JP4048046B2 - Vertical axis movable blade pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical shaft movable blade pump, and more particularly to a vertical shaft movable blade pump having a low protrusion height from a pump installation floor.
[0002]
[Prior art]
As a conventional vertical axis movable blade pump, for example, the one shown in FIG. 3 is known. The vertical shaft movable blade pump P includes a vertical main shaft 2 rotatably supported by a plurality of bearings 1, 1, an impeller 3 fixed to a lower end portion of the main shaft 2, and the impeller 3 can rotate freely. Is connected to the upper side of the discharge bowl 4, the vertical water pumping pipe 5 that houses the bearings 1, 1... And a discharge elbow (discharge pipe) 6 that is led through the main shaft 2 in a liquid-tight and rotatable manner, and is connected to the inside of the discharge bowl 4 and is provided with a suction bell 7 downward. A discharge valve 8 and a drain pipe 9 are connected downstream of the curved pipe 6. Further, the outlet of the drain pipe 9 faces the inside of the discharge water tank 10, and a flap valve 11 for preventing a back flow from the discharge water tank 10 to the drain pipe 9 is attached to this outlet.
[0003]
On the other hand, a blade angle operating rod 23 is inserted into the main shaft 2 so as to be simultaneously rotatable and freely movable in the axial direction, and the lower end portion of the blade angle operating rod 23 is movable, for example, by a ball joint and a cross head (not shown). It is connected to a plurality of blade shafts of the impeller 3 through a mechanism or an arm, and the upper end portion of the blade angle operation rod 23 is inserted into and connected to the inside of a blade angle operation mechanism 24 installed above the speed reducer 14. is there. Therefore, by moving the blade angle operation rod 23 in the axial direction of the main shaft 2 by operating the blade angle operation mechanism 24, the movable blade of the impeller 3 held at the reference blade angle of 0 degrees is closed (minus side). ) To reduce the amount of discharged water, or the movable blade of the impeller 3 held at the reference blade angle of 0 degrees can be rotated to the open side (plus side) to increase the amount of discharged water. .
[0004]
The vertical axis movable blade pump P having the above-described configuration is installed on the pump installation floor 12 of the drainage station. A pedestal 13 is erected on the pump installation floor 12, and a speed reducer 14 is installed on the pedestal 13, and a gantry 25 is erected on the upper side of the decelerator 14. 24 is supported. Further, the upper end portion of the main shaft 2 led to the upper side of the discharge curved pipe 6 is connected to the vertical output rotary shaft 16 of the speed reducer 14 via the coupling 15, and the horizontal input rotary shaft 17 of the speed reducer 14. Are coupled to a horizontal output rotary shaft 21 of a prime mover (for example, diesel engine) 20 via couplings 18 and 18 and an intermediate shaft 19. The prime mover 20 is installed on a prime mover base 22 erected on the pump installation floor 12.
[0005]
[Problems to be solved by the invention]
However, in the conventional vertical shaft movable blade pump P, the speed reducer 14 is installed on the mount 13 standing on the pump installation floor 12 of the drainage station, and is exposed above the discharge curved pipe 6. The blade angle operating mechanism 24 is supported by a gantry 25 erected on the upper side of 14, so that the height H 1 from the pump installation floor 12 to the top of the blade angle operation mechanism 24, that is, the vertical axis from the pump installation floor 12. The protrusion height H1 of the movable blade pump P is increased.
[0006]
This invention is made | formed in view of such a situation, and it aims at providing the vertical axis | shaft movable blade pump which made the protrusion height from a pump installation floor part low.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a vertical shaft movable blade pump according to the present invention includes a longitudinal main shaft rotatably supported by a bearing, an impeller fixed to the lower portion of the main shaft, and the impeller rotatably. An output of a prime mover, comprising: a housed discharge bowl; a vertical pumping pipe connected to the upper side of the discharge bowl and passing through the main shaft; and a discharge pipe connected to the upper side of the pumping pipe. The rotation is transmitted to the main shaft via the direction changer, and the blade angle operating rod that is simultaneously rotatable on the main shaft and is freely inserted in the axial direction is advanced and retracted in the axial direction of the main shaft. In a vertical axis movable blade pump in which a blade angle operating mechanism for changing a blade angle is provided above the discharge pipe, the direction changer is fixed to a lid portion that closes an upward opening of the discharge pipe, and the discharge pipe And the wing angle operating machine There has been characterized by being mounted on the lid.
