JP5378476B2 - Vertical shaft pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distribute a load applied to a pumping station and to improve installation workability. <P>SOLUTION: A vertical shaft pump is configured such that it includes a lifting pipe 12 extended in a vertical direction in a suction water tank 1 and having a suction port 13a at its lower end, a fixing member 28 for fixing the lifting pipe 12 in the suction water tank 1, a bend pipe 20 having one end connected to an upper end of the lifting pipe 12 and other end connected to a discharge pipe 27 extended in a substantially horizontal direction, and fixed to an installation floor 2 on an upper side of the suction water tank 1, rotary shafts 51A to 51C arranged along an axis line in the lifting pipe 12 and having an impeller 54 attached to the lower end side, and a motor 30 disposed above the bend pipe 20 and rotating and driving the rotary shafts 51A to 51C, and at the upper end of the lifting pipe 12 and at one end of the bend pipe 20, fitting connection parts 18, 23 are provided which fit movably along the axial direction of the lifting pipe 12 to connect it. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a vertical shaft 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. Further, a rotating shaft connected to the driving means is passed through the bend pipe. This rotating shaft is penetrated from the upper side so as to coincide with the axis of the pumping pipe, and an impeller for pumping water is fixed to the lower end side thereof.

  In the vertical shaft pump of Patent Document 1, the bend pipe is fixed to the installation floor above the suction water tank, and the pumping pipe is fixed in the suction water tank by a fixing member. Thus, the load of the vertical shaft pump can be distributed to the installation floor and the wall surface of the suction water tank. Further, in this vertical shaft pump, drive system parts such as a motor, a rotating shaft and an impeller can be pulled up except for piping such as a pumping pipe and a bend pipe. As a result, workability such as overhaul of the pump can be improved.

  However, the vertical pump of Patent Document 1 has a problem that installation workability at the time of new construction is poor. Specifically, when constructing a machine place including a suction water tank and an installation floor, it is inevitable that an error occurs in the height dimension from the bottom of the suction water tank to the installation floor. For this reason, when the bend pipe is fixed to the installation floor after the bend pipe is connected to the pumping pipe fixed to the suction water tank, the gap formed between the base plate of the bend pipe and the installation floor is not constant. As a result, there is a problem that the installation workability is poor because an adjustment operation is required in which a spacer is disposed in the gap between the base plate of the bend pipe and the installation floor.

Japanese Patent Laid-Open No. 11-159491

  An object of the present invention is to provide a vertical shaft pump that can disperse the load applied to the machine field and improve the installation workability.

  In order to solve the above problems, the vertical pump of the present invention includes a pumping pipe that extends in the vertical direction in the suction water tank and has a suction port at a lower end, a fixing member that fixes the pumping pipe in the suction water tank, and one end thereof. A bend pipe connected to the upper end of the pumping pipe and having the other end connected to a discharge pipe extending in a substantially horizontal direction and fixed to the installation floor above the suction water tank, and arranged along the axis in the pumping pipe. A rotating shaft having an impeller attached to a lower end side, and a motor that is disposed above the bend pipe and rotationally drives the rotating shaft, the upper end of the pumped pipe and one end of the bend pipe, It is set as the structure which provided the fitting connection part which fits and connects so that a movement along the axial direction of a pumping pipe is possible.

  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. As described above, since an error adjustment operation is not required at the time of installation, 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 place.

  In this vertical shaft pump, it is preferable to provide an opening through which the rotary shaft can be taken out together with the impeller at the upper portion of the bend pipe along the axial direction of the pumped-up pipe. In this way, the drive means, the rotating shaft, and the impeller can be pulled up except for piping such as a pumping pipe and a bend pipe. Therefore, the weight of equipment that needs to be lifted can be reduced, and workability such as overhaul of the pump can be improved.

  A holding mechanism for movably disposing the rotating shaft along the axial direction with respect to the motor casing of the motor and fixing the rotating shaft so as not to move with respect to the motor casing at a predetermined position; It is preferable to provide it. If it does in this way, the clearance gap adjustment of the impeller fixed to the lower end side can be performed easily. Therefore, the workability regarding installation can be greatly improved.

