A steam turbine rotor friction fault simulation experimental device and method

Abstract

The present invention discloses a steam turbine rotor friction fault simulation experimental device and method, including a test bench base, a motor, a rotor, a wheel disc 1, a wheel disc 2, a friction ring, a friction plate and a protective front baffle, the motor is horizontally fixedly connected to the test bench base, the motor shaft is fixedly connected to the rotor through a coupling, the two ends of the rotor are respectively connected to the test bench base through a bearing seat 1 and a bearing seat 2, the wheel disc 1 and the wheel disc 2 are fixedly connected to the rotor, the wheel disc 1 and the wheel disc 2 are fixedly connected to the cylindrical surface with a friction ring, the friction plate is installed on the protective front baffle and is located on one side of the friction ring and contacts with it, and the protective front baffle is fixedly connected to the test bench base. The present invention has a simple overall structure, the friction ring is easy to install, the friction plate is easy to adjust, the experimental device is simple to operate, it is helpful to analyze abnormal faults such as dynamic and static friction of steam turbine units, and can provide a reliable basis for identifying friction faults and judging the location of friction faults.

Description

Technical Field

[0001] The invention relates to the technical field of turbine rotor rubbing fault simulation, and in particular to a turbine rotor rubbing fault simulation experimental device and method. Background Art

[0002] As a key equipment in thermal power generation system, high-power steam turbine generator set has complex turbine structure and small gap between rotor and stator. Complex operating conditions increase the frequency of friction failures in the unit, and rotor friction failure has become one of the main failures of steam turbine rotors.

[0003] Once a rubbing fault occurs, a minor fault may affect the normal operation of the unit, reduce production efficiency, and lead to a decline in the economic benefits of the power plant. In severe cases, the rotor rubbing fault often induces other rotor faults, causing increased vibration and wear of the rotor system, permanent bending of the shaft due to heat, etc., and may even cause damage to the unit, resulting in huge economic losses.

[0004] Since the rubbing of the turbine generator rotor is not controlled by humans, the use of a rotor test bench to simulate and analyze the rubbing failure of the turbine generator rotor is an important research method. It is of vital importance to the stable operation of the turbine generator unit, and is particularly important for preventing and reducing the occurrence of equipment failures, and for the diagnosis and prevention of early failures.

[0005] The existing rotor friction test device generally installs a frame with a fixed friction screw or friction block on the periphery of the rotor, and simulates the friction failure between the rotor and the stator by twisting the friction screw or moving the friction block to make it directly contact with the rotor surface. This method cannot simulate different forms of friction failures, and the friction screw or friction block is in contact with the rotor surface for a long time, causing serious damage to the entire shaft system and a low safety factor. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a steam turbine rotor rubbing fault simulation experimental device and method to solve the technical problems existing in the prior art.

[0007] The technical solution adopted by the present invention is: a steam turbine rotor friction fault simulation experimental device, including an experimental platform base, a motor, a coupling, a bearing seat 1, a rotor, a wheel disc 1, a wheel disc 2, a friction ring, a friction plate, a protective front baffle, a sliding bearing, and a bearing seat 2. The motor is horizontally fixedly connected to the experimental platform base, the motor shaft is fixedly connected to the rotor through a coupling, the two ends of the rotor are respectively connected to the experimental platform base through bearing seat 1 and bearing seat 2, the wheel disc 1 and the wheel disc 2 are fixedly connected to the rotor, the wheel disc 1 and the wheel disc 2 are fixedly connected to the cylindrical surface with a friction ring, the friction plate is installed on the protective front baffle and is located on one side of the friction ring and contacts with it, and the protective front baffle is fixedly connected to the experimental platform base.

[0008] Preferably, vibration acceleration sensors or vibration velocity sensors are installed on both ends of the above-mentioned friction plate, and effective friction fault vibration signals can be obtained by simulating friction fault tests.

[0009] Preferably, the above-mentioned wear plate is connected to two guide rings respectively through two guide rods, and the two guide rings are fixedly connected to the two ends of the protective front baffle. Both guide rings are provided with an adjusting locking screw, and the inner ends of the adjusting locking screws respectively abut against the two guide rods.

[0010] Preferably, a sliding bearing is fixedly connected to the rotor and is close to the bearing seat.

