A device and method for detecting the wear degree of a steam turbine inner bearing

Abstract

The application discloses a kind of for detecting device and detection method of turbine internal bearing wear degree, it is related to turbine maintenance field, including device main body, adjusting assembly is arranged on device main body, adjusting assembly includes counterweight seat, electromagnetic brake is connected on device main body, screw rod is connected on electromagnetic brake, adjusting frame is connected on screw rod, counterweight block is connected on adjusting frame, and electric sliding table is installed on adjusting frame.The setting of adjusting assembly and detection assembly, by the setting of adjusting assembly, it is convenient for roller to contact with the rotor of turbine, and it is convenient to adapt different models of turbine with stronger flexibility, roller and rotor are contacted in the area between turbine and generator, cooperate displacement sensor to detect so as not to disassemble bearing, simple structure is easy to operate, and it is convenient to detect the wear degree of radial support bearing with low cost, maintenance is also simple and convenient, simultaneously without disassembling bearing will not cause the influence to the work of turbine.

Description

Technical Field

[0001] This invention relates to the field of steam turbine maintenance, specifically to a device and method for detecting the wear degree of internal bearings in steam turbines. Background Technology

[0002] A steam turbine is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle and becomes an accelerated airflow, which is then injected onto the blades of the rotor. This causes the blades to be thrust, driving the rotor to rotate and do work. It can convert the thermal energy of steam into mechanical energy. It is the prime mover of thermal power plants and ships. When installed in a thermal power plant, the output end of the steam turbine is connected to the input end of the generator, driving the rotor inside the generator to rotate and generate electricity through the principle of magnetoelectricity.

[0003] Bearings are an important component of steam turbines, mainly consisting of radial support bearings and thrust bearings. Radial support bearings support the rotor mass and the centrifugal force generated by the rotor, and determine the rotor's center position, ensuring that the moving and stationary parts of the steam turbine maintain normal radial clearance. Thrust bearings, on the other hand, bear the axial thrust exerted on the rotor by the steam and generator magnetic field, and determine the rotor's axial position, maintaining its axial clearance. When radial support bearings wear, it can lead to rotor mass imbalance, generating centrifugal force and causing rotor wobble. To avoid excessive wear caused by rotor wobble and increased operating costs, it is necessary to regularly inspect the wear degree of the radial support bearings inside the steam turbine.

[0004] When inspecting radial support bearings inside a steam turbine, it is usually necessary to remove the bearing from the turbine and send it to a testing device. The bearing is then inspected by magnetic induction during rotation to check the wear degree of the radial support bearing. Alternatively, the radial support bearing can be scanned by an instrument, and the wear degree can be checked by computer calculation and modeling. Although both testing methods have high accuracy and can accurately detect the location and degree of bearing wear, they are expensive to purchase. The high precision of the testing equipment also requires more maintenance and upkeep costs. In addition, removing the bearing from the steam turbine is a cumbersome operation and can easily affect the normal operation of the power plant. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a device and method for detecting the wear degree of bearings inside a steam turbine, so as to solve the technical problems of high cost and cumbersome operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for detecting the wear degree of bearings inside a steam turbine, comprising a device body, an adjustment assembly on the device body, the adjustment assembly including a counterweight seat, an electromagnetic brake connected to the device body, a lead screw connected to the electromagnetic brake, an adjustment frame connected to the lead screw, a counterweight block connected to the adjustment frame, an electric slide table mounted on the adjustment frame, a detection assembly on the electric slide table, the detection assembly including a support frame, a displacement sensor mounted on the support frame, rollers connected to the support frame, and hydraulic dampers and springs respectively connected to the rollers.

[0007] By adopting the above technical solution, the roller can easily contact the turbine rotor by adjusting the component settings. It is highly flexible and easy to adapt to different models of turbines. The roller and rotor are in contact in the area between the turbine and the generator. With the help of displacement sensors, detection is carried out without disassembling the bearing. The normal operation of the turbine will not be affected during detection.

[0008] Furthermore, a control cabinet and a touch screen are installed on the counterweight base, and a bracket that runs through the bottom of the adjustment frame is connected to the main body of the device.

