JP2009299488A - Vertical shaft pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a height of a delivery elbow 10 from a mounting floor when installed and reduce a height from the mounting floor after installed, in a vertical shaft pump. <P>SOLUTION: A straight suspended pipe 9 has an upper end fixed to the mounting floor 4 and coupled to the delivery elbow 10. The upper end of a lifting pipe 6 is coupled to the lower end of the suspended pipe 9. A casing 17 of a reduction gear 16 has a first portion 18 built into the suspended pipe 9, a second portion 19 passing through the pipe wall of the suspended pipe 9 and having one end connected to the first portion 18 and the other end arranged outside the suspended pipe 9, and a third portion 20 connected to the other end of the second portion 19. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vertical shaft pump.

  Conventionally, various attempts to reduce the height of the vertical shaft pump have been proposed. For example, Patent Document 1 discloses a vertical shaft pump in which a speed reduction device that connects a prime mover side and a main shaft side is integrally provided on an upper outer surface of a discharge elbow. Patent Document 2 discloses a vertical shaft pump in which a reduction gear is built in a discharge elbow. Furthermore, Patent Document 3 discloses a vertical shaft pump having a speed reducer built in the vicinity of an impeller in a pumping pipe.

  However, the vertical shaft pump described in Patent Document 1 has a structure in which the main shaft protrudes greatly upward from the installation floor, and at the time of installation, the discharge elbow integrally provided with the speed reducer is lifted to the maximum lifting height above the upper end of the main shaft. There is a need. If the height of a crane (for example, an overhead crane) in the machine building is low and the discharge elbow cannot be lifted to a sufficient height, it becomes difficult or impossible to install. When the horizontal axis pump of the drainage station is changed to this type of vertical axis pump, generally the height of the crane for the horizontal axis pump is low and the maximum lifting height may not be ensured.

  In the vertical shaft pump described in Patent Document 2, since the speed reduction device exists in the discharge elbow where the water flow is changed from the vertical direction to the horizontal direction, the fluid resistance in the discharge elbow increases. As a result, the pressure loss in the discharge elbow increases and the pump efficiency decreases.

  It is inconvenient for maintenance if there is a reduction gear in the vicinity of the impeller in the pumping pipe, that is, in the vicinity of the lower end of the pump casing as in the vertical shaft pump described in Patent Document 3. For example, it is necessary to pull up and disassemble the entire pump casing in order to diagnose a failure of the reduction gear.

Japanese Patent No. 3306749 Japanese Patent No. 3623135 JP 2001-73982 A

  In the vertical shaft pump, the height from the installation floor is realized while reducing the height at which the discharge elbow needs to be lifted from the installation floor at the time of installation, ensuring good pump efficiency, ease of maintenance, etc. The problem is to keep the value low.

  The present invention includes a pumping pipe that extends in the vertical direction and has a suction port disposed on the lower end side, a main shaft that extends in the vertical direction in the pumping pipe and has an impeller fixed to the lower end side, and an upper end side of the pumping pipe In a vertical shaft pump having a discharge elbow disposed on the straight pipe, a straight tubular suspension pipe having an upper end fixed to the installation floor and connected to the discharge elbow and connected to the lower end on the upper end of the pumping pipe. The speed reducer includes a first part built in the suspension pipe, a tube wall of the suspension pipe, one end connected to the first part, and the other end suspended from the suspension A casing having a second portion disposed outside the tube, a third portion disposed outside the suspension tube and connected to the other end of the second portion, and extending in a vertical direction, The upper end side is disposed in the first portion, and the lower end side is the An output shaft that is located outside the casing and connected to the upper end of the main shaft, extends in the horizontal direction, one end is disposed in the third portion, and the other end is located outside the casing and is on the prime mover side An vertical shaft pump comprising: an input shaft coupled to the power supply; and a power transmission mechanism disposed in the casing and configured to transmit rotation input to the input shaft from the prime mover side to the output shaft. To do.

