CN216381686U

CN216381686U - Emergency treatment device for overhigh temperature of thrust bearing of vertical shaft mixed-flow hydraulic generator

Info

Publication number: CN216381686U
Application number: CN202122376604.4U
Authority: CN
Inventors: 闵占奎; 郑伟; 沈渭程; 王文欢; 刘秀良; 赵炜; 赵霖; 龚真尧; 潘丹露; 张赛; 魏润芝; 颜赟诚; 潘卫国; 王颢钧
Original assignee: STATE GRID GASU ELECTRIC POWER RESEARCH INSTITUTE; State Grid Gansu Electric Power Co Ltd; Shanghai Electric Power University
Current assignee: STATE GRID GASU ELECTRIC POWER RESEARCH INSTITUTE; State Grid Gansu Electric Power Co Ltd; Shanghai Electric Power University
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-04-26
Anticipated expiration: 2031-09-29

Abstract

The utility model discloses an emergency treatment device for overhigh temperature of a thrust bearing of a vertical shaft mixed-flow hydraulic generator, which is a method for reducing the total load of a bearing by automatically starting a water discharge valve on a top cover of a hydraulic turbine through an alarm signal when the temperature of the thrust bearing rises, so that the temperature of the thrust bearing is quickly and effectively reduced, a shutdown accident caused by the fact that the temperature of the thrust bearing exceeds a design limit is avoided, the generated energy is not lost, and the maintenance cost is also saved.

Description

Emergency treatment device for overhigh temperature of thrust bearing of vertical shaft mixed-flow hydraulic generator

Technical Field

The utility model belongs to the field of auxiliary devices of water turbines, and particularly relates to an emergency treatment device for overhigh temperature of a thrust bearing of a vertical shaft mixed-flow type hydraulic generator.

Background

The hydraulic generator is mainly composed of a rotor, a stator, a frame, a thrust bearing, a guide bearing, a cooler, a brake and other main components, wherein the thrust bearing is one of the most important components of the hydraulic generator set, and the thrust bearing has an operation failure, directly influences the safe and stable operation and economic benefit of the set and simultaneously influences the stable operation of a power grid. In recent years, hydroelectric generating sets are developed to giant generating sets, so that the size and the weight of the generating sets are large, the load of a thrust bearing is obviously increased, the working temperature of the thrust bearing is increased, and the safety risk is increased. The case that the damage was gone up to thrust bearing temperature in reality is more, not only influences the generating efficiency of hydroelectric generating set, influences the electric wire netting steady operation simultaneously, and thrust sliding bearing comprises thrust axle journal, thrust axle bush and bearing frame triplex, and the thrust axle bush is generally a plurality of.

At present, the method for solving the temperature rise of the thrust bearing has the first problem that the load is reduced and the power generation is less when the problem occurs, and the cost is the loss of benefit; secondly, the cooling capacity of the thrust bearing is improved, but the effect is limited; thirdly, shutdown maintenance treatment is carried out, so that the power generation benefit is lost, and the maintenance cost is increased; fourthly, the thrust bearing material with excellent performance and the structural form are adopted during design.

The thrust bearing load of the vertical shaft mixed-flow type water turbine generator set is composed of the weight of a rotor, the pressure difference of the front surface and the back surface of a runner blade, the pressure of a top cover cavity of the water turbine and the like, when the working water head of the water turbine changes, the output force is increased, the silt content of water flow is increased, and the abrasion of a labyrinth gap of the water turbine is increased, the internal pressure of the water turbine generator set is increased after excessive water permeates into the top cover cavity of the water turbine for a period of time, so that the load of the thrust bearing is increased, the working strength of the thrust bearing is increased, the temperature of the thrust bearing is increased, the safe operation of the bearing is threatened, the bearing is damaged when serious, and the machine set is forced to be shut down and overhauled. The larger the capacity of the unit is, the larger the diameter of the rotating wheel is, the larger the pressure of the top cover cavity is, namely, the larger the proportion of the pressure of the top cover cavity in the total load of the bearing is, the greater the threat to the safe operation of the thrust bearing is. If the temperature of the thrust bearing rises, the pressure of the top cover cavity of the water turbine is reduced, the load of the thrust bearing can be reduced, and the temperature of the thrust bearing can be reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: the emergency treatment device capable of solving the problem that the temperature of the thrust bearing of the hydraulic generator is too high is provided.

