Through-flow gap detection device

Abstract

The invention relates to the technical field of steam turbines, and discloses a through-flow gap detection device, and the device comprises an installation seat which is provided with a first installation position, a second installation position, and a third installation position; the first clamping assembly is arranged at the first mounting position and provided with a first clamping part, the first clamping part is arranged in the circumferential direction of the middle shaft, the second clamping assembly is arranged at the second mounting position and provided with a second clamping part, and the second clamping part is arranged in the circumferential direction of the inner wall of the air cylinder; the first clamping assembly and the second clamping assembly are arranged on the mounting base, when the first clamping assembly clamps the middle shaft, the circle center of the detection device is overlapped with the circle center of the middle shaft, the distance measuring assembly detects a primary gap value at the moment, and when the second clamping assembly clamps the inner wall of the air cylinder, the circle center of the detection device is overlapped with the circle center of the air cylinder; at the moment, the distance measuring assembly detects a secondary clearance value, and by neutralizing the primary clearance value and the secondary clearance value, the measurement error caused when the center shaft and the air cylinder are not concentric can be effectively eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and particularly to a through-flow clearance detection device. Background Art

[0002] During the operation of a steam turbine, due to factors such as temperature, pressure, and vibration, the through-flow clearance may change. To ensure the stable and reliable operation of the steam turbine, it is necessary to regularly detect the through-flow clearance using a clearance measurement tool, so as to timely understand the change of the clearance and evaluate the operating state of the steam turbine. When an abnormality in the through-flow clearance is found, the equipment failure can be predicted in advance, providing a basis for maintenance decisions and avoiding the further expansion of the failure.

[0003] Currently, when using existing through-flow clearance detection equipment, when there is a non-concentric situation between the central axis of the steam turbine and the cylinder itself, the measured clearance value between the impeller and the inner wall of the cylinder will be greatly affected, and it cannot accurately reflect the true through-flow clearance, resulting in a large deviation in the measurement result. Summary of the Invention

[0004] In view of this, the present invention provides a through-flow clearance detection device to solve the problem of large detection deviation in the existing through-flow clearance detection method.

[0005] In a first aspect, the present invention provides a through-flow clearance detection device for detecting the through-flow clearance of a steam turbine. The steam turbine includes a cylinder and a central axis rotatably arranged in the cylinder. The through-flow clearance detection device includes:

[0006] A mounting seat adapted to be arranged in the cylinder. The mounting seat has a first mounting position, a second mounting position, and a third mounting position. The first mounting position is arranged close to the central axis, the second mounting position is on the side of the first mounting position away from the central axis, and the third mounting position is arranged close to the inner wall of the cylinder;

[0007] A first clamping assembly arranged at the first mounting position and having a first clamping part. The first clamping part is arranged along the circumferential direction of the central axis, and there is a space inside the first clamping part for placing the end of the central axis. The first clamping assembly has a first concentric state of clamping the outer wall of the central axis and a first separated state of separating from the outer wall of the central axis;

[0008] A second clamping assembly arranged at the second mounting position and having a second clamping part. The second clamping part is arranged along the circumferential direction of the inner wall of the cylinder. The second clamping assembly has a second concentric state of clamping the inner wall of the cylinder and a second separated state of separating from the inner wall of the cylinder;

[0009] At least one distance measuring assembly arranged at the third mounting position.

[0010] Beneficial effects: The first clamping component and the second clamping component are respectively arranged on the mounting seat. When the first clamping component clamps the central shaft, the center of the detection device overlaps with the center of the central shaft. At this time, the distance measuring component detects a primary clearance value. After the first clamping component is separated, when the second clamping component clamps the inner wall of the cylinder, the center of the detection device overlaps with the center of the cylinder. At this time, the distance measuring component detects a secondary clearance value. By neutralizing the primary clearance value and the secondary clearance value, the measurement error caused by the non-concentricity of the central shaft and the cylinder can be effectively eliminated, making the measurement result closer to the true flow-through clearance, and effectively solving the problem of large detection deviation in the existing flow-through clearance detection method.

[0011] In an alternative embodiment, the third mounting position extends along the circumferential direction of the cylinder. The distance measuring component includes a measuring drive component and a distance measuring instrument. The distance measuring instrument is arranged on the measuring drive component, and the measuring drive component is movably arranged along the circumferential direction on the third mounting position.

[0012] Beneficial effects: Through this form of distance measuring component, the distance measuring instrument can realize continuous circumferential detection, improving the detection accuracy and reliability.

