Low-water-head large-flow mixed-flow water turbine with double-inlet volute
阅读说明：本技术 一种带双进口式蜗壳的低水头大流量混流式水轮机 (Low-water-head large-flow mixed-flow water turbine with double-inlet volute ) 是由 阚阚 陈雅楠 陈会向 周大庆 郑源 莫旭颖 张海晟 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种带双进口式蜗壳的低水头大流量混流式水轮机,所述双进口式蜗壳内侧环形开口处设置有连接座环,连接座环的外周边设有一圈固定导叶,连接座环的内周边设有一圈活动导叶；连接座环内环处套设有转轮,连接座环下方与尾水管前端相连接；所述双进口式蜗壳、连接座环、转轮和尾水管的中心在同一竖直轴线上。本发明通过两个进水口直接连接进水管道实现了双向进水,提高了蜗壳中圆周方向上水流的均匀性,增强了水流在圆周方向上的速度分量,进而有效增大来流的水流环量,改善进入导水机构的水流条件,减小导水机构的水力损失,使得水轮机具有良好的水力性能和运行效率。(The invention discloses a low-water-head large-flow mixed-flow water turbine with a double-inlet volute, wherein a connecting seat ring is arranged at an annular opening at the inner side of the double-inlet volute, a circle of fixed guide vanes are arranged on the outer periphery of the connecting seat ring, and a circle of movable guide vanes are arranged on the inner periphery of the connecting seat ring; a rotating wheel is sleeved at the inner ring of the connecting seat ring, and the lower part of the connecting seat ring is connected with the front end of the draft tube; the centers of the double-inlet volute, the connecting seat ring, the rotating wheel and the draft tube are on the same vertical axis. The invention realizes bidirectional water inlet by directly connecting the two water inlets with the water inlet pipeline, improves the uniformity of water flow in the volute in the circumferential direction, enhances the velocity component of the water flow in the circumferential direction, further effectively increases the water flow circulation quantity of incoming flow, improves the water flow condition entering the water distributor, reduces the hydraulic loss of the water distributor, and ensures that the water turbine has good hydraulic performance and operation efficiency.)
1. The utility model provides a take large-traffic mixed flow turbine of low head of two import formula volutes which characterized in that: the method comprises the following steps: the double-inlet volute comprises a double-inlet volute body, wherein a connecting seat ring is arranged at an annular opening at the inner side of the double-inlet volute body, a circle of fixed guide vanes are arranged on the outer periphery of the connecting seat ring, and a circle of movable guide vanes are arranged on the inner periphery of the connecting seat ring; a rotating wheel is sleeved at the inner ring of the connecting seat ring, and the lower part of the connecting seat ring is connected with the front end of the draft tube; the centers of the double-inlet volute, the connecting seat ring, the rotating wheel and the draft tube are on the same vertical axis.
2. The low head high flow francis turbine of claim 1, with a dual inlet volute, wherein: the double-inlet volute comprises a volute-shaped structure section and two nose end straight pipe sections, wherein the two nose end straight pipe sections are symmetrically arranged in the center of the volute-shaped structure section in the circumferential direction.
3. The low head high flow francis turbine of claim 1, with a dual inlet volute, wherein: be equipped with annular opening on the inboard lateral wall of snail form structure section, annular opening is connected with connection seat ring outer ring edge, and connection seat ring includes: the outer periphery between the upper ring and the lower ring is provided with a circle of fixed guide vanes at equal intervals, and the inner periphery between the upper ring and the lower ring is provided with rotatable movable guide vanes at equal intervals through a rotating shaft.
4. The low head high flow francis turbine of claim 2, with a double inlet volute, wherein: the cross section of the worm-shaped structure section is an elliptical section, and the length ratio of a long half shaft to a short half shaft of the elliptical section is 1.05-1.5: 1.
5. the low head high flow francis turbine of claim 1, with a dual inlet volute, wherein: the outlet diffusion section of the draft tube is provided with a middle buttress, and the tail end of the middle buttress is connected with two symmetrical water outlets.
6. The low head high flow francis turbine of claim 2, with a double inlet volute, wherein: the rotating wheel is a mixed-flow rotating wheel.
7. The low head high flow francis turbine of claim 6, with a double inlet volute, wherein: the mixed-flow runner comprises an upper crown, a lower ring part, blades and a water discharge cone, wherein a circle of blades are arranged below the upper crown at equal intervals, the lower ring part is arranged on the periphery of the circle of blades, and the water discharge cone is arranged in the middle of the circle of blades.
