JP5642120B2 - Vertical shaft pump and water-resistant motor - Google Patents

Description

  The present invention relates to a vertical shaft pump and a water-resistant motor mounted on the pump.

  The vertical shaft pump includes a pumping pipe that is piped so as to extend in the vertical direction in the suction water tank, and a bend pipe that is connected to an upper end of the pumping pipe. In the bend pipe, the upward water flow from the pumping pipe is changed to the horizontal direction and fed to the discharge pipe connected to the downstream side. In addition, a rotating shaft connected to the driving means passes through the bend pipe. The rotating shaft is connected to a main shaft disposed in the pumping pipe, and an impeller for pumping water is fixed to the lower end side of the main shaft. Such a vertical shaft pump is described in Patent Document 1.

  However, in the vertical shaft pump of Patent Document 1, a motor base is provided so as to surround the bend pipe, and a motor and a speed reducer that constitute driving means are installed on the motor base. If it flows, the drive means may be submerged. And when a drive means is submerged, since it is necessary to carry out disassembly maintenance, there exists a problem that a long time is required for recovery.

  There is also a pump facility in which a vertical pipe bend pipe is installed on the first installation floor, a second installation floor is provided above the first installation floor, and a driving means is installed on the second installation floor. Are known. However, in this case, there is a problem that the construction cost increases.

Japanese Patent Laid-Open No. 11-159491

  An object of the present invention is to provide a vertical shaft pump and a water-resistant motor for the pump that can continue operation even when submerged.

First, a water-resistant motor for a pump includes a motor casing in which an output shaft connected to a main shaft of the pump is disposed, and a cooling unit provided outside the motor casing, and is formed on a bend pipe of the pump. A water-resistant motor that is integrally attached in a watertight state so as to cover the opening, and that is cooled by pumped water pumped from a suction water tank, and has a hollow shaft-shaped motor that matches the axis of the pumped pipe in the motor casing A holding mechanism for disposing the output shaft on the motor shaft so as to be movable in the axial direction and fixing the output shaft to the upper end of the output shaft so as not to move at a predetermined position; It is provided.

The vertical shaft pump of the present invention has a pumping pipe that extends in the vertical direction in the suction water tank, has a suction port at the lower end, and has a main shaft with an impeller attached to the lower end side, and one end is the upper end of the pumping pipe. And a bend pipe whose other end is connected to a discharge pipe extending in a substantially horizontal direction and whose upper side portion is opened along the axial direction of the pumping pipe, and an output shaft connected to the main shaft. The motor casing and a cooling portion provided outside the motor casing are integrally attached in a watertight state so as to cover the opening of the bend pipe , and the temperature is lowered by pumping water drawn from the suction water tank. And a water resistant motor.

  This vertical shaft pump has a water-proof motor placed in a watertight state on the opening of the bend pipe, so that the water in the suction tank is surely discharged without leaking outside from the opening of the bend pipe during normal operation. Water can be sent downstream from the pipe. Moreover, even if unexpected water flows into the building and the motor is submerged, it can be operated immediately without disassembly. Furthermore, since the output shaft of the water-resistant motor is directly connected to the main shaft of the pump and the drive mechanism can be integrated into one pump chamber, the equipment can be simplified and the construction cost can be suppressed.

In this vertical shaft pump, a hollow motor shaft having an axial center coinciding with the axis of the pumping pipe is disposed in the motor casing of the water resistant motor, and the output shaft can be moved along the axial direction of the motor shaft. And a holding mechanism for fixing and holding the output shaft at a predetermined position so as not to move. If it does in this way, when assembling a vertical shaft on-site, the clearance adjustment between the impeller fixed to the lower end side and the opposing part can be performed easily. Therefore, the workability regarding installation can be greatly improved.

  Moreover, it is preferable that the cooling unit is configured such that a jacket is disposed outside the motor casing, and a medium space in which a cooling medium is enclosed is formed between the motor casing and the jacket. Thus, since the internal cooling type water-resistant motor is used, it can cool more efficiently than natural heat radiation.

Furthermore, a heat exchanger that partitions the motor casing and the bend pipe and cools the cooling medium in the medium space is provided on the opening side of the bend pipe in the water-resistant motor, and pumps water to the discharge pipe side. It is preferable that the cooling medium in the medium space is cooled.
Alternatively, any one of the pumping pipe, the discharge pipe, and the bend pipe is provided with a heat exchanger that cools the cooling medium in the medium space, and the medium space is cooled by pumping water to the discharge pipe side. It is preferable that the medium is cooled.
In this way, external equipment for cooling the water-resistant motor is not necessary, so that the pump equipment can be simplified. Alternatively, since the pumping water is not used as a cooling medium, the jacket can be prevented from being blocked by foreign matter, and the reliability can be improved.

  Furthermore, a fixing member for fixing the pumping pipe in the suction water tank is disposed, and the bend pipe is fixed to an installation floor on the upper side of the suction water tank, and the upper end of the pumping pipe and the bend pipe are It is preferable to provide a fitting connection portion that is fitted and connected to one end so as to be movable along the axial direction of the pumping pipe. When installing this vertical shaft pump, the pumping pipe is disposed in the suction water tank and fixed by a fixing member. Thereafter, one end of the bend pipe is fitted to the upper end of the pumped water pipe, and the bend pipe is fixed to the installation floor. At this time, an error in the height dimension of the suction water tank and the installation floor can be absorbed by moving the bend pipe in the axial direction of the pumping pipe. Therefore, the adjustment work of the error is unnecessary at the time of installation, so that the installation workability can be improved. And since this vertical shaft pump can distribute | distribute a load to a suction water tank and an installation floor, it can reduce the intensity | strength requested | required of a machine.