  In the vertical shaft pump of the present invention, since the fitting connection is provided in the pumping pipe and the bend pipe, the error in the height dimension of the suction water tank and the installation floor is absorbed by moving the bend pipe in the axial direction of the pumping pipe. it can. 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 place.

It is sectional drawing which shows the pump installation using the vertical shaft pump of 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. It is sectional drawing which shows the 1st installation process of a vertical shaft pump. 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 suction bell mouth and an impeller.

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

  FIG. 1 shows pump equipment using a vertical shaft pump 10 according to an embodiment of the present invention. This vertical shaft pump 10 includes a straight tubular casing 11, and this casing 11 is fixed to both the suction water tank 1 and the installation floor 2 of the pump station.

  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 includes a pumping pipe 12 that is piped so as to extend in the vertical direction in the suction water tank 1, and a bend pipe that changes the vertical water flow through the pumping pipe 12 to the horizontal direction and discharges it downstream. 20 and a fixing member 28 for standing the pumping pipe 12 in the suction water tank 1.

  The pumping pipe 12 extends vertically downward from the through hole 2a of the installation floor 2 and is fixed by a fixing member 28, and is constituted by a suction bell mouth 13, a vane casing 15, and intermediate joint pipes 17A to 17C. As shown in FIG. 2, the suction bell mouth 13 has a substantially conical cylindrical shape gradually expanding in the downward direction, and a suction port 13 a having a lower end opening is predetermined with respect to the bottom 1 a of the suction water tank 1 by a fixing member 28. Are arranged opposite to each other with a distance of. In the present embodiment, the portion where the outer edge of the blade 54 a of the impeller 54 is in sliding contact is configured by a separate protector tube 14. The protector tube 14 has an inverted conical cylindrical shape, and its lower end is watertightly connected to the suction bell mouth 13. The vane casing 15 has a cylindrical shape and is watertightly connected to the upper end of the protector tube 14. Inside the vane casing 15, a plurality of ribs 15a projecting inward so as to form a radial shape are provided. On the inner edge of the rib 15a, an engaging portion 16 for detachably assembling the bearing casing 57 is provided so as to protrude inward. The intermediate joint pipe 17 </ b> A has a conical cylindrical shape and is water-tightly connected to the upper end of the vane casing 15. As shown in FIG. 1, the intermediate joint pipe 17B has a cylindrical shape, and is watertightly connected to the upper end of the intermediate joint pipe 17A. The intermediate joint pipe 17C has a cylindrical shape and is watertightly connected to the upper end of the intermediate joint pipe 17B. As shown in FIG. 3, the upper end of the intermediate joint pipe 17 </ b> C (the upper end of the pumping pipe 12) is a fitting connection portion 18 that is fitted and connected to the inner side of one end of the bend pipe 20. A seal member 19 for sealing between the bend pipe 20 and the bend pipe 20 is disposed on the outer peripheral portion of the fitting connection portion 18. In addition, the pumping pipe 12 is not limited to this structure, For example, you may comprise the intermediate joint pipes 17A-17C by one straight pipe.

  The bend pipe 20 is fixed to the installation portion 2 b of the installation floor 2, and includes a fixing intermediate joint pipe 21 and a deliver 24. The fixing intermediate joint pipe 21 has a cylindrical shape with a short overall axial length, and a base plate 22 for fixing to the upper end of the installation portion 2b of the installation floor 2 is projected radially outward at the lower end thereof. Yes. A fitting connection part 23 bulging radially outward is provided at the lower end of the fixing intermediate joint pipe 21 (one end of the bend pipe 20), and this fitting connection part 23 is a fitting connection of the intermediate joint pipe 17C. It is fitted and connected to the outside of the part 18. The deliver 24 has an inverted L shape such that the first straight pipe portion 24a extending in the vertical direction is joined to the second straight pipe portion 24b extending in the horizontal direction. The lower end of the first straight pipe portion 24 a of the deliver 24 is connected to the upper end of the fixing intermediate joint pipe 21 in a watertight manner. Further, the upper end of the first straight pipe portion 24a of the deliver 24 is an opening 25 through which the rotary shaft 51A is passed and the water resistant motor 30 is attached in a watertight state. A discharge pipe 27 is connected to the end of the second straight pipe portion 24b of the deliver 24 (the other end of the bend pipe 20) through a valve 26 that is normally closed and can be manually opened and closed. The bend pipe 20 is not limited to this structure, and for example, a fixing intermediate joint pipe 21 and a deliver 24 may be integrally provided.

