JP2011106331A - Column type submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a column type submerged pump freely mountable and demountable to and from a lifting pipe, and having reduced hoisted height of the submerged pump. <P>SOLUTION: In the column type submerged pump 2, a suction bell 7 is arranged on the lower end of a column 3. A guide vane 12 with an annular guide vane hub 24 fixed on the inner circumferential end on the upper side of the suction bell 7 is provided. The outer diameter of an impeller 11 of the submerged pump 4 is smaller than the inner diameter of the guide vane hub 24. Simultaneously, an opening 18 is provided on the upper end of the column 3 slantingly from near the top of the pipe of the column 3 toward the position opposite to a discharge pipe 14. The reduction of the hoisting load reduces the size of incidental facilities such as a crane and save energy in power consumption. Since the submerged pump 4 to be hoisted has a short total length, it can be removed if hoisted up to the lower end of the opening 18. Therefore, the hoisting margin is lowered and also the height of a whole building is lowered. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a column-type submersible pump that is detachable from a pumping pipe, and relates to an improvement of a device for lowering the lifting height of the submersible pump inside the pumping pipe.

Conventionally, a column-type submersible pump that supports a submersible motor pump at the bottom of a pumping pipe from above the pumping pipe by suspending a removable submersible motor pump installed at the bottom of the pumping pipe installed in a water absorption tank or the like. A technique for detachably lifting and disposing a submersible motor pump in a pumping pipe after removing the pipe is known as disclosed in Patent Document 1, for example.

In Patent Document 2, a submersible motor pump unit is installed via a suspension pipe from a flange (lid) engaged with an upper end of an outer casing (column), and the interior of the outer casing is raised above the suspension pipe. There is disclosed a column submersible pump provided with a deflector for smoothly guiding pumped water to a discharge port.

Patent Document 3 discloses a pull-out vertical shaft pump that removes a pump by pulling a pump main shaft system including an impeller upward from a pumping pipe with a guide vane installed in the pumping pipe.

Japanese Utility Model Publication No. 3-23692 (FIG. 1) JP 58-138293 A (FIG. 1) Japanese Examined Patent Publication No. 62-14720 (FIG. 1)

  The submersible motor pump disclosed in Patent Document 1 includes a submersible motor, an impeller engaged with a shaft of the submersible motor, a discharge bowl including guide vanes that rectify a water flow pressurized by the impeller, Since it is comprised from the outer periphery of an impeller and the suction bell extended below with a predetermined clearance, there existed a problem that while the full length became long in the axial direction, the lifting weight became heavy. In addition, since the lid that closes the opening at the top of the pumping pipe is horizontally arranged, when taking out the submersible motor pump inside the pumping pipe, the submersible motor pump is lifted up to a position where it goes out of the opening. It was necessary and it was difficult to secure a lifting allowance for lifting with an overhead crane or the like.

The column type submersible pump disclosed in Patent Document 2 is provided with a deflector for smoothly guiding the pumped water rising in the outer casing to the discharge port, below the lid that closes the opening at the upper end of the outer casing (column). However, when the lid becomes heavy and the mounting angle of the lid is different, there is a problem that water flow resistance (pressure loss) increases due to the internal deflector. Moreover, since the lid | cover which has closed the opening of the upper end of a pumping pipe is arrange | positioned horizontally, the subject similar to patent document 1 exists.
Since the vertical shaft pump disclosed in Patent Document 3 is a land-type pump, a driving machine is generally connected to the upper end of the main shaft. When the pump and the drive unit are disconnected, it is possible to pull up only the pump spindle system including the impeller while the pumping pipe with the guide vanes installed on the pump floor. There is a problem that it is very long because it penetrates from the impeller through the inside of the pumping pipe and penetrates upward, and it is difficult to secure the lifting allowance to the ceiling, and the workability is very poor.
The present invention provides a column-type submersible pump that can reduce the lifting height of a submersible pump that is detachable from a pumping pipe.

The gist of the column type submersible pump according to the present invention is a submersible pump that is detachable from a column installed in a water absorption tank, and is provided with guide vanes above a suction bell at the lower end of the column, and is opposed to a discharge pipe from the vicinity of the top of the column pipe. Since the opening inclined toward the position to be installed is provided and the lowermost end of the opening is positioned below the center line of the discharge pipe intersecting the opening, the lifting height when taking out the submersible pump can be lowered. At the same time, the pumped water in the column can be smoothly guided to the discharge pipe.

