Device and method for measuring coast-down amount of gas turbine rotor

Abstract

The present invention belongs to the technical field of thermal energy and power engineering, and particularly relates to a device and method for measuring the coast-down amount of a gas turbine rotor. In the present invention, a gear of a rotating assembly is meshed with a gear of the gas turbine rotor, so that the rotating assembly is connected to the gas turbine rotor; a fixed torque is applied to the rotating assembly through a torque assembly to drive the gas turbine rotor to rotate; and the coast-down amount of the gas turbine rotor is measured through a measuring assembly. In the present invention, the position of the torque assembly relative to the rotating assembly is accurately controllable, and after the rotating assembly rotates a fixed angle under the action of the torque, the torque can be automatically withdrawn, and the torque applied to the gas turbine rotor by the present invention is accurately controllable. After applying an accurate torque to the gas turbine rotor by the present invention, the coast-down amount of the gas turbine rotor under the action of the torque can be accurately measured, and the problem of quantitatively evaluating the rotation state of the gas turbine rotor can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal energy and power engineering, and particularly relates to a device and method for measuring the coast-down amount of a gas turbine rotor. Background Art

[0002] In the field of gas turbines, manual barring devices are widely used. The manual barring device is connected to the gas turbine rotor through a gear. By manually rotating the shaft of the barring device, the gas turbine rotor can be rotated, and then it can be judged whether there is a jamming fault in the gas turbine rotor.

[0003] However, the conventional manual barring device can only qualitatively judge whether there is a jamming fault in the rotor, and cannot quantitatively evaluate the rotation state of the rotor. Therefore, there is an urgent need for a barring device that can quantitatively evaluate the rotation state of a gas turbine rotor to solve this dilemma.

[0004] For example: When a gas turbine operating under rated conditions encounters a fault and shuts down, due to the different thermal expansion coefficients of the components of the rotor system, thermal stress is generated between the static and dynamic structural components during the cooling process, resulting in the rotor being jammed and unable to rotate, that is, a journal bearing seizure fault occurs. When a journal bearing seizure fault occurs in a gas turbine, it is necessary to cool for a long time. The thermal stress of each component gradually decreases as the cooling time increases, and the rotor state also gradually returns to normal as the cooling time increases. During the cooling process, it is necessary to accurately evaluate the rotation state of the gas turbine rotor. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for measuring the coast-down amount of a gas turbine rotor.

[0006] A device for measuring the coast-down amount of a gas turbine rotor includes a rotating assembly, a torque assembly, and a measuring assembly; the rotating assembly is used to connect with the gas turbine rotor; the torque assembly is used to apply a fixed torque. Under the action of the torque, the gas turbine rotor starts to rotate. When it rotates to a fixed angle, the torque is automatically withdrawn, and the gas turbine rotor starts to coast down. After the coast-down ends, the coast-down amount of the gas turbine rotor is measured by the measuring assembly.

[0007] Furthermore, the rotating assembly includes a sleeve, a rotating rod, and a gear; the measuring assembly includes a graduated disk; the gear is installed at the bottom of the rotating rod and is used to connect with the gas turbine rotor; the upper part of the rotating rod is connected to the center of the graduated disk; the sleeve is a hollow cylinder, and the whole sleeve is sleeved outside the rotating rod to ensure that the position of the sleeve remains fixed when the rotating rod rotates; there are scale lines and a starting line on the graduated disk; a measuring line parallel to the axis of the sleeve is designed on the upper surface of the sleeve; after the coast-down of the gas turbine rotor ends, the coast-down amount of the gas turbine rotor is obtained by measuring the relative position between the measuring line on the sleeve and the starting line on the graduated disk.

[0008] Further, the rotating rod adopts a five-section design. The first section from bottom to top is designed as a thin cylinder, the second section is designed as a spherical shape, the third section is designed as a thick cylinder, the fourth section is designed as a spherical shape, and the fifth section is designed as a thick cylinder. A first round hole is opened at the center of the upper surface of the sleeve. The diameter of the first round hole is larger than the diameter of the thick cylinder of the fifth section of the rotating rod and smaller than the diameter of the spherical shape of the fourth section of the rotating rod. A second round hole is opened at the center of the lower surface of the sleeve. The diameter of the second round hole is larger than the diameter of the thin cylinder of the first section of the rotating rod and smaller than the diameter of the spherical shape of the second section of the rotating rod.