[0008]
According to the present invention, since the direction changer is built in the discharge pipe, and the blade angle operating mechanism is placed on the lid portion that closes the opening of the discharge pipe, the protruding height of the vertical axis movable blade pump can be reduced. It can be lowered by an amount corresponding to the height of the direction changer. As described above, the protruding height of the vertical shaft movable blade pump is reduced, so that a low-weight and lightweight prime mover stand can be erected on the pump installation floor, and the prime mover can be placed on the prime mover stand. As a result, the height from the pump installation floor to the top of the prime mover is reduced, and the load applied to the pump installation floor can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a main part of the present invention. The bearing 1, the impeller 3, the discharge bowl 4, the pumping pipe 5, the suction bell 7, the discharge valve 8, the drain pipe 9, the discharge water tank 10, the backflow prevention flap valve 11, and the like described in the conventional example are shown in FIG. 3 is the same as the illustrated example of FIG. 3, the description of the structure and the description of the operation are omitted, and the same or corresponding parts are denoted by the same reference numerals.
[0010]
1 and 2, reference numeral 14 denotes a direction changer. This direction changer 14 is used to transmit the output rotation of the prime mover 20 to the main shaft 2 by orthogonal transformation (direction change), and can open and close an upward opening 27 provided at the upper end of the discharge elbow (discharge pipe) 6. In the state where it is fixed to the lower side of the lid portion 28, the discharge elbow 6 is built in such that it can be taken in and out through the opening portion 27. In other words, the direction changer 14 is built in the discharge elbow 6 by closing the opening 27 with the lid 28, and the direction changer 14 is taken out from the discharge elbow 6 by pulling up the lid 28 for maintenance or the like. be able to. Further, a lateral opening 27 </ b> A is provided on the side surface of the discharge elbow 6.
[0011]
The direction changer 14 includes a casing 29 having a vertical axis C1 and a horizontal axis C2 orthogonal to the vertical axis C1 and passing through the discharge center of the discharge elbow 6, and the inner end is watertight on the side wall of the casing 29. And a bearing case 30 that extends to the side, an output rotary shaft 31 on the vertical axis C1, and an input rotary shaft 32 on the horizontal axis C2, and the inside of the casing 29 has an upper direction changing mechanism. The chamber 33 and the lower mechanical seal chamber 34 are divided into two upper and lower chambers, and the inner end face of the bearing case 30 faces the direction changing mechanism chamber 33.
[0012]
The lid portion 28 is formed near the center boss portion 28A having both ends in the direction of the longitudinal axis C1 open, the large-diameter flange portion 28B formed at the upper end portion of the center boss portion 28A, and the lower end portion of the center boss portion 28A. A small-diameter flange portion 28C. Then, a small-diameter flange portion 28C is placed on the outer peripheral edge portion of the upper end opening 35 in the casing 29 with a seal ring (not shown) interposed therebetween, and fastened with a plurality of bolts (not shown), thereby the lid portion 28. The casing 29 of the direction changer 14 is fixed in a watertight and detachable manner. Further, the outer peripheral edge of the large-diameter flange 28B is placed on the flange 27B on the outer periphery of the opening 27 in the discharge elbow 6 through a seal ring (not shown), and a plurality of bolts and nuts (not shown) are used. By fastening, the opening 27 is closed by the lid 28 so as to be watertight and openable.