[0009] By adopting the above technical solution, staff can turn the touch screen, motor, electromagnetic brake, electric slide and displacement sensor on or off through the control cabinet. The displacement sensor transmits the data to the touch screen for staff to view.

[0010] Furthermore, a motor for driving the lead screw to rotate is mounted on the bracket, and a slider is connected to the support frame.

[0011] By adopting the above technical solution, after the motor starts, the output end drives the lead screw to rotate. Since the adjusting frame is threadedly connected to the lead screw, the adjusting frame drives the electric slide, support frame, displacement sensor, guide rod, roller, hydraulic damper and spring to move downward after the lead screw rotates.

[0012] Furthermore, the adjusting bracket is threadedly connected to the lead screw, and the adjusting bracket is movably connected to the support.

[0013] By adopting the above technical solution, the electromagnetic brake no longer limits the lead screw after it is closed, allowing the lead screw to rotate. After the motor starts, the output end drives the lead screw to rotate. Since the adjusting frame is threadedly connected to the lead screw, the adjusting frame drives the electric slide, support frame, displacement sensor, guide rod, roller, hydraulic damper and spring to move downward after the lead screw rotates.

[0014] Furthermore, a guide rod is connected between the displacement sensor rollers, and the guide rod is movably connected to the support frame.

[0015] By adopting the above technical solution, when the internal bearings of the steam turbine are severely worn, the steam turbine rotor will shake up and down, which will cause the roller to drive the probe of the displacement sensor to shake up and down. The displacement sensor will then transmit the data to the touch screen for staff to view.

[0016] Furthermore, the slider is in the shape of an inverted "T", and the adjustment frame has a groove that matches the slider.

[0017] By adopting the above technical solution, after the electric slide is started, the output end drives the displacement sensor, guide rod, roller, hydraulic damper and spring to move laterally through the bracket, so that the roller corresponds to the turbine rotor.

[0018] Furthermore, the main body of the device is connected to four casters, and the four casters are distributed in a rectangular array.

[0019] By adopting the above technical solution, the staff can use the casters to push the main body of the device to the side of the steam turbine so that the rollers correspond to the rotor of the steam turbine, increasing the flexibility of the device and making it easier to move so as to test multiple steam turbines.

[0020] A method for detecting the wear degree of internal bearings in a steam turbine, the specific steps of which are as follows: Step 1: The staff uses the casters to push the main body of the device next to the steam turbine so that the rollers correspond to the turbine rotor. When the steam turbine is too large to align the rollers with the turbine rotor, the staff activates the electric slide via the touch screen. After the electric slide is activated, the output end drives the displacement sensor, guide rod, rollers, hydraulic damper and spring to move laterally through the bracket so that the rollers correspond to the turbine rotor. Then the staff deactivates the electromagnetic brake and activates the motor via the touch screen. Step two: After the electromagnetic brake is turned off, the lead screw is no longer limited and can rotate. After the motor starts, the output end drives the lead screw to rotate. Since the adjusting frame is threadedly connected to the lead screw, the adjusting frame drives the electric slide, support frame, displacement sensor, guide rod, roller, hydraulic damper and spring to move downward after the lead screw rotates. This causes the roller to contact the turbine rotor. As the roller continues to move downward, the piston rod of the hydraulic damper is pressed into the cylinder halfway. At the same time, the probe of the displacement sensor is pressed into the sensor halfway. Then, the operator uses the touch screen to reset the displacement sensor value to zero and activate the electromagnetic brake to limit the lead screw. At the same time, the counterweight and counterweight block balance the weight to prevent the device from tipping over. Step 3: When the internal bearings of the steam turbine are severely worn, the steam turbine rotor will shake up and down, causing the roller to move the probe of the displacement sensor up and down. The displacement sensor transmits the data to the touch screen for the staff to view. The more violently the displacement sensor probe shakes up and down, the more severe the wear of the internal bearings of the steam turbine. The smaller the shaking amplitude of the steam turbine rotor, the less the wear of the steam turbine bearings. At the same time, the roller contacts the steam turbine rotor to prevent the displacement sensor probe from being worn by the rotor. The roller is reset by the spring, and the hydraulic damper increases the damping to prevent the roller from shaking arbitrarily due to the spring and affecting the data.