[0013] In an alternative embodiment, the measuring drive component includes a first driving motor and a moving ring. The moving ring is rotatably arranged on the third mounting position. The distance measuring instrument is arranged on the moving ring. The first driving motor is fixedly arranged on the mounting seat. A driving gear is arranged on the driving shaft of the first driving motor. A mating tooth for driving gear transmission cooperation is arranged on the inner ring of the moving ring. The first driving motor drives the moving ring to rotate through the driving gear.

[0014] Beneficial effects: The structure of the measuring drive component is simple and reliable, and the weight distribution is relatively uniform. It can realize continuous detection in the circumferential direction and detection at any position, effectively improving the detection flexibility.

[0015] In an alternative embodiment, the mounting seat includes a first seat body and a second seat body. The first seat body is arranged close to the central shaft. The second seat body is arranged on the side of the first seat body away from the central shaft and is connected to the first seat body. The first seat body has a first mounting position and a third mounting position, and the second seat body has a second mounting position;

[0016] The first clamping component includes a first driving member and a plurality of clamping structures. The plurality of clamping structures are arranged at intervals along the circumferential direction. Each clamping structure is movably arranged along the radial direction on the first mounting position. The first driving member simultaneously drives the plurality of clamping structures to move inward along the radial direction.

[0017] Beneficial effects: The structure of the first clamping component is simple and reliable. By moving the plurality of clamping structures together, the mounting seat can be fixed to the central shaft and kept in a concentric state.

[0018] In an optional embodiment, a plurality of clamping structures are arranged at equal intervals, each clamping structure is provided with two first through-holes, the first clamping assembly further comprises a plurality of first linkage rods, the first linkage rods are passed through the first through-holes of adjacent clamping structures, the first linkage rods and the clamping structures are alternately arranged, the plurality of first linkage rods are arranged in the form of a regular polygon, and the first driving member is connected to at least one of the first linkage rods to drive the first linkage rod to move radially.

[0019] Beneficial effect: With this type of structure, the clamping structures can be linked and moved together, which can not only achieve simultaneous and equal-distance movement of multiple clamping structures, but also make the movement process of the clamping structures more stable and reliable.

[0020] In an optional embodiment, the first mounting position is provided with a plurality of strip holes extending in the radial direction, the clamping structure is passed through the corresponding strip holes, and the portion of the clamping structure passing through the strip holes in the direction close to the central axis is the first clamping portion;

[0021] The first linkage rod is located on the side of the first seat body away from the central axis. The number of the first linkage rods and the clamping structure is consistent and both are even numbers. The first driving member is a double-headed motor. The first driving member is provided with first rotating shafts on both sides along the radial direction. The two first rotating shafts both have external threads. Threaded holes are provided on the two first linkage rods arranged opposite to each other, and the two first rotating shafts are matched with the corresponding threaded holes for transmission.

[0022] Beneficial effect: This driving form is more stable and reliable. The two first rotating shafts simultaneously drive the first linkage rods arranged opposite to each other to move simultaneously. Compared with driving only one first linkage rod, this is more stable and reliable, and can disperse the force of a single first linkage rod, making the device more stable and durable.

[0023] In an optional embodiment, the second clamping assembly includes a second driving member and multiple support structures, the multiple support structures are arranged at intervals along the circumference, each support structure is radially movable in a second mounting position, and the second driving member simultaneously drives the multiple support structures to move radially outward.

[0024] Beneficial effects: The second clamping assembly has a simple and reliable structure, and the mounting seat and the cylinder can be fixed and kept in a concentric state by moving a plurality of supporting structures together.

[0025] In an optional embodiment, a plurality of support structures are arranged at equal intervals, each support structure is provided with two second through holes, the second clamping assembly further includes a plurality of second linkage rods, the second linkage rods are passed through the second through holes of adjacent support structures, the second linkage rods and the support structures are alternately arranged, the plurality of second linkage rods are arranged in the form of a regular polygon, and the second driving member is connected to two of the second linkage rods to drive the second linkage rods to move radially.

[0026] Beneficial effect: With this type of structure, the supporting structures can be linked and moved together, which can not only realize the simultaneous and equidistant movement of multiple supporting structures, but also make the movement process of the supporting structures more stable and reliable.

[0027] In an optional embodiment, the second linkage rod is located on the side of the second base body away from the first base body, the number of second linkage rods and supporting structures is consistent and both are even numbers, the second driving member is a double-headed motor, and the second driving member is provided with second rotating shafts on both sides along the radial direction, and the two second rotating shafts both have external threads, and threaded holes are provided on the two second linkage rods arranged opposite to each other, and the two second rotating shafts are matched with the corresponding threaded holes for transmission.

