JP4147023B2 - Vertical shaft pump with built-in direction changer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical pump with a built-in direction changer in which the protruding height of a vertical pump from the pump installation floor and the height from the pump installation floor to the top of a prime mover are reduced.
[0002]
[Prior art]
By lowering the protruding height of the vertical pump from the pump installation floor, a low-profile and lightweight prime mover base is erected on the pump installation floor, the prime mover is installed on this prime mover base, and the pump installation floor A vertical pump with a built-in direction changer that can reduce the load from the motor to the top of the prime mover and reduce the load applied to the pump installation floor has already been proposed by the present applicant (Japanese Patent Application No. 2001-2001). 106993).
[0003]
The direction changer built-in vertical shaft pump is configured as shown in FIGS. In these drawings, 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 lid portion 28 that is closed, the discharge elbow 6 is built into the opening portion 27 so that it can be taken in and out. 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.
[0004]
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.
[0005]
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.
[0006]
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.
[0007]
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).
[0008]
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).
[0009]
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.
[0010]
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.
[0011]
On the other hand, the upper end opening of the central boss portion 28A in the lid portion 28 is hermetically closed by the lid 52, and dust is prevented from entering the bearings 37A and 37B in the bearing case 36. Also, the casing 29 is supplied with lubricating oil 49 to the mechanical seal chamber 34 to lubricate and seal the mechanical seals 47A and 47B, and supply / drain oil for discharging the lubricating oil 49 when the lubricating oil 49 is replaced or inspected. A passage 58 is provided, and the supply / drain oil passage 58 is closed to allow connection of the lubricant supply / drain pipe 59. In FIG. 3, P is a vertical shaft pump, 1 is a plurality of bearings, 4 is a discharge bowl, 5 is a pumping pipe, 7 is a suction bell, 8 is a discharge valve, 9 is a drain pipe, 10 is a discharge water tank, 11 is The flap valve for backflow prevention is shown.
[0012]
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 15 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 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.
[0013]
Moreover, since the direction changer 14 is built in the discharge elbow 6, the protruding height H from the pump installation floor 12 to the top of the vertical shaft pump P can be reduced to the height of the discharge elbow 6. Therefore, since the low-weight and lightweight prime mover base 22 is erected on the pump installation floor 12 and the prime mover 20 can be installed on the prime mover base 22, the height H4 from the pump installation floor 12 to the top of the prime mover 20 is While lowering, the effect of reducing the load applied to the pump installation floor 12 is obtained.
[0014]
[Problems to be solved by the invention]
However, in the conventional vertical shaft with a built-in direction changer, the direction changer 14 sets the axis of the input rotary shaft 32 on the horizontal axis C2 passing through the center of the discharge port 6A in the discharge elbow 6 to set the discharge elbow 6. Therefore, it protrudes below the horizontal axis C2 as indicated by H1 in FIG. For this reason, the fluid passage area in the discharge elbow 6 becomes small, the loss in the discharge bend 6 is increased, and the pump efficiency is lowered. Therefore, it is considered necessary to enlarge the fluid passage area in the discharge bend 6 in which the direction changer 14 is built in, to reduce the loss in the discharge elbow, and to suppress the decrease in pump efficiency.
[0015]
Therefore, the present invention provides a vertical pump with a built-in direction changer that can expand the fluid passage area in the discharge elbow (discharge pipe), reduce the loss in the discharge pipe, and suppress the decrease in pump efficiency. It is an object.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a vertical pump with a built-in direction changer according to the invention described in claim 1 includes a longitudinal main shaft rotatably supported by a bearing, an impeller fixed to a lower portion of the main shaft, A discharge bowl in which the impeller is rotatably accommodated, connected to the upper side of the discharge bowl, and a vertical pumping pipe penetrating the main shaft, and connected to the upper side of the pumping pipe. and a discharge pipe, in the direction converter built elevational axis pump direction converter is incorporated for transmitting and redirecting the main shaft the output rotation of the prime mover to the discharge pipe, the direction conversion machine, the lubricating oil is equipped A casing divided into an upper direction change mechanism chamber and a lower mechanical seal chamber, the casing being fixed to a lid provided at the upper end of the discharge elbow and a part of the side wall of the casing Has a discharge el The lateral is fixed to the opening, by setting the axis of the input rotary shaft of the direction changing device to the upper than the transverse axis through the center of the discharge port of the discharge pipe, the installation level of the direction converter It is characterized by raising the bottom in the discharge pipe.
[0017]
Moreover, it is preferable to provide an inner lid having a rectifying function between the outer surface of the direction changer and the inner surface of the discharge pipe.