  The first part of the casing of the reduction gear is built in the suspension pipe, the second part penetrates the suspension pipe, and the third part is arranged outside the suspension pipe. Therefore, the uppermost part of the casing of the reduction gear can be set to a height equal to or lower than the uppermost part of the discharge elbow, and the height of the vertical pump from the installation floor can be kept low.

  Since the first part of the casing of the reduction gear is built in a suspension pipe whose upper end is fixed to the installation floor, that is, a suspension pipe on the lower side of the installation floor, the upper end of the spindle protrudes from the installation floor. Absent. Further, as described above, the uppermost part of the casing of the speed reducer can be set to a height that is lower than the uppermost part of the discharge elbow. For these reasons, the height at which the discharge elbow needs to be lifted from the installation floor during installation can be reduced. As a result, when changing from a horizontal shaft pump to a vertical shaft pump, for example, the discharge elbow can be reliably lifted to a required height by a crane (for example, an overhead crane) in a building having a relatively low height. That is, even when changing from a horizontal axis pump to a vertical axis pump, it can be installed with a crane built in the building of the machine.

  The first part of the casing of the speed reducer is arranged not in the discharge elbow where the direction of the water flow is changed from the vertical direction to the horizontal direction, but in a straight tubular suspension pipe. Therefore, there are no obstacles such as protrusions that increase fluid resistance in the discharge elbow, and pressure loss in the discharge elbow can be reduced, so that pump efficiency can be increased. By optimally setting the cross-sectional area of the flow path between the suspension pipe and the casing of the speed reducer with respect to the cross-sectional area of the pumping pipe, specifically, by setting these cross-sectional areas equal to each other Pressure loss can be reduced.

  The speed reducer has a casing in which a part (first part) is built in a suspension pipe whose upper end is fixed to the installation floor, not in the vicinity of the impeller in the pumping pipe. Accordingly, maintenance of the reduction gear is easy. For example, it is not necessary to pull up and disassemble the entire pump casing for diagnosis of the speed reducer failure.

  As compared with the case where the casing of the speed reduction device is arranged on the suspension pipe fixed to the installation floor, and the casing of the speed reduction device is arranged on the discharge elbow, the speed reduction device is located closer to the installation floor. Therefore, it is possible to reduce the vibration and noise generated by the speed reducer when the vertical pump is operated. Further, since the first portion of the casing of the speed reducer is built in the suspension pipe, noise generated by the speed reducer when the vertical shaft pump is operated can be reduced.

  Lubricating oil is sealed in at least a part of the space in the casing of the speed reducer, and deforms according to a differential pressure between the pressure of the lubricating oil in the space and the static pressure of the flow path in the suspension pipe. It is preferable to further include an automatic pressure adjusting device that changes the volume of the space so that the pressure of the lubricating oil becomes equal to the static pressure in the flow path.

  By providing this automatic pressure regulator, it is possible to prevent the lubricating oil from leaking into the flow path in the suspension pipe of the casing of the speed reducer due to the pressure difference between the inside and outside of the casing of the speed reducer. In addition, it is possible to prevent moisture from entering the casing from the flow path in the suspension pipe due to the pressure difference between the inside and outside of the casing of the reduction gear.

  It is preferable to further include a drain pipe having one end communicating with the bottom side of the first portion of the casing and the other end opened to the atmosphere.

  Moisture generated by dew condensation in the casing of the speed reducer or moisture that has entered the casing from the flow path in the suspension pipe is quickly discharged from the bottom of the first portion to the outside of the casing through the drain pipe. . Therefore, by providing this drain pipe, it is possible to prevent the lubricating oil sealed in the casing of the speed reducer from being deteriorated by moisture.

