Water turbine bucket with spoon-shaped forward-extending water diversion blade

Abstract

The invention belongs to the technical field of water turbine buckets, and particularly relates to a water turbine bucket with a spoon-shaped forward-extending water dividing blade. According to the technical scheme, the water turbine bucket with the spoon-shaped forward-extending water diversion blade comprises a bucket body, the forward-extending water diversion blade is arranged in the middle of the bucket body, the forward-extending water diversion blade comprises a linear section and a spoon-shaped front end, the surface molded line of the spoon-shaped front end is in an arc shape, the bucket body is provided with a bucket front face and a bucket back face, and the spoon-shaped front end protrudes in the direction of the bucket front face. According to the water turbine bucket with the spoon-shaped forward-extending water diversion blade, the spoon-shaped front end is arranged at the end of the forward-extending water diversion blade, water flow can be guided, the tip end of the water diversion blade is thickened, and the influence of abrasion damage in the operation process of a water turbine is relieved.

Description

Technical Field

[0001] The invention belongs to the technical field of water turbine buckets, and in particular relates to a water turbine bucket with a spoon-shaped forward extending water dividing blade. Background Art

[0002] A Pelton turbine is a hydraulic machine that uses high-speed water flow to impact the runner to perform work. The Pelton is an important component that carries the jet work and has a significant impact on the performance of the unit.

[0003] like Figure 6 and Figure 7 As shown in FIG. 1 , the bucket blade of a conventional Pelton turbine is a symmetrical bucket-shaped structure, and its water splitter blade is a straight line connected to the tip head. In actual operation, the tip of the water splitter blade is a structurally weak area and is easily damaged by abrasion. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a turbine bucket with a spoon-shaped forward-extending water-dividing blade. By setting a spoon-shaped front end at the end of the forward-extending water-dividing blade, the water flow can be guided and the tip of the water-dividing blade can be thickened to reduce the influence of abrasion damage during the operation of the turbine.

[0005] The technical solution adopted by the present invention is:

[0006] A water turbine bucket with a spoon-shaped forward-extending water-dividing blade comprises a bucket body, a forward-extending water-dividing blade is arranged in the middle of the bucket body, the forward-extending water-dividing blade comprises a straight section and a spoon-shaped front end, the surface profile of the spoon-shaped front end is an arc, the bucket body comprises a bucket front side and a bucket back side, and the spoon-shaped front end protrudes toward the direction of the bucket front side.

[0007] The forward extending water splitter blade of the present invention has a spoon-shaped front end which protrudes toward the incoming flow direction of the jet flow, and can better guide the incoming flow, reduce the impact of the incoming flow, and thus mitigate the influence of abrasion.

[0008] The spoon-shaped front end of the forward extending water-dividing blade of the present invention can increase the thickness of the tip of the water-dividing blade head, enhance the rigidity and strength of the water bucket, and by adjusting the shape of the water blade of the water bucket head part, it is beneficial to carry out reinforcement design when designing the impeller structure.

[0009] As a preferred solution of the present invention, the straight section and the spoon-shaped front end have a smooth transition to ensure smooth guidance of the water flow.

[0010] As a preferred embodiment of the present invention, the intersection of the spoon-shaped front end and the back of the water bucket is the outermost tip. When the straight line segment of the forward extending water-dividing blade is set horizontally, the height difference between the point on the front end line of the spoon-shaped front end and the outermost tip is y, the horizontal distance between the point on the front end line of the spoon-shaped front end and the outermost tip is L, the diameter of the maximum circumscribed circle of the spoon-shaped front end on the forward extending water-dividing blade is D, and the fitting equation is:

[0011] y=-0.0003(DL) 4 +0.2054(DL) 3 -56.211(DL) 2 +6830.1(DL)-310899.

[0012] The spoon-shaped front end controls the profile of the water-dividing blade head through the distance L and the height y. During design, L and y can be adjusted according to the actual design of the bucket runner's maximum circumscribed circle diameter D of the water-dividing blade to change the position and shape of the water-dividing blade head, thereby adapting to different flow conditions and better guiding the incoming flow.

[0013] As a preferred embodiment of the present invention, when x=DL, the fitting equation is:

[0014] y=-0.0003x 4 +0.2054x 3 -56.211x 2 +6830.1x-310899.

[0015] As a preferred solution of the present invention, the horizontal distance between the point on the front end line of the spoon-shaped portion and the outermost tip is L≤1 / 12D. The maximum range of the control position L is 1 / 12D.

[0016] As a preferred solution of the present invention, the water bucket body has two water bucket grooves, and the two water bucket grooves are respectively arranged on both sides of the forward extending water dividing blade.

[0017] The beneficial effects of the present invention are:

[0018] 1. The forward extending water-dividing blade of the present invention has a spoon-shaped front end, which protrudes toward the direction of the jet flow, can better guide the jet flow, reduce the impact of the jet flow, and thus alleviate the impact of the jet flow.

[0019] 2. The spoon-shaped front end of the forward extending water-dividing blade of the present invention can increase the thickness of the tip of the water-dividing blade head, enhance the rigidity and strength of the water bucket, and by adjusting the shape of the water blade of the water bucket head part, it is beneficial to carry out reinforcement design during the impeller structure design. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of the present invention;

[0021] Figure 2 is a top view of the present invention;

[0022] Figure 3 It is a schematic diagram of the maximum circumscribed circle of the spoon-shaped front end;

[0023] Figure 4 It is a coordinate schematic diagram of the present invention;

[0024] Figure 5 This is a schematic diagram of the spoon-shaped front end line fitting;

[0025] Figure 6 is a cross-sectional view of an existing water turbine bucket;

[0026] Figure 7 It is a schematic diagram of the structure of a Pelton turbine runner.

