阅读说明：本技术 一种减弱水轮发电机组尾水管压力脉动的系统 (System for weakening pressure pulsation of draft tube of hydroelectric generating set ) 是由 陈晓云 李寒熠 邱方程 陆海 于 2019-11-15 设计创作，主要内容包括：本申请提供的一种减弱水轮发电机组尾水管压力脉动的系统,包括：转轮体、泄水锥、主轴、导流叶片控制装置及主轴中心补气装置,一方面,导流叶片控制装置可以根据水轮发电机组的运行工况,改变导流叶片的角度,使转轮流出的水流以较好的姿态流向尾水管,从而破坏尾水管涡带、减弱尾水管压力脉动；另一方面,通过补气阀、输气管道及补气孔将空气输送至转轮体的出口处,空气溶于转轮体出口处的水体中,增加转轮体出口处的压力,进而破坏转轮体出口处的低压状态,从而进一步破坏尾水管涡带、减弱尾水管压力脉动；因此导流叶片和补气装置二者相结合,从而有效的消除环流和减弱尾水管压力脉动,保证机组的稳定运行。(The application provides a weaken hydroelectric set draft tube pressure pulsation's system includes: the water flow flowing out of the runner flows to a tail water pipe in a better posture, so that a vortex belt of the tail water pipe is damaged, and pressure pulsation of the tail water pipe is weakened; on the other hand, air is conveyed to the outlet of the runner hub through the air replenishing valve, the air conveying pipeline and the air replenishing hole, and is dissolved in the water body at the outlet of the runner hub, so that the pressure at the outlet of the runner hub is increased, and further the low-pressure state at the outlet of the runner hub is damaged, thereby further damaging the vortex belt of the draft tube and weakening the pressure pulsation of the draft tube; therefore, the guide vane and the air supply device are combined, so that circulation flow is effectively eliminated, pressure pulsation of a draft tube is weakened, and stable operation of a unit is guaranteed.)

1. A system for attenuating pressure pulsation of a draft tube of a hydroelectric generating set, comprising: runner body (21), set up in runner body (21) lower extreme wash-out awl (4), set gradually in the main shaft of runner body (21) upper end, set up in guide vane controlling means in wash-out awl (4) and set up in main shaft center air supplement unit in the main shaft, wherein:

the main shaft includes: a water turbine shaft (8), a generator shaft (9) and an upper end shaft (10) which are connected in sequence;

the guide vane control device includes: guide vane bearing (3), guide vane controller (16), control scheme (15), control valve (14), guide vane (1), guide vane servomotor (19), guide vane control turning arm (20), first pressure oil pipe (12), second pressure oil pipe (18), pressure oil tank (13), wherein:

the guide vane (1) is arranged outside the water discharge cone (4) through the guide vane bearing (3);

the control valve (14) is arranged on the first pressure oil pipe (12), the first pressure oil pipe (12) is connected with the second pressure oil pipe (18) through a pipeline, and the second pressure oil pipe (18) is connected with the guide vane control crank arm (20) through the guide vane servomotor (19);

the main shaft center air supplement unit includes: first gas transmission pipeline (7), gulp valve (6), second gas transmission pipeline (5) and tonifying qi hole (2), wherein:

the first gas transmission pipeline (7) and the second gas transmission pipeline (5) are arranged in shafts of the water turbine shaft (8), the generator shaft (9) and the upper end shaft (10).

2. The system for attenuating draft tube pressure pulsation of a hydroelectric generating set according to claim 1 wherein said guide vane control means further comprises: a guide vane bearing mounting hole (17) arranged on the drainage cone (4),

the guide vane bearing (3) is arranged on the drain cone (4) through the guide vane bearing mounting hole (17).

3. The system for attenuating draft tube pressure pulsations of a hydroelectric generating set according to claim 1, wherein said first pressure conduit (12) is connected at one end to said second pressure conduit (18) and at the other end to said pressure tank (13).

4. The system for attenuating draft tube pressure pulsation of a hydroelectric generating set according to claim 1, wherein one end of the second pressure oil pipe (18) is connected to the first pressure oil pipe (12) and the other end thereof is connected to the guide vane servomotor (19).