[0021] In summary, the present invention has the following main beneficial effects: This invention utilizes adjustable and detection components. The adjustable component facilitates contact between the roller and the turbine rotor, offering high flexibility and adaptability to different turbine models. The roller and rotor are located in the area between the turbine and generator, and detection is performed using a displacement sensor, eliminating the need to disassemble the bearing. This process does not affect the normal operation of the turbine. More severe wear on the radial support bearing results in greater rotor wobble, and vice versa. The displacement sensor measures the wobble displacement amplitude during rotor rotation to calculate the wear degree of the radial support bearing. A larger probe displacement amplitude indicates greater wear on the radial support bearing. Simultaneously, the displacement sensor transmits the dimensional data generated by the probe displacement to a touch screen for operators to view the rotor wobble amplitude. The invention features a simple structure, convenient operation, low cost, and easy detection of radial support bearing wear. Maintenance is also simple and convenient, and the absence of bearing disassembly does not affect turbine operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the device structure of the present invention; Figure 2 This is a schematic cross-sectional view of the support frame structure of the present invention; Figure 3 This is a schematic diagram of the support frame structure of the present invention; Figure 4 This is a schematic diagram of the roller structure of the present invention; Figure 5 This is a schematic diagram of the adjustment frame structure of the present invention.

[0023] In the diagram: 1. Main body of the device; 2. Control cabinet; 3. Touch screen display; 4. Support frame; 5. Adjustment assembly; 501. Counterweight seat; 502. Adjustment frame; 503. Motor; 504. Electromagnetic brake; 505. Lead screw; 506. Counterweight block; 507. Electric slide table; 508. Slider; 6. Detection assembly; 601. Support frame; 602. Displacement sensor; 603. Guide rod; 604. Roller; 605. Hydraulic damper; 606. Spring; 7. Caster wheel. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] The embodiments of the present invention will now be described.

[0026] A device for detecting the wear degree of internal bearings in a steam turbine, such as Figure 1 , 2 As shown in Figures 4 and 5, the device includes a main body 1, on which an adjustment component 5 is provided.

[0027] Specifically, the adjustment component 5 includes a counterweight seat 501, an electromagnetic brake 504 is installed on the top of the main body 1, a lead screw 505 is connected to the top of the electromagnetic brake 504, an adjustment frame 502 is connected to the outer surface of the lead screw 505, a counterweight block 506 is connected to one side of the adjustment frame 502, and an electric slide table 507 is installed on one side of the top of the adjustment frame 502. The adjustment component 5 facilitates the contact between the roller 604 and the turbine rotor.

[0028] The electric slide table 507 is equipped with a detection component 6.

[0029] Specifically, the detection component 6 includes a support frame 601, on which a displacement sensor 602 is mounted. A roller 604 is connected to the support frame 601 via a guide rod 603. Hydraulic dampers 605 are connected to both sides of the top of the roller 604, and a spring 606 is connected to the top of the roller 604. The wear degree of the radial support bearing is calculated by measuring the sway displacement amplitude when the rotor rotates through the displacement sensor 602.

[0030] See Figure 1 , 2In the above embodiments, a control cabinet 2 is installed on one side of the top of the counterweight 501. The control cabinet 2 is electrically connected to the touch screen 3, the motor 503, the electromagnetic brake 504, the electric slide 507, and the displacement sensor 602. The touch screen 3 is installed on the other side of the top of the counterweight 501. A bracket 4 that passes through the bottom of the adjustment frame 502 is connected to the main body 1 of the device. A motor 503 for driving the lead screw 505 to rotate is installed on one side of the bracket 4. Two sliders 508 are connected to the bottom of the support frame 601. Four universal wheels 7 are connected to the main body 1 of the device, and the four universal wheels 7 are distributed in a rectangular array. The operator turns the touch screen 3, motor 503, electromagnetic brake 504, electric slide 507, and displacement sensor 602 on or off through the control cabinet 2.

