CN202348525U - Axial-flow rotary propeller type water turbine - Google Patents

Abstract

The utility model belongs to the technical field of water turbines and particularly relates to an axial-flow rotary propeller type water turbine. The axial-flow rotary propeller type water turbine comprises a spiral casing, fixed guide vanes, movable guide vanes, a rotating wheel and a draft tube. The height of the fixed guide vanes and the shapes of the movable guide vanes are designed, and a brand-new guide vane profile is adopted, so that the flowing is smoother and the resistance loss in a flow passage is smaller; the length of the draft tube is designed in a brand-new manner; and a new thickness change rule is applied to the vanes of the rotating wheel from the inlet to the outlet. The axial-flow rotary propeller type water turbine provided by the utility model has the advantages that the efficiency is increased, the vibration and pressure pulsation are reduced, the mechanical strength of the rotating wheel is improved, and the dynamic stress of the vanes of the rotating wheel is reduced, so that the probability of the occurrence of fissure of the vanes of the rotating wheel can be greatly lowered, and the operation stability of the water turbine is improved.

Description

A kind of movable propeller turbine

Technical field

The utility model belongs to turbine technology field, particularly a kind of movable propeller turbine.

Background technique

The domestic movable propeller turbine group of having built up a plurality of 50 meters head sections, the runner form is rich and varied.The ubiquitous defective of water wheels unit of this pattern is that operation stability is poor at present, and vibration and pressure pulsation are bigger, and the runner bucket dynamic stress is bigger, and runner bucket is cracked.

Summary of the invention

The purpose of the utility model is to propose the high movable propeller turbine of a kind of stability.

The technological scheme of the utility model is:

This water turbine comprises spiral case, hub, fixed guide vane, movable guide vane, runner and draft tube; The outlet of spiral case is connected with the inlet of hub; The outlet of hub is connected with the inlet of draft tube, in the ingress of hub fixed guide vane and movable guide vane is set, and runner is installed in hub.

The height H of said fixed guide vane is 160～168mm;

Said movable guide vane is the negative cruvature stator, wherein between the stator molded lines in cross section be smoothed curve, the coordinate of 23 points in rectangular coordinate system on this molded lines is as shown in table 1:

Table 1: stator intermediate cross-section profile coordinate point

Sequence number	301	302	303	304	305	305	307	308	309	310	311	312
													X	0	6	12	18	24	30	36	42	48	54	60	65.71
Y	5.25	4.58	3.9	3.43	3.03	2.81	2.69	2.59	2.4	2.19	1.98	1.86
													Sequence number	313	314	315	316	317	318	319	320	321	322	323
X	6	12	18	24	30	36	42	48	54	60	65.71
													Y	-0.71	-2.17	-3.17	-3.95	-4.5	-4.37	-3.67	-2.81	-1.72	-0.6	-0.9

The structure of said runner is: 5 evenly distributed turbine blades are installed on wheel hub, and said turbine blade can be around pivot rotation separately;

The molded lines of the intermediate cross-section of said turbine blade is a smoothed curve, and 20 positions of point in rectangular coordinate system are as shown in table 2 on this molded lines:

Table 2: turbine blade intermediate cross-section profile coordinate point

Sequence number	701	702	703	704	705	706	707	708	709	710
											X	-81.61	-65.42	-48.8	-32.27	-14.9	0	14.9	32.27	48.84	65.42
Y	35.57	35.27	26.27	18.41	10.28	3.81	-3.05	-11.79	-20.6	-30.1
											Sequence number	711	712	713	714	715	716	717	718	719	720
X	80.05	65.42	48.84	32.27	14.9	0	-14.9	-32.27	-48.8	-65.4
											Y	-41.18	-34.35	-26.1	-19.5	-12.52	-6.59	0	7.53	15.95	24.63

The center line of said runner is 1820～1840mm to the distance L of draft tube outlet.

The beneficial effect of the utility model is: with respect to other existing axial-flow rotary propeller type units; This novel turbine efficiency that improved; Reduce vibration and pressure pulsation, increased the runner mechanical strength, reduced the runner bucket dynamic stress; Make runner bucket the crackle probability occur and reduce greatly, the operation stability of water turbine is improved.

Description of drawings

Fig. 1 is the schematic representation of movable propeller turbine structure;

Fig. 2 is movable propeller turbine rotaring wheel structure figure;

Fig. 3 is the layout plan of water turbine fixed guide vane and movable guide vane;

Fig. 4 is spiral case and fixed guide vane sectional view;

Fig. 5 is the shape schematic representation of movable guide vane;

Fig. 6 is a runner bucket intermediate cross-section schematic representation;

Label among the figure:

The 1-spiral case; The 2-fixed guide vane; The 3-movable guide vane; The 4-rotary wheel of water turbine; The 5-draft tube; The 6-wheel hub; The 7-turbine blade; The 8-draft cone; The 9-hub.

Embodiment

The utility model provides a kind of novel movable propeller turbine, below in conjunction with accompanying drawing and embodiment the utility model is further specified.

As shown in Figure 1, this water turbine comprises spiral case 1, fixed guide vane 2, movable guide vane 3, rotary wheel of water turbine 4 and draft tube 5.The outlet of spiral case 1 is connected with the inlet of hub 9, and the outlet of hub 9 is connected with the inlet of draft tube 5, and fixed guide vane 2 and movable guide vane 3 are set in the ingress of hub 9, and runner 4 is installed in hub 9.