[0011] Preferably, an annular groove is provided on the cylindrical surface of the wheel disc 1, and the friction ring adopts a separated half structure, which is fastened with screws at the joint.

[0012] Preferably, a plurality of trapezoidal holes are evenly distributed in the circumferential direction of the annular groove, a plurality of trapezoidal terraces are circumferentially arranged on the inner side of the rubbing ring, and the trapezoidal terraces are embedded in the trapezoidal holes.

[0013] Preferably, the wheel has a protective rear baffle on the other side of the protective front baffle, the protective rear baffle is fixedly connected to the base of the laboratory bench, and the upper ends of the protective rear baffle and the protective front baffle are fixedly connected to the protective upper baffle with an arc-shaped cross-section.

[0014] Preferably, the motor is fixedly connected to the test bench base via a motor fixing seat 1 and a motor fixing seat 2 at the front and rear, respectively.

[0015] Preferably, the above-mentioned rubbing ring is a full-circumference rubbing ring or a partial rubbing ring.

[0016] The invention discloses an experimental method for a steam turbine rotor friction fault simulation experimental device, which comprises the following steps: installing a friction ring on a wheel disc, adjusting the distance between a friction plate and the friction ring so that the friction ring contacts the friction plate, installing a protective rear baffle, a protective front baffle and a protective upper baffle, starting a motor, and performing a friction test to simulate a local friction fault between a steam turbine rotor and a stator.

[0017] Beneficial effects of the present invention: Compared with the prior art, the present invention avoids the damage of the rotor by long-term contact between the shaft system and the friction parts through the friction ring installed on the wheel disc to simulate the friction between the friction plate; the friction ring is easy to install and disassemble, and the friction fault under different friction conditions can be simulated at any time by replacing the friction ring installed on the wheel disc; the distance between the friction plate installed on the protective baffle and the friction ring can be adjusted at any time to simulate the friction fault between the rotor and the stator, and the friction fault signal acquisition sensor can be arranged on the friction plate to obtain the friction fault signal. The steam turbine rotor friction fault simulation experimental device of the present invention has a simple overall structure, the friction ring is easy to install, the friction plate is easy to adjust, and the experimental device is simple to operate, which is helpful for analyzing abnormal faults such as dynamic and static friction in the steam turbine unit, and can provide a reliable basis for identifying friction faults and judging the location of friction faults, and can be well applied to steam turbine rotor friction fault experimental research and teaching experimental research. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 It is a right view structural schematic diagram of the present invention;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the roulette wheel of the present invention;

[0021] Figure 4 This is a schematic diagram of the main structure of the roulette wheel of the present invention.

[0022] Figure 5 It is a schematic diagram of the right side structure of the roulette wheel of the present invention;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the friction ring of the present invention;

[0024] Figure 7 1. It is a right exploded schematic diagram of the full-circle friction ring of the present invention;

[0025] Figure 8 It is a right-view exploded schematic diagram of a local friction ring of the present invention.

[0026] Fig. 9 It is a three-dimensional structural schematic diagram after the present invention is installed.

[0027] The numbers in the figure represent: 1. laboratory bench base; 2. motor fixing seat; 3. driving motor; 4. motor fixing seat; 5. coupling; 6. bearing seat; 7. rotor; 8. wheel disc; 9. wheel disc; 10. wear ring; 11. wear plate; 12. protective front baffle; 13. sliding bearing; 14. bearing seat; 15. protective rear baffle; 16. protective upper baffle; 17. guide rod; 18. annular groove; 19. trapezoidal groove; 20. trapezoidal table; 21. adjustment locking screw; 22. guide ring. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Example 1: Figure 1-9 As shown, a steam turbine rotor friction fault simulation experimental device includes a test bench base 1, a motor 3, a coupling 5, a bearing seat 1 6, a rotor 7, a wheel disc 1 8, a wheel disc 2 9, a friction ring 10, a friction plate 11, a protective front baffle 12, a sliding bearing 13, and a bearing seat 2 14. The motor 3 is horizontally fixedly connected to the test bench base 1, the motor shaft is fixedly connected to the rotor 7 through the coupling 5, and the two ends of the rotor 7 are respectively connected to the test bench base 1 through the bearing seat 1 6 and the bearing seat 2 14, the wheel disc 1 8 and the wheel disc 2 9 are fixedly connected to the rotor 7, and the friction ring 10 is fixedly connected to the cylindrical surface of the wheel disc 1 8 and the wheel disc 2 9, the friction plate 11 is installed on the protective front baffle 12 and is located on one side of the friction ring 10 and contacts with it, and the protective front baffle 12 is fixedly connected to the test bench base 1.