  In the vertical shaft pump of the present invention, the height from the installation floor is reduced while realizing the reduction of the height required to lift the discharge elbow from the installation floor at the time of installation, ensuring good pump efficiency, ease of maintenance, etc. It can be kept low.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)
1 to 3 show a vertical pump 1 according to a first embodiment of the present invention. A pump casing 2 of the vertical shaft pump 1 is fixed to an installation floor 4 provided above the water tank 3. The pump casing 2 has a straight tubular pumping pipe 6 extending in the vertical direction, a vane casing 7 connected to the lower end of the pumping pipe 6, and a bell connected to the lower end of the vane casing 7 so that the lower end forms a suction port 8 a. A mouse 8 is provided. Further, the pump casing 2 includes a discharge elbow 10 connected to the upper end side of the pumped water pipe 6 via a suspension pipe 9 and a base plate 30 described later. The discharge elbow 10 is curved from the vertical direction to the horizontal direction toward the discharge port 10a at the upper end. The discharge port 10a is connected to a pipe (not shown) to the discharge water tank side.

  In the pump casing 2, a main shaft 11 extending in the vertical direction is rotatably supported by underwater bearings 12A and 12B. An impeller 13 is fixed to the lower end of the main shaft 11 located in the vane casing 7. On the other hand, the upper end of the main shaft 11 located in the vicinity of the upper end of the water pump 6 is connected to an output shaft 21 of a speed reducer 16 described later via a coupling 14.

  The suspension pipe 9 has a straight tube shape with both ends open, and includes a flange 9a to which the base plate 30 is fixed at the upper end, and a flange 9b for suspending the pumped water pipe 6 to the lower end side. A through hole 4 a for inserting the pump casing 2 is formed in the installation floor 4. The base plate 30 is fixed to the upper surface of the installation floor 4 near the hole edge of the through hole 4a. The upper end side (flange 9 a) of the suspension pipe 9 is fixed to the lower surface of the base plate 30, and the discharge elbow 10 is fixed to the upper surface of the base plate 30. The suspension pipe 9 and the pumping pipe 6 fixed to the flange 9 b on the lower end side of the suspension pipe 9 are inserted into the through hole 4 a and extend toward the bottom of the water tank 3. In FIG. 2, 9d is a bolt hole through which a bolt (not shown) for connection with the pumped pipe 6 provided in the flange 9b is inserted.

  A prime mover (not shown) is disposed on the installation floor 4, and an output shaft of the prime mover extends in the horizontal direction. The vertical shaft pump 1 includes a reduction gear 16 that decelerates and transmits the rotation of the output shaft of the prime mover to the main shaft 11 and converts the direction of the rotation shaft from the horizontal direction to the vertical direction. In other words, the speed reducer 16 functions as a converter for transmitting the driving force.

  The casing 17 of the speed reducer 16 is provided integrally with the suspension pipe 9, and the inside thereof is sealed against the atmosphere and flowing water in the pump casing 2. The casing 17 includes a first part 18 built in the suspension pipe 5, a second part 19 penetrating the pipe wall of the suspension pipe 9, and a third part arranged outside the suspension pipe 5. 20.

  The first portion 18 of the casing 17 includes a cylindrical portion 18a extending in the vertical direction, and hemispherical shell portions 18b and 18c provided at the lower and upper ends of the cylindrical portion 18a. The first portion 18 is arranged so that the axis of the cylindrical portion 18 a coincides with the axis of the flow path (circular cross section) in the suspension pipe 9. Due to the shape and arrangement of the first portion 18, an increase in flow resistance due to the incorporation of the first portion 18 in the suspension pipe 9 is suppressed to a minimum. Although the upper cylindrical portion 18a slightly protrudes from the lower end of the discharge elbow 10, the discharge elbow 10 is a straight tube extending in the vertical direction in this portion. That is, the first portion 18 of the casing 17 does not enter the portion where the discharge elbow 10 is bent from the vertical direction to the horizontal direction.

  The second portion 19 of the casing 17 is a cylindrical portion extending in the horizontal direction and penetrates the vicinity of the upper end of the tube wall of the suspension tube 9. One end of the second portion 19 (the right end portion in the figure) is located in the suspension tube 9 and is connected to the cylindrical portion 18 a of the first portion 18. The other end (the left end in the figure) of the second portion 19 is located outside the suspension tube 9 and is connected to the third portion 20.