[0028] Beneficial effect: This driving form is more stable and reliable. The two second rotating shafts simultaneously drive the second linkage rods arranged opposite to each other to move simultaneously. Compared with driving only one second linkage rod, this is more stable and reliable, and can disperse the force of a single second linkage rod, making the device more stable and durable.

[0029] In an optional embodiment, the first clamping assembly further includes a first arc plate provided on each clamping structure, the first arc plate having a first clamping surface; and / or, the second clamping assembly further includes a second arc plate provided on each supporting structure, the second arc plate having a second clamping surface.

[0030] Beneficial effect: The arc-shaped clamping surface can more reliably make the clamping assembly fit the arc surface of the corresponding component, and can make the concentric process more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A three-dimensional schematic diagram of a flow gap detection device according to an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A cutaway schematic diagram of a flow gap detection device shown;

[0034] Figure 3 for Figure 2 An enlarged schematic diagram of the through-flow gap detection device at point A shown;

[0035] Figure 4 for Figure 1 A schematic diagram of the arrangement of the first clamping assembly of the through-flow gap detection device shown;

[0036] Figure 5 For Figure 1 The three-dimensional schematic diagram of the flow-through gap detection device shown when the second seat body and the second clamping assembly are not shown.

[0037] Description of the reference numerals:

[0038] 1. Mounting seat; 101. First seat body; 1011. Bar-shaped hole; 102. Second seat body; 1021. Guide seat;

[0039] 2. First clamping assembly; 201. First driving member; 2011. First rotating shaft; 202. Clamping structure; 2021. First through hole; 2022. Guide hole; 203. First linkage rod; 204. Guide rod; 205. First arc plate;

[0040] 3. Second clamping assembly; 301. Second driving member; 3011. Second rotating shaft; 302. Support structure; 3021. Second through hole; 303. Second linkage rod; 304. Second arc plate;

[0041] 4. Distance measuring assembly; 401. Rangefinder; 402. First driving motor; 403. Moving ring; 404. Driving gear;

[0042] 5. Cylinder; 6. Central shaft; 7. Impeller; 8. Support frame. Detailed implementation manners

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Next, in combination with Figures 1 to 5 , the embodiments of the present invention will be described.

[0045] According to an embodiment of the present invention, on the one hand, a flow-through gap detection device is provided for detecting the flow-through gap of a steam turbine. The steam turbine includes a cylinder 5 and a central shaft 6 rotatably disposed in the cylinder 5. The flow-through gap detection device includes:

[0046] A mounting seat 1 adapted to be disposed in the cylinder 5. The mounting seat 1 has a first mounting position, a second mounting position, and a third mounting position. The first mounting position is disposed close to the central shaft 6, the second mounting position is on the side of the first mounting position away from the central shaft 6, and the third mounting position is disposed close to the inner wall of the cylinder 5;

[0047] The first clamping assembly 2 is arranged at the first installation position and has a first clamping part. The first clamping part is arranged along the circumferential direction of the central axis 6. There is a space inside the first clamping part for placing the end of the central axis 6. The first clamping assembly 2 has a first concentric state of clamping the outer wall of the central axis 6 and a first separated state of separating from the outer wall of the central axis 6;

[0048] The second clamping assembly 3 is arranged at the second installation position and has a second clamping part. The second clamping part is arranged along the circumferential direction of the inner wall of the cylinder 5. The second clamping assembly 3 has a second concentric state of clamping the inner wall of the cylinder 5 and a second separated state of separating from the inner wall of the cylinder 5;

[0049] At least one distance measuring assembly 4 is arranged at the third installation position.

[0050] When applying the through-flow clearance detection device of this embodiment, the first clamping assembly 2 and the second clamping assembly 3 are respectively arranged on the mounting seat 1. When the first clamping assembly 2 clamps the central axis 6, the center of the detection device overlaps with the center of the central axis 6. At this time, the distance measuring assembly 4 detects a primary clearance value. After the first clamping assembly 2 separates, when the second clamping assembly 3 clamps the inner wall of the cylinder 5, the center of the detection device overlaps with the center of the cylinder 5. At this time, the distance measuring assembly 4 detects a secondary clearance value. By averaging the primary clearance value and the secondary clearance value, the measurement error caused by the non-concentricity of the central axis 6 and the cylinder 5 can be effectively eliminated, making the measurement result closer to the true through-flow clearance, and effectively solving the problem of large detection deviation in the existing through-flow clearance detection method.

[0051] Among them, as Figure 2 shown, the steam turbine further includes an impeller 7 and a support frame 8. The support frame 8 is arranged inside the cylinder 5, the central axis 6 is arranged on the support frame 8, and the impeller 7 is arranged outside the central axis 6.

[0052] Specifically, there are no restrictions on the measurement points and the number of the distance measuring assembly 4. It can be multi-point measurement or continuous measurement.

