CN109386421B

CN109386421B - Water drainage cone

Info

Publication number: CN109386421B
Application number: CN201811206703.4A
Authority: CN
Inventors: 周新; 李晓梅
Original assignee: JIANGXI LIANHUA HYDRAULIC TURBINE PLANT
Current assignee: JIANGXI LIANHUA HYDRAULIC TURBINE PLANT
Priority date: 2018-10-17
Filing date: 2018-10-17
Publication date: 2020-03-27
Anticipated expiration: 2038-10-17
Also published as: CN109386421A

Abstract

The invention discloses a water drainage cone which comprises a body, wherein the front end face and the rear end face are in transitional connection through a flow guide face, the central position of the rear end face of the body is outwards protruded along the axial direction to form a connecting part, external threads are arranged on the outer side wall of the connecting part, a groove is arranged 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, the other ends of the connecting pipes extend to penetrate through the flow guide face along the length direction, the middle parts of the connecting pipes are bent along the horizontal direction to form bent parts, and water flow in the connecting pipes acts on the bent parts to enable the rotating direction of the body to be the. The invention provides a drainage cone which can reduce the pressure in a gap between a rotating wheel and a volute in a drainage mode so as to reduce the rotating resistance of the rotating wheel and is not easy to loosen.

Description

Water drainage cone

Technical Field

The invention relates to the technical field of water turbines, in particular to a water discharge 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.

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 a sluicing 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, sluicing awl is difficult for the pine to take off moreover, and sound construction is reliable.

Therefore, one object of the invention is to provide a water drainage cone, which comprises a body, wherein the cross section area of the front end surface of the body is smaller than that of the rear end surface of the body, the front end surface and the rear end surface are in transitional connection through a flow guide surface, the central position of the rear end surface of the body is protruded outwards along the axial direction to form a connecting part, external threads are arranged on the outer side wall of the connecting part, a groove is arranged outside the connecting part on the rear end surface of the body, a plurality of connecting pipes are arranged in the body, one ends of the connecting pipes are communicated with the groove, the other ends of the connecting pipes extend to penetrate through the flow guide surface along the length direction of the connecting pipes, the middle parts of the connecting pipes are bent along the horizontal direction to form bent parts, and water flow in the connecting. Through setting up the recess can make between wash-out awl and the runner screw up the in-process make connecting pipe and drain pipe communicate all the time. And through the design of the bending part, the water flow in the connecting pipe drives the drain cone to be stressed along the circumferential direction in the flowing pressure relief process, and the acting force drives the drain cone to be screwed with the rotating wheel, so that the situation that the drain cone loosens after being used for a long time is eliminated.

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 can be in one-to-one correspondence with the respective water inlet sources, so that the difference of the water outlet pressure in different connecting pipes can achieve the balance of stress by utilizing 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.

According to an example of the invention, a central hole is formed in the body, the central hole penetrates through the connecting part along the axial direction, an annular blocking piece is arranged in the central hole, and the outer edge of the blocking piece is fixedly connected with the inner wall of the central hole.

According to an example of the present invention, the intermediate portion of the connection pipe is bent in a circumferential direction of the connection portion to form a bent portion.

According to an example of the invention, an annular vibration cavity is arranged in the body, a movable vibration ball is arranged in the vibration cavity, a vibration convex edge matched with the vibration ball is arranged on the inner side wall of the vibration cavity, when the vibration ball moves along the length direction of the vibration cavity, the vibration ball collides with the vibration convex edge to vibrate the body, a liquid inlet branch pipe and a liquid outlet branch pipe which are respectively communicated with the vibration cavity are arranged in the body, the liquid inlet branch pipe is communicated with a groove or a connecting pipe, and one end, far away from the groove, of the liquid outlet branch pipe penetrates through the flow guide surface. Thereby be favorable to fixing between body and the runner through the vibrations effect from the area to can reduce the static friction between body and the runner through vibrations, be favorable to the fastening of body and runner.

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, consequently can be with the ponding pressure release in the runner on the hydraulic turbine through set up the connecting pipe on the sluicing awl, reach the effect that reduces pressure, and the design through the recess can make the sluicing awl can communicate with the source of intaking all the time through the recess at the in-process connecting pipe that the rotation was screwed up, promptly with the pipeline intercommunication on the runner, secondly, the bending design of connecting pipe can make the sluicing awl possess from the effect of pretension, reduce even avoided the condition that the sluicing awl pine takes off.

Drawings

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

Fig. 2 is a schematic view of the internal structure of the wash-out cone of the present invention.

FIG. 3 is a schematic bottom view of the weep cone of the present invention.

FIG. 4 is a schematic bottom view of another configuration of the bleed cone of the present invention.

Wherein, 1, body, 1.1 preceding terminal surface, 1.2, rear end face, 1.3, water conservancy diversion face, 2, connecting portion, 3, recess, 4, connecting pipe, 4.1, kink, 5, spread groove, 6, centre bore, 7, separation blade, 8, vibrations chamber, 9, vibrations ball, 10, vibrations chimb.

