CN210003442U

CN210003442U - Axial thrust structure of horizontal mixed-flow water turbine

Info

Publication number: CN210003442U
Application number: CN201920729138.3U
Authority: CN
Inventors: 张永学; 秦波; 周康宁
Original assignee: Chongqing Water Turbine Works Co Ltd
Current assignee: Chongqing Water Turbine Works Co Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-01-31
Anticipated expiration: 2029-05-21

Abstract

The utility model provides a horizontal mixed-flow turbine axial thrust structure, including main shaft and the runner of setting on main shaft, set up the tailrace taper pipe in runner side to and set up the back shroud on the runner, be provided with manger plate portion between the lower ring bottom of tailrace taper pipe and runner, manger plate portion fixed connection is on the back shroud. The utility model improves the water pressure at the lower ring of the runner by arranging the water retaining part between the tail water taper pipe and the lower ring bottom of the runner, and increases the reverse thrust of the runner, thereby reducing the combined bearing running temperature of the unit with thrust, improving the reliability and the safety of the unit running, reducing the running and maintenance cost of the power station, and improving the economic benefit of the power station; adopt the utility model discloses, increase on the horizontal mixed-flow turbine of current conventionality the manger plate portion can to extremely simple structure just can reduce unit thrust bearing tile temperature, all is extremely favourable to current hydraulic turbine unit technical improvement and newly-built hydraulic turbine unit.

Description

Axial thrust structure of horizontal mixed-flow water turbine

Technical Field

The utility model relates to a horizontal mixed-flow water turbine, concretely relates to horizontal mixed-flow water turbine axial thrust structure.

Background

The horizontal mixed-flow water turbine generator set includes main shaft, thrust bearing, generator, back guide bearing and flywheel, the main shaft is mounted on the thrust bearing and back guide bearing, the water turbine includes water inlet pipe, runner, guide vane, water guide mechanism, volute, tail water pipe, top cover and bottom ring, the water inlet pipe is formed by connecting several sections of pressure steel pipes through flanges, the tail end pressure steel pipe is connected with the volute of the water turbine, the volute of the water turbine is set outside the top cover, the top cover is provided with fixed guide vane device, end of the fixed guide vane device is connected with the volute, the runner is set in the runner cavity formed by the top cover and the bottom ring, the other end of the fixed guide vane device is connected with the runner cavity, the guide vane is set in the fixed guide vane device and controlled by the water guide mechanism, the tail water pipe is connected with the water outlet of the runner, the middle end of the main shaft is connected with the runner, the flywheel is connected with another end of the flywheel, the end of the guide vane is set with the runner bearing, the runner bearing is set on the runner plate, the runner bearing is set on the end of the runner bearing, the runner bearing is set on the runner bearing, the runner bearing is set, the runner bush tile of the thrust bearing is set on the runner shaft, the runner bush set, the runner shaft, the runner bearing, the thrust bearing, the runner bearing, the thrust bearing.

Based on this, CN103206335B discloses horizontal mixed flow water turbine generator sets, which comprises a water turbine, a main shaft, a thrust bearing, a generator, a rear guide bearing and a flywheel, wherein the main shaft is erected on the thrust bearing and the rear guide bearing, the water turbine comprises a water inlet pipe, a rotating wheel, a guide vane, a water guide mechanism, a volute, a draft tube, a top cover and a bottom ring, the water inlet pipe is formed by connecting a plurality of sections of pressure steel pipes through a flange, the end pressure steel pipe is connected with the volute, the volute is arranged on the outer side of the top cover, a fixed guide vane device is arranged in the top cover, the end of the fixed guide vane device is connected with the volute 7, the rotating wheel is arranged in a rotating wheel cavity formed by the top cover and the bottom ring, the other end of the fixed guide vane device is connected with the rotating wheel cavity, the guide vane is arranged in the fixed guide vane device and controlled by the water guide mechanism, the draft tube is connected with a water outlet of the rotating wheel cavity, the middle section of the main shaft is connected with the rotating wheel, the generator is driven to generate electricity, the other end of the main shaft is connected with the rotating wheel, the right end of the thrust bearing, the flywheel is arranged on the right end of the thrust bearing, the rotating wheel bearing, the flywheel is fixed guide vane is fixed ring, the rotating wheel is arranged on the rotating wheel, the lower end of the rotating wheel, the rotating wheel is provided with the water guide vane wheel, the rotating wheel, the water guide ring, the water guide vane wheel, the rotating wheel, the water guide ring is arranged on the rotating wheel, the water guide ring is provided with the water guide ring, the rotating wheel, the water guide ring, the rotating wheel, the water guide ring is arranged on the water guide ring, the rotating wheel, the water guide ring is arranged on the rotating wheel, the.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide simple structure's horizontal mixed flow turbine axial thrust structure.

In order to achieve the above purpose, the present invention adopts the following technical solution.

Horizontal mixed-flow turbine axial thrust structure, including main shaft and the runner of setting on the main shaft, set up the tailwater taper pipe in runner side to and set up the back shroud on the runner, its characterized in that: a water retaining part is arranged between the tail water taper pipe and the bottom of the lower ring of the rotating wheel, and the water retaining part is fixedly connected on the rear cover plate.

, the gap between the inner side wall of the water retaining part and the bottom of the lower ring of the rotating wheel is 2.5-5 mm.

, the height of the water-retaining part is 30-40 mm.

Preferably, the water retaining part is a water retaining ring.