8. The low head high flow francis turbine of claim 7, with a dual inlet volute, wherein: the blade sets up to the unequal thickness distortion blade of X type, and the front and the reverse side of blade are from last to down by the curved surface smooth connection of different curvatures, and the blade is openly and the reverse side is from last to down the section airfoil curve of curved surface sets up as follows:
at the position 300mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.64542×10-10x4-1.46958×10-6x3+0.00291x2-2.86756x+2380.0741
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.75432×10-10x4-2.03994×10-6x3+0.00402x2-4.02082x+2866.72951；
at a position 750mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.19996×10-10x4-1.14415×10-6x3+0.00207x2-1.99463x+2107.88992
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.92333×10-10x4-2.15426×10-6x3+0.00429x2-4.31712x+3032.534；
at a position 1200mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝3.1883×10-10x4-1.95839×10-6x3+0.00435x2-4.63901x+3253.58373
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.31328×10-10x4-1.90604×10-6x3+0.004x2-4.26041x+3157.20165；
at the position 1400mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.21968×10-10x4-1.3492×10-6x3+0.00291x2-3.09251x+2688.1943
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝1.14959×10-10x4-4.60183×10-7x3+3.92233×10-4x2-0.28833x+1608.07575；
at a position 1650mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.59866×10-10x4-1.53705×10-6x3+0.0032x2-3.19056x+2751.57044
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝7.98552×10-11x4-1.59138×10-7x3-6.0409×10-4x2+1.15208x+989.48737；
at the position 2150mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝1.00637×10-9x4-5.85871×10-6x3+0.01262x2-12.20288x+6233.86489
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝5.62468×10-10x4-3.30975×10-6x3+0.00715x2-7.17544x+4599.23406。
Technical Field
The invention relates to a low-water-head large-flow mixed-flow water turbine with a double-inlet volute, belonging to the technical field of water turbines.
Background
The mixed flow water turbine is one of the most widely used water turbines, and its main components include water guiding chamber, seat ring, water guiding mechanism, runner and tail pipe. The volute is used as a water diversion component of the water turbine, and has the function of enabling water flow to form a ring amount from the hydraulic viewpoint so as to ensure that the water flow can enter the seat ring and the movable guide vane at a smaller attack angle and reduce the hydraulic loss of the water guide mechanism.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a low-water-head large-flow mixed-flow water turbine with a double-inlet volute.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a low-head large-flow mixed-flow water turbine with double-inlet type volute comprises: the double-inlet volute comprises a double-inlet volute body, wherein a connecting seat ring is arranged at an annular opening at the inner side of the double-inlet volute body, a circle of fixed guide vanes are arranged on the outer periphery of the connecting seat ring, and a circle of movable guide vanes are arranged on the inner periphery of the connecting seat ring; a rotating wheel is sleeved at the inner ring of the connecting seat ring, and the lower part of the connecting seat ring is connected with the front end of the draft tube; the centers of the double-inlet volute, the connecting seat ring, the rotating wheel and the draft tube are on the same vertical axis.
Preferably, the double-inlet volute comprises a volute-shaped structure section and two nose-end straight pipe sections, and the two nose-end straight pipe sections are arranged in the volute-shaped structure section in a central symmetry manner in the circumferential direction.
As preferred scheme, be equipped with annular opening on the inboard lateral wall of snail form structure section, annular opening is connected with the outer ring edge of connecting seat ring, and connecting seat ring includes: the outer periphery between the upper ring and the lower ring is provided with a circle of fixed guide vanes at equal intervals, and the inner periphery between the upper ring and the lower ring is provided with rotatable movable guide vanes at equal intervals through a rotating shaft.
Preferably, the cross section of the volute structure section is an elliptical cross section, and the length ratio of a long half shaft to a short half shaft of the elliptical cross section is 1.05-1.5: 1.
as a preferred scheme, the outlet diffusion section of the draft tube is provided with a middle buttress, and the tail end of the middle buttress is connected with two symmetrical water outlets.
Preferably, the runner is a mixed-flow runner.
Preferably, the mixed-flow runner comprises an upper crown, a lower ring part, blades and a drainage cone, wherein a circle of blades are arranged below the upper crown at equal intervals, the lower ring part is arranged on the periphery of the circle of blades, and the drainage cone is arranged in the middle of the circle of blades.