[0009] Further, a hexagonal cylinder is provided at the center of the upper surface of the graduated disc, and the hexagonal cylinder is rotated by a wrench to drive the rotation of the graduated disc.

[0010] Further, the torque assembly includes a fixing bolt, a spring, a slider and a slider base. The fixing bolt is installed on the graduated disc. The fixing bolt is connected to one end of the spring through rope A, and the other end of the spring is connected to the slider through rope B. The slider base includes a bottom plate, a front side plate and a rear side plate. The bottom of the slider is arranged in the slideway between the bottom plate and the front side plate. The effective length of the bottom plate is the same as the exposed width of the front side plate, both of which are half of the diameter of the bottom of the slider. When the slider is subjected to a rightward pulling force, the slider can be fixed on the slider base. When the slider is subjected to a leftward pulling force, the slider automatically disengages from the slider base.

[0011] Further, the torque assembly further includes a magnetic base. The bottom plate of the magnetic base is made of a magnetic material and is designed in a V shape for fixing on the arc surface of the gas turbine casing. The magnetic base is installed below the slider base, and the relative height between the slider base and the magnetic base is adjustable.

[0012] Further, the lower parts of the front side plate and the rear side plate of the slider base are designed with hollow L-shaped channels for rope B to pass through.

[0013] A method for measuring the coast-down amount of a gas turbine rotor includes the following steps:

[0014] Step 1: Insert the gear of the rotating assembly into the turning gear hole of the gas turbine and make the gear mesh with the gas turbine gear.

[0015] Step 2: Fix the slider base so that the upper surface of the bottom plate of the slider base is at the same height as the upper surface of the graduated disc.

[0016] Step 3: Adjust rope A, the spring, rope B, the measuring line and the starting line to be in the same straight line, and ensure that the front side plate of the slider base is perpendicular to rope B. At this time, the slider is only subjected to the forward pulling force of rope B, and the slider is fixed on the slider base.

[0017] Step 4: Rotate the graduated disc to a certain angle by an external force. After removing the external force, the graduated disc starts to rotate back under the pulling force of the spring. When the starting line rotates back to the measuring line position, the force on the slider changes from the pulling force on the right front side to the pulling force on the left front side, and the slider automatically disengages from the slider base, causing the torque applied to the graduated disc to disappear instantly. The graduated disc continues to rotate driven by the rotational inertia of the gas turbine.

[0018] Step 5: When the graduated disc stops rotating, obtain the coast-down amount of the gas turbine rotor by measuring the relative position between the measuring line on the measuring sleeve and the starting line on the graduated disc.

[0019] The beneficial effects of the present invention are as follows:

[0020] In the present invention, the gear of the rotating assembly meshes with the gear of the gas turbine rotor, connecting the rotating assembly to the gas turbine rotor; a fixed torque is applied to the rotating assembly through the torque assembly to drive the rotation of the gas turbine rotor; the coast-down amount of the gas turbine rotor is measured through the measuring assembly. In the present invention, the position of the torque assembly relative to the rotating assembly is accurately controllable. When the rotating assembly rotates a fixed angle under the action of the torque, the torque can be automatically withdrawn. The torque applied to the gas turbine rotor in the present invention is accurately controllable. After applying an accurate torque to the gas turbine rotor in the present invention, the coast-down amount of the gas turbine rotor under the action of the torque can be accurately measured, and the problem of quantitatively evaluating the rotating state of the gas turbine rotor can be solved. Description of the Drawings

[0021] Figure 1 It is a schematic structural view of a device for measuring the coast-down amount of a gas turbine rotor in the present invention.

[0022] Figure 2 It is a top view of the graduated disc in the present invention.

[0023] Figure 3 It is an assembled sectional view of the rotating assembly in the present invention.

[0024] Figure 4 It is an assembled side view of the magnetic base and the slider base in the present invention.

[0025] Figure 5 It is a front view of the slider in the present invention. Detailed Embodiments

[0026] The present invention will be further described below with reference to the drawings.

