Water turbine thrust bearing oil film adjusting device and method thereof
Through the pressure sensor and intelligent oil pump system, the oil film thickness of the turbine thrust bearing is monitored and adjusted in real time, which solves the problem that traditional adjustment methods are difficult to adapt to complex environments, and achieves efficient operation and long life of the equipment.
Patent Information
- Application Number
- CN202411542523.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-01-03
AI Technical Summary
The oil film load-bearing strength adjustment of traditional turbine thrust bearings is difficult to monitor and control in real time, and cannot adapt to complex operating environments, resulting in abnormal wear and high maintenance costs of the equipment.
The pressure sensor and intelligent high-voltage output, input oil pump and electronic control unit are used to monitor the oil film bearing strength data in real time through wireless connection, and automatically adjust the oil film thickness to ensure that it is within the preset range.
It achieves the optimal lubrication and load-bearing state of thrust bearings under various operating conditions, extends service life, improves equipment efficiency and reduces failure rate.
Smart Images
Figure CN119244424A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a turbine thrust bearing oil film regulating device and a method thereof, belonging to the technical field of hydropower generation equipment. Background Art
[0002] As an important hydropower equipment, the thrust bearing of the turbine is mainly used to bear the axial force generated by the turbine rotor. Since the turbine generates a large amount of axial thrust during operation, the thrust bearing must be able to withstand this huge load, otherwise it will affect the normal operation of the turbine. The normal operation of the thrust bearing usually relies on reducing friction and wear through oil film lubrication. The oil film forms a thin liquid lubrication layer between the thrust bearing and the bearing seat, which can play a role in shock absorption, cooling and reducing friction when the bearing is under load. The oil film load-bearing strength adjustment of the thrust bearing has an important impact on its operating stability and energy efficiency. In order to ensure the working performance of the thrust bearing, the thickness and load-bearing strength of the oil film need to be kept within an appropriate range. If the oil film is too thin, it may cause the bearing to overheat or wear; if the oil film is too thick, it may affect the efficiency of the equipment. Therefore, it is very critical to reasonably control the load-bearing strength of the oil film.
[0003] In the design of traditional turbine thrust bearings, the adjustment of the oil film's load-bearing strength usually relies on fixed oil circuit design and manual adjustment. This method may have problems such as response lag, difficulty in precise control, and inability to monitor and adjust in real time during actual operation. In addition, as the operating conditions of the turbine change, the state of the oil film will also change. The fixed adjustment method cannot adapt to the complex operating environment and is prone to abnormal wear and failure of the equipment. The existing technology has high maintenance costs, and some devices require frequent maintenance and adjustment, which increases maintenance costs and downtime.
[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgement or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention
[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a turbine thrust bearing oil film regulating device and method thereof, so as to ensure that the thrust bearing can maintain optimal lubrication and load-bearing state under various operating conditions, which is beneficial to prolonging the service life of the thrust bearing, improving the overall operating efficiency of the equipment, and reducing the failure rate.
[0006] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a turbine thrust bearing oil film regulating device, comprising a thrust bearing, a pressure sensor, an oil storage tank, and an electronic control unit for controlling an intelligent high-pressure output oil pump and an intelligent high-pressure input oil pump; The thrust bearing comprises bearing shells which are arranged on the base at equal intervals; a groove is provided at the bottom of the front end surface of each bearing shell; an output oil hole is provided on the top surface of the bearing shell, and an input oil hole is provided on the front end surface; an oil pipeline is provided inside the bearing shell; two ends of the oil pipeline are respectively connected with the output oil hole and the input oil hole; a first oil pipe is arranged in the groove; the input oil hole is connected with the first oil pipe through a capillary pipe; the pressure sensor is arranged between the base and the bearing shell, and is used to monitor the oil film bearing strength data of the oil film formed on the top surface of the bearing shell; The first oil pipe is connected to the intelligent high-pressure output oil pump through the output oil pipe; the first oil pipe is connected to the intelligent high-pressure input oil pump through the input oil pipe; the intelligent high-pressure output oil pump and the intelligent high-pressure input oil pump are respectively connected to the oil storage tank; the output oil pipe and the input oil pipe are respectively provided with check valves; the pressure sensor is wirelessly connected to the electronic control unit.
