JP2024013797A - vertical shaft pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical shaft pump can shorten recovery handling time, facilitate maintenance, and reduce its load and material cost.

SOLUTION: A pullout type vertical shaft pump comprises: a discharge elbow 16 of which one end communicates with an outer casing 11, and of which the other end communicates with a discharge pipe 31; an inner casing 12 housing a main shaft 13; an intermediate bearing 20 provided between the main shaft and an inner peripheral surface of the inner casing, inside the inner casing; and ribs 172 and 173 of which one end part is connected to an outer peripheral surface of the inner casing at a position opposed to the intermediate bearing across the inner casing, and of which the other end part is connected to an inner peripheral surface of the discharge elbow. The intermediate bearing is located inside the discharge elbow.

SELECTED DRAWING: Figure 1A

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a vertical shaft pump.

BACKGROUND OF THE INVENTION In pump devices installed in rivers and the like to pump up water in suction water tanks, failure of the pump intended to prevent damage from flooding or flooding is fatal.

Japanese Patent Application Publication No. 2003-49788 JP 2019-19774 Publication

Therefore, there is a need for a pump that can be quickly restored in the event of pump failure. It is also important to maintain and manage equipment so that it can be operated reliably when needed. Therefore, it is necessary to reduce the effort and cost involved, and there is also a demand for easier maintenance and management.

Standard vertical pumps have rotating bodies such as the impeller and main shaft, as well as the bowl and discharge pipe, which are manufactured as a single unit, so in the event of a failure, the components must be disassembled and repaired after the pump is pulled up, requiring recovery work. It takes time. The same applies to maintenance and management such as inspection and maintenance. Therefore, there is a need for a pump that can be quickly restored and that is easy to maintain and manage.

Column type and pullout type vertical shaft pumps are one of the existing technologies that meet the above demand (see, for example, Patent Document 1 and Patent Document 2). These vertical shaft pumps have a pull-out section consisting of an impeller, casing, main shaft, etc., and a fixed section consisting of a column pipe, etc., and only the pull-out section can be pulled out during maintenance. .

However, while the above-mentioned pump has a removable structure that facilitates maintenance and management, the main shaft and inner shell (also known as the inner casing) are equipped with bearings that support the load of the impeller and bowl and suppress vibrations during operation. It is necessary to ensure sufficient strength against the above-mentioned materials, which poses the problem of increased load and material costs.

The present invention was made in view of the above problems, and aims to provide a vertical shaft pump that shortens recovery response time, facilitates maintenance and management, and reduces load and material costs. do.

A vertical shaft pump according to a first aspect of the present invention is a pull-out type vertical shaft pump, which houses a main shaft and is integral with a discharge elbow, one end of which communicates with an external casing and the other end of which communicates with a discharge pipe. an internal casing having a structure that allows the main shaft to be pulled out; an intermediate bearing provided inside the internal casing between the main shaft and the inner circumferential surface of the internal casing and located inside the discharge elbow; a bearing support rib whose other end is connected to the outer peripheral surface of the inner casing at a position facing the intermediate bearing with the inner casing in between, and whose other end is connected to the inner peripheral surface of the discharge elbow; Equipped with.

A vertical shaft pump according to a second aspect of the present invention is the vertical shaft pump according to the first aspect, wherein a first inspection port is provided in the discharge elbow so that the intermediate bearing can be inspected. A first inspection port lid is provided to cover the first inspection port in an openable and closable manner.

A vertical shaft pump according to a third aspect of the present invention is the vertical shaft pump according to the second aspect, wherein a second inspection port is provided in the internal casing so that the intermediate bearing can be inspected, and the A second inspection port lid is provided to cover the second inspection port in an openable and closable manner.

A vertical shaft pump according to a fourth aspect of the present invention is the vertical shaft pump according to any one of the first to third aspects, further comprising a receiving plate fixed to the inner circumferential surface of the discharge elbow, and further comprising a receiving plate fixed to the inner circumferential surface of the discharge elbow. The bearing support ribs are in contact with the support plate so that the direction in which the surface of the support plate and the bearing support ribs extend is substantially perpendicular.