[0027] The present invention designs a device for measuring the coasting quantity of a gas turbine rotor, which includes a rotating assembly, a torque assembly, and a measuring assembly. The turning gear device is connected to the gas turbine rotor through the rotating assembly, and a fixed torque is applied to the turning gear device through the torque assembly. Under the action of the torque, the gas turbine rotor starts to rotate. When it rotates to a fixed angle, the torque is automatically withdrawn, and the gas turbine rotor starts to coast. After the coasting ends, the coasting quantity of the gas turbine rotor can be accurately measured through the measuring assembly. The structure of the present invention is simple, the operation is convenient, and the measurement is accurate. By accurately measuring the coasting quantity of the gas turbine rotor, the rotation state of the gas turbine rotor can be quantitatively evaluated.

[0028] Embodiment 1:

[0029] As Figure 1 , Figure 2 , Figure 3 , the rotating assembly includes a sleeve 10, a rotating rod 11, and a gear 12. The gear 12 is designed according to the specifications of the turning gear reserved for the gas turbine rotor, and the gear 12 is connected to the rotating rod 11 by welding. The measuring assembly includes a graduated disc 1; the upper part of the rotating rod 11 is connected to the center of the graduated disc 1; the sleeve 10 is a hollow cylinder, and the whole sleeve 10 is sleeved outside the rotating rod 11 to ensure that the position of the sleeve 10 remains fixed when the rotating rod 11 rotates; there are scale lines and a starting line 14 on the graduated disc 1, and a threaded hole is designed outside the starting line 14 for installing a fixing bolt 2; by aligning the hemp rope A (3) with the starting line 14 and keeping the hemp rope B (5) perpendicular to the front side plate 15 of the slider base, the positions of the rotating assembly and the torque assembly can be fixed, so as to ensure that the applied torque is accurately controllable; a measuring line 13 parallel to the axis of the sleeve 10 is designed on the upper surface of the sleeve 10; after the coasting of the gas turbine rotor ends, the coasting quantity of the gas turbine rotor can be obtained by measuring the relative position between the measuring line 13 on the sleeve 10 and the starting line 14 on the graduated disc 1.

[0030] Embodiment 2:

[0031] The rotating rod 11 adopts a five-section design. The first section from bottom to top is designed as a thin cylinder, the second section is designed as a spherical shape, the third section is designed as a thick cylinder, the fourth section is designed as a spherical shape, and the fifth section is designed as a thick cylinder. The five sections are connected by welding. The sleeve 10 is designed as a hollow cylinder. A round hole is designed on the upper surface of the sleeve 10, and the center of the round hole coincides with the center of the sleeve 10. The diameter of the round hole is slightly larger than the diameter of the thick cylinder of the fifth section of the rotating rod 11 and smaller than the diameter of the spherical shape of the fourth section of the rotating rod 11; a round hole is designed on the lower surface of the sleeve 10, and the center of the round hole coincides with the center of the sleeve 10. The diameter of the round hole is slightly larger than the diameter of the thin cylinder of the first section of the rotating rod 11 and smaller than the diameter of the spherical shape of the second section of the rotating rod 11; this design can ensure that the position of the sleeve 10 remains fixed when the rotating rod 11 rotates.

[0032] Embodiment 3:

[0033] A graduated disc 1 is designed with a hexagonal cylinder. At the start of measurement, after using a wrench to rotate the hexagonal cylinder on the graduated disc 1 counterclockwise by a certain angle, the wrench is removed. Under the action of a spring 4, the graduated disc 1 starts to rotate back.

[0034] Example 4:

[0035] As Figure 1 、 Figure 4 shown, the torque assembly includes a fixing bolt 2, a hemp rope A (3), a spring 4, a hemp rope B (5), a slider 6, a slider base, a magnetic base, and a bolt and nut 9; the upper part of the slider base is composed of a base plate 7 and two adjacent side plates: a front side plate 15 and a rear side plate 16; the effective length of the base plate 7 of the slider base is the same as the exposed width of the front side plate 15 of the slider base, both being half of the bottom diameter of the slider 6. Therefore, when the slider 6 is subjected to a right - hand pull, the slider 6 can be fixed on the slider base, and when the slider 6 is subjected to a left - hand pull, the slider 6 automatically disengages from the slider base. During measurement, when the graduated disc 1 rotates under the action of the spring and its starting line 14 rotates to the measurement line 13 position, the pull force on the slider 6 changes from the right front to the left front, and the slider 6 can disengage from the slider base by itself, causing the torque applied to the graduated disc 1 to disappear instantly.

