouth 22 is filled with water, and a signal indicating that the water is full is output from the full water detector 50. Then, the control device 60 closes the intake valve 58, stops the vacuum pump 56, and opens the on-off valve 66. In such a state, a drive device (not shown) is activated to operate the vertical shaft pump 14. Then, since the discharge valve 24 is operated in a closed state, the vertical shaft pump 14 is pumped by the amount of water returned to the suction water tank 10 by the return pipe 64, and a part of the water in the pipe passes through the cooling device 62. It can pass through and operate as a cooling device 62. In the cooling device 62, a cooling pipe (not shown) is arranged in a coil shape along the inner peripheral surface, and heat is exchanged between the refrigerant in the cooling pipe and the water flowing in the pipe. The flow rate of water flowing in the cooling device 62 is appropriately set by adjusting the pipe thickness of the return pipe 64 and the flow rate adjustment valve 68, but is set to a flow rate that does not cause suction vortex in the suction water tank 10. .

  In the management operation method of the vertical shaft pump 14 of the second embodiment, the cooling device 62 can be operated, so that the drive device, the speed reducer and the like during the management operation can be cooled.

  Furthermore, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a longitudinal sectional view of a third embodiment of the vertical pump for implementing the vertical pump management operation method of the present invention. In FIG. 3, the same or equivalent members as those in FIGS. 1 and 2 are denoted by the same reference numerals and redundant description is omitted.

  In the vertical shaft pump 14 of the third embodiment shown in FIG. 3, the difference from the second embodiment shown in FIG. 2 is that the return pipe 64 is opened to the suction water tank 10 through the flow rate adjustment valve 68 and the check valve 70. That is.

  In the vertical pump 14 of the third embodiment having such a configuration, during the management operation, the water level A of the suction water tank 10 is in a state where the water level A of the suction bell mouth 22 is equal to or higher than the lower end level B, as in the first and second embodiments. First, the discharge valve 24 is fully closed, the intake valve 54 is opened and the vacuum breaker valve 58 is closed by a signal from the control device 60, and the vacuum pump 56 is operated. Here, the check valve 70 prevents air from flowing into the return pipe 64. Then, the entire pipeline from the discharge valve 24 to the suction bell mouth 22 is filled with water, and a signal indicating that the water is full is output from the full water detector 50. Then, the control device 60 closes the intake valve 58 and stops the vacuum pump 56. In such a state, a drive device (not shown) is activated to operate the vertical shaft pump 14. Then, since the discharge valve 24 is operated in a closed state, the vertical shaft pump 14 is pumped by the return pipe 64 through the check valve 70 by the amount of water returned to the suction water tank 10, and a part of the water in the pipe May pass through the cooling device 62 and operate as the cooling device 62.

  In the management operation method of the vertical shaft pump 14 of the third embodiment, the on-off valve 66 required in the second embodiment is not provided in the return pipe 64, and the control device 60 is more than that of the second embodiment. The control by is easier.

  A fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a longitudinal sectional view of a fourth embodiment of the vertical pump for carrying out the management operation method of the vertical pump according to the present invention. In FIG. 4, the same or equivalent members as in FIGS.

  In the vertical pump 14 of the fourth embodiment shown in FIG. 4, the difference from the second embodiment shown in FIG. 2 is that the return pipe 64 is connected to the suction bell mouth of the suction tank 10 through the flow rate adjusting valve 68. 22 is opened below the lower end level B.

  In the vertical pump 14 of the fourth embodiment having such a configuration, during the management operation, the water level A of the suction water tank 10 is in a state where the water level A of the suction bell mouth 22 is equal to or higher than the lower end level B, as in the first to third embodiments. First, the discharge valve 24 is fully closed, the intake valve 54 is opened and the vacuum breaker valve 58 is closed by a signal from the control device 60, and the vacuum pump 56 is operated. Here, since the free end of the return pipe 64 is opened below the lower end level B of the suction bell mouth 22 of the suction water tank 10, even if the water in the suction water tank 10 may be sucked up, There is no inflow of air. Then, the entire pipeline from the discharge valve 24 to the suction bell mouth 22 is filled with water, and a signal indicating that the water is full is output from the full water detector 50. Then, the control device 60 closes the intake valve 58 and stops the vacuum pump 56. In such a state, a drive device (not shown) is activated to operate the vertical shaft pump 14. Then, since the discharge valve 24 is operated in a closed state, the vertical shaft pump 14 is pumped by the amount of water that returns to the suction water tank 10 through the return pipe 64, and a part of the water in the pipe is cooled by the cooling device 62. It can pass through and operate as a cooling device 62.

  In the management operation method of the vertical shaft pump 14 according to the fourth embodiment, the free end of the return pipe 64 is opened below the lower end level B of the suction bell mouth 22 of the suction water tank 10, so that the configuration of a simple pipe is achieved. Thus, the inside of the pipe line from the discharge valve 24 to the suction bell mouth 22 can be more reliably filled with the vacuum suction means.