A vertical shaft pump according to a fifth aspect of the present invention is the vertical shaft pump according to the fourth aspect, further comprising an elastic body fixed to the other end of the bearing support rib.

A vertical shaft pump according to a sixth aspect of the present invention is the vertical shaft pump according to the fifth aspect, which includes a flat plate fixed to the other end of the bearing support rib and a bearing support contact that contacts the receiving plate. The elastic body is fixed to the other end of the bearing support rib while being sandwiched between the flat plate and the bearing support contact plate.

A vertical shaft pump according to a seventh aspect of the present invention is the vertical shaft pump according to any one of the first to sixth aspects, and includes a discharge bowl connected to the internal casing, and includes an installation or a A notch of a size such that the discharge bowl does not interfere with the receiving plate during lifting is provided in a part of the circumference of the upper surface of the discharge bowl.

A vertical shaft pump according to an eighth aspect of the present invention is the vertical shaft pump according to any one of the first to seventh aspects, and has three bearing support ribs, and the bearing support ribs are arranged in a vertical direction. It is arranged so that it is divided into three prongs.

A vertical shaft pump according to a ninth aspect of the present invention is the vertical shaft pump according to the eighth aspect, in which the bearing support rib is provided so as to avoid the discharge port of the discharge elbow.

A vertical shaft pump according to a tenth aspect of the present invention is the vertical shaft pump according to any one of the first to ninth aspects, wherein the extending direction of the bearing support rib and the contact position with the external casing are The rib is vertically shifted from the contact position with the inner casing.

A vertical shaft pump according to an eleventh aspect of the present invention is the vertical shaft pump according to any one of the first to tenth aspects, and includes a discharge bowl connected to the internal casing, and a The impeller casing is supported by a support provided on the inner surface of the outer casing.

According to one aspect of the present invention, by adopting a structure in which the vibration of the intermediate bearing is received by the outer casing instead of the inner casing, it is possible to reduce the strength required of the inner casing. This makes it possible to reduce the weight of the internal casing and reduce load and material costs. Further, according to one aspect, by providing a structure in which the rotating body can be pulled out integrally with the internal casing, recovery response time is shortened and maintenance management performance is improved. Therefore, it is possible to shorten recovery response time, facilitate maintenance and management, and reduce load and material costs. Furthermore, according to one aspect, ease of inspection is improved by providing inspection ports in the inner casing and the outer casing.

It is a schematic sectional view of the vertical shaft pump concerning a 1st embodiment. FIG. 1A is a view taken along the line AA in FIG. 1A. FIG. 1B is a vertical cross-sectional view of region R2 in FIG. 1B. FIG. 1C is a view taken along the line BB in FIG. 1C. FIG. 7 is a schematic cross-sectional view of the rotating body and the internal fixing part being pulled out. FIG. 2A is a view taken along the line CC in FIG. 2A. FIG. 3 is a schematic diagram showing an example of a method of injecting lubricating water into an underwater bearing. 1A is a view taken along the line AA in FIG. 1A, showing a first example of the arrangement of bearing support ribs. FIG. 1A is a view taken along the line AA in FIG. 1A, showing a second example of the arrangement of bearing support ribs. FIG. 1A is a view taken along the line AA in FIG. 1A, showing a third example of the arrangement of bearing support ribs. FIG. 1A is a view taken along the line AA in FIG. 1A, showing a fourth example of the arrangement of bearing support ribs. FIG. FIG. 7 is a schematic cross-sectional view showing a first modification of the arrangement of bearing support ribs. FIG. 7 is a schematic cross-sectional view showing a second modification of the arrangement of bearing support ribs. It is a schematic sectional view of a vertical shaft pump showing the position of a 1st inspection port. It is a schematic sectional view of a vertical shaft pump showing the position of a 2nd inspection port. FIG. 6B is an enlarged view of region R21 in FIG. 6B. FIG. 6B is a view taken along the line DD in FIG. 6B. It is a schematic sectional view of the vertical shaft pump concerning a 2nd embodiment. FIG. 7 is a schematic diagram showing dimensions of a vertical shaft pump according to a second embodiment. It is a schematic diagram for showing the notch of a discharge bowl.

