JP4580964B2 - Vertical shaft pump - Google Patents

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 reducer is integrally provided on the upper outer surface of a discharge elbow. Patent Document 2 discloses a vertical shaft pump in which a part of a reduction gear is built in a discharge elbow. Further, Patent Document 3 discloses a vertical shaft pump in which a speed reduction mechanism is built in an intermediate casing.

  However, the vertical shaft pumps described in any of Patent Documents 1 to 3 are not sufficiently considered for operation in the air (dry operation) without pumping or when the pumped water is seawater. . Specifically, in the vertical shaft pumps described in any of Patent Documents 1 to 3, no special consideration is given to improving the reliability of the bearing that supports the main shaft.

  In each of the vertical shaft pumps described in Patent Documents 1 and 2, since the speed reducer is disposed in the discharge elbow, the speed reducer is located at a certain distance above the installation floor to which the vertical shaft pump is fixed. To do. Therefore, there is a tendency that vibration and noise generated by the speed reducer during operation of the vertical shaft pump increase.

  Further, in the vertical shaft pump described in Patent Document 2, since the speed reducing 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 is increased. As a result, the pressure loss in the discharge elbow increases and the pump efficiency decreases.

  Furthermore, the vertical shaft pump described in Patent Document 3 is inconvenient to maintain because there is a speed reducer in the intermediate casing that is normally located in the water in the water tank. Specifically, it is necessary to pull up the entire casing of the vertical pump from the water tank for failure diagnosis or the like.

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

  The present invention can also be applied to the operation in the air without pumping (dry operation) or the pumped water is seawater while suppressing the height from the installation floor low without reducing the pump efficiency. It is an object of the present invention to provide a vertical shaft pump that can reduce vibration and noise of the apparatus and that is easy to maintain.

  The present invention is a pumping pipe extending in the vertical direction and having a suction port on the lower end side, a main shaft extending in the vertical direction in the pumping pipe and having an impeller fixed on the lower end side, and disposed on the upper end side of the pumping pipe. In a vertical shaft pump comprising a discharge elbow, a straight pipe hanging pipe fixed to an installation floor, connected to the discharge elbow on the upper end side, and connected to the upper end side of the pumping pipe on the lower end side, A first part built in the suspension pipe, and a second part penetrating the pipe wall of the suspension pipe, one end connected to the first part and the other end arranged outside the suspension pipe And a casing having a third portion disposed outside the suspension tube and connected to the other end of the second portion, while an upper end side is disposed in the first portion, The lower end side is located outside the casing and the upper end of the main shaft An output shaft connected in the vertical direction, and an input shaft extending in the horizontal direction, one end of which is disposed in the third portion and the other end is located outside the casing and connected to the prime mover. A speed reducer provided in the casing and provided with a power transmission mechanism for transmitting rotation input to the input shaft from the prime mover side to the output shaft, and disposed in the pumping pipe so as to surround the main shaft. A first bearing for supporting the main shaft, the side being connected to the lower end of the first part of the casing of the speed reducer and communicating with the inside of the casing of the speed reducer, the lower end being sealed in a liquid-tight state, and the speed reducer A protective tube that accommodates a second bearing that supports the output shaft of the first reduction gear chamber and that forms a first lubricating oil chamber filled with the first lubricating oil together with the inside of the first portion of the reduction gear, and an upper end Is the speed reducer A lubricating oil circulation path having a lower end connected to the lower end side of the protective tube, and a main shaft or an output shaft, the lower end side of the lubricating oil circulation path extending from the upper end side to the lower end side. There is provided a vertical shaft pump comprising: a lubricating oil circulation mechanism that raises the first lubricating oil chamber and generates a lubricating oil flow that returns to the upper end side of the lubricating oil circulation path.

  The first bearing that supports the main shaft and the second bearing that supports the main shaft of the speed reducer are arranged in the first lubricating oil chamber in which the first lubricating oil is circulated by the lubricating oil circulation path and the lubricating oil circulation mechanism. Has been. Therefore, the allowable load of the bearing is increased and the reliability is improved, and the present invention can be applied to a case where dry operation or pumping is seawater.