In addition, the guide vane hub is fixed to the inner peripheral end of the guide vane, and the inner diameter of the guide vane hub is larger than the outer diameter of the impeller of the submersible pump, so the guide vane, suction bell, etc. With the outer casing that forms the flow path installed, only the short pump main shaft system including the submersible motor and impeller can be pulled upward and removed, and the size of auxiliary equipment such as cranes can be reduced by reducing the lifting load. This makes it possible to save power consumption.

It consists of a mounting plate that is fixed to the column opening flange of the opening, a detachable guide that is connected to the mounting plate via a tilting device, and a detachable support that is provided with a cushioning material sandwiched near the tip of the detachable guide. By installing the detachable device, the lifting height can be further reduced, and the loading and unloading can be carried out in a stable state, improving the workability in installation and maintenance inspection after operation, making it a useful pump in emergency and renewal .

Install the column on the top wall of the water tank, connect it to the upper pumping pipe with the opening at the top, the lower pumping pipe, the lower pumping pipe with the guide vane on the inner wall, and the lower pumping pipe Since it is composed of a suction bell, the lifting height of each pipe is low, and it can be installed with an existing overhead crane etc. when replacing with an existing pump installed in a conventional building with a low ceiling, It can be easily replaced with a horizontal pump.

The column type submersible pump according to the present invention is a column installed on the pump floor, with an outer casing forming a flow path such as a guide vane and a suction bell disposed, and only a pump main shaft system including an underwater electric motor and an impeller. Can be pulled out and removed, reducing the lifting load, reducing the size of auxiliary equipment such as cranes, reducing energy consumption, and the total length of the suspended submersible pump is short, so it can be easily attached to and detached from the column. It is possible and the whole building can be made low.
In addition, the position where it is opposed to the discharge pipe above the column is inclined and a lid is provided there, so that the lifting height when taking out the submersible pump can be lowered, and the pumped water in the column can be smoothly guided to the discharge pipe. Can do.
Furthermore, by providing a detachable device on the flange at the upper end of the column opening, it is not necessary to lift the submersible pump until the entire length of the submersible pump comes out of the opening, and it is possible to stably take out the submersible pump.

It is a partial longitudinal cross-sectional view of the column type submersible pump concerning this invention. Similarly, it is a partially enlarged view of the submersible pump. Similarly, it is a partial longitudinal cross-sectional view of a column type submersible pump. Similarly, it is a partial longitudinal cross-sectional view of the state where the submersible pump is lifted to the opening. Similarly, it is a conceptual diagram of an attaching / detaching method of the submersible pump using the attaching / detaching device. Similarly, it is an enlarged view of a detachable device. Similarly, it is an arrow view of the AA part. It is a partial longitudinal cross-sectional view of the conventional column type submersible pump.

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial longitudinal sectional view of a column-type submersible pump, and a column-type submersible pump 2 installed in a water-absorbing tank 1 And a submersible pump 4 inserted in the column 3.
The column 3 includes an upper pumping pipe 5 installed on the top wall of the water tank 1, a lower pumping pipe 6 connected to the lower end of the upper pumping pipe 5, and a suction bell 7 connected to the lower end of the lower pumping pipe 6. . In this embodiment, the columns 3 are divided and connected in consideration of workability such as production and installation, but may be further divided as necessary, or may be formed integrally. Moreover, in order to reduce the load which suspends the column 3 to the water absorption tank 1, you may mount the column 3 in the support stand 8 installed in the water absorption tank bottom part.

A reduced suction bell 7 is disposed at the lower end of the column 3, and an impeller 11 is disposed close to the inner peripheral surface of the suction bell 7. The inner peripheral surface of the suction bell 7 and the impeller 11 are operated with a predetermined clearance.
The flowing water sucked from the suction bell 7 is pressurized by the impeller 11 of the submersible pump 4, and the pressurized swirling flow is converted into a linear flow by the guide blade 12 provided on the inner wall of the lower pumping pipe 6, and the upper pumping pipe 5 and the submersible electric motor 13, the water is pumped to the upper part of the column 3 and discharged from the discharge pipe 14.
A hook 15 is fixed to the top wall of the submersible electric motor 13, and a chain 16 for raising and lowering the submersible pump 4 is connected to the hook 15. The upper end of the chain 16 is suspended from a latch 17 on the upper inner wall of the column 3.

