JP2001182697A - High speed pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high speed pump capable of avoiding reduction in pump efficiency by minimizing a hydraulic power loss even if water is delivered by changing the water flowing direction in the direction orthogonal to the impeller axis. SOLUTION: A pump casing 2 for rotatably housing a pump impeller 1 is composed of a spiral volute for turning water delivered from an oulet 1A of the pump impeller 1 while separating from the pump impeller 1 in the direction of the impeller axis C of the pump impeller 1 over a winding finish part 2B from a winding start part 2A. A suction port 9 opening in response to the inlet 1B side of the pump impeller 1 is arranged on the central part lower side of this spiral volute, and a delivery port 7 is arranged for delivering water in the direction orthogonal to the impeller axis C in response to the winding finish part 2B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-speed pump comprising an axial pump or a mixed flow pump.

[0002]

2. Description of the Related Art Conventionally, a high-speed pump P comprising a vertical axial pump shown in FIG. 5 has a pumping pipe 3 and a discharge bend 4 provided downstream of a pump casing 2 in which an axial impeller 1 is rotatably accommodated. In the pump casing 2, a plurality of guide vanes 5 are disposed immediately downstream of the axial impeller 1 inside the pump casing 2, and a high-speed pump P composed of a vertical shaft mixed flow pump shown in FIG. The pumping pipe 3 and the discharge bend 4 are arranged in a permutation downstream of the pump casing 2 that rotatably accommodates the mixed flow impeller 1. Guide vanes 5
Is arranged. The axial flow impeller 1 and the mixed flow impeller 1 are connected to a prime mover (not shown) via a pump shaft 10.

In these vertical high-speed pumps P, the water sucked into the pump casing 2 by the rotation of the axial or mixed flow impeller 1 is discharged from the outlet of the impeller 1 to the guide blades 5. The guide blades 5 convert the velocity energy of the water given by the impeller 1 into pressure energy and flow down to the pumping pipe 3, and after the discharge bend 4 changes the flow direction by 90 degrees in a direction orthogonal to the impeller axis C. The water is discharged to the drain pipe 6 and drained.

[0004]

However, in the conventional vertical shaft high-speed pump P, the flow direction of the water pushed up by the pumping pipe 3 is suddenly changed by 90 degrees by the discharge bend 4, so that the discharge bend 4 The hydraulic power loss when passing through the inside increased, and the pump efficiency was reduced. This is the same for the horizontal axis high-speed pump P in which the impeller axis C is horizontal.

Therefore, the use of the guide vanes 5, the water pump 3 and the discharge bend 4 is omitted, and as shown in FIG. 7, a volute type pump casing 2 used in a low speed / low head type centrifugal pump. An axial or mixed flow impeller 1 (however, the axial flow impeller 1 is shown in FIG. 7) is rotatably accommodated therein, and water discharged from an outlet of the impeller 1 is subjected to a volute type pump casing 2. 90 ° in the direction perpendicular to the axis C of the impeller.
It is conceivable that the water is discharged by discharging to a drain pipe (not shown) connected to the drain.

However, in the high-speed pump P employing the volute pump casing 2, the direction of flow of water is suddenly changed by 90 ° by the bent portion 8 inside the volute pump casing 2. The hydraulic power loss at this point is large, and the pump efficiency is reduced.

Therefore, the present invention has been made to solve the above-mentioned problems, and it is possible to reduce the hydraulic power loss even if the direction of flow of water is changed to the direction intersecting the axis of the impeller. It is an object of the present invention to provide a high-speed pump capable of suppressing a decrease in pump efficiency while suppressing the pump efficiency.

[0008]

In order to achieve the above object, a high-speed pump according to the present invention comprises a pump impeller comprising one of an axial flow impeller and an oblique flow impeller, and rotating the pump impeller. A pump casing that freely accommodates the pump casing, wherein the pump casing separates the water discharged from the outlet of the pump impeller from the pump impeller in the direction of the impeller axis from the winding start portion to the winding end portion. The spiral volute is provided with a suction port that opens in the center of the spiral volute corresponding to the inlet side of the pump impeller, and the blade corresponds to the winding end portion. A discharge port for discharging water is provided in a direction intersecting the axle line.

According to the present invention, the water is sucked into the inside from the suction port at the center of the pump casing constituted by the spiral volute by the rotation of the pump impeller, and is discharged from the outlet through the inlet of the pump impeller. You. The water discharged from the outlet of the pump impeller does not suddenly change its direction in a direction intersecting with the axis of the impeller, but moves in the direction of the impeller axis from the winding start to the winding end of the spiral volute. From the outlet, and is smoothly changed in the direction intersecting the axis of the impeller and discharged from the discharge port.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing one embodiment of a high-speed pump according to the present invention, FIG. 2 is a plan view showing one embodiment of a pump casing, and FIG. 3 is a perspective view showing one embodiment of a pump casing. It is. Note that the same parts as those of the high-speed pump P described in the conventional example of FIGS. 5 to 7 are denoted by the same reference numerals, and redundant description will be omitted. 1 to 3, a pump impeller 1 is constituted by an axial impeller and is rotatably accommodated in a pump casing 2. The pump casing 2 is provided at the outlet 1A of the pump impeller 1.
From the winding start part 2A to the winding end part 2
B is formed by a spiral volute which is turned in the direction of the impeller axis C of the pump impeller 1 while moving away from the pump impeller 1, and the inlet 1B side of the pump impeller 1 is located below the center of the spiral volute. And a discharge port 7 for discharging water in a direction orthogonal to the impeller axis C corresponding to the winding end portion 2B. Also, the inner peripheral wall 2 of the pump casing 2
C and the outer peripheral wall 2D are formed substantially parallel to the impeller axis C. In addition, a drain pipe (not shown) is connected to the discharge port 7.