5. The system for attenuating pressure pulsation of a draft tube of a hydroelectric generating set according to claim 1, wherein one end of the guide vane control crank arm (20) is connected to the inner surface of the guide vane bearing (3), and the other end thereof is connected to the guide vane servomotor (19).

6. System for attenuating pressure pulsations in the draft tube of a hydroelectric generating set according to claim 1, characterized in that said guide vane control (16) is connected to said control valve (14) by means of said control line (15).

7. The system for attenuating pressure pulsations of draft tubes of hydroelectric generating sets according to claim 1, wherein one end of the first gas transmission pipeline (7) is connected with the outside atmosphere and the other end is connected with the aeration valve (6).

8. The system for attenuating pressure pulsations of draft tubes of hydroelectric generating sets according to claim 1, wherein the second gas transmission pipeline (5) is connected with the aeration valve (6) at one end and with the aeration hole (2) at the other end.

9. The system for weakening pressure pulsation of a draft tube of a hydroelectric generating set according to claim 1, wherein an air supplement hole (2) is formed along the side wall of the drain cone (4).

10. A system for attenuating pressure pulsations in draft tubes of hydroelectric generating sets according to claim 1, wherein the water turbine shaft (8), the generator shaft (9) and the upper end shaft (10) are connected in series by means of bolts (11).

Technical Field

The application relates to the technical field of design optimization of hydroelectric generating sets, in particular to a system for weakening pressure pulsation of a draft tube of a hydroelectric generating set.

Background

The water turbine generator set is a device which converts the kinetic energy and the potential energy of water with a certain height of water head and flow into mechanical energy and finally into electric energy; the hydroelectric generating set comprises a hydraulic turbine, a hydraulic generator and hydraulic generating equipment consisting of auxiliary equipment of the hydraulic turbine, wherein the hydraulic turbine comprises a volute, a rotating wheel, a draft tube and the like, and the draft tube is used for guiding water leaving the rotating wheel to a downstream water outlet and utilizing partial energy of water flow at the outlet of the rotating wheel.

When the hydroelectric generating set operates under a partial working condition, the water flow in the tail water pipe generates low pressure due to large circulation, and an internal rotating vacuum vortex strip is formed in the tail water pipe, so that the vacuum vortex strip can cause unstable hydraulic force in a water turbine overflow channel, pressure pulsation occurs, the pressure pulsation can cause vibration of the generating set, power oscillation and low-frequency vibration of the wall of the tail water pipe, and the stable operation of the hydroelectric generating set is seriously influenced. Therefore, the pressure pulsation of the draft tube of the hydraulic turbine is a major factor affecting the stable operation of the hydraulic turbine.

At present, on one hand, the pressure pulsation of a tail water pipe of a water turbine generator set is weakened by conveying air to an outlet of a runner in a manner of air supplement at the center of a main shaft, so that the pressure pulsation of the tail water pipe of the water turbine generator set is weakened. On the other hand, the baffle is added to the straight conical section of the draft tube, or the guide plate is added to the elbow section of the draft tube to eliminate circulation or weaken vortex strips. However, because the water flow is complex to operate, the pressure pulsation state can be improved to a certain extent only by a single air supply mode; in addition, although the additional baffle or guide plate has certain effect, because it can not be fine and the operating condition of difference suits, can produce some adverse effect to the unit operation, for example reduce efficiency, change optimum operating condition etc..

Disclosure of Invention

The application provides a system for weakening pressure pulsation of a draft tube of a water turbine generator set, which aims to solve the technical problem of eliminating circulation and adapting to different working conditions.

In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:

the application provides a system for weakening hydroelectric set draft tube pressure pulsation includes: runner body, set up in runner body lower extreme wash-out awl, set gradually in the main shaft of runner body upper end, set up in guide vane controlling means in the wash-out awl and set up in main shaft center air supplement unit in the main shaft, wherein:

the main shaft includes: the water turbine shaft, the generator shaft and the upper end shaft are connected in sequence;

the guide vane control device includes: guide vane controller, control scheme, control valve, guide vane servomotor, guide vane control turning arm, first pressure oil pipe, second pressure oil pipe, pressure oil tank, wherein:

the control valve is arranged on the first pressure oil pipe, the first pressure oil pipe is connected with the second pressure oil pipe through a pipeline, and the second pressure oil pipe is connected with the guide vane control crank arm through the guide vane servomotor;

the main shaft center air supplement unit includes: first gas transmission pipeline, gulp valve, second gas transmission pipeline and gulp hole, wherein:

the first gas transmission pipeline and the second gas transmission pipeline are arranged in the shafts of the water turbine shaft, the generator shaft and the upper end shaft.

