Coaxiality measuring device

Abstract

The utility model discloses a coaