JP2002195185A - Vertical shaft pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical shaft pump capable of setting a height of discharge center of a discharge elbow 30 to a low height, arranging a reinforcing member simply, and obtaining desired mechanical strength simply. SOLUTION: In this vertical shaft pump provided with a reduction gear 22 on an external wall of the discharge elbow 30, a cross section of the discharge elbow 30 is formed into a rectangular shape formed by two opposing and vertical side walls 34a, 34a and two curved surfaces crossing the side walls orthogonally using a steel plate, and a curvature radius of a central line of a flow passage on a face parallel with the side walls 34a, 34a is reduced to set the height of discharge center to the low height. Moreover, the reinforcing member is arranged as a rib on the side walls 34a, 34a of the discharge elbow 30 to obtain mechanical strength for supporting a weight of the reduction gear 22 and vertical downward load applied on a rotary shaft by pump operation. The height of discharge center of the discharge elbow 30 is set so that it agrees with a height of discharge center of an existing horizontal shaft pump to install this vertical shaft pump instead of the existing horizontal shaft pump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft pump capable of setting the height of a discharge center of a discharge elbow low.

[0002]

2. Description of the Related Art In a drainage pump station, a horizontal axis pump or a vertical axis pump has conventionally been appropriately adopted as a drainage pump. This, in the conventional, respectively also the horizontal axis pumps Vertical shaft pump is also because they have merits and demerits. That is, in the case of the horizontal axis pump, the building to be installed may have a one-floor structure,
The building is low enough, but it requires a filling operation to fill the pumping pipe and pump casing at startup.
It takes 5 to 10 minutes or more to start up for the water filling operation. On the other hand, vertical pumps can be operated in the air and can be started quickly, but the building where they are installed requires a two-floor structure, which must be expensive, and the construction cost is high. Become.

However, in recent years, with the progress of urbanization,
Much rainwater tends to flow into the drainage station as sewage without being absorbed by the ground. Therefore, the rainfall causes a sudden increase in the suction tank of the drainage pump station. As a result, in the drainage station where the horizontal axis pump is installed, quick start cannot be performed and the function cannot be sufficiently performed. In such a drainage pump station, there is a strong demand to replace the existing horizontal pump with a vertical pump that can be started quickly. However, as described above, the height of the building required for installation is different between the horizontal axis pump and the vertical axis pump, and the building has to be replaced.

[0004] The present applicant has previously disclosed in Japanese Patent Laid-Open No. 11-19379.
No. 9 proposes a vertical pump. In this device, a speed reducer is provided on the outer wall of a discharge elbow of a vertical shaft pump, and an input drive shaft projects horizontally from the speed reducer. The drive unit that is drivingly connected to the input drive shaft and the discharge elbow can be arranged on the same floor, and the building may have a single-floor structure, and may be the same as the horizontal axis pump.

Therefore, when replacing the existing horizontal shaft pump with a vertical shaft pump, if the technique proposed in the above-mentioned Japanese Patent Application Laid-Open No. H11-193799 is adopted for the vertical shaft pump, the existing building can be used and economical. It is a target. From these viewpoints, FIG. 5 shows an example of a structure in which the horizontal shaft pump is replaced with the previously proposed vertical shaft pump. In FIG. 5, a pump pipe 12, an impeller casing 14, and a suction bell 16
The suction bell 1 is installed integrally in the suction water tank 18.
6 is open. Also, a circular cross section of the discharge and the outer wall to the reduction gear 22 of the elbow 20 disposed on top of riser pipe 12 is attached, the drive connected to the reduction gear 22 as appropriate the rotation axis to protrude through the outer wall in the vertical direction Is done. A drive (not shown) is drive-coupled to an input drive shaft 24 projecting horizontally from the speed reducer 22 and disposed on the floor 10. Further, the discharge port of the discharge elbow 20 is connected to an existing discharge valve 28 via an S-shaped short tube 26.

