JP2008128188A - Vertical shaft pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a height of a vertical shaft pump having a structure wherein a discharge pipe is connected in a half way of a pumping pipe, and a straightening plate for curving a direction of a water flow is arranged in the connection part. <P>SOLUTION: The vertical shaft pump 1 is provided with the discharge pipe 11 branching in a horizontal direction at the half way of a lower pumping pipe 6 perpendicularly extending. The straightening plate 22 guiding the water flow from a suction port 7a in such a manner that the direction is converted to the horizontal direction to the discharge pipe 11 is housed in a section where the discharge pipe 11 in the lower pumping pipe 6 is connected. A rotating direction conversion device 25 converts rotation output from a prime mover from the horizontal direction to the perpendicular direction so as to transmit the rotation to a main shaft 10. A part of a bottom part 27a of a housing 26 of the rotating direction conversion device 25 closes an upper end opening 5a of an upper pumping pipe 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vertical shaft pump.

  A so-called pull-out type vertical shaft pump is known in which the main shaft and the impeller can be pulled out and taken out with the pumping pipe fixed to the installation floor (see Non-Patent Document 1, for example). On the other hand, in order to reduce the height of the vertical shaft pump and enable it to be driven by a horizontal shaft prime mover, a structure in which a speed reducer that also functions as a rotation direction conversion device is integrally provided on the top of the discharge elbow, There has been proposed a structure in which this type of reduction gear is disposed (see, for example, Patent Documents 1 and 2). A pulling-type vertical shaft pump is connected to the discharge pipe (discharge pipe) in the middle of the pumping pipe, and the flow of water (pumped water) is bent from the vertical direction to the horizontal direction by a rectifying plate built in this connection part. There are things. Since this type of vertical pump does not have a discharge elbow in the first place, the structure for reducing the height as described in Patent Documents 1 and 2 is not suitable.

Japanese Patent No. 3306749 Japanese Patent No. 3623155 Igor J. Karassik, 3 others, "Pump Handbook" 2nd edition, USA, McGRAW-HILL BOOK COMPANY, 1986, p2.100

  The present invention is a vertical shaft pump having a structure in which a discharge pipe is connected in the middle of a pumping pipe, and a rectifying plate for curving the direction of water flow is arranged at this connection portion, and can be driven by a horizontal axis motor with a reduced height. The task is to do.

  The present invention includes a pumping pipe extending in a vertical direction in which a suction port opening in a water tank is disposed on a lower end side, a main shaft extending in a vertical direction in the pumping pipe and having an impeller fixed on a lower end side, and the pumping water A discharge pipe that branches in the horizontal direction from the middle of the pipe, and a part where the discharge pipe of the pumping pipe branches, and the direction of the water flow from the water intake port is directed from the vertical direction to the discharge pipe. A vertical shaft pump comprising: a rectifying plate that guides the motor to be converted; and a rotation direction conversion device that converts the rotation output from the prime mover from a horizontal direction to a vertical direction and transmits the rotation direction to the main shaft. Has a housing in which at least a part of the bottom portion closes the upper end opening of the pumped water pipe located above the rectifying plate, and extends horizontally, and one end is located outside the housing and connected to the prime mover side. The other end An input shaft positioned in the wing, and a power transmission mechanism disposed in the housing and transmitting the rotation input to the input shaft from the prime mover side to the main shaft by changing the rotation direction from a horizontal direction to a vertical direction. A vertical shaft pump is provided.

  The housing is detachable from the pumping pipe, and the upper end of the main shaft is located in the housing of the rotation direction changing device and is connected to the input shaft by the power transmission mechanism, and is vertically connected to the pumping pipe. It is preferable to include an inner casing that extends in the direction and has an upper end connected to the bottom of the rotation direction changing housing, rotatably accommodates the main shaft, and has the current plate attached thereto.

  At least a part of the bottom portion of the housing of the rotation direction conversion device that converts the rotation output from the prime mover from the horizontal direction to the vertical direction has a structure that closes the upper end opening of the pumping pipe located above the current plate, The rotation direction changing device is arranged on the upper side of the pipe without interposing a space or a member. If the vertical pump has a structure in which the discharge pipe branches laterally from the middle of the pumping pipe, this structure can be adopted regardless of whether the discharge pipe is a cast product or a can structure of a rolled plate. Drive by horizontal axis motor can be realized by reducing the height of the pump.

  In addition, since the housing of the rotation direction changing device has a structure in which the bottom portion closes the upper end opening of the pumping pipe above the branching portion of the rectifying plate and the discharge pipe, the flow from the pumping pipe to the discharge pipe is not hindered, and the pressure While the loss can be reduced, the bottom of the housing is always in contact with the water near the upper end opening of the pumping pipe, so that the power transmission mechanism, lubricating oil, etc. accommodated in the housing can be effectively cooled.

