CN100436811C

CN100436811C - Turning wheel used for mixed flow turbine

Info

Publication number: CN100436811C
Application number: CNB2004100429795A
Authority: CN
Inventors: 托马斯·卡赫尔
Original assignee: Voith Siemens Hydro Power Generation GmbH and Co KG
Current assignee: Germany Voith Holdings Limited
Priority date: 2003-06-06
Filing date: 2004-06-04
Publication date: 2008-11-26
Anticipated expiration: 2024-06-04
Also published as: CN1573090A; DE10325698A1; DE10325698B4

Abstract

A rotor (1) for a Francis turbine comprises rotor blades (2) having curved leading and trailing edges and a rim and a base. In the turning direction the connection of the leading edge to the rim (A) matches the connection (C) of the edge to the base.

Description

The runner that is used for Francis turbine

Technical field

The present invention relates to a kind of water conservancy machine, especially relate to a kind of mixed-flow (Francis formula) water turbine.

Background technique

Working efficiency and operating range to this water turbine proposed higher requirement at present.People expect that this water turbine can both use under the situation of different water flows from partial load to the overload state.

The technician is is also researching and solving the cavitation erosion problem.To this, the shape of blade plays an important role.Made a lot of effort in these areas,, especially reduced the danger of cavitation erosion, as described in the WO 98/05863 by the design of blade by designing corresponding runner.

Summary of the invention

The objective of the invention is to propose a kind of runner (also can be described as turbine) of water turbine of mixed-flow, in all loading ranges, have high efficient as far as possible, and compare the danger that can reduce cavitation erosion with runner of the prior art.

Purpose of the present invention realizes that by the runner that is provided for Francis turbine this runner comprises: a plurality of blades, each described blade comprise into the water limit and go out the waterside; And runner edge and runner bottom; Described blade between runner edge and runner bottom, and and described runner edge and runner bottom link to each other; The described water inlet limit of described blade is curved shape on plan view and/or side view; Described curved section comprises turning point W1, W2, at least one among the W3 (comprise a turning point W1 at least, W2, W3); From sense of rotation (along rotating shaft), the tie point C (tie point A is identical with tie point C phase place) on same position on the tie point A on described runner edge and described water inlet limit and described runner bottom and described water inlet limit, perhaps the A point is after the C point.

According to the present invention, each blade all is designed to a specific structure, and the water inlet limit is curved shape in plan view, because the water inlet limit comprises a turning point on profilogram, like this, two bending sections can be connected mutually.In addition, from side view, be provided with into water limit and the tie point of runner edge and the tie point of water inlet limit and runner bottom respectively in a particular manner.The tie point of water inlet limit and runner bottom from sense of rotation, is positioned at same position with the tie point of water inlet limit and runner edge.The position of the tie point of water inlet limit and runner bottom also can be preceding.

Description of drawings

Below in conjunction with accompanying drawing the present invention is explained in detail, will describes respectively below.

Fig. 1 shows the Francis turbine of axial cross section.

Fig. 2 show according to the rotary wheel of water turbine of Fig. 1 from amplification profile diagram perpendicular to the direction (side view) of water turbine rotating shaft.

Fig. 3 shows the side perspective view according to second embodiment of runner of the present invention.

Fig. 4 shows the side perspective view according to the 3rd embodiment of runner of the present invention.

Fig. 5 shows the plan view according to the 4th embodiment of turbine blade of the present invention.

Fig. 6 shows the plan view according to the 5th embodiment of turbine blade of the present invention.

Fig. 7 shows the runner that is used for Francis turbine according to of the present invention.

Embodiment

The structure of the Francis turbine among Fig. 1 is as described below.

Runner 1 comprises a plurality of blades 2, and runner 1 is 3 rotations around the shaft.

Runner 1 by a spiral case 4 around.In addition, connect (connection) before the flange of stator 5 and the runner 1.

Runner 1 has intake pipe 6, and this intake pipe 6 comprises into water Diffuser (also claiming diffuser) 6.1, the bend pipe 6.2 that enters Diffuser 6.1 connections and the inlet water tank 6.3 that is connected with described bend pipe 6.2.