  The third portion 20 of the casing 17 has a substantially rectangular parallelepiped hollow box shape, the bottom wall of which is constituted by the lower flange 9b of the suspension pipe 9, and the lower right portion of FIG. It is constituted by the tube wall of the tube 9.

  The output shaft 21 of the speed reducer 16 extends in the vertical direction, the upper end is disposed in the first portion 18 of the casing 17, and the lower end is located outside the first portion 18 and inside the hanging tube 9. The lower end of the output shaft 21 is connected to the upper end of the main shaft 11 by the coupling 14 as described above. The output shaft 21 is rotatably supported while being positioned in the thrust direction by a bearing 22. Further, shaft sealing devices 24A and 24B are attached to a portion where the output shaft 21 penetrates the lower hemispherical shell portion 18c of the first portion 18 and a portion spaced above the portion, respectively. Yes.

  The input shaft 26 of the speed reducer 16 extends in the horizontal direction and is rotatably supported by a ball bearing 23D in the third portion 20 of the casing 17. The input shaft 26 has one end (right end in the figure) disposed in the third portion 20 of the casing 17 and the other end (left end in the figure) disposed outside the casing 17. The other end of the input shaft 26 is connected to the prime mover as described above. A shaft sealing device 24C is attached to a portion of the third portion 20 through which the input shaft 26 passes.

  In the present embodiment, the power transmission mechanism that transmits the rotation input from the prime mover to the input shaft 26 to the output shaft 21 includes a pair of spur gears 27A and 27B, an intermediate shaft 28, and a pair of bevel gears 29A and 29B. ing. First, a spur gear 27 </ b> A is fixed to one end of the input shaft 26. A spur gear 27B that meshes with the spur gear 27A is fixed to one end of an intermediate shaft 28 that extends in the horizontal direction. The intermediate shaft 28 is rotatably supported by a ball bearing 23E in the third portion 20 of the casing 17 and two ball bearings 23F and 23G in the second portion 19. A bevel gear 29 </ b> A fixed to the other end of the intermediate shaft 28 meshes with a bevel gear 29 </ b> B fixed to the upper end of the output shaft 21. The rotation of the prime mover input to the input shaft 26 is transmitted to the output shaft 21 via the spur gear 27A, the spur gear 27B, the intermediate shaft 28, the bevel gear 29A, and the bevel gear 29B. During this time, the rotation speed is reduced and the direction of the rotation axis is changed from the horizontal direction to the vertical direction.

  The vertical pump 1 of the present embodiment having the above configuration has the following characteristics.

  First, the casing 17 of the speed reducer 16 has a first portion 18 built in the suspension tube 9, a second portion 19 penetrating the suspension tube, and a third portion 20 outside the suspension tube 9. Is arranged. Therefore, the uppermost part of the casing 17 of the speed reducer 16 can be set to a height below the uppermost part of the discharge elbow 10, and the height of the vertical pump 1 from the installation floor 4 can be kept low. Therefore, it is not necessary to install another floor provided with the prime mover above the installation floor 4, nor to install the prime mover on a large and high pedestal installed on the installation floor 4.

  Since the first portion 18 of the casing 17 of the speed reducer 16 is built in the suspension pipe 9 whose upper end is fixed to the installation floor 4, that is, the suspension pipe 9 below the installation floor 4. The upper end of the projection does not protrude from the installation floor 4. Further, as described above, the uppermost portion of the casing of the reduction gear 16 can be set to a height that is lower than the uppermost portion of the discharge elbow 10. For these reasons, the height at which the discharge elbow 10 needs to be lifted from the installation floor 4 during installation can be reduced. As a result, for example, when changing from the horizontal shaft pump to the vertical shaft pump 1 of the present embodiment, the discharge elbow 10 is reliably lifted to a required height by a crane (for example, an overhead crane) in a building having a relatively low height. be able to. That is, even when the vertical shaft pump 1 of the present embodiment is changed from the horizontal shaft pump in the existing pump station, it can be installed with a crane that is originally in the building of the station.

