Compressor rotor blade tip size measuring device

Abstract

The utility model discloses a compressor rotor blade tip dimension measuring device, which comprises a positioning plate, a fastener and a support, and is characterized in that the positioning plate is provided with a strip-shaped hole along the length direction, and the strip-shaped hole is used for assembling a depth measuring mechanism to measure the distance between the blade tip of a rotor blade to be measured and the outer wall of a shaft neck; the two brackets are symmetrically arranged and are respectively arranged on shaft necks at the two ends of the to-be-tested rotor so as to position and support the two ends of the positioning plate; and the fasteners are arranged in the strip-shaped holes in a penetrating manner, are in threaded fit with the brackets and are used for fastening the positioning plate on the two brackets. In the process of repairing the blade tip of the gas compressor rotor blade, the device can be erected on shaft necks at the two ends of a rotor to be measured to form a bridge type structure, the positioning plate serves as a datum plane to be matched with a depth measuring mechanism to measure the distance between the blade tip of the rotor and the outer wall of the shaft neck, and therefore the size of the blade tip of the rotor is accurately controlled; it is guaranteed that the assembling gap between the rotor blade tip and the compressor casing meets the requirement; and the operation is simple, and the blade tip repairing precision can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of outer diameter measurement, in particular to a compressor rotor blade tip size measuring device. Background Art

[0002] The compressor rotor is an important core component of the gas turbine. The air enters the low-pressure compressor through the air intake device, where the air is compressed. During the normal operation of the gas turbine, the blade tip and the inner wall of the compressor casing are usually rubbed against each other due to insufficient clearance between the compressor rotor blade tip and the inner wall of the compressor casing, resulting in severe wear of the blade tip. Therefore, the blade tip needs to be repaired so that its outer diameter meets the design requirements to ensure the clearance between the blade tip and the inner wall of the compressor casing.

[0003] The repair of the blade tip of the compressor rotor blade usually involves first extending the blade tip by laser cladding, and then removing the blade tip excess by grinding. During the grinding process of the blade tip excess, the outer diameter of the blade tip is usually measured synchronously to ensure the repair accuracy of the blade tip so that the gap between it and the inner wall of the compressor casing meets the requirements. In the prior art, the compressor rotor casing is usually used to directly measure the gap between the rotor blade tip and the inner wall of the rotor casing. However, due to position limitations, only part of the blade tip gap can be measured. For the parts that cannot be directly measured, lead wire or iron cement is used for indirect measurement, that is, the lead wire or iron cement is placed in the gap to be measured and pressure is applied to fill the gap, and then it is taken out of the gap to be measured, and its thickness is measured by a micrometer or a vernier caliper. The measured thickness is the size of the gap to be measured, but due to the plastic deformation of the lead wire or iron cement, the measurement accuracy is low. In addition, the above-mentioned method requires frequent lifting of the compressor rotor, which is very cumbersome. Utility Model Content

[0004] The utility model provides a compressor rotor blade tip size measuring device to solve the technical problem in the prior art that the blade tip size measurement is difficult during the repair of the compressor rotor blade tip, resulting in low blade tip repair accuracy.

[0005] According to one aspect of the utility model, a compressor rotor tip size measuring device is provided, comprising: a positioning plate, the positioning plate having a strip hole opened along the length direction, for assembling a depth measuring mechanism to measure the distance between the tip of the rotor blade to be measured and the outer wall of the shaft neck; two symmetrically arranged brackets, for being respectively placed on the shaft necks at both ends of the rotor to be measured to position and support the two ends of the rotor to be measured; a fastener, which is inserted into the strip hole and cooperates with the bracket thread, for fastening the positioning plate to the two brackets.

[0006] Furthermore, the bracket is a boss structure, including a support block for supporting the positioning plate and a positioning block movably inserted into the strip hole; the distance between the upper end surface of the support block and the shaft neck of the rotor to be measured is greater than the outer diameter of the rotor blade to be measured, and a threaded hole for mating with the fastener thread is provided in the positioning block.

[0007] Furthermore, a first groove is provided at the bottom of the support block. The first groove is a symmetrical V-shaped structure and is used for engaging with the journal of the rotor to be tested for positioning and supporting to achieve centering.