The water inlet limit 2.1 that Fig. 2 shows blade 2 is at the enlarged view perpendicular to the direction of rotating shaft 3.Blade 2 is between runner bottom 1.1 and runner edge 1.2.Its in the scope on described water inlet limit 2.1 (water inlet limit 2.1 of blade 2 just) joins with the runner edge with the runner bottom by welding or forms (being that mechanical fixation is connected) with runner bottom and runner edge integral body.The tie point A and the tie point C that is connected runner bottom 1.1 and water inlet limit 2.1 that as can be seen from the figure connect runner edge 1.2 and water inlet limit 2.1.These two tie point A and C are positioned at same position along the sense of rotation 3.1 of runner 1.If A point and C o'clock are coupled together by a line, like this, this line is parallel with rotating shaft 3.

But according to the present invention, tie point C also can be positioned at before the tie point B.Like this, in 3.1 rotations in rotational direction, the C point is ahead of the B point.

In addition, as can be seen, the water inlet limit is forniciform, and at this moment, it has two turning points (being also referred to as flex point).

Second embodiment shown in Fig. 3 is similar to the embodiment among Fig. 2.Equally, as can be seen, runner bottom 1.1 and runner edge 1.2 and between the blade between the two 2.Water inlet limit 2.1 has a turning point, and the shape that goes out waterside 2.2 is then opposite with it linearly.

Tie point A equally as can be seen, at tie point A place, blade 2 (just, the water inlet limit 2.1 of blade 2) in the scope on its water inlet limit 2.1 links to each other with runner edge 1.2, and 1.1 are connected bottom tie point C point place and runner.

Line (shown in dotted line) by tie point A and tie point C is parallel or almost parallel with rotating shaft 3 with rotating shaft 3.

Mode of execution according to Fig. 4 is identical with the mode of execution of Fig. 3, and still, the line of tie point A and tie point C slightly tilts with respect to rotating shaft 3.

Fig. 5 and Fig. 6 show two embodiments' plan view respectively.Also show the blade profile 1.1.1 of runner bottom 1.1 and the blade profile 1.2.1 of runner edge among the figure.

Under these two kinds of situations, water inlet limit 2.1 has demonstrated the curve with turning point, and this curve approaches S-shaped.

Fig. 3 to Fig. 6 also shows the tie point that goes out waterside 2.2 that is connected in runner bottom and runner edge.Blade 2 (just, the water inlet limit 2.2 of blade 2) and runner bottom 1.1 in the scope that goes out waterside 2.2 links to each other at D point place, links to each other at B point place with runner edge 1.2.

Go out the waterside and can have outline of straight line or curved profile, it has and the 2.1 close or identical designs of water inlet limit equally.

See that along sense of rotation tie point B can lead over another one tie point D.But, be that to be ahead of tie point B also be possible to tie point D conversely.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Label list

1 runner

1.1 runner bottom

1.1.1 runner bottom profile

1.2 runner edge

1.2.1 the profile of runner edge

2 blades

2.1 water inlet limit

2.2 outlet edge

3 rotating shafts

3.1 sense of rotation

4 spiral cases

5 stators

6 intake pipes

6.1 water inlet Diffuser

6.2 bend pipe

6.3 inlet water tank

W1, W2, W3 turning point

A in water inlet limit scope blade and the tie point of runner edge

B is connected in the tie point that the waterside of runner edge

C is connected in the tie point on the water inlet limit of runner bottom

D is connected in the tie point that the waterside of runner bottom

Claims

1. runner (1) that is used for Francis turbine comprising:

A plurality of blades (2), each described blade (2) comprise into water limit (2.1) and go out waterside (2.2);

Runner edge (1.2) and runner bottom (1.1);

Described blade (2) between runner edge (1.2) and runner bottom (1.1), and and described runner edge (1.2) and runner bottom (1.1) link to each other;

The described water inlet limit (2.1) of described blade (2) is curved shape on plan view and/or side view; It is characterized in that:

Described curved section comprise at least one turning point (W1, W2, W3);

From sense of rotation (3.1), the tie point (C) on the tie point (A) on described runner edge (1.2) and described water inlet limit (2.1) and described runner bottom (1.1) and described water inlet limit (2.1) is on same position, and the tie point (C) on the tie point (A) on perhaps described runner edge (1.2) and described water inlet limit (2.1) (1.1) and described water inlet limit (2.1) bottom described runner afterwards.

2. runner according to claim 1 is characterized in that:

From sense of rotation, described runner edge (1.2) and the described tie point (B) that goes out waterside (2.2) and described runner bottom (1.1) and the described tie point (D) that goes out waterside (2.2) be at same position, and (1.1) and the described tie point (D) that goes out waterside (2.2) be before or afterwards bottom described runner for perhaps described runner edge (1.2) and the described tie point (B) that goes out waterside (2.2).