CN109296493B

CN109296493B - Mounting method of water drainage cone

Info

Publication number: CN109296493B
Application number: CN201811206720.8A
Authority: CN
Inventors: 周新
Original assignee: Jiangxi Lianhua Water Turbine Factory Co ltd
Current assignee: Jiangxi Lianhua Water Turbine Factory Co ltd
Priority date: 2018-10-17
Filing date: 2018-10-17
Publication date: 2020-07-07
Anticipated expiration: 2038-10-17
Also published as: CN109296493A

Abstract

The invention discloses a method for installing a water drainage cone, which is characterized by comprising the following steps: the method comprises the following steps: s1, placing the body on the mounting position of the rotating wheel, wherein the second mounting groove faces the rotating wheel; s2, inserting a bolt into the first mounting groove, wherein a screw rod of the bolt penetrates through the central through hole to the second mounting groove; s3, placing the inner sealing cover in the first mounting groove and covering the bolt; s4, pumping air in a closed space formed by the inner sealing cover and the inner side wall of the first mounting groove through an exhaust valve nozzle on the inner sealing cover; and S5, fixing and sealing the outer sealing cover and the notch of the first mounting groove. The invention provides an installation method of a water drainage cone, which can reduce the pressure in a gap between a rotating wheel and a volute in a drainage mode, thereby reducing the rotating resistance of the rotating wheel, prolonging the service life of the rotating wheel, reducing the maintenance frequency, preventing a locking bolt on the water drainage cone from being rusted easily, and facilitating the disassembly of the water drainage cone.

Description

Mounting method of water drainage cone

Technical Field

The invention relates to the technical field of water turbines, in particular to a method for installing a drain cone.

Background

The water turbine is an important energy conversion device for converting water flow energy into mechanical energy, and is also an important core unit for hydropower in new energy utilization. The existing water turbine mainly comprises a volute, a draft tube, a rotating wheel, a generator and a drainage cone arranged on the rotating wheel, wherein flowing water flows into the volute from a water inlet of the volute, forms high-pressure water flow after being accelerated by coiling to impact the rotating wheel, and finally is discharged into the draft tube under the diversion effect of the drainage cone, the rotating wheel is driven to rotate in the process, and then the generator is driven to rotate through a transmission shaft to generate power. Because the part of runner stretches into in the spiral case, consequently runner and spiral case rotation in-process must have the clearance of rotating, and this must can make rivers enter into the clearance of runner and spiral case, can produce a series of technical problem from this:

the first, continuous high pressure water flow will cause a high pressure to form between the runner and the volute, increasing the frictional resistance to rotation of the runner.

Secondly, foreign particles in the water flow can be brought into a gap between the rotating wheel and the volute, and long-term accumulation can cause abrasion of a contact surface between the rotating wheel and the volute, so that the service life of the rotating wheel is influenced.

The third, continuous high pressure water flow can always maintain a large axial thrust between the rotating wheel and the volute, so that the bearing of the rotating wheel can continuously bear a large axial force, which inevitably leads to accelerated wear of the bearing.

A fourth, continuous high pressure stream of water can loosen the threaded bleed cone on the runner.

Fifthly, the locking bolt between the drain cone and the runner is easy to rust.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art: the utility model provides an installation method of wash-out awl, it not only can make the clearance internal pressure between runner and the spiral case reduce through the mode of drainage to reduced runner pivoted resistance, improved the life of runner, reduced the maintenance frequency, the difficult corrosion of locking bolt on the wash-out awl moreover, it is convenient to the dismantlement of wash-out awl.