[0008] Furthermore, a base is correspondingly provided at the bottom of the bracket for supporting the bracket on the journal of the rotor to be tested.

[0009] Furthermore, a second groove is provided on the end surface of the base facing the bracket, and is used to enclose with the first groove to form a space for the journal of the rotor to be tested to movably pass through.

[0010] Furthermore, the fastener includes a screw threadedly connected to the bracket and a nut arranged above the positioning plate and threadedly connected to the screw, and a gasket is arranged between the nut and the positioning plate.

[0011] Furthermore, the nut is a star nut.

[0012] Furthermore, the length of the strip-shaped hole is adapted to the distance between the journals at both ends of the rotor to be tested.

[0013] Furthermore, the positioning plate is marked with scales along the length direction.

[0014] Furthermore, the depth measuring mechanism is inserted into the strip hole, and includes a measuring piece for measuring the distance between the blade tip and the shaft neck of the rotor blade to be measured and a limiting piece for limiting the position on the upper end of the positioning plate. The measuring piece and the limiting piece are slidably matched along the radial direction of the rotor to be measured.

[0015] The utility model has the following beneficial effects:

[0016] The compressor rotor blade tip size measuring device of the utility model can directly set up the bracket on the shaft necks at both ends of the rotor to be measured so that a bridge structure is formed above the rotor to be measured, and then the positioning plate is used as a reference surface, so that the bracket cooperates with the depth measuring mechanism to measure the distance between the rotor blade tip and the outer wall of the shaft neck to achieve the measurement of the outer diameter size of the rotor blade tip. The operation is simple and convenient, and there is no need to repeatedly hoist or disassemble the rotor. The measuring speed is fast and the efficiency is high. The device can measure the rotor blade tip size during the repair process of the compressor rotor blade tip, so that the size control of the rotor blade tip repair is more accurate, and it is ensured that the assembly gap between the repaired rotor blade tip and the compressor casing meets the requirements. By opening a strip hole on the positioning plate, the bracket can slide in the strip hole to adjust the distance between the two brackets, so that it can flexibly adapt to compressor rotors of different lengths. By assembling the depth measuring mechanism in the strip hole, the outer diameter size of the rotor blade tip at different positions can be measured by sliding in the strip hole, which can effectively improve the measurement work efficiency. The device has a simple structure and is easy to operate, and can effectively improve the repair accuracy of the blade tip, thereby ensuring the quality of the rotor; it is also easy to install and disassemble and can be used cyclically.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 It is a front view of the compressor rotor blade tip size measuring device of the preferred embodiment of the utility model during measurement;

[0020] Figure 2 It is a top view of the positioning plate of the preferred embodiment of the utility model;

[0021] Figure 3 It is a cross-sectional view of the bracket during measurement in the preferred embodiment of the utility model.

[0022] Legend:

