Novel draft-tube and preparation method thereof

A draft tube and a new type of technology, applied in the field of draft tubes, can solve the problems of aquatic weed deposition, limitation, increase local resistance of draft tubes, etc., and achieve the effects of uniform flow direction speed, avoid pressure pulsation, and simple structure.

Inactive Publication Date: 2008-04-09
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
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Problems solved by technology

Another method is to add various baffles or conical objects with more complex structures in the draft tube. These methods not only greatly increase the local resistance of the draft tube, but also easily cause the deposition of sediment and aquatic plants in the water flow.
Moreover, the above two types of methods play a very limited role in improving the vibration caused by the second unstable factor above.

Method used

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  • Novel draft-tube and preparation method thereof
  • Novel draft-tube and preparation method thereof
  • Novel draft-tube and preparation method thereof

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Embodiment Construction

[0022] The principle and structure of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] As shown in Fig. 1, Fig. 2 and Fig. 3, the structure of the novel draft tube is specifically that eight pairs of triangular blades are uniformly and fixedly arranged on the inner wall of the water inlet of the pipe body 3 along the circumferential direction. Each pair of triangular blades includes two symmetrically arranged triangular blades 1, and each triangular blade 1 includes a long side 5, a short side 6 and an installation side 4, wherein the long side 5 is arranged on the side close to the end face 2 of the water inlet, and the short side 6 It is arranged on the side away from the end surface 2 of the water inlet, and the installation side 4 is connected to the inner wall of the water inlet on the whole side. The included angle between the mounting side 4 and the long side 5 is α, and α is 2°, 10°, 30°, etc. The included a...

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Abstract

The invention relates to a draft tube used for a hydraulic turbine outlet and a manufacture method of the draft tube. The high pressure recovery coefficient of the draft tube of an existing hydraulic turbine is not enough, and the hydraulic turbine can not stably work with high efficiency. The internal wall of the water inlet of the draft tube body of the invention is fixedly provided with 8-30 triangle leaf pairs in the circumference direction. Each triangle leaf pair comprises two triangle leaves which are symmetrically arranged; each triangle leaf comprises a long edge, a short edge, and an installation edge which is connected with the whole edge of the internal wall of the water inlet; wherein, the long edge is arranged at one side close to the end surface of the water inlet; the short edge is arranged at one side far away from the end surface of the water inlet. The invention has the advantages of simple structure, smart arrangement, cheap cost, and wide applicable range, and can ensure the high-efficient and stable operation of hydraulic generator units with different capabilities on all flux working conditions.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and engineering equipment, and in particular relates to a draft tube used for the outlet of a water turbine. Background technique [0002] In the hydroelectric power generation device, the outlet of the water turbine is equipped with a draft tube, its function is to direct the water flowing out of the runner to the downstream, and to recover part of the energy at the outlet of the runner, so that the potential energy of the water drop can be fully utilized and the water turbine can be improved. s efficiency. To do this, a negative pressure less than atmospheric pressure needs to be created at the outlet of the runner to generate suction on the outlet of the turbine. Therefore, the draft tube is also called the suction tube. When the suction height is positive, with the help of the draft tube, the runner of the turbine can be installed above the downstream water level, and a part of the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B11/04F03B3/02
CPCY02E10/226Y02E10/223Y02E10/20Y02P70/50
Inventor 潘华辰陈鹰聂欣毛洁樊炜
Owner HANGZHOU DIANZI UNIV
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