Preferably, the water retaining part comprises a plurality of arc-shaped water retaining plates, and all the arc-shaped water retaining plates surround to form the annular water retaining part together.

Has the advantages that: the utility model improves the water pressure at the lower ring of the runner by arranging the water retaining part between the tail water taper pipe and the lower ring bottom of the runner, and increases the reverse thrust of the runner, thereby reducing the combined bearing running temperature of the unit with thrust, improving the reliability and the safety of the unit running, reducing the running and maintenance cost of the power station, and improving the economic benefit of the power station; adopt the utility model discloses, increase on the horizontal mixed-flow turbine of current conventionality the manger plate portion can to extremely simple structure just can reduce unit thrust bearing tile temperature, all is extremely favourable to current hydraulic turbine unit technical improvement and newly-built hydraulic turbine unit.

Drawings

FIG. 1 is a partial schematic view of an axial thrust structure of a horizontal mixed-flow water turbine in embodiment 1;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of a water retaining part of an axial thrust structure of the horizontal mixed-flow water turbine in embodiment 1;

fig. 4 is a schematic view of a water deflector of an axial thrust structure of the horizontal francis turbine in embodiment 2.

Detailed Description

The present invention is described in with reference to the accompanying drawings and the embodiments, but the following description of the embodiments is only for the purpose of helping understanding the principle and the core idea of the present invention, and is not intended to limit the scope of the present invention.

Example 1

The axial thrust structure of the horizontal mixed-flow water turbine is shown in fig. 1, fig. 2 and fig. 3, and comprises a main shaft 4, a rotating wheel 5 arranged on the main shaft 4, a tail water conical pipe 3 arranged on the side of the rotating wheel 5, and a rear cover plate 6 arranged on the rotating wheel 5, wherein a water retaining part 2 is arranged between the tail water conical pipe 3 and the bottom of a lower ring 1 of the rotating wheel 5, and the water retaining part 2 is fixedly connected to the rear cover plate 6.

Wherein, the gap between the inner side wall of the water retaining part 2 and the bottom of the lower ring 1 of the rotating wheel 5 is 3-5 mm.

Wherein, the height of the water retaining part 2 is 30-40 mm.

Wherein, the water retaining part 2 is a circular water retaining ring 201, as shown in fig. 3. When the water retaining ring is installed, the inner ring of the circular water retaining ring 201 is welded on the rear cover plate 6.

Example 2

The axial thrust structure of the horizontal mixed-flow water turbine is shown in fig. 1 and fig. 2 and comprises a main shaft 4, a rotating wheel 5 arranged on the main shaft 4, a tail water taper pipe 3 arranged on the side of the rotating wheel 5 and a rear cover plate 6 arranged on the rotating wheel 5, wherein a water retaining part 2 is arranged between the tail water taper pipe 3 and the bottom of a lower ring 1 of the rotating wheel 5, and the water retaining part 2 is fixedly connected to the rear cover plate 6.

Wherein, the gap between the inner side wall of the water retaining part 2 and the bottom of the lower ring 1 of the rotating wheel 5 is 2.5-5 mm.

Wherein, the height of the water retaining part 2 is 30-40 mm.

The water retaining part 2 comprises a plurality of arc-shaped water retaining plates 202, and all the arc-shaped water retaining plates 202 form an annular water retaining part together, as shown in fig. 4. When the arc-shaped water baffle plate is installed, the inner edge of the arc-shaped water baffle plate 202 is welded on the rear cover plate 6.

The water retaining part 2 is arranged between the tail water taper pipe 3 and the bottom of the lower ring 1 of the rotating wheel 5 to improve the water pressure at the lower ring of the rotating wheel and increase the reverse thrust of the rotating wheel, so that the running bearing temperature of a combined bearing with thrust of a unit is reduced, the running reliability and safety of the unit are improved, the running and maintenance cost of a power station is reduced, and the economic benefit of the power station is improved; by adopting the structure, the water retaining part is added on the conventional horizontal mixed-flow water turbine, the temperature of the thrust bearing bush of the turbine set can be reduced by an extremely simple structure, and the technical improvement of the existing turbine set and the new construction of the turbine set are extremely favorable.

Claims

1. Horizontal mixed-flow turbine axial thrust structure, including main shaft (4) and runner (5) of setting on main shaft (4), set up tail water taper pipe (3) in runner (5) side to and set up back shroud (6) on runner (5), its characterized in that: a water retaining part (2) is arranged between the tail water taper pipe (3) and the bottom of the lower ring (1) of the rotating wheel (5), and the water retaining part (2) is fixedly connected on the rear cover plate (6).

2. The axial thrust structure of the horizontal mixed-flow water turbine according to claim 1, characterized in that: the gap between the inner side wall of the water retaining part (2) and the bottom of the lower ring (1) of the rotating wheel (5) is 2.5-5 mm.

3. The axial thrust structure of the horizontal mixed-flow water turbine according to claim 2, characterized in that: the height of the water retaining part (2) is 30-40 mm.

4. The axial thrust structure of the horizontal mixed-flow water turbine according to claim 1, 2 or 3, characterized in that: the water retaining part (2) is a water retaining ring (201).

5. The axial thrust structure of the horizontal mixed-flow water turbine according to claim 1, 2 or 3, characterized in that: the water retaining part (2) comprises a plurality of arc-shaped water retaining plates (202), and all the arc-shaped water retaining plates (202) surround to form an annular water retaining part.