  The fixing member 28 is connected to the suction port 13a of the suction bell mouth 13 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. 2, the fixing member 28 is provided with a plurality of support columns 29 disposed at predetermined intervals in the circumferential direction on the outer peripheral edge of the lower end of the suction bell mouth 13.

  A water resistant motor 30 is attached to the opening 25 of the casing 11 so as to be closed 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 32 is disposed on an axis that coincides with the axis of the water pumping pipe 12. The motor shaft 32 has a hollow shape, and hollow supporting shafts 33A and 33B are connected to the upper and lower sides thereof. The support shafts 33A and 33B are rotatably supported by bearings 34A and 34B disposed in the motor casing 31. Further, inside the motor casing 31, a rotor 35 is fixed to the motor shaft 32, and a stator 36 is disposed on the outer periphery of the rotor 35.

  On the motor shaft 32, a rotating shaft 51A is disposed so as to be movable along the axial direction. The rotating shaft 51 </ b> A extends through the upper end of the motor casing 31, and the upper end of the rotating shaft 51 </ b> A is connected to the support shaft 33 </ b> A by the coupling 37 so as not to rotate. A shaft nut 38 that is screwed into a screw portion formed at the upper end of the rotating shaft 51A is disposed on the upper portion of the coupling 37. By rotating the shaft nut 38, the rotary shaft 51A can be moved in the axial direction and fixedly held at a predetermined position so as not to move (holding mechanism). The coupling 37 and the shaft nut 38 are water-tightly closed by a cover 39 disposed on the motor casing 31.

  An oil chamber 40 in which lubricating oil is enclosed is formed in the lower part of the motor casing 31. The oil chamber 40 is defined by a box upper portion 41 disposed at the lower portion of the motor casing 31 and a box lower portion 42 that blocks the lower end opening of the box upper portion 41. A cooling water chamber 43 in which primary cooling water is sealed is further formed in the lower portion of the oil chamber 40. The cooling water chamber 43 is partitioned by disposing and sealing a heat exchanger 44 having a substantially disk shape at the lower end opening of the box lower portion 42. The heat exchanger 44 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 of the bend pipe 20. In the oil chamber 40, there is a mechanical seal 45 </ b> A that performs a seal between the air in the motor casing 31 and the lubricating oil in the oil chamber 40 and a seal between the lubricating oil and the primary cooling water in the cooling water chamber 43. Has been placed. In the cooling water chamber 43, a mechanical seal 45 </ b> B that seals between the primary cooling water and the pumped water pumped through the pumping pipe 12 is disposed.

  A cylindrical water jacket 46 is disposed on the outer periphery of the motor casing 31 so as to surround the motor casing 31 with a predetermined interval. Thereby, a cylindrical cooling water space 47 is formed between the motor casing 31 and the water jacket 46. The cooling water space 47 is connected to the cooling water chamber 43 by a cooling water outlet pipe 48 and a cooling water inlet pipe 49. Further, a circulation blade 50 for circulating the primary cooling water is attached to a portion of the motor shaft 32 located in the cooling water chamber 43.

  As shown in FIG. 5, rotating shafts 51 </ b> A to 51 </ b> C and an impeller 54, which are drive system components, are integrally assembled with the water resistant motor 30. Specifically, a rotating shaft 51 </ b> A is connected to the motor shaft 32 in the water resistant motor 30. A separate rotary shaft 51B is integrally connected (directly connected) to the rotary shaft 51A by a coupling 52. A separate rotary shaft 51C is integrally connected to the rotary shaft 51B by a coupling 53. And the impeller 54 is connected with the lower end of this rotating shaft 51C.