[0023] 100, bracket; 101, support block; 1011, first groove; 102, positioning block; 200, rotor to be measured; 300, positioning plate; 301, strip hole; 400, depth measuring mechanism; 401, measuring piece; 402, limit piece; 500, fastener; 501, nut; 502, gasket. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the compressor rotor blade tip size measuring device of this embodiment includes a bracket 100, a positioning plate 300 and a fastener 500. Two brackets 100 are symmetrically arranged, and are used to be placed on the shaft necks at both ends of the rotor 200 to be measured for positioning and support. The positioning plate 300 is arranged between the two brackets 100. The positioning plate 300 is provided with a strip hole 301 along the length direction, which is used for the bracket 100 to be movably penetrated and equipped with a depth measuring mechanism 400 to measure the distance between the blade tip of the blade of the rotor 200 to be measured and the outer wall of the shaft neck. The depth measuring mechanism 400 is arranged between the two brackets 100 and slidably penetrated in the strip hole 301. Preferably, the depth measuring mechanism 400 is a vernier depth gauge; optionally, the strip hole 301 is an oblong hole. The fastener 500 is penetrated in the strip hole 301 and is threadedly matched with the bracket 100, and is used to fasten the positioning plate 300 to the two brackets 100. Specifically, the positioning plate 300 is sleeved on the two brackets 100 through the strip hole 301, so that the bracket 100 stably supports it, and then the fastener 500 is sequentially inserted into the strip hole 301 and the bracket 100 from the top of the positioning plate 300 to connect the positioning plate 300 and the bracket 100 as a whole, and then the two brackets 100 are respectively placed on the shaft necks at both ends of the rotor 200 to be tested, and the positions of the two brackets 100 are adjusted to match the axial distance between the shaft necks at both ends of the rotor 200 to be tested, and then continue to screw The fastener 500 fastens the positioning plate 300 to the bracket 100, and finally the depth measuring mechanism 400 is assembled in the strip hole 301 between the two brackets 100 and limited by the positioning plate 300, so that its measuring end moves toward the shaft neck direction of the rotor 200 to be measured, and the distance between the blade tip of the blade of the rotor 200 to be measured and the shaft neck is measured to achieve the measurement of the outer diameter size of the rotor blade tip, and the depth measuring mechanism 400 is controlled to move along the length direction of the strip hole 301 to measure the blade tip sizes of multiple blades of the rotor 200 to be measured.The device can directly set the bracket 100 on the shaft necks at both ends of the rotor 200 to be tested, so that a bridge structure is formed above the rotor 200 to be tested, and then the positioning plate 300 is used as a reference surface to cooperate with the depth measuring mechanism 400 to measure the distance between the rotor blade tip and the outer wall of the shaft neck, so as to achieve the measurement of the outer diameter size of the rotor blade tip. The operation is simple, and there is no need to repeatedly hoist or disassemble the rotor. The measurement speed is fast and the efficiency is high. The device can measure the rotor blade tip size during the repair process of the compressor rotor blade tip, so as to The size control is more accurate, ensuring that the assembly gap between the repaired rotor blade tip and the compressor casing meets the requirements, the repair accuracy is high, and the product quality is improved; by opening a strip hole 301 on the positioning plate 300, the bracket 100 can slide in the strip hole 301 to adjust the distance between the two brackets 100, so that it can flexibly adapt to compressor rotors of different lengths; by assembling the depth measurement mechanism 400 in the strip hole 301, it can slide in the strip hole 301 to measure the outer diameter of the rotor blade tip at different positions, which can effectively improve the measurement efficiency. Optionally, the bracket 100 and the shaft neck of the rotor 200 to be measured are connected by a snap connection, so that it is easy to take and easy to operate; optionally, the bracket 100 and the shaft neck of the rotor 200 to be measured can also be a movable fit to avoid the bracket 100 and the shaft neck from moving relative to each other when the rotor is rotating, so that the device can measure the outer diameter of the blade tip along the radial direction of the rotor, improving the flexibility and work efficiency of the device. Optionally, the bracket 100 and the journal of the rotor to be tested 200 may also be fixedly connected to improve the stability of the placement of the device on the rotor journal.

[0026] like Figure 1 , Figure 2 and Figure 3As shown, the bracket 100 is movably arranged in the strip hole 301 of the positioning plate 300, so that the positions of the two brackets 100 can be adjusted by controlling the bracket 100 to slide in the strip hole 301, so that it can adapt to the axial distance between the journals at both ends of the different rotors 200 to be tested, and the flexibility is high. The bracket 100 is a boss structure, including a support block 101 for supporting the positioning plate 300 and a positioning block 102 movably arranged in the strip hole 301, and the support block 101 and the positioning block 102 are fixedly connected or integrally formed. The upper end surface of the support block 101 is in contact with the positioning plate 300 through the fastener 500, and the lower end surface is used for supporting by clamping cooperation with the shaft neck of the rotor 200 to be measured. The distance between the upper end surface of the support block 101 and the shaft neck of the rotor 200 to be measured is greater than the outer diameter of the blade tip of the rotor 200 to be measured, so as to avoid the bottom surface of the positioning plate 300 arranged on the upper end surface of the support plate from contacting with the blade tip of the rotor 200 to be measured, thereby preventing damage to the blade tip and leaving a measuring space for the depth measuring mechanism 400 assembled on the positioning plate 300; a threaded hole is provided in the positioning block 102 for threaded cooperation with the fastener 500 to fasten the positioning plate 300 to the support block 101; the height of the positioning block 102 is less than or equal to the height of the positioning plate 300, leaving space for the connection of the fastener 500, so that the fastener 500 can contact with the upper surface of the positioning plate 300 for fastening. Preferably, the outer surface shape of the positioning block 102 is matched with the inner wall shape of the strip hole 301 to increase the contact area with the positioning plate 300, prevent the positioning plate 300 from shaking, and improve stability.