Therefore, an object of the present invention is to provide a method for installing a water drainage cone, which includes a body, a bolt, an inner sealing cover and an outer sealing cover, wherein a connecting portion is disposed on a rear end surface of the body, a first installation groove is formed by recessing a center position of a front end surface of the body, a second installation groove is formed by recessing a center position of the connecting portion, and a center through hole is disposed between the first installation groove and the second installation groove, the method including: the method comprises the following steps:

s1, placing the body on the mounting position of the rotating wheel, wherein the second mounting groove faces the rotating wheel;

s2, inserting a bolt into the first mounting groove, enabling a screw rod of the bolt to penetrate through the central through hole to the second mounting groove, and rotating the bolt to enable the body and the rotating wheel to be fixedly connected through the bolt;

s3, placing the inner sealing cover in the first mounting groove and covering the bolt;

s4, pumping air in a closed space formed by the inner sealing cover and the inner side wall of the first mounting groove through an exhaust valve nozzle on the inner sealing cover;

s5, placing the outer sealing cover in the first mounting groove, and fixing and sealing the outer sealing cover and the notch of the first mounting groove. Because the sluicing awl is along with the high-speed pivoted of runner, therefore sealed lid of ordinary can't satisfy sealed demand, still can lead to the bolt corrosion when high-pressure rivers seepage to first mounting groove in, and sealed lid through the ectonexine not only can be fine sealed but also because the region at bolt place carries out the evacuation through interior sealed lid, consequently is difficult for the corrosion.

According to an example of the present invention, the outer sealing cover includes a thermal insulation layer and a welding layer, wherein step S5 includes the following steps:

s51, laying the heat insulation layer on the inner sealing cover;

s52, placing solder above the heat insulation layer, wherein the solder covers the notch of the first mounting groove;

and S53, heating the solder by a gas welding gun to soften the solder to form a welding layer, wherein the welding layer seals the notch of the first mounting groove. The interior sealed lid forms the vacuum through pumping out, consequently good to the protective effect of bolt, and can make first mounting groove form inclosed space through the welded layer, consequently sealed effectual, can not take place the condition of gas leakage.

According to an example of the invention, the body is provided with a front end face and a rear end face, the cross-sectional area of the front end face is smaller than that of the rear end face, and the front end face and the rear end face are in transitional connection through the flow guide face.

According to an example of the invention, a groove is formed outside the connecting part on the rear end face of the body, a plurality of connecting pipes are arranged in the body, one ends of the connecting pipes are communicated with the groove, and the other ends of the connecting pipes extend to the flow guide surface along the length direction of the connecting pipes.

According to an example of the invention, the groove extends in the circumferential direction of the connection portion to form an annular groove.

According to an example of the invention, the groove extends along the circumferential direction of the connecting part to form a circular arc-shaped groove, the number of the grooves is multiple, and all the grooves are arranged at intervals along the circumferential direction of the connecting part. The design of the grooves is that the respective connecting pipes correspond to the respective water inlet sources one to one, so that the difference of the water outlet pressure in different connecting pipes can achieve the balance of stress by using the change of the positions of the connecting pipes.

According to one example of the invention, any two adjacent grooves are communicated through a connecting groove, and the cross-sectional area of the connecting groove is smaller than that of the groove. The connection grooves are arranged, so that the situation that the pressure in the corresponding groove is continuously higher after part of the connection pipes are blocked can be avoided, and local high-pressure shunting is realized.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

The technical scheme has the following advantages or beneficial effects: at first, through set up the connecting pipe on the sluicing awl consequently can be with the ponding pressure release in the runner on the hydraulic turbine, reach the effect that reduces pressure, and the design through the recess can make the sluicing awl rotate the in-process connecting pipe of screwing up can through the recess all the time with the source intercommunication of intaking, promptly with the pipeline intercommunication on the runner, secondly, can make the difficult corrosion of locking bolt through the cooperation of interior sealed lid and outer seal lid, the maintenance process of being convenient for is to the dismantlement of sluicing awl.

Drawings

FIG. 1 is a schematic view of the construction of a wash-out cone of the present invention.

FIG. 2 is a schematic bottom view of the weep cone of the present invention.

FIG. 3 is a schematic bottom view of another configuration of the bleed cone of the present invention.