  The casing of the speed reducer has a first part built in the suspension pipe, a second part penetrating the suspension pipe, and a third part 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.

  Furthermore, the casing of the speed reduction device is disposed on the suspension pipe fixed to the installation floor, and the speed reduction device is closer to the installation floor than when the speed reduction device casing is disposed on the discharge elbow. 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.

  Furthermore, the first portion of the casing of the speed reducer is disposed 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 relative to the cross-sectional area of the pumping pipe, specifically, by setting these cross-sectional areas to be equal, Loss can be reduced.

  Specifically, an upper chamber and a lower chamber partitioned by a partition are formed inside the first portion of the casing, and the lower chamber houses the second bearing and the first lubricating oil. The upper chamber constitutes a second lubricating oil chamber filled with the second lubricating oil together with the inside of the second part and the third part of the casing.

  Deformed according to the differential pressure between the pressure of the first lubricating oil in the first lubricating oil chamber and the static pressure of the pumping pipe, the suspension pipe, and the pumping flow path in the discharge elbow, It is preferable to further include an automatic pressure adjusting device that changes the volume of the first lubricating oil chamber so that the pressure of the first lubricating oil becomes equal to the static pressure in the flow path.

  By providing this automatic pressure regulating device, it is possible to prevent the first lubricating oil from leaking into the flow path due to the pressure difference between the first lubricating oil chamber and the pumping water flow path. Further, it is possible to prevent moisture from entering from the flow path into the first lubricating oil chamber due to this pressure difference.

  The first lubricating oil filled in the first lubricating oil chamber is preferably a biodegradable lubricating oil.

  If a biodegradable lubricating oil is used as the first lubricating oil, the first lubricating oil flows promptly even when the first lubricating oil leaks from the first lubricating oil chamber to the flow path. Since it decomposes into the pumping water of the road, it is possible to minimize the influence on the environment due to the leakage of the first lubricating oil.

  In the vertical shaft pump of the present invention, the first bearing that supports the main shaft and the second bearing that supports the main shaft of the speed reducer are such that the first lubricating oil is lubricated by the lubricating oil circulation path and the lubricating oil circulation mechanism. Since it is arranged in one lubricating oil chamber, the allowable load of the bearing is increased and the reliability is improved, and the present invention can be applied to a case where dry operation or pumping is seawater.

  The casing of the speed reducer has a first part built in the suspension pipe, a second part penetrating the suspension pipe, and a third part arranged outside the suspension pipe. Therefore, the uppermost part of the casing of the reduction gear can be set to a height below the uppermost part of the discharge elbow, the height of the vertical pump from the installation floor can be kept low, and the prime mover is provided separately from the installation floor. There is no need to install a floor, nor is it necessary to install a prime mover on a large, high pedestal installed on the installation floor.

  Furthermore, compared with the case where the casing of the speed reducer is arranged on the discharge elbow, the speed reducer is arranged close to the installation floor, and the first part of the casing of the speed reducer is built in the suspension pipe. The vibration and noise generated by the speed reducer during operation of the vertical shaft pump can be reduced.

  Furthermore, since the first part of the casing of the speed reducer is arranged not in the discharge elbow where the water flow is changed from the vertical direction to the horizontal direction, but in the straight tubular suspension pipe, the pressure in the discharge elbow Loss can be reduced and pump efficiency can be increased.

  By providing the automatic pressure regulator, it is possible to prevent leakage of lubricating oil from the casing of the speed reducer to the flow path in the suspension pipe and intrusion of moisture from the flow path in the suspension pipe into the casing.

  By adopting a biodegradable lubricating oil as the first lubricating oil, the influence on the environment due to the outflow of the lubricating oil can be minimized.

  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 through a hanging pipe 9 which will be described in detail 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 bearings (first bearings) 12 </ b> A and 12 </ b> B that are slide bearings such as a cutless bearing and a ceramic bearing. 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.