[0030] Preferably, vibration acceleration sensors or vibration velocity sensors are installed at both ends of the abrasion plate 11, and effective abrasion fault vibration signals can be obtained by simulating abrasion fault tests.

[0031] Preferably, the above-mentioned wear plate 11 is respectively connected to two guide rings 22 through two guide rods 17, and the two guide rings 22 are fixedly connected to the two ends of the protective front baffle 12. The two guide rings 22 are each provided with an adjusting locking screw 21, and the inner ends of the two adjusting locking screws 21 respectively abut against the two guide rods 17. The distance between the wear plate 11 and the wear ring is convenient and quick to adjust, and the connection is stable and reliable. The rotor wear failure is simulated by changing the distance between the wear plate 11 installed on the protective baffle 12 and the wear ring 10.

[0032] Preferably, a sliding bearing 13 is fixedly connected to the rotor 7 and is close to the bearing seat 14 .

[0033] Preferably, an annular groove 18 is provided on the cylindrical surface of the wheel disc 8, and the wear ring 10 adopts a separated half structure, which is divided into two parts a and b. Screws are used for locking at the joint, and the wear ring is clamped with a groove structure to achieve the limitation of the wear ring. The wear ring 10 can be replaced at any time and can meet the simulation of full-circle wear failure and local wear failure. The annular groove can fix the position of the wear ring to avoid axial displacement and radial displacement of the wear ring.

[0034] Preferably, a plurality of trapezoidal holes 19 are evenly distributed in the circumferential direction of the annular groove 18, a plurality of trapezoidal steps 20 are arranged circumferentially on the inner side of the wear ring 10, and the trapezoidal steps 20 are embedded in the trapezoidal holes 19. The trapezoidal holes and trapezoidal steps are used for inlaying to achieve support of the circumferential force of the wear ring, and the connection stability between the wear ring and the wheel disc is better, which effectively fixes the wear ring on the wheel disc to prevent circumferential movement of the wear ring when simulating a wear failure.

[0035] Preferably, the wheel 8 has a protective rear baffle 15 on the other side of the protective front baffle 12, and the protective rear baffle 15 is fixedly connected to the experimental bench base 1 by screws. The upper ends of the protective rear baffle 15 and the protective front baffle 12 are fixedly connected to the protective upper baffle 16 with an arc-shaped cross-section by screws, which can make the operation safer during the collision and friction process and improve the safety of the experimental device.

[0036] Preferably, the motor 3 is fixedly connected to the test bench base 1 through a motor fixing base 1 4 and a motor fixing base 2 2 at the front and rear, respectively, and the connection is stable and reliable.

[0037] Preferably, the above-mentioned friction ring adopts a full-circle friction ring or a partial friction ring (the cylinder is elliptical), which can realize friction experiments under different conditions. The full-circle friction ring adopts a rigid material, and the inner circle is designed with four convex shoulder structures that are closely combined with the concave holes on the wheel disc. The friction ring is fixed to the wheel disc by tightening screws to prevent the friction ring from axial or radial movement during the rotation of the rotor. The partial friction ring adopts a rigid material, the overall outer circle is designed to be elliptical, and the inner circle is designed with four convex shoulder structures that are closely combined with the concave holes on the wheel disc. The friction ring is fixed to the wheel disc by tightening screws to prevent the friction ring from axial or radial movement during the rotation of the rotor.

[0038] Embodiment 2: An experimental method for a turbine rotor friction fault simulation experimental device, the method comprising: installing the friction ring on the wheel disc, adjusting the distance between the friction plate and the friction ring so that the friction ring contacts the friction plate, installing a protective rear baffle, a protective front baffle and a protective upper baffle, starting the motor, and performing a friction test to simulate a local friction fault between the turbine rotor and the stator.