  The first portion 18 of the casing 17 of the speed reducer 16 is disposed not in the discharge elbow 10 where the flow direction of the pumped water is bent from the vertical direction to the horizontal direction but in the straight tubular suspension pipe 9. Yes. Therefore, there are no obstacles such as protrusions that increase the fluid resistance in the discharge elbow 10, and the pressure loss in the discharge elbow 10 is not reduced, so that the pump efficiency can be increased accordingly. Pressure loss can be reduced by optimally setting the flow path cross-sectional area 51 between the suspension pipe 9 and the casing 17 of the speed reducer 16 with respect to the flow path cross-sectional area 50 of the pumped-up pipe 6. Specifically, FIG. 1 and FIG. 2 schematically show the magnitude relation between these flow path cross-sectional areas 50 and 51, but the flow path cross-sectional area between the suspension pipe 9 and the casing 17 of the speed reducer 16. The pressure loss can be reduced by setting 51 equal to the channel cross-sectional area 50 of the water pump 6.

  The speed reduction device 16 is not in the vane casing 7 (in the vicinity of the impeller 13) that is the lower end side of the pump casing 2, but in the suspension pipe 9 whose upper end side is fixed to the installation floor 4 (first portion 18). It has a built-in casing 17. Therefore, maintenance of the reduction gear 16 is easy. For example, there is no need to pull up and disassemble the entire pump casing 2 for failure diagnosis of the reduction gear 16.

  The casing 17 of the speed reducer 16 is disposed on the suspension pipe 9 fixed to the installation floor 4. Compared with the case where the casing of the speed reducer is disposed on the discharge elbow 10, the speed reducer 16 is closer to the installation floor 4. Are arranged. Therefore, vibration and noise generated by the reduction gear 16 when the vertical shaft pump 1 is operated can be reduced. Further, since the first portion 18 of the casing 17 of the speed reducer 16 is built in the suspension pipe 9 (arranged in the flow of pumped water), the operation of the vertical pump 1 is also performed in this respect. Sometimes the noise generated by the speed reducer 16 is reduced.

  Referring to FIG. 1, the inside of the casing 17 of the speed reducer 16 includes a first space 31 </ b> A on the upper side by the shaft seal device 24 </ b> A and a second lower side than the shaft seal device 24 </ b> A (the bottom side of the first portion 18). Space 31B. The first and second spaces 31A and 31B are sealed with each other by a shaft seal device 24A. The power transmission mechanisms (spur gears 27A, 27B, intermediate shaft 28, and bevel gears 29A, 29B) are all disposed in the first space 31A, and lubricating oil is sealed in the first space 31A. . In other words, the entire first space 31A is filled with lubricating oil.

  An automatic pressure adjusting device 33 is provided for maintaining the pressure of the lubricating oil in the first space 31 </ b> A equal to the static pressure of the flow path in the suspension pipe 9. The automatic pressure adjusting device 33 includes a pressure introducing pipe 34 having both ends opened and a bellows 35 (variable member) having one end opened and the other end closed. One end of the pressure introducing pipe 34 is attached to a through hole 18d that penetrates the hemispherical shell-shaped portion 18b of the first portion 18 of the casing 17 and communicates the first space 31A with the pumping water flow path. An open end of a bellows 35 is attached to the other end of the pressure introducing pipe 34. Even if the bellows 35 has a plurality of annular protrusions formed at intervals by applying pressure from the inside to a cylindrical body made of metal or the like, the inner edge and the outer edge are alternately formed on a plurality of thin and corrugated annular plates. It may be formed by joining.

