A tool for measuring the flow clearance of steam turbine cylinders in thermal power plants

Abstract

The present invention relates to the technical field of measuring tools, and specifically to a tool for measuring the flow clearance of a cylinder of a steam turbine in a thermal power plant. The tool comprises a measuring pen, wherein the measuring pen is connected with an initial measurement component and an actual measurement component, wherein the initial measurement component comprises a wedge-shaped measuring platform, wherein the measuring platform is used to extend into the flow clearance and preliminarily measure the width of the flow clearance, and the actual measurement component comprises a detection rod and a detection component, wherein the detection rod is connected with the detection component, and an arc-shaped detection plate is connected with the length direction of the detection rod, and when the blade contacts the detection plate, the cylinder blade pushes the detection plate to rotate. When the detection plate rotates, different rotation angles correspond to different flow clearance distances, and efficient measurement of the flow clearance is achieved according to the different rotation angles measured by the detection component, and the present application can be applied to the measurement of flow clearances of different sizes, and is convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of measuring tools, in particular to a tool for measuring the flow clearance of a steam turbine cylinder in a thermal power plant. Background Art

[0002] The steam turbine cylinder is the outer shell of the steam turbine. The steam turbine is one of the three main equipment in a thermal power plant. Its blades and cylinders have very high processing precision, and the main components work in a high temperature and high pressure environment. Due to the huge harm caused by water ingress into the steam turbine cylinder, the relevant accident investigation regulations stipulate that the above-mentioned faults caused by water ingress into large steam turbine units are all classified as major equipment accidents. When repairing the steam turbine, when the gap between the moving and static parts in the cylinder changes greatly and there is a moving and static contact, it may cause the cranking to fail to start normally. In addition, the steam turbine blades have many stages of blades, which requires measuring the steam seal gap between the blades and the cylinder. The general measurement is to stick multiple layers of tape on the cylinder steam seal, then rotate the blades, and observe how many layers of tape are left after the blades are lifted up, so as to judge the gap between the blades and the bottom of the cylinder.

[0003] However, since the operation of sticking the tape is inconvenient, and the tape itself has a certain elasticity, it will affect the measurement accuracy during the actual detection process. Therefore, the present application provides a thermal power plant steam turbine cylinder flow measurement tool to solve the problem that the measurement tool in the prior art is inconvenient to stick and use, and the measurement of the gas seal gap is inaccurate. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a tool for measuring the flow clearance of a steam turbine cylinder in a thermal power plant.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a tool for measuring the flow clearance of a turbine cylinder in a thermal power plant, comprising a measuring pen, wherein the measuring pen is connected to an initial measurement component and an actual measurement component, wherein the initial measurement component comprises a wedge-shaped measuring platform, wherein the measuring platform is used to extend into the flow clearance and preliminarily measure the width of the flow clearance, and the actual measurement component comprises a detection rod and a detection component, wherein the detection rod is connected to the detection component, and an arc-shaped detection plate is connected to the length direction of the detection rod, and when the blade contacts the detection plate, the cylinder blade pushes the detection plate to rotate.

[0006] As an optimization, two connecting seats are provided at one end of the measuring pen, a mounting plate is provided between the two connecting seats, the mounting plate is provided with a supporting spring, the detection component is fixedly connected to the supporting spring, the length direction of the detection rod is parallel to the length direction of the connecting seat, and when the detection rod extends into the flow gap, the connecting seat is clamped on the outside of the cylinder.

[0007] As an optimization, the detection assembly includes a servo motor, the output shaft of the servo motor is provided with an angle sensor, and the detection rod is connected to the output shaft of the servo motor;

[0008] A plurality of positioning magnets are evenly distributed along the length direction of the detection rod, and the detection rod can be magnetically attracted to the inner wall of the cylinder through the positioning magnets.

[0009] As an optimization, the thickness of the measuring platform gradually decreases in the direction away from the measuring pen, and the inclined surface of the measuring platform is concave to form a receiving groove, and the interior of the receiving groove is filled with measuring mud;

[0010] A telescopic rod is provided at one end of the measuring platform close to the measuring pen, and a push plate is connected to the extended end of the telescopic rod. The bottom surface of the push plate contacts the bottom surface of the receiving groove, and the push plate is pressed tightly against the measuring mud. When the telescopic rod is extended, the push plate pushes the measuring mud to move away from the measuring pen, and the top of the measuring mud is higher than the top of the receiving groove.