Each embodiment will be described below with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of well-known matters or redundant explanations of substantially the same configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

Each embodiment provides a low-cost pump that enables quick recovery in the event of a pump failure, is easy to maintain, and is a vertical pump device that pumps water in a suction tank installed in a river or the like. do. Specifically, by adopting a structure in which the vibration of the bearing is received by the outer casing instead of the inner casing, the strength required of the inner casing can be reduced. Furthermore, by adopting a structure in which the load of the inner casing is transferred to the outer casing, the strength required of the inner casing can be reduced. This makes it possible to reduce the weight of the internal casing and reduce load and material costs. Therefore, it is possible to shorten recovery response time, facilitate maintenance and management, and reduce load and material costs. Each embodiment will be described below.

<First embodiment>
FIG. 1A is a schematic cross-sectional view of a vertical shaft pump according to a first embodiment. FIG. 1B is a view taken along the line AA in FIG. 1A. FIG. 1C is a longitudinal cross-sectional view of region R2 in FIG. 1B. FIG. 1D is a view taken along the line BB in FIG. 1C.

As shown in FIG. 1A, the vertical shaft pump 1 is a pull-out type vertical shaft pump. As shown in FIG. 1A, the vertical shaft pump 1 includes an outer casing 11, an inner casing 12 provided inside the outer casing 11, a main shaft 13 housed inside the inner casing 12, and an end portion of the main shaft 13 connected to the outer casing 11. It includes an impeller 14 and a discharge bowl 15 connected to the inner casing 12. Here, the outer casing 11 is sometimes called a column, and the inner casing 12 is sometimes called an inner shell.

Furthermore, the vertical shaft pump 1 includes a discharge pipe 31 , a discharge elbow 16 whose one end communicates with the outer casing 11 and the other end with the discharge pipe 31 , and a main shaft 13 and an inner circumferential surface of the inner casing 12 inside the inner casing 12 . An intermediate bearing 20 is provided between the two. In the example of FIG. 1A, the discharge elbow 16 is the outer casing with a height H0 or more. Here, the intermediate bearing 20 is located inside the discharge elbow 16. Specifically, for example, the intermediate bearing 20 has a height H1 or more of the lower end of the discharge port of the discharge elbow 16 (i.e., the height of the lower end of the inlet of the discharge pipe 31), and a height of the upper end of the discharge port (i.e., the height of the lower end of the discharge pipe 31). The height of the upper end of the entrance) is located within a height range of H2 or less.

Further, the vertical shaft pump 1 has one end connected to the outer peripheral surface of the internal casing 12 at a position facing the intermediate bearing 20 with the internal casing 12 in between, and the other end connected to the inner peripheral surface of the discharge elbow 16. The bearing supporting ribs 171, 172, and 173 are provided. Furthermore, the vertical shaft pump 1 includes a discharge elbow upper cover 18.

In conventional pull-out type vertical shaft pumps, if the overall length of the pump is long and an intermediate bearing needs to be installed, the intermediate bearing is installed in the inner shell (inner casing). Therefore, the inner shell must be designed to be strong enough to withstand vibrations, which increases cost and weight.

On the other hand, in the first embodiment, as shown in region R1 in FIG. As a result, it has a structure in which the load is placed on the outer casing 11 side.

Furthermore, in the first embodiment, as shown in FIGS. 1A and 1B, the bearing support ribs 171, 172, and 173 are connected to the outer casing 11, so that the vibration of the intermediate bearing 20 is received by the outer casing 11.

At this time, in order to ensure sufficient strength of the bearing support rib 17 and to reduce the weight of the internal casing 12, the bearing support ribs 171, 172, and 173 are arranged within the vertical range of the discharge elbow 16 (for example, the discharge pipe 31 The bearing supporting ribs 171, 172, and 173 are extended in three different directions as shown in FIG. 1B. are doing. As described above, there are three bearing support ribs, and the bearing support ribs are arranged so as to be divided into three when viewed in the vertical direction.

As shown in FIG. 1A, when the intermediate bearing 20 in the underwater part is installed inside the discharge elbow 16 (for example, at a position above the lower end of the discharge pipe 31 and below the upper end of the discharge pipe 31), the vibration of the intermediate bearing 20 is suppressed. The supporting bearing support ribs 171, 172, and 173 have a structure that extends horizontally and contacts the outer casing 11. Further, as shown in FIGS. 1A and 1B, the bearing support ribs 171, 172, and 173 are provided so as to avoid the discharge port of the discharge elbow 16 (that is, the inlet of the discharge pipe 31).