  Since the vertical shaft pump of the present invention uses a water-resistant motor, even when unexpected water flows into the building and the motor is submerged, it can be operated immediately without being disassembled. Further, since the output shaft of the water-resistant motor is directly connected to the main shaft of the pump and the drive mechanism can be integrated into one pump chamber, the equipment can be simplified and the construction cost can be suppressed.

It is sectional drawing which shows the pump installation using the vertical shaft pump of 1st Embodiment which concerns on this invention. It is an expanded sectional view of the impeller part of FIG. It is an expanded sectional view of the motor part of FIG. (A), (B) is an expanded sectional view which shows the adjustment state of the clearance gap between a protect liner and an impeller. It is sectional drawing which shows the pump installation using the vertical shaft pump of 2nd Embodiment. It is an expanded sectional view of the impeller part of FIG. It is an expanded sectional view of the motor part of FIG. It is sectional drawing which shows the 1st installation process of the vertical shaft pump of 2nd Embodiment. It is sectional drawing which shows the 2nd installation process of a vertical shaft pump. (A), (B) is an expanded sectional view which shows the adjustment state of the clearance gap between a protector pipe | tube and an impeller. It is a partial expanded sectional view which shows the vertical shaft pump of 3rd Embodiment. It is a partial expanded sectional view which shows the vertical shaft pump of 4th Embodiment. It is a partial expanded sectional view which shows the vertical shaft pump of 5th Embodiment. It is a partial expanded sectional view which shows the vertical shaft pump of 6th Embodiment. It is a partial expanded sectional view which shows the vertical shaft pump of 7th Embodiment. It is a partial expanded sectional view which shows the vertical shaft pump of 8th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a pump facility using a vertical shaft pump 10 according to a first embodiment of the present invention. The vertical shaft pump 10 includes a straight tubular casing 11, and a water-resistant motor 30 that can be continuously operated without being disassembled and maintained even when immersed in water.

  First, in a pump station where the vertical shaft pump 10 is installed, a suction water tank 1 for storing water such as rainwater flowing in from an inflow side conduit (not shown) is provided by placing concrete or the like. The upper part of the suction water tank 1 is covered with an installation floor 2. The installation floor 2 is provided at a predetermined interval from the bottom 1 a of the suction water tank 1, and the space above it constitutes the pump chamber 3. Further, the installation floor 2 is provided with a through hole 2a so as to be positioned in the vicinity of the downstream end portion in the water inflow direction to the suction water tank 1. Around this through hole 2a, a mounting portion 2b is provided that protrudes upward so as to form a cylindrical shape.

  The casing 11 of the vertical shaft pump 10 according to the first embodiment is fixed to the installation portion 2b in a state of being inserted into the through hole 2a of the installation floor 2 from above. The casing 11 includes a pumping pipe 12 that hangs downward from the through hole 2a, and a bend pipe 21 that is fixed to the installation portion 2b.

  The pumping pipe 12 is piped so as to extend in the vertical direction in the suction water tank 1, and is composed of a suction bell mouth 13, a vane casing 14, and intermediate joint pipes 18A and 18B. As shown in FIG. 2, the suction bell mouth 13 has a substantially conical cylinder shape whose diameter is gradually expanded downward. The suction port 13 a formed by the lower end opening of the suction bell mouth 13 is disposed to face the bottom portion 1 a of the suction water tank 1 at a predetermined distance. The vane casing 14 has a cylindrical shape and is water-tightly connected to the upper end of the suction bell mouth 13. A plurality of ribs 14a projecting inward so as to form a radial shape are provided inside the vane casing 14, and a bearing casing 15 is integrally provided at the inner end of the rib 14a. A sleeve 16 is disposed inside the bearing casing 15, and ceramic bearings 17A and 17B are disposed at upper and lower ends thereof. The intermediate joint pipe 18 </ b> A has a conical cylindrical shape and is water-tightly connected to the upper end of the vane casing 14. As shown in FIG. 1, the intermediate joint pipe 18B has a cylindrical shape and is watertightly connected to the upper end of the intermediate joint pipe 18A. A plurality of ribs 18a projecting inward are provided inside the intermediate joint pipe 18B. A bearing casing 19 is integrally provided at the inner end of the rib 18a. A ceramic bearing 20 is provided in the bearing casing 19. It is arranged. In addition, the pumping pipe 12 is not limited to this structure, For example, intermediate joint pipe 18A, 18B may be comprised by one straight pipe, and may be comprised by three or more straight pipes.