[0011] As an optimization, the inclined surface of the measuring platform is marked with a minimum detection line and a maximum detection line. When the measuring platform extends into the flow gap, the blade contacts the measuring mud to form an initial measurement mark. When the initial measurement mark is between the minimum detection line and the maximum detection line, further detection can be performed through the actual measurement component.

[0012] As an optimization, when the detection rod is in contact with the inner side of the cylinder and the detection plate is in contact with the inner side of the cylinder, the angle sensor measurement value is 0°, and the corresponding flow gap thickness is the width of the detection plate.

[0013] As an optimization, a controller and a power supply are provided inside the measuring pen, the controller is used to execute commands to the initial measurement component and the actual measurement component, and the power supply is used to supply power to the initial measurement component, the actual measurement component and the controller.

[0014] The beneficial effects of this program are as follows:

[0015] The measuring pen of the present application can perform an initial measurement of the flow gap through the initial measurement component. When it is determined that the actual measurement component can be used for detection, the actual measurement component is installed in the flow gap. When the detection plate rotates, different rotation angles correspond to different flow gap distances. According to the different rotation angles measured by the detection component, efficient measurement of the flow gap is achieved. In addition, the present application can be applicable to the measurement of flow gaps of different sizes and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the steam turbine blade of the present invention.

[0017] Figure 2 It is a schematic diagram of the axial side of the present invention.

[0018] Figure 3 It is a schematic diagram of the back axial side of the present invention.

[0019] Figure 4 It is a main schematic diagram of the present invention.

[0020] Figure 5 This is a schematic axial view of the initial measurement assembly of the present invention.

[0021] Figure 6 It is a schematic axial view of the measured component of the present invention.

[0022] Figure 7 It is a schematic diagram of the application status of the measured components of the present invention.

[0023] Among them, 1. measuring pen, 2. measuring table, 3. detection rod, 4. detection plate, 5. blade, 6. connecting seat, 7. mounting plate, 8. support spring, 9. servo motor, 10. angle sensor, 11. positioning magnet, 12. measuring mud, 13. telescopic rod, 14. push plate, 15. lowest detection line, 16. highest detection line. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] like Figure 1-7 As shown, a tool for measuring the flow clearance of a turbine cylinder in a thermal power plant comprises a measuring pen 1, wherein the measuring pen 1 is connected with an initial measurement component and an actual measurement component, wherein the initial measurement component comprises a wedge-shaped measuring platform 2, wherein the measuring platform 2 is used to extend into the flow clearance to preliminarily measure the width of the flow clearance, and wherein the actual measurement component comprises a detection rod 3 and a detection component, wherein the detection rod 3 is connected with the detection component, and an arc-shaped detection plate 4 is connected in the length direction of the detection rod 3, and when the blade 5 contacts the detection plate 4, the cylinder blade 5 pushes the detection plate 4 to rotate.

[0026] The thickness of the detection rod 3 and the detection plate 4 are both smaller than the allowable flow gap size, and the setting of the detection rod 3 does not affect the rotation of the blade 5. When the detection plate 4 is in contact with the inner wall of the cylinder, the thickness is n.

[0027] like Figure 6As shown, two connecting seats 6 are provided at one end of the measuring pen 1, a mounting plate 7 is provided between the two connecting seats 6, the mounting plate 7 is provided with a supporting spring 8, the detection component is fixedly connected to the supporting spring 8, the length direction of the detection rod 3 is parallel to the length direction of the connecting seat 6, and when the detection rod 3 extends into the flow gap, the connecting seat 6 is clamped on the outside of the cylinder.

[0028] The outer end of the support spring 8 is provided with a connection block, and the detection assembly is connected to the connection block. The support spring 8 is used to connect and support the detection assembly, so that the detection assembly can swing within a certain range, ensuring that the detection rod 3 can be set along the inner wall of the cylinder, and avoiding unevenness at both ends of the detection rod 3 during operation.