The technical scheme adopted by the utility model is as follows:

the utility model provides an excessive emergency treatment device of vertical scroll mixed flow hydraulic generator thrust bearing temperature, including vertical scroll mixed flow hydraulic generator body, the thrust bearing temperature signal that the thermoscope (21) that sets up on every thrust bearing (20) were drawn forth assembles temperature monitoring dish (27) in, the instruction that temperature monitoring dish (27) sent introduces drainage main valve controller (18), when thrust bearing temperature risees to sending alarm signal, valve controller starts to open drainage main valve (7) and carries out the drainage, reduce top cap intracavity pressure, and then reduce thrust bearing load, reduce the bearing temperature. The device is characterized in that drain branch pipes (4, 9, 13, 17) in symmetrical directions are arranged on a water turbine top cover (5) through flanges (2, 11, 12, 15). The water inlet end of each drainage branch pipe is connected to the top cover (5) through a flange and is communicated with the top cover cavity. The water outlet end of each drainage branch pipe is connected with a drainage ring pipe (25) through a drainage branch pipe three-way pipe (6), the drainage ring pipe is finally connected with a main drainage pipe (26) through a water outlet pipe three-way pipe (24), the outlet of the main drainage pipe (26) extends to tail water or a water collecting well, and an automatically controlled main drainage pipe electric valve (7) is installed on the main drainage pipe (26). The water turbine top cover is provided with symmetrical drainage branch pipes through flanges, and the number of the drainage pipes is increased or decreased according to the size of the runner.

According to the utility model, the number of the thermometers is consistent with that of the thrust bearing bushes, each thermometer corresponds to one thrust bearing bush, and the thermometers are connected with the thrust bearing bushes by virtue of the connecting structures; the pressure reducing assembly comprises a drainage header pipe and an electric valve, one end of each drainage branch pipe is connected with the top cover by virtue of a butt joint structure, the drainage header pipe is communicated with the space inside the top cover, the electric valve is connected at the other end of the drainage header pipe, the input end of the controller is connected with each thermometer, the output end of the controller is connected with the electric valve, the temperature of each thrust bearing bush is monitored by a plurality of thermometers respectively, once the temperature of the thrust bearing bush exceeds a set value, the electric valve is controlled to be opened by the controller, the water inside the top cover is discharged, the internal pressure of the top cover cavity can be reduced, thereby reducing the load of the thrust bearing, the temperature of the thrust bearing can be reduced, and the stable operation of the hydraulic turbine set is ensured.

Drawings

FIG. 1 is an elevational view of the emergency device of the present invention;

FIG. 2 is a top plan view of the emergency device of the present invention;

FIG. 3 is a schematic illustration of the emergency device main valve control according to the present invention;

reference numerals: 1-a main shaft flange, 2, 11, 12, 15-a top cover drainage branch pipe connecting flange, 3, 10, 14, 16-a manual valve, 4, 9, 13, 17-a top cover drainage branch pipe, 6-a drainage branch pipe three-way pipe, 5-a water turbine top cover, 7-a drainage main pipe electric valve, 8-a water turbine, 18-a valve controller, 19-a thrust bearing seat, 20-a thrust bearing, 21-a thrust bearing temperature measurer, 22-a thrust head, 23-a generator rotor, 24-a water outlet pipe three-way pipe, 25-a drainage ring pipe, 26-a drainage main pipe, 27-a bearing temperature monitoring disc and 28-a tail water pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

As shown in fig. 1-3.

The utility model provides an excessive emergency treatment device of vertical scroll mixed flow hydraulic generator thrust bearing temperature, including vertical scroll mixed flow hydraulic generator body, the thrust bearing temperature signal that the thermoscope (21) that set up on every thrust bearing (20) were drawn forth assembles temperature monitoring dish (27) in, the instruction that temperature monitoring dish (27) sent introduces drainage main valve controller (18), when thrust bearing temperature risees to sending alarm signal, valve controller starts to open drainage main electric valve (7) and carries out the drainage, reduce top cap intracavity pressure, and then reduce the thrust bearing load, reduce the bearing temperature.

(one) install the water drainage branch pipe 4 of direction of symmetry, 9, 13, 17 (if the runner size is big, can increase drain pipe quantity) on hydraulic turbine top cap 5 through the flange, the inlet end of each water drainage branch pipe passes through flange joint on top cap 5, and with top cap chamber UNICOM, the play water end of each water drainage branch pipe passes through three-way pipe 6 and is connected with drainage ring canal 25, the drainage ring canal is connected with main drainage pipe 26 through three-way pipe 24 at last, the main drainage pipe export extends to tail water or sump pit, main drainage pipe 26 is last to be installed automatic control's electric valve 7.

