JP4048041B2 - 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 The present applicant has proposed a vertical shaft pump with a built-in direction changer that can reduce the height from the motor to the top of the prime mover and reduce the load applied to the pump installation floor (Japanese Patent Application No. 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 the upward opening 27 provided at the upper end of the discharge bend (discharge pipe) 6. It is built in the discharge pipe 6 so that it can be taken in and out from the opening 27 in a state of being fixed to the lid portion 28 that is closed. That is, the direction changer 14 is built in the discharge pipe 6 by closing the opening 27 with the lid part 28, and the direction changer 14 is taken out from the discharge pipe 6 by pulling up the cover part 28 for maintenance and the like. be able to. Further, a lateral opening 27 </ b> A is provided on the side surface of the discharge pipe 6.
[0004]
The direction changer 14 has a casing 29 having a longitudinal axis C1 and a horizontal axis C2 orthogonal to the longitudinal axis C1, and a bearing case in which the inner end is attached to the side wall of the casing 29 in a liquid-tight manner and extends laterally. 30, an output rotary shaft 31 on the vertical axis C 1, and an input rotary shaft 32 on the horizontal axis C 2, and the inside of the casing 29 includes an upper direction changing mechanism chamber 33 and a lower mechanical seal chamber. 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 liquid-tight 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 pipe 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 to the outside of the discharge pipe 6 from the lateral opening 27 </ b> A, and the outer end portion of the input rotary shaft 32 extends to the outside of the bearing case 30. In addition, the outer end opening of the bearing case 30 is liquid-tightly 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 into the lateral opening 27A from the outside of the discharge pipe 6, and a seal ring (not shown) is interposed therebetween. The holding cylinder 43 is fixed to the discharge pipe 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. A gear 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. 34 prevents leakage of the lubricating oil 49 in the direction change mechanism chamber 33, and the lower mechanical seal 47B causes the pumped water in the discharge pipe 6 to enter the mechanical seal chamber 34 or the mechanical seal chamber 34. The lubricating oil 49 is prevented from leaking into the discharge pipe 6, and the output rotary shaft 31 is rotatably and liquid-tightly 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, 7 is a suction bell, 8 is a discharge valve, 9 is a drain pipe, 10 is a discharge water tank, and 11 is a flap valve for preventing backflow.
[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 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 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 pipe 6, the protruding height H of the vertical pump P can be reduced to the height of the discharge pipe 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 pump with a built-in direction changer, even if the mechanical seals 47A and 47B are damaged and the shaft sealing function is impaired, this state cannot be detected quickly and reliably. For this reason, when mechanical seal 47A, 47B is damaged, it is thought that it is necessary to detect a damage state quickly and reliably.
[0015]
Therefore, an object of the present invention is to provide a vertical pump with a built-in direction changer that can detect this state quickly and reliably if the mechanical seal is damaged.
[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 direction changer that changes the direction of output rotation of the prime mover and transmits it to the main shaft. The direction changer includes a discharge pipe that is directed downward from the direction change mechanism chamber. A mechanical seal is provided to prevent the intrusion into the direction changing mechanism chamber in the discharge pipe by sealing the upper part of the main shaft introduced into the vertical output rotating shaft or the direction changing mechanism chamber led to Mechanical seal chamber In the direction converter built elevational shaft pumps are provided, it is characterized in that the mechanical seal chamber is open to the atmosphere through the air release system.
[0017]
Moreover, it is preferable to provide a lubricating oil leakage preventing portion at a position higher than the lubricating oil level in the mechanical seal chamber in the atmosphere opening system.
[0018]
According to the first aspect of the present invention, when the mechanical seal is damaged and the pumped water in the discharge pipe enters the mechanical seal chamber, the lubricating oil in the mechanical seal chamber becomes cloudy and the amount of pumped water intrusion is reduced. Corresponding white turbid lubricating oil leaks out from the open air system, and the damage state of the mechanical seal can be detected quickly and reliably by observing this leak or detecting the flow in the open air system caused by the leak. can do.
[0019]
In addition, a lubricant leakage prevention part positioned higher than the lubricating oil level in the mechanical seal chamber is provided in the open air system so that the lubricating oil in the mechanical seal chamber can be It is possible to prevent leakage.
[0020]
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 a main part of one 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 or corresponding parts as those in FIG. 4 are denoted by the same reference numerals, and overlapping structural descriptions and operational descriptions are omitted.
[0021]
In FIG. 1, the mechanical seal chamber 34 is open to the atmosphere via an open air system 60. The atmosphere opening system 60 is constituted by a pipe line that allows the mechanical seal chamber 34 to communicate with the atmosphere, and this pipe line includes a rising portion 60A formed outside the vertical shaft pump P, that is, outside the discharge pipe 6, and Lubricating oil leakage preventing portion 60B extending horizontally from the upper end of the rising portion 60A in a direction away from the discharge pipe 6, and a discharging portion 60C extending downward from the tip of the lubricating oil leakage preventing portion 60B and having its lower end opened. The discharge part 60C is inserted into a collection container 61 formed of a transparent material such as synthetic resin. The position of the lubricating oil leakage preventing portion 60B is set to a position higher than the oil level OL of the lubricating oil 49 in the mechanical seal chamber 34.
[0022]
