Elliptical arc-shaped water pump water inlet flow guide piece arrangement structure

Abstract

The utility model relates to an oval arc-shaped water pump water inlet flow guide piece arrangement structure which comprises a water pump, an oval arc-shaped horn mouth, a flow guide cone, four streamline-shaped flow guide piers, a water absorption room bottom plate and a water washing room side wall. The four streamline-shaped flow guide piers are evenly distributed between the oval arc-shaped horn mouth and the water absorption room bottom plate in the horizontal circumferential direction. The axial direction of the streamline-shaped flow guide pier points to the center of the water pump, a flow guide cone is arranged between the oval arc-shaped horn mouth and a bottom plate of the water suction chamber, and the plane projection of the center of the flow guide cone and the plane projection of the center of the water pump coincide. The water inlet flow velocity of the horn mouth is uniformly and progressively increased; four streamline-shaped flow guide piers are arranged on the symmetrical center line of the cone, so that the rotation of water flow in a limited space of the water suction pool during the operation of the water pump can be reduced; the water pump must be reduced in net positive suction head and good in anti-cavitation performance; the water pump is more stable in operation and smaller in vibration, and after practical engineering application, the maximum amplitude value of each part of the water pump is actually measured to be only 0.016 mm.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of hydraulic engineering. BACKGROUND

[0002] The area near the water inlet of the water pump is a transition area from non-pressure flow to pressure flow, and vortex is easily generated in the process that the water flow converges into the water suction horn of the water pump, and if the flow guide component is not properly designed, the stability and working efficiency of the water pump operation will be seriously affected. CONTENT

[0003] The utility model discloses a kind of flow guide piece arrangement structures, suitable for large and medium-sized water pump inlet flow guide, improve the stability of water pump operation, improve working efficiency.

[0004] To solve the above problems, the utility model discloses an oval arc water pump water inlet flow guide piece arrangement structure, including water pump, oval arc horn, flow cone, streamline flow guide pier, water suction interval bottom plate and water washing interval side wall, 4 streamline flow guide piers are evenly distributed between oval arc horn and water suction interval bottom plate along horizontal circumferential direction, streamline flow guide pier axis direction points to water pump center, flow cone is equipped between oval arc horn and water suction interval bottom plate, the center of flow cone and water pump center plane projection coincide, the oval arc horn arc is large horn, and the oval center height is flush with water pump inlet, the water inlet diameter of water pump is D, the arc size of oval arc horn corresponds to the length of long axis of ellipse D, and the length of short axis is 0.5D, and the distance from water suction interval side wall to water pump center line is 1.25D.

[0005] Further, the streamline flow guide pier is 0.1D in width perpendicular to water flow direction, 0.467D in length parallel to water flow direction, and is streamline along water flow direction.

[0006] Further, the flow cone is circular arc flow cone, and the circular arc radius is 0.75D, the circular arc bottom is tangent to water suction interval bottom plate, the circular arc side is tangent to water pump center, and the top of flow cone is partially rounded.

[0007] Physical model test research verification, compared with conventional technology, the utility model has the beneficial effects that:

[0008] (1) avoid that annular water flow collides on horn bottom plate to generate greater hydraulic loss when water pump operates, so that water inlet of horn increases uniformly along the way;

[0009] (2) streamline flow guide pier 4 are arranged on the symmetry center line of cone, so that rotation of water flow in water suction pool limited space when water pump operates can be reduced;

[0010] (3) the hydraulic loss of water suction horn of water pump is reduced by about 54%;

[0011] (4) the primary vortex submergence depth and the funnel through vortex primary submergence depth are reduced by about 20% and 8% respectively;

[0012] (5) the water pump must reduce the NPSH and have good anti-cavitation performance;

[0013] (6) the water pump runs more smoothly and has smaller vibration, and after actual engineering application, the maximum amplitude of each part of the water pump is only 0.016mm. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 : the side view of the water pump suction horn mouth;

[0015] Figure 2 : the local enlarged view of the water pump inlet flow guide;

[0016] Figure 3 : the A-A sectional view of Figure 2 ;

[0017] Figure 4 : the streamline flow guide pier arrangement drawing;

[0018] Figure 5 : the B-B sectional view of Figure 4 .