Since the outer casing 11 (column) in contact with the bearing support rib 17 is curved, a gap is likely to occur between the outer casing 11 and the bearing support rib 17 . It is assumed that this gap increases the vibration of the shaft, making it impossible to suppress the vibration. Therefore, bearing support contact plates 23 and 24 (for example, metal plates) are provided at the ends of the bearing support ribs on the external casing 11 (column) side, and a receiving plate 25 is provided at the end of the bearing support contact plates 23 and 24. The structure is such that the gap between the outer casing 11 and the outer casing 11 is reduced.
Further, an elastic body 22 (for example, a rubber plate, etc.) is employed at the tip of the bearing support rib 17, and its elasticity makes vibration absorption efficient.

Since the bearing support ribs 171, 172, and 173 have the same structure, the bearing support rib 173 will be described as a representative among the bearing support ribs 171, 172, and 173 using FIG. 1C.
As shown in FIG. 1C, the vertical shaft pump 1 further includes a receiving plate 25 fixed to the inner peripheral surface of the discharge elbow 16. As shown in FIG. 1B, the bearing support rib 173 is in contact with the support plate 25 such that the direction in which the surface of the support plate 25 and the bearing support rib 173 extend is substantially perpendicular when viewed in the vertical direction.

As shown in FIG. 1C, the vertical shaft pump 1 further includes an elastic body 22 fixed to the other end of the bearing support rib 173. Further, as shown in FIG. 1C, the vertical shaft pump 1 includes a flat plate 21 fixed to the other end of the bearing support rib 173, and bearing support contact plates 23 and 24 that are in contact with the receiving plate 25. The elastic body 22 is fixed to the other end of the bearing support rib 173 while being sandwiched between the flat plate 21 and the bearing support contact plates 23 and 24. Further, as shown in FIG. 1D, bearing support contact plates 23 and 24 are fixed to the elastic body 22.

<Other aspects>
The receiving plate 25 and the bearing support contact plates 23 and 24 may be curved to match the shape of the outer casing 11. The receiving plate 25 is basically made of metal, but may also be made of a composite resin material having strength. Further, the receiving plate 25 may have a removable structure.

FIG. 2A is a schematic cross-sectional view of the rotating body and the internal fixing part being pulled out. FIG. 2B is a view taken along the line CC in FIG. 2A. As shown in FIG. 2A, for example, by connecting a chain C1 to the end of the main shaft 13, hooking the chain C1 to a hook F, and lifting the hook F, the rotating body and the internal fixed part can be pulled out. Here, the rotating body includes a main shaft 13 and an impeller 14. The internal fixing part includes an internal casing 12 and a discharge bowl 15.

FIG. 3 is a schematic diagram showing an example of a method of injecting lubricating water into an underwater bearing. As shown in FIG. 3, for example, the lubricating water for the intermediate bearing 20 may be externally injected with fresh water or filtered water from the shaft sealing portion 26. Here, as shown in FIG. 3, the shaft seal 26 is provided around the main shaft 13 at the end of the main shaft 13, and a pipe 30 communicating with the shaft seal 26 may be provided. As shown by arrow A13, fresh water or filtered water may pass through the piping 30 and be supplied to the shaft seal portion 26. Here, fresh water is, for example, tap water, industrial water, etc., and filtered water is water that is taken from a river and has foreign substances removed using a sand separator or an auto strainer.

Note that, as shown in FIG. 3, the lubricating water of the intermediate bearing 20 may be filled by a self-filling method. As shown in FIG. 3, the self-water injection method means that the liquid discharged by the vertical shaft pump 1 is discharged, branched from the elbow 16 or the discharge pipe 31, and then passed through the sand separator 33 (or auto-strainer) and then from the shaft sealing part 26. This is to inject water. In FIG. 3, as an example, a pipe 32 is provided, one end of which communicates with a discharge pipe 31, and the other end of this pipe 32 communicates with a sand separator 33. Thereby, the own liquid discharged by the vertical shaft pump 1 is supplied to the sand separator 33 as shown by arrow A11. Further, a pipe 34 is provided, one end of which communicates with the discharge port of the sand separator 33, and the other end of this pipe 34 communicates with the shaft seal portion 26. As a result, water discharged from the sand separator 33 is supplied to the shaft seal portion 26 as shown by arrow A12.