And (II) the temperature signals of the thrust bearings led out by the thermometers 21 on each thrust bearing 20 are converged into the temperature monitoring disc 27, the instruction sent by the temperature monitoring disc 27 is led into the main drainage valve controller 18, and when the temperature of the thrust bearing rises to send an alarm signal, the valve controller starts to open the main drainage valve 7 to drain water, so that the pressure in the cavity of the top cover is reduced, the load of the thrust bearing is further reduced, and the temperature of the bearing is reduced.

Thirdly, debugging the action of the emergency device, manually short-connecting the temperature of the emergency device controller 18 to open a contact, observing the normal action of the main drainage valve 7, and then inputting a temperature alarm action parameter of the thrust bearing into the emergency device controller 18;

and (IV) when the unit is in heavy load operation (the temperature of the thrust bearing reaches the highest at the moment), manually inputting a temperature alarm value of the thrust bearing, opening a drainage main valve to drain water, and observing the temperature reduction rule of the thrust bearing.

After the test is normal, if the temperature of the thrust bearing is abnormally increased to an alarm value in the normal power generation operation of the unit, the electric valve 7 of the top cover drainage main pipe automatically opens for drainage, the pressure of a top cover cavity (namely the load of the thrust bearing) is reduced, the temperature of the thrust bearing is reduced, the tile burning accident is avoided, and the safe operation of the unit is guaranteed.

Example two

The emergency treatment device for the overhigh temperature of the thrust bearing of the hydraulic generator comprises a top cover and the thrust bearing, wherein the thrust bearing comprises a plurality of thrust bearing bushes, and further comprises thermometers, pressure reduction assemblies and a controller, wherein the number of the thermometers is consistent with that of the thrust bearing bushes; the pressure reducing assembly comprises a drainage main pipe and an electric valve, one end of each drainage branch pipe is connected with the top cover through a butt joint structure, the drainage branch pipes are communicated with the space inside the top cover, the electric valve is connected to the other end of the drainage main pipe, the input end of the controller is connected with each thermometer, and the output end of the controller is connected with the electric valve.

When the temperature measuring device is used, the number of the thermometers is consistent with that of the thrust bearing bushes, each thermometer corresponds to one thrust bearing bush, and the thermometers are connected with the thrust bearing bushes through the connecting structures; the pressure reducing assembly comprises a drainage main pipe and an electric valve, one end of the drainage branch pipe is connected with the top cover by virtue of a butt joint structure, the drainage branch pipe is communicated with the space inside the top cover, the electric valve is connected to the other end of the drainage main pipe, the input end of a controller is connected with each thermometer, the output end of the controller is connected with the electric valve, the temperature of each thrust bearing bush is respectively monitored by a plurality of thermometers, once the temperature of the thrust bearing bush exceeds a set value, the electric valve is controlled to be opened by the controller to discharge water inside the top cover, the pressure inside the cavity of the top cover can be reduced, so that the load of a thrust bearing is reduced, the temperature of the thrust bearing bush can be reduced to ensure the stable operation of the hydraulic turbine set, the controller is based on a plc automatic control system and is provided with a plurality of input ends, each input end is respectively correspondingly connected with one thermometer, after the temperature of the thrust bearing bush is reduced, close electric valve again, can avoid the inside water of top cap to continuously discharge, because if the top cap is inside under the empty condition, can lead to the inside continuous infiltration of top cap, if the top cap is inside to have water then the infiltration condition is relatively more weak, consequently close electric valve after the thrust axle bush cooling and can avoid this kind of condition to take place, thrust axle bush temperature risees and needs the certain time, only need open electric valve so can when thrust axle bush temperature risees once more.

The connecting structure comprises a mounting hole formed in the thrust bearing bush, the thermometer is located in the mounting hole, connection between the thermometer and the thrust bearing bush is achieved, and the thermometer cannot influence the thrust bearing bush due to the fact that the thrust bearing bush is fixed.

The mounting hole is internally provided with internal threads.

The butt joint structure comprises a flange fixed at the end part of the drainage branch pipe, the flange is connected with the top cover through a bolt, the top cover is connected with the drainage branch pipe, and a through hole is formed in the position, corresponding to the drainage branch pipe, on the top cover. The pressure reducing assembly further comprises a drainage ring pipe and a plurality of drainage branch pipes, one end of each drainage branch pipe is connected with the top cover and communicated with the inside of the top cover, the other end of each drainage branch pipe is connected with the drainage ring pipe, the two ends of the drainage ring pipe are communicated with the drainage main pipe through a three-way pipe, the pressure in the cavity of the top cover can be reduced quickly, the inner diameter of the drainage main pipe is larger than the inner diameters of the drainage ring pipe and the drainage branch pipes, smooth drainage is guaranteed, and each drainage branch pipe is connected with a manual valve so as to be controlled respectively. The flange is fixed at one end of the drainage branch pipe connected with the top cover, the flange is connected with the top cover through a bolt, the drainage branch pipe is connected with the drainage ring pipe through a three-way pipe, the connection between the drainage branch pipe and the top cover and the connection between the drainage branch pipe and the drainage ring pipe are realized, and through holes are also formed in the position, corresponding to the drainage branch pipe, on the top cover.

