JP2003120570A - Vertical shaft pump with built-in direction changer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical shaft pump with built-in direction changer capable of operating a prime motor while surely decelerating its high rotating speed to the necessary rotating speed of a vertical shaft pump. SOLUTION: This vertical shaft pump with built-in direction chamber comprises a direction changer 14 built in a discharge bend 6 provided continuously to a column pipe 5. The direction changer 14 is formed of a bevel gear reducer comprising a small bevel gear 45 fixed to the inner end part of the horizontal input rotating shaft 32 of the changer 14 and a large bevel gear 46 fixed to the vertical output shaft 31 of the changer 14, and the other reducer 60 is connected to the input rotating shaft 32 of the changer 14 and housed in a bearing case 40 supporting the input rotating shaft 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft pump with a built-in direction changing device in which the height of protrusion of a vertical shaft pump from the floor of the pump installation and the height from the floor of the pump installation to the top of the motor are reduced.

[0002]

2. Description of the Related Art By lowering the protruding height of a vertical shaft pump from a floor on which a pump is installed, a prime mover having a low height and a low weight is erected on the floor on which the pump is installed, and the prime mover is installed on the prime mover. The applicant of the present invention has proposed a vertical shaft pump with a built-in direction changing device that can reduce the height from the floor of the pump installation to the top of the prime mover and reduce the load on the floor of the pump installation (Japanese Patent Application No. 2001). -106993
issue).

The vertical pump with built-in direction changer is constructed as shown in FIGS. 4 and 5. In these figures, 14 indicates a direction changer. This direction changer 14 is for orthogonally converting (direction changing) the output rotation of the prime mover 20 and transmitting it to the main shaft 2, and can open and close an upward opening 27 provided at the upper end of the discharge bend (discharge pipe) 6. It is built in the discharge bend 6 so that it can be taken in and out from the opening 27 in a state of being fixed to the lid part 28 that is closed. That is, the opening 27
The direction changer 14 is built in the discharge bend 6 by closing the cover 28, and the direction changer 14 can be removed from the discharge bend 6 by pulling up the cover 28 for maintenance or the like. Also, the discharge bend 6
A lateral opening 27A is provided on the side surface of the.

The direction changer 14 has a casing 29 having a vertical axis C1 and a horizontal axis C2 which is orthogonal to the vertical axis C1 and an inner end portion thereof is liquid-tightly attached to a side wall portion of the casing 29 to the side. The extending bearing case 30, the output rotary shaft 31 on the vertical axis C1, and the input rotary shaft 3 on the horizontal axis C2.
2, the inside of the casing 29 is divided into two upper and lower chambers including an upper direction changing mechanism chamber 33 and a lower mechanical seal chamber 34, and the inner end surface of the bearing case 30 has a direction changing mechanism chamber 33. Facing.

The lid portion 28 has a central boss portion 28A which is open at both ends in the direction of the vertical axis C1, a large-diameter flange portion 28B formed at the upper end portion of the central boss portion 28A, and a lower end portion of the central boss portion 28A. Small diameter flange portion 28C formed nearby
It has and. Then, the small-diameter flange portion 28C is placed on the outer peripheral edge portion of the upper end opening portion 35 of the casing 29 with a seal ring (not shown) interposed therebetween, and is fastened by a plurality of bolts (not shown). Further, the casing 29 of the direction changing device 14 is liquid-tightly and detachably fixed. Further, the outer peripheral edge portion of the large-diameter flange portion 28B is placed on the flange portion 27B on the outer periphery of the opening portion 27 of the discharge bend 6 through a seal ring (not shown), and a plurality of bolts and nuts (not shown) are used. By fastening, the opening portion 27 is closed by the lid portion 28 in a watertight manner and can be opened and closed.

The output rotary shaft 31 has two upper and lower bearings 37A and 37B in a bearing case 36 assembled to the lower end of the central boss 28A of the lid 28, and a direction changing mechanism chamber 33 in the casing 29. It is rotatably supported by a bearing 37C supported by a bearing support 38 provided and extends below the casing 29. Further, these bearings 37A, 37B, 37C receive the axial thrust during pump operation including the weight of the rotating body such as the output rotary shaft 31, the main shaft 2 and the impeller 3.