  As shown in FIG. 1, the bend pipe 21 changes the vertical water flow through the pumping pipe 12 into the horizontal direction and discharges it to the downstream side. The bend pipe 21 includes a fixing intermediate joint pipe 22 and a deliver 24. Yes. The fixing intermediate joint pipe 22 has a cylindrical shape with a short overall axial length, and a lower end (one end of the bend pipe 21) is water-tightly connected to an upper end of the intermediate joint pipe 18B (upper end of the pumping pipe 12). At the upper end of the fixing intermediate joint pipe 22, a base plate 23 for fixing to the upper end of the installation portion 2 b of the installation floor 2 is projected outward in the radial direction. The deliver 24 is bent 90 degrees from the vertical direction to the horizontal direction, and its lower end is connected to the upper end of the fixing intermediate joint tube 22 in a watertight manner. The delivery 24 is provided with an opening 25 for allowing the output shaft 38 </ b> A of the water-resistant motor 30 to penetrate the upper portion (outer peripheral portion) along the axial direction of the water pump 12. Further, the deliver 24 is provided with a motor mounting portion 26 having a cylindrical shape coaxial with the axis of the pumped water pipe 12 on the outer edge of the opening 25. Further, a discharge pipe 28 having a valve 27 is connected to the upper end of the deliver 24 (the other end of the bend pipe 21). The bend pipe 21 is not limited to this configuration, and for example, the fixing intermediate joint pipe 22 and the deliver 24 may be integrally provided.

  A water resistant motor 30 is attached to the motor attaching portion 26 of the derivent 24 so as to cover the upper end opening thereof in a watertight manner. As shown in FIG. 3, the water resistant motor 30 includes a cylindrical motor casing 31 extending in the vertical direction. The motor casing 31 is filled with air (dry type), and a motor shaft 33 is disposed on an axis that coincides with the axis of the water pumping pipe 12. The motor shaft 33 has a hollow shape, and hollow support shafts 34A and 34B are connected to the upper and lower sides thereof. The upper support shaft 34 </ b> A is rotatably supported by a bearing 35 </ b> A disposed on a casing cover 32 that covers the upper portion of the motor casing 31, and the lower support shaft 34 </ b> B is disposed on a box upper portion 46 that covers the lower portion of the motor casing 31. It is rotatably supported by the provided bearing 35B. Further, inside the motor casing 31, a rotor 36 is fixed to the motor shaft 33, and a stator 37 is disposed on the outer periphery of the rotor 36.

  An output shaft 38A is disposed on the motor shaft 33 so as to be movable along the axial direction. The output shaft 38 </ b> A extends through the upper end of the motor casing 31, and the upper end of the output shaft 38 </ b> A is connected to the support shaft 34 </ b> A by a coupling 39. The coupling 39 includes a lower joint 39A connected to the support shaft 34A, and an upper joint 39B connected to the lower joint 39A. The output shaft 38A is formed with an insertion groove 38a that extends in the radial direction and extends in the axial direction. By passing the rod through the upper joint 39B and the insertion groove 38a, the coupling 39 (support shaft 34A) and the output shaft 38A Are non-rotatably connected. In addition, a shaft nut 40 that is screwed into a screw portion formed at the upper end of the output shaft 38A is disposed on the upper portion of the coupling 39. By the rotation of the shaft nut 40, the moving distance of the output shaft 38A can be finely adjusted and fixedly held at a predetermined position so as not to move (holding mechanism). The coupling 39 and the shaft nut 40 and thus the inside of the motor are watertightly covered by a cover 41 disposed on the upper portion of the motor casing 31.

  The lower end side of the output shaft 38A passes through the opening 25 of the bend pipe 21 and extends into the deliver 24, and a separate main shaft 38B is integrally connected (directly connected) to the lower end thereof by the shaft coupling 42. Yes. That is, in the present embodiment, one output shaft is configured by directly connecting the output shaft 38A and the main shaft 38B. As shown in FIG. 1, the main shaft 38 </ b> B is rotatably supported by ceramic bearings 17 </ b> A, 17 </ b> B, and 20, and an impeller 43 is attached to a lower end penetrating the bearing casing 15. A protect liner 44 is disposed on the inner peripheral portion of the suction bell mouth 13 where the outer edge of the blade 43a of the impeller 43 is in sliding contact.

  As shown in FIG. 3, an oil chamber 45 in which lubricating oil is enclosed is formed in the lower portion of the motor casing 31. The oil chamber 45 is defined by a box upper portion 46 disposed at the lower portion of the motor casing 31 and a box lower portion 47 that blocks the lower end opening of the box upper portion 46. In the lower part of the oil chamber 45, a cooling chamber 48 in which primary cooling water as a cooling medium is enclosed is further formed. The cooling chamber 48 is partitioned by disposing and sealing a heat exchanger 49 having a substantially disk shape at the lower end opening of the box lower portion 47. The heat exchanger 49 has a large number of heat transfer fins formed by bending, and the outer peripheral portion thereof is watertightly connected to the upper end opening of the motor mounting portion 26 of the bend pipe 21. In the oil chamber 45, a mechanical seal 50A for sealing between the air in the motor casing 31 and the lubricating oil in the oil chamber 45 and between the lubricating oil and the primary cooling water in the cooling chamber 48 is disposed. Has been. Further, in the cooling chamber 48, a mechanical seal 50 </ b> B that performs a seal between the primary cooling water and the pumped water pumped through the pumping pipe 12 is disposed.