[0039] Compared with the prior art, the advantages of the present invention are: by simulating the friction between the friction ring installed on the wheel and the friction plate, the damage to the rotor caused by the long-term contact between the shaft system and the friction parts is avoided; the friction ring is easy to install, and the friction fault under different friction conditions can be simulated at any time by replacing the friction ring installed on the wheel; the distance between the friction plate installed on the protective baffle and the friction ring can be adjusted at any time to simulate the friction fault between the rotor and the stator, and the dynamic and static friction fault signals can be obtained by arranging the friction fault signal acquisition sensor on the friction plate. The steam turbine rotor friction fault simulation experimental device of the present invention has a simple overall structure, the friction ring is easy to install, the friction plate is easy to adjust, and the experimental device is simple to operate, which is helpful for analyzing abnormal faults such as dynamic and static friction in the steam turbine unit, and can provide a reliable basis for identifying friction faults and judging the location of friction faults, and can be well applied to steam turbine rotor friction fault experimental research and teaching experimental research.

[0040] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A steam turbine rotor friction fault simulation experimental device, characterized in that: The experimental platform comprises a base (1), a motor (3), a coupling (5), a bearing seat 1 (6), a rotor (7), a wheel disc 1 (8), a wheel disc 2 (9), a friction ring (10), a friction plate (11), a protective front baffle (12) and a bearing seat 2 (14), wherein the motor (3) is horizontally fixedly connected to the experimental platform base (1), the motor shaft is fixedly connected to the rotor (7) through the coupling (5), the two ends of the rotor (7) are respectively connected to the experimental platform base (1) through the bearing seat 1 (6) and the bearing seat 2 (14), the wheel disc 1 (8) and the wheel disc 2 (9) are fixedly connected to the rotor (7), and the cylindrical surfaces of the wheel disc 1 (8) and the wheel disc 2 (9) are fixedly connected. A friction ring (10) is connected, a friction plate (11) is mounted on the protective front baffle (12) and is located on one side of the friction ring (10) and contacts the friction ring, and the protective front baffle (12) is fixedly connected to the experimental table base (1); vibration acceleration sensors or vibration velocity sensors are installed at both ends of the friction plate (11); the friction plate (11) is respectively connected to two guide rings (22) through two guide rods (17), and the two guide rings (22) are fixedly connected to both ends of the protective front baffle (12), and the two guide rings (22) are each provided with an adjusting locking screw (21), and the inner ends of the two adjusting locking screws (21) respectively abut against the two guide rods (17).

2. A steam turbine rotor friction fault simulation experimental device according to claim 1, characterized in that: A sliding bearing (13) is fixedly connected to the rotor (7) and is close to the bearing seat (14).

3. A steam turbine rotor friction fault simulation experimental device according to claim 1, characterized in that: The cylindrical surface of the wheel disc 1 (8) is provided with an annular groove (18), and the abrasion ring (10) adopts a separated half structure, and is locked with screws at the joint.

4. A steam turbine rotor friction fault simulation experimental device according to claim 3, characterized in that: A plurality of trapezoidal holes (19) are evenly distributed in the circumferential direction of the annular groove (18); a plurality of trapezoidal terraces (20) are arranged in the circumferential direction of the inner side of the rubbing ring (10); and the trapezoidal terraces (20) are embedded in the trapezoidal holes (19).

5. The steam turbine rotor friction fault simulation experimental device according to claim 1 is characterized in that: The wheel disc 1 (8) has a protective rear baffle (15) on the other side of the protective front baffle (12), the protective rear baffle (15) is fixedly connected to the experimental table base (1), and the upper ends of the protective rear baffle (15) and the protective front baffle (12) are fixedly connected to a protective upper baffle (16) with an arc-shaped cross-section.

6. The steam turbine rotor friction fault simulation experimental device according to claim 1 is characterized in that: The front and rear ends of the motor (3) are fixedly connected to the experimental platform base (1) via a motor fixing seat 1 (4) and a motor fixing seat 2 (2) respectively.

7. The steam turbine rotor friction fault simulation experimental device according to claim 1 is characterized in that: The rubbing ring adopts a full-circle rubbing ring or a partial rubbing ring.

8. The experimental method of a steam turbine rotor friction fault simulation experimental device according to any one of claims 1 to 7, characterized in that: The method is: installing the friction ring on the wheel disc, adjusting the distance between the friction plate and the friction ring so that the friction ring contacts the friction plate, installing a protective rear baffle, a protective front baffle and a protective upper baffle, starting the motor, and performing a friction experiment to simulate a local friction fault between the turbine rotor and the stator.

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