The gas exhaust valve comprises a body, a front end face, a rear end face, a flow guide face, a connecting portion, a groove, a connecting pipe, a connecting groove, a first mounting groove, a second mounting groove, a connecting pipe, a connecting groove, a first mounting groove, a second mounting groove, a connecting pipe, a central through hole, a bolt, a connecting groove.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A wash water cone for a water turbine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The first embodiment is as follows:

the invention provides a water drainage cone which comprises a body as shown in figure 1, wherein the cross section area of a front end surface 1.1 of the body is smaller than that of a rear end surface 1.2, the front end surface 1.1 and the rear end surface 1.2 are in transitional connection through a flow guide surface 1.3, the center position of the rear end surface 1.2 of the body is outwards protruded along the axial direction to form a connecting part 2, a groove 3 is arranged outside the connecting part 2 on the rear end surface 1.2 of the body, a plurality of connecting pipes 4 are arranged in the body, one ends of the connecting pipes 4 are communicated with the groove 3, and the other ends of the connecting pipes 4 extend to penetrate through the flow guide surface 1.3 along the length direction of the connecting pipes. The central point of the preceding terminal surface of body puts the indent and forms first mounting groove 6, the central point of connecting portion 2 puts the indent and forms second mounting groove 7, be equipped with a central through-hole 8 between first mounting groove 6 and the second mounting groove 7 for the screw rod part that supplies locking bolt 9 passes, be equipped with an interior sealed lid 10 in the first mounting groove 6, surround between the inslot wall of interior sealed lid 10 and first mounting groove 6 and form a sealed appearance chamber, be used for holding bolt 9's spiral shell head part, be equipped with the exhaust valve mouth 11 that is used for taking out the interior air of first mounting groove 6 on the interior sealed lid 10, the top of interior sealed lid 10 is equipped with the outer sealing cover.

Example two:

the basic mechanism is the same as the first embodiment, and the difference is that: the groove 3 as shown in fig. 2 extends in the circumferential direction of the connecting portion 2 to form an annular groove.

Example three:

the basic mechanism is the same as the first embodiment, and the difference is that: the grooves 3 shown in fig. 3 extend in the circumferential direction of the connecting portion 2 to form a plurality of circular-arc-shaped grooves 3, and all the grooves 3 are arranged at intervals in the circumferential direction of the connecting portion 2.

Example four:

the basic mechanism is the same as the first embodiment, and the difference is that: any two adjacent grooves 3 are communicated through a connecting groove 5, and the cross section area of the connecting groove 5 is smaller than that of each groove 3. Preferably, the cross-sectional area of the connecting groove 5 is equal to the cross-sectional area of 1/4 circular arc-shaped groove 3. The core purpose of this design is to make a single pipeline on the runner of hydraulic turbine correspond to a recess 3 on the wash-out awl to correspond respective connecting pipe 4, and a plurality of connecting pipes 4 are not parallel design in the runner, thereby through the dislocation distribution of connecting pipe 4 and the angle design between the water outlet end water jet direction of connecting pipe 4 and the horizontal plane thereby the holistic force balance of regulation runner with the help of the difference of the water pressure in different connecting pipes 4.

Example five:

the basic mechanism is the same as the first embodiment, and the difference is that: the outer sealing cover comprises a heat insulation layer 12 and a welding layer 13, the welding layer 13 is welded and fixed with a notch of the first installation groove 6 and seals the first installation groove 6, and the heat insulation layer 12 is arranged between the inner sealing cover 10 and the welding layer 13. Compared with the conventional single sealing cover, the sealing cover of the present invention has the advantages that the conventional sealing cover cannot achieve a good sealing effect, and the service environment of the water turbine is often a high-pressure humid environment, so that water flows into the connecting gap between the sealing cover and the first mounting groove 6 under a high-pressure condition. If the direct filler shutoff that adopts, then can make the nut part bonding of filler and bolt, unable fine dismantlement wash-out awl. In the invention, the exhaust valve nozzle on the inner sealing cover can well pump out the direct humid air between the first mounting groove 6 and the inner sealing cover, so that the bolt 9 is in a vacuum environment and is not easy to rust, and the outer sealing cover structure with the welding layer 13 can be used for plugging the first mounting groove 6, therefore, the sealing effect is good and the leakage cannot be caused along with long-term use. Meanwhile, the heat insulation layer is arranged, so that the inner sealing cover 10 can be well prevented from being damaged by the welding layer in the welding process.

Certainly, in the matched use process of the drainage cone, the drainage and drainage purposes are achieved by means of the communication between the pipeline in the rotating wheel and the gap between the rotating wheel and the volute, but the applicant of the integral rotating wheel and volute structure has already filed an application, so that the application of the invention only describes the structure of the drainage cone.

