JP4910758B2 - Vertical shaft pump and operation method thereof - Google Patents

Description

  The present invention relates to a vertical shaft pump and an operation method thereof, and is particularly suitable for a vertical shaft pump installed in a pump station and an operation method thereof.

  A conventional vertical axis pump is disclosed in Japanese Patent Application Laid-Open No. 11-159491 (Patent Document 1). This vertical axis pump has a rotating body part composed of an impeller and a pump shaft, a pump shaft protection tube, a rotating body support part composed of a bearing and a bearing bracket, etc., and a casing liner, a guide vane casing, and a discharge diffuser. The pull-out part is configured by combining them together. This pull-out portion is separated from the cylindrical discharge casing (outer cylinder) and has a structure that can be pulled upward. The discharge casing is supported on the upper wall (pump installation floor) of a water absorption tank (suction water tank) by a base and a support provided at a necessary place on the circumference. A suction casing and a suction bell mouth are attached to the lower end of the discharge casing. In addition, a rectifying plate arranged radially is provided between the lower surface of the suction bell mouth and the bottom surface of the water absorption tank, and the pump load is supported by the bottom surface of the strong water absorption tank and flows into the pump suction casing. Rectified.

Japanese Patent Laid-Open No. 11-159491

  With the progress of urbanization in recent years, the rainwater impervious area is increasing more and more, and the amount of rainwater inflow to the drainage pump station is increasing rapidly. For this reason, it is desired to increase the capacity and improve the functions of the pumps in the existing pump station, and in order to respond to these, the pumps in the existing pump station are being updated.

  In many cases, the renewal accompanied by the pump capacity increase involves the following problems. The first is that the capacity of the renewal pump becomes larger than that of the existing pump by increasing the capacity of the pump, and the load capacity of the pump installation floor surface of the machine may be insufficient. Secondly, the pump capacity is increased, so that the flow velocity of the bell mouth hitting the suction water tank and the pump inlet is increased, and accordingly, a harmful vortex is easily generated in the pump. In order to prevent this vortex generation, it is necessary to install a vortex prevention device near the bottom of the suction water tank or in the vicinity of the pump.

  In the above-described vertical axis pump of Patent Document 1, a rectifying plate is provided between the bottom surface of the suction bell mouth and the bottom surface of the water tank, and the pump load is supported by the bottom surface of the strong water tank and flows into the pump suction casing. Since the flow to be rectified is used, it can be used for renewal accompanying an increase in pump capacity.

  However, in the case of renewing the pump at the existing pump station, there is water in the water absorption tank unlike the new pump station. For this reason, in order to fix the baffle plate in the vertical axis | shaft pump of patent document 1 to the water absorption tank, it was necessary to exclude the whole water in a water absorption tank, and the extensive large-scale drainage operation was needed. For example, if the water tank is partitioned as a single water channel, it is necessary to eliminate the water as if the water tank was stopped by a water stop device such as a corner drop provided on the upstream side. However, when the water tanks are shared, it is necessary to stop the operation of the shared pumps and perform the same work, both of which require a large drainage work with a wide drainage range.

  An object of the present invention is to provide a vertical axis pump that can be installed without draining the entire water in the suction tank of the pump station without causing a shortage of the floor load capacity of the pump installation floor even if the pump capacity is increased. There is to do.

  The first aspect of the present invention for achieving the above-mentioned object is as follows. An outer cylinder disposed in the suction water tank through a pump insertion hole provided in the pump installation floor, a pump main body disposed in the outer cylinder, In the vertical shaft pump installed in the pump station, the lower end portion of the outer cylinder is placed on the bottom surface of the water tank in the suction water tank, provided from the bottom surface of the water tank over the height of the suction maximum water level, The upper end is attached to the pump installation floor.