[0027] like Figure 3 As shown, a first groove 1011 is provided at the bottom of the support block 101. The first groove 1011 is a symmetrical V-shaped structure, so that the bracket 100 is connected to the shaft neck of the rotor 200 to be measured through the first groove 1011 for positioning and support, so as to realize the vertical alignment of the bracket 100 and the rotor 200 to be measured, so that the device can be stably placed on the rotor 200 to be measured, and is easy to take and operate, thereby improving work efficiency. The distance between the bottom end of the first groove 1011 and the upper end face of the shaft neck placed inside the first groove 1011 is greater than or equal to the radius of the shaft neck, so as to improve the stability of the connection with the shaft neck of the rotor 200 to be measured, so that the bracket 100 is stably placed. Optionally, the inner wall of the first groove 1011 is covered with an anti-slip pad to prevent relative movement with the shaft neck when measuring the outer diameter of the rotor blade tip, thereby affecting the accuracy of the measurement. Optionally, the first groove 1011 of the bracket 100 and the journal of the rotor 200 to be tested may be fastened with screws after being clamped, so as to improve the stability of the device placed on the rotor journal and avoid tipping. Optionally, the first groove 1011 may be an arc groove.

[0028] Preferably, a base is correspondingly provided at the bottom of the bracket 100, which is used to contact the bottom of the support block 101 for support, so that the device can be stably placed on the journal of the rotor 200 to be tested. The base and the bracket 100 are respectively arranged on the upper and lower sides of the journal of the rotor 200 to be tested, and form a space for the journal of the rotor 200 to be tested to pass through with the first groove 1011 of the bracket 100. Optionally, the bracket 100 is directly placed on the base, or the base and the bracket 100 are detachably connected by bolts.

[0029] Preferably, a second groove is provided on the end surface of the base facing the bracket 100, and the second groove is correspondingly arranged with the first groove 1011 to enclose with the first groove 1011 to form a space for the journal of the rotor 200 to be tested to move through. Optionally, the second groove is a V-shaped groove or an arc groove.

[0030] like Figure 1 As shown, the fastener 500 includes a screw and a nut 501, the screw is movably inserted into the strip hole 301 of the positioning plate 300, a threaded hole is provided in the support block 101 of the bracket 100, the screw is connected to the bracket 100 through the threaded hole, and the nut 501 is arranged above the positioning plate 300 and fastened to the bracket 100 by being threadedly connected with the screw. Preferably, a gasket 502 is provided between the nut 501 and the positioning plate 300 to enhance the fastening effect. Optionally, the fastener 500 can also be a bolt, and the positioning plate 300 is fastened to the bracket 100 by inserting the bolt into the strip hole 301 and the threaded hole in sequence.

[0031] Preferably, the nut 501 is a star-shaped nut, so that there is a larger contact area between it and the positioning plate 300 or the gasket 502, providing a more uniform fastening force, a good fastening effect, and facilitating installation and removal operations.

[0032] like Figure 1 and Figure 2 As shown, the length of the strip hole 301 is adapted to the distance between the journals at both ends of the rotor 200 to be tested, so that the distance between the two brackets 100 movably inserted into the strip hole 301 can be adjusted to a distance adapted to the journals at both ends of the rotor 200 to be tested. Preferably, the positioning plate 300 is provided with a plurality of length sizes, and an adapted positioning plate 300 can be selected according to rotors of different sizes, thereby expanding the scope of application and having high flexibility.

[0033] like Figure 1 and Figure 2As shown, the positioning plate 300 is marked with scales along the length direction, and the depth measuring mechanism 400 is movably arranged in the strip hole 301 of the positioning plate 300, and two depth measuring mechanisms 400 can be installed in the strip hole 301, so that the two sides of the blade tip of the rotor 200 to be measured can be limited by the cooperation of the two depth measuring mechanisms 400, and the thickness of the blade tip of the rotor blade can be measured by the scale on the positioning plate 300, so as to ensure that the thickness of the blade tip also meets the total requirement, further improve the accuracy of rotor blade tip repair, and effectively improve the quality of the rotor.