  The pressure of the lubricating oil in the first space 31 </ b> A acts on one side (lower side in the figure) of the closed end of the bellows 35. The static pressure of the flow path in the suspension pipe 9 acts on the other side (upper side in the drawing) of the closed end of the bellows 35 via the pressure introduction pipe 34. In other words, a differential pressure between the pressure of the lubricating oil and the static pressure of the flow path acts on the closed end of the bellows 35. A through hole 18 d connected to one end of the pressure introducing pipe 34 is provided in the cylindrical portion 18 a of the first portion 18 of the casing 17, and is orthogonal to the water flow direction in the flow path in the hanging pipe 9. Have an opening. Thereby, the static pressure acts on the other side of the closed end of the bellows 35, but the dynamic pressure hardly acts.

  When the pressure of the lubricating oil and the static pressure of the flow path are balanced to a state where the pressure of the lubricating oil is higher than the static pressure of the flow path, the bellows 35 contracts by an amount corresponding to the differential pressure. The volume of the space 31A increases. As a result, the pressure of the lubricating oil in the first space 31A decreases, and the state returns to a state where the pressure of the lubricating oil and the static pressure of the flow path are balanced. On the contrary, when the pressure of the lubricating oil and the static pressure of the flow path are in balance, when the static pressure of the flow path changes to a higher state than the pressure of the lubricating oil, the bellows 35 is an amount corresponding to the magnitude of the differential pressure. Since it extends, the volume of the first space 31A decreases. As a result, the pressure of the lubricating oil in the first space 31A increases, and the state returns to a state where the pressure of the lubricating oil and the static pressure of the flow path are balanced. As described above, the automatic pressure adjusting device 33 can maintain the pressure of the lubricating oil in the first space 31A and the static pressure of the flow path in a balanced state. Therefore, leakage of the lubricating oil from the first space 31A to the flow path in the suspension pipe 9 (which occurs due to the fact that the pressure of the lubricating oil is higher than the static pressure of the flow path) can be prevented. In addition, it is possible to prevent moisture from entering the first space 31A from the flow path in the suspension pipe 9 (which occurs due to the static pressure of the flow path being higher than the pressure of the lubricating oil).

  The second space 31 </ b> B of the casing 17 of the speed reduction device 16 communicates with the atmosphere by a drain pipe 36. The drain pipe 36 has one end opened to the second space 31B in the casing 17 and the other end opened to the atmosphere.

  Moisture generated by dew condensation in the first portion 18 of the casing 17 or moisture that has entered the first portion 18 from the flow path in the suspension pipe 9 is the second space on the bottom side of the first portion 18. Collected at 31 </ b> B and quickly drained out of the casing 17 of the speed reducer 16 together with the lubricating oil through the drain pipe 36. Therefore, by providing this drain pipe 36, it is possible to prevent the lubricating oil enclosed in the casing 17 from being deteriorated by the influence of moisture.

(Second Embodiment)
4 and 5 show a vertical shaft pump 1 according to a second embodiment of the present invention. The present embodiment is different from the first embodiment in the power transmission mechanism that transmits the rotation input from the prime mover to the input shaft 26 to the output shaft 21. In the present embodiment, the power transmission mechanism includes three pairs of bevel gears 41A to 41F and two intermediate shafts 42A and 42B. First, a bevel gear 41 </ b> A is fixed to one end of the input shaft 26. The bevel gear 41B meshing with the bevel gear 41A is fixed to the upper end of the first intermediate shaft 42A extending in the vertical direction. The first intermediate shaft 42A is accommodated in the third portion 20 of the casing 17, and is rotatably supported by a ball bearing 23I. A bevel gear 41C is fixed to the lower end of the first intermediate shaft 42A. A bevel gear 41D meshing with the bevel gear 41C is fixed to one end of a second intermediate shaft 42B extending in the horizontal direction. One end of the second intermediate shaft 42 </ b> B is disposed in the third portion 20, but the other end passes through the second portion 19 and is disposed in the first portion 18. The second intermediate shaft 42 </ b> B is rotatably supported by a ball bearing 23 </ b> J in the second portion 19. A bevel gear 41E fixed to the other end of the second intermediate shaft 42B meshes with a bevel gear 41F fixed to the upper end of the output shaft 21. The rotation from the prime mover input to the input shaft 26 includes a bevel gear 41A, a bevel gear 41B, a first intermediate shaft 42A, a bevel gear 41C, a bevel gear 41D, a second intermediate shaft 42B, a bevel gear 41E, and a bevel gear. It is transmitted to the output shaft 21 via 41F. During this time, the rotation speed is reduced and the direction of the rotation axis is changed from the horizontal direction to the vertical direction.