  A cylindrical water jacket 51 is disposed as a cooling part on the outer periphery of the motor casing 31 so as to surround the motor casing 31 with a predetermined interval. The upper end of the water jacket 51 is sealed with the casing cover 32. Thereby, a cylindrical medium space 52 is formed between the motor casing 31 and the water jacket 51. The medium space 52 is connected to the cooling chamber 48 by a cooling water outlet pipe 53 and a cooling water inlet pipe 54. Further, a circulation blade 55 for circulating the primary cooling water is attached to a portion of the lower support shaft 34B of the motor shaft 33 located in the cooling chamber 48.

  When the vertical shaft pump 10 is installed in the pump station, for example, the output shaft 38A and the main shaft 38B are integrally connected, and the pumping pipe 12, the bend pipe 21, and the water-resistant motor 30 are integrally assembled. The pumping pipe 12 is passed through the through hole 2a from above the installation floor 2. And the base plate 23 of the bend pipe | tube 21 is fixed to the installation part 2b.

  When the output shaft 38A, the main shaft 38B, and the impeller 43 are assembled, the output shaft 38A and the main shaft 38B are moved in the axial direction by rotating the shaft nut 40, as shown in FIGS. 4 (A) and 4 (B). The gap between the protect liner 44 and the impeller 43 is adjusted. As described above, the vertical shaft pump 10 of the present embodiment can easily adjust the clearance of the impeller 43 fixed to the lower end side in the pump chamber 3 where the water-resistant motor 30 is located. Can be improved.

  When the vertical shaft pump 10 is operated, the impeller 43 is rotated through the motor shaft 33 and the shafts 38A and 38B directly connected to the stator 37 by driving the water-resistant motor 30 to rotate the rotor 36 relative to the stator 37. The Thereby, the water in the suction water tank 1 is pumped up through the pumping pipe 12 and is sent to the downstream side through the discharge pipe 28. At this time, in this embodiment, the opening portion 25 is provided in the bend pipe 21, but since the water-resistant motor 30 is disposed in a watertight state on the motor mounting portion 26 provided on the bend pipe 21, the pumped water leaks to the outside. Therefore, it is possible to reliably feed water from the discharge pipe 28 to the downstream side. Further, since the output shaft 38 </ b> A is passed through the hollow motor shaft 33 and connected by the coupling 39, the pump thrust can be supported by the upper end of the water-resistant motor 30.

  Further, in the water resistant motor 30, the primary cooling water in the medium space 52 in the water jacket 51 flows into the cooling chamber 48 through the cooling water outlet pipe 53 due to the rotation of the circulation blade 55, and the upper surface side of the heat exchanger 49. Is then circulated and supplied to the medium space 52 via the cooling water inlet pipe 54. That is, the primary cooling water circulates between the medium space 52 in the water jacket 51 and the heat exchanger 49. On the other hand, part of the pumped water pumped up by the impeller 43 as described above flows into the motor mounting portion 26 from the opening 25 of the bend pipe 21 and is introduced to the lower surface side of the heat exchanger 49. Therefore, the heat generated by the water-resistant motor 30 is transmitted from the primary cooling water to the pumped water as the secondary cooling water in the heat exchanger 49, and as a result, the water-resistant motor 30 is always cooled by the cooled primary cooling water.

  Thus, since the vertical shaft pump 10 of the present invention uses the water resistant motor 30, even if the pump chamber 3 is submerged, it can be continuously operated without disassembling the water resistant motor 30. In addition, since the internally cooled water-resistant motor 30 is used, cooling can be performed more efficiently than natural heat dissipation.

  Further, since the output shaft 38A of the water-resistant motor 30 is directly connected to the main shaft 38B and the drive mechanism can be integrated into one pump chamber 3, the facilities can be simplified and the construction cost can be suppressed. Furthermore, since the primary cooling water in the water-resistant motor 30 can be cooled through the heat exchanger 49 using the pumped water pumped up from the suction water tank 1 as the secondary cooling water, the external cooling water for cooling the water-resistant motor 30 is used. Equipment is not required, and pump equipment can be simplified. Alternatively, since the pumped water is not used as a cooling medium, the water jacket 51 can be prevented from being blocked by foreign matters, and the reliability can be improved.

(Second Embodiment)
FIG. 5 shows pump equipment using the vertical shaft pump 10 of the second embodiment. In the second embodiment, the pumping pipe 61 is fixed in the suction water tank 1 by the fixing member 75 and the bend pipe 69 is fixed to the installation floor 2, so that the load of the vertical shaft pump 10 is absorbed by the suction water tank 1 and the installation floor 2. The first embodiment is greatly different from the first embodiment in that it can be dispersed and the drive system components disposed inside these can be taken out.

  Specifically, the casing 60 of the vertical pump 10 of the second embodiment includes a pumping pipe 61 piped so as to extend in the vertical direction in the suction water tank 1, and a vertical water flow through the pumping pipe 61 in the horizontal direction. Instead, a bend pipe 69 that discharges to the downstream side and a fixing member 75 for standing the pumping pipe 61 in the suction water tank 1 are provided.