The input rotary shaft 32 is rotatably supported by bearings 39A, 39B and 39C in the bearing case 30 so as not to move in the direction of the horizontal axis C2. The bearing case 30 is led out to the outside of the discharge bend 6 from the lateral opening 27A, and the input rotary shaft 3 is provided outside the bearing case 30.
The outer edge of 2 extends. Further, the outer end opening of the bearing case 30 has a seal ring 4 with which the input rotary shaft 32 is in sliding contact.
It is liquid-tightly closed by the bearing cover 41 in which 0 is fitted in the center. The bearing cover 41 is pressed against the outer end surface of the bearing case 30 by fastening the cover retainer 42 to the outer end portion of the bearing case 30 with a bolt (not shown).

A holding cylinder 43 is externally fitted to a part of the side wall of the bearing case 30 and the casing 29. The holding cylinder 43 is inserted into the lateral opening 27A from the outside of the discharge bend 6, and a seal ring (not shown) is attached. The holding cylinder 43 is watertightly and detachably fixed to the discharge bend 6 by bringing the outer end flange portion 43A into contact with the outer periphery of the opening portion 27A via the interposition and fastening them with a plurality of bolts (not shown).

A small bevel gear 45 is provided at the inner end of the input rotary shaft 32.
Is formed or fixed, and the small bevel gear 45 meshes with the large bevel gear 46 fixed to the output rotary shaft 31,
The bevel gear reducer having the orthogonal conversion transmission function is configured, and the small bevel gear 45 and the large bevel gear 46 are arranged in the direction changing mechanism chamber 33.
It is located inside. In addition, the mechanical seal chamber 34
Upper and lower two-stage mechanical seals 47A and 47B are provided in the upper and lower stages, and the upper mechanical seal 47A causes the lubricating oil 48 in the direction changing mechanism chamber 33 to leak to the mechanical seal chamber 34 or the lubricating oil 49 in the mechanical seal chamber 34. While preventing the leaking into the direction changing mechanism chamber 33,
The lower mechanical seal 47B allows the discharge bend 6
It prevents the pumped water inside from invading the mechanical seal chamber 34 and the lubricating oil 49 inside the mechanical seal chamber 34 from leaking into the discharge bend 6, and the output rotary shaft 31 is rotatably and liquid-tightly sealed. ing.

The lower end of the output rotary shaft 31 is the coupling 1
5, the outer end of the input rotary shaft 32 is coupled to the main shaft 2 so as to be rotatable at the same time.
9, the output rotary shaft 21 in the horizontal direction of the prime mover 20
Are connected so that they can rotate simultaneously.

On the other hand, the central boss portion 28A of the lid portion 28
The upper end opening is closed airtight by the lid 52 to prevent dust from entering the bearings 37A and 37B in the bearing case 36. Further, the casing 29 is supplied with a lubricating oil 49 into the mechanical seal chamber 34 to lubricate and seal the mechanical seals 47A and 47B, and at the time of replacing or inspecting the lubricating oil 49, the lubricating oil 49 is discharged. A passage 58 is provided, and the supply / drain oil passage 58 is closed so that a lubricating oil supply / drain pipe 59 can be connected. Note that FIG.
In, P is a vertical pump, 1 is a plurality of bearings, 7 is a suction bell, 8 is a discharge valve, 9 is a drain pipe, 10 is a discharge water tank, 11
Indicates a flap valve for preventing backflow.

With such a configuration, the output of the prime mover 20 is the horizontal output rotary shaft 21 → the input rotary shaft 32 of the direction changer 14 → small bevel gear 45 → large bevel gear 46 → output rotary shaft 31 → The power is transmitted to the main shaft 2 through the power transmission path of the coupling 50, the main shaft 2 is decelerated and rotated, and the vertical shaft pump P is operated. Further, since the direction changer 14 is configured by the gear reducer having the orthogonal conversion transmission function in which the small bevel gear 45 on the input rotary shaft 32 side and the large bevel gear 46 on the output rotary shaft 31 side are meshed with each other, the prime mover 20 It is possible to decelerate the high rotation speed to a required rotation speed of the vertical shaft pump P at a predetermined reduction ratio.