A more preferable specific configuration example in the first aspect of the present invention is as follows.
(1) A lower end portion of the outer cylinder is placed in a watertight manner on the bottom surface of the water tank, a suction opening is provided at a lower portion of the outer cylinder, and a gate for opening and closing the suction opening is provided.
(2) The eddy current prevention device attached to the bottom surface of the water tank in the outer cylinder in a state where the suction opening is closed by the gate and water in the outer cylinder is excluded.
(3) A pressure jetting means for jetting pressure water from a jet outlet at the lower end of the outer cylinder to remove mud, dust and the like accumulated on the bottom of the water tank is provided.
(4) A flexible sealing ring that maintains watertightness between the lower end of the outer cylinder and the bottom of the water tank is attached to the lower end of the outer cylinder.
(5) A flange provided on the inner periphery of the lower end of the outer cylinder on the concrete solidified on the bottom surface of the water tank in the outer cylinder in a state where the suction opening is closed with the gate and water in the outer cylinder is excluded. The part was fixed and supported.
(6) The outer cylinder provided with the eddy current preventing device on the outer wall surface is disposed in the suction water tank through the pump insertion hole.
(7) The pump body is attached so that it can be pulled out from the outer cylinder, and the gap between the outer periphery of the lower end of the bell mouth of the pump body and the inner peripheral surface of the outer cylinder is made minute.
(8) The pump body has a pull-out structure.
(9) The vertical shaft pump is installed in an existing pump station, and the pump body is detachably supported on the outer cylinder.

  Moreover, the 2nd aspect of this invention is provided with the outer cylinder arrange | positioned in a suction water tank through the pump penetration hole provided in the pump installation floor, and the pump main body arrange | positioned in the said outer cylinder, The said outer cylinder The lower end of the outer cylinder is placed in a watertight manner on the bottom of the water tank, the upper end of the outer cylinder is at a height higher than the maximum suction water level of the suction water tank, a suction opening is provided at the lower part of the outer cylinder, and the suction opening is opened and closed When the vertical pump is operated, the gate is opened and closed. When the vertical pump is stopped for a long time, the gate is closed and the inside of the outer cylinder is air, low corrosive liquid, corrosion. There is a method of operating a vertical pump that is filled with an anticorrosive fluid such as an inhibitor solution.

  According to the vertical shaft pump and the operation method of the present invention, the entire water in the suction tank of the pump station can be drained without causing a shortage of the load capacity of the floor of the pump installation floor even if the pump capacity is increased. It can be installed without.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. In addition, this invention includes making it more effective by combining each embodiment suitably as needed.
(First embodiment)
A vertical axis pump according to a first embodiment of the present invention will be described with reference to FIGS. 1 is a diagram showing a state in which the vertical axis pump 50 according to the first embodiment of the present invention is installed, FIG. 2 is a diagram showing a state in the middle of installation of the vertical axis pump 50 in FIG. 1, and FIG. 3 is an enlarged view of a lower part of an outer cylinder of a pump 50. FIG. The vertical pump 50 of this embodiment is installed in an existing pump station, and specifically, is an example of a vertical diagonal flow pump for an urban drainage station.

  As shown in FIG. 1, the vertical shaft pump 50 includes an outer cylinder 1 disposed in the suction water tank 3 through the pump insertion hole 11 of the pump installation floor 10, a pump body 2 disposed in the outer cylinder 1, An eddy current preventing device 19 attached to the water tank bottom surface 4 in the cylinder 1 is provided as a main component.

  The outer cylinder 1 is composed of a vertically long cylindrical member. The outer cylinder 1 has a lower end portion 1a mounted on a water tank bottom surface 4 in a watertight manner, is provided from the water tank bottom surface 4 to a height higher than a suction maximum water level, and an upper end portion 1b formed by a flange is a base 5 of a pump installation floor 10 Mounted on top.

  A plurality of suction openings 6 are provided in the lower part of the outer cylinder 1 over the entire circumference. This suction opening 6 serves as an inlet for water during pump operation. The lower part of the outer cylinder 1 in which the suction opening 6 is formed is formed thick. When the load of the pump main body 2 is shared by the bottom of the water tank via the outer cylinder 1, the pump main body compensates for the decrease in strength due to the provision of the suction opening 6 by the thick part formed at the lower part of the outer cylinder 1. The load of 2 can be shared reliably.