  The pumping pipe 61 includes a suction bell mouth 62, a vane casing 64, and intermediate joint pipes 66A to 66C. As shown in FIG. 6, the suction bell mouth 62 has a substantially conical cylindrical shape, and the suction port 62 a formed by the lower end opening thereof is disposed opposite to the bottom portion 1 a of the suction water tank 1 by a fixed member 75 with a predetermined distance therebetween. Has been. In the present embodiment, a protector tube 63 is disposed at a portion where the outer edge of the blade 80 a of the impeller 80 is in sliding contact, instead of the protect liner 44. The protector tube 63 has an inverted conical cylindrical shape, and its lower end is watertightly connected to the suction bell mouth 62. The vane casing 64 has a cylindrical shape and is watertightly connected to the upper end of the protector pipe 63. Inside the vane casing 64, a plurality of ribs 64a projecting inward so as to form a radial shape are provided. An engaging portion 65 for detachably assembling the bearing casing 83 is provided on the inner edge of the rib 64a so as to protrude inward. The intermediate joint pipe 66 </ b> A has a conical cylindrical shape and is water-tightly connected to the upper end of the vane casing 64. As shown in FIG. 5, the intermediate joint pipe 66B has a cylindrical shape and is watertightly connected to the upper end of the intermediate joint pipe 66A. The intermediate joint pipe 66C has a cylindrical shape and is watertightly connected to the upper end of the intermediate joint pipe 66B. As shown in FIG. 7, the upper end of the intermediate joint pipe 66 </ b> C (upper end of the pumping pipe 61) is a fitting connection portion 67 that is fitted and connected to the inside of one end of the bend pipe 69. A seal member 68 for sealing between the bend pipe 69 is disposed on the outer peripheral portion of the fitting connection portion 67.

  The bend pipe 69 includes a fixing intermediate joint pipe 70 and a deliver 73. The fixing intermediate joint pipe 70 has a cylindrical shape with a short overall axial length, and a base plate 71 for fixing to the upper end of the installation portion 2b of the installation floor 2 projects radially outward at the lower end thereof. Yes. The lower end of the fixing intermediate joint pipe 70 is provided with a fitting connection portion 72 bulging radially outward, and the fitting connection portion 72 is fitted outside the fitting connection portion 67 of the intermediate joint pipe 66C. Connected. The deliver 73 has an inverted L shape such that the second straight pipe portion 73b extending in the horizontal direction is joined to the first straight pipe portion 73a extending in the vertical direction. The lower end of the first straight pipe portion 73 a of the deliver 73 is connected to the upper end of the fixing intermediate joint pipe 70 in a watertight manner. Further, the upper end of the first straight pipe portion 73a of the deliver 73 is an opening 74 through which the output shaft 77A is penetrated and the water resistant motor 30 is attached in a watertight state. The end of the second straight pipe portion 73 b of the deliver 73 is connected to the discharge pipe 28 provided with the valve 27. The delivery 73 of the second embodiment has a configuration in which the opening 74 has a large opening area, and the opening 74 and the upper top of the second straight pipe portion 73b are positioned substantially flush with each other.

  The fixing member 75 is connected to the suction port 62a of the suction bell mouth 62 and the bottom 1a of the suction water tank 1 to fix the pumping pipe 12 in the suction water tank 1 so as to extend in the vertical direction. As shown in FIG. 6, the fixing member 75 includes a plurality of support columns 76 arranged at predetermined intervals in the circumferential direction on the outer peripheral edge of the lower end of the suction bell mouth 62.

  The water resistant motor 30 similar to the first embodiment is attached to the opening 74 of the casing 60 in a watertight state. In the present embodiment, as shown in FIG. 9, the main shafts 77 </ b> B and 77 </ b> C, which are drive system components, and the impeller 80 are integrally assembled with the output shaft 77 </ b> A of the water resistant motor 30. Specifically, an output shaft 77A is rotatably disposed in the water resistant motor 30. A separate first main shaft 77B is integrally connected to the output shaft 77A by a shaft coupling 78. A separate second main shaft 77C is integrally connected to the first main shaft 77B by a shaft coupling 79. An impeller 80 is connected to the lower end of the second main shaft 77C.

  The output shaft 77A and the main shafts 77B and 77C are covered with protective tubes 81A and 81B and a bearing casing 83. The protective tube 81 </ b> A is fixed to the lower portion of the water-resistant motor 30. A separate protective tube 81B is connected to the lower portion of the protective tube 81A via an intermediate bearing 82. The intermediate bearing 82 rotatably supports the first main shaft 77B located in the middle. A bearing casing 83 is connected to the lower part of the protective tube 81B. As shown in FIG. 6, the bearing casing 83 is provided with an engagement step portion 84 that engages with the engagement portion 65 of the vane casing 64. Further, underwater bearings 85A and 85B are disposed at the upper and lower ends of the bearing casing 83. These underwater bearings 85A and 85B rotatably support the second main shaft 77C located at the lower end. In the second main shaft 77C, an impeller 80 is connected to a portion protruding downward from the bearing casing 83.

  When installing the vertical shaft pump 10 in the pump station, for example, as shown in FIG. 8, the through-hole 2 a from above the installation floor 2 with the fixing member 75 integrally assembled to the lower end of the pumping pipe 61. The pumping pipe 61 is passed through. And the fixing member 75 is mounted on the bottom part 1a of the suction water tank 1, and the fixing member 75 is fixed to the bottom part 1a. Thereby, the pumping pipe 61 is erected in the vertical direction in the suction water tank 1.