[0013]
The output rotating shaft 31 includes upper and lower two-stage bearings 37A and 37B in a bearing case 36 assembled to the lower end portion of the central boss portion 28A in the lid portion 28, and a bearing provided in the direction changing mechanism chamber 33 in the casing 29. The bearing 37 </ b> C supported by the support portion 38 is rotatably supported and extends below the casing 29. Further, these bearings 37A, 37B, and 37C receive shaft thrust during pump operation including the weight of the rotating body such as the output rotating shaft 31, the main shaft 2, and the impeller 3.
[0014]
The input rotary shaft 32 is supported by bearings 39A, 39B, and 39C in the bearing case 30 so as to be rotatable and impossible to move in the direction of the horizontal axis C2. The bearing case 30 is led out of the discharge elbow 6 from the lateral opening 27 </ b> A, and the outer end portion of the input rotary shaft 32 extends outside the bearing case 30. Further, the outer end opening of the bearing case 30 is watertightly closed by a bearing cover 41 in which a seal ring 40 slidably in contact with the input rotary shaft 32 is fitted at the center. The bearing cover 41 is pressed against the outer end surface of the bearing case 30 by the cover presser 42 being fastened to the outer end portion of the bearing case 30 by a bolt (not shown).
[0015]
A holding cylinder 43 is fitted on part of the side walls of the bearing case 30 and the casing 29. The holding cylinder 43 is inserted from the outside of the discharge elbow 6 into the lateral opening 27A, and a seal ring (not shown) is interposed therebetween. The holding cylinder 43 is fixed to the discharge elbow 6 in a watertight and detachable manner by bringing the outer end flange portion 43A into contact with the outer periphery of the opening 27A and fastening with a plurality of bolts (not shown).
[0016]
A small bevel gear 45 is formed or fixed to the inner end portion of the input rotation shaft 32, and the small bevel gear 45 meshes with a large bevel gear 46 fixed to the output rotation shaft 31, thereby having an orthogonal transformation transmission function. The bevel gear speed reducer is configured, and the small bevel gear 45 and the large bevel gear 46 are located inside the direction changing mechanism chamber 33. The mechanical seal chamber 34 is provided with two upper and lower mechanical seals 47A and 47B, and the upper mechanical seal 47A causes the lubricating oil 48 in the direction changing mechanism chamber 33 to leak into the mechanical seal chamber 34, or the mechanical seal chamber. In addition to preventing the lubricating oil 49 in 34 from leaking into the direction changing mechanism chamber 33, the lower mechanical seal 47B causes the pumped water in the discharge elbow 6 to enter the mechanical seal chamber 34, or in the mechanical seal chamber 34. The lubricating oil 49 is prevented from leaking into the discharge elbow 6, and the output rotary shaft 31 is rotatably and watertightly sealed.
[0017]
A lower end portion of the output rotating shaft 31 is coupled to the main shaft 2 via the coupling 15 so as to be simultaneously rotatable, and an outer end portion of the input rotating shaft 32 is connected to the prime mover 20 via the couplings 18 and 18 and the intermediate shaft 19. It is connected to the output rotating shaft 21 in the horizontal direction so that it can rotate simultaneously.
[0018]
On the other hand, a stand 25 is erected on the lid 28, and a blade angle operating mechanism 24 is supported on the stand 25. That is, the gantry 25 is fixed to the lid portion 28 in a state where the upper end opening of the central boss portion 28A in the lid portion 28 is detachably and airtightly closed by the lower end base portion 25A, and the blade angle operating mechanism 24 is interposed via the gantry 25. And placed on the lid 28. Since the upper end opening of the lid portion 28 is airtightly closed by the lower end base portion 25A of the gantry 25, entry of dust into the bearings 37A and 37B in the bearing case 36 is prevented. The upper end portion of the blade angle operation rod 23 is inserted into and connected to the inside of the blade angle operation mechanism 24. Therefore, by moving the blade angle operating rod 23 in the axial direction of the main shaft 2 by operating the blade angle operating mechanism 24, the movable blade of the impeller 3 held at the reference blade angle of 0 degrees is closed (minus side). ) To reduce the amount of discharged water, or the movable blade of the impeller 3 held at the reference blade angle of 0 degrees can be rotated to the open side (plus side) to increase the amount of discharged water. .
