CN2174574Y - Water turbine with auxiliary spray - Google Patents

Abstract

The utility model relates to an impact or inclined impact type water turbine, belonging to the technical field of hydraulic power generation, an auxiliary nozzle is arranged on the water turbine, and therefore, surplus water quantity can be utilized to increase output or enhance the output of the machine with insufficient output. The auxiliary nozzle (11) is arranged on the tangent line of the pitch circle of a rotary wheel (5) corresponding to the other side of a main nozzle (4), one auxiliary nozzle or a plurality of ofauxiliary nozzles can be arranged, the auxiliary nozzle is arranged close to the water skip (6) of the rotary wheel, and a safety distance is 20 to 30 mm. Through a connecting piece (12), the auxiliary nozzle (11) is connected with a branch diversion pipe (13) which is diverged from a diversion pipe, and a gate valve (14) is arranged on the branch diversion pipe. A machine set has smaller structure, intensity and control influence, but the output can be increased according to anticipation, and the technique is convenient and easily feasible.

Description

Water turbine with auxiliary spray

The utility model relates to impact and the auxiliary nozzle of inclined-jet turbine installing, to utilize the increase of superfluous water amount to exert oneself or to improve exerting oneself of undercapacity unit, the utility model belongs to the hydraulic power generation technology field, by retrieval and consult interrelated data, does not still have the technology identical with the utility model.

The water power plant of impact type and inclined-jet turbine is housed, and the same with other water power plant, existing electric motor power small hydro resource can not make full use of, and the unnecessary water yield is discarded, and the big investment of electric motor power increases the contradiction that equipment can not make full use of.In existing power station, water turbine design, because of parameters selection improper, the unreasonable type of applying mechanically, factor such as workmanship is bad makes impacts and inclined-jet turbine does not reach design rating and happens occasionally, Pump for Medium and Small Power Generating Set more more sees.

From reality, recognize, the impulse turbine of the single nozzle of substantially horizontal is housed, produce and the jet direction horizontal thrust, make and only consider that the sliding bearing that bears the gravity design weares and teares to jet direction, serious make the bearing displacement, influence runner and nozzle relative position, cause the efficient decline of exerting oneself.The bucket back side molded lines that yet has does not reach designing requirement, falls in that casting surplus in the indentation, there back side is undressed, makes it touch jet prior to cutting edge, and not only destroying jet influence efficient but also can produce upwards component, can make in the time of seriously spool and the bearing generation is beated.

Problem at above-mentioned power plant construction and impact or inclined-jet turbine in use exist the utility model proposes the auxiliary nozzle of installing, changes control mode, increases to impact and inclined-jet turbine is exerted oneself, the raising economic benefit of hydropower sta.

The structure and the mounting arrangements of auxiliary nozzle are provided by accompanying drawing.

Accompanying drawing: 1,3 is the main and auxiliary nozzle layout plan of impulse turbine, 1, nozzle needle; 2, folding is asked device; 3, power stream; 4, main jet is chewed; 5, runner; 6, bucket; 7, breach back side molded lines; 8, breach; 9, cutting edge; 10, assisted jet; 11, auxiliary nozzle; 12, coupling; 13, prop up aqueduct; 14, valve.

Accompanying drawing 2,4 is the main and auxiliary nozzle layout plan of inclined-jet turbine.3, power stream; 4, main jet is chewed; 5, runner; 10, assisted jet; 11, auxiliary nozzle.

Auxiliary spray helps (11) to be installed in relative main jet and chews on (4) another side runner (5) pitch circle tangent line, can adorn one or several, as far as possible near runner bucket (6), and its safe distance 20～30mm.Auxiliary nozzle (11) joins with a coupling (12) and an aqueduct (13) of telling from aqueduct, establishes gate valve (14) (control electromagnetic hydraulic valve automatically) control on the aqueduct and drops into or excision.Auxiliary nozzle is not adorned nozzle needle and is regulated flow, drops into auxiliary nozzle and undertake steady load when the unit load surpasses auxiliary nozzle capacity, and load variations is chewed adjusting by main jet.Auxiliary for this reason nozzle design capacity wants littler, is controlled at 20～50% of unit capacity.

The design of auxiliary nozzle: 1, capacity Np=0.2～0.5N, N-unit capacity;

2, flow Qp=Np/9.81H η, H-net water head (M), efficiency eta=0.85～0.86;

3, jet velocity Vp=ψ $\sqrt{\mathrm{2gH}}$ , efflux coefficient ψ=0.95～0.97;

4, jet diameter do= $\sqrt{\mathrm{40p\; /\; \Pi \; Vp}}$ ；

5, auxiliary nozzle outlet diameter d=1.1～1.2do;

6, auxiliary nozzle angle of throat α=12～16 °;

7, prop up aqueduct diameter D=(2.4～2.6) d;

Auxiliary nozzle and aqueduct organization plan such as accompanying drawing 3.Auxiliary nozzle (11) is inner bright and clean, and outlet has round-corner transition, uses than the high-abrasive material manufacturing.

Auxiliary nozzle is chewed with main jet and is compared, and because of the size effect influence is big, efficient is on the low side; But auxiliary nozzle is not established nozzle needle (1) and is regulated flow, does not adorn folding and asks that its outlet of device (2) can more close runner bucket, and hydraulic loss is less, and it is high to chew efficient than main jet again, comprehensive analysis, and main and auxiliary nozzle efficient is close.

Claims (3)

1, the auxiliary nozzle of installing on impact and inclined-jet turbine utilizes the unnecessary water yield to increase output of hydraulic turbine or increase undercapacity unit output, it is characterized in that:

Auxiliary spray helps (11) to be installed in relative main jet and chews on (4) another side runner (5) pitch circle tangent line, can adorn one or several, as far as possible near runner bucket (6), its safe distance 20～30mm, auxiliary nozzle (11) joins with a coupling (12) and an aqueduct (13) of telling from aqueduct, establishes gate valve (14) on the aqueduct.

2,, it is characterized in that 12 °～16 ° of auxiliary nozzle (11) angle of throat, inlet diameter D=(2.4～2.6 according to the described device of claim 1) the d outlet diameter, inner bright and clean, outlet has round-corner transition, uses than the high-abrasive material manufacturing.

3, according to the described device of claim 1, it is characterized in that auxiliary nozzle (11), its capacity is 20～50% of a unit capacity.

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