[0053] Furthermore, there are no restrictions on the specific structural forms of the first clamping assembly 2 and the second clamping assembly 3. The existing forms of clamping structures can be referred to, as long as the mounting seat 1 can be made concentric with the central axis 6 and the cylinder 5 respectively.

[0054] In the related art, when using the through-flow clearance detection equipment, only single-point or a few-point measurements are carried out, which is difficult to comprehensively reflect the clearance situation in the entire circumferential direction, and it is easy to miss local clearance abnormalities, resulting in inaccurate measurement.

[0055] In a possible implementation, the third mounting position extends along the circumferential direction of the cylinder 5. The distance measuring assembly 4 includes a measuring drive assembly and a distance measuring instrument 401. The distance measuring instrument 401 is arranged on the measuring drive assembly, and the measuring drive assembly is movably arranged along the circumferential direction on the third mounting position. With this form of distance measuring assembly 4, the distance measuring instrument 401 can achieve continuous circumferential detection, improving the detection accuracy and reliability.

[0056] Among them, the specific form of the measuring drive assembly is not limited. It can be a moving trolley that can roll or move by itself, or an annular structure driven by a motor, as long as it can drive the distance measuring instrument 401 to move along the circumferential direction.

[0057] Preferably, the distance measuring instrument 401 is a laser distance measuring instrument. Its specific working principle is as follows: The laser distance measuring instrument emits a continuous modulated laser signal. During the process of this signal propagating to the inner wall of the two target points, the cylinder 5, and the edge of the impeller 7 and reflecting back, a phase change will occur due to the different propagation distances. The distance measuring instrument measures the phase difference between them, and combines parameters such as the wavelength and frequency of the modulated signal to obtain the lateral straight-line distance between the two points.

[0058] In a possible implementation, the measuring drive assembly includes a first drive motor 402 and a moving ring 403. The moving ring 403 is rotatably arranged on the third mounting position, and the distance measuring instrument 401 is arranged on the moving ring 403. The first drive motor 402 is fixedly arranged on the mounting seat 1. A drive gear 404 is arranged on the drive shaft of the first drive motor 402. The inner ring of the moving ring 403 is provided with mating teeth for driving cooperation with the drive gear 404. The first drive motor 402 drives the moving ring 403 to rotate through the drive gear 404. The structural form of the measuring drive assembly is simple and reliable, and the weight distribution is relatively uniform. It can achieve continuous detection in the circumferential direction and detection at any position, effectively improving the detection flexibility.

[0059] Specifically, as Figure 2 shown, an annular mounting plate is arranged on the mounting seat 1, and an annular groove is arranged on the mounting plate. The moving ring 403 is rotatably arranged in the annular groove. The first drive motor 402 is fixedly installed on the mounting plate. The drive shaft of the first drive motor 402 is connected with a drive gear 404, and the drive gear 404 is meshed and connected with the moving ring 403. To facilitate meeting the measurement position requirements of the distance measuring instrument 401, a connecting plate is also fixedly connected to the moving ring 403. The connecting plate extends radially and extends out of the moving ring 403, and the distance measuring instrument 401 is connected through the connecting plate.

[0060] Furthermore, as Figure 2As shown in the figure, in order to mesh and connect the driving gear 404 with the moving ring 403, the first driving motor 402 is fixedly arranged on one side of the mounting plate close to the central axis 6. The driving shaft of the first driving motor 402 passes through the central axis 6 and is connected to the driving gear 404.

[0061] Among them, when the detection device is concentric with the central axis 6, the first driving motor 402 is started. The first driving motor 402 drives the driving gear 404 to rotate. The driving gear 404 meshes with the moving ring 403, thereby driving the moving ring 403 to rotate in the annular groove. When the moving ring 403 rotates, the connecting plate will rotate accordingly, and the rangefinder 401 on the connecting plate will also rotate. Furthermore, the clearance value between the blade of the impeller 7 and the inner wall of the cylinder 5 can be measured. After the detection device is concentric with the cylinder 5, the first driving motor 402 is started again. The rangefinder 401 continues to rotate under the action of the driving gear 404 and the moving ring 403 driven by the first driving motor 402, and the clearance value between the blade of the impeller 7 and the inner wall of the cylinder 5 is measured again.