  A bearing 12 </ b> A on the lower end side of the main shaft 11 is attached to a holder 103 </ b> A in a frame 102 having both ends opened connected to the front end side of the guide vane 101. On the other hand, the bearing 12 </ b> B on the upper end side of the main shaft 11 is attached to a holder 103 </ b> B fixed to the pumping pipe 6.

  The suspension pipe 9 is a straight tube with both ends open, and includes a flange 9a to which a discharge elbow 10 is fixed at the upper end, and a flange 9b for suspending the pumped water pipe 6 to the lower end side. A base plate 9c for fixing to the installation floor 4 is integrally provided outside the lower flange 9b. A through hole 4 a for inserting the pump casing 2 is formed in the installation floor 4. The base plate 9c is fixed to the installation floor 4 in the vicinity of the hole edge of the through hole 4a. The pumping pipe 6 fixed to the flange 9 b of the hanging pipe 9 is inserted into the through hole 4 a and extends toward the bottom of the water tank 3. In FIG. 2, 9d is a bolt hole for inserting a bolt (not shown) for connection with the pumping pipe 6 provided in the flange 9b, and 9e is for fixing to the installation floor 4 provided in the base plate 9c. This is a bolt hole through which a bolt (not shown) 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 speed reduction device 16 for decelerating and transmitting the rotation of the output shaft of the prime mover to the main shaft 11 and converting the direction of the rotation shaft from the horizontal direction to the vertical direction. In other words, the speed reducer 16 also functions as a converter in the driving force transmission direction.

  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 hemispherical shell-like portions at both upper and lower ends of a cylindrical portion extending in the vertical direction. The first portion 18 is arranged so that the axis of the cylindrical portion 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 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 protrude until the discharge elbow 10 is curved 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 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 9a 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 reduction device 16 extends in the vertical direction, the upper end is disposed in the first portion 18 of the casing 17, and the lower end protrudes downward from the first portion 18 and is located in the pumped water pipe 6. 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 by a bearing (second underwater bearing) 12C which is a slide bearing such as a cutless ceramic bearing, and is positioned in the thrust direction by a hollow shaft 22 and a ball bearing 23A.

  The interior of the first portion 18 of the casing 17 of the speed reducer 16 is partitioned into an upper chamber 18b and a lower chamber 18c by a partition wall 18a. The output shaft 21 extends downward through the partition wall 18a. A shaft seal device 24A is attached to a portion of the partition wall 18a through which the output shaft 21 passes, and the upper chamber 18b and the lower chamber 18c are partitioned from each other in a liquid-tight state. In the upper chamber 18b, in addition to the hollow shaft 22 and the ball bearing 23, bevel gears 29A and 29B described later are accommodated. On the other hand, the bearing 12C is accommodated in the lower chamber 18c.

  The input shaft 26 of the speed reducer 16 extends in the horizontal direction and is rotatably supported by two ball bearings 23B and 23C 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 seal device 24B 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 decelerates the rotation input to the input shaft 26 from the prime mover and transmits it to the output shaft 21 is a pair of spur gears 27A and 27B, an intermediate shaft 28, and a pair of bevel gears 29A and 29B. It is comprised by. 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 23D in the third portion 20 of the casing 17 and two ball bearings 23E and 23F 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.

  Protective pipes 104A and 104B surrounding the main shaft 11 and the output shaft 21 with a space therebetween are arranged in the pumping pipe 6. The lower protective tube 104A has a lower end attached to the upper end of the frame 102 in a liquid-tight state, and an upper end attached to the lower end of the holder 103B in a liquid-tight state. The upper protective tube 104B has a lower end attached to the upper end of the holder 103B in a liquid-tight state, and an upper end attached to the lower end of the first portion 18 of the casing 17 of the speed reducer 16 in a liquid-tight state. An opening 18d is formed at the lower end of the first portion 18 of the casing 17, and the lower chamber 18c in the first portion 18 communicates with the inside of the protective tubes 104A and 104B. On the other hand, the lower end side of the protective tube 104A is sealed in a liquid-tight state by a shaft sealing measure 24C attached to the lower end of the holder 103A.