[0018]
Further, the direction changer is provided with a primary side input rotary shaft having an axis parallel to the axis of the input rotary shaft below the input rotary shaft, and the primary side input rotary shaft and the input rotary shaft are connected to a spur gear train. They may be connected to each other via.
[0019]
According to the first aspect of the present invention, the fluid passage area in the discharge pipe is expanded corresponding to the amount of installation of the direction changer raised in the discharge pipe. For this reason, the loss in a discharge pipe can be reduced and the fall of pump efficiency can be suppressed small.
[0020]
According to the second aspect of the present invention, since the disturbance of the pumped water in the discharge pipe can be relaxed and rectified by the inner lid, the reduction in pump efficiency can be further reduced.
[0021]
Furthermore, according to the invention described in claim 3, since the height of the output rotary shaft of the prime mover can be lowered to the same low level as the height of the primary side input rotary shaft, the distance from the installation floor to the top of the prime mover can be reduced. The height can be kept low, and the spur gear train has a speed reduction function to reduce the rotation of the primary input rotation shaft and transmit it to the input rotation shaft, thereby reducing the high rotation speed of the prime mover to the required rotation speed of the vertical pump. You can easily decelerate and drive.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged sectional view showing an embodiment of the present invention. A plurality of bearings 1, an impeller 3, a discharge bowl 4, a suction bell 7, a discharge valve 8, a drain pipe 9, a discharge water tank 10, a backflow prevention flap valve 11 and the like in FIG. 3 are the same as those in the present invention. Therefore, these illustrations are omitted, and the internal structure of the direction changer 14 shown in FIG. 4 is the same as the internal structure of the direction changer applied to the present invention. Is omitted.
[0023]
In FIG. 1, the position of the axis C3 of the input rotary shaft 32 of the direction changer 14 is set higher than the position of the horizontal axis C2 passing through the center of the discharge port 6A of the discharge elbow 6 by an amount equivalent to H2, and the direction changer 14 Is set higher in the discharge elbow 6 than the installation level in FIG. 4, and the lower end surface thereof is positioned above the horizontal axis C2.
[0024]
Further, between the outer surface of the direction changer 14 and the inner surface of the discharge elbow 6, an inner lid 13 is provided that protrudes rightward and has a downward arc-shaped cross section and projects in a bowl shape. The inner lid 13 has an inner peripheral side 13 A attached to the outer surface of the direction changer 14, and when the direction changer 14 is built in the discharge elbow 6, the outer peripheral side 13 B contacts the inner surface of the discharge elbow 6. Alternatively, the outer peripheral side 13B of the inner lid 13 may be attached to the inner surface of the discharge elbow 6 and the direction changer 14 may be inserted into the inner peripheral side 13A.
[0025]
As described above, the axis C3 of the input rotating shaft 32 of the direction changer 14 is set higher than the horizontal axis C2 passing through the center of the discharge port 6A of the discharge elbow 6 by an amount equivalent to H2, and the direction changer 14 is installed. Since the level is raised in the discharge elbow 6, the fluid passage area in the discharge elbow 6 is expanded corresponding to the raised portion. For this reason, the loss in the discharge elbow 6 can be reduced, and the reduction of pump efficiency can be suppressed small.
[0026]
Furthermore, an inner lid 13 is provided between the outer surface of the direction changer 14 and the inner surface of the discharge elbow 6, which has an upward and downward arcuate cross section and projects in a bowl shape. The turbulence of the pumped water in the elbow 6 can be relaxed and rectified. Thereby, the fall of pump efficiency can be suppressed further smaller.
[0027]
Next, a second embodiment of the present invention will be described. FIG. 2 is an enlarged sectional view showing a second embodiment of the present invention. A plurality of bearings 1, an impeller 3, a discharge bowl 4, a suction bell 7, a discharge valve 8, a drain pipe 9, a discharge water tank 10, a backflow prevention flap valve 11 and the like in FIG. 3 are the same as those in the present invention. Therefore, these illustrations are omitted, and the same parts as the internal structure of the direction changer 14 shown in FIG. Also, the same parts as those in the first embodiment of FIG.
[0028]
In FIG. 2, the direction changer 14 is rotatably provided with a primary side input rotary shaft 16 having an axis C4 parallel to the axis C3 of the input rotary shaft 32 below the input rotary shaft 32. The part is led out of the direction changer 14. Further, the primary side input rotary shaft 16 and the input rotary shaft 32 are connected to each other inside the direction changer 14 via a spur gear train 17 so as to be simultaneously rotatable.