[0034] Preferably, the depth measuring mechanism 400 is provided in the strip hole 301, and includes a measuring piece 401 and a limiting piece 402. The measuring piece 401 is movably provided in the strip hole 301 and is arranged perpendicular to the positioning plate 300. The measuring piece 401 can slide in the strip hole 301 along the radial direction of the rotor 200 to be measured and the length direction of the strip hole 301, so that the measuring end of the measuring piece 401 can be controlled to move along the radial direction of the rotor 200 to the outer wall direction of the shaft neck of the rotor 200 to be measured, so as to measure the distance between the tip of the blade of the rotor 200 to be measured and the shaft neck; the limiting piece 402 is arranged on the upper end surface of the positioning plate 300, and is limited by the positioning plate 300. The measuring piece 401 and the limiting piece 402 slide together along the radial direction of the rotor 200 to be measured, so that the measuring piece 401 can measure with the positioning plate 300 as the reference plane through the limiting piece 402. Optionally, the depth measuring mechanism 400 is a vernier depth gauge.

[0035] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A compressor rotor blade tip size measuring device, characterized in that: include: A positioning plate (300), wherein the positioning plate (300) is provided with a strip-shaped hole (301) along the length direction and is used for assembling a depth measuring mechanism (400) to measure the distance between the tip of a blade of a rotor (200) to be measured and the outer wall of a journal; Two symmetrically arranged brackets (100) are used to be respectively placed on the shaft necks at both ends of the rotor (200) to be tested so as to position and support the two ends of the positioning plate (300); The fastener (500) is inserted into the strip-shaped hole (301) and is threadably matched with the bracket (100), and is used to fasten the positioning plate (300) to the two brackets (100).

2. The compressor rotor blade tip size measuring device according to claim 1, characterized in that: The bracket (100) is a boss structure, comprising a support block (101) for supporting the positioning plate (300) and a positioning block (102) movably inserted into the strip hole (301); The distance between the upper end surface of the support block (101) and the journal of the rotor (200) to be measured is greater than the outer diameter of the blade of the rotor (200) to be measured, and a threaded hole for threadedly cooperating with the fastener (500) is provided in the positioning block (102).

3. The compressor rotor blade tip size measuring device according to claim 2, characterized in that: The bottom of the support block (101) is provided with a first groove (1011), and the first groove (1011) is a symmetrical V-shaped structure, and is used for engaging with the journal of the rotor (200) to be tested for positioning and supporting to achieve centering.

4. The compressor rotor blade tip size measuring device according to claim 3, characterized in that: A base is correspondingly provided at the bottom of the support block (101) for supporting the bracket (100) above the journal of the rotor (200) to be tested.

5. The compressor rotor blade tip size measuring device according to claim 4, characterized in that: A second groove is provided on the end surface of the base facing the bracket (100), and is used to enclose with the first groove (1011) to form a space for the journal of the rotor (200) to be tested to movably pass through.

6. The compressor rotor blade tip size measuring device according to claim 1, characterized in that: The fastener (500) comprises a screw rod threadedly connected to the bracket (100) and a nut (501) arranged above the positioning plate (300) and threadedly connected to the screw rod. A gasket (502) is provided between the nut (501) and the positioning plate (300).

7. The compressor rotor blade tip size measuring device according to claim 6, characterized in that: The nut (501) is a star-shaped nut.

8. The compressor rotor blade tip size measuring device according to claim 1, characterized in that: The length of the strip-shaped hole (301) is adapted to the distance between the journals at both ends of the rotor (200) to be tested.

9. The compressor rotor blade tip size measuring device according to claim 1, characterized in that: The positioning plate (300) is marked with scales along the length direction.

10. The compressor rotor blade tip size measuring device according to claim 1, characterized in that: The depth measuring mechanism (400) is inserted into the strip-shaped hole (301), and comprises a measuring piece (401) for measuring the distance between the tip of a blade of the rotor (200) to be measured and the shaft neck, and a limiting piece (402) for limiting the position at the upper end of the positioning plate (300), wherein the measuring piece (401) and the limiting piece (402) are slidably matched along the radial direction of the rotor (200) to be measured.

Images