  A first lubricating oil chamber 110A is formed by the inside of the protective tubes 104A and 104B and the lower chamber 18c of the first portion 18 of the casing 17 of the speed reducer 16. On the other hand, the second lubricating oil chamber 110 </ b> B is formed by the upper chamber 18 b in the first portion 18 of the casing 17 of the speed reducer 16 and the inside of the second portion 19 and the third portion 20 of the casing 17. Yes. The first lubricating oil chamber 110A and the second lubricating oil chamber 110B are partitioned in a liquid-tight state by a shaft seal device 24A.

  The first lubricating chamber 110A is filled with biodegradable lubricating oil (first lubricating oil). Examples of the biodegradable lubricating oil include synthetic ester biodegradable oil and polyester plant biodegradable oil. On the other hand, the second lubricating chamber 110B is filled with normal lubricating oil that is not biodegradable (second lubricating oil). An example of normal lubricating oil is turbine oil.

  The upper end side is connected to the lower chamber 18b of the first portion 18 of the casing 17 of the speed reducer 16, while the lower end is the lower end side of the protective tube 104A (the region between the shaft seal device 24C inside the holder 13A and the bearing 12A). ) Is connected to a lubricating oil pipe line (lubricating oil circulation path) 105. The lubricating oil pipe 105 is provided with an opening / closing valve 37 and an oil filter 137 at a portion located above the installation floor 4. The lubricating oil conduit 105 is also filled with the same biodegradable lubricating oil as the first 110A.

  A vane (lubricating oil circulation mechanism) 108 is provided in the vicinity of the connection portion between the protective tube 103 </ b> B of the output shaft 21 and the casing 16. The blades 108 may be provided on the main shaft 11. The blades 108 rotate with the rotation of the main shaft 11 and the output shaft 21 during operation of the vertical shaft pump 1. The rotation of the blades 108 causes the biodegradable lubricating oil to circulate in the first lubricating oil chamber 110A. Specifically, the rotation of the blades 108 causes the lubricating oil conduit 105 to flow from the upper end side to the lower end side, into the first lubricating oil chamber 110A below the bearing 12A, and further to the first lubricating oil chamber 110A. And a lubricating oil flow is generated that returns to the upper end side of the lubricating oil pipe line 105 through the bearings 12A to 12C.

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

  First, the bearings 12 </ b> A to 12 </ b> C are disposed in the first lubricating oil chamber 110 </ b> A in which the first lubricating oil is circulated by the lubricating oil conduit 105 and the blades 108. Therefore, the allowable load of the bearings 12A to 12C increases and the reliability increases, and the present invention can be applied to a case where dry operation or pumping is seawater.

  In addition, 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.

  Next, the casing 17 of the speed reducer 16 is arranged on the suspension pipe 9 fixed to the installation floor 4. Compared with the case where the casing of the speed reducer is arranged on the discharge elbow 10, the speed reducer 16 is installed on the installation floor 4. It is arranged close to. 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.

  Furthermore, the first portion 18 of the casing 17 of the speed reducer 16 is arranged in the straight tubular suspension pipe 9 rather than in the discharge elbow 10 in which the direction of the flow of the pumped water is bent from the vertical direction to the horizontal direction. Has been. 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.

  Furthermore, since the first lubricating oil chamber 110A and the lubricating oil conduit 105 are filled with biodegradable lubricating oil, the lubricating oil from the lubricating oil conduit 1057 first lubricating oil chamber 110A to the water tank 3 and the flow path is used. Even when leakage occurs, the biodegradable lubricating oil is quickly decomposed into the pumped water in the flow path, and the environmental impact caused by the leakage of the lubricating oil can be reduced to a minimum.