  Next, the bend pipe 69 is arranged on the installation floor 2, and as shown in FIG. 9, the fixing intermediate joint pipe 70 is arranged on the installation section 2b of the installation floor 2, and the base plate 71 of the bend pipe 69 is installed in the installation section. Fix to 2b. At this time, conventionally, it has been necessary to adjust the error in the height dimension of the suction water tank 1 and the installation floor 2 by arranging spacers or the like. However, in this embodiment, the pumping pipe 61 and the bend pipe 69 are connected by fitting the fitting connection portions 67 and 72. Therefore, an error between the suction water tank 1 and the installation floor 2 can be absorbed by moving the bend pipe 69 in the axial direction with respect to the pumping pipe 61. Therefore, the adjustment work of the error is unnecessary at the time of installation, so that the installation workability can be improved.

  Next, the water-resistant pump 30 in which the main shafts 77 </ b> B and 77 </ b> C and the impeller 80 are integrally assembled is suspended and inserted into the water pump 61 from the opening 74. Then, the engaging step portion 84 of the bearing casing 83 is engaged with the engaging portion 65 of the vane casing 64. At this time, by rotating the shaft nut 40, the output shaft 77A and the main shafts 77B and 77C are moved in the axial direction, and as shown in FIGS. 10A and 10B, the impeller 80 and the suction bell mouth 62 (the protector tube) are moved. 63). Finally, the water resistant motor 30 is connected to the opening 74 of the bend pipe 69 in a watertight manner, and the cover 41 is attached to the upper side of the water resistant motor 30 in a watertight manner.

  When the vertical shaft pump 10 of the second embodiment is operated, the impeller 80 rotates via the directly connected output shaft 77A and main shafts 77B and 77C by driving the water-resistant motor 30, so that the water in the suction water tank 1 is pumped up. The water is pumped up through the pipe 61 and sent to the downstream side through the discharge pipe 28. And at the time of this driving | operation, the effect | action and effect similar to 1st Embodiment can be acquired.

  Moreover, the vertical pump 10 of the second embodiment fixes the pumping pipe 61 in the suction water tank 1 by the fixing member 75 and fixes the bend pipe 69 to the installation floor 2, so that the suction water tank 1 and the installation floor 2 are fixed. The load can be distributed. Therefore, the strength required for the installation floor 2 of the pump station can be reduced. In the present embodiment, only the main shafts 77B and 77C, the impeller 80, and the water-resistant pump 30 that are drive system components can be pulled up from the casing 60 (pull-out type). Therefore, when maintaining the impeller 80 which is a rotating body, it is not necessary to pull up the casing 60. Therefore, the lifting weight can be reduced, and the inspection workability can be improved.

(Third embodiment)
FIG. 11 shows the vertical shaft pump 10 of the third embodiment. The third embodiment is largely different from the first embodiment in that the configuration of the holding mechanism for fixing and holding the output shaft 38A at a predetermined position with respect to the motor casing 31 of the water resistant motor 30 is changed.

  Specifically, a spacer 90 is disposed between the upper and lower joints 39A and 39B in the coupling 39 of the third embodiment. The spacer 90 has a thickness along the axial direction of the output shaft 38 </ b> A set in accordance with a gap between the impeller 43 fixed to the lower end side of the main shaft 38 </ b> B and the suction bell mouth 13. In other words, a plurality of types of thick spacers 90 are prepared, and according to the gap between the impeller 43 and the suction bell mouth 13, the predetermined thickness spacer 90 is disposed between the joints 39A and 39B. Alternatively, a plurality of spacers 90 having the same thickness are prepared, and a predetermined number of spacers 90 are disposed between the joints 39A and 39B in accordance with the gap between the impeller 43 and the suction bell mouth 13.

  In the third embodiment configured as described above, the adjustment workability of the impeller 43 can be improved via the output shaft 38A and the main shaft 38B. Moreover, even if the pump chamber 3 is submerged, the same operations and effects as in the first embodiment can be obtained, such as being able to operate continuously without disassembling the waterproof motor 30. Of course, similarly to the second embodiment, it is also possible to fix the inside of the suction water tank 1 by the fixing member 75 and to be able to take out only the drive system components arranged inside.

(Fourth embodiment)
FIG. 12 shows a vertical shaft pump 10 according to the fourth embodiment. This fourth embodiment is different from the third embodiment in that a spacer 91 is provided between the bend pipe 21 and the water-resistant motor 30 instead of providing the spacer 90 on the coupling 39.

  Specifically, in the bend pipe 21 of the fourth embodiment, a spacer 91 is disposed in the opening 25 of the deliver 24, and a heat exchanger 49 is integrally assembled with the water-resistant motor 30 on the spacer 91. Are watertightly connected. As in the third embodiment, the spacer 91 has a thickness along the axial direction of the output shaft 38A set according to the gap between the impeller 43 fixed to the lower end side of the main shaft 38B and the suction bell mouth 13. . Thereby, the effect | action and effect similar to 3rd Embodiment can be acquired.

(Fifth embodiment)
FIG. 13 shows a vertical shaft pump 10 according to the fifth embodiment. This fifth embodiment is different from the third and fourth embodiments in that a split ring 92 is provided between the casing cover 32 and the coupling 39 instead of the spacers 90 and 91.

