CN202250582U

CN202250582U - Regulating and controlling device of leakage-stopping sealed gap of high-head radial-axial flow turbine runner

Info

Publication number: CN202250582U
Application number: CN2011202810359U
Authority: CN
Inventors: 王耀洲
Original assignee: NORTHWEST HYDRO CONSULTING ENGINEERS CHECC
Current assignee: NORTHWEST HYDRO CONSULTING ENGINEERS CHECC; PowerChina Northwest Engineering Corp Ltd
Priority date: 2011-08-04
Filing date: 2011-08-04
Publication date: 2012-05-30
Anticipated expiration: 2021-08-04

Abstract

The utility model belongs to the hydraulic mechanical engineering and particularly relates to a regulating and controlling device of a leakage-stopping sealed gap of a high-head radial-axial flow turbine runner, which is characterized in that: the back side of a water turbine movable guide blade is connected with pressure regulating pipes and two paths of the pressure regulating pipes are respectively communicated with a hollow cavity enclosed by arc-shaped steel plates; the two paths of the pressure regulating pipes are communicated with the hollow cavity to form a symmetrical distribution with the axis of a water turbine; the two paths of the pressure regulating pipes are semi-annular pipes and are divided into two groups from the middle of the semi-annular pipes, surrounded by basic rings in front and back and are symmetrically connected into the hollow cavity with the axis of the water turbine; the pressure regulating pipes outwards stretch out from bottom rings of the water turbine and then respectively enter into one end of a linear shape opening of a three-way pipe; the other end of the linear shape opening enters into a tail water pipe through a second spherical valve and a second overhauling valve; and a T-shaped opening of the three-way pipe enters into the two paths of the pressure regulating pipes after passing through a third overhauling valve. The regulating and controlling device provided by the utility model overcomes the defects in the prior art that the machine lifting force or the hydraulic thrust is too great due to the deviation between the designed size of the leakage-stopping sealed gap and the actual size of the leakage-stopping sealed gap.

Description

The regulating controller of high head francis turbine runner leak-stopping seal clearance

Technical field

The utility model belongs to the hydraulic machinery engineering, particularly a kind of regulating controller of high head francis turbine runner leak-stopping seal clearance.

Background technique

High head francis turbine runner blade is narrower long again, and the runner inlet diameter is greater than discharge diameter of runner, because operating head polishing is high; The axial hydraulic thrust of water turbine often is the emphasis that the designer pays close attention in design process; The measure of generally taking is that the decompression plate is set on top cover, and the runner epicoele is provided with wing pump, makes leaking of crown leak-stopping seal clearance design as far as possible little; And make down ring go up the water loss a little bit smaller (leaking cross-sectional area more greatly) of leak-stopping seal clearance design; The water loss that the leak-stopping seal clearance designs under the following ring is (cross-sectional area that leaks is a little bit smaller) more greatly, from then on, reduces the top cover water pressure; Increase the cavity water pressure, to such an extent as to reduce the axial hydraulic thrust of water turbine.But in actual design computational process, (boundary conditions is relevant with all operating conditionss of hydraulic turbine operation owing to the boundary conditions more complicated; Can only select some characteristic parameters as calculating during calculating, these characteristic parameters also on the basis based on model test of hydraulic turbine, also have certain difference with prototype); Adding that hydraulic loss coefficient that hydraulic loss calculate to be adopted is based on draws on the experimental basis in similar gap; Also have some differences with reality, wanting so quantitatively, accurately calculating, design is the comparison difficulty, because the uncertainty of objective reality; The water turbine of designing often certain deviation can occur in actual use; Because machine is lifted in design of ring leak-stopping seal clearance and actual deviation down when making unit operation to some operating mode, the firm trial run in some power stations is arranged like gold river power station, the Heqing County, state, Dali in Yunnan, brave loud, high-pitched sound river power station, Dehong state; The thrust-bearing hydraulic thrust is excessive, temperature raises even problem such as tile kilning takes place, and influences the stable operation of unit.