[0027] In the figure: 1- water bucket body; 2- forward extending water dividing blade; 11- front side of water bucket; 12- back side of water bucket; 13- water bucket groove; 21- straight line segment; 22- spoon-shaped front end. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0030] like Figure 1 to Figure 5 As shown, the turbine bucket with a spoon-shaped forward-extending water-dividing blade in this embodiment includes a bucket body 1, a forward-extending water-dividing blade 2 is arranged in the middle of the bucket body 1, the forward-extending water-dividing blade 2 includes a straight section 21 and a spoon-shaped front end 22, the surface profile of the spoon-shaped front end 22 is an arc, the bucket body 1 has a bucket front side 11 and a bucket back side 12, and the spoon-shaped front end 22 protrudes toward the bucket front side 11.

[0031] The water bucket body 1 has two water bucket grooves 13 , and the two water bucket grooves 13 are respectively arranged on both sides of the forward extending water dividing blade 2 .

[0032] The forward extending water splitter blade 2 of the present invention has a spoon-shaped front end 22, which protrudes toward the incoming flow direction of the jet, and can better guide the incoming flow, reduce the impact of the incoming flow, and thus alleviate the influence of abrasion.

[0033] The spoon-shaped front end 22 of the forward extending water-dividing blade 2 of the present invention can increase the thickness of the tip of the water-dividing blade head, enhance the rigidity and strength of the water bucket, and by adjusting the shape of the water blade of the water bucket head part, it is beneficial to carry out reinforcement design when designing the impeller structure.

[0034] The straight section 21 and the spoon-shaped front end 22 have a smooth transition to ensure smooth guidance of the water flow.

[0035] The intersection of the spoon-shaped front end 22 and the back of the water bucket 12 is the outermost point. When the straight line segment 21 of the forward water-dividing blade 2 is set horizontally, the height difference between the point on the line of the spoon-shaped front end 22 and the outermost point is y, the horizontal distance between the point on the line of the spoon-shaped front end 22 and the outermost point is L, and the diameter of the maximum circumscribed circle of the spoon-shaped front end 22 on the forward water-dividing blade 2 is D. The fitting equation is:

[0036] y=-0.0003(DL) 4 +0.2054(DL) 3 -56.211(DL) 2 +6830.1(DL)-310899.

[0037] The spoon-shaped front end 22 controls the profile of the water-dividing blade head through the distance L and the height y. During the design, L and y can be adjusted according to the actual design of the bucket wheel and the maximum circumscribed circle diameter D of the water-dividing blade, and the position and shape of the water-dividing blade head can be changed to adapt to different flow conditions, thereby better guiding the incoming flow.

[0038] When x=DL, the fitting equation is:

[0039] y=-0.0003x 4 +0.2054x 3 -56.211x 2 +6830.1x-310899.

[0040] It should be noted that the horizontal distance between the point on the line of the spoon-shaped front end 22 and the outermost tip is L≤1 / 12D. The maximum range of the control position L is 1 / 12D.

[0041] The present invention is a bucket with a spoon-shaped forward extending water-dividing blade 2 of a Pelton turbine. The bucket body 1 includes a bucket front face 11 and a bucket back face 12. The focus is on the forward extending design (spoon-shaped front end 22) of the head of the forward extending water-dividing blade 2 at the symmetrical position of the bucket front face 11. The cross-sectional shape of the spoon-shaped front end 22 of the present invention not only plays a role in strengthening and thickening the tip of the forward extending water-dividing blade 2, but also can guide the incoming flow and reduce the influence of abrasion damage.

[0042] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A water turbine bucket with a spoon-shaped forward-extending water-dividing blade, characterized in that: The invention comprises a water bucket body (1), wherein a forward extending water dividing blade (2) is arranged in the middle of the water bucket body (1), wherein the forward extending water dividing blade (2) comprises a straight line segment (21) and a spoon-shaped front end (22), wherein the surface profile of the spoon-shaped front end (22) is arc-shaped, and the water bucket body (1) comprises a water bucket front face (11) and a water bucket back face (12), wherein the spoon-shaped front end (22) protrudes toward the water bucket front face (11).

2. A water turbine bucket with a spoon-shaped forward extending water dividing blade according to claim 1, characterized in that: The straight section (21) and the spoon-shaped front end (22) are in smooth transition.

3. A water turbine bucket with a spoon-shaped forward extending water dividing blade according to claim 1, characterized in that: The intersection of the spoon-shaped front end (22) and the back side (12) of the water bucket is the outermost sharp point. When the straight line segment (21) of the forward extending water-dividing blade (2) is arranged horizontally, the height difference between the point on the line of the spoon-shaped front end (22) and the outermost sharp point is y, the horizontal distance between the point on the line of the spoon-shaped front end (22) and the outermost sharp point is L, the diameter of the maximum circumscribed circle of the spoon-shaped front end (22) on the forward extending water-dividing blade (2) is D, and the fitting equation is: y=-0.0003(D-L) 4 +0.2054(D-L) 3 -56.211(D-L) 2 +6830.1(D-L)-310899。 4. A water turbine bucket with a spoon-shaped forward extending water dividing blade according to claim 3, characterized in that: When x=DL, the fitting equation is: y=-0.0003x 4 +0.2054x 3 -56.211x 2 +6830.1x-310899。 5. The water turbine bucket with a spoon-shaped forward extending water dividing blade according to claim 3, characterized in that: The horizontal distance between the point on the line of the spoon-shaped front end (22) and the outermost tip is L≤1 / 12D.

6. A water turbine bucket with a spoon-shaped forward extending water dividing blade according to any one of claims 1 to 5, characterized in that: The water bucket main body (1) has two water bucket grooves (13), and the two water bucket grooves (13) are respectively arranged on both sides of the forward extending water dividing blade (2).

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