[0031] See Figure 1 , 2 In the above embodiments, the adjusting frame 502 is threadedly connected to the lead screw 505, and the adjusting frame 502 is slidably connected to the bracket 4. The slider 508 is in the shape of an inverted "T", and the adjusting frame 502 is provided with a sliding groove that matches the slider 508. The support frame 601 is slidably connected to the adjusting frame 502 through the slider 508 and the sliding groove. The setting of the adjusting component 5 facilitates the contact between the roller 604 and the turbine rotor.

[0032] See Figure 1 , 2 In embodiments 6 and 4, a guide rod 603 is connected between the displacement sensor 602 and the roller 604, and the guide rod 603 is slidably connected to the support frame 601. The wear degree of the radial support bearing is calculated by measuring the sway displacement amplitude when the rotor rotates through the displacement sensor 602.

[0033] A method for detecting the wear degree of internal bearings in a steam turbine, the specific steps of which are as follows: Step 1: The staff pushes the main body 1 of the device to the side of the steam turbine using the casters 7 so that the roller 604 corresponds to the rotor of the steam turbine. When the steam turbine is too large to align the roller 604 with the rotor, the staff activates the electric slide 507 via the touch screen 3. After the electric slide 507 is activated, the output end drives the displacement sensor 602, guide rod 603, roller 604, hydraulic damper 605 and spring 606 to move laterally via the bracket so that the roller 604 corresponds to the rotor of the steam turbine. After that, the staff deactivates the electromagnetic brake 504 and activates the motor 503 via the touch screen 3. Step 2: After the electromagnetic brake 504 is closed, it no longer limits the lead screw 505, allowing it to rotate. After the motor 503 starts, its output drives the lead screw 505 to rotate. Since the adjusting frame 502 is threadedly connected to the lead screw 505, the lead screw 505 rotates, causing the adjusting frame 502 to drive the electric slide table 507, support frame 601, displacement sensor 602, guide rod 603, roller 604, hydraulic damper 605, and spring 606 to move downwards, so that the roller 604 contacts the turbine rotor. As the roller 604 continues to move downwards, the piston rod of the hydraulic damper 605 is pressed into the cylinder halfway, and at the same time, the probe of the displacement sensor 602 is pressed into the sensor halfway. Then, the operator uses the touch screen 3 to reset the value of the displacement sensor 602 to zero and activate the electromagnetic brake 504 to limit the lead screw 505. At the same time, the counterweight seat 501 and counterweight block 506 balance the weight to prevent the device from tipping over. Step 3: When the internal bearings of the steam turbine are severely worn, the steam turbine rotor will shake up and down, causing the roller 604 to drive the probe of the displacement sensor 602 to shake up and down. The displacement sensor 602 transmits the data to the touch screen 3 for the staff to view. The more violently the probe of the displacement sensor 602 shakes up and down, the more severe the wear of the internal bearings of the steam turbine. The smaller the shaking amplitude of the steam turbine rotor, the less the wear of the steam turbine bearings. At the same time, the roller 604 contacts the steam turbine rotor to prevent the probe of the displacement sensor 602 from being worn by the rotor. The spring 606 assists the roller 604 to reset, and the hydraulic damper 605 increases the damping to prevent the roller 604 from shaking arbitrarily due to the influence of the spring 606 and affecting the data.

[0034] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A device for detecting the wear degree of internal bearings of a steam turbine, comprising a device body (1), characterized in that: An adjustment component (5) is provided on the main body (1) of the device. The adjustment component (5) includes a counterweight (501). An electromagnetic brake (504) is connected to the main body (1). A lead screw (505) is connected to the electromagnetic brake (504). An adjustment frame (502) is connected to the lead screw (505). A counterweight (506) is connected to the adjustment frame (502). An electric slide (507) is installed on the adjustment frame (502). A detection component (6) is provided on the electric slide (507). The detection component (6) includes a support frame (601). A displacement sensor (602) is installed on the support frame (601). A roller (604) is connected to the support frame (601). A hydraulic damper (605) and a spring (606) are respectively connected to the roller (604).