[0062] In a possible implementation manner, the mounting seat 1 includes a first seat body 101 and a second seat body 102. The first seat body 101 is arranged close to the central axis 6. The second seat body 102 is arranged on the side of the first seat body 101 away from the central axis 6 and is connected to the first seat body 101. The first seat body 101 has a first mounting position and a third mounting position, and the second seat body 102 has a second mounting position;

[0063] The first clamping assembly 2 includes a first driving member 201 and a plurality of clamping structures 202. The plurality of clamping structures 202 are arranged at intervals along the circumferential direction. Each clamping structure 202 is arranged at the first mounting position so as to be movable along the radial direction. The first driving member 201 simultaneously drives the plurality of clamping structures 202 to move inward along the radial direction. The structural form of the first clamping assembly 2 is simple and reliable. By moving the plurality of clamping structures 202 together, the mounting seat 1 can be fixed to the central axis 6 and maintained in a concentric state.

[0064] Among them, the specific form and quantity of the first driving member 201 are not limited. The first driving member 201 can be a driving motor, a telescopic cylinder, a connecting component, etc. The quantity of the first driving member 201 can be one. By using one first driving member 201 to simultaneously drive the plurality of clamping structures 202 to move, the quantity of the first driving member 201 can also be multiple, and each clamping structure 202 is correspondingly provided with a first driving member 201 to drive the movement.

[0065] In a possible implementation, a plurality of clamping structures 202 are arranged at equal intervals. Each clamping structure 202 is provided with two first through-holes 2021. The first clamping assembly 2 further includes a plurality of first linkage rods 203. The first linkage rods 203 are inserted into the first through-holes 2021 of adjacent clamping structures 202. The first linkage rods 203 and the clamping structures 202 are arranged alternately. The plurality of first linkage rods 203 are arranged in a regular polygon enclosure. The first driving member 201 is connected to at least one of the first linkage rods 203 to drive the first linkage rod 203 to move along the radial direction. Through this form of structure, the clamping structures 202 can be linked to move together, which can not only realize the simultaneous equidistant movement of the plurality of clamping structures 202, but also make the movement process of the clamping structures 202 more stable and reliable.

[0066] In a possible implementation, the clamping structure 202 is further provided with a guiding hole 2022. The first clamping assembly 2 further includes a plurality of guiding rods 204. The guiding rods 204 extend along the radial direction and are inserted into the guiding holes 2022, and are fixedly arranged on the first seat body 101. The guiding rods 204 can not only play a role in restricting the moving direction of the clamping structure 202, but also connect the clamping structure 202 and the first seat body 101, so that the clamping structure 202 cannot move randomly along the radial direction.

[0067] Specifically, as Figure 4 and Figure 5 shown, taking the structure shown in the drawings as an example, one end of the clamping structure 202 is successively a first connecting section and a second connecting section along the axial direction. The first connecting section and the second connecting section are both provided with first through-holes 2021. A first linkage rod 203 is slidably connected between every two first connecting sections and every two second connecting sections. The inner surface of the first seat body 101 is fixedly connected with a first driving member 201. Two output ends of the first driving member 201 are both fixedly connected with a first rotating shaft 2011. The two first rotating shafts 2011 are arranged in opposite directions. The two first rotating shafts 2011 are respectively threadedly connected with two first linkage rods 203.

[0068] Among them, after the first driving member 201 is started, its two output ends drive the two first rotating shafts 2011 to rotate. Since the two first rotating shafts 2011 are arranged in opposite directions, the two first linkage rods 203 threadedly connected thereto will move towards the middle or outwards simultaneously. When the first linkage rod 203 moves, the first connecting section and the second connecting section will move along with the first linkage rod 203. Because the first connecting section is fixedly connected with the clamping structure 202, the eight clamping structures 202 will move inwards or outwards simultaneously in the strip-shaped hole 1011.

[0069] In a possible implementation, the first mounting position is provided with a plurality of strip-shaped holes 1011 extending radially. The clamping structure 202 is inserted into the corresponding strip-shaped holes 1011. Along the direction close to the central axis 6, the part of the clamping structure 202 protruding from the strip-shaped hole 1011 is the first clamping part;

[0070] The first linkage rod 203 is located on the side of the first base 101 away from the central axis 6. The number of the first linkage rods 203 and the clamping structures 202 is the same and both are even numbers. The first driving member 201 is a double-headed motor. Both sides of the first driving member 201 along the radial direction are provided with first rotating shafts 2011. Both of the two first rotating shafts 2011 have external threads. Threaded holes are provided on two oppositely arranged first linkage rods 203. The two first rotating shafts 2011 are in driving cooperation with the corresponding threaded holes. This driving form is more stable and reliable. The two first rotating shafts 2011 drive the oppositely arranged first linkage rods 203 to move simultaneously. Compared with only driving one first linkage rod 203, it is more stable and reliable, can disperse the stress of a single first linkage rod 203, and makes the device more stable and durable.