  An automatic pressure adjusting device 33A is provided for maintaining the pressure of the biodegradable lubricating oil in the first lubricating oil chamber 110A equal to the static pressure of the flow path in the suspension pipe 9. The automatic pressure adjusting device 33A includes a pressure introducing pipe having both ends opened and a bellows (variable member) having one end opened and the other end closed. One end of the pressure introducing pipe passes through the upper portion of the first portion 18 of the casing 17 and is attached to the through hole so that the first lubricating oil chamber 110 </ b> A communicates with the flow path in the suspension pipe 9. An open end of a bellows is attached to the other end of the pressure introducing pipe. Bellows is a cylinder made of metal, etc., with pressure applied from the inside to form a plurality of annular protrusions at intervals, but a thin and corrugated annular plate is alternately connected between the inner and outer edges. It may be formed together.

  The pressure of the lubricating oil in the first space 31A acts on one side (left side in the figure) of the closed end of the bellows. Moreover, the static pressure of the flow path in the suspension pipe 9 acts on the other side (right side in the figure) of the closed end of the bellows via the pressure introduction pipe. 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 connected to one end of the pressure introducing pipe is provided in the cylindrical portion of the first portion 18 of the casing 17, and the opening is orthogonal to the water flow direction in the flow path in the hanging pipe 9. ing. 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 in balance, when the pressure of the lubricating oil is changed to a state higher than the static pressure of the flow path, the bellows contracts by an amount corresponding to the differential pressure. The volume of the oil chamber 110A increases. As a result, the pressure of the lubricating oil in the first lubricating oil chamber 110A 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 other hand, 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 extends by an amount corresponding to the magnitude of the differential pressure. Therefore, the volume of the first lubricating oil chamber 110A is reduced. As a result, the pressure of the lubricating oil in the first lubricating oil chamber 110A 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. In this way, the automatic pressure adjusting device 33A can maintain a state in which the pressure of the biodegradable lubricating oil in the first lubricating oil chamber 110A is balanced with the static pressure of the flow path. Therefore, leakage of the lubricating oil from the first lubricating oil chamber 110A 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. Further, it is possible to prevent moisture from entering the first lubricating oil chamber 110A 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).

  In order to automatically adjust the pressure in the second lubricating oil chamber 110B, an automatic pressure adjusting device 33B having the same structure as the above-described automatic pressure adjusting device 33A is provided. The automatic pressure adjusting device 33B includes a pressure introducing pipe having both ends opened and a bellows (variable member) having one end opened and the other end closed. One end of the pressure introducing pipe penetrates the lower portion of the cylindrical portion on the upper side of the first portion 18 of the casing 17 and makes the second lubricating oil chamber 110B and the flow path in the suspension pipe 9 communicate with each other. It is attached to the hole. A differential pressure between the pressure of the lubricating oil in the second lubricating oil chamber 110B and the static pressure of the flow path acts on the closed end of the bellows, and the bellows 35 expands and contracts accordingly, whereby the second lubricating oil chamber 110B. It is possible to maintain a state in which the pressure of the lubricating oil inside and the static pressure of the flow path are balanced. Thereby, leakage of the lubricating oil from the second lubricating oil chamber 110B to the pumping water flow path and the intrusion of moisture from the pumping water flow path to the second lubricating oil chamber 110B can be prevented.

(Second Embodiment)
FIG. 3 shows a vertical shaft pump 1 according to a second embodiment of the present invention. In the present embodiment, the structure of the suspension tube 9 is different from the first embodiment. Specifically, the base plate 9 c is provided integrally with the upper flange 9 a of the suspension pipe 9. The suspension pipe 9 itself is inserted into the through hole 4 a of the installation floor 4 and extends toward the bottom of the water tank 3.

  Further, in the present embodiment, a power transmission mechanism that transmits the rotation input from the prime mover to the input shaft 26 to the output shaft 21 is different from the first embodiment. 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. 42 A of 1st intermediate shafts are accommodated in the 3rd part 20 of the casing 17, and are rotatably supported by the two ball bearings 23G and 23H. 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 42B is rotatably supported by ball bearings 23I and 23J 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.