  The pump body 2 is disposed in the outer cylinder 1 so as to extend upward from immediately above the suction opening 6, and further protrudes upward from the outer cylinder 1. A flange portion 2 a is attached to the outer periphery of the upper portion of the pump body 2. The flange portion 2a is mounted on the upper end flange portion 1a of the outer cylinder 1 and is detachably attached.

  With such a configuration, the load of the outer cylinder 1 and the pump main body 2 is also shared by the water tank bottom surface 4, and the load shared by the pump installation floor 10 can be reduced, so that the pump weight increases from the existing pump. Even if it becomes, the capacity | capacitance vertical axis | shaft pump 50 can be installed, without causing the shortage of the load capacity of the floor surface of the existing pump installation floor 10. Here, since the outer cylinder 1 itself is placed on the bottom surface 4 of the water tank, the load of the pump body 2 can be adjusted by simply placing the outer cylinder 1 without draining the entire water in the suction water tank 3. 1 can be shared by the pump installation floor 10.

  As shown in FIGS. 2 and 3, a gate 7 that opens and closes the suction opening 6 is provided inside the suction opening 6. The gate 7 is formed of a cylindrical member having an outer peripheral surface slightly smaller in diameter than the inner periphery of the outer cylinder 1. Ring-shaped O-rings 8 are fitted on the outer peripheral surface of the gate 7 above and below the suction opening 6 so as to keep the gate 7 watertight.

  The outer cylinder 1 with the suction opening 6 closed by the gate 7 is placed in the suction water tank 3 through the pump insertion hole 11 of the pump installation floor 10, and its lower end 1 a is placed on the water tank bottom surface 4 in a watertight manner. In this state, the water in the outer cylinder 1 is removed. This removal of water can be performed very easily as compared to removing the entire water in the suction water tank 3.

  In a state where water in the suction water tank 3 is removed, a vortex preventing device 19 having a cross-shaped cross section is attached to the water tank bottom surface 4 in the outer cylinder 1. Even if the flow velocity of the bell mouth 17 at the pump inlet is increased by increasing the pump capacity, the vortex preventing device 19 can prevent the generation of vortex harmful to the pump.

  With the vortex prevention device 19 attached, the gate 7 is pulled up and removed from the outer cylinder 1. As a result, water flows into the outer cylinder 1 through the suction opening 6. A lifting tool 9 is attached to the upper end of the gate 7, and the lifting tool 9 can be used to easily lift the gate 7.

With the gate 7 removed and the outer cylinder 1 filled with water, the pump body 2 is housed in the outer cylinder 1 as shown in FIG. Installation of the vertical shaft pump 50 is completed by mounting on the part 1b and fixing with a fastener such as a bolt. The pump body 2 can be removed from the outer cylinder 1 by removing the fastener.
(Second to twelfth embodiments)
Next, second to twelfth embodiments of the present invention will be described with reference to FIGS. These second to first embodiments are different from the first embodiment in the points described below, and other points are basically the same as those in the first embodiment. Omitted.

  In the second embodiment shown in FIG. 4, there is provided pressure jetting means for jetting pressure water from the jet outlet 12 of the lower end portion 1 a of the outer cylinder 1 to remove mud, dust and the like accumulated on the water tank bottom surface 4. . Pressure water is supplied to the jet nozzle 12 from above the outer cylinder 1 via a hose 13.

  According to the second embodiment, when the outer cylinder 1 is placed on the water tank bottom surface 4 of the suction water tank 3, the top of the water tank bottom surface 4 can be cleaned by ejecting the pressure water from the spout 12; The close contact between the water tank bottom surface 4 and the lower end surface of the outer cylinder 1 when the outer cylinder 1 is installed in the suction water tank 3 can be improved.

  In 3rd Embodiment shown in FIG. 5, the flexible sealing ring 14 which maintains the watertightness between the lower end part 1a of the outer cylinder 1 and the water tank bottom face 4 is attached to the lower end part 1a of the outer cylinder 1. In FIG. . When the outer cylinder 1 is placed on the water tank bottom surface 4, the sealing ring 14 is deformed by the weight of the outer cylinder 1 and is in close contact with the water tank bottom surface 4.

  According to the third embodiment, the sealing ring 14 can improve the close contact with the water tank bottom surface 4.