[0029]
With such a configuration, as in the first embodiment of FIG. 1, the fluid passage area in the discharge elbow 6 is expanded corresponding to the amount that the direction changer 14 is raised in the discharge elbow 6. The For this reason, the loss in the discharge elbow 6 can be reduced and the reduction in pump efficiency can be suppressed to a small level, and the height of the output rotary shaft 21 of the prime mover 20 (see FIG. 3) is set to the primary input rotary shaft in FIG. Since it can be lowered to a level as low as 16, the height from the pump installation floor 12 to the top of the prime mover 20 can be kept lower than H4 in FIG. 3. Further, the spur gear train 17 has a speed reducing function for reducing the speed of the rotation of the primary side input rotary shaft 16 and transmitting it to the input rotary shaft 32, thereby constituting the speed change by the spur gear train 17 and the direction changer 14. Since the speed can be reduced by a combined reduction with the reduction by the bevel gear speed reducer, even if a high speed prime mover such as a diesel engine or a gas turbine engine is used as the prime mover 20, the high rotational speed of the prime mover 20 is set to the vertical pump P. Can be easily decelerated to the required rotational speed.
[0030]
【The invention's effect】
As described above, since the vertical pump with a built-in direction changer according to the present invention is configured, the following special effects can be obtained.
[0031]
According to the first aspect of the present invention, since the installation level of the direction changer is raised in the discharge pipe, the fluid passage area in the discharge pipe is enlarged corresponding to the raised level. For this reason, the loss in a discharge pipe can be reduced and the fall of pump efficiency can be suppressed small.
[0032]
According to the second aspect of the present invention, since the turbulence of the pumped water in the discharge pipe can be relaxed and rectified by the inner lid, the reduction in pump efficiency can be further reduced.
[0033]
According to the invention described in claim 3, since the height of the output rotary shaft of the prime mover can be lowered to the same low level as the height of the primary input rotary shaft, the height from the installation floor to the top of the prime mover Can be kept low. Furthermore, by providing the spur gear train with a speed reducing function that reduces the rotation of the primary input rotary shaft and transmits it to the input rotary shaft, even if a high speed prime mover is used, the high rotational speed of this prime mover is required for the vertical pump. It can be easily decelerated to the number of revolutions.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view showing a main part of an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a main part of a second embodiment of the present invention.
FIG. 3 is an overall view of a conventional example.
FIG. 4 is an enlarged cross-sectional view showing the internal structure of the direction changer.
FIG. 5 is an enlarged cross-sectional view showing the installation level in the discharge pipe of the direction changer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bearing 2 Spindle 3 Impeller 4 Discharge bowl 5 Pumping pipe 6 Discharge elbow (discharge pipe)
6A Discharge port of discharge pipe 13 Inner lid 14 Gear reducer (direction changer)
16 Primary side input rotating shaft 17 Spur gear train 20 Prime mover
27 opening
28 Lid
29 Casing 32 Input rotating shaft (input shaft)
33 Direction change mechanism room
34 Mechanical seal chamber
43 Holding cylinder
48 Lubricating oil C2 Horizontal axis passing through the center of the discharge port C3 Input rotary shaft axis C4 Primary input rotary shaft axis

Claims (3)

A vertical main shaft rotatably supported by the bearing, an impeller fixed to the lower portion of the main shaft, a discharge bowl that rotatably stores the impeller, and an upper side of the discharge bowl. And a vertical pumping pipe penetrating the main shaft and a discharge pipe connected to the upper side of the pumping pipe, and a direction in which the output rotation of the prime mover is redirected and transmitted to the main shaft in the discharge pipe In the vertical shaft pump with built-in direction changer with built-in converter,
The direction changer includes a casing partitioned into an upper direction change mechanism chamber equipped with lubricating oil and a lower mechanical seal chamber, and the casing is fixed to a lid portion provided at an upper end of a discharge elbow. In addition, a part of the side wall of the casing is fixed to the lateral opening of the discharge elbow, and the axis of the input rotating shaft of the direction changer is higher than the horizontal axis passing through the center of the discharge port of the discharge pipe. A vertical pump with a built-in direction changer, wherein the installation level of the direction changer is raised in the discharge pipe.   The vertical pump with a built-in direction changer according to claim 1, wherein an inner lid having a rectifying function is provided between an outer surface of the direction changer and an inner surface of the discharge pipe.   The direction changer is provided with a primary side input rotary shaft having an axis parallel to the axis of the input rotary shaft below the input rotary shaft, and the primary side input rotary shaft and the input rotary shaft are spur gears. The vertical pump with a built-in direction changer according to claim 1, wherein the vertical pumps are connected to each other via a row.

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