  Other configurations and operations of the second embodiment are the same as those of the first embodiment. Therefore, the same elements are denoted by the same reference numerals and description thereof is omitted.

  The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, a mechanism for analyzing the components of the lubricating oil sealed in the first space 31A of the casing 17 of the speed reducer 16 at any time or at regular time intervals is provided, thereby monitoring the presence or absence of wear or failure of various bearings. May be.

1 is a longitudinal sectional view showing a vertical shaft pump according to a first embodiment of the present invention. Sectional drawing in the II-II line of FIG. The elements on larger scale of FIG. The longitudinal cross-sectional view which shows the vertical shaft pump concerning 2nd Embodiment of this invention. The elements on larger scale of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vertical shaft pump 2 Pump casing 3 Water tank 4 Installation floor 4a Through-hole 6 Pumping pipe 7 Vane casing 8 Bell mouth 8a Suction port 9 Suspension tube 9a, 9b Flange 9c Base plate 9d Bolt hole 10 Discharge elbow 10a Discharge port 11 Main shaft 12A, 12B Underwater bearing 13 Impeller 14 Coupling 16 Reduction gear 17 Casing 18 First part 18a Cylindrical part 18b, 18c Hemispherical shell-like part 18d, 18e Through hole 19 Second part 20 Third part 21 Output shaft 22 Hollow shaft 23D-23J Ball bearings 24A-24C Shaft seal device 26 Input shaft 27A, 27B Spur gears 28, 42A, 42B Intermediate shafts 29A, 29B, 41A-41F Bevel gears 30 Base plate 31A First space 31B Second space 33 Automatic adjustment Pressure device 34 Pressure introduction Pipe 35 Bellows 36 Drain pipe 37 Gate valve 50, 51 Channel cross-sectional area

Claims (3)

A pumping pipe that extends in the vertical direction and has a suction port disposed at the lower end, a main shaft that extends in the vertical direction within the pumping pipe and that has an impeller fixed at the lower end, and is disposed at the upper end of the pumping pipe. In a vertical shaft pump equipped with a discharge elbow,
A straight tubular suspension pipe having an upper end fixed to the installation floor and connected to the discharge elbow, and a lower end connected to the upper end of the pumping pipe;
The speed reducer is
A first part built in the suspension pipe and a pipe wall penetrating the suspension pipe, having one end connected to the first part and the other end disposed outside the suspension pipe. A casing having a second portion and a third portion disposed outside the suspension pipe and connected to the other end of the second portion;
An output shaft extending in a vertical direction, having an upper end side disposed in the first portion, a lower end side being located outside the casing and connected to the upper end of the main shaft;
An input shaft extending in the horizontal direction, having one end disposed in the third portion and the other end positioned outside the casing and connected to the prime mover side;
A vertical shaft pump, comprising: a power transmission mechanism disposed in the casing and configured to transmit rotation input to the input shaft from the prime mover side to the output shaft. Lubricating oil is sealed in at least a part of the space in the casing of the reduction gear,
The space is deformed according to a differential pressure between the pressure of the lubricating oil in the space and the static pressure of the flow path in the suspension pipe, and the pressure of the lubricating oil becomes equal to the static pressure in the flow path. The vertical shaft pump according to claim 1, further comprising an automatic pressure adjusting device that changes a volume of the vertical shaft.   The vertical shaft pump according to claim 2, further comprising a drain pipe having one end communicating with the bottom side of the first portion of the casing and the other end opened to the atmosphere.

Images