[0029] like Figure 6 As shown, the detection assembly includes a servo motor 9, the output shaft of the servo motor 9 is provided with an angle sensor 10, and the detection rod 3 is connected to the output shaft of the servo motor 9;

[0030] A plurality of positioning magnets 11 are evenly distributed along the length direction of the detection rod 3 , and the detection rod 3 can be magnetically attracted to the inner wall of the cylinder through the positioning magnets 11 .

[0031] The positioning magnet 11 can be magnetically attracted to the inner wall of the cylinder, so that the detection rod 3 is fitted and fixed along the axial direction of the turbine, thereby improving the accuracy of detection.

[0032] like Figure 2 and Figure 5 As shown, the thickness of the measuring platform 2 gradually decreases in the direction away from the measuring pen 1, and the inclined surface of the measuring platform 2 is concave to form a receiving groove, and the interior of the receiving groove is filled with measuring mud 12;

[0033] A telescopic rod 13 is provided at one end of the measuring table 2 close to the measuring pen 1, and a push plate 14 is connected to the extended end of the telescopic rod 13. The bottom surface of the push plate 14 contacts the bottom surface of the receiving groove, and the push plate 14 is pressed tightly against the measuring mud 12. When the telescopic rod 13 is extended, the push plate 14 pushes the measuring mud 12 to move away from the measuring pen 1, and the top of the measuring mud 12 is higher than the top of the receiving groove.

[0034] The measuring mud 12 is solid and can produce a certain deformation when subjected to force. When the blade 5 passes through the measuring mud 12, a mark will be formed on the upper part of the measuring mud 12.

[0035] like Figure 1 and Figure 5 As shown, the inclined surface of the measuring platform 2 is marked with a lowest detection line 15 and a highest detection line 16. When the measuring platform 2 extends into the flow gap, the blade 5 contacts the measuring mud 12 to form an initial measurement mark. When the initial measurement mark is between the lowest detection line 15 and the highest detection line 16, further detection can be performed through the actual measurement component.

[0036] When the initial test mark is lower than the minimum test line 15, the surface flow clearance is within the qualified range. When the flow clearance is greater than the maximum test line 16, the cylinder needs to be inspected and repaired, which is set according to actual work needs.

[0037] like Figure 7 As shown, when the detection rod 3 and the detection plate 4 are in contact with the inner side of the cylinder, the angle sensor 10 measures a value of 0°, and the corresponding flow gap thickness is the width of the detection plate 4 .

[0038] When the detection plate 4 is located at position c, the detection angle of the angle sensor 10 is 0°. When the detection plate 4 is detected inside the flow gap, the detection plate 4 is located at position a. At this time, the angle between the detection plate 4 and the angle sensor 10 is d. When the detection plate 4 rotates from angle d to 0°, the shortest distance between the outer end of the detection plate 4 and the inner wall of the cylinder is a measurable value.

[0039] Therefore, when the blade 5 passes through the detection plate 4, it pushes the detection plate 4 to move from position a to position b, and the flow gap is the distance between the outer end of the detection plate 4 at position b and the inner wall of the cylinder.

[0040] The measuring pen 1 is internally provided with a controller and a power supply. The controller is used to execute commands to the initial measuring component and the actual measuring component, and the power supply is used to supply power to the initial measuring component, the actual measuring component and the controller.

[0041] Directions:

[0042] When the device is used, the measuring platform 2 is first inserted into the flow gap so that the measuring mud 12 faces the outer edge of the blade 5;

[0043] After the cylinder is running, the blade 5 will leave an initial measurement mark on the measuring table 2. When the initial measurement mark is between the highest detection line 16 and the lowest detection line 15, the flow clearance size is further tested by the actual measurement component;

[0044] When the measuring assembly is in operation, firstly, the detection rod 3 is extended into the flow gap, the connecting seat 6 is clamped on the outside of the cylinder, and the detection assembly is gently shaken to make the multiple positioning magnets 11 on the detection rod 3 magnetically attracted to the inner wall of the cylinder, so that the detection rod 3 is stably set;

[0045] The servo motor 9 is turned on and self-calibrated, so that the detection plate 4 rotates until the outer end contacts the inner wall of the cylinder. At this time, the angle sensor 10 detects that the rotation angle of the detection rod 3 is 0°;

[0046] The servo motor 9 drives the detection rod 3 to rotate, so that the detection plate 4 opens toward the axis of the cylinder. At this time, the angle between the detection plate 4 and the angle sensor 10 is d;

[0047] When the blade 5 passes through the detection plate 4, the blade 5 pushes the detection plate 4 to move from position a to position b. The distance between the outer end of the detection plate 4 and the inner wall of the cylinder at position b is the flow clearance.