[0007] Furthermore, the check valve is a diaphragm check valve.
[0008] Furthermore, the output oil pipe and the input oil pipe are respectively connected to the first oil pipe through the second oil pipe.
[0009] Furthermore, the diameter of the second oil pipe is the same as the diameter of the first oil pipe; the diameters of the output oil pipe and the input oil pipe are both larger than the diameter of the second oil pipe.
[0010] Furthermore, the first oil pipe, the output oil pipe, the input oil pipe and the second oil pipe are all made of rubber.
[0011] Furthermore, the bearing bush is made of stainless steel.
[0012] In a second aspect, the present invention provides a method for regulating oil film of a hydraulic turbine thrust bearing, comprising: Using a pressure sensor to monitor actual oil film bearing strength data of the oil film formed on the top surface of the bearing bush, and transmitting the data to the electronic control unit via radio; Judging the actual oil film bearing strength data according to a preset oil film bearing strength data range of the electronic control unit; When the actual oil film strength data is less than the preset oil film strength data range, the electronic control unit controls the intelligent high-pressure output oil pump to be turned off and the intelligent high-pressure input oil pump to be turned on, so that the oil flows out to the output oil hole through the oil storage tank, the intelligent high-pressure input oil pump, the input oil pipe, the first oil pipe, the capillary pipe, the input oil hole and the oil pipeline in sequence until the actual oil film strength data monitored by the pressure sensor is within the preset oil film strength data range, and then the intelligent high-pressure input oil pump is turned off; When the actual oil film bearing strength data is greater than the preset oil film bearing strength data range, the electronic control unit controls the intelligent high-pressure input oil pump to close and turns on the intelligent high-pressure output oil pump, so that the oil flows out to the output oil pipe through the output oil hole, the oil pipeline, the input oil hole, the capillary pipe and the first oil pipe in sequence, and enters the oil storage tank through the intelligent high-pressure output oil pump until the actual oil film bearing strength data monitored by the pressure sensor is within the preset oil film bearing strength data range, and then the intelligent high-pressure output oil pump is turned off.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a turbine thrust bearing oil film regulating device, wherein a connected output oil hole, an oil pipeline and an input oil hole are provided on the bearing shell of the thrust bearing, and the input oil hole is connected to the first oil pipe through a capillary pipe. The electronic control unit controls the intelligent high-pressure output oil pump and the intelligent high-pressure input oil pump to output or input the oil used for lubrication into the first oil pipe through the corresponding output oil pipe and the input oil pipe, and enter and exit the output oil hole, the oil pipeline and the input oil hole on the bearing shell through the capillary pipe, so as to flexibly adjust the thickness of the oil film formed on the top surface of the bearing shell, and at the same time, the oil film bearing strength data of the oil film formed on the top surface of the bearing shell is monitored in real time by the pressure sensor and sent to the electronic control unit, and the electronic unit adjusts the bearing shell of the intelligent high-pressure output oil pump and the intelligent high-pressure input oil pump to ensure that the thickness of the oil film formed on the top surface of the bearing shell meets the preset oil film bearing strength data range, thereby ensuring that the thrust bearing can maintain the best lubrication and load-bearing state under various operating conditions, which is beneficial to prolonging the service life of the thrust bearing, improving the overall operating efficiency of the equipment, and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of a turbine thrust bearing oil film regulating device provided by the present invention; Figure 2 yes Figure 1 Schematic diagram of the oil circuit structure of the thrust bearing; Figure 3 yes Figure 1 Schematic diagram of the structure of the middle bearing; Figure 4 yes Figure 1 Detailed connection diagram of each oil circuit of the center bearing; Figure 5 It is a flow chart of a method for regulating oil film of a hydraulic turbine thrust bearing; In the figure: 1. thrust bearing; 2. pressure sensor; 3. oil storage tank; 4. intelligent high-pressure output oil pump; 5. intelligent high-pressure input oil pump; 6. bearing; 7. base; 8. slot; 9. output oil hole; 10. input oil hole; 11. first oil pipe; 12. capillary pipe; 13. output oil pipe; 14. input oil pipe; 15. check valve; 16. second oil pipe; 17. micro oil port; 18. upper frame; 19. stator; 20. coupling; 21. impeller; 22. oil film. DETAILED DESCRIPTION
[0015] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.