[0036] Example 5:

[0037] The magnetic base is composed of a magnetic base plate 8 and a rectangular cylinder 17. The magnetic base plate 8 is made of a magnetic material and has a V - shaped design, which can effectively fix the magnetic base on the curved surface of the gas turbine casing; a rectangular cylinder 17 is designed on the upper part of the magnetic base, and a rectangular cylinder 18 is designed on the lower part of the slider base. The two rectangular cylinders have a hollow design in the middle and are fixedly connected at the hollow part through two sets of bolt and nut 9. This design can adjust the relative height between the slider base and the magnetic base within a certain range.

[0038] Example 6:

[0039] The lower parts of the front side plate 15 and the rear side plate 16 of the slider base are designed with hollow L - shaped channels to facilitate the free passage of the hemp rope.

[0040] Example 7:

[0041] During measurement, first insert the gear 12 of the rotating assembly into the turning hole of the gas turbine, and mesh the gear 12 with the gas turbine gear; install the torque assembly. First, fix the magnetic base on the arc-shaped casing of the gas turbine through the magnetic base bottom plate 8. Install the slider base. Move the slider base up and down. When the upper surface of the slider base bottom plate 7 is at the same height as the upper surface of the graduated disk 1, tighten the bolt and nut 9 to fix the slider base; connect one side of the fixing bolt 2 and the spring 4 with the hemp rope A (3), and connect the slider 6 and the other side of the spring 4 with the hemp rope B (5); rotate and fix the fixing bolt 2 into the threaded hole on the graduated disk 1, and place the slider 6 on the slider base bottom plate 7. By rotating the graduated disk 1, the sleeve 10, and by moving and rotating the magnetic base, make the spring 4 in a certain stretched state, and make the hemp rope A (3), the spring 4, the hemp rope B (5), the measuring line 13, and the starting line 14 in the same straight line, and ensure that the front side plate 15 of the slider base is perpendicular to the hemp rope B (5). At this time, the slider 6 only receives the forward tension of the hemp rope B (5), and does not receive the left and right side tensions of the hemp rope B (5). Use a wrench to rotate the hexagonal cylinder on the graduated disk 1 counterclockwise to a certain angle, release the wrench, and the graduated disk 1 starts to rotate back under the tension of the spring 4. When the starting line 14 rotates back to the position of the measuring line 13, the force on the slider 6 changes from the right front side tension to the left front side tension, the slider 6 disengages from the slider base, the torque applied to the graduated disk 1 disappears, and the graduated disk 1 continues to rotate under the driving of the rotational inertia of the gas turbine. When the graduated disk 1 stops rotating, by measuring the relative position between the starting line 14 and the measuring line 13 on the graduated disk 1, the coasting angle of the gas turbine can be obtained.

[0042] After all the torque assembly, the rotating assembly, and the measuring assembly of the present invention are installed, the stretching amount of the spring 4 in the torque assembly and the torsional amount of the graduated disk 1 are controllable. And when the graduated disk 1 rotates back to the position of the measuring line 13, the torque automatically disappears, which can ensure that the torque applied by the torque assembly to the gas turbine rotor is accurate and controllable. Also, because the coasting amount of the gas turbine measured by the measuring assembly is accurate and reliable, the present invention can accurately evaluate the rotating state of the gas turbine rotor.