2. The device for detecting the wear degree of internal bearings of a steam turbine according to claim 1, characterized in that: The counterweight base (501) is equipped with a control cabinet (2) and a touch screen (3), and the main body of the device (1) is connected to a bracket (4) that passes through the bottom of the adjustment frame (502).

3. The device for detecting the wear degree of internal bearings of a steam turbine according to claim 2, characterized in that: The bracket (4) is equipped with a motor (503) for driving the lead screw (505) to rotate, and the support frame (601) is connected with a slider (508).

4. The device for detecting the wear degree of internal bearings of a steam turbine according to claim 2, characterized in that: The adjusting frame (502) is threadedly connected to the lead screw (505), and the adjusting frame (502) is movably connected to the bracket (4).

5. The device for detecting the wear degree of internal bearings of a steam turbine according to claim 1, characterized in that: A guide rod (603) is connected between the displacement sensor (602) rollers (604), and the guide rod (603) is movably connected to the support frame (601).

6. The device for detecting the wear degree of internal bearings of a steam turbine according to claim 3, characterized in that: The slider (508) is in the shape of an inverted "T", and the adjusting frame (502) has a groove that matches the slider (508).

7. The device for detecting the wear degree of internal bearings of a steam turbine according to claim 1, characterized in that: The main body (1) of the device is connected to four casters (7), and the four casters (7) are arranged in a rectangular array.

8. A method for detecting the wear degree of internal bearings of a steam turbine according to any one of claims 1 to 7, comprising the following specific steps: Step 1: The staff pushes the main body (1) of the device to the side of the steam turbine using the caster wheel (7) so that the roller (604) corresponds to the rotor of the steam turbine. When the steam turbine is too large to correspond the roller (604) to the rotor, the staff turns on the electric slide (507) through the touch screen (3). After the electric slide (507) is started, the output end drives the displacement sensor (602), guide rod (603), roller (604), hydraulic damper (605) and spring (606) to move laterally through the bracket so that the roller (604) corresponds to the rotor of the steam turbine. Then the staff turns off the electromagnetic brake (504) and turns on the motor (503) through the touch screen (3). Step two: After the electromagnetic brake (504) is closed, it no longer limits the lead screw (505), allowing the lead screw (505) to rotate. After the motor (503) starts, its output drives the lead screw (505) to rotate. Since the adjusting frame (502) is threadedly connected to the lead screw (505), the lead screw (505) rotates, and the adjusting frame (502) drives the electric slide (507), support frame (601), displacement sensor (602), guide rod (603), roller (604), hydraulic damper (605), and spring (606). The roller (604) moves downward, thus bringing it into contact with the turbine rotor. As the roller (604) continues to move downward, the piston rod of the hydraulic damper (605) is pressed into the cylinder halfway, and at the same time, the probe of the displacement sensor (602) is pressed into the sensor halfway. Then, the operator uses the touch screen (3) to reset the value of the displacement sensor (602) to zero and activate the electromagnetic brake (504) to limit the lead screw (505). At the same time, the counterweight (501) and counterweight (506) balance the weight to prevent the device from tipping over. Step 3: When the internal bearings of the steam turbine are severely worn, the steam turbine rotor will shake up and down, causing the roller (604) to drive the probe of the displacement sensor (602) to shake up and down. The displacement sensor (602) transmits the data to the touch screen (3) for the staff to view. The more violently the probe of the displacement sensor (602) shakes up and down, the more severe the wear of the internal bearings of the steam turbine. The smaller the amplitude of the steam turbine rotor shaking, the less the wear of the steam turbine bearings. At the same time, the roller (604) contacts the steam turbine rotor to avoid the displacement sensor (602) probe being worn by the rotor. At the same time, the spring (606) assists the roller (604) to reset. At the same time, the hydraulic damper (605) increases the damping to prevent the roller (604) from shaking randomly due to the influence of the spring (606) and affecting the data.

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