Moreover, since the direction changer 14 is built in the discharge bend 6, the protrusion height H of the vertical shaft pump P can be reduced to the height of the discharge bend 6. Therefore, a low and lightweight prime mover base 22 can be erected on the pump installation floor portion 12, and the prime mover 20 can be installed on the prime mover base 22. Therefore, the height H4 from the pump installation floor portion 12 to the top of the prime mover 20 is In addition to lowering the load, the effect of reducing the load applied to the pump installation floor 12 is obtained.

[0014]

However, in the conventional vertical shaft pump with a built-in direction changer, since the speed is reduced only by the direction changer 14 constituted by the bevel gear reducer having a small reduction ratio, the prime mover 20 is used. When a high-speed prime mover such as a diesel engine or a gas turbine engine is used, the prime mover 20 is used in the direction changer 14 having a small reduction ratio.
It is limited to reduce the high rpm of the vertical shaft to the required rpm of the vertical pump. Therefore, it is considered necessary to reliably reduce the high rotation speed of the prime mover 20 to the required rotation speed of the vertical shaft pump for operation.

Therefore, an object of the present invention is to provide a vertical converter built-in vertical shaft pump which can surely reduce the high rotational speed of the prime mover to the required rotational speed of the vertical shaft pump for operation.

[0016]

In order to achieve the above-mentioned object, a vertical shaft pump with a built-in direction changer according to the invention of claim 1 includes a longitudinal main shaft rotatably supported by a bearing,
An impeller fixed to the lower part of the main shaft, a discharge bowl in which the impeller is rotatably accommodated, and a vertical pumping pipe that is connected to the upper side of the discharge bowl and penetrates the main shaft. In a vertical axis pump with a built-in direction changer, which is provided with a discharge line connected to the upper side of the pumping line, and in which a direction changer that changes the direction of the output rotation of the prime mover is transmitted to the main shaft is provided in the discharge line. The direction changer is composed of a gear reducer, and another reducer is connected to the lateral input shaft of the direction changer.

It is preferable that the other speed reducer is housed in a bearing case that axially supports the lateral input shaft of the direction changer.

According to the first aspect of the invention, the rotation of the prime mover is reduced by another reducer connected to the lateral input shaft and the gear reducer constituting the direction changer is used. Because you can decelerate by compound deceleration of
The high rotation speed of the prime mover can be reliably reduced to the required rotation speed of the vertical shaft pump for operation.

Further, by accommodating the other speed reducer in the bearing case which axially supports the lateral input shaft of the direction changer, the vertical dimension of the direction changer inside the discharge pipe can be reduced. As a result, the resistance of pumped water flowing through the discharge pipe can be reduced, and the reduction in pump efficiency can be suppressed to a small level.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged sectional view showing a main part of an embodiment of the present invention. The plurality of bearings 1, the impeller 3, the discharge bowl 4, 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 in FIG. 4 are the same as those of the present invention. Therefore, these figures are omitted, and the same or corresponding parts as those in FIGS. 4 and 5 are denoted by the same reference numerals, and the overlapping description of the structure and the description of the operation are omitted.

In FIG. 1, the lateral input rotary shaft 32 of the direction changer 14 is provided inside the bearing case 30.
Another speed reducer 60 is connected. That is, the other speed reducer 60 is housed in the bearing case 30 that pivotally supports the lateral input rotation shaft 32 of the direction changer 14. Although the model of the other speed reducer 60 is arbitrary, if it is configured to be housed in the bearing case 30, downsizing is required. Therefore, a planetary gear speed reducer such as the illustrated example is used as the other speed reducer 60. Preferably. Further, the planetary gear reducer can reduce the speed at a large reduction ratio.

As described above, in the structure in which the other input reduction shaft 60 of the direction changer 14 is connected to another speed reducer 60 which is a planetary gear speed reducer, the rotation of the prime mover 20 is controlled by the other speed reducer 60. Since the deceleration can be performed by the combined deceleration of the deceleration and the deceleration by the bevel gear reducer configuring the direction changer 14, even if a high-speed prime mover such as a diesel engine or a gas turbine engine is used as the prime mover 20. It is possible to reliably reduce the high rotation speed of the prime mover 20 to the required rotation speed of the vertical shaft pump for operation.