[0006]

Generally, a vertical shaft pump and a horizontal shaft pump having the same diameter are different in height from the floor 10 at the discharge center. As an example, the height of the discharge center of a 1500 mm diameter vertical axis pump is usually about 1700 mm, whereas the height of the discharge center of a 1500 mm diameter horizontal axis pump is usually about 1300 mm, and 400 m
A difference of about m occurs. Therefore, in the structure shown in FIG.
It is inevitable to provide a short tube 26 to absorb the deviation in the height of the discharge center.

The radius of curvature of the flow path of the discharge elbow 20 is used as a convenient way to match the height of the discharge center of the vertical pump with the height of the discharge center of the horizontal pump without using the S-shaped short pipe 26. Should be smaller. However, when a cylindrical body having a circular cross section is formed with a small radius of curvature, it is difficult to form the outer wall inside the bend smoothly, and it is difficult to form the outer wall with a significantly small radius of curvature.

If the discharge elbow 20 having a circular cross section is made of a steel pipe, as shown in FIG. 6, a plurality of short pipes whose end faces are obliquely cut are connected and welded. In order to make the flow in the flow path smooth, it is sufficient to connect a large number of short pipes. However, the number of steps of cutting the end face of the pipe obliquely and welding are increased, which complicates the production. Further, as shown in FIG. 6, if only a small number of three pipes are connected, the manufacture is simple, but the flow in the flow path is not smooth.

Further, as shown in FIG. 5, when a speed reducer is attached to the discharge elbow 20, the weight of the speed reducer 22 and a vertically downward load generated on the rotating shaft due to the pump operation are applied to the discharge elbow 20. Therefore, in order to withstand such weight and load, it is necessary to provide a reinforcing member (not shown) on the discharge elbow 20 to increase the mechanical strength. However, the discharge elbow 20 has a circular cross-section, and its outer cross-sectional shape is also circular, and it is difficult to attach a reinforcing member as a rib or the like.

The present invention has been made to improve the prior art as described above, and has as its object to provide a vertical shaft pump capable of setting the height of the discharge center of the discharge elbow low. It is another object of the present invention to provide a vertical shaft pump in which a reinforcing member can be easily attached to a discharge elbow so that desired mechanical strength can be easily achieved.

[0011]

In order to achieve the above object, a vertical shaft pump according to the present invention is configured such that a speed reducer is drivingly connected to a rotary shaft that projects vertically through an outer wall of a discharge elbow, and is connected to the speed reducer. A vertical shaft pump attached to the outer wall and horizontally projecting an input drive shaft of the speed reducer, wherein the discharge elbow has a rectangular cross section including two vertical side walls opposed to each other and is parallel to the side walls. The height of the discharge center is set low by reducing the radius of curvature of the center line of the flow path on the surface.

The discharge elbow may be constructed by combining two members capable of dividing the discharge elbow into upper and lower parts.

The discharge elbow may be formed by welding a steel plate.

Further, a reinforcing member is provided as a rib on the side wall of the discharge elbow, and a mechanical strength for supporting the weight of the speed reducer and a vertically downward load applied to the rotating shaft by a pump operation. Can be obtained.

Further, the height of the discharge center of the discharge elbow may be set to be equal to the height of the discharge center of the existing horizontal axis pump, and may be installed in place of the horizontal axis pump. .

[0016]

FIG. 1 shows a first embodiment of the present invention.
To be described with reference to FIG. FIG. 1 is an overall structural view of a vertical pump according to the present invention. FIG. 2 is a longitudinal sectional view showing a structure of a discharge elbow having a rectangular cross section of a main part of FIG. FIG.
Is a diagram illustrating that the height of the discharge center of a discharge elbow having a rectangular cross section of the present invention can be set lower than the height of the discharge center of a conventional discharge elbow having a circular cross section,
(A) shows a discharge elbow with a rectangular cross section, and (b) shows a discharge elbow with a circular cross section. 1 to 3,
Members that are the same as or equivalent to those shown in FIGS. 5 and 6 are given the same reference numerals, and redundant description is omitted. Note that FIG.
In the figure, the illustration of the speed reduction mechanism in the speed reduction device 22 is omitted.

