CN2100503U

CN2100503U - Vane flow-stabilizing device of turbines

Info

Publication number: CN2100503U
Application number: CN91214762U
Authority: CN
Inventors: 张富钦
Original assignee: DONGFANG ELECTRIC MOTOR FACTOR
Current assignee: Dongfang Electric Machinery Co Ltd DEC
Priority date: 1991-07-20
Filing date: 1991-07-20
Publication date: 1992-04-01

Abstract

The utility model relates to a wing-shaped flow-stabilizing device of a water turbine. The utility model is installed in the tail water pipe of the mixed flow type water turbine, and is used for reducing pressure pulsation in the tail water pipe of the mixed flow type water turbine. The wing-shaped flow-stabilizing device is formed by the welding of a molding steel plate, and the cross section forms a wing shape. The wing-shaped flow-stabilizing device not only weakens vortex strip strength, but also converts unavailable rotating water flows in the tail water pipe into available axial flows. The efficiency of the water turbine is increased.

Description

Vane flow-stabilizing device of turbines

The utility model is the wing constant-current stabilizer of water turbine in a kind of turbine draft tube, belongs to water turbine and reduces the pressure pulsation technical field.

The pulsation of Francis turbine draft tube internal pressure is one of major reason of unit hydraulic vibration, the method that reduces pressure pulsation at present both at home and abroad in draft tube has two kinds: a kind of is the thing that places all sorts of obstacles in draft tube, stop the current rotation, typically as installing triangle fin on the power plant tail water tube wall in the Gu, by stoping the current rotation, destroy and weaken the whirlpool band, another kind is various making-up air devices, as circle, oval blowdown pipe, the short tube tonifying Qi, cross tonifying Qi etc., be to improve whirlpool band internal pressure by tonifying Qi, reduce pressure difference, the former causes the greater impact loss, the latter reduces the water turbine effective head, and the two all makes turbine efficiency reduce.

The utility model designs at solving these problems that exist at present, rotary water current guiding in the draft tube can be converted into the axial flow that can recycle, the constant-current stabilizer of raising the efficiency.

The utility model is realized by wing blowdown pipe is installed in draft tube, steel plate welding with moulding, it is wing that section becomes, and changes the size of wing head inlet angle, just can adapt to various on year-on-year basis speed, different heads Francis turbine, after rotary water current in the draft tube is flowed through this device, change water (flow) direction, weakened rotation circulation, thereby reduced pressure pulsation, improve the tonifying Qi effect, improve the purpose of turbine efficiency.

The utility model also can be by installing wing fin in draft tube, wing support flow steadying grid is realized.

Below in conjunction with accompanying drawing the utility model is further described:

Fig. 1 is a wing blowdown pipe structure diagram of the present utility model.

1 wing blowdown pipe

Fig. 2 is the wing fin structure diagram of the utility model

1 wing support flow steadying grid

Fig. 3 is the wing support flow steadying grid of a utility model structure diagram

1 wing fin

Referring to Fig. 1, wing blowdown pipe 1 is installed in the draft tube, is welded by the shaping steel plate, it is wing that section becomes, wing head inlet angle α determines according to different runner draft tube Flow Field Calculation or measured result, exports to axially, and gas supplementing opening is driveed in the end and back side low pressure place, when current flow through wing blowdown pipe, rotary water current is converted into axial current under the latticed wing effect, thereby has weakened the whirlpool band strength, reaches to reduce the pressure pulsation purpose, low pressure area is overleaf opened in the tonifying Qi hole, can improve nature tonifying Qi effect.

Wing support flow steadying grid, wing fin are that rotary water current is converted into axial current equally, weaken the whirlpool band, reduce pressure pulsation.

The utility model is compared with existing device has following advantage:

1, more effectively reduces pressure fluctuation than existing device.

2, can reduce the eddy loss that accounts for the loss large percentage in the hydraulic turbine, improve hydraulic turbine average efficiency.

Claims

1, a kind of interior wing constant-current stabilizer of water turbine of Francis turbine draft tube that is used for is made up of blowdown pipe, it is characterized in that blowdown pipe is to be welded by the shaping steel plate, and it is wing that section becomes.

2, the wing constant-current stabilizer of water turbine according to claim 1 is characterized in that wing head inlet angle according to the decision of different runner draft tube Flow Field Calculation or measured result, exports to axially.