<Example of arrangement of bearing support ribs>
Next, an example of the arrangement of bearing support ribs will be explained. FIG. 4A is a view taken along the line AA in FIG. 1A, showing a first example of the arrangement of bearing support ribs. As shown in FIG. 4A, in the AA arrow view of FIG. 1A, the angles θ1, θ2, and θ3 that the bearing support ribs 171, 172, and 173 make with each other are the same, and the bearing support rib installation angles are equal. . Here, the angle formed by the bearing support ribs 171 and 172 is θ1, the angle formed by the bearing support ribs 172 and 173 is θ2, and the angle formed by the bearing support ribs 173 and 171 is θ3.

FIG. 4B is a view taken along the line AA in FIG. 1A, showing a second example of the arrangement of bearing support ribs. The bearing support rib installation angles are not uniform (θ1≠θ2≠θ3).
FIG. 4C is a view taken along the line AA in FIG. 1A, showing a third example of the arrangement of bearing support ribs. The bearing support rib installation accuracy θ3 is 180 degrees.
FIG. 4D is a view taken along the line AA in FIG. 1A, showing a fourth example of the arrangement of bearing support ribs. The angle θ3 formed by the bearing support ribs 173 and 171 is 60 degrees.

<Other aspects>
Note that the installation angle of the bearing support rib may be varied depending on the diameter of the discharge pipe 31.

FIG. 5A is a schematic cross-sectional view showing a first modification of the arrangement of bearing support ribs. FIG. 5B is a schematic cross-sectional view showing a second modification of the arrangement of bearing support ribs.
As shown in FIGS. 5A and 5B, when the intermediate bearing 20 in the underwater part is installed inside the discharge elbow 16 (for example, at a position above the lower end of the discharge pipe and below the upper end of the discharge pipe), the vibration of the intermediate bearing 20 is supported. Even if the extending direction of the bearing support ribs 171b to 173b or 171c to 173c and the contact position with the outer casing 11 are shifted in the vertical direction compared to the contact position of the bearing support ribs 171b to 173b or 171c to 173c with the inner casing, good.

FIG. 6A is a schematic cross-sectional view of the vertical shaft pump showing the position of the first inspection port. FIG. 6B is a schematic cross-sectional view of the vertical shaft pump showing the position of the second inspection port. FIG. 6C is an enlarged view of region R21 in FIG. 6B. FIG. 6D is a view taken along the line DD in FIG. 6B.
With conventional vertical pumps, when inspecting the intermediate bearing in the underwater part, it is necessary to lift the pump and disassemble it. Although it is necessary to pull up the rotating body and internal fixed part in a pull-out type pump as well, in this embodiment, the intermediate bearing 20 in the underwater part is provided in the height range of the discharge elbow 16, so a first inspection port 41a is provided. This makes it possible to easily inspect the intermediate bearing 20 from the pump installation floor. As described above, the discharge elbow 16 has a first inspection port 41 formed in the first inspection port 44 so that the intermediate bearing 20 can be inspected. A first inspection port cover 43 that covers the first inspection port 41 in an openable and closable manner is provided in the first inspection account 44 . At this time, the first inspection port may be installed anywhere above, below, left or right with respect to the installation positions of the bearing support ribs 171 to 173.

A second inspection port 42 is also formed in the inner casing 12 in a second inspection port 422 so that the intermediate bearing 20 can be inspected, and a second inspection port cover 421 that covers the second inspection port 42 so as to be openable and closable is provided in the second inspection port 422 . By providing the second inspection account 422, the intermediate bearing 20 can be easily inspected. Here, the size of the inspection port is large enough to allow an endoscope to enter along arrow A21 in FIG. 6B.

In this way, with conventional pumps, it is difficult to inspect the intermediate bearing while it is installed, but the intermediate bearing is installed at a position between the lower end and the upper end of the discharge pipe, and inspection holes are provided in the outer casing 11 and the inner casing 12. This makes it possible to inspect the vertical shaft pump 1 from the installation floor without lifting it up.

As described above, the vertical shaft pump 1 according to the first embodiment is a pull-out type vertical shaft pump,
A discharge elbow 16 having one end communicating with the outer casing 11 and the other end communicating with the discharge pipe 31; an inner casing 12 which houses the main shaft 13 and has a structure that allows the main shaft to be pulled out as a unit; An intermediate bearing 20 is provided inside between the main shaft 13 and the inner circumferential surface of the internal casing 12 and is located inside the discharge elbow 16, and an intermediate bearing 20 is located at a position where one end faces the intermediate bearing 20 with the internal casing 12 in between. Bearing support ribs 171 to 173 are connected to the outer peripheral surface of the inner casing 12 and have the other end connected to the inner peripheral surface of the discharge elbow 16.

According to this configuration, the vibration of the intermediate bearing is received by the outer casing instead of the inner casing, thereby making it possible to reduce the strength required of the inner casing. This makes it possible to reduce the weight of the internal casing and reduce load and material costs. Further, according to one aspect, by providing a structure in which the rotating body can be pulled out integrally with the internal casing, recovery response time is shortened and maintenance management performance is improved.

<Second embodiment>
Next, a second embodiment will be described.
FIG. 7 is a schematic cross-sectional view of a vertical shaft pump according to a second embodiment. As shown in FIG. 7, the vertical shaft pump 101 includes an external casing 111, a discharge elbow 116 connected to the external casing 111 via flanges 182 and 183, an internal casing 112 provided inside the external casing 111, and an internal A main shaft 113 housed inside the casing 112, an impeller 114 connected to the end of the main shaft 113, a discharge bowl 115 connected to the internal casing 112, a suction bell 119 connected to the discharge bowl 115, and the main shaft 113. It is provided with an external bearing 181 that supports the. Here, the outer casing 111 is sometimes called a column, and the inner casing 112 is sometimes called an inner shell. The main shaft 113 is rotated by a drive machine 141.
Since the internal casing 112 is suspended, the load is received by the external bearing 181 (thrust bearing).

Furthermore, the vertical shaft pump 101 includes a discharge pipe 131 , a discharge elbow 116 whose one end communicates with the outer casing 111 and the other end with the discharge pipe 131 , and a main shaft 113 and an inner peripheral surface of the inner casing 112 inside the inner casing 112 . An intermediate bearing 120 is provided between the two. Here, the intermediate bearing 120 is located inside the discharge elbow 116. Specifically, for example, the intermediate bearing 120 is located in a height range that is greater than or equal to the lower end of the discharge port of the discharge elbow 116 (i.e., the lower end of the inlet of the discharge pipe 131) and less than or equal to the upper end of the discharge port (i.e., the upper end of the inlet of the discharge pipe 131). To position.

A protrusion 130 is provided on the side surface of the discharge bowl 115 , and the protrusion 130 is hooked onto and supported by a support 132 provided at an end of the outer casing 111 .

As in the first embodiment, three bearing support ribs 171, 172, 173 are provided, and a receiving plate 125 fixed to the inner peripheral surface of the discharge elbow 116 is provided. Similar to the first embodiment, the bearing support ribs 171, 172, 173 are supported so that the surface of the support plate 125 and the direction in which the bearing support ribs 171, 172, 173 extend are approximately perpendicular to each other when viewed in the vertical direction. It is in contact with the plate 125. The detailed structure of this fixing is the same as in the first embodiment, so its explanation will be omitted.

FIG. 8A is a schematic diagram showing dimensions of the vertical shaft pump according to the second embodiment. FIG. 8B is a schematic diagram showing a cutout of the discharge bowl. In FIG. 8A, the outer periphery of the outer casing, the outer periphery of the discharge bowl, the outer periphery of the end of the suction bell, and the inner periphery of the suction bell are shown.

If a receiving plate 125 (for example, a metal plate) is installed on the column, the upper end of the discharge bowl 115 will interfere when the inner casing is pulled out. Therefore, it is necessary to reduce the diameter of the upper end of the discharge bowl 115 to an extent that there is no interference, but this increases the gap between the column and the upper end of the bowl part, which may cause leakage flow and reduce pump efficiency.