[0016] like Figure 1 The actual turbine includes an upper frame 18, a stator 19, a thrust bearing 1, a coupling 20 and a runner 21. The stator 19 is arranged above the thrust bearing 1, and the coupling 20 is arranged below. The upper frame 18 is installed above the stator 19, and the bottom of the coupling 20 is connected to the runner 21. Example
[0017] See also Figures 1 to 4 , combined with Figure 1 The present embodiment of the above-mentioned turbine further provides a turbine thrust bearing 1 oil film 22 regulating device, including a thrust bearing 1, a pressure sensor 2, an oil storage tank 3, an intelligent high-pressure output oil pump 4, an intelligent high-pressure input oil pump 5 and an electronic control unit. The electronic control unit is connected to the intelligent high-pressure output oil pump 4 and the intelligent high-pressure input oil pump 5 respectively to control the intelligent high-pressure output oil pump 4 and the intelligent high-pressure input oil pump 5.
[0018] like Figure 2 , Figure 3 and Figure 4 The thrust bearing 1 includes a base 7 and a bearing shell 6. A plurality of bearing shells 6 are arranged on the base 7 at equal intervals. A slot 8 is provided at the bottom of the front end surface of each bearing shell 6, an output oil hole 9 is provided on the top surface of the bearing shell 6, and an input oil hole 10 is provided on the front end surface of the bearing shell 6. In some embodiments, the output oil hole 9 and the input oil hole 10 respectively include a plurality of 0.01m oil ports 17, and the lubricating oil can penetrate each other through the micro oil holes 17, so that the oil film 22 on the top surface of the bearing shell 6 can quickly form a certain thickness and improve the effect of forming the oil film.
[0019] An oil pipeline is provided inside the bearing 6, and the two ends of the oil pipeline are connected to the output oil hole 9 and the input oil hole 10 respectively. The oil pipeline is a fine oil pipeline, and the diameter of the oil pipeline is 0.0001m. The first oil pipe 11 is arranged in the slots 8 of multiple bearings 6 to form a closed pipeline. In some embodiments, the diameter of the slot 8 is 0.085m, and the maximum diameter of the first oil pipe 11 is 0.085m. Each input oil hole 10 is connected to the first oil pipe 11 through a corresponding capillary tube 12. The pressure sensor 2 is installed between the base 7 and the bearing 6, and its installation position can monitor the oil film bearing strength data of the oil film 22 formed on the top surface of the bearing 6. In some embodiments, the thickness of the oil film 22 formed on the top surface of the bearing 6 of the bearing 6 is 0.01dm.
[0020] The output oil pipe 13 installed on the intelligent high-pressure output oil pump 4 is connected to the first oil pipe 11, and is used to output the lubricating oil of the oil film 22 formed on the top of the bearing shell 6. The input oil pipe 14 installed on the intelligent high-pressure input oil pump 5 is connected to the first oil pipe 11, and is used to input the lubricating oil to the top surface of the bearing shell 6 to form the oil film 22. The outer diameter of the output oil pipe 13 and the input oil pipe 14 is 3dm, and the inner diameter is 2dm. The intelligent high-pressure output oil pump 4 and the intelligent high-pressure input oil pump 5 are respectively connected to the oil storage tank 3. The lubricating oil output from the bearing shell 6 is discharged into the oil storage tank 3, and the lubricating oil input to the bearing shell 6 is provided through the oil storage tank 3. Check valves 15 are respectively provided on the output oil pipe 13 and the input oil pipe 14, and the pressure sensor 2 is wirelessly connected to the electronic control unit. The pressure sensor 2 monitors the oil film bearing strength data of the oil film 22 formed on the top surface of the bearing shell 6 in real time, and transmits it to the electronic control unit wirelessly. According to the actual oil film thickness requirement, the electronic control unit controls the intelligent high-pressure output oil pump 4 and the intelligent high-pressure input oil pump 5 and adjusts the thickness of the oil film 22 formed on the top surface of the bearing 6 in combination with the real-time monitoring oil film bearing strength data sent by the pressure sensor 2.
