CN114017445B - Thrust bearing cooling system and method for hydroelectric generating set - Google Patents
Thrust bearing cooling system and method for hydroelectric generating set Download PDFInfo
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- CN114017445B CN114017445B CN202111166149.3A CN202111166149A CN114017445B CN 114017445 B CN114017445 B CN 114017445B CN 202111166149 A CN202111166149 A CN 202111166149A CN 114017445 B CN114017445 B CN 114017445B
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- cooler
- oil
- stop valve
- cooling
- thrust bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/06—Bearing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C37/00—Cooling of bearings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Sliding-Contact Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention discloses a hydroelectric generating set thrust bearing cooling system and a method, comprising a cooling loop I and a plurality of cooling loops II; the cooling loop I comprises a mirror plate pump, an oil collecting groove, a first cooler oil inlet pipe, a first cooler and a first cooler oil outlet pipe; the cooling loop II comprises a second cooler oil inlet pipe, a second cooler and a second cooler oil outlet pipe; an oil collecting tank is arranged at the oil scraping plate and is communicated with an inlet of a second cooler through an oil inlet pipe of the second cooler, and an oil pump is arranged on the oil inlet pipe of the second cooler; the outlet of the second cooler is communicated with the outlet of the first cooler through the outlet of the second cooler. When the unit works, the cooling circuit I acts firstly, and the monitored oil temperature exceeds a set critical value along with the temperature rise of the tile mild lubricating oil, and the cooling circuit II also starts to work, so that the cooling efficiency is greatly submitted, and the reliability of the cooling lubricating oil is improved.
Description
Technical Field
The invention belongs to the technical field of hydroelectric generating set equipment, and particularly relates to a hydroelectric generating set thrust bearing cooling system and a hydroelectric generating set thrust bearing cooling method.
Background
The thrust bearing of the hydroelectric generating set is one of the most important parts of the hydroelectric generating set, bears axial loads such as the rotor mass, axial water thrust and the like of the generating set, and the working performance of the thrust bearing not only influences the output and the efficiency of the generating set, but also directly relates to whether the generating set can safely run or not. Under the complex working condition, the problem of high temperature of the thrust bearing bush easily occurs, and the occurrence of the jump or even the bush burning event occurs when the temperature of the thrust bearing bush is too high, so that the lubricating oil of the thrust bearing is required to be cooled and filtered, the bush temperature is reduced, and the working environment of the thrust bearing is improved.
Fig. 1 is a schematic diagram of a conventional thrust bearing cooling system for a hydro-generator set. The device comprises a mirror plate pump 1', an oil collecting tank 2', a seal 3', a filter 4', a temperature sensor 5', a pressure sensor, a pressure gauge 6', a cooler 7' and an oil injection pipe 8', wherein a thrust bearing cooling system is formed, the mirror plate pump 1' is formed by machining a plurality of radial holes through a bearing rotating part, when a unit is in operation, the outside of a rotating body is provided with the oil collecting tank 2', pumped oil is collected into a system oil pipe, and the pumped oil enters the cooler 7' for cooling after being detected by the temperature sensor 5' and the pressure sensor and the pressure gauge 6', and is sprayed near the oil inlet side of a tile after being cooled.
But this cooling system receives influence such as oil groove structure, lubricating oil viscosity at the during operation, and the cooling effect is not good enough, especially when the oil temperature is higher, and cooling efficiency is not high to lead to thrust bearing bush temperature to be higher, influenced the safe and stable operation of unit.
Disclosure of Invention
The invention aims to provide a thrust bearing cooling system and a thrust bearing cooling method for a hydroelectric generating set, which solve the technical problems that in the prior art, the bearing cooling system is affected by an oil groove structure, viscosity of lubricating oil and the like during working, the cooling effect is poor, and particularly when the oil temperature is high, the cooling efficiency is low, so that the temperature of a thrust bearing bush is high, and the safe and stable operation of the set is affected.