  By adopting a pull-out type in which the inner casing is connected to the housing of the apparatus, the speed reducer, the main shaft, the impeller, and the current plate can be removed from the pumping pipe at a time.

(First embodiment)
FIG. 1 shows a vertical pump 1 according to a first embodiment of the present invention. The vertical shaft pump 1 includes an outer casing 3 that constitutes a flow path of water pumped from a water tank 2 and an inner casing 4 that is detachably disposed in the outer casing 3.

  The outer casing 3 is a bell mouth 7 having a straight tubular upper and lower pumping pipes 5, 6 both extending in the vertical direction, and a suction port 7 a that is connected to the lower end of the lower pumping pipe 6 and opens into the water tank 2. Is provided. An annular base plate 8 is interposed at a connecting portion between the upper pumping pipe 5 and the lower pumping pipe 6, and the base plate 8 is fixed to the installation floor 9 above the water tank 2. Specifically, the installation floor 9 is provided with a through hole 9a for allowing the outer casing 3 of the vertical shaft pump 1 to pass therethrough, and the base plate 8 is fixed to the installation floor 9 in the vicinity of the hole edge of the through hole 9a. A discharge pipe 11 branching in the horizontal direction is connected to the lower pumping pipe 6 located below the installation floor 9.

  The inner casing 4 includes a shaft casing 12, a vane casing 13 connected to the lower side of the shaft casing 12, and a cover casing 14 surrounding the lower end portion of the vane casing 13, and covers the periphery of the main shaft 10 extending in the vertical direction. . The upper end of the shaft casing 12 is connected to a bottom portion 27a of the housing 26 of the rotation direction conversion device 25 described later. A bearing 15 for rotatably supporting the main shaft 10 is disposed between the lower end of the shaft casing 12 and the upper end of the vane casing 13. A bearing 16 for rotatably supporting the main shaft 10 is also disposed in the vane casing 13. An impeller 18 is fixed to the lower end of the main shaft 10 located at the lower end opening of the vane casing 13. A base end side of a fixed guide vane 19 is fixed to a portion of the vane casing 13 above the impeller 18. The distal end side of the guide vane 19 surrounds the impeller 18 and has both upper and lower ends. A cover casing 14 having an opening is fixed.

  An end plate 21 is attached to the lower end opening of the lower pumping pipe 6. The end plate 21 is provided with a mortar-shaped through-hole 21a extending upward. On the lower surface of the end plate 21, the upper end of the bell mouth 7 is fixed to the periphery of the through hole 21a. Moreover, the lower end of the cover casing 14 is arrange | positioned in the watertight state at the hole wall of the through-hole 21a, and the lower end opening of the suction inlet 7a and the cover casing 14 is mutually connected.

  In the part where the discharge pipe 11 in the lower pumping pipe 6 is branched, the rectifying plate guides the water flow from the suction port 7a so that the direction of the water flow is changed from the vertical direction to the horizontal direction toward the discharge pipe 11. 22 is built-in. The rectifying plate 22 is fixed to the shaft casing 12 which is a part of the inner casing 4. The area below the rectifying plate 22 in the lower pumping pipe 6 is an area (flow path area 23) functioning as a flow path through which the water flow from the suction port 7a toward the discharge pipe 11 flows. 6 is a region in which water stays without substantially participating in the water flow from the suction port 7a to the discharge pipe 11 in the region above the rectifying plate 22 in the inside 6 and all the regions in the upper pumping pipe 5 ( This is the staying area 24).

  An unillustrated prime mover (horizontal axis prime mover) is disposed on the installation floor 9, and the output shaft of the prime mover extends in the horizontal direction. The vertical shaft pump 1 includes a rotation direction conversion device 25 that converts the rotation of the output shaft of the prime mover from the horizontal direction to the vertical direction and transmits it to the main shaft 10.

  A housing 26 of the rotation direction changing device 25 includes a main body 27 having a closed end (bottom 27a) on the lower side and an opening at an upper end, a lid body 28 for closing the opening of the main body 27, and between the main body 27 and the lid body 28. And a support plate 29 interposed therebetween, and the inside is filled with lubricating oil. The housing 26 of the rotation direction changing device 25 is detachably attached to the upper pumping pipe 5. Specifically, the housing 26 of the rotation direction changing device 25 detachably closes the upper end opening 5a of the upper pumping pipe 5 located above the current plate 22 (facing the staying region 24). More specifically, an annular plate 31 is fixed to the upper end of the upper pumping pipe 5 with bolts, and a part of the bottom 27a of the housing 26 is fixed so as to close the central opening of the plate 31. Yes. If the bolting of the plate 31 is released, the housing 26 of the rotation direction changing device 25 can be removed from the upper pumping pipe 5.