On the other hand, in order to suppress the reduction in efficiency as much as possible, the discharge bowl 115 has a structure in which a portion interfering with the receiving plate 125 is locally cut out. Specifically, as shown in FIG. 8B, cutouts 161, 162, and 163 are sized so that the discharge bowl 115 does not interfere with the three receiving plates 125 when the discharge bowl 115 is installed or pulled up. It is provided on a part of the circumference of the upper surface of the bowl 115.

As described above, the present invention is not limited to the above-described embodiments as they are, and in the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. Moreover, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, components from different embodiments may be combined as appropriate.

1, 101 Vertical shaft pump 11, 111 External casing 112 Internal casing 113 Main shaft 114 Impeller 115 Discharge bowl 116 Discharge elbow 119 Suction bell 12 Internal casing 120 Intermediate bearing 121 Impeller casing 125 Reception plate 13 Main shaft 130 Discharge pipe 131 Discharge pipe 132 Support part 14 Impeller 15 Discharge bowl 16 Discharge elbow 17 Bearing support ribs 171, 172, 173 Bearing support ribs 18 Discharge elbow upper cover 21 Flat plate 22 Elastic body 23, 24 Bearing support contact plate 25 Receiving plate 26 Shaft sealing part 31 Discharge Pipe 32 Piping 33 Sand separator 34 Piping 41a First inspection port 42 Second inspection window 421 Second inspection port 43a First inspection window

Claims (11)

It is a pull-out type vertical shaft pump,
a discharge elbow having one end communicating with the outer casing and the other end communicating with the discharge pipe;
an internal casing that accommodates the main shaft and has a structure that allows the main shaft to be pulled out as a unit;
an intermediate bearing provided inside the internal casing between the main shaft and the inner peripheral surface of the internal casing and located inside the discharge elbow;
a bearing supporting rib having one end connected to the outer circumferential surface of the inner casing at a position facing the intermediate bearing with the inner casing in between, and the other end connected to the inner circumferential surface of the discharge elbow; ,
A vertical shaft pump equipped with A first inspection port is provided in the discharge elbow so that the intermediate bearing can be inspected, and a first inspection port cover is provided to cover the first inspection port so as to be openable and closable. Vertical shaft pump as described. A second inspection port is provided in the inner casing so that the intermediate bearing can be inspected, and a second inspection port cover is provided to cover the second inspection port in an openable and closable manner. vertical shaft pump. further comprising a receiving plate fixed to the inner circumferential surface of the discharge elbow,
Any one of claims 1 to 3, wherein the bearing support rib is in contact with the support plate such that the direction in which the surface of the support plate and the bearing support rib extend are substantially perpendicular when viewed in the vertical direction. Vertical shaft pump described in . The vertical shaft pump according to claim 4, further comprising an elastic body fixed to the other end of the bearing support rib. a flat plate fixed to the other end of the bearing support rib;
a bearing support contact plate in contact with the receiving plate;
further comprising;
The vertical shaft pump according to claim 5, wherein the elastic body is fixed to the other end of the bearing support rib while being sandwiched between the flat plate and the bearing support contact plate. a discharge bowl connected to the inner casing;
According to claim 4, a notch of a size such that the discharge bowl does not interfere with the receiving plate when the discharge bowl is installed or pulled up is provided in a part of the circumference of the upper surface of the discharge bowl. vertical shaft pump. having three bearing support ribs;
The vertical shaft pump according to claim 1, wherein the bearing support rib is arranged so as to be divided into three prongs when viewed in the vertical direction. The vertical shaft pump according to claim 8, wherein the bearing support rib is provided so as to avoid the discharge port of the discharge elbow. The vertical shaft pump according to claim 1, wherein the extending direction of the bearing support rib and the contact position with the outer casing are vertically shifted from the contact position of the bearing support rib with the inner casing. a discharge bowl connected to the inner casing;
The vertical shaft pump according to claim 1, wherein the impeller casing connected to the discharge bowl is supported by a support part provided on the inner surface of the outer casing.