In order to solve the technical problems, the invention adopts the following technical scheme:
a thrust bearing cooling system of a hydroelectric generating set comprises a cooling loop I and a plurality of cooling loops II;
the cooling loop I comprises a mirror plate pump, an oil collecting groove, a first cooler oil inlet pipe, a first cooler and a first cooler oil outlet pipe, wherein the mirror plate pump is in sealing connection with the oil collecting groove, the oil collecting groove is communicated with an inlet of the first cooler through the first cooler oil inlet pipe, and an outlet of the first cooler is communicated with an oil injection pipe of the thrust bearing through the first cooler oil outlet pipe;
the cooling loop II comprises a second cooler oil inlet pipe, a second cooler and a second cooler oil outlet pipe; an oil collecting tank is arranged at the oil scraping plate and is communicated with an inlet of a second cooler through an oil inlet pipe of the second cooler, and an oil pump is arranged on the oil inlet pipe of the second cooler; the outlet of the second cooler is communicated with the outlet of the first cooler through the outlet of the second cooler.
According to the invention, by arranging the cooling loop I and the cooling loop II, when the unit is in various working conditions, a temperature critical value can be set according to the monitored temperature of the lubricating oil. When the unit works, the cooling circuit I acts firstly, and the monitored oil temperature exceeds a set critical value along with the temperature rise of the tile mild lubricating oil, the oil scraping plate starts to work, and the cooling circuit II also starts to work, so that the cooling efficiency is greatly submitted, and the reliability of the cooling lubricating oil is improved. When the unit works, the two cooling loops can be mutually standby, so that the unit can adapt to different working conditions.
Because the lubricating oil is easy to deteriorate under the action of high temperature and centrifugal force, a filter is added in a cooling loop to ensure the lubrication quality of the subsequent lubricating oil, thereby improving the lubrication quality.
Further preferably, a filter, a first temperature sensor and a first pressure sensor are arranged on the oil inlet pipe of the first oil cooler.
Further preferably, a second temperature sensor and a second pressure sensor are arranged on the oil inlet pipe of the second cooler.
Further optimized, the first cooler oil inlet pipe is communicated with the second cooler oil inlet pipe through an oil delivery pipe, a first stop valve is arranged on the oil delivery pipe, and a second stop valve is arranged on the second oil cooler oil outlet pipe; and a third stop valve is arranged on the oil inlet pipe of the first oil cooler, and the installation position of the third stop valve is positioned between the first cooler and the communication point between the oil inlet pipe of the first cooler and the oil delivery pipe.
Further optimizing, the filter is built-in with buckle arm-tie.
Further preferably, the first cooler oil outlet pipe is a circular pipe, and all the second cooler oil outlet pipes are communicated with the circular pipe.
And further optimizing, the ventilator is arranged in a foundation pit where a thrust bearing of the unit is positioned. The air in the foundation pit is exchanged with the air outside, so that the cooling effect is further improved.
Further preferably, the cooling loop I and the cooling loop II are both external circulation loops, and the first cooler and the second cooler are arranged outside the oil collecting groove. When the thrust bearing is overhauled, the cooler is not required to be disassembled while the thrust pad is disassembled, so that the overhauling is convenient.
According to the cooling method based on the thrust bearing cooling system of the hydroelectric generating set, the first stop valve, the second stop valve and the third stop valve are all electromagnetic valves, and the first temperature sensor, the first pressure sensor, the first cooler, the second temperature sensor, the second pressure sensor, the oil pump, the second cooler, the first stop valve, the second stop valve and the third stop valve are all electrically connected with the controller;
setting a temperature threshold in the controller; when the pumped storage unit starts to operate, the cooling loop I starts to operate, the cooling loop II does not operate, at the moment, the first stop valve and the second stop valve are both closed, and the stop valves are opened;
and when the oil temperature measured by a first temperature sensor on the cooling circuit I is higher than a threshold value, starting the oil scraping plate to start working, and starting the cooling circuit II to work, wherein the first stop valve, the second stop valve and the third stop valve are all opened.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by arranging the cooling loop I and the cooling loop II, when the unit is in various working conditions, a temperature critical value can be set according to the monitored temperature of the lubricating oil. When the unit works, the cooling circuit I acts firstly, and the monitored oil temperature exceeds a set critical value along with the temperature rise of the tile mild lubricating oil, the oil scraping plate starts to work, and the cooling circuit II also starts to work, so that the cooling efficiency is greatly submitted, and the reliability of the cooling lubricating oil is improved. When the unit works, the two cooling loops can be mutually standby, so that the unit can adapt to different working conditions.
Drawings
FIG. 1 is a schematic diagram of a prior art thrust bearing cooling system for a hydroelectric generating set;
FIG. 2 is a schematic diagram of a hydroelectric generating set thrust bearing cooling system according to the present invention;
FIG. 3 is a schematic top plan layout of a hydro-generator set thrust bearing cooling system of the present invention;
FIG. 4 is a graph of the results of numerical simulation of the thrust bearing oil film surface temperature; wherein, FIG. 4 (a) is a graph of the results of the numerical simulation of the surface temperature of the bearing oil film when only the cooling circuit I is in operation; FIG. 4 (b) is a graph showing the results of a numerical simulation of the surface temperature of the bearing oil film when cooling circuits I and II are operated together;
FIG. 5 is a graph of temperature versus radial for a pad of a thrust bearing in two cooling modes.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples.
Fig. 2 and 3 show a hydroelectric generating set thrust bearing cooling system, which comprises a cooling circuit I and six cooling circuits II.
The cooling circuit I comprises a mirror plate pump 1, an oil collecting groove 2, a first cooler oil inlet pipe, a first cooler 7 and a first cooler oil outlet pipe, wherein the mirror plate pump 1 in the cooling circuit I is formed by processing a plurality of radial holes by utilizing a bearing rotating part and is used for providing power for the cooling circuit I; the mirror plate pump 1 is connected with the oil collecting tank 2 through a sealing structure 3, and the oil collecting tank 3 is used for collecting hot oil; the oil collecting groove is communicated with an inlet of the first cooler 7 through a first cooler oil inlet pipe, and an outlet of the first cooler 7 is communicated with an oil injection pipe 8 of the thrust bearing through a first cooler oil outlet pipe; the first oil cooler oil inlet pipe is provided with a filter 4, a first temperature sensor 5 and a first pressure sensor 6, and the first cooler oil outlet pipe is a ring pipe.
The hot oil flows through the filter 4 according to the pipeline, and the filter adopts a built-in buckle pulling plate, so that the cleaning is convenient in time; the hot oil enters the first cooler 7 after being monitored by the first temperature sensor 5 and the first pressure sensor 6, is cooled by the first cooler 7 and is sprayed to the vicinity of the oil inlet side of the thrust bearing pad by the annular pipe and the oil spray pipe 8.
The cooling loop II comprises a second cooler oil inlet pipe, a second cooler 13 and a second cooler oil outlet pipe; an oil collecting tank is arranged at the oil scraping plate and is communicated with an inlet of a second cooler 13 through an oil inlet pipe of the second cooler, and an oil pump 12 is arranged on the oil inlet pipe of the second cooler; the outlet of the second cooler 13 is in communication with the first cooler outlet via a second cooler outlet. The second cooler oil inlet pipe is provided with a second temperature sensor 10 and a second pressure sensor 11. The first cooler oil inlet pipe is communicated with the second cooler oil inlet pipe through an oil delivery pipe, a first stop valve 14a is arranged on the oil delivery pipe, and a second stop valve 14b is arranged on the second oil cooler oil outlet pipe; the third stop valve 14c is arranged on the first oil cooler oil inlet pipe, and the installation position of the third stop valve 14c is positioned between the first cooler 7 and the communication point between the first cooler oil inlet pipe and the oil delivery pipe.
The oil collecting tank 9 is connected with the cooling loop II, and monitors the temperature of the hot oil through the second temperature sensor 10 and the second pressure sensor 11; the oil pump 12 provides power support for the cooling circuit II and is connected with the second cooler 13; the second cooler 13 cools the hot oil in the loop and then is sprayed to the vicinity of the oil inlet side of the tile by the annular pipe and the oil spray pipe 8.
When the rotating speed of the unit is high and the temperature of the tile is high, an oil scraping plate is arranged between two tiles to prevent hot oil from being carried to adjacent tiles. The device adopts a cooling loop II shared by every two oil scraping plates, and as shown in figure 3, 6 cooling loops II are arranged in the embodiment.
In the embodiment, the ventilator is installed in the foundation pit where the thrust bearing of the unit is located, and air in the foundation pit is intersected with outside air, so that the cooling effect is further improved.
In this embodiment, the cooling circuit i and the cooling circuit ii are both external circulation circuits, and the first cooler 7 and the second cooler 13 are installed outside the oil sump. When the thrust bearing is overhauled, the cooler is not required to be disassembled while the thrust pad is disassembled, so that the overhauling is convenient.
According to the cooling method based on the thrust bearing cooling device of the hydroelectric generating set, the first stop valve 14a, the second stop valve and the third stop valve 14c are all electromagnetic valves, and the first temperature sensor 5, the first pressure sensor 6, the first cooler 7, the second temperature sensor 10, the second pressure sensor 11, the oil pump 12, the second cooler 13, the first stop valve 14a, the second stop valve 14b and the third stop valve 14c are all electrically connected with the controller.
Setting a temperature threshold in the controller; when the pumped storage unit starts to operate, the cooling circuit I starts to operate, the cooling circuit II does not operate, at the moment, the first stop valve 14a and the second stop valve 14b are closed, and the stop valve 14c is opened;
with the increase of the operation time of the pumped storage unit, the thrust bearing pad of the unit and the oil temperature gradually rise, when the oil temperature measured by the first temperature sensor 5 on the cooling circuit I is higher than a threshold value, the oil scraping plate is started to start working, the cooling circuit II starts working, and at the moment, the first stop valve 14a, the second stop valve and the third stop valve 14c are all opened.
When the cooling equipment on the unit cooling circuit I needs to be overhauled or the cooling liquid is replaced, the cooling circuit II can also serve as a standby temporarily, namely the first stop valve 14a and the second stop valve 14b are opened simultaneously, the third stop valve 14c is closed, and the hot oil is cooled by the second cooler 14. Therefore, the cooling loop I and the cooling loop II can form independent cooling units, and simultaneously can meet the cooling requirements of the thrust bearing and the thrust tile thereof, thereby being beneficial to improving the operation stability and reliability of the hydroelectric generating set.
In order to verify the cooling effect of the cooling system, numerical simulation is performed on the oil film on the surface of the thrust bearing, and the temperature conditions of lubricating oil under the conditions that only the cooling circuit I works and the cooling circuit I and the cooling circuit II work together are obtained respectively. Dividing a calculation model into two parts of oil film and non-oil film areas through icem, wherein the oil film and non-oil film areas are divided by adopting structural grids in view of the small thickness of the former area, meanwhile, dividing the middle plane and the inclined surface areas on two sides of the oil film part into blocks, and connecting the connected parts of the blocks by adopting interfaces; the latter region is relatively simple in structure and large in thickness and is divided by unstructured grids, and interface connection is adopted at the junction of the unstructured grids and the oil film region. After the number independence test is carried out on the oil film and the non-oil film areas, the number of the oil film area grids is finally determined to be 20 ten thousand, and the number of the non-oil film area grids is finally determined to be 25 ten thousand; after grid division, the calculation model is simulated by utilizing FLUENT fluid analysis software, a pressure velocity coupling equation is solved by adopting a SIMPLEC method, and a second-order windward format difference is adopted for the convection term, turbulence energy and dissipation rate in the equation set. The boundary conditions of the lubricant inlet and the lubricant outlet which are respectively positioned on the inner side and the outer side of the model are respectively set as a velocity-inlet condition and an outflow condition, the mirror plate surface is set as a wall condition, and the left side and the right side of the model are set as periodic boundary conditions. FIG. 4 shows the results of a numerical simulation of the surface temperature of the oil film of a bearing when only the cooling circuit I is in operation, wherein FIG. 4a shows the results of a numerical simulation of the surface temperature of the oil film of a bearing when only the cooling circuit I is in operation; FIG. 4b is a graph showing the results of a numerical simulation of the surface temperature of the bearing oil film when cooling circuit I and cooling circuit II are operated together.
The temperature values of a certain pad of the thrust bearing along the radial direction measured in two cooling modes are shown in table 1 and the comparative graph is shown in fig. 5.
Table 1 temperature values of a pad of a thrust bearing in radial direction were measured in two cooling modes
It can be seen from fig. 4 and 5 that the oil cooling speed can be increased and the cooling efficiency can be improved when the cooling circuit i and the cooling circuit ii are operated together.
The above examples are given for clarity of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (8)
1. The thrust bearing cooling system of the hydroelectric generating set is characterized by comprising a cooling loop I and a plurality of cooling loops II;
the cooling loop I comprises a mirror plate pump, an oil collecting groove, a first cooler oil inlet pipe, a first cooler and a first cooler oil outlet pipe, wherein the mirror plate pump is in sealing connection with the oil collecting groove, the oil collecting groove is communicated with an inlet of the first cooler through the first cooler oil inlet pipe, and an outlet of the first cooler is communicated with an oil injection pipe of the thrust bearing through the first cooler oil outlet pipe;
the cooling loop II comprises a second cooler oil inlet pipe, a second cooler and a second cooler oil outlet pipe; an oil scraping plate is arranged between the tiles of the thrust bearing of the hydroelectric generating set, an oil collecting tank is arranged at the oil scraping plate, the oil collecting tank is communicated with an inlet of the second cooler through an oil inlet pipe of the second cooler, and an oil pump is arranged on the oil inlet pipe of the second cooler; the outlet of the second cooler is communicated with the outlet of the first cooler through the outlet of the second cooler;
the oil inlet pipe of the first cooler is communicated with the oil inlet pipe of the second cooler through an oil conveying pipe, a first stop valve is arranged on the oil conveying pipe, and a second stop valve is arranged on the oil outlet pipe of the second cooler; and a third stop valve is arranged on the oil inlet pipe of the first cooler, and the installation position of the third stop valve is positioned between the first cooler and the communication point between the oil inlet pipe of the first cooler and the oil delivery pipe.
2. The hydro-generator set thrust bearing cooling system of claim 1, wherein the first cooler oil inlet tube is provided with a filter, a first temperature sensor, and a first pressure sensor.
3. The hydro-generator set thrust bearing cooling system of claim 2, wherein the second cooler oil inlet tube is provided with a second temperature sensor and a second pressure sensor.
4. The hydro-generator set thrust bearing cooling system of claim 3, wherein the filter incorporates snap-fit tie plates.
5. The hydro-generator set thrust bearing cooling system of claim 1, wherein the first cooler oil outlet is a collar and all second cooler oil outlets are in communication with the collar.
6. The hydroelectric generating set thrust bearing cooling system of claim 1, further comprising a ventilator mounted in a pit in which the set thrust bearing is located.
7. The hydro-generator set thrust bearing cooling system of claim 1, wherein the cooling circuit i and the cooling circuit ii are both external circulation circuits, and the first cooler and the second cooler are mounted outside the oil sump.
8. The cooling method based on the thrust bearing cooling system of the hydroelectric generating set according to any one of claims 3 to 7, wherein the first stop valve, the second stop valve and the third stop valve are all electromagnetic valves, and the first temperature sensor, the first pressure sensor, the first cooler, the second temperature sensor, the second pressure sensor, the oil pump, the second cooler, the first stop valve, the second stop valve and the third stop valve are all electrically connected with the controller;
setting a temperature threshold in the controller; when the pumped storage unit starts to operate, the cooling circuit I starts to operate, the cooling circuit II does not operate, at the moment, the first stop valve and the second stop valve are closed, and the third stop valve is opened;
and when the oil temperature measured by a first temperature sensor on the cooling circuit I is higher than a threshold value, starting the oil scraping plate to start working, and starting the cooling circuit II to work, wherein the first stop valve, the second stop valve and the third stop valve are all opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111166149.3A CN114017445B (en) | 2021-09-30 | 2021-09-30 | Thrust bearing cooling system and method for hydroelectric generating set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111166149.3A CN114017445B (en) | 2021-09-30 | 2021-09-30 | Thrust bearing cooling system and method for hydroelectric generating set |
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| CN114017445A CN114017445A (en) | 2022-02-08 |
| CN114017445B true CN114017445B (en) | 2023-09-29 |
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| CN114017445A (en) | 2022-02-08 |
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