  An opening 18 is provided at the top of the upper pumping pipe 5, and the submersible pump 4 inside the column 3 is suspended from the opening 18 via the chain 16. The opening 18 of the upper pumping pipe 5 is inclined from the vicinity of the top of the pipe toward the position facing the discharge pipe 14. In this embodiment, the discharge pipe 14 intersects the opening 18 at the lowermost end of the opening 18. It is located below the center line. The gasket 9 is sandwiched between the column opening flange 19 of the opening 18 and the water stop lid 10 is detachably fixed to stop the water. By tilting the position facing the discharge pipe 14, the pumped water rising in the column 3 can be guided to the discharge pipe 14, and the pressure loss at the curved pipe portion can be reduced. Further, by forming the guide 10a by matching the lower surface of the water stop lid 10 with the shape of the flow path in the column 3, the pumped water can be further smoothly guided to the discharge pipe.

FIG. 2 is a partially enlarged view of the submersible pump. The impeller 11 is fixed to the lower end portion of the main shaft 20 extending from the submersible motor 13. The main shaft 20 of the submersible motor 13 is a stator 21. The lower part is pivotally supported. The stator 21 is formed in a funnel shape so as to extend from the rear end of the impeller hub 22. The stator 21 extends in an annular shape upward from the vicinity of the inlet of the guide vane 12 and is fixed to the underwater electric motor 13.
By adjusting the thickness of the shim 23 that is connected to the underwater electric motor 13 side of the impeller 11 and is fixed to the main shaft 20, the impeller 11 is displaced in the axial direction, and the inner peripheral surface of the suction bell 7 is The clearance can be adjusted.
An annular guide blade hub 24 is fixed to the inner peripheral end of the guide blade 12 provided on the inner wall of the column 3. An inclined portion 25 is provided on the outer surface of the stator 21 of the submersible pump 4, and the inclined portion 25 is detachably locked to an engagement piece 26 provided on the inner peripheral surface of the guide vane hub 24. It is suspended inside.

FIG. 3 is a partial longitudinal sectional view of the column type submersible pump. The inner diameter D of the guide vane hub 24 provided in the lower pumping pipe 6 is larger than the outer diameter d of the impeller 11. Is suspended from the opening 18 via the chain 16, the impeller 11 of the submersible pump 4 is allowed to pass through the inside of the guide vane hub 24.

FIG. 4 is a partial vertical cross-sectional view of the state where the submersible pump is lifted up to the opening. Since the opening at the top of the column is inclined, It can move in the direction. In addition, in the state in which the outer casing that forms the flow path such as the guide vane 12 and the suction bell 7 is disposed in the column 3, only the pump main shaft system including the underwater electric motor 13 and the impeller 11 is lifted upward. The overall length of the submersible pump 4 is shortened, and the lifting allowance H can be kept low.

FIG. 8 is a partial longitudinal sectional view of a conventional column type submersible pump, and the opening 52 at the upper end of the column 51 installed in the water absorption tank 50 is formed horizontally at a position higher than the upper end of the discharge pipe 53. When taking out the submersible pump 54 in the column 51, it is necessary to lift it up to a position higher than the upper end of the discharge pipe 53.
Further, since the submersible pump 54 includes a casing that forms a flow path such as the guide vane 56 and the suction bell 57 in addition to the pump main shaft system such as the impeller 55, the total length of the submersible pump 54 is increased. The lifting allowance H ′ increases.

FIG. 5 is a conceptual diagram of a submersible pump attaching / detaching method using an attaching / detaching device. As shown in FIG. 5A, the submersible pump 4 is lifted up to a predetermined height, and is attached / detached near the lower end of the column opening flange 19. Lock to device 27. The lifting height of the submersible pump 4 does not have to be lifted to the lowest end position of the opening 18. Next, as shown in (b), when the attachment / detachment device 27 is tilted to the opposite side of the discharge pipe 14 with the submersible pump 4 locked to the attachment / detachment device 27, the lower end of the submersible pump 4 is centered on the attachment / detachment device 27. The impeller 11 rotates inside the column 3 and falls horizontally as shown in FIG. By hooking up the hook 15 and the chain 16 for lifting, it can move in a state of being tilted horizontally. When the submersible pump 4 is tilted horizontally in the column 3, the lifting height can be lowered to a position where the submersible pump 4 does not interfere with the column 3.