[0071] It can be understood that as an alternative implementation, the first driving member 201 can also be a single-headed motor. In this case, the number of the first linkage rods 203 and the clamping structures 202 need not be limited and need not be limited to an even number, as long as a regular polygon structure is formed.

[0072] Specifically, as Figure 4 and Figure 5 shown, taking the structure shown in the drawings as an example, the first base 101 is provided with eight strip-shaped holes 1011. A plurality of fixed seats are fixedly connected to the inner surface of the first base 101. A guide rod 204 is fixedly connected between every two fixed seats. A guide hole 2022 is provided on the clamping structure 202. The guide rod 204 penetrates through the inside of the guide hole 2022.

[0073] In a possible implementation, the second clamping assembly 3 includes a second driving member 301 and a plurality of support structures 302. The plurality of support structures 302 are arranged at intervals along the circumferential direction. Each support structure 302 is movably arranged along the radial direction at the second mounting position. The second driving member 301 simultaneously drives the plurality of support structures 302 to move radially outward. The structural form of the second clamping assembly 3 is simple and reliable. By moving the plurality of support structures 302 together, the mounting seat 1 can be fixed to the cylinder 5 and kept in a concentric state.

[0074] Specifically, as Figure 1As shown, the second clamping assembly 3 is located on the side of the second seat body 102 away from the first seat body 101. A plurality of guide seats 1021 are provided on the side of the second seat body 102 away from the first seat body 101. Each guide seat 1021 extends along the radial direction and is provided with a guiding hole extending along the radial direction. The support structure 302 is movably inserted into the guiding hole. The guide seat 1021 not only plays a limiting role but also can play a role in restricting the moving direction of the support structure 302.

[0075] In a possible implementation manner, a plurality of support structures 302 are arranged at equal intervals. Each support structure 302 is provided with two second through holes 3021. The second clamping assembly 3 further includes a plurality of second linkage rods 303. The second linkage rods 303 are inserted into the second through holes 3021 of adjacent support structures 302. The second linkage rods 303 and the support structures 302 are arranged alternately. The plurality of second linkage rods 303 are arranged in a positive polygon enclosure. The second driving member 301 is connected to two of the second linkage rods 303 to drive the second linkage rods 303 to move along the radial direction. Through this form of structure, the support structures 302 can be linked to move together, which can not only realize the simultaneous equal-distance movement of a plurality of support structures 302, but also make the movement process of the support structures 302 more stable and reliable.

[0076] Specifically, as Figure 1 and Figure 2 shown, taking the structure shown in the drawings as an example, one end of eight support structures 302 is successively a third connection section and a fourth connection section along the axial direction. A second linkage rod 303 is slidably connected between every two third connection sections and every two fourth connection sections. A bracket is fixedly connected to the inner wall of the first seat body 101. A second driving member 301 is fixedly connected to the front surface of the bracket. Both output ends of the second driving member 301 are fixedly connected with second rotating shafts 3011. The two second rotating shafts 3011 are arranged in opposite directions. The two second rotating shafts 3011 are respectively threadedly connected to two second linkage rods 303.

[0077] Among them, when the second driving member 301 is started, its two output ends drive the two second rotating shafts 3011 to rotate. Since the two second rotating shafts 3011 are arranged in opposite directions, the two second linkage rods 303 threadedly connected thereto will move towards the middle or outwards simultaneously. When the second linkage rod 303 moves, the third connection section and the fourth connection section will move along with the second linkage rod 303. Because the third connection section is fixedly connected to the support structure 302, the eight support structures 302 will move outwards or inwards simultaneously within the guide seat 1021.

[0078] In a possible embodiment, the second linkage rod 303 is located on the side of the second base body 102 away from the first base body 101, the number of the second linkage rods 303 and the support structure 302 is consistent and both are even numbers, the second driving member 301 is a double-headed motor, and the second driving member 301 is provided with second rotating shafts 3011 on both sides along the radial direction, and the two second rotating shafts 3011 both have external threads, and threaded holes are provided on the two oppositely arranged second linkage rods 303. The two second rotating shafts 3011 are matched with the corresponding threaded holes for transmission. This driving form is more stable and reliable. The two second rotating shafts 3011 simultaneously drive the oppositely arranged second linkage rods 303 to move at the same time. Compared with driving only one second linkage rod 303, it is more stable and reliable, and can disperse the force of a single second linkage rod 303, making the device more stable and durable.

[0079] In a possible embodiment, the first clamping component 2 also includes a first arc plate 205 arranged on each clamping structure 202, and the first arc plate 205 has a first clamping surface; the second clamping component 3 also includes a second arc plate 304 arranged on each supporting structure 302, and the second arc plate 304 has a second clamping surface. The arc-shaped clamping surface can more reliably make the clamping component fit with the arc surface of the corresponding component, and can make the concentric process more stable and reliable.