Optionally, the guide vane control device further includes: a guide vane bearing and a guide vane bearing mounting hole which are arranged on the drain cone,

the guide vane is arranged outside the water drain cone through the guide vane bearing;

the guide vane bearing is arranged on the water escape cone through the guide vane bearing mounting hole.

Optionally, one end of the first pressure oil pipe is connected to the second pressure oil pipe, and the other end of the first pressure oil pipe is connected to the pressure oil tank.

Optionally, one end of the second pressure oil pipe is connected to the first pressure oil pipe, and the other end of the second pressure oil pipe is connected to the guide vane servomotor.

Optionally, one end of the guide vane control crank arm is connected with the inner surface of the guide vane bearing, and the other end of the guide vane control crank arm is connected with the guide vane servomotor.

Optionally, the guide vane controller is connected to the control valve via the control line.

Optionally, one end of the first gas transmission pipeline is connected with the outside atmosphere, and the other end of the first gas transmission pipeline is connected with the gas supplementing valve.

Optionally, one end of the second gas transmission pipeline is connected with the gas supplementing valve, and the other end of the second gas transmission pipeline is connected with the gas supplementing hole.

Optionally, an air supply hole is formed along the side wall of the water discharge cone.

Optionally, the water turbine shaft, the generator shaft and the upper end shaft are connected in sequence through bolts.

Compared with the prior art, the beneficial effect of this application is:

according to the above technical scheme, the system that the application provided weakens hydroelectric set draft tube pressure pulsation includes: runner hub, sluicing awl, main shaft, guide vane controlling means and main shaft center air supplement unit, wherein:

(1) a guide vane control device: the guide vane controller sends a control signal for changing the angle of the guide vane to the control valve through the control line according to the collected guide vane opening degree signal, the control valve controls pressure oil in the pressure oil tank to be conveyed into a servomotor cylinder of the guide vane servomotor through the pressure oil pipe according to the received signal, a piston in the servomotor cylinder is pushed to move, and the guide vane connected with the servomotor piston is further pushed to control the crank arm to move, so that a guide vane bearing connected with the guide vane control crank arm is pushed to rotate, and the guide vane connected with the guide vane bearing rotates along with the rotation of the guide vane bearing, so that the angle of the guide vane is changed according to different guide vane opening degrees, and the optimal guide effect is achieved.

(2) Main shaft center air supplement unit: air is conveyed to the outlet of the runner body through the air supply valve, the air conveying pipeline and the air supply hole, and the air is dissolved in the water body at the outlet of the runner body, so that the pressure at the outlet of the runner body is increased, and further the low-pressure state at the outlet of the runner body is damaged, thereby further damaging a vortex belt of a draft tube and weakening the pressure pulsation of the draft tube.

In the present application: on one hand, the guide vane control device can change the angle of the guide vane according to the operation condition of the water turbine generator set, so that the tangential speed of the water flow flowing out of the runner vane is reduced, the water flow flowing out of the runner flows to the draft tube in a better posture, the vortex belt of the draft tube is damaged, and the pressure pulsation of the draft tube is weakened; on the other hand, air is conveyed to the outlet of the runner hub through the air replenishing valve, the air conveying pipeline and the air replenishing hole, and is dissolved in the water body at the outlet of the runner hub, so that the pressure at the outlet of the runner hub is increased, and further the low-pressure state at the outlet of the runner hub is damaged, thereby further damaging the vortex belt of the draft tube and weakening the pressure pulsation of the draft tube; therefore, the guide vanes and the air supply device are combined, so that the circulation flow is effectively eliminated, the pressure pulsation of the draft tube is weakened, the water flow flowing out of the rotating wheel flows to the draft tube in a better flow state, and the stable operation of the unit is ensured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a system for attenuating pressure pulsation of a draft tube of a hydro-turbo generator set according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a drainage cone of a system for weakening pressure pulsation of a draft tube of a hydroelectric generating set according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a guide vane control device of a system for weakening pressure pulsation of a draft tube of a water turbine generator set according to an embodiment of the present invention.