  The upper end side of the main shaft 10 extends from the outside of the housing 26 to the inside through the bottom 27 a of the housing 26. A shaft sealing device 32 for sealing the inside of the housing 26 against the staying region 24 is provided at a portion of the bottom portion 27a of the housing 26 through which the main shaft 10 passes. Further, the housing 26 accommodates bearings 33 and 34 that support the main shaft 10 in the radial direction and the thrust direction, respectively.

  An input shaft 35 of the rotation direction conversion device 25 extends in the horizontal direction and is rotatably supported by bearings 36 and 37 in the housing 26. One end (right end in the figure) of the input shaft 35 is disposed in the housing 26, and the other end (left end in the figure) is disposed outside the housing 26. The other end of the input shaft 35 is connected to the prime mover side as described above.

  A housing 26 of the rotation direction conversion device 25 accommodates a power transmission mechanism 38 that converts rotation input to the input shaft from the prime mover side from the horizontal direction to the vertical direction and transmits it to the main shaft 10. The power transmission mechanism 38 also has a function of shifting the rotation of the output shaft of the prime mover and transmitting it to the main shaft 10. In other words, the rotation direction conversion device 25 also functions as a transmission.

  The power transmission mechanism 38 in the present embodiment includes two intermediate shafts 41 and 42 that extend in the vertical direction, a pair of bevel gears 43 and 44, and three spur gears 45, 46, and 47, respectively. One intermediate shaft 41 is supported at the upper end side by a bearing 48 attached to the support plate 29, and at the lower end side by a bearing 49 attached to a support portion 27 b provided near the bottom portion 27 a of the main body 27. The other intermediate shaft 42 is supported by a bearing 42 attached to the support plate 29. A bevel gear 43 is fixed to one end of the input shaft 35. A bevel gear 44 that meshes with the bevel gear 43 is fixed to the intermediate shaft 41. The spur gear 45 fixed to the upper end side of the intermediate shaft 41 meshes with a spur gear 46 fixed to the upper end of the adjacent intermediate shaft 42. The spur gear 46 meshes with a spur gear 47 fixed to the main shaft 10. The rotation of the output shaft of the prime mover input to the input shaft 35 is transmitted to the main shaft 10 via the bevel gear 43, bevel gear 44, intermediate shaft 41, spur gear 45, spur gear 46 (intermediate shaft 42), and spur gear 47. Is done. During this time, the direction of the rotation center is changed from the horizontal direction to the vertical direction, and the rotation speed is reduced. Deceleration is realized by the gear ratio of the bevel gears 43 and 44 and the spur gears 45 to 47.

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

  First, the main shaft 10 can be pulled out from the outer casing 3. Specifically, if the fixing of the plate 31 to the upper end of the upper pumping pipe 5 is released and the housing 26 of the rotation direction changing device 25 is lifted upward away from the installation floor 9, the inner casing 4 (shaft casing 12, The vane casing 13 and the cover casing 14) can be pulled out from the upper end opening 5a of the upper pumping pipe 5, and the main shaft 10 and the impeller 18 fixed to the lower end thereof can be pulled out from the upper end opening 5a together with the inner casing 4. it can. Thus, since the vertical shaft pump 1 of this embodiment is a pull-out type, maintenance and repair are easy.

  Next, the bottom 27a of the housing 26 of the rotation direction conversion device 25 that converts the rotation output from the prime mover from the horizontal direction to the vertical direction closes the upper end opening 5a of the upper pumping pipe 5 positioned above the rectifying plate 22. It is a structure. In other words, the rotation direction changing device 25 is arranged above the upper pumping pipe 5 without interposing a space or a member. As a result, the height of the vertical shaft pump 1 can be reduced, and a horizontal shaft prime mover can be used.

  Further, the bottom 27a of the housing 26 of the rotation direction changing device 25 closes the upper end opening 5a of the upper pumping pipe 5 located above the connecting portion of the rectifying plate 22 and the discharge pipe 11 (in the staying region 24). . In other words, the housing 26 of the rotation direction changing device 25 is not disposed in the flow path region 23 that forms the flow path to the discharge pipe 11. Therefore, the housing 26 of the rotation direction changing device 25 does not hinder the flow of water from the lower pumping pipe 6 to the discharge pipe 11 and can reduce pressure loss. On the other hand, the bottom 27a of the housing 26 of the rotation direction changing device 25 is always in contact with water in the vicinity of the upper end opening 5a of the upper pumping pipe 5 (the stay region 24), so that the power transmission mechanism 38 accommodated in the housing 26 is effectively used. Can be cooled.