[0080] Specifically, Figure 4 and Figure 5 As shown, taking the structure shown in the accompanying drawings as an example, the side surfaces of the eight clamping structures 202 are all fixedly connected with the first arc plates 205 , and the eight first arc plates 205 are movably connected to the outer wall of the central axis 6 .

[0081] Among them, the eight first arc plates 205 move inward until they clamp the central axis 6. During this process, the guide rod 204 passes through the guide hole 2022 on the clamping structure 202, which plays a role in limiting the movement direction of the clamping structure 202, ensuring that the eight first arc plates 205 can accurately clamp the central axis 6 inward from eight directions at the same time, so that the center of the detection device overlaps with the center of the central axis 6.

[0082] Furthermore, if Figure 1 and Figure 2 As shown, taking the structure shown in the accompanying drawings as an example, eight guide seats 1021 are fixedly connected to the front surface of the second seat body 102, and the eight guide seats 1021 are slidably connected to the support structure 302, and one end of the eight support structures 302 is fixedly connected to the second arc plate 304, and the eight second arc plates 304 are movably connected to the inner wall of the cylinder 5.

[0083] The eight second arc plates 304 move outward until they are pressed against the inner wall of the cylinder 5 . In this way, the inner wall of the cylinder is pressed outward from eight directions at the same time, so that the center of the detection device overlaps with the center of the cylinder 5 .

[0084] The working process of the device itself will be described below:

[0085] During use, by moving the first linkage rod 203, under the connection of the first connecting section and the second connecting section and the limitation of the strip-shaped hole 1011, the eight first linkage rods 203 will simultaneously drive the eight clamping structures 202 to move, so that the eight first arc plates 205 will move inward simultaneously until the central shaft 6 is clamped. Since it is clamped inward from eight directions, at this time, the center of the detection device coincides with the center of the central shaft 6. By driving the rangefinder 401 to rotate through the moving ring 403, the clearance values at the four positions of up, down, left, and right are measured. Subsequently, the multiple first linkage rods 203 move in the reverse direction to release the first arc plate 205 from the central shaft 6. By moving the second linkage rod 303, under the connection of the third connecting section and the fourth connecting section and the limitation of the guide seat 1021, the eight second linkage rods 303 will simultaneously drive the eight second arc plates 304 to move outward until they are tightly pressed against the inner wall of the cylinder 5. Since it is tightly pressed outward from eight directions, at this time, the center of the detection device coincides with the center of the cylinder 5. Continuing to drive the rangefinder 401 to rotate through the moving ring 403, the clearance values at the four positions of up, down, left, and right are measured. Finally, the two clearance values obtained based on different centers are neutralized to effectively eliminate the measurement error caused by the non-concentricity of the central shaft and the cylinder, making the measurement result closer to the true flow-through clearance.

[0086] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A flow-through clearance detection device for detecting the flow-through clearance of a steam turbine, the steam turbine including a cylinder (5) and a central shaft (6) rotatably arranged in the cylinder (5), characterized in that, The through-flow clearance detection device includes: A mounting seat (1), adapted to be disposed in the cylinder (5). The mounting seat (1) has a first mounting position, a second mounting position, and a third mounting position. The first mounting position is disposed close to the central axis (6). The second mounting position is on the side of the first mounting position away from the central axis (6). The third mounting position is disposed close to the inner wall of the cylinder (5); A first clamping assembly (2), disposed at the first mounting position and having a first clamping portion. The first clamping portion is disposed along the circumferential direction of the central axis (6). The interior of the first clamping portion has a space for placing the end of the central axis (6). The first clamping assembly (2) has a first concentric state of clamping the outer wall of the central axis (6) and a first separated state of separating from the outer wall of the central axis (6); A second clamping assembly (3), disposed at the second mounting position and having a second clamping portion. The second clamping portion is disposed along the circumferential direction of the inner wall of the cylinder (5). The second clamping assembly (3) has a second concentric state of clamping the inner wall of the cylinder (5) and a second separated state of separating from the inner wall of the cylinder (5); At least one distance measuring assembly (4), disposed at the third mounting position.

2. The flow path clearance detection device according to claim 1, wherein The third mounting position extends along the circumferential direction of the cylinder (5). The distance measuring assembly (4) includes a measuring driving assembly and a distance measuring instrument (401). The distance measuring instrument (401) is disposed on the measuring driving assembly. The measuring driving assembly is movably disposed along the circumferential direction at the third mounting position.