Thus, since the position of the lubricating oil leakage preventing portion 60B is set to a position higher than the oil level OL of the lubricating oil 49, the lubricating oil in the mechanical seal chamber 34 in the normal state of the mechanical seals 47A and 47B. 49 can be prevented from leaking out from the open air system 60. Further, by connecting a lubricating oil supply / exhaust pipe (not shown) to the atmosphere opening system 60, an oil supply passage when the lubricating oil 49 is supplied to the mechanical seal chamber 34 in the atmosphere opening system 60 or replacement of the lubricating oil 49 is exchanged. It is also possible to function as an oil discharge passage for discharging the lubricating oil 49 during inspection.
[0023]
On the other hand, when the lower mechanical seal 47B is damaged and the pumped water in the discharge pipe 6 enters the mechanical seal chamber 34, the lubricating oil 49 in the mechanical seal chamber 34 becomes cloudy and the cloudiness substantially corresponding to the amount of pumped water intrusion. The leaked lubricating oil 49 leaks from the open air system 60 and is collected in the collection container 61. By visually observing this leakage / recovery, the damaged state of the lower mechanical seal 47B can be detected quickly and reliably. In addition, the lower mechanical seal 47B can be repaired or replaced.
[0024]
Further, when the upper mechanical seal 47A is damaged and the lubricating oil 48 in the direction changing mechanism chamber 33 leaks into the mechanical seal chamber 34, the lubricating oil 49 in the mechanical seal chamber 34 is discolored and the lubricating oil 48 enters. Since the discolored lubricating oil 49 substantially corresponding to the amount leaks from the open air system 60 and is collected in the collection container 61, the damage state of the upper mechanical seal 47A can be quickly and surely observed by visually observing the leakage and collection. It is possible to repair or replace the upper mechanical seal 47A at an early stage.
[0025]
In addition, it is not limited to visually detecting leakage from the atmosphere open system 60 to the outside, but may be configured to detect a flow in the atmosphere open system 60 caused by the leak with a flow detector (not shown), The damaged state of the mechanical seals 47A and 47B can be detected quickly and reliably, and the mechanical seals 47A and 47B can be repaired or replaced at an early stage.
[0026]
Further, the lubricating oil leakage preventing portion 60B of the open air system 60 is not limited to the structure formed horizontally extending from the upper end of the rising portion 60A as in the above-described embodiment. ), An oil tank 60E having an oil level gauge 60D visible from the outside is attached to the upper end of the rising portion 60A, and the inside of the oil tank 60E is connected via an air breather 60F provided at the upper end thereof. While releasing the atmosphere, the oil level OL1 of the lubricating oil 49 in the oil tank 60E is set to a level higher by Δh than the oil level OL of the lubricating oil 49 in the mechanical seal chamber 34, and a portion corresponding to Δh is set. The lubricating oil leakage prevention unit 60B may be used. Further, as shown in FIG. 2 (B), even an inverted U-shaped atmospheric open system 60 provided with a rising portion 60A, a lubricant leakage preventing portion 60B bent downward, and a discharge portion 60C. Good.
[0027]
Further, the output rotary shaft 31 is rotatably and liquid-tightly sealed with two upper and lower mechanical seals 47A and 47B, and the main shaft 2 is connected to the lower end portion of the output rotary shaft 31 via the coupling 15 so as to be simultaneously rotatable. The upper portion of the main shaft 2 is introduced into the direction changing mechanism chamber 33, and the upper portion of the main shaft 2 is guided downward from the direction changing mechanism chamber 33 into the discharge pipe 6 in the vertical direction. A structure that functions as a shaft and is rotatably and liquid-tightly sealed by two upper and lower mechanical seals 47A and 47B, that is, a structure in which the output rotating shaft 31 and the coupling 15 in FIG. 1 are omitted.
[0028]
【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.
[0029]
According to the first aspect of the present invention, even if the mechanical seal is damaged and the shaft seal function is impaired, this state is detected quickly and reliably, and the mechanical seal is repaired or replaced at an early stage. be able to.
[0030]
According to the second aspect of the present invention, the lubricating oil leakage prevention portion at a position higher than the lubricating oil surface level in the mechanical seal chamber is provided in the open air system so that the lubricating oil in the mechanical seal chamber can be maintained in a normal state of the mechanical seal. Can be prevented from leaking outside from the open system.
[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 a configuration diagram showing a modified example of the open air system.
FIG. 3 is an overall view of a conventional example.
FIG. 4 is an enlarged cross-sectional view showing a conventional direction change machine and a mechanical seal chamber.
[Explanation of symbols]
1 Bearing 2 Spindle 3 Impeller 4 Discharge bowl 5 Pumping pipe 6 Discharge curved pipe (Discharge pipe)
14 Direction changing machine 20 Motor 31 Direction rotating machine output rotation shaft 33 Direction changing mechanism chamber 34 Mechanical seal chamber 47A Upper mechanical seal 47B Lower mechanical seal 49 Lubricating oil 60 in mechanical seal chamber 60 Open air system 60B Lubricating oil leakage prevention part OL Lubricating oil level in the mechanical seal chamber

Claims (2)

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 A converter is built in, and the direction changer includes a vertical output rotating shaft led out from the direction change mechanism chamber downward into the discharge pipe or an upper portion of the main shaft introduced into the direction change mechanism chamber. In a vertical pump with a built-in direction changer equipped with a mechanical seal chamber provided with a mechanical seal that prevents the penetration of pumped water in the discharge pipe into the direction change mechanism chamber, the mechanical seal chamber is open to the atmosphere. Direction converter built elevational shaft pump, characterized in that open to the atmosphere through the. The vertical pump with a built-in direction changer according to claim 1, wherein a lubricating oil leakage prevention portion at a position higher than the lubricating oil surface level in the mechanical seal chamber is provided in the open air system.

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