[0048] After the detection is completed, turn off the machine and remove the detection rod 3.

[0049] The measuring tool of the present application can be used repeatedly and can be applicable to different cylinder flow clearance detection operations. There is no need to disassemble and assemble the detection tool, etc. It is convenient and quick to use, and effectively improves the detection efficiency and detection accuracy.

[0050] The above-mentioned specific implementation is only a specific case of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific implementation. Any tool for measuring the flow clearance of a steam turbine cylinder in a thermal power plant that complies with the claims of the present invention and any appropriate changes or modifications made thereto by ordinary technicians in the corresponding technical field shall fall within the patent protection scope of the present invention.

Claims

1. A tool for measuring the flow clearance of a steam turbine cylinder in a thermal power plant, characterized in that: The measuring pen (1) is connected to a preliminary measuring component and a real measuring component. The preliminary measuring component includes a wedge-shaped measuring platform (2). The measuring platform (2) is used to extend into the flow gap to preliminarily measure the width of the flow gap. The real measuring component includes a detection rod (3) and a detection component. The detection rod (3) is connected to the detection component. A circular arc-shaped detection plate (4) is connected to the length direction of the detection rod (3). When a blade (5) contacts the detection plate (4), the cylinder blade (5) pushes the detection plate (4) to rotate. The detection assembly comprises a servo motor (9), the output shaft of the servo motor (9) is provided with an angle sensor (10), and the detection rod (3) is connected to the output shaft of the servo motor (9); A plurality of positioning magnets (11) are evenly distributed along the length direction of the detection rod (3), and the detection rod (3) can be magnetically attracted to the inner wall of the cylinder through the positioning magnets (11); The thickness of the measuring platform (2) gradually decreases in a direction away from the measuring pen (1); the inclined surface of the measuring platform (2) is concave to form a receiving groove, and the interior of the receiving groove is filled with measuring mud (12); A telescopic rod (13) is provided at one end of the measuring platform (2) close to the measuring pen (1), and a push plate (14) is connected to the extended end of the telescopic rod (13). The bottom surface of the push plate (14) contacts the bottom surface of the receiving groove, and the push plate (14) is pressed against the measuring mud (12). When the telescopic rod (13) is extended, the push plate (14) pushes the measuring mud (12) to move in a direction away from the measuring pen (1), and the top of the measuring mud (12) is higher than the top of the receiving groove.

2. A thermal power plant steam turbine cylinder flow clearance measuring tool according to claim 1, characterized in that: One end of the measuring pen (1) is provided with two connecting seats (6), a mounting plate (7) is provided between the two connecting seats (6), the mounting plate (7) is provided with a supporting spring (8), the detection component is fixedly connected to the supporting spring (8), the length direction of the detection rod (3) is parallel to the length direction of the connecting seat (6), and when the detection rod (3) extends into the flow gap, the connecting seat (6) is clamped on the outside of the cylinder.

3. A thermal power plant steam turbine cylinder flow clearance measuring tool according to claim 1, characterized in that: The inclined surface of the measuring platform (2) is marked with a lowest detection line (15) and a highest detection line (16). When the measuring platform (2) extends into the flow gap, the blade (5) contacts the measuring mud (12) to form an initial detection mark. When the initial detection mark is located between the lowest detection line (15) and the highest detection line (16), further detection can be performed through the actual measurement component.

4. A thermal power plant steam turbine cylinder flow clearance measuring tool according to claim 1, characterized in that: When the detection rod (3) is in contact with the inner side of the cylinder and the detection plate (4) is in contact with the inner side of the cylinder, the angle sensor (10) measures a value of 0°, and the corresponding flow gap thickness is the width of the detection plate (4).

5. A thermal power plant steam turbine cylinder flow clearance measuring tool according to claim 1, characterized in that: The measuring pen (1) is internally provided with a controller and a power supply, the controller is used to execute commands to the initial measuring component and the actual measuring component, and the power supply is used to supply power to the initial measuring component, the actual measuring component and the controller.

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