Fish guide device for pump and axial flow pump/tubular flow pump station
The present disclosure provides a fish guide device for a pump. An axial flow pump blade is located in a runner chamber. A fish guide ring mounted on a wall surface of the runner chamber is arranged at an inlet of the axial flow pump blade. A fish guide cap is mounted on a hub of the axial flow pump blade. A plurality of jet holes are provided on the fish guide ring, to form a jet to guide fish to the fish guide cap. A plurality of fish guide grooves are provided on a surface of the fish guide cap. The present disclosure allows the fish to enter a flow channel of an axial flow pump. This can improve the survival rate of fish and allow the fish to smoothly pass through the axial flow pump.
1 . A fish guide device for a pump, wherein an axial flow pump blade is located in a runner chamber, wherein, a fish guide ring mounted on a wall surface of the runner chamber is arranged at an inlet of the axial flow pump blade, and a fish guide cap is mounted on a hub of the axial flow pump blade; a plurality of jet holes are provided on the fish guide ring, to form a jet to guide fish to the fish guide cap; and a plurality of fish guide grooves are provided on a surface of the fish guide cap to allow the fish to enter a flow channel of an axial flow pump.
2 . The fish guide device for the pump according to claim 1 , wherein, the fish guide ring comprises an upstream surface and a downstream surface, wherein an end of the upstream surface is tangent to the wall surface of the runner chamber, an other end of the upstream surface intersects with the downstream surface, and the plurality of jet holes tapering in a flow direction are provided between the upstream surface and the downstream surface.
3 . The fish guide device for the pump according to claim 2 , wherein, a cross-sectional profile of the downstream surface is a straight line, to uniformly increase an area of a flow cross-section at the downstream surface in the flow direction.
4 . The fish guide device for the pump according to claim 3 , wherein, an angle β 1 formed between the cross-sectional profile of the downstream surface and a profile of the runner chamber ranges from 3° to 5°.
5 . The fish guide device for the pump according to claim 2 , wherein, a cross-sectional profile of the upstream surface is a smooth curve, to smoothly guide the fish.
6 . The fish guide device for the pump according to claim 5 , wherein, a tangent line on an inner side of the cross-sectional profile of the upstream surface forms an acute angle β 2 with a rotation axis.
7 . The fish guide device for the pump according to claim 2 , wherein, the other end of the upstream surface intersects with the downstream surface to form an intersection line K, and a circular arc transition is provided at the intersection line K; and a radius at the intersection line K is defined as R 2 , a radius of the runner chamber is defined as R 1 , and R 2 /R 1 ≥0.9.
8 . The fish guide device for the pump according to claim 6 , wherein, an axis of each of the plurality of jet holes is a curve, and a tangent line at an entrance end point at which the curve intersects with the upstream surface is parallel to the wall surface of the runner chamber; and a tangent line at an exit end point at which the curve intersects with the downstream surface forms an angle β 3 with the rotation axis, and β 3 <β 2 .
9 . The fish guide device for the pump according to claim 2 , wherein, a cross-sectional diameter of each of the plurality of jet holes on the upstream surface is defined as d 1 , a cross-sectional diameter of each of the plurality of jet holes on the downstream surface is defined as d 2 , and a value of d 1 /d 2 satisfies: 2≤d 1 /d 2 ≤4.
10 . The fish guide device for the pump according to claim 9 , wherein, the cross-sectional diameter d 1 of each of the plurality of jet holes on the upstream surface satisfies the following requirement: 0.5(R 1 −R 2 )≤d 1 ≤0.8(R 1 −R 2 ).
11 . The fish guide device for the pump according to claim 2 , wherein, the plurality of jet holes are uniformly arranged on the fish guide ring in a circumferential direction, and a number of the plurality of jet holes is 18 to 54.
12 . The fish guide device for the pump according to claim 2 , wherein, a positioning ring is arranged on the fish guide ring, and the positioning ring is configured to mount the fish guide ring between the runner chamber and an inlet pipe.
13 . The fish guide device for the pump according to claim 1 , wherein, the surface of the fish guide cap is covered with a cushioning flexible material.
14 . The fish guide device for the pump according to claim 1 , wherein, an axial-sectional profile of the fish guide cap is a semi-ellipse, and a length of a long side of the semi-ellipse is defined as F 1 ; a vertical distance between an upstream vertex M of the fish guide cap and an intersection line K is defined as L 1 , a distance between a rear edge of the fish guide cap and the intersection line K is defined as L 2 , and the intersection line K is an intersection line between an upstream surface and a downstream surface of the fish guide ring; and
a mounting position of the fish guide cap satisfies: F 1 =L 2 −L 1 , R 2 /tan(β 2 )>L 1 , and L 2 >R 3 /tan(β 3 ), wherein
β 3 is an angle between a rotation axis and a tangent line at an exit end point at which an axis of each of the plurality of jet holes intersects with the downstream surface of the fish guide ring; R 3 is a distance from the exit end point of each of the plurality of jet holes to the rotation axis; β 2 is an angle between the rotation axis and a tangent line on an inner side of a cross-sectional profile of the upstream surface of the fish guide ring; and R 2 is a radius at the intersection line K.
15 . The fish guide device for the pump according to claim 1 , wherein, an axis of each of the plurality of fish guide grooves is parallel to a rotation axis.
16 . The fish guide device for the pump according to claim 1 , wherein, an axis of each of the plurality of fish guide grooves forms an angle α 1 with a rotation axis, and α 1 <α 2 , wherein α 2 is a placement angle of the axial flow pump blade.
17 . The fish guide device for the pump according to claim 1 , wherein, a cross-section of each of the plurality of fish guide grooves is in a spindle-like shape formed by two symmetrical circular arcs.
18 . The fish guide device for the pump according to claim 14 , wherein, left and right sides of an axis of each of the plurality of fish guide grooves are connected to the surface of the fish guide cap, a cross-section of each of the plurality of fish guide grooves converges along the axis of each of the plurality of fish guide grooves to a front end point Q 1 and a rear end point Q 2 , respectively, and the front end point is located upstream the rear end point; and the rear end point Q 2 of each of the plurality of fish guide grooves coincides with the rear edge of the fish guide cap, and a straight-line distance from the front end point of each of the plurality of fish guide grooves to the rotation axis is set to 0.1*F 2 to 0.3*F 2 , wherein F 2 is a length of a short side of the semi-ellipse.
19 . The fish guide device for the pump according to claim 1 , wherein, a number of the plurality of fish guide grooves provided on the surface of the fish guide cap is 1 to 2 times a number of the axial flow pump blade.
20 . The fish guide device for the pump according to claim 1 , wherein, the plurality of fish guide grooves on the surface of the fish guide cap are staggered from the axial flow pump blade.
21 . An axial flow pump/tubular flow pump station, wherein the fish guide device for the pump according to claim 1 is removably mounted in the axial flow pump/tubular flow pump station.