CN2888113Y

CN2888113Y - Structure for control of super-cavitation in guide blade turbine of hydraulic turbine

Info

Publication number: CN2888113Y
Application number: CNU2006200787357U
Authority: CN
Inventors: 廖伟丽; 罗兴锜; 梁武科; 谭坤
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2006-04-06
Filing date: 2006-04-06
Publication date: 2007-04-11
Anticipated expiration: 2016-04-06

Abstract

The utility model discloses a supercavitation flow control structure inside the guide vane of a water turbine. Inside the guide vane, there are independent air supply cavities at the head, middle and tail respectively. The three air supply cavities are located on a plane to form a supplementary The air cavity layer divides the inside of the guide vane into the guide vane ventilation layer and the guide vane air supply hole layer. The three air supply cavities respectively have air supply holes connected with the external air supply device, and the bottom of the guide vane air supply hole layer has a guide There are a plurality of gap air supply holes communicating with the corresponding air supply cavities on the concave surface of the blade gap concave platform and the concave surface of the guide vane gap concave platform corresponding to the head air supply cavity, the middle part air supply cavity and the tail air supply cavity. By inflating the three air supply cavities respectively, adjusting the pressure and flow rate of each air supply hole, the gap flow at the end surface of the guide vane is prevented, thereby solving the blade damage caused by the supercavitation phenomenon.

Description

The mobile control structure of the inner supercavitation of a kind of guide vanes of water turbine

Technical field

The utility model belongs to water turbine manufacturing technology field, relates to a kind of guide vanes of water turbine, particularly eliminates stator end clearance cavitation flow phenomenon and the control structure that causes stator end face, base ring, blade to destroy.

Background technique

At present for water turbine, because the phenomenon that guide vanes of water turbine end clearance cavitation flows makes stator end face, base ring, runner bucket import by following ring place cavitation and abrasion often take place, and then causes the water turbine repair cycle to shorten, particularly in high head hydraulic turbine, this phenomenon is especially serious.The prior art employing reduces abrasion in the mode that base ring installs wearing plate, facing plate additional, but this mode is little to the cavitation and the abrasion preventive and therapeutic effect at other positions such as stator end face, does not have and guarantees water turbine safe operation and the purpose that increases the service life.

Summary of the invention

The purpose of this utility model provides the inner supercavitation of a kind of guide vanes of water turbine control structure that flows, and efficiently solves because cavitation and abrasion cause the problem of blade destruction.

The technological scheme that the utility model adopted is, the mobile control structure of the inner supercavitation of a kind of guide vanes of water turbine, in stator inside, the head of corresponding stator, the middle part, afterbody has independently head tonifying Qi cavity, middle part tonifying Qi cavity and afterbody tonifying Qi cavity, head tonifying Qi cavity, middle part tonifying Qi cavity and afterbody tonifying Qi cavity are positioned at a plane, constitute the tonifying Qi cavity layer, the tonifying Qi cavity layer is divided into stator unsaturated zone and stator tonifying Qi hole layer with stator inside, head tonifying Qi cavity, middle part tonifying Qi cavity and afterbody tonifying Qi cavity are respectively by being communicated with to device of air to pore and outside, the bottom of stator tonifying Qi hole layer has the clearance between guide vanes concave station, on the concave surface of clearance between guide vanes concave station with head tonifying Qi cavity, middle part tonifying Qi cavity and afterbody tonifying Qi cavity corresponding part have tonifying Qi hole, a plurality of gap, and tonifying Qi hole, gap communicates with corresponding tonifying Qi cavity.

Characteristics of the present utility model also are,

Aperture D＜the 1mm in tonifying Qi hole, gap.

The utility model adopts the mode of tonifying Qi as the means of improving; carry out tonifying Qi respectively by head tonifying Qi cavity, middle part tonifying Qi cavity and the afterbody tonifying Qi cavity that stator inside is opened; making place, stator end clearance produce supercavitation flows; by tonifying Qi hole, gap the pressure and the flow of tonifying Qi are adjusted again; make supercavitation gas surround the stator end face; eliminate and weakened the generation of flowing in the stator end clearance, thereby played protective action stator.

Description of drawings

Fig. 1 is a structural representation of the present utility model, and wherein a is a plan view, and b is a worm's eye view.