Wherein:

the method comprises the following steps of 1-guide vanes, 2-air supplement holes, 3-guide vane bearings, 4-water drain cones, 5-second air delivery pipelines, 6-air supplement valves, 7-first air delivery pipelines, 8-water turbine shafts, 9-generator shafts, 10-upper end shafts, 11-bolts, 12-first pressure oil pipes, 13-pressure oil tanks, 14-control valves, 15-control circuits, 16-guide vane controllers, 17-guide vane bearing mounting holes, 18-second pressure oil pipes, 19-guide vane servos, 20-guide vane control crank arms and 21-runner bodies.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram illustrating a system for attenuating pressure pulsation of a draft tube of a hydro-generator set according to an embodiment of the present invention. The following describes a system for weakening pressure pulsation of a draft tube of a hydroelectric generating set according to an embodiment of the present application with reference to fig. 1.

The application provides a system for weakening hydroelectric set draft tube pressure pulsation, as shown in fig. 1, include: runner body 21, set up in runner body 21 lower extreme sluicing awl 4, set up in proper order in the main shaft of runner body 21 upper end, set up in the guide vane controlling means in sluicing awl 4 and set up in the main shaft center air supplement unit in the main shaft, wherein:

fig. 2 is a schematic structural diagram of a drainage cone of a system for weakening pressure pulsation of a draft tube of a hydroelectric generating set according to an embodiment of the present invention; the system for weakening the pressure pulsation of the draft tube of the hydroelectric generating set provided by the embodiment of the application is described by combining the attached figure 2.

Fig. 3 is a schematic structural view of a guide vane control device of a system for weakening pressure pulsation of a draft tube of a hydroelectric generating set according to an embodiment of the present invention; as shown in fig. 3, the guide vane control device includes: a guide vane controller 16, a control circuit 15, a control valve 14, a guide vane 1, a guide vane servomotor 19, a guide vane control crank arm 20, a first pressure oil pipe 12, a second pressure oil pipe 18 and a pressure oil tank 13, wherein:

one end of the first pressure oil pipe 12 is connected with the second pressure oil pipe 18, and the other end is connected with the pressure oil tank 13.

One end of the second pressure oil pipe 18 is connected with the first pressure oil pipe 12, and the other end is connected with the guide vane servomotor 19.

One end of the guide vane control crank arm 20 is connected with the inner surface of the guide vane bearing 3, and the other end is connected with the guide vane servomotor 19.

The guide vane control 16 is connected to the control valve 14 via the control line 15.

The guide vanes 1 mainly guide the water flow flowing out of the runner to flow to the draft tube in a better flow state, and play a role in eliminating circulation and weakening pressure pulsation of the draft tube.

The control valve 14 is arranged on the first pressure oil pipe 12, the first pressure oil pipe 12 is connected with the second pressure oil pipe 18 through a pipeline, and the second pressure oil pipe 18 is connected with the guide vane control crank arm 20 through the guide vane servomotor 19.

Further, the guide vane control device further includes: a guide vane bearing 3 and a guide vane bearing mounting hole 17 which are arranged on the drain cone 4,

the guide vane 1 is arranged outside the water drain cone 4 through the guide vane bearing 3;

the guide vane bearing 3 is mounted on the drain cone 4 through the guide vane bearing mounting hole 17.

The guide vane bearing 3, the guide vane servomotor 19, the guide vane control crank arm 20, the pressure oil pipe, the pressure oil tank 13, the guide vane controller 16, the control circuit 15 and the control valve 14 form a guide vane control system, the guide vane control system is used for controlling the angle of the guide vane 1, and when the water-turbine generator set operates under different working conditions, the guide vane controller 16 pushes the guide vane 1 to be in the optimal guide angle through the guide vane bearing 3, the guide vane servomotor 19, the guide vane control crank arm 20, the pressure oil pipe, the pressure oil tank 13, the control circuit 15 and the control valve 14 according to the operation working conditions of the water-turbine generator set, so that circulation is effectively eliminated, pressure pulsation of a draft tube is weakened, and water flowing out of a runner flows to the draft tube in a better flow state.