As the preferred scheme, the blade sets up to the unequal thickness distortion blade of X type, and the front and the reverse side of blade are from last to down by the smooth connection of the curved surface of different curvatures, and the positive and reverse side of blade is from the section airfoil profile curve of the curved surface that is from last to down set up as follows:
at the position 300mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.64542×10-10x4-1.46958×10-6x3+0.00291x2-2.86756x+2380.0741
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.75432×10-10x4-2.03994×10-6x3+0.00402x2-4.02082x+2866.72951；
at a position 750mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.19996×10-10x4-1.14415×10-6x3+0.00207x2-1.99463x+2107.88992
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.92333×10-10x4-2.15426×10-6x3+0.00429x2-4.31712x+3032.534；
at a position 1200mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝3.1883×10-10x4-1.95839×10-6x3+0.00435x2-4.63901x+3253.58373
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.31328×10-10x4-1.90604×10-6x3+0.004x2-4.26041x+3157.20165；
at the position 1400mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.21968×10-10x4-1.3492×10-6x3+0.00291x2-3.09251x+2688.1943
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝1.14959×10-10x4-4.60183×10-7x3+3.92233×10-4x2-0.28833x+1608.07575；
at a position 1650mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.59866×10-10x4-1.53705×10-6x3+0.0032x2-3.19056x+2751.57044
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝7.98552×10-11x4-1.59138×10-7x3-6.0409×10-4x2+1.15208x+989.48737；
at the position 2150mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝1.00637×10-9x4-5.85871×10-6x3+0.01262x2-12.20288x+6233.86489
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝5.62468×10-10x4-3.30975×10-6x3+0.00715x2-7.17544x+4599.23406。
has the advantages that: according to the low-head large-flow mixed-flow water turbine with the double-inlet volute, the two water inlets are directly connected with the water inlet pipeline to realize bidirectional water inlet, so that the uniformity of water flow in the volute in the circumferential direction is improved, the velocity component of the water flow in the circumferential direction is enhanced, the water flow circulation amount of incoming flow is effectively increased, the water flow condition entering the water distributor is improved, the hydraulic loss of the water distributor is reduced, and the water turbine has good hydraulic performance and operation efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a low-head large-flow mixed-flow water turbine with a double-inlet volute provided by the invention.
Fig. 2 is a schematic diagram of a dual-inlet volute structure according to the present invention.
Fig. 3 is a schematic cross-sectional view of a connecting seat ring according to the present invention.
Fig. 4 is a schematic view of the structure of the rotary wheel provided by the invention.
Fig. 5 is a schematic view of a blade structure according to the present invention.
FIG. 6 is a schematic view of airfoil curves on a blade at different horizontal axial distances from the rotor crown according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the low-head large-flow mixed-flow water turbine with the double-inlet volute provided by the invention sequentially comprises a double-inlet volute 1, fixed guide vanes 2, movable guide vanes 3, a rotating wheel 4 and a tail water pipe 5 according to a water inlet direction, wherein a connecting seat ring 6 is arranged at an annular opening at the inner side of the double-inlet volute, a circle of fixed guide vanes 2 is arranged at the outer periphery of the connecting seat ring 6, and a circle of movable guide vanes 3 is arranged at the inner periphery of the connecting seat ring 6; the inner ring of the connecting seat ring 6 is sleeved with a rotating wheel 4, and the lower part of the connecting seat ring 6 is connected with the front end of a draft tube 5; the centers of the double-inlet volute 1, the connecting seat ring 6, the rotating wheel 4 and the draft tube 5 are on the same vertical axis.
As shown in fig. 2, the double-inlet volute 1 comprises a volute-shaped structure section 101 and two nose-end straight pipe sections 102, and the volute-shaped structure section 101 is centrally symmetrically provided with the two nose-end straight pipe sections 102 in the circumferential direction.
As shown in fig. 3, an annular opening is provided on the inner side wall of the volute structure section 101, the annular opening is connected with the outer annular edge of the connecting seat ring 6, and the connecting seat ring 6 includes: the device comprises an upper ring 601 and a lower ring 602, wherein a circle of fixed guide vanes 2 are arranged on the outer periphery between the upper ring and the lower ring at equal intervals, and a rotatable movable guide vane 3 is arranged on the inner periphery between the upper ring and the lower ring at equal intervals through a rotating shaft.
The inlet section of the worm-shaped structure section 6 is an oval section, and the length ratio of the long half shaft to the short half shaft is 1.05-1.5: 1. the two nose end straight pipe sections 7 are directly communicated with a water inlet pipeline.
The outlet diffusion section of the draft tube 5 is provided with a middle buttress, and the tail end of the middle buttress is connected with two symmetrical water outlets.
As shown in fig. 4, the runner 4 is a mixed-flow runner, and includes an upper crown 401, a lower ring portion 402, blades 403, and a drainage cone 404, wherein a circle of blades 403 is arranged at equal intervals below the upper crown 401, the lower ring portion 402 is arranged at the periphery of the circle of blades 403, and the drainage cone 404 is arranged in the middle of the circle of blades 403.
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