(Second Embodiment)
In the vertical shaft pump 1 according to the second embodiment of the present invention shown in FIG. 2, a discharge pipe 11 that branches in a horizontal direction is connected to an upper pumping pipe 5 that is located above the installation floor 9, and the upper pumping water A rectifying plate 22 is built in the portion of the pipe 5 where the discharge pipe 11 is branched. Therefore, in the upper pumping pipe 5, the staying area 24 is from the rectifying plate 22 to the upper opening 5 a, and in the upper pumping pipe 5, the area below the rectifying plate 22 and all the areas in the lower pumping pipe 6. Is the flow path region 23.

  Since other configurations and operations of the second embodiment are the same as those of the first embodiment, 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, in order to reduce the height of the vertical shaft pump 1, the upper end opening 5 a of the upper pumping pipe 5 is closed at the bottom portion 27 a of the housing 26 of the rotation direction conversion device 25 by being positioned above the rectifying plate 22 (retention region 24). The above-described structure is not limited to the drawing-type vertical shaft pump as in the embodiment, and any vertical shaft pump having a structure in which the discharge pipe branches laterally from the middle of the pumping pipe can be adopted. In this respect, the present invention is not limited to the pulling die but can be applied to a vertical shaft pump that is not a pulling die. In addition, this structure can be adopted regardless of whether the discharge pipe is a cast product or a can structure of a rolled plate.

  In the above-described embodiment, only a part of the bottom 27a of the housing 26 of the rotation direction changing device 25 is configured to close the upper end opening 5a of the upper pumping pipe 5, but the upper end of the upper pumping pipe 5 is entirely formed by the bottom 27a. The opening 5 a may be closed, and the entire outside of the bottom portion 27 a may be brought into contact with the water in the staying region 24.

Sectional drawing which shows the vertical shaft pump concerning 1st Embodiment of this invention. Sectional drawing which shows the vertical shaft pump concerning 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vertical shaft pump 2 Water tank 3 Outer casing 4 Inner casing 5 Upper pumping pipe 5a Upper end opening 6 Lower pumping pipe 7 Bell mouth 7a Suction port 8 Base plate 9 Installation floor 9a Through hole 10 Main shaft 11 Discharge pipe 12 Shaft casing 13 Vane casing 14 Cover Casing 15, 16, 33, 34, 36, 37, 48, 49, 50 Bearing 18 Impeller 19 Guide vane 21 End plate 21 a Through hole 22 Rectifier plate 23 Flow path region 24 Retention region 25 Rotational direction conversion device 26 Housing 27 Main body 27a Bottom portion 27b Support portion 28 Cover body 29 Support plate 31 Plate 32 Shaft seal device 35 Input shaft 38 Power transmission mechanism 41, 42 Intermediate shaft 43, 44 Bevel gear 45, 46, 47 Spur gear 52, 53 Recess

Claims (2)

A pumping pipe extending in the longitudinal direction in which a suction port opening in the water tank is disposed 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;
A discharge pipe branched laterally from the middle of the pumping pipe;
A rectifying plate that is built in the branch of the discharge pipe of the pumping pipe and guides the water flow from the water suction port so that the direction of the water flow is changed from the vertical direction to the horizontal direction toward the discharge pipe;
A vertical shaft pump comprising: a rotation direction conversion device that converts a rotation direction output from a prime mover from a horizontal direction to a vertical direction and transmits the rotation direction to the main shaft;
The rotation direction changing device is:
A housing in which at least a part of the bottom part closes an upper end opening of the pumped water pipe located above the current plate;
An input shaft extending in the horizontal direction, having one end positioned outside the housing and connected to the prime mover side, and the other end positioned in the housing;
A vertical shaft comprising: a power transmission mechanism disposed in the housing and configured to convert the rotation input to the input shaft from the prime mover side from a horizontal direction to a vertical direction and transmit the rotation direction to the main shaft. pump. The housing is detachable from the pumping pipe,
An upper end of the main shaft is located in the housing of the rotation direction conversion device and is connected to the input shaft by the power transmission mechanism,
It is provided with an inner casing that extends in the vertical direction in the pumping pipe and has an upper end connected to the bottom of the rotation direction changing housing, rotatably accommodates the main shaft, and has the current plate attached thereto. The vertical shaft pump according to claim 1.

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