  In the fourth embodiment shown in FIG. 6, the concrete 16 is solidified on the water tank bottom surface 4 in the outer cylinder 1 in a state where the suction opening 6 is closed by the gate 7 and the water in the outer cylinder 1 is excluded. A flange portion provided on the inner periphery of the lower end 1 a of the outer cylinder 1 is placed on the concrete 16, and the outer cylinder 1 is fixed to the concrete 16 with bolts 15.

  According to this 4th Embodiment, the water tank bottom face 4 can be reinforced with the concrete 16, and the vertical shaft pump 50 can be supported.

  7 and 8 show still another embodiment of the present invention, which is different from the embodiment shown in FIG. 1 in that concrete 16 is provided on the aquarium floor 4 in order to fix the outer cylinder 1 more securely. To do. Here, in the fifth embodiment shown in FIG. 7, the eddy current preventing device 19 has a cross shape extending in the axial direction, whereas in the sixth embodiment shown in FIG. It has a trumpet shape.

  In the seventh embodiment shown in FIG. 9, instead of the eddy current preventing device 19 of the first embodiment, a disk ring-shaped eddy current preventing device 20 is provided on the outer wall surface of the outer cylinder 1. In the eighth embodiment shown in FIG. 10, instead of the eddy current prevention device 19 of the first embodiment, an eddy current prevention device 20 having a cylindrical shape and a large number of holes on the outer wall surface of the outer cylinder 1 is provided.

  In the ninth embodiment shown in FIG. 11, the gate 7 can be opened and closed at any time. That is, when the pump tank 2 is connected to the suction water tank 3 through the opening 6 provided at the lower portion of the outer cylinder 1 at the time of pump operation or the like, the gate 7 is pulled up by the lifting tool 9. On the other hand, when the suction water tank 3 and the pump 2 are shut off, the gate 7 is pulled down by the lifting tool 9. By pulling down the gate 7, the suction water tank 3 and the outer cylinder 1, that is, the pump 2 can be shut off. In this shut-off state, compressed air is fed into the outer cylinder 1, the water handled by the pump in the outer cylinder 1 is removed from the communication pipe 22, and the pump 2 is avoided from being submerged, so that corrosion or pump 2 is introduced into the outer cylinder 1. Deposit accumulation can be prevented. Further, as another means, the anticorrosion effect can be further enhanced by filling the outer cylinder 1 with clean water that is cleaner than the water handled by the pump or further filling the outer cylinder 1 with a solution containing an inhibitor for corrosion protection.

  In the tenth embodiment shown in FIG. 12, the outer diameter portion of the bell mouth 17 of the pump main body 2 and the sliding surface of the gate 7 of the outer cylinder 1 are made into a minute gap. Thereby, vibration of the pump can be suppressed.

  In the eleventh embodiment shown in FIG. 13, the outer cylinder 1 has the structure shown in FIG. 6, and the pump body 2 has a pull-out structure. Thereby, the mass of the pump bell mouth 17 and the bowl casing part 18 will be supported by the outer cylinder 1, and the load reduction of the pump installation floor 10 can be aimed at.

It is a figure which shows the state which installed the vertical axis | shaft pump of 1st Embodiment of this invention. It is a figure which shows the state in the middle of installation of the vertical axis | shaft pump of FIG. FIG. 2 is an enlarged detail view of a lower portion of an outer cylinder of the vertical axis pump of FIG. 1. It is detail drawing of the outer cylinder lower part of the vertical axis | shaft pump of 2nd Embodiment of this invention. It is detail drawing of the outer cylinder lower part of the vertical axis | shaft pump of 3rd Embodiment of this invention. It is detail drawing of the outer cylinder lower part of the vertical axis | shaft pump of 4th Embodiment of this invention. It is detail drawing of the lower part of the vertical axis | shaft pump of 5th Embodiment of this invention. It is detail drawing of the lower part of the vertical axis | shaft pump of 6th Embodiment of this invention. It is a figure which shows the state which installed the vertical axis | shaft pump of 7th Embodiment of this invention. It is a figure which shows the state which installed the vertical axis | shaft pump of 8th Embodiment of this invention. It is detail drawing of the lower part of the vertical axis | shaft pump of 9th Embodiment of this invention. It is detail drawing of the lower part of the vertical axis | shaft pump of 10th Embodiment of this invention. It is a figure which shows the state which installed the vertical axis | shaft pump of 11th Embodiment of this invention .

