CN215595776U

CN215595776U - Water drainage cone capable of improving water energy utilization rate

Info

Publication number: CN215595776U
Application number: CN202121245164.2U
Authority: CN
Inventors: 周玉国; 董钟明; 乔鹏; 冉旭
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-01-21
Anticipated expiration: 2031-06-04

Abstract

The utility model provides a water escape cone for improving the utilization rate of water energy, which comprises a conical pipe with a large upper part and a small lower part and a cylindrical pipe connected with the lower end of the conical pipe, wherein the upper end of the conical pipe is connected with the bottom of an upper crown of a rotating wheel, a plurality of through holes are arranged on the conical pipe, and a spiral drainage groove is arranged on the outer side of the cylindrical pipe. The water escape cone can reduce hydraulic loss, improve the efficiency of the water turbine, simultaneously can weaken the pressure pulsation of a draft tube, improve the central air supply effect and improve the operation stability of the water turbine to a certain extent.

Description

Water drainage cone capable of improving water energy utilization rate

Technical Field

The utility model belongs to the field of hydraulic generator equipment, and particularly relates to a water escape cone for improving the water energy utilization rate.

Background

The runner is a core component for converting water energy into mechanical energy in the water turbine, and in the giant mixed-flow type water turbine generator set, the runner generally comprises an upper crown, a lower ring, blades and a water discharge cone, and the water discharge cone is generally connected to the central position of the lower part of the upper crown in a welding or bolt combining mode and is used for guiding water flow at the water outlet side of the runner to be smoothly guided into a tail water pipe, so that severe collision is avoided after the water flow flows out from the runner, and further hydraulic loss is avoided. At present, in a huge hydroelectric generating set, two categories of short drain cones and long drain cones exist, the outer surfaces of the two categories are smooth structures, and the two types of drain cones have short plates to a certain extent in the aspects of reducing water flow collision at a runner outlet and reducing hydraulic loss at the runner outlet in the use process, so that the efficiency of a water turbine is not improved favorably. Meanwhile, the severe impact of the water flow at the outlet of the runner is easy to aggravate the cavitation phenomenon of the water turbine, and is not beneficial to the long-term stable operation of the runner.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a water escape cone capable of improving the water energy utilization rate, reducing the hydraulic loss and improving the efficiency of a water turbine, simultaneously weakening the pressure pulsation of a draft tube, improving the central air supply effect and improving the operation stability of the water turbine to a certain extent.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the utility model provides an improve hydroenergy utilization rate's wash-out cone, includes big-end-up's toper pipe and the cylinder pipe of being connected with toper pipe lower extreme, and toper pipe upper end is connected bottom the runner crown, is equipped with a plurality of through-holes on the toper pipe, and the cylinder outside of tubes is equipped with spiral drainage groove.

In the preferred scheme, the inner wall of the upper end of the conical pipe is provided with a connecting frame, and the connecting frame is connected with the upper crown of the rotating wheel through a bolt.

In a preferred scheme, the cross section of the spiral drainage groove is a circular arc.

In a preferred embodiment, the through hole is arranged obliquely downward.

According to the water escape cone for improving the water energy utilization rate, water flows into the inner cavity of the water escape cone through the through hole and then passes through the outlet at the lower end of the water escape cone, and can be directly supplemented to the vacuum area of the outlet of the rotating wheel, so that the vortex band of the draft tube can be eliminated or weakened, and the purpose of reducing pressure pulsation is achieved. The rivers of runner export can be carried out level and smooth drainage by spiral drainage groove, have reduced because of the water conservancy loss that rivers striking arouses, can improve hydraulic turbine efficiency.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the installation of the present invention;

in the figure: the device comprises a conical pipe 1, a cylindrical pipe 2, a runner crown 3, a through hole 4, a spiral drainage groove 5, a connecting frame 6 and a bolt 7.