On the other hand, when the compound speed reduction is performed by the direction changer 14 including the bevel gear reducer and the other speed reducer 60,
Normally, after the direction is changed by the bevel gear reducer, the speed is reduced by another reducer 60. However, with such a configuration, since it is necessary to accommodate another speed reducer 60 in the casing 29 of the direction changing device 14, the casing 29
Also, the dimension of the direction changer 14 in the direction of the vertical axis C1 becomes large, and the resistance of the pumping water flowing in the discharge bend 6 becomes large accordingly, so that the pump efficiency is lowered.
However, in the present invention, since the other speed reducer 60 is connected to the lateral input rotary shaft 32 and accommodated in the bearing case 30, the vertical dimension of the direction changer 14 inside the discharge bend 6 is reduced. It is possible to suppress the resistance of the pumped water flowing through the discharge bend 6 and suppress the decrease in pump efficiency to a small level.

As shown in FIG. 2, another speed reducer 60 composed of the planetary gear speed reducer is installed outside the direction changer 14 and the discharge bend 6, and its output rotary shaft 60A is installed in the direction changer 14. By connecting the input rotary shaft 32 and the input rotary shaft 60B to the output rotary shaft of the prime mover 20 (not shown), the high speed of the prime mover 20 is surely reduced to the required speed of the vertical shaft pump to operate. be able to. Figure 2
In 60, a gear 60C is fixed to the output rotary shaft 60A by a gear, and is provided with the gear 60C and a capstan gear 60D fixed to a casing, and meshes with both the gear 60C and the capstan gear 60D to make a planetary motion. A plurality of planetary gears 60E (however, in FIG.
Only 0E is shown), and the output rotary shaft 60A is rotated. Further, a heat radiation fan 61 and a heat radiation tube 62 for expanding the heat radiation area are provided on the input rotary shaft 60B side,
The air cooling effect of another speed reducer 60 may be enhanced.

The other speed reducer 60 is not limited to the planetary gear speed reducer described in the above-mentioned embodiment, but is a simple structure composed of a spur gear train 60X as shown in FIG. 3, for example. It may be a gear reducer. In FIG. 3, the same parts as those in FIG. 1 are designated by the same reference numerals, and overlapping description will be omitted.

[0026]

As described above, since the vertical axis converter built-in vertical shaft pump of the present invention is constructed, the following special effects are obtained.

According to the first aspect of the present invention, the rotation of the prime mover can be reduced by the combined reduction of the speed reduction by the other speed reducer and the speed reduction by the gear speed reducer constituting the direction changer. Even if a high-speed prime mover such as a diesel engine or a gas turbine engine is used as the prime mover, the high-speed prime mover can be surely decelerated to the required speed of the vertical shaft pump to operate.

According to the second aspect of the invention, the other speed reducer is accommodated in the bearing case that axially supports the lateral input shaft of the direction changer, so that the direction inside the discharge pipe is reduced. Since the vertical dimension of the converter can be kept small, the resistance of pumped water flowing through the discharge pipe can be reduced, and the decrease in pump efficiency can be kept small.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is an illustration showing another installation position of another speed reducer.

FIG. 3 is a schematic configuration diagram showing a modified example of another speed reducer.

FIG. 4 is an overall view of a conventional example.

FIG. 5 is an enlarged cross-sectional view showing a conventional discharge pipe, a direction changer, and the like.

[Explanation of symbols]

1 bearing 2 spindles 3 impeller 4 Discharge bowl 5 Pumping pipe 6 Discharge bend (Discharge pipe) 14 Gear reducer (direction changer) 20 prime mover 30 bearing case 31 Input rotating shaft (input shaft) 60 Other reducers

Claims (2)

[Claims] 1. A vertical main shaft rotatably supported by a bearing, an impeller fixed to the lower part of the main shaft, a discharge bowl accommodating the impeller rotatably, and an upper side of the discharge bowl. And a vertical pumping pipe that penetrates through the main shaft and a discharge pipe that is continuously connected to the upper side of the pumping pipe, and the output rotation of the prime mover is redirected to the discharge pipe. In a vertical-direction-inverter built-in vertical pump having a built-in direction-changing device for transmitting to a main shaft, the direction-changing device is constituted by a gear reducer, and another speed-reducing device is provided on a lateral input shaft of the direction-changing device. Vertical pump with built-in direction changer, characterized in that 2. The vertical shaft pump with a built-in direction changer according to claim 1, wherein the other speed reducer is housed in a bearing case that axially supports a lateral input shaft of the direction changer.