In the vertical pump according to the present invention shown in FIG.
The difference from the conventional vertical pump shown in FIG. 5 lies in the following structure. First, a discharge elbow 30 having a rectangular cross section is provided so as to overlap with the pumping pipe 12, and the discharge port thereof is connected to the discharge valve 28 through the straight pipe 32. The discharge elbow 30 having a rectangular cross section includes a rectangular elbow 34 and modified pipes 36 and 38 provided on the suction side and the discharge side, respectively. The deformed tubes 36 and 38 have a rectangular elbow 34 having a rectangular cross section,
The water pipe 12 and the straight pipe 32 having a circular cross section are communicated with each other. In the present invention, a rectangle means a quadrilateral in which four corners are each a right angle, and is used as including both a square and a rectangle.

The rectangular elbows 34 are opposed to each other in parallel.
And three vertical side walls 34a, 34a.
a, 34a and two curved surfaces 34b and 34c orthogonal thereto.
Thereby, a channel having a rectangular cross section is formed. Then, the reduction gear 22 is appropriately attached to the outer wall composed of the curved surface 34b having a large radius of curvature. Therefore, the rectangular elbow 3 in the present invention
4, as shown in FIG. 3A, the radius of curvature of the curved surfaces 34 b and 34 c can be set arbitrarily, and the radius of curvature R
1, the height C1 of the ejection center can be set appropriately. On the other hand, in the conventional discharge elbow 20 having a circular cross section, as shown in FIG. 3B, the curvature deformation R2 of the center line of the flow path cannot be arbitrarily set. Cannot be set arbitrarily. This is because, if a cylindrical body having a circular cross section is formed with a small radius of curvature, it is difficult to smoothly curve the outer wall inside the bend. Thus, for example, a conventional discharge elbow 20 having a circular cross-section is 1500 mm in diameter and the height of the discharge center is 1700 mm. In the rectangular elbow 34 described above, the height of the discharge center can be set to 1300 mm, and can match the height of the discharge center of the conventional horizontal axis pump. Therefore, as shown in FIG. 1, instead of using an existing horizontal shaft pump, an S-shaped short tube 26 as in a conventional example is used,
A vertical pump can be installed.

Further, the rectangular elbow 34 of the present invention can be easily manufactured by welding a steel plate. This is easier than manufacturing by welding the conventional steel pipe shown in FIG. In addition, the rectangular elbow 34 has vertical side walls 34a, 34a, and by appropriately arranging a reinforcing member as a rib on these, the load on the rotating shaft due to the weight of the reduction gear 22 and the pump operation is reduced. Thus, a structure having sufficient mechanical strength can be easily obtained.

Incidentally, in the discharge elbow 2 manufactured by welding a conventional steel pipe shown in FIG. 6, in order to obtain a mechanical strength capable of withstanding the load generated on the rotating shaft by the operation of the reduction gear 22 and the pump. As an example, the reinforcing member must be assembled so as to surround the discharge elbow 20, and it is not sufficient to simply attach the reinforcing member to the outer wall of the discharge elbow 20. Therefore, it was complicated to obtain a structure having a desired strength.

Next, a second embodiment of the vertical pump according to the present invention will be described with reference to FIG. FIG. 4 is an exploded perspective view of a discharge elbow having a rectangular cross section of a main part of a second embodiment of the vertical pump according to the present invention.

In FIG. 4, the discharge elbow 40 is constructed so that it can be divided into an upper elbow portion 42 and an elbow lower portion 44 at the vertical center of the discharge in the horizontal direction. A flange is provided on the divided surface of the elbow upper portion 42 and the elbow lower portion 44, and when assembled, is joined in a water-tight manner with a sealing material or the like provided on the flange. Then, the speed reducer 22 is appropriately attached to the elbow upper portion 42.

Such a discharge elbow 4 which can be divided into upper and lower parts.
In the case of 0, the weight of each member can be reduced, and the crane capacity required for installing and disassembling the vertical shaft pump is small.