  The rotating shafts 51 </ b> A to 51 </ b> C are covered with rotating shaft protection tubes 55 </ b> A and 55 </ b> B and a bearing casing 57. The rotating shaft protection tube 55 </ b> A is fixed to the lower portion of the water-resistant motor 30. A separate rotary shaft protective tube 55B is connected to the lower portion of the rotary shaft protective tube 55A via an intermediate bearing 56. The intermediate bearing 56 rotatably supports the rotary shaft 51B located in the middle. A bearing casing 57 is connected to the lower portion of the rotating shaft protection tube 55B. As shown in FIG. 2, the bearing casing 57 is provided with an engagement step portion 58 that engages with the engagement portion 16 of the vane casing 15. Underwater bearings 59A and 59B are disposed at the upper and lower ends of the bearing casing 57. These underwater bearings 59A and 59B rotatably support a rotating shaft 51C located at the lower end. And the impeller 54 is connected with the part which protruded below from the bearing casing 57 in the rotating shaft 51C.

  When this vertical shaft pump 10 is installed in the pump station, for example, as shown in FIG. 4, the through-hole 2 a from above the installation floor 2 in a state where the fixing member 28 is integrally assembled to the lower end of the pumping pipe 12. The pumping pipe 12 is passed through. And the fixing member 28 is mounted on the bottom part 1a of the suction water tank 1, and the fixing member 28 is fixed to the bottom part 1a. Thereby, the pumping pipe 12 is erected in the vertical direction in the suction water tank 1.

  Next, the bend pipe 20 is arranged on the installation floor 2, and as shown in FIG. 5, the fixing intermediate joint pipe 21 is arranged on the installation section 2b of the installation floor 2, and the base plate 22 of the bend pipe 20 is installed on the installation section. Fix to 2b. At this time, in the present embodiment, since the pumping pipe 12 and the bend pipe 20 are connected by fitting the fitting connecting portions 18 and 23, an error in the height dimension between the suction water tank 1 and the installation floor 2 occurs. Can be absorbed by moving the bend pipe 20 in the axial direction relative to the pumping pipe 12. Therefore, the adjustment work of the error is unnecessary at the time of installation, so that the installation workability can be improved.

  Next, a water-resistant pump integrally assembled with the rotating shafts 51 </ b> A to 51 </ b> C and the impeller 54 is suspended and inserted into the pumped water pipe 12 through the opening 25. Then, the engaging step portion 58 of the bearing casing 57 is engaged with the engaging portion 16 of the vane casing 15. At this time, the rotating shafts 51A to 51C are moved in the axial direction by rotating the shaft nut 38, and as shown in FIGS. 6A and 6B, the impeller 54 and the suction bell mouth 13 (the protector tube 14) are moved. Adjust the gap. Finally, the water resistant motor 30 is connected to the opening 25 of the bend pipe 20 in a watertight manner, and a cover 39 is attached to the upper side of the water resistant motor 30 in a watertight manner. Thus, the vertical shaft pump 10 of the present embodiment can easily adjust the clearance of the impeller 54 fixed to the lower end side in the pump chamber 3 in which the water resistant motor 30 is located. Therefore, an important centering process is unnecessary in the pump installation work, and the workability related to the installation can be greatly improved.

  When the vertical shaft pump 10 is operated, the impeller 54 is rotated via the motor shaft 32 and the directly connected rotating shafts 51A to 51C by driving the water-resistant motor 30 to rotate the rotor 35 with respect to the stator 36. Is done. 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 27.