With such a structure, the water is sucked into the inside from the suction port 9 at the center of the pump casing 2 formed by the spiral volute by the rotation of the pump impeller 1, and the inlet of the pump impeller 2 is formed. Exit 1A via 1B
From the pump casing 2. The water discharged from the outlet 1A of the pump impeller 1 does not suddenly change its direction in a direction perpendicular to the impeller axis C, but extends from the winding start portion 2A to the winding end portion 2B of the spiral volute. In the direction away from the pump impeller 1, the direction is smoothly changed in a direction orthogonal to the impeller axis C, and the fluid is discharged from the discharge port 7. Therefore,
Even if the direction of flow of water is changed to a direction perpendicular to the axis C of the impeller and the water is discharged, the hydraulic power loss can be suppressed to a small extent, and a decrease in pump efficiency can be avoided.

Next, another embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 4, the pump impeller 1 is formed by a mixed flow impeller. Further, the inner and outer peripheral walls 2C, 2D of the pump casing 2 constituted by a spiral volute.
Are formed so as to increase in diameter in the direction of the impeller axis C as the distance from the pump impeller 1 increases.

Even with such a structure, water is sucked into the inside from the suction port 9 at the center of the pump casing 2 constituted by a spiral volute by rotation of the pump impeller 1, Exit 1 via entrance 1B
A is discharged into the pump casing 2 from A. The water discharged from the outlet 1A of the pump impeller 1 is
FIG. 2 shows a sharp change in the direction
And the spiral volute shown in FIG. 3 turns from the pump impeller 1 in the direction of the impeller axis C from the winding start portion 2A to the winding end portion 2B while turning away from the pump impeller 1, and smoothly changes its direction in a direction perpendicular to the impeller axis C. Then, the ink is discharged from the discharge port 7. Therefore, even if the direction of flow of water is changed to the direction orthogonal to the axis C of the impeller and the water is discharged, the hydraulic loss can be suppressed to a small value, and a decrease in pump efficiency can be avoided.

In each of the above embodiments, the water discharged from the outlet 1A of the pump impeller 1 is changed to a direction perpendicular to the impeller axis C and discharged from the discharge port 7. The configuration is not limited to the conversion to only the direction of rotation, and the discharge port 7 may be configured to change to a direction intersecting the axis C of the impeller and discharge the impeller. In addition, although the description has been given of the high-speed vertical pump in which the impeller axis C is vertical, a high-speed horizontal pump in which the impeller axis C is horizontal may be used.

[0016]

As described above, since the high-speed pump of the present invention is constituted, the following special effects can be obtained.

That is, the water sucked into the inside of the pump casing formed by the spiral volute by the rotation of the pump impeller through the inlet at the center of the pump casing is discharged from the outlet through the inlet of the pump impeller to the inside of the pump casing. After that, without suddenly turning in the direction perpendicular to the impeller axis, the spiral volute turns from the start to the end of the spiral volute while turning away from the pump impeller in the direction of the impeller axis, and the impeller rotates. Since the direction is smoothly changed in the direction intersecting the axle axis and discharged from the discharge port, even if the flow direction of water is changed to the direction intersecting the axis of the impeller and the water is discharged, the hydraulic power loss is kept small and the pump A decrease in efficiency can be avoided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a high-speed pump according to the present invention.

FIG. 2 is a top plan view schematically showing one embodiment of a pump casing.

FIG. 3 is a side perspective view schematically showing one embodiment of a pump casing.

FIG. 4 is a longitudinal sectional view showing another embodiment of the high-speed pump according to the present invention.

FIG. 5 is a configuration diagram of a conventional example.

FIG. 6 is a configuration diagram of another conventional example.

FIG. 7 is a longitudinal sectional view of still another conventional example.

[Explanation of symbols]

 1 Axial or mixed flow impeller (pump impeller) 1A Pump impeller outlet 1B Pump impeller inlet 2 Pump casing 2A Winding start 2B Winding end 7 Pump casing discharge port 9 Pump casing suction port C Impeller axis P High-speed pump

Claims (1)

[Claims] 1. A high-speed pump comprising: a pump impeller comprising either an axial impeller or a mixed flow impeller; and a pump casing rotatably housing the pump impeller, wherein the pump casing is It is constituted by a spiral volute which turns the water discharged from the outlet of the pump impeller from the winding start to the winding end while moving away from the pump impeller in the direction of the impeller axis, and the pump is disposed at the center of the spiral volute. A suction port that opens corresponding to the inlet side of the impeller is provided,
A high-speed pump having a discharge port for discharging water in a direction intersecting the axis of the impeller corresponding to the winding end portion.