As shown in Figure 2, the structure of said runner 4 is: 5 evenly distributed turbine blades 7 are installed on wheel hub 6, and said turbine blade 7 can be around pivot rotation separately.Draft cone 8 is set below wheel hub 6.

As shown in Figure 4, the height H of said fixed guide vane is designed to 160～168mm;

Like Fig. 3 and shown in Figure 5; Movable guide vane 3 is the negative cruvature stator, wherein between Cross section Design become brand-new molded lines, the closed curve that this stator molded lines is made up of two sections curves of connecing of joining end to end; Get 23 points from molded lines, the position of each point in rectangular coordinate system is as shown in table 1:

Table 1: stator intermediate cross-section profile coordinate point

Sequence number	301	302	303	304	305	305	307	308	309	310	311	312
													X	0	6	12	18	24	30	36	42	48	54	60	65.71
Y	5.25	4.58	3.9	3.43	3.03	2.81	2.69	2.59	2.4	2.19	1.98	1.86
													Sequence number	313	314	315	316	317	318	319	320	321	322	323
X	6	12	18	24	30	36	42	48	54	60	65.71
													Y	-0.71	-2.17	-3.17	-3.95	-4.5	-4.37	-3.67	-2.81	-1.72	-0.6	-0.9

Two curve's equation after the match are respectively:

y＝0.0007x ²-0.0951x+5.0721；

y＝0.0051x ²-0.3311x+1.0593。

Like Fig. 2 and shown in Figure 6; For guaranteeing the hydraulic performance and the structural strength of runner; The intermediate cross-section of turbine blade 7 is designed to the closed curve that the curve of two sections end-to-ends is formed, gets 20 points from molded lines, the position of each point in rectangular coordinate system is as shown in table 2:

Table 2: turbine blade intermediate cross-section profile coordinate point

Two curve's equation after the match are respectively:

y＝-0.0009x ²-0.4827x+4.4692，

y＝0.0004x ²-0.4397x-6.3494。

As shown in Figure 1, increase the exit length of said draft tube, making said runner center line is 1820～1840mm to the distance L of draft tube outlet.

The utility model is tested on ZZY476-40 profile shaft circulation propeller type water turbine; The flow losses of each several part runner have been analyzed; Analyzed flow channel shape and changed influence, analyzed the hydraulic performance of different operating conditionss energy characteristics, cavitation performance and stability.Pass test data and actual effect; Can find, use the unit of the utility model to improve efficient, reduce vibration and pressure pulsation with respect to other existing units; Increased the runner mechanical strength; Reduced the runner bucket dynamic stress, made runner bucket the crackle probability occur and reduce greatly, the operation stability of water turbine is improved.

Claims (1)

1. movable propeller turbine; Comprise spiral case (1), hub (9), fixed guide vane (2), movable guide vane (3), runner (4) and draft tube (5), the outlet of spiral case (1) is connected with the inlet of hub (9), and the outlet of hub (9) is connected with the inlet of draft tube (5); Fixed guide vane (2) and movable guide vane (3) are set in the ingress of hub (9); Runner (4) is installed in hub (9), is it is characterized in that

The height H of said fixed guide vane (2) is 160～168mm;

Said movable guide vane (3) is the negative cruvature stator, wherein between the stator molded lines in cross section be smoothed curve, the coordinate of 23 points in rectangular coordinate system on this molded lines is as shown in table 1:

Table 1: stator intermediate cross-section profile coordinate point

Sequence number 301 302 303 304 305 305 307 308 309 310 311 312 X 0 6 12 18 24 30 36 42 48 54 60 65.71 Y 5.25 4.58 3.9 3.43 3.03 2.81 2.69 2.59 2.4 2.19 1.98 1.86 Sequence number 313 314 315 316 317 318 319 320 321 322 323 X 6 12 18 24 30 36 42 48 54 60 65.71 Y -0.71 -2.17 -3.17 -3.95 -4.5 -4.37 -3.67 -2.81 -1.72 -0.6 -0.9

The structure of said runner (4) is: go up at wheel hub (6) 5 evenly distributed turbine blades (7) are installed, and said turbine blade (7) can be around pivot rotation separately;

The molded lines of the intermediate cross-section of said turbine blade (7) is a smoothed curve, and 20 positions of point in rectangular coordinate system are as shown in table 2 on this molded lines:

Table 2: turbine blade intermediate cross-section profile coordinate point

Sequence number 701 702 703 704 705 706 707 708 709 710 X -81.61 -65.42 -48.8 -32.27 -14.9 0 14.9 32.27 48.84 65.42 Y 35.57 35.27 26.27 18.41 10.28 3.81 -3.05 -11.79 -20.6 -30.1 Sequence number 711 712 713 714 715 716 717 718 719 720 X 80.05 65.42 48.84 32.27 14.9 0 -14.9 -32.27 -48.8 -65.4 Y -41.18 -34.35 -26.1 -19.5 -12.52 -6.59 0 7.53 15.95 24.63

The center line of said runner (4) is 1820～1840mm to the distance L of draft tube (5) outlet.

Images