  At this time, in the present embodiment, the opening 25 is provided in the bend pipe 20, but since the water-resistant motor 30 is disposed in a watertight state on the bend pipe 20, the pumped water is reliably discharged without leaking outside. Water can be sent from the pipe 27 to the downstream side. Moreover, although the pumping pipe 12 and the bend pipe 20 are connected by fitting, since the upstream pumping pipe 12 is configured to be fitted into the downstream bend pipe 20, the pumped water is not leaked to the outside. It is possible to reliably feed water from the discharge pipe 27 to the downstream side. Furthermore, in this embodiment, since the rotary shaft 51 </ b> A passes through the hollow motor shaft 32 and is connected by the coupling 37, 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 cooling water space in the water jacket 46 flows into the cooling water chamber 43 through the cooling water outlet pipe 48 by the rotation of the circulation blade 50, and the upper surface of the heat exchanger 44. After being introduced to the side, it is circulated and supplied to the cooling water space 47 through the cooling water inlet pipe 49. That is, the primary cooling water circulates between the cooling water space 47 in the water jacket 46 and the heat exchanger 44. On the other hand, part of the pumped water pumped up by the impeller 54 as described above flows into the motor mounting portion from the opening 25 of the bend pipe 20 and is introduced to the lower surface side of the heat exchanger 44. Therefore, the heat generated in 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 44, and as a result, the water-resistant motor 30 is always cooled by the cooled primary cooling water.

  Thus, since the vertical pump 10 of the present invention uses the internal cooling type water-resistant motor 30, even if the pump chamber 3 is submerged, it can be continuously operated without disassembling the water-resistant motor 30.

  Moreover, since the water-resistant motor 30 can be directly connected to the rotating shafts 51A to 51C without using a reduction gear, and the drive mechanism can be integrated into one pump chamber 3, facilities can be simplified and an increase in construction cost can be suppressed. Furthermore, since the primary cooling water in the water-resistant motor 30 can be cooled through the heat exchanger 44 using the pumped water pumped up from the suction water tank 1 as the secondary cooling water, an external water injection mechanism is unnecessary, and the pump Equipment can be further simplified.

  In addition, since the vertical shaft pump 10 of the present embodiment fixes the pumping pipe 12 in the suction water tank 1 by the fixing member 28 and fixes the bend pipe 20 to the installation floor 2, the vertical pump 10 is attached to the suction water tank 1 and the installation floor 2. 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 rotating shafts 51A to 51C, the impeller 54, and the water-resistant pump that are drive system components can be pulled up from the casing 11 (pull-out type). Therefore, it is not necessary to pull up the casing 11 when maintaining the impeller 54 that is a rotating body. Therefore, the lifting weight can be reduced, and the inspection workability can be improved.

  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 said embodiment, although the fixing member 28 was fixed between the lower end of the pumping pipe 12 and 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. Moreover, in the said embodiment, although the water-proof motor 30 was used as a drive means, you may use a general purpose drive motor.

DESCRIPTION OF SYMBOLS 1 ... Suction water tank 2 ... Installation floor 10 ... Vertical shaft pump 11 ... Casing 12 ... Pumping pipe 13a ... Suction port 18 ... Fitting connection part 20 ... Bend pipe 22 ... Base plate 23 ... Fitting connection part 25 ... Opening part 27 ... Discharge pipe 28 ... Fixing member 30 ... Water resistant motor 32 ... Motor shaft 37 ... Coupling 38 ... Shaft nut (holding mechanism)
51A-51C ... rotating shaft 54 ... impeller

Claims (3)

A pumping pipe extending in the vertical direction in the suction tank and having a suction port at the lower end;
A fixing member for fixing the pumping pipe in the suction water tank;
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 fixed to the upper installation floor of the suction water tank;
A rotary shaft disposed along the axis in the pumping pipe and having an impeller attached to the lower end side;
A motor disposed above the bend pipe and driving the rotary shaft to rotate;
A vertical shaft pump characterized in that a fitting connection part is provided on the upper end of the pumping pipe and one end of the bend pipe so as to be fitted and connected so as to be movable along the axial direction of the pumping pipe.   The vertical shaft pump according to claim 1, wherein an opening that can take out the rotating shaft together with the impeller is provided in an upper portion of the bend pipe along an axial direction of the pumping pipe.   The rotating shaft is disposed so as to be movable along the axial direction with respect to the motor casing of the motor, and a holding mechanism is provided for fixing and holding the rotating shaft so as not to move with respect to the motor casing at a predetermined position. The vertical shaft pump according to claim 1 or 2, wherein the vertical shaft pump is provided.

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