  Specifically, the support shafts 34A and 34B of the fifth embodiment are formed with long axial dimensions so that the motor shaft 33 can be moved along the axial direction of the output shaft 38A together. With the cover 41 and the coupling 39 not provided, a split ring 92 having a predetermined thickness is fitted on the support shaft 34A according to the clearance between the impeller 43 fixed to the lower end side of the main shaft 38B and the suction bell mouth 13. To do. Then, after connecting the lower joint 39A to the support shaft 34A, the upper joint 39B is connected to the lower joint 39A. Thereby, the clearance gap between the impeller 43 and the suction bell mouth 13 can be adjusted easily. Therefore, the same operation and effect as those of the third and fourth embodiments can be obtained.

(Sixth embodiment)
FIG. 14 shows a vertical shaft pump 10 according to the sixth embodiment. In the sixth embodiment, in order to cool the primary cooling water in the medium space 52, a separate heat exchange is used instead of the heat exchanger 49 having a large number of heat transfer fins arranged at the lower end of the water-resistant motor 30. It differs from each embodiment by the point arrange | positioned on the outer surface of the casing 11 using the container 94. FIG.

  Specifically, the cooling chamber 48 formed at the lower end of the heat-resistant motor 30 is closed by disposing a disc-shaped partition plate 93 at the lower end opening of the box lower portion 47, and the outer peripheral portion of the partition plate 93 is The bend pipe 21 is watertightly connected to the upper end opening of the motor mounting portion 26 of the bend pipe 21.

  A heat exchanger 94 is disposed on the outer surface of the motor mounting portion 26. The heat exchanger 94 is provided so as to be in contact with pumped water flowing inside by providing an insertion portion 26a in the motor attachment portion 26 and fitting into the insertion portion 26a. Inside the heat exchanger 94, a flow path through which the primary cooling water passes is partitioned and provided. Further, one end of the flow path is connected to the box lower portion 47 through the connection pipe 95A and communicates with the cooling chamber 48, and the other end is connected to the water jacket 51 through the connection pipe 95B and communicates with the medium space 52. Further, the cooling water outlet pipe 53 and the cooling chamber 48 in the medium space 52 are communicated with each other by a connection pipe 95C. The cooling water inlet pipe 54 that connects the inside of the cooling chamber 48 except the inside of the cooling water outlet pipe 53 and the medium space 52 is not provided.

  In the vertical shaft pump 10 of the sixth embodiment, when the water-resistant motor 30 is driven, the water in the suction water tank 1 is pumped through the pumping pipe 12 and is downstream via the discharge pipe 30 when the water resistant motor 30 is driven. Water is sent to Further, in the water resistant motor 31, the primary cooling water in the medium space 52 in the water jacket 51 flows into the cooling chamber 48 through the cooling water outlet pipe 53 and the connecting pipe 95C by the rotation of the circulation blade 55, and the connecting pipe 95A. And then flows into the heat exchanger 94. Thereafter, it passes through the heat exchanger 94 and is circulated and supplied to the medium space 52 through the connection pipe 95B. The primary cooling water is cooled through the partition plate 93 when passing through the cooling chamber 48 using the pumped water discharged from the pumping pipe 12 through the bend pipe 21 to the discharge pipe 28 as secondary cooling water. And when it passes through the heat exchanger 94, it is cooled.

  The vertical shaft pump 10 of the sixth embodiment configured as described above has the same operations and effects as the first embodiment, such as being capable of continuous operation without disassembling and maintaining the water-resistant motor 30 even if the pump chamber 3 is submerged. be able to. Of course, similarly to the second embodiment, it is also possible to fix the inside of the suction water tank 1 by the fixing member 75 and to be able to take out only the drive system components arranged inside. In addition, by using the spacers 90 and 91 or the split ring 92 as in the third to fifth embodiments, the adjustment workability of the impeller 43 can be improved via the output shaft 38A and the main shaft 38B.

(Seventh embodiment)
FIG. 15 shows a vertical shaft pump 10 according to the seventh embodiment. The seventh embodiment is different from the sixth embodiment in that the heat exchanger 94 is disposed on the upstream side of the valve 27 in the discharge pipe 28. Similarly to the sixth embodiment, the heat exchanger 94 is connected to the water-resistant motor 30 by connection pipes 95A and 95B. And in 7th Embodiment comprised in this way, compared with 6th Embodiment, although the arrangement structure of the heat exchanger 94 and the piping structure of connection pipe 95A, 95B become complicated, primary by secondary cooling water The cooling efficiency of the cooling water can be greatly improved.

(Eighth embodiment)
FIG. 16 shows the vertical shaft pump 10 of the eighth embodiment. The vertical shaft pump 10 of the eighth embodiment is a small one having a small drainage capacity, for example, and is different from each embodiment in that an air-cooled water-resistant motor 30 is used instead of the water-cooled water-resistant motor 30.

  Specifically, the water resistant motor 30 is not provided with a cooling mechanism such as the medium space 52 by the water jacket 51 as a cooling unit, the cooling chamber 48 by the box lower portion 47, the heat exchangers 49 and 94, and the circulation blade 55. Further, on the outside of the motor casing 31, instead of the water jacket 51, a heat sink 96 in which a plurality of fins project radially is disposed as a cooling unit.