  In the above embodiment, the vacuum suction means is provided with the full water detector 50. However, if the vacuum pump 56 is not damaged even if water enters, the full water detector 50 is not necessarily required. Absent. In addition, although the intake hole 48 is formed at the uppermost portion of the discharge elbow 16, the position where the intake hole 48 is formed is not limited to this, and a pipe line extending from the discharge elbow 16 to the discharge valve 24. It should be almost at the top.

It is a longitudinal cross-sectional view of 1st Example of the vertical shaft for implementing the management driving | operation method of the vertical pump of this invention. It is a longitudinal cross-sectional view of 2nd Example of the vertical pump for implementing the management driving | operation method of the vertical pump of this invention. It is a longitudinal cross-sectional view of 3rd Example of a vertical pump for implementing the management driving | operation method of the vertical pump of this invention. It is a longitudinal cross-sectional view of 4th Example of the vertical pump for implementing the management driving | operation method of the vertical pump of this invention. It is a longitudinal cross-sectional view of an example of the structure of the installation of the conventional vertical shaft pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Suction tank 14 Vertical shaft pump 16 Discharge elbow 18 Pumping pipe 20 Pump casing 22 Suction bell mouth 24 Discharge valve 46 Pump impeller 48 Intake hole 50 Full detector 52 Intake pipe 54 Intake valve 56 Vacuum pump 58 Vacuum break valve 60 Control device 62 Cooling device 64 Return pipe 66 Open / close valve 68 Flow rate adjustment valve 70 Check valve

Claims (6)

A management operation method for a vertical pump in which a pumping pipe, a pump casing, and a suction bell mouth are sequentially connected to an upstream side of a discharge elbow and suspended in a suction water tank, and a discharge valve is provided on a downstream side of the discharge elbow. A vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with the uppermost part of the pipe line between the discharge valve and the suction bell mouth, and the water level of the suction water tank is at the lower end level of the suction bell mouth or above it. In this state, the discharge valve is fully closed and the inside of the pipe line is filled with the vacuum suction means, and the vertical pump is started and operated. A vertical shaft pump provided by connecting a pumping pipe, a pump casing and a suction bell mouth in order to the upstream side of the discharge elbow and depending on the suction water tank, and connecting a cooling device and a discharge valve in order to the downstream side of the discharge elbow. In the management operation method, a vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with a substantially uppermost part of the pipe line from the discharge valve to the suction bell mouth, and the cooling device for the pipe line and the A return pipe for returning a part of the water in the pipe line to the suction water tank from between the discharge valves is provided, a blocking valve is provided in the return pipe, and the water level of the suction water tank is a lower end level of the suction bell mouth or The discharge valve and the shut-off valve are fully closed in a state above that, and the inside of the pipeline is filled with the vacuum suction means, and the vertical shaft pump is started and operated, and the shut-off valve Open The return management method of operating a vertical shaft pump, wherein a portion of the water of the conduit and to the cooling device is operated to return to the suction water tank by a pipe. A vertical shaft pump provided by connecting a pumping pipe, a pump casing and a suction bell mouth in order to the upstream side of the discharge elbow and depending on the suction water tank, and connecting a cooling device and a discharge valve in order to the downstream side of the discharge elbow. In the management operation method, a vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with a substantially uppermost part of the pipe line from the discharge valve to the suction bell mouth, and the cooling device for the pipe line and the A return pipe for returning a part of the water in the pipeline to the suction water tank from between the discharge valves is provided, a check valve is provided in the return pipe, and the water level of the suction water tank is the lower end level of the suction bell mouth. Or in a state above that, the discharge valve is fully closed and the inside of the pipe line is filled with the vacuum suction means, the vertical shaft pump is started and operated, and the check valve is To the return pipe Administration method of operating a vertical shaft pump, characterized in that as the cooling device is operated to return a part of the water of the conduit to the suction aquarium Ri. A vertical shaft pump provided by connecting a pumping pipe, a pump casing and a suction bell mouth in order to the upstream side of the discharge elbow and depending on the suction water tank, and connecting a cooling device and a discharge valve in order to the downstream side of the discharge elbow. In the management operation method, a vacuum suction means for vacuum-suctioning the inside of the pipe line is communicated with a substantially uppermost part of the pipe line from the discharge valve to the suction bell mouth, and the cooling device for the pipe line and the A return pipe for returning a part of the water in the pipe line to the suction water tank from between the discharge valves is provided, and the free end of the return pipe opens below the lower end level of the suction bell mouth in the suction water tank. In the state where the water level of the suction water tank is at or above the lower end level of the suction bell mouth, the discharge valve is fully closed and the inside of the pipe line is filled with the vacuum suction means, Vertical shaft With driving Start, the return management method of operating a vertical shaft pump, wherein a portion of the water of the conduit and to the cooling device is operated to return to the suction water tank by a pipe. 5. The vertical pump management operation method according to claim 1, wherein the vacuum suction means communicates with the vacuum pump via a full water detector for detecting full water in the pipe and an on-off valve. Management operation method of the vertical shaft pump. The vertical operation management method for a vertical pump according to any one of claims 2 to 4, wherein a flow rate adjusting valve is provided in the return pipe.