Machine should not be lifted in the normal operation of unit, can not be that hydraulic thrust is excessive, but it is so inaccurate to design time design, solves these two problems with regard to a kind of new technology of needs.

Summary of the invention

The technical problem that the utility model will solve provides a kind of regulating controller of high head francis turbine runner leak-stopping seal clearance, causes the machine of lifting or the excessive defective of hydraulic thrust to overcome the deviation owing to design of leak-stopping seal clearance and reality that exists in the existing technology.

The purpose of the utility model is to realize like this; The regulating controller of high head francis turbine runner leak-stopping seal clearance; It is characterized in that: the water turbine movable guide vane connects surge pipe at the back; Surge pipe divides two-way to communicate with the cavity that curved plate is surrounded respectively, and two-way surge pipe to cavity and turbine shaft are linear in a symmetrical arrangement.

Described two-way surge pipe, shape are the ring-like pipes of semicircle, and by being divided into two-way in the middle of the ring-like pipe of semicircle, front and back are inserted in the cavity with water turbine axis symmetry around foundation ring.

After stretching out from the water turbine base ring, described surge pipe gets into 1-shaped open one end of three-way pipe downwards respectively through first service valve and first ball valve; Got in the draft tube through second ball valve and second service valve by the 1-shaped open the other end, three-way pipe T word mouth is through getting into the two-way surge pipe behind the 3rd service valve.

Described surge pipe is that DN50 is to the high-pressure water pipe between the DN80.

Be connected with pressure gauge on the described cavity.

The technological scheme of the utility model is: be to draw a surge pipe at the back by the water turbine movable guide vane to divide and encircle and connect cavity that manometric position curved plate surrounded under two-way and water turbine foundation ring, the runner and link to each other and link to each other with draft tube; Pipeline is provided with first ball valve and second ball valve that is used to regulate the cavity water pressure, and on cavity, is provided with the pressure gauge that is used for pressure regulation observation.Be provided with three service valves in order to overhaul the ball valve pipeline, before wherein first service valve was arranged at first ball valve, after second service valve was arranged at second ball valve, the 3rd service valve was arranged on the house steward who connects cavity.

The technique effect of the utility model is:

1, can prevent that the design of high head Francis turbine leak-stopping seal clearance from going up and actual deviation causes machine lifting of water-turbine generator set or the excessive device and method that influences the stable operation of unit of hydraulic thrust;

2, simple in structure, safe and reliable;

3, the utility model links to each other with cavity in line arrangement and adopts and the water turbine symmetric arrangement, its objective is to cavity internal water pressure and turbine shaft are distributed symmetrically and evenly, satisfies the set steady service condition.

Description of drawings

Below in conjunction with embodiment's accompanying drawing the utility model is described further:

Fig. 1 is that surge pipe is arranged perspective view among Fig. 2;

Fig. 2 is the utility model example structure schematic representation.

Reference character is following:

First ball valve, 2. second ball valve, 301. first service valves, 302. second service valves, 303. the 3rd service valves, 4. surge pipe, 5. pressure gauge, 6. time ring is gone up leak-stopping seal clearance, 7. time ring leak-stopping seal clearance, 8. cavity, 9. movable guide vane, 10. water turbine base ring, 11. foundation rings, 12. runners ring, 13. draft tubes, 14. top covers, 15. crown leak-stopping seal clearances down down.

Embodiment

As depicted in figs. 1 and 2; The regulating controller of high head francis turbine runner leak-stopping seal clearance; Connect surge pipe 4 by water turbine movable guide vane 9 back, 4 fens two-way of surge pipe communicate with the cavity that curved plate surrounded 8 of the position that connects pressure gauge 5 respectively, and (two-way surge pipe 4: shape is the ring-like pipe of semicircle, by being divided into two-way in the middle of the ring-like pipe of semicircle; Front and back are inserted in the cavity 8 with water turbine axis symmetry around foundation ring 11).Surge pipe 4 sizes confirm that according to design general optional DN50 is to the high-pressure water pipe between the DN80.