[0019]
With such a configuration, the output of the prime mover 20 is such that the output rotary shaft 21 in the horizontal direction → the input rotary shaft 32 of the direction changer 14 → the small bevel gear 45 → the large bevel gear 46 → the output rotary shaft 31 → the coupling 50. Is transmitted to the main shaft 2 through the power transmission path, and the main shaft 2 is decelerated and rotated to operate the vertical shaft movable blade pump P. Further, since the direction changer 14 is constituted by a gear reducer having an orthogonal transformation transmission function in which the small bevel gear 45 on the input rotation shaft 32 side and the large bevel gear 46 on the output rotation shaft 31 side are meshed, the prime mover 20 Can be operated by decelerating the high rotational speed of the vertical shaft pump P to the required rotational speed at a predetermined reduction ratio.
[0020]
In addition, the direction changer 14 is built in the discharge elbow 6, and the blade angle operation mechanism 24 is disposed on the lid portion 28 that can open and close the upward opening 27 provided at the upper end of the discharge elbow 6 via the mount 25. 3, the height H from the pump installation floor 12 to the top of the blade angle operating mechanism 24, that is, the protruding height H of the vertical movable blade pump P is the protruding height of the vertical movable blade pump P of FIG. 3. Compared with H1, it can be lowered by an amount corresponding to the height of the direction changer 14. Thus, the protrusion height H of the vertical axis movable vane pump P is lowered, so that a low-weight and lightweight prime mover base 22 is erected on the pump installation floor 12 and the prime mover is installed on the prime mover base 22. Therefore, the height H3 from the pump installation floor 12 to the top of the prime mover 20 is much lower than the height H2 in FIG. 3, and the load applied to the pump installation floor 12 can be reduced. .
[0021]
【The invention's effect】
As described above, since the vertical axis movable blade pump of the present invention is configured, the following special effects are achieved.
[0022]
That is, the direction changer is fixed to the lid that closes the upward opening of the discharge pipe and is built in the discharge pipe, and the blade angle operating mechanism is placed on the lid, so that the pump The height from the installation floor to the top of the blade angle operating mechanism, that is, the protruding height of the vertical shaft movable blade pump can be lowered by an amount corresponding to the height of the direction changer.
[Brief description of the drawings]
FIG. 1 is an overall view showing an embodiment of the present invention.
FIG. 2 is an enlarged sectional view showing a main part of the present invention.
FIG. 3 is an overall view of a conventional example.
[Explanation of symbols]
1 Bearing 2 Spindle 3 Impeller 4 Discharge bowl 5 Pumping pipe 6 Discharge elbow (discharge pipe)
14 Direction changer 20 Motor 23 Blade angle operation rod 24 Blade angle operation mechanism 27 Discharge pipe opening 28 Lid P Vertical axis movable blade pump

Claims (1)

A longitudinal main shaft rotatably supported by the bearing, an impeller fixed to the lower portion of the main shaft, a discharge bowl that rotatably accommodates the impeller, and an upper side of the discharge bowl. The main shaft includes a vertical pumping pipe penetrating the main shaft and a discharge pipe connected to the upper side of the pumping pipe, and the output rotation of the prime mover is transmitted to the main shaft through a direction changer. A blade angle operating mechanism is provided above the discharge pipe to change the blade angle of the impeller by advancing and retracting a blade angle operating rod that can be rotated simultaneously and freely moved in the axial direction in the axial direction of the main shaft. In the vertical axis movable blade pump, the direction changer is fixed to a cover portion that closes the upward opening of the discharge pipe and is built in the discharge pipe, and the blade angle operation mechanism is mounted on the cover portion. Vertical axis movable wing characterized by being mounted on Amplifier.

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