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 hydraulic 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 1 shown in figure 1, wherein the cross section area of a front end surface 1.1 of the body 1 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 1 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 1, a plurality of connecting pipes 4 are arranged in the body 1, one ends of the connecting pipes 4 are communicated with the groove 3, the other ends of the connecting pipes 4 extend to penetrate through the flow guide surface 1.3 along the length direction, the middle parts of the connecting pipes 4 are bent along the horizontal direction to form bent parts 4.1, and water flow in the connecting pipes 4 acts on the bent parts 4.1 to enable the rotating direction of the body 1 to be the same as the rotating direction of. That is, the position of the bent portion 4.1 of the water flow in the connecting pipe 4 is changed in direction, so that a pushing force is generated on the bent portion 4.1, and the pushing force is transmitted to the body 1, so that the body 1 is subjected to the pushing force to generate a circumferential rotation acting force, when the direction of the acting force is the same as the direction when the body 1 is screwed, the pushing force can drive the body 1 to rotate towards the screwing direction, that is, when the external thread is designed to be a forward rotation, the direction of the acting force of the bent portion 4.1 on the body 1 is a clockwise direction, and when the external thread is designed to be a reverse rotation, the direction of the acting force of the bent portion 4.1 on the body 1 is a counterclockwise direction. The core of the design of the bending part 4.1 lies in that the body 1 is driven by the impact force of water flow to be fastened on the rotating wheel, so that the risk of loosening the drain cone on the rotating wheel after the water turbine is used for a long time is avoided.

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. 4 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 the design is to enable a single pipeline on a runner of the water turbine to correspond to one groove 3 on the water drain cone so as to correspond to respective connecting pipes 4, and the plurality of connecting pipes 4 are not designed in parallel in the runner, so that the overall force balance of the runner is adjusted by means of different water pressures in different connecting pipes 4 through the staggered distribution of the connecting pipes 4 and the design of the angle between the water flow injection direction of the water outlet end of the connecting pipes 4 and the horizontal plane

Example five:

the basic mechanism is the same as the first embodiment, and the difference is that: the body 1 is internally provided with a central hole 6, the central hole 6 axially penetrates through the connecting part 2, an annular baffle 7 is arranged in the central hole 6, and the outer edge of the baffle 7 is fixedly connected with the inner wall of the central hole 6.

Example six:

the basic mechanism is the same as the first embodiment, and the difference is that: the middle part of the connecting pipe 4 is bent along the circumferential direction of the connecting part 2 to form a bent part 4.1.

Example seven:

the basic mechanism is the same as the first embodiment, and the difference is that: be equipped with annular vibrations chamber 8 in this body 1, be equipped with the vibrations ball 9 of a activity in the vibrations chamber 8, be equipped with on the inside wall in vibrations chamber 8 with vibrations ball 9 matched with vibrations chimb 10, when vibrations ball 9 removed along the length direction in vibrations chamber 8 vibrations ball 9 collides with vibrations chimb 10 so that this body 1 vibrations, this body 1 is equipped with respectively with the feed liquor branch pipe and the flowing back branch pipe in vibrations chamber 8 intercommunication, feed liquor branch pipe and recess 3 or connecting pipe 4 intercommunication, the one end that recess 3 was kept away from to the flowing back branch pipe runs through water conservancy diversion face 1.3. In the prior art, in order to avoid the release of the drain cone, the vibration of the drain cone should be avoided as much as possible, so that the external thread outside the upper connecting part of the drain cone and the internal thread in the mounting hole of the runner can be screwed tightly. However, in the application of the present invention, since the bending portion 4.1 is additionally provided, the drain cone and the runner can be driven to be fastened by the circumferential acting force of the water flow by means of the vibration ball 9, so that the static friction force between the external thread and the internal thread on the runner is reduced by the vibration of the vibration ball 9, which is beneficial to fastening the drain cone and the runner.

Preferably, the liquid inlet branch pipe and/or the liquid discharge branch pipe can be valves, and the starting and stopping of the vibration ball are realized by opening and closing the valves. The valve can be a manual mechanical valve or an electromagnetic control electromagnetic valve.

The use process of the water drain device can be that the water drain cone is screwed on the rotating wheel, the valve is opened after the water turbine is opened, the valve is closed after the water turbine operates for a period of time, and the process is repeated when the next maintenance process is carried out. Namely, the drain cone is fastened with the rotating wheel by opening the valve after the maintenance is finished each time. Of course, the valve can be automatically opened and closed periodically by using the electromagnetic valve. The start-stop valve in the process reduces the influence of long-term continuous vibration on the rotating wheel in the daily use 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.

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. A wash-out cone, its characterized in that: including body (1), the cross sectional area of preceding terminal surface (1.1) of body (1) is less than the cross sectional area of rear end face (1.2), through water conservancy diversion face (1.3) transitional coupling between preceding terminal surface (1.1) and the rear end face (1.2), the central point of rear end face (1.2) of body (1) puts along the outer convex one-tenth connecting portion (2) of axial, is equipped with the external screw thread on the lateral wall of connecting portion (2), lie in connecting portion (2) peripheral hardware recess (3) on rear end face (1.2) of body (1), be equipped with a plurality of connecting pipes (4) in body (1), the one end and the recess (3) intercommunication of connecting pipe (4), the other end of connecting pipe (4) extends to running through water conservancy diversion face (1.3) along self length direction, the mid portion of connecting pipe (4) is bent along the horizontal direction and is formed kink (4.1), the interior rivers of connecting pipe (4) act on kink (4.1) so that make body (1) pivoted direction and body (1) go up The external threads of the connecting part (2) have the same rotating direction.

2. A wash cone according to claim 1, wherein: the groove (3) extends along the circumferential direction of the connecting part (2) to form an annular groove.

3. A wash cone according to claim 1, wherein: be equipped with annular vibrations chamber (8) in body (1), be equipped with vibrations ball (9) of a activity in vibrations chamber (8), be equipped with on the inside wall in vibrations chamber (8) with vibrations ball (9) matched with vibrations chimb (10), when vibrations ball (9) remove along the length direction in vibrations chamber (8) vibrations ball (9) collide with vibrations chimb (10) so that body (1) vibrations, be equipped with the feed liquor branch pipe and the flowing back branch pipe that communicate with vibrations chamber (8) respectively in body (1), feed liquor branch pipe and recess (3) or connecting pipe (4) intercommunication, the one end that recess (3) were kept away from to the flowing back branch pipe runs through water conservancy diversion face (1.3).