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Outer cylinder, 1a ... Lower end part, 1b ... Upper end part, 2 ... Pump main body, 3 ... Suction water tank, 4 ... Water tank bottom surface, 5 ... Base, 6 ... Suction opening part, 7 ... Gate, 8 ... Packing, 9 ... Suspension tool, 10 ... pump installation floor, 11 ... pump insertion hole, 12 ... pressure water outlet, 13 ... pressure water supply hose, 14 ... sealing water ring, 15 ... bolt, 16 ... concrete, 17 ... bell mouth, 18 ... Bowl casing part, 19 ... Eddy current prevention device, 20 ... Eddy current prevention device, 21 ... Installation outer cylinder, 22 ... Communication pipe, 50 ... Vertical axis pump.

Claims (11)

In the vertical shaft installed in the pump station, comprising an outer cylinder arranged in the suction water tank through a pump insertion hole provided in the pump installation floor, and a pump body arranged in the outer cylinder,
The lower end of the outer cylinder is placed on the bottom of the water tank in the suction water tank, the outer cylinder is provided from the bottom of the water tank over the height of the maximum suction level, and the upper end of the outer cylinder is attached to the pump installation floor. Vertical shaft pump characterized by that.   2. The apparatus according to claim 1, further comprising: a gate that places the lower end portion of the outer cylinder on the bottom of the water tank in a watertight manner, provides a suction opening at a lower portion of the outer cylinder, and opens and closes the suction opening. Vertical shaft pump.   The vertical shaft pump according to claim 2, further comprising a vortex prevention device attached to the bottom surface of the water tank in the outer cylinder in a state where the suction opening is closed by the gate and water in the outer cylinder is excluded. .   The vertical shaft pump according to claim 2, further comprising pressure jetting means for jetting pressure water from a jet outlet at a lower end portion of the outer cylinder to remove mud, dust and the like accumulated on the bottom surface of the water tank.   The vertical shaft pump according to claim 2, wherein a flexible sealing ring that maintains watertightness between the lower end portion of the outer cylinder and the bottom surface of the water tank is attached to the lower end portion of the outer cylinder.   3. The lower cylinder of the outer cylinder according to claim 2, wherein the suction opening is closed by the gate and the water in the outer cylinder is removed, and the concrete is solidified on the bottom of the water tank in the outer cylinder. Vertical shaft pump characterized by fixing and supporting the flange part.   The vertical shaft pump according to claim 1, wherein the outer cylinder having an eddy current preventing device on an outer wall surface is disposed in the suction water tank through the pump insertion hole.   2. The vertical shaft pump according to claim 1, wherein the pump body is detachably mounted from the outer cylinder, and a gap between the outer periphery of the lower end of the bell mouth of the pump body and the inner peripheral surface of the outer cylinder is made small. .   The vertical shaft pump according to claim 1, wherein the pump body has a pull-out structure.   2. The vertical pump according to claim 1, wherein the vertical pump is installed in an existing pump station, and the pump body is detachably supported on the outer cylinder. An outer cylinder arranged in the suction water tank through a pump insertion hole provided in the pump installation floor, and a pump body arranged in the outer cylinder, and a lower end portion of the outer cylinder placed on the bottom of the water tank in a watertight manner The upper end of the outer cylinder is set to a height higher than the maximum suction water level of the suction water tank, a suction opening is provided at the lower part of the outer cylinder, and a vertical shaft pump including a gate for opening and closing the suction opening is used.
When the vertical pump is operated, the gate is opened, and when the vertical pump is stopped for a long time, the gate is closed and the outer cylinder is filled with an anticorrosive fluid such as air, a liquid having low corrosive properties, a solution of a corrosion inhibitor, or the like. A method of operating a vertical shaft pump characterized in that

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