  The vertical shaft pump 10 of the eighth embodiment configured as described above has the same operations and effects as the first embodiment, such as being capable of continuous operation without disassembling and maintaining the water-resistant motor 30 even if the pump chamber 3 is submerged. be able to. Of course, similarly to the second embodiment, it is also possible to fix the inside of the suction water tank 1 by the fixing member 75 and to be able to take out only the drive system components arranged inside. In addition, by using the spacers 90 and 91 or the split ring 92 as in the third to fifth embodiments, the adjustment workability of the impeller 43 can be improved via the output shaft 38A and the main shaft 38B.

  The vertical shaft pump 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

  For example, in the vertical shaft pump 10 of the first embodiment in which the bend pipe 21 is integrally connected to the pumping pipe 12, the fixing pipe 75 may be employed to fix the pumping pipe 12 to the suction water tank 1. Moreover, the fixing member 75 of 2nd Embodiment is not restricted to what is fixed to the bottom part 1a of the suction water tank 1, It is good also as a structure fixed to the side wall part of the suction water tank 1. FIG.

  Furthermore, in 1st-7th embodiment, it was set as the structure which encloses cooling water as a cooling medium in the medium space 52, However It is not restricted to water, It is good also as a structure which encloses media, such as an antifreeze liquid. Further, the medium is not limited to a liquid form, and any medium having fluidity may be used. Furthermore, in the water-resistant motor 30, the configuration of the holding mechanism for fixing and holding the output shaft at a predetermined position with respect to the motor casing 31 is not limited to the configuration of each of the above embodiments, and can be changed as desired. . The water-resistant motor 30 is not limited to the vertical shaft pump 10 and can also be applied to a horizontal shaft pump having a main shaft extending in the horizontal direction.

DESCRIPTION OF SYMBOLS 1 ... Suction water tank 2 ... Installation floor 10 ... Vertical shaft pump 11, 60 ... Casing 12, 61 ... Pumping pipe 13a, 62a ... Suction inlet 21, 69 ... Bend pipe 23, 71 ... Base plate 25, 74 ... Opening 28 ... Discharge pipe DESCRIPTION OF SYMBOLS 30 ... Water resistant motor 31 ... Motor casing 33 ... Motor shaft 38A, 77A ... Output shaft 38B, 77B, 77C ... Main shaft 40 ... Shaft nut (holding mechanism)
43, 80 ... Impeller 48 ... Cooling chamber 49 ... Heat exchanger 51 ... Water jacket (cooling part)
52 ... Medium space 67, 72 ... Fitting connection part 75 ... Fixing member

Claims (7)

A pumping pipe that extends in the vertical direction in the suction water tank, has a suction port at the lower end, and has a main shaft with an impeller attached to the lower end side;
One end is connected to the upper end of the pumping pipe, the other end is connected to a discharge pipe extending in a substantially horizontal direction, and a bend pipe whose upper side along the axial direction of the pumping pipe is opened,
A motor casing having an output shaft connected to the main shaft, and a cooling portion provided outside the motor casing, are integrally attached in a watertight state so as to cover the opening of the bend pipe. A water-resistant motor that is cooled by pumped water drawn from the suction water tank;
A vertical shaft pump comprising:   The motor casing of the water-resistant motor is provided with a hollow motor shaft having an axial center coinciding with the axis of the pumping pipe, and the output shaft is movably disposed along the axial direction on the motor shaft. 2. The vertical shaft pump according to claim 1, wherein a holding mechanism is provided at an upper end of the output shaft so that the output shaft is fixedly held at a predetermined position so as not to be movable.   2. The cooling unit according to claim 1, wherein a jacket is disposed outside the motor casing, and a medium space in which a cooling medium is enclosed is formed between the motor casing and the jacket. Or the vertical shaft pump of Claim 2.   A heat exchanger that partitions the motor casing and the bend pipe and cools the cooling medium in the medium space is provided on the opening side of the bend pipe in the water resistant motor, and the water is pumped to the discharge pipe to The vertical shaft pump according to claim 3, wherein the cooling medium in the medium space is cooled.   A heat exchanger for cooling the cooling medium in the medium space is provided in any one of the pumping pipe, the discharge pipe, and the bend pipe, and the cooling medium in the medium space is obtained by pumping water to the discharge pipe side. The vertical shaft pump according to claim 3, wherein the vertical shaft pump is cooled.   A fixing member for fixing the pumping pipe in the suction water tank is disposed, and the bend pipe is fixed to an installation floor on the upper side of the suction water tank, and the upper end of the pumping pipe and one end of the bend pipe are The vertical shaft pump according to any one of claims 1 to 5, further comprising a fitting connection portion that is fitted and connected so as to be movable along the axial direction of the pumping pipe. A motor casing having an output shaft connected to the main shaft of the pump, and a cooling portion provided outside the motor casing, are integrated in a watertight state so as to cover an opening formed in the bend pipe of the pump. Is a water-resistant motor that is attached to the pump and lowered by pumping water drawn from a suction tank ,
The motor casing is provided with a hollow motor shaft having an axial center coinciding with the axis of the pumping pipe, the output shaft is movably disposed along the axial direction on the motor shaft, and the output shaft A water-resistant motor characterized in that a holding mechanism for fixing and holding the output shaft at a predetermined position so as not to move is provided at an upper end of the water-proof motor.

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