[0043] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for measuring the coast-down amount of a gas turbine rotor, characterized in that: It includes a rotating assembly, a torque assembly and a measuring assembly; the rotating assembly is used to connect with the gas turbine rotor; the torque assembly is used to apply a fixed torque. Under the action of the torque, the gas turbine rotor starts to rotate. When it rotates to a fixed angle, the torque is automatically withdrawn, and the gas turbine rotor starts to coast. After the coasting ends, the coasting amount of the gas turbine rotor is measured by the measuring assembly. The rotating assembly includes a sleeve (10), a rotating rod (11) and a gear (12); the measuring assembly includes a graduated disc (1); the gear (12) is installed at the bottom of the rotating rod (11) and is used to connect with the gas turbine rotor; the upper part of the rotating rod (11) is connected to the center of the graduated disc (1); the sleeve (10) is a hollow cylinder, and the whole sleeve (10) is sleeved outside the rotating rod (11) to ensure that the position of the sleeve (10) remains fixed when the rotating rod (11) rotates; there are scale lines and a starting line (14) on the graduated disc (1); a measuring line (13) parallel to the axis of the sleeve (10) is designed on the upper surface of the sleeve (10); after the coasting of the gas turbine rotor ends, the coasting amount of the gas turbine rotor is obtained by measuring the relative position between the measuring line (13) on the sleeve (10) and the starting line (14) on the graduated disc (1). The rotating rod (11) adopts a five-section design. The first section from bottom to top adopts a thin cylinder design, the second section adopts a spherical design, the third section adopts a thick cylinder design, the fourth section adopts a spherical design, and the fifth section adopts a thick cylinder design; a first round hole is opened at the center of the upper surface of the sleeve (10), and the diameter of the first round hole is larger than the diameter of the thick cylinder of the fifth section of the rotating rod (11) and smaller than the diameter of the spherical shape of the fourth section of the rotating rod (11); a second round hole is opened at the center of the lower surface of the sleeve (10), and the diameter of the second round hole is larger than the diameter of the thin cylinder of the first section of the rotating rod (11) and smaller than the diameter of the spherical shape of the second section of the rotating rod (11). The torque assembly includes a fixing bolt (2), a spring (4), a slider (6) and a slider base; the fixing bolt (2) is installed on the graduated disc (1), and the fixing bolt (2) is connected to one end of the spring (4) through a rope A (3), and the other end of the spring (4) is connected to the slider (6) through a rope B (5); the slider base includes a bottom plate (7), a front side plate (15) and a rear side plate (16); the bottom of the slider (6) is arranged in the slideway between the bottom plate (7) and the front side plate (15); the effective length of the bottom plate (7) is the same as the exposed width of the front side plate (15), both of which are half of the bottom diameter of the slider (6); when the slider (6) is subjected to a rightward pulling force, the slider (6) can be fixed on the slider base, and when the slider (6) is subjected to a leftward pulling force, the slider (6) automatically disengages from the slider base.

2. The device for measuring the coast-down amount of a gas turbine rotor according to claim 1, wherein: A hexagonal cylinder is provided at the center of the upper surface of the graduated disc (1), and the graduated disc (1) is rotated by turning the hexagonal cylinder with a wrench.

3. A device for measuring the coast-down amount of a gas turbine rotor according to claim 1, characterized in that: The torque assembly further includes a magnetic base; the bottom plate (8) of the magnetic base is made of magnetic material and is designed in a V shape for fixing on the arc surface of the gas turbine casing; the magnetic base is installed under the slider base, and the relative height between the slider base and the magnetic base is adjustable.

4. A device for measuring the coast-down amount of a gas turbine rotor according to claim 1, characterized in that: The lower parts of the front side plate (15) and the rear side plate (16) of the slider base are designed with hollow L-shaped channels for the rope B (5) to pass through.

5. A method for measuring the coast-down amount of a gas turbine rotor of the device for measuring the coast-down amount of a gas turbine rotor according to claim 3, characterized in that, It includes the following steps: Step 1: Insert the gear (12) of the rotating assembly into the turning hole of the gas turbine and make the gear (12) mesh with the gas turbine gear. Step 2: Fix the slider base so that the upper surface of the bottom plate (7) of the slider base is at the same height as the upper surface of the graduated disc (1). Step 3: Adjust the rope A (3), the spring (4), the rope B (5), the measuring line (13) and the starting line (14) to be in the same straight line, and ensure that the front side plate (15) of the slider base is perpendicular to the rope B (5). At this time, the slider (6) is only subjected to the positive pulling force of the rope B (5), and the slider (6) is fixed on the slider base. Step 4: Rotate the graduated disc (1) to a certain angle by an external force. After removing the external force, the graduated disc (1) starts to rotate back under the pulling force of the spring (4). When the starting line (14) rotates back to the position of the measuring line (13), the force on the slider (6) changes from the right front pulling force to the left front pulling force, and the slider (6) automatically disengages from the slider base, causing the torque applied to the graduated disc (1) to disappear instantly. The graduated disc (1) continues to rotate under the rotational inertia of the gas turbine. Step 5: When the graduated disc (1) stops rotating, obtain the coast-down amount of the gas turbine rotor by measuring the relative position between the measuring line (13) on the measuring sleeve (10) and the starting line (14) on the graduated disc (1).

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