FIG. 6 is an enlarged view of the attachment / detachment device. The attachment / detachment device 27 includes an attachment plate 28 fixed to the column opening flange 19, an attachment / detachment guide 30 connected to the attachment plate 28 via a tilting device 29, and an attachment / detachment guide. An attachment / detachment support 32 is provided in the vicinity of the tip of 30 with a cushioning material 31 interposed therebetween.
The mounting plate 28 is detachably fixed by a bolt 33 below the column opening flange 19 from which the water stop lid 10 is removed so that the other of the tilting device 29 can tilt to the outside of the column 3.
As shown in FIG. 7, since the submersible pump 30 is placed on the attachment / detachment guide 30, the submersible guide 30 is expanded in accordance with the outer wall of the submersible pump 4, and the submersible pump 4 does not move freely when tilted.
An attachment / detachment support 32 having a protrusion 34 projecting in the vertical direction with a cushioning material 31 interposed therebetween is fixed with a bolt 35 in the vicinity of the tip of the attachment / detachment guide 30 that supports the side surface of the submersible pump 4. The protrusion 34 is formed in an arc shape to match the stator 21 of the submersible pump 4, and has an opening 37 through which a bolt 36 fixing the stator 21 and the submersible electric motor 13 can be inserted. After positioning with the bolt 36 of the submersible pump 4 and the opening 37 of the attachment / detachment support 32, the attachment / detachment guide 30 can be tilted to bring the submersible pump 4 into and out of the column 3 in a stable state.
Although the tilting device 29 of this embodiment uses a hinge, any device can be used as long as it has the same effect.

In the column type submersible pump according to the present invention, as the pump becomes larger, the size of ancillary equipment such as a crane by reducing the lifting load and the energy saving of electric power used become remarkable, and the water supply equipment can be made environmentally friendly.
Moreover, it becomes a useful renewal pump also when it replaces with the existing pump installed in the building with the conventional low ceiling, and can be easily replaced especially with a horizontal axis pump.
In addition, pumping water in the column can be smoothly guided to the discharge pipe, reducing pressure loss, and because it is a mixed flow pump, it can handle high heads and is useful as a pump for local drainage of local water. It becomes.

DESCRIPTION OF SYMBOLS 1 Water absorption tank 2 Column type submersible pump 3 Column 4 Submersible pump 5 Upper pumping pipe 6 Lower pumping pipe 7 Suction bell 10 Water stop cover 11 Impeller 12 Guide blade 14 Discharge pipe 18 Opening 19 Column opening flange 24 Guide blade hub 27 Detachment Device 28 Mounting plate 29 Tilt device 30 Attachment / detachment guide 31 Buffer material 32 Attachment / detachment support

Claims (4)

In the submersible pump (4) detachably attached to the column (3) installed in the water absorption tank (1), a guide vane (12) is provided above the suction bell (7) at the lower end of the column (3). ) An opening (18) inclined toward the position facing the discharge pipe (14) from the vicinity of the pipe top is provided, and the discharge pipe (14) crossing the lower end of the opening (18) with the opening (18). Column-type submersible pump characterized by being positioned below the center line. The guide vane hub (24) is fixed to the inner peripheral end of the guide vane (12), and the inner diameter of the guide vane hub (24) is made larger than the outer diameter of the impeller (11) of the submersible pump (4). The column type submersible pump according to claim 1. A mounting plate (28) fixed to the column opening flange (19) of the opening (18), a mounting / dismounting guide (30) connected to the mounting plate (28) via a tilting device (29), and a mounting / dismounting guide The column according to claim 1 or 2, further comprising an attachment / detachment device (27) configured by an attachment / detachment support (32) disposed by sandwiching a cushioning material (31) in the vicinity of the tip of (30). Submersible pump. The column (3) is installed on the top wall of the water absorption tank (1) and connected to the upper pumping pipe (5) having an opening (18) at the top and the lower end of the upper pumping pipe (5) and guided to the inner wall. 4. The method according to claim 1, further comprising: a lower pumping pipe (6) provided with a blade (12) and a suction bell (7) connected to a lower end of the lower pumping pipe (6). The column-type submersible pump described.