An installation method based on the drain cone structure comprises the following steps:

s1, placing the body on the mounting position of the rotating wheel, wherein the second mounting groove 7 faces the rotating wheel;

s2, inserting a bolt 9 into the first mounting groove 6, enabling a screw rod of the bolt 9 to penetrate through the central through hole 8 to the second mounting groove 7, and rotating the bolt 9 to enable the body and the rotating wheel to be fixedly connected through the bolt 9;

s3, placing the inner sealing cover 10 in the first mounting groove 6 and covering the bolt 9;

s4, air in a closed space formed by the inner sealing cover 10 and the inner side wall of the first mounting groove 6 in a surrounding manner is pumped away through the exhaust valve nozzle 11 on the inner sealing cover 10;

and S5, placing the outer sealing cover in the first mounting groove 6, and fixing and sealing the outer sealing cover and the notch of the first mounting groove 6.

When the outer sealing cover includes the thermal insulation layer 12 and the welding layer 13, step S5 includes the following steps:

s51, laying the heat insulation layer 12 on the inner sealing cover 10;

s52, placing solder above the heat insulation layer 12, wherein the solder covers the notch position of the first mounting groove 6;

and S53, heating the solder by a gas welding gun to soften the solder to form a welding layer 13, wherein the welding layer 13 seals the notch of the first mounting groove 6.

It should be noted that, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.

Claims

1. The utility model provides an installation method of wash-out cone, wash-out cone includes body, bolt (9), inside seal lid (10) and external seal lid, be equipped with connecting portion (2) on rear end face (1.2) of body, the central point of the preceding terminal surface of body is the indent and is formed first mounting groove (6), the central point of connecting portion (2) is the indent and is formed second mounting groove (7), be equipped with a central through-hole (8) between first mounting groove (6) and second mounting groove (7), its characterized in that: the method comprises the following steps:

s1, placing the body on the mounting position of the rotating wheel, wherein the second mounting groove (7) faces the rotating wheel;

s2, inserting a bolt (9) into the first mounting groove (6), enabling a screw rod of the bolt (9) to penetrate through the central through hole (8) to the second mounting groove (7), and rotating the bolt (9) to enable the body and the rotating wheel to be fixedly connected through the bolt (9);

s3, placing the inner sealing cover (10) in the first mounting groove (6) and covering the bolt (9);

s4, air in a closed space formed by the inner sealing cover (10) and the inner side wall of the first mounting groove (6) in a surrounding manner is pumped out through an exhaust valve nozzle (11) on the inner sealing cover (10);

s5, placing the outer sealing cover in the first mounting groove (6), and fixing and sealing the outer sealing cover and the notch of the first mounting groove (6);

the outer sealing cover comprises a heat insulation layer (12) and a welding layer (13), wherein the step S5 comprises the following steps:

s51, laying the heat insulation layer (12) on the inner sealing cover (10);

s52, placing solder above the heat insulation layer (12), wherein the solder covers the notch of the first mounting groove (6);

s53, heating the solder by a gas welding gun to soften the solder to form a welding layer (13), wherein the welding layer (13) seals the notch of the first mounting groove (6);

the body is provided with a front end face (1.1) and a rear end face (1.2), the cross section area of the front end face (1.1) is smaller than that of the rear end face (1.2), and the front end face (1.1) and the rear end face (1.2) are in transitional connection through a flow guide face (1.3);

a groove (3) is formed outside the connecting part (2) on the rear end face (1.2) of the body, a plurality of connecting pipes (4) are arranged in the body, one ends of the connecting pipes (4) are communicated with the groove (3), and the other ends of the connecting pipes (4) extend to penetrate through the flow guide face (1.3) along the length direction of the connecting pipes;

the grooves (3) extend along the circumferential direction of the connecting part (2) to form arc-shaped grooves (3), a plurality of grooves (3) are formed, and all the grooves (3) are arranged at intervals along the circumferential direction of the connecting part (2);

any two adjacent grooves (3) are communicated through a connecting groove (5), and the cross section area of the connecting groove (5) is smaller than that of each groove (3).