After surge pipe 4 stretches out downwards from water turbine base ring 10 respectively through 1-shaped open one end of first service valve 301 with first ball valve 1 entering three-way pipe; Got in the draft tube 13 through second ball valve 2 and second service valve 302 by the 1-shaped open the other end, three-way pipe T word mouth gets into semicircular ring type pipe through the 3rd service valve 303 backs and inserts cavity 8.First service valve 301 is before first ball valve 1; Second service valve 302 is behind second ball valve 2, and the 3rd service valve 303 is connecting on the house steward of cavity and two ball valves (first ball valve 1, second ball valve 2), wherein; Three service valves belong to normally open valve, just when ball valve overhauls, block current and use; 2 ball valves are used to regulate cavity 8 water pressures to be used; 1 pressure gauge 5 uses as pressure regulation observation, and its purpose is just revised runner leak stoppage seal clearance design deviation, regulates the cavity water pressure and reaches design load, to satisfy set steady operation needs.

Regulate and control method based on the regulating controller of high head francis turbine runner leak-stopping seal clearance is; Through pressure gauge 5 observation cavitys 8 pressure, instantly ring go up leak-stopping seal clearance 6 relatively down ring make cavity 8 water pressures be lower than set point pressure when 7 designs of leak-stopping seal clearance are less than normal down; Axially hydraulic thrust is bigger than normal downwards for unit; Close second ball valve 2, open first ball valve 1, adjust to certain aperture; Quite make down ring go up leak-stopping seal clearance 6 and increase, increase cavity 8 water pressures, reduce axially downward hydraulic thrust of unit;

Instantly ring go up leak-stopping seal clearance 6 relatively down ring make cavity 8 water pressures be higher than set point pressure when 7 designs of leak-stopping seal clearance are bigger than normal down, axially upwards hydraulic thrust is bigger than normal for unit; Lift machine, close first ball valve 1, open second ball valve 2; Quite make down ring leak-stopping seal clearance 7 increases down; The pressure of cavity 8 is let out draft tube 13, reduces cavity 8 water pressures, makes set steady steady.

Above-mentioned adjustment is to adjust to all operating modes of unit operation, and general only adjustment once or according to leak-stopping seal clearance abrasion condition is adjusted at times, is not that each operating mode is adjusted constantly.

Claims

1. the regulating controller of high head francis turbine runner leak-stopping seal clearance; It is characterized in that: water turbine movable guide vane (9) back connects surge pipe (4); Surge pipe (4) divides two-way to communicate with the cavity that curved plate surrounded (8) of the position that connects pressure gauge (5) respectively, and two-way surge pipe (4) to cavity (8) is linear in a symmetrical arrangement with turbine shaft.

2. the regulating controller of high head francis turbine runner leak-stopping seal clearance according to claim 1; It is characterized in that: described two-way surge pipe (4); Shape is the ring-like pipe of semicircle; By being divided into two-way in the middle of the ring-like pipe of semicircle, front and back are inserted in the cavity (8) with water turbine axis symmetry around foundation ring (11).

3. the regulating controller of high head francis turbine runner leak-stopping seal clearance according to claim 1; It is characterized in that: after described surge pipe (4) stretches out downwards from water turbine base ring (10) respectively through 1-shaped open one end of first service valve (301) and first ball valve (1) entering three-way pipe; Got in the draft tube (13) through second ball valve (2) and second service valve (302) by the 1-shaped open the other end, three-way pipe T word mouth gets into semicircular ring type pipe through the 3rd service valve (303) back and inserts cavity (8).

4. the regulating controller of high head francis turbine runner leak-stopping seal clearance according to claim 1 is characterized in that: described surge pipe (4) is that DN50 is to the high-pressure water pipe between the DN80.

5. the regulating controller of high head francis turbine runner leak-stopping seal clearance according to claim 1 is characterized in that: be connected with pressure gauge (5) on the described cavity (8).