Detailed Description

As shown in figures 1-2, a water drain cone for improving the water energy utilization rate comprises a conical pipe 1 with a large upper end and a small lower end and a cylindrical pipe 2 connected with the lower end of the conical pipe 1, wherein the upper end of the conical pipe 1 is connected with the bottom of an upper crown 3 of a rotating wheel, the reliable connection with the rotating wheel is realized, the reloading central lines of the conical pipe 1 and the cylindrical pipe 2 are superposed with the rotating central line of the rotating wheel, and the conical pipe 1 and the upper crown 3 of the rotating wheel and the conical pipe 1 and the cylindrical pipe 2 are in arc transition, so that the hydraulic loss caused by hydraulic impact can be reduced.

The tapered pipe 1 is provided with a plurality of through holes 4, water flow at the outlet of the rotating wheel flows downwards along the outer surface of the tapered pipe 1 of the water drain cone and is divided into two paths after meeting the through holes 4, one path continues to flow downwards along the outer surface of the tapered pipe 1, and the other path enters the inner cavity of the water drain cone through the through holes 4 and then flows downwards. After passing through the conical pipe 1, the water flow flows downwards along the cylindrical pipe 2 and is discharged into tail water.

When the water turbine operates under non-optimal working conditions, a certain degree of vacuum can be formed at the outlet of the runner, and then the pressure pulsation of the draft tube is caused. Meanwhile, the long drain cone structure is adopted, air can be directly introduced into the vacuum area when the air supplementing system in the center of the main shaft supplements air, and the air supplementing effect is obvious.

The outer side of the cylindrical pipe 2 is provided with a spiral drainage groove 5. Spiral drainage groove 5 adopts overlook anticlockwise soon to, it is unanimous to rotate the direction with runner export rivers, the pitch of spiral drainage groove 5 should design according to the velocity of water flow and the direction of runner export, specifically with hydraulic turbine unit's flood peak, the model, the form of runner is relevant etc. in order to guarantee that the rivers direction of motion of runner export is unanimous with spiral drainage groove 5's helix direction, so, the rivers of runner export can carry out level and smooth drainage by spiral drainage groove 5, the water conservancy loss that arouses because of the rivers striking has been reduced, can improve hydraulic turbine efficiency.

Preferably, the cross section of the spiral drainage groove 5 is smooth arc-shaped, so that the hydraulic loss in the drainage process can be reduced.

Preferably, the inner wall of the upper end of the conical tube 1 is provided with a connecting frame 6, and the connecting frame 6 is connected with the runner crown 3 through a bolt 7.

Through setting up link 6, make things convenient for conical duct 1 and runner crown 3 to be connected, still can be and subsidiary welded structure simultaneously, carry out reliable connection with this wash-out cone structure and runner.

Preferably, the through hole 4 is disposed obliquely downward. The hydraulic impact is further reduced, water flow is guided to smoothly enter the inner cavity of the water escape cone, and the through holes 4 can be distributed in a spiral downward mode, so that the resistance to the water flow is reduced.

The sluicing awl of this structural style can reduce the striking of runner export rivers, and then reduces hydraulic loss, improves hydraulic turbine efficiency. Meanwhile, when the vacuum occurs at the outlet of the runner, the inner cavity runner designed by the drainage cone can guide water flow or air from the central air supplement device to supplement the air to a vacuum area, so that a draft tube vortex band is reduced or eliminated, and the purpose of reducing the pressure pulsation of the water turbine is achieved. The structure and the principle are simple, and the method has certain applicability.

Claims

1. The utility model provides a improve sluicing awl of hydroenergy utilization ratio which characterized in that: the device comprises a conical tube (1) with a large upper part and a small lower part and a cylindrical tube (2) connected with the lower end of the conical tube (1), wherein the upper end of the conical tube (1) is connected with the bottom of an upper crown (3) of a rotating wheel, a plurality of through holes (4) are formed in the conical tube (1), and a spiral drainage groove (5) is formed in the outer side of the cylindrical tube (2).

2. The water escape cone for improving the water energy utilization rate as claimed in claim 1, wherein: the inner wall of the upper end of the conical pipe (1) is provided with a connecting frame (6), and the connecting frame (6) is connected with the runner upper crown (3) through a bolt (7).

3. The water escape cone for improving the water energy utilization rate as claimed in claim 1, wherein: the cross section of the spiral drainage groove (5) is a circular arc.

4. The water escape cone for improving the water energy utilization rate as claimed in claim 1, wherein: the through holes (4) are arranged obliquely downwards.