In the above embodiment, the discharge elbows 30 and 40 having a rectangular cross section have been described as being manufactured from a steel plate. However, the present invention is not limited to this. Of course. The cross-sectional area of the discharge elbows 30 and 40 does not necessarily have to be the same as the cross-sectional area of the flow passages of the pumping pipe 12 and the straight pipe 32. If a desired height of the discharge center can be set, The cross-sectional area of the flow path may be increased, and the cross-sectional shape is not limited to a square but may be a rectangle.

[0025]

As described above, since the vertical shaft pump of the present invention is constituted, the following special effects can be obtained.

In the vertical pump according to the first aspect, the height of the discharge center of the discharge elbow can be set lower than that of the conventional discharge elbow having a circular cross section.

In the vertical pump according to the second aspect, since the discharge elbow can be divided into upper and lower parts, the crane capacity required for installation and disassembly is small.

In the vertical pump according to the third aspect, since the discharge elbow can be manufactured by welding a steel plate, the discharge elbow can be manufactured using a simple sheet metal processing machine or the like, which is suitable for small-quantity production.

In the vertical pump according to the fourth aspect, a reinforcing member can be easily provided as a rib or the like on a vertical flat side wall of the discharge elbow to increase the mechanical strength. The mechanical strength sufficient to withstand the weight of the reduction gear and the load on the rotating shaft due to the pump operation can be easily obtained.

In the vertical shaft pump according to the fifth aspect, the height of the discharge center of the discharge elbow having a rectangular cross section is set to coincide with the existing horizontal shaft pump, so that the horizontal shaft pump can be replaced. The vertical shaft pump of the present invention can be installed relatively economically. Moreover, unlike the related art, an S-shaped short tube is not required, and the appearance is excellent.

[Brief description of the drawings]

FIG. 1 is an overall structural view of a vertical pump according to the present invention.

FIG. 2 is a longitudinal sectional view showing a structure of a discharge elbow having a rectangular cross section of a main part of FIG. 1;

FIG. 3 is a diagram illustrating that the height of the discharge center of a discharge elbow having a rectangular cross section according to the present invention can be set lower than the height of the discharge center of a conventional discharge elbow having a circular cross section; (A) shows a discharge elbow with a rectangular cross section, and (b) shows a discharge elbow with a circular cross section.

FIG. 4 is an exploded perspective view of a discharge elbow having a rectangular cross section of a main part of a second embodiment of the vertical pump according to the present invention.

FIG. 5 is a structural view in which an existing horizontal shaft pump is replaced with the previously proposed vertical shaft pump.

FIG. 6 is a view showing an example of manufacturing a discharge elbow by a conventional steel pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Floor 12 Pumping pipe 14 Impeller casing 16 Suction bell 18 Suction water tank 20, 30 Discharge elbow 22 Reduction gear 24 Input drive shaft 28 Discharge valve 32 Straight pipe 34 Rectangular elbow 34a Side wall 34b, 34c Curved surface 36, 38 Deformed pipe

Claims (5)

[Claims] 1. A reduction gear is drive-coupled to a rotating shaft that projects vertically through an outer wall of a discharge elbow, and the reduction gear is attached to the outer wall, and an input drive shaft of the reduction gear protrudes in a horizontal direction. A vertical axis pump, wherein the discharge elbow has a rectangular cross section having two vertical walls opposed to each other, and a radius of curvature of a center line of a flow path on a plane parallel to the side wall is reduced to reduce a discharge center. A vertical shaft pump characterized in that the height is set to be low. 2. The vertical shaft pump according to claim 1, wherein said discharge elbow is formed by combining two members capable of vertically dividing said discharge elbow. 3. The vertical pump according to claim 1, wherein the discharge elbow is formed by welding a steel plate. 4. The vertical shaft pump according to claim 3, wherein a reinforcing member is provided as a rib on the side wall of the discharge elbow, and the weight is applied to the rotating shaft by the weight of the reduction gear and the pump operation. A vertical shaft pump configured to obtain mechanical strength for supporting a load. 5. The vertical pump according to claim 1, wherein the height of the discharge center of the discharge elbow coincides with the height of the discharge center of the existing horizontal shaft pump. A vertical shaft pump which is installed in place of the horizontal shaft pump.