[0021] In some embodiments, the check valve 15 is a diaphragm check valve 15 to sensitively prevent backflow when the output oil pipe 13 and the input oil pipe 14 are working.
[0022] like Figure 2In some embodiments, the output oil pipe 13 and the first oil pipe 11 are connected via the second oil pipe 16, and the input oil pipe 14 and the first oil pipe 11 are also connected via the second oil pipe 16. The diameter of the second oil pipe 16 is the same as the diameter of the first oil pipe 11. The diameters of the output oil pipe 13 and the input oil pipe 14 are both larger than the diameter of the second oil pipe 16. The lubricating oil output from the input oil pipe 14 enters the first oil pipe 11 gently after passing through the transition of the second oil pipe 16, so that an oil film 22 is stably formed on the top surface of the bearing 6, avoiding a rapid increase in the thickness of the oil film, which is unfavorable for the condition. The output oil pipe 13 gently sucks out and transitions the lubricating oil in the bearing 6 through the second oil pipe 16, avoiding a rapid decrease in the thickness of the oil film of the bearing 6. Too fast a speed is not conducive to precise adjustment.
[0023] In some embodiments, the first oil pipe 11 , the output oil pipe 13 , the input oil pipe 14 and the second oil pipe 16 are all made of rubber, and the bearing bush 6 is made of stainless steel. Example
[0024] Combination Figures 1 to 5 This embodiment provides a method for adjusting the oil film 22 of a turbine thrust bearing 1, comprising: The actual oil film bearing strength data of the oil film 22 formed on the top surface of the bearing bush 6 is monitored by the pressure sensor 2 and transmitted to the electronic control unit via radio. The thickness of the oil film 22 formed on the top surface of the bearing bush 6 is positively correlated with the oil film bearing strength data monitored by the pressure sensor 2. The greater the oil film bearing strength, the thicker the oil film thickness, and vice versa.
[0025] According to the preset oil film strength data range of the electronic control unit, the actual oil film strength data is judged. The specific judgment includes how to: When the actual oil film bearing strength data is less than the preset oil film bearing strength data range, that is, the oil film thickness is too large and does not meet the oil film thickness of actual application. The electronic control unit controls the intelligent high-pressure output oil pump 4 to be turned off, and turns on the intelligent high-pressure input oil pump 5, so that the oil flows out to the output oil hole 9 through the oil storage tank 3, the intelligent high-pressure input oil pump 5, the input oil pipe 14, the first oil pipe 11, the capillary pipe 12, the input oil hole 10 and the oil pipeline in sequence until the actual oil film bearing strength data monitored by the pressure sensor 2 is within the preset oil film bearing strength data range, and then turns off the intelligent high-pressure input oil pump 5, that is, ensures that the oil film thickness is within the preset oil film thickness range.
[0026] Similar to the above, when the actual oil film bearing strength data is greater than the preset oil film bearing strength data range, the electronic control unit controls the intelligent high-pressure input oil pump 5 to close and turns on the intelligent high-pressure output oil pump 4, so that the oil flows out to the output oil pipe 13 through the output oil hole 9, the oil pipeline, the input oil hole 10, the capillary pipe 12 and the first oil pipe 11 in sequence, and enters the oil storage tank 3 through the intelligent high-pressure output oil pump 4, until the actual oil film bearing strength data monitored by the pressure sensor 2 is within the preset oil film bearing strength data range, and then the intelligent high-pressure output oil pump 4 is turned off. Such adjustment is also used to ensure that the oil film thickness is within the preset oil film thickness range.