[0019] Wherein, 1-water pump, 2-elliptical arc horn mouth, 3-streamline flow guide pier, 4-flow guide cone, 5-suction interval bottom plate, 6-suction interval side wall. DETAILED DESCRIPTION

[0020] The utility model specific implementation mode is:

[0021] The traditional water pump quarter elliptical arc horn mouth 2 is changed into half elliptical arc large horn mouth, and the elliptical arc horn mouth 2 bottom "I" shaped flow guide pier is changed into circular arc flow guide cone plus "cross" streamline flow guide pier form, and the patent is applicable to large and medium-sized water pump inlet flow guide.

[0022] With the water pump 1 inlet diameter D as reference, according to the relative size of the elliptical arc horn mouth 2, streamline flow guide pier 3 and flow guide cone 4 shown in Figure 1 、 Figure 2 、 Figure 3 , the geometric similarity of the relative size of each component and the mutual position relation thereof is kept, the flow guide components of the water pump 1 are made, including the elliptical arc horn mouth 2, streamline flow guide pier 3 and flow guide cone 4, and the relative distance between the water pump 1 and the suction interval bottom plate 5 and the suction interval side wall 6 is kept to meet Figure 1The requirement is that four streamline guide piers 3 are evenly distributed between the elliptical arc-shaped horn mouth 2 and the suction room bottom plate 5 along the horizontal circumferential direction, the axis direction of the streamline guide pier 3 points to the water pump center, a guide cone 4 is arranged between the elliptical arc-shaped horn mouth 2 and the suction room bottom plate 5, the center of the guide cone 4 is coincident with the planar projection of the water pump 1 center, the circular arc of the elliptical arc-shaped horn mouth 2 is a large horn mouth with a semi-elliptical shape, the elliptical center height is flush with the water pump 1 inlet, the water pump 1 inlet diameter is D, the arc-shaped size of the elliptical arc-shaped horn mouth 2 corresponds to the length of the major axis of the ellipse, which is D, the length of the minor axis is 0.5D, and the distance from the suction room side wall 6 to the water pump center line is 1.25D.

[0023] The streamline guide pier 3 is 0.1D wide perpendicularly to the water flow direction, 0.467D long parallel to the water flow direction, and streamline-shaped along the water flow direction.

[0024] The guide cone 4 is a circular arc guide cone, the circular arc radius is 0.75D, the circular arc bottom is tangent to the suction room bottom plate 5, the circular arc side is tangent to the water pump 1 center, and the top of the guide cone 4 is partially rounded.

[0025] The water passing wall surface of the elliptical arc-shaped horn mouth 2, the streamline guide pier 3 and the guide cone 4 should be smooth, the component strength design and material selection should meet the requirements of long-term water flow impact and scour resistance, and the material can be flexibly selected, such as cement, organic glass, glass steel, resin and the like.

Claims

1. An elliptical arc-shaped water pump water inlet guide arrangement structure, characterized in that, The utility model relates to a water pump, elliptic arc horn, flow guide cone, streamline guide pier, water suction room bottom plate and water washing room side wall, and four streamline guide piers are evenly distributed along the horizontal circumferential direction between the elliptic arc horn and the water suction room bottom plate, the streamline guide pier axis direction points to the water pump center, the elliptic arc horn and the water suction room bottom plate are equipped with the flow guide cone, the flow guide cone center and the water pump center plane projection coincide, the elliptic arc horn circular arc is half-elliptic big horn, the elliptic center height is flush with the water pump inlet, the water pump water inlet diameter is D, the elliptic arc horn arc size corresponds to the elliptic long axis length D, the short axis length is 0.5D, and the water suction room side wall to the water pump center line distance is 1.25D.

2. The elliptical arc-shaped water pump water inlet guide arrangement structure according to claim 1, characterized in that, The streamline guide pier is 0.1D wide perpendicular to the water flow direction, 0.467D long parallel to the water flow direction, and streamline-shaped along the water flow direction.

3. The elliptical arc-shaped water pump water inlet guide arrangement structure according to claim 1, characterized in that, The flow guide cone is a circular arc flow guide cone with a radius of 0.75D, a circular arc bottom tangent to the water suction room bottom plate, a circular arc side tangent to the water pump center, and a flow guide cone top partially rounded.

Images