Specifically, the guide vane controller 16 sends a control signal for changing the angle of the guide vane 1 to the control valve 14 through the control line 15 according to the collected guide vane opening signal, the control valve 14 controls the pressure oil in the pressure oil tank 13 to be conveyed into the servomotor cylinder of the guide vane servomotor 19 through the pressure oil pipe according to the received signal, the piston in the servomotor cylinder is pushed to move, the guide vane connected with the servomotor piston is further pushed to control the crank arm 20 to move, the guide vane bearing 3 connected with the guide vane control crank arm 20 is pushed to rotate, the guide vane connected with the guide vane bearing 3 rotates along with the rotation of the guide vane bearing 3, and therefore the angle of the guide vane is changed according to different guide vane openings to achieve the optimal guide effect.

The embodiment of the invention also comprises a main shaft center air supplementing device arranged in the main shaft, wherein: the main shaft includes: a water turbine shaft 8, a generator shaft 9 and an upper end shaft 10 which are connected in sequence; the water turbine shaft 8, the generator shaft 9 and the upper end shaft 10 are connected in sequence through bolts 11.

The main shaft center air supplement unit includes: the air supply device comprises a first air transmission pipeline 7, an air supply valve 6, a second air transmission pipeline 5 and an air supply hole 2, and specifically, the air supply hole 2 is formed along the side wall of the water escape cone 4.

Wherein:

the first gas transmission pipeline 7 and the second gas transmission pipeline 5 are arranged in the shafts of the water turbine shaft 8, the generator shaft 9 and the upper end shaft 10.

One end of the first gas transmission pipeline 7 is connected with the outside atmosphere, and the other end of the first gas transmission pipeline is connected with the gulp valve 6.

One end of the second gas transmission pipeline 5 is connected with the gas supplementing valve 6, and the other end of the second gas transmission pipeline is connected with the gas supplementing hole 2.

In the embodiment of the invention, the air supplementing hole 2, the first air transmission pipeline 7, the second air transmission pipeline 5 and the air supplementing valve 6 form a main shaft center air supplementing system of the water-turbine generator set, when the water-turbine generator set operates in a special working condition, the main shaft center air supplementing system conveys air to the outlet of the guide wheel through the air supplementing hole 2, the first air transmission pipeline 7, the second air transmission pipeline 5 and the air supplementing valve 6, the low-pressure state at the outlet of the guide wheel is damaged, and meanwhile, the guide vanes are matched to weaken the pressure pulsation of the tail water pipe, so that the stable operation of the water-turbine generator set is; specifically, air is conveyed to an outlet of the runner body through the air replenishing hole 2, the first air conveying pipeline 7, the second air conveying pipeline 5 and the air replenishing valve 6, the air is dissolved in a water body at the outlet of the runner body 21, the pressure at the outlet of the runner body 21 is increased, and then the low-pressure state at the outlet of the runner body 21 is damaged, so that the vortex belt of the draft tube is further damaged, and the pressure pulsation of the draft tube is weakened.

When the hydroelectric generating set operates under different working conditions, the guide vane controller can push the guide vanes to be in an optimal guide angle through the guide vane bearing, the guide vane servomotor, the guide vane control crank arm, the pressure oil pipe, the pressure oil tank, the control circuit and the control valve according to the operating working conditions of the hydroelectric generating set, meanwhile, the main shaft center air supply system conveys air to the outlet of the guide wheel through the air supply hole, the air conveying pipeline and the air supply valve to break the low-pressure state at the outlet of the guide wheel, and the guide vanes are combined with the main shaft center air supply system, so that circulation is effectively eliminated, pressure pulsation of a draft tube is weakened, water flowing out of the guide wheel flows to the draft tube in a better flow state, and stable operation of the hydroelectric generating set is ensured.

In conclusion, the device for weakening the pressure pulsation of the draft tube of the water-turbine generator set, provided by the invention, can change the angle of the guide vane according to the operation condition of the water-turbine generator set, so that the tangential speed of water flow flowing out of the runner vane is reduced, meanwhile, the air supplementing system at the center of the main shaft conveys air to the outlet of the guide runner through the air supplementing hole, the air conveying pipeline and the air supplementing valve, and the low-pressure state at the outlet of the runner is damaged, so that the vortex belt of the draft tube is damaged and the pressure pulsation of the draft tube is weakened.

Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.

It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

The above-described embodiments of the present application do not limit the scope of the present application.