CN201757019U

CN201757019U - Water turbine impeller structure

Info

Publication number: CN201757019U
Application number: CN201020166701XU
Authority: CN
Inventors: 刘渊毅; 黄志达; 郭艇; 郑明华; 刘君君; 刘薇; 潘清青; 伍月恩
Original assignee: SANMING CITY YIJUN MACHINERY FOUNDRY CO Ltd
Current assignee: SANMING CITY YIJUN MACHINERY FOUNDRY CO Ltd
Priority date: 2010-04-22
Filing date: 2010-04-22
Publication date: 2011-03-09
Anticipated expiration: 2020-04-22

Abstract

A water turbine impeller structure relates to improvement of the rotating wheel vane of water turbine. The water turbine impeller structure comprises an integrated shaft sleeve and vanes, and is characterized in that a radial protruding reinforced rib is extended at the center of the back of a half-bowl bucket along the radial direction of the shaft sleeve, the root of the reinforced rib is integrated with the shaft sleeve, the rear-half outer profile of the reinforced rib is perpendicular to the excircle of the shaft sleeve, the front-half of the reinforced rib is of a radial outward curved surface similar to the curved surface of back of the vanes on the corresponding part. The water turbine impeller structure is advantageous in that the reinforced rib strengthens the bearing capacity of the vanes and improves the anti-corrosion performance for steam bubbles, thereby prolonging the service lifetime of the vanes. Moreover, from a mechanics point of view, W-shaped bucket is also capable of strengthening the bearing capacity and improving the anti-corrosion performance for steam bubbles as the reinforced rib does. The arched protruding plate in the middle of the W-shaped bucket splits water flow and a dual-bucket shaped vane bears forces evener than a single-bucket shaped vane, thereby having better anti-corrosion performance for steam bubbles on the inner bottom than a single-bucket shaped vane.

Description

A kind of turbine impeller structure

Technical field:

The utility model relates to a kind of improvement of runner bucket structure of water turbine.

Background technique:

The working principle of general radial impact formula water turbine is to introduce high-pressure water flow by penstock, and then pressure energy that this strand current bring is transformed into free jet, be subjected to the bucket guide functions during water impact water conservancy diversion bucket and change the size and Orientation of pressure and flow velocity, and runner bucket is produced reaction, the running torque that forms runner makes water turbine work.

Blade wheel structure is made up of the linking body structure of axle sleeve and blade, and several blades are distributed in the sleeve outer circle radially outward and extend, and the single-wheel blade shape is a hemisphere shelly water bucket type shape at present.

Current produce rapid circular movement by pressure runner steer drive to direct impact bucket, and the size and Orientation of flow velocity is also in continuous variation.In the hydraulic turbine operation process, along with the increase of impeller operation speed, pressure increases, and when arriving to a certain degree, water begins vaporization, and a large amount of steam bubbles continuously produce and crumble and fall, and the repeated stock of current particle is seriously damaged the metal surface of flow channels.Steam bubble is compressed under pressure simultaneously, because volume-diminished, the current particle clashed into mutually when vaporization destroyed, and causes that local temperature raises (can reach 300 ℃), and the oxygen atom of steam bubble and metal generation chemical reaction cause corrosion; Because temperature raises, and producing electrolysis acts on and the generation chemical corrosion, the result of corrosion has weakened the blade bearing capacity simultaneously.

Water turbine is in running, and the basic identical nip of its blade surface pressure distribution, backside pressure are by negative on the occasion of dropping to, and when crossing the blade middle part, continuation descends and reaches max vacuum.After this, surface pressure raises one after another, forms immense pressure with the outlet port channelling of flow.Vacuum side of blade is produced high pressure, and then cause the blade back to destroy.

Summary of the invention:

The purpose of this utility model is to overcome above-mentioned defective, and a kind of turbine impeller structure is provided.

Scheme of the present utility model is: radially extending in hemisphere shelly bucket vacuum side of blade centre along axle sleeve radial protrusion reinforcement gusset, this gusset root and axle sleeve disjunctor, the latter half of external profile surface of this gusset is perpendicular to sleeve outer circle, curved curved surface of gusset first half gabarit and vacuum side of blade rounding off.

Advantage of the present utility model is: the blade bearing capacity has been strengthened in being provided with of gusset, has also strengthened anti-steam bubble corrosion ability, prolongs blade working life.Simultaneously, the setting of W shape bucket plays reinforcement bearing capacity and anti-cavitation characteristic equally with gusset from mechanics, W shape bucket intermediate projections arc plate makes the current shunting, be that the stressed relative monobucket formula blade of twin-bucket shape blade inner concave is stressed more to be tending towards balanced, thereby improved monobucket formula intracavity bottom central authorities anti-cavitation characteristic.

Description of drawings:

Fig. 1 is the prior art structural representation.

Fig. 2 is the A-A cutaway view Amplified image of Fig. 1.

Fig. 3 is the utility model structural representation.

Fig. 4 is the B-B cutaway view Amplified image of Fig. 3.

Embodiment:

Structure of the present utility model comprises the axle sleeve (1) and the blade (3) of disjunctor, it is characterized in that: radially extending in hemisphere shelly bucket blade (3) back side centre along axle sleeve (1) radial protrusion reinforcement gusset (2), this gusset (2) root and axle sleeve (1) disjunctor, the latter half of external profile surface of this gusset (2) is perpendicular to axle sleeve (1) cylindrical, curved curved surface of gusset (2) first half gabarit and blade (3) back side rounding off.

Blade (3) inner chamber radially central authorities extend and a arc plate perpendicular to axle sleeve (1) shaft axis, the circumferential cross-section that this arc plate and blade (3) form is the W shape; Arc plate top and blade (3) are contour at the rim of a bowl.

In the process of water turbine work, current enter runner by tail pipe, water turbine is done work, 18 impellers of direct flush water turbine, the jet that enters in the impeller bucket is very serious to the erosion of bucket root, distinctive reinforcing rib structure has been resisted jet washing away impeller effectively, such design has guaranteed on the mechanics, such design has thoroughly changed the force structure of the runner bucket (3) in the traditional water turbine working procedure, and hold water area and water guide direction by direct increasing, change the surplus water trend of original impulse turbine, guide channel smoothly not only is provided, also so significantly reduced and do not carried current, the running efficiency of water turbine and operating life are improved directly the washing away and corrode of blade (3) (bucket) root.

Claims

1. turbine impeller structure, the axle sleeve (1) and the blade (3) that comprise disjunctor, it is characterized in that: radially extending in hemisphere shelly bucket blade (3) back side centre along axle sleeve (1) radial protrusion reinforcement gusset (2), this gusset (2) root and axle sleeve (1) disjunctor, the latter half of external profile surface of this gusset (2) is perpendicular to axle sleeve (1) cylindrical, curved curved surface of gusset (2) first half gabarit and blade (3) back side rounding off.

2. a kind of turbine impeller structure according to claim 1 is characterized in that: blade (3) inner chamber radially central authorities extend and a arc plate perpendicular to axle sleeve (1) shaft axis, the circumferential cross-section that this arc plate and blade (3) form is the W shape; Arc plate top and blade (3) are contour at the rim of a bowl.