Among the figure, 1. stator unsaturated zone, 2. stator tonifying Qi cavity layer, 3. stator tonifying Qi hole layer is 4. given pore, 5. tapped hole, 6. clearance between guide vanes concave station, 7. gap tonifying Qi hole, 8. head tonifying Qi cavity, 9. middle part tonifying Qi cavity, 10. afterbody tonifying Qi cavity.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is elaborated.

As shown in drawings, the mobile control structure of the inner supercavitation of guide vanes of water turbine of the present utility model, in stator inside, bottom at the tapped hole 5 that is connected with axle, the head of corresponding stator, the middle part, afterbody is opened three separate cavitys respectively: head tonifying Qi cavity 8, middle part tonifying Qi cavity 9 and afterbody tonifying Qi cavity 10, these three cavitys are positioned at a plane, constitute tonifying Qi cavity layer 2, three tonifying Qi cavitys are respectively by being communicated with to device of air to pore 4 and outside, three tonifying Qi cavitys are carried out tonifying Qi respectively under the condition that is independent of each other mutually, the external world makes gas arrive this three cavitys to device of air by giving pore 4, three cavitys carry out whole pressure equalization to the air that transmits, and the pressure in the cavity has just kept a more stable level.Tonifying Qi cavity layer 2 is divided into the stator unsaturated zone 1 on top and the stator tonifying Qi hole layer 3 of bottom with stator inside, the bottom of stator tonifying Qi hole layer 3 has clearance between guide vanes concave station 6, have the tonifying Qi hole, gap 7 that a plurality of and corresponding tonifying Qi cavity communicates with head tonifying Qi cavity 8, middle part tonifying Qi cavity 9 and afterbody tonifying Qi cavity 10 corresponding parts on the concave surface of clearance between guide vanes concave station 6, tonifying Qi is carried out in the gap, the aperture D＜1mm in control gap tonifying Qi hole 7 with convenient.When clearance between guide vanes being carried out tonifying Qi, can adjust the tonifying Qi pressure and the flow of different tonifying Qi parts by control switch by these little tonifying Qi holes.

To adopt the stator of the utility model structure to be installed on the stator distribution circle, adjust stator and be positioned at a certain entrance angle, the gap of given 0.25mm;

Water turbine moves under the condition of nature, measures speed of incoming flow, earlier head tonifying Qi cavity 8 is inflated by the pore 4 of giving that communicates with head tonifying Qi cavity 8 to device of air, makes it that cavitation take place;

The pore 4 of giving that will communicate with middle part tonifying Qi cavity 9 is then opened, and middle part tonifying Qi cavity 9 is inflated, and adjusts tonifying Qi pressure and flow, up to take place supercavitation existing to;

The pore 4 of giving that will communicate with afterbody tonifying Qi cavity 10 is again opened, and afterbody tonifying Qi cavity 10 is inflated, and adjusts tonifying Qi pressure and flow, weakens up to the supercavitation phenomenon;

Adjust the pressure and the flow in each tonifying Qi hole, gap 7 at last, till supercavitation gas surrounds the stator end face fully.

In the hydraulic turbine operation process, the pressure and the flow in tonifying Qi hole, adjusting play 7 allow the supercavitation bubble surround the stator end face all the time fully, thereby reach the effect that stops the stator end clearance to be flowed fully.

Claims

1. A supercavitation flow control structure inside the guide vane of a water turbine is characterized in that, inside the guide vane, the head, middle part and tail of the corresponding guide vane are respectively provided with an independent head air supply cavity (8), the middle part The air supply cavity (9) and the tail supply cavity (10), the head supply cavity (8), the middle supply cavity (9) and the tail supply cavity (10) are located on a plane, Constitute the air-supplement cavity layer (2), the air-supplement cavity layer (2) divides the inside of the guide vane into the guide vane ventilation layer (1) and the guide vane air-supplement hole layer (3), the head air-supplement air The chamber (8), the central air supply cavity (9) and the rear air supply cavity (10) communicate with the external air supply device through the air supply hole (4) respectively, and the bottom of the guide vane air supply hole layer (3) is open There is a guide vane gap recess (6), and the concave surface of the guide vane gap recess (6) corresponds to the head air supply cavity (8), middle air supply cavity (9) and tail air supply cavity (10) There are a plurality of interstitial air supply holes (7), and the interstitial air supply holes (7) communicate with corresponding air supply cavities.

2. The supercavitation flow control structure according to claim 1, characterized in that, the aperture diameter D<1mm of the gap air supply hole (7).