The method for solving the problem of temperature rise of the thrust bearing at present is to reduce load and bearing load at the cost of reducing power generation benefit; secondly, the pressure and the flow of the cooling water of the thrust bearing are increased, but the effect is very general and sometimes the cooling water does not work; thirdly, shutdown maintenance treatment is carried out, so that the generated energy is lost, and the maintenance cost is increased; fourthly, thrust bearing materials with excellent performance and structural forms (only suitable for newly designed units) are adopted. The thrust bearing load of the vertical shaft mixed flow type water turbine generator set consists of the weight of a rotor, the pressure difference of the front and back surfaces of the runner blade, the pressure of a top cover cavity of the water turbine and the like. The hydraulic pressure of the top cover cavity of the water turbine is increased along with the increase of the load of the set, and the larger the capacity of the set is, the larger the diameter of the runner is, the larger the water pressure of the top cover cavity is, namely, the larger the proportion of the pressure of the top cover cavity in the total load of the bearing is, the larger the threat to the safe operation of the thrust bearing is. Accordingly, an obligee analyzes and summarizes an emergency treatment method for solving the problem of high temperature of the thrust bearing of the vertical shaft mixed-flow type water turbine generator set according to the reason of influencing the temperature rise of the thrust bearing of the hydropower station, namely, a water drain pipe is arranged on a top cover of the water turbine, an automatic valve which is controlled to be opened through the temperature value of the thrust bearing is arranged on the water drain pipe, when the temperature rise of the thrust bearing threatens safety, the temperature measurement signal of the thrust bearing starts a water drain pipe controller to automatically open the valve for draining, the bearing load is reduced, and further the bearing temperature is reduced. And closing or reducing the valve after the temperature of the bearing returns to normal. The method is simple and easy to use, low in manufacturing cost and obvious in effect, can quickly and effectively reduce the pressure of the top cover cavity (namely the total load of the bearing), reduces the temperature of the thrust bearing, and avoids the shutdown accident caused by the fact that the temperature of the thrust bearing exceeds the design limit.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, improvement and the like made within the content and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The utility model provides an excessive emergency treatment device of vertical scroll mixed flow hydraulic generator thrust bearing temperature, including vertical scroll mixed flow hydraulic generator body, a serial communication port, the thrust bearing temperature signal that the thermoscope (21) that sets up on every thrust bearing (20) were drawn forth assembles in temperature monitoring dish (27), the instruction that temperature monitoring dish (27) sent introduces drainage main valve controller (18), when the thrust bearing temperature rose to sending alarm signal, valve controller started and opened drainage main pipe electric valve (7) and drained water, reduce top cap intracavity pressure, and then reduce the thrust bearing load, reduce the bearing temperature.

2. The emergency treatment device for the overhigh temperature of the thrust bearing of the vertical shaft mixed flow type hydraulic generator is characterized in that the device is provided with symmetrical drainage branch pipes (4, 9, 13, 17) on a top cover (5) of the hydraulic turbine through flanges (2, 11, 12, 15).

3. The emergency treatment device for the overhigh temperature of the thrust bearing of the vertical shaft mixed-flow hydraulic generator as recited in claim 2, wherein the water inlet end of each water discharge branch pipe is connected to the top cover (5) through a flange and is communicated with the cavity of the top cover.

4. The emergency treatment device for the overhigh temperature of the thrust bearing of the vertical shaft mixed-flow hydraulic generator as claimed in claim 2, wherein the water outlet end of each drainage branch pipe is connected with a drainage ring pipe (25) through a drainage branch pipe three-way pipe (6), and the drainage ring pipe is finally connected with a drainage main pipe (26) through a water outlet pipe three-way pipe (24).

5. The emergency treatment device for the overhigh temperature of the thrust bearing of the vertical-shaft mixed-flow hydraulic generator according to claim 2, characterized in that the outlet of the drainage main pipe (26) extends to a tail water or a water collecting well, and the drainage main pipe (26) is provided with an automatically-controlled electric valve (7) of the drainage main pipe.

6. The emergency treatment device for the overhigh temperature of the thrust bearing of the vertical shaft mixed-flow hydraulic generator according to claim 2, wherein the number of the drainage pipes is increased or decreased according to the size of the runner by arranging the drainage branch pipes in the symmetrical direction on the top cover of the hydraulic generator through the flange.