  In addition, other configurations of the second embodiment except that one end of the pressure introducing pipe of the automatic pressure adjusting device 33A is connected to the through hole of the upper hemispherical shell portion of the first portion 18 of the casing 17 and The operation is the same as in 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 lubricating oil chamber 110A and the second lubricating oil chamber 110B at all times or at regular time intervals is provided, thereby causing wear and failure of various bearings and the like. The presence or absence of may be monitored. Moreover, this invention is not limited to a vertical shaft pump, It can apply also to a horizontal shaft pump.

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 longitudinal cross-sectional view which shows the vertical shaft pump concerning 2nd Embodiment of this invention.

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, 9e Bolt hole 10 Discharge elbow 10a Discharge port 11 Main shaft 12A , 12B, 12C Bearing 13 Impeller 14 Coupling 16 Reduction gear 17 Casing 18 First part 18a Cylindrical part 18b, 18c Hemispherical shell part 18d, 18e Through hole 19 Second part 20 Third part 21 Output shaft 22 hollow shaft 23A to 23K ball bearing 24A to 24C shaft seal device 26 input shaft 27A, 27B spur gear 28, 42A, 42B intermediate shaft 29A, 29B, 41A to 41F bevel gear 31A first space 31B second space 33A, 33B Automatic pressure regulator 37 Gate valve 5 0,51 Channel cross-sectional area

Claims (4)

A pumping pipe extending in the vertical direction and having a suction port on the lower end side, a main shaft extending in the vertical direction in the pumping pipe and having an impeller fixed on the lower end side, and a discharge elbow disposed on the upper end side of the pumping pipe In a vertical shaft pump comprising:
A straight pipe hanging pipe fixed to the installation floor, connected to the discharge elbow at the upper end side, and connected to the upper end side of the pumping pipe at the lower end side;
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, a third portion disposed outside the suspension pipe and connected to the other end of the second portion, and one having an upper end side disposed in the first portion A vertically extending output shaft having a lower end located outside the casing and connected to an upper end of the main shaft, and one end disposed in the third portion and the other end located outside the casing. And a horizontally extending input shaft connected to the prime mover side, and a power transmission mechanism that is disposed in the casing and transmits the rotation input to the input shaft from the prime mover side to the output shaft. When,
It is arranged in the pumping pipe so as to surround the main shaft, the upper end side is connected to the lower end of the first part of the casing of the speed reducer and communicates with the inside of the casing of the speed reducer, and the lower end side is sealed in a liquid-tight state. The first lubricating oil chamber in which the first bearing for supporting the main shaft and the second bearing for supporting the output shaft of the speed reducer are accommodated and filled with the first lubricating oil is disposed in the speed reducer. A protective tube formed with the interior of the first portion;
A lubricating oil circulation path having an upper end connected to the first portion of the casing of the speed reducer and a lower end connected to the lower end side of the protective tube;
Provided in the main shaft or the output shaft, and generating a lubricating oil flow that rises from the upper end side of the lubricating oil circulation path through the lower end side and then returns to the upper end side of the lubricating oil circulation path. A lubricating oil circulation mechanism;
A vertical shaft pump comprising: An upper chamber and a lower chamber partitioned by a partition are formed inside the first portion of the casing,
The lower chamber houses the second bearing and constitutes a part of the first lubricating oil chamber,
The said upper chamber comprises the 2nd lubricating oil chamber with which the 2nd lubricating oil was filled with the inside of the 2nd part and the 3rd part of the said casing, It is characterized by the above-mentioned. Vertical shaft pump.   Deformed according to the differential pressure between the pressure of the first lubricating oil in the first lubricating oil chamber and the static pressure of the pumping pipe, the suspension pipe, and the pumping flow path in the discharge elbow, The automatic pressure control device for changing the volume of the first lubricating oil chamber so that the pressure of the first lubricating oil becomes equal to the static pressure in the flow path is further provided. Item 3. The vertical shaft pump according to item 2.   The vertical pump according to any one of claims 1 to 3, wherein the first lubricating oil filled in the first lubricating oil chamber is a biodegradable lubricating oil.

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