3. The flow passage clearance detection device according to claim 2, characterized in that, The measuring driving assembly includes a first driving motor (402) and a moving ring (403). The moving ring (403) is rotatably disposed at the third mounting position. The distance measuring instrument (401) is disposed on the moving ring (403). The first driving motor (402) is fixedly disposed on the mounting seat (1). A driving gear (404) is disposed on the driving shaft of the first driving motor (402). A mating tooth for driving engagement with the driving gear (404) is disposed on the inner ring of the moving ring (403). The first driving motor (402) drives the moving ring (403) to rotate through the driving gear (404).

4. The flow passage clearance detection device according to any one of claims 1 to 3, characterized in that, The mounting seat (1) includes a first seat body (101) and a second seat body (102). The first seat body (101) is disposed close to the central axis (6). The second seat body (102) is disposed on the side of the first seat body (101) away from the central axis (6) and is connected to the first seat body (101). The first seat body (101) has the first mounting position and the third mounting position. The second seat body (102) has the second mounting position; The first clamping assembly (2) includes a first driving member (201) and a plurality of clamping structures (202). The plurality of clamping structures (202) are arranged at intervals along the circumferential direction. Each clamping structure (202) is movably disposed along the radial direction at the first mounting position. The first driving member (201) simultaneously drives the plurality of clamping structures (202) to move inward along the radial direction.

5. The flow passage clearance detection device according to claim 4, characterized in that, The plurality of clamping structures (202) are arranged at equal intervals, and each of the clamping structures (202) is provided with two first through holes (2021). The first clamping assembly (2) further comprises a plurality of first linkage rods (203), and the first linkage rods (203) are passed through the first through holes (2021) of adjacent clamping structures (202). The first linkage rods (203) and the clamping structures (202) are alternately arranged, and the plurality of first linkage rods (203) are arranged in the form of a regular polygon. The first driving member (201) is connected to at least one of the first linkage rods (203) to drive the first linkage rod (203) to move radially.

6. The flow passage clearance detection device according to claim 5, wherein The first mounting position is provided with a plurality of strip holes (1011) extending in a radial direction, the clamping structure (202) is inserted into the corresponding strip holes (1011), and along a direction close to the central axis (6), the portion of the clamping structure (202) that passes through the strip holes (1011) is the first clamping portion; The first linkage rod (203) is located on the side of the first seat body (101) away from the central axis (6), the number of the first linkage rods (203) and the clamping structure (202) are consistent and both are even numbers, the first driving member (201) is a double-headed motor, the first driving member (201) is provided with a first rotating shaft (2011) on both sides along the radial direction, the two first rotating shafts (2011) have external threads, and the two first linkage rods (203) arranged opposite to each other are provided with threaded holes, and the two first rotating shafts (2011) are in transmission cooperation with the corresponding threaded holes.

7. The flow passage clearance detection device according to claim 4, wherein The second clamping assembly (3) comprises a second driving member (301) and a plurality of supporting structures (302), wherein the plurality of supporting structures (302) are arranged at intervals along the circumferential direction, and each of the supporting structures (302) is arranged at the second mounting position so as to be movable along the radial direction, and the second driving member (301) simultaneously drives the plurality of supporting structures (302) to move radially outward.

8. The flow passage clearance detection device according to claim 7, characterized in that, The plurality of support structures (302) are arranged at equal intervals, and each of the support structures (302) is provided with two second through holes (3021). The second clamping assembly (3) further comprises a plurality of second linkage rods (303), and the second linkage rods (303) are passed through the second through holes (3021) of adjacent support structures (302). The second linkage rods (303) and the support structures (302) are alternately arranged, and the plurality of second linkage rods (303) are arranged in the form of a regular polygon. The second driving member (301) is connected to two of the second linkage rods (303) to drive the second linkage rods (303) to move radially.

9. The flow passage clearance detection device according to claim 8, wherein, The second linkage rod (303) is located on the side of the second base body (102) away from the first base body (101), the number of the second linkage rods (303) and the supporting structure (302) is consistent and both are even numbers, the second driving member (301) is a double-headed motor, the second driving member (301) is provided with second rotating shafts (3011) on both sides along the radial direction, the two second rotating shafts (3011) both have external threads, and the two second linkage rods (303) arranged opposite to each other are provided with threaded holes, and the two second rotating shafts (3011) are in transmission cooperation with the corresponding threaded holes.

10. The flow passage clearance detection device according to claim 7, characterized in that, The first clamping assembly (2) further comprises a first arc plate (205) arranged on each of the clamping structures (202), wherein the first arc plate (205) has a first clamping surface; And / or, the second clamping assembly (3) further comprises a second arc plate (304) arranged on each of the supporting structures (302), and the second arc plate (304) has a second clamping surface.

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