[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.
[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A turbine thrust bearing oil film regulating device, characterized in that: It includes a thrust bearing, a pressure sensor, an oil storage tank, and an electronic control unit for controlling an intelligent high-pressure output oil pump and an intelligent high-pressure input oil pump; The thrust bearing comprises bearing shells which are arranged on the base at equal intervals; a groove is provided at the bottom of the front end surface of each bearing shell; an output oil hole is provided on the top surface of the bearing shell, and an input oil hole is provided on the front end surface; an oil pipeline is provided inside the bearing shell; two ends of the oil pipeline are respectively connected with the output oil hole and the input oil hole; a first oil pipe is arranged in the groove; the input oil hole is connected with the first oil pipe through a capillary pipe; the pressure sensor is arranged between the base and the bearing shell, and is used to monitor the oil film bearing strength data of the oil film formed on the top surface of the bearing shell; The first oil pipe is connected to the intelligent high-pressure output oil pump through the output oil pipe; the first oil pipe is connected to the intelligent high-pressure input oil pump through the input oil pipe; the intelligent high-pressure output oil pump and the intelligent high-pressure input oil pump are respectively connected to the oil storage tank; the output oil pipe and the input oil pipe are respectively provided with check valves; the pressure sensor is wirelessly connected to the electronic control unit.
2. The turbine thrust bearing oil film regulating device according to claim 1, characterized in that: The check valve is a diaphragm check valve.
3. The turbine thrust bearing oil film regulating device according to claim 1, characterized in that: The output oil pipe and the input oil pipe are respectively connected to the first oil pipe through the second oil pipe.
4. The turbine thrust bearing oil film regulating device according to claim 1, characterized in that: The diameter of the second oil pipe is the same as that of the first oil pipe; the diameters of the output oil pipe and the input oil pipe are both larger than the diameter of the second oil pipe.
5. The turbine thrust bearing oil film regulating device according to claim 1, characterized in that: The first oil pipe, the output oil pipe, the input oil pipe and the second oil pipe are all made of rubber.
6. The turbine thrust bearing oil film regulating device according to claim 1, characterized in that: The bearing bush is made of stainless steel.
7. The turbine thrust bearing oil film regulating device according to claim 1, characterized in that: The intelligent high-pressure output oil pump and the intelligent high-pressure input oil pump are respectively provided with a flow sensor and a temperature sensor.
8. A method for regulating oil film of a hydraulic turbine thrust bearing, characterized in that: include: Using a pressure sensor to monitor actual oil film bearing strength data of the oil film formed on the top surface of the bearing bush, and transmitting the data to the electronic control unit via radio; Judging the actual oil film bearing strength data according to a preset oil film bearing strength data range of the electronic control unit; When the actual oil film strength data is less than the preset oil film strength data range, the electronic control unit controls the intelligent high-pressure output oil pump to be turned off and the intelligent high-pressure input oil pump to be turned on, so that the oil flows out to the output oil hole through the oil storage tank, the intelligent high-pressure input oil pump, the input oil pipe, the first oil pipe, the capillary pipe, the input oil hole and the oil pipeline in sequence until the actual oil film strength data monitored by the pressure sensor is within the preset oil film strength data range, and then the intelligent high-pressure input oil pump is turned off; When the actual oil film bearing strength data is greater than the preset oil film bearing strength data range, the electronic control unit controls the intelligent high-pressure input oil pump to close and turns on the intelligent high-pressure output oil pump, so that the oil flows out to the output oil pipe through the output oil hole, the oil pipeline, the input oil hole, the capillary pipe and the first oil pipe in sequence, and enters the oil storage tank through the intelligent high-pressure output oil pump until the actual oil film bearing strength data monitored by the pressure sensor is within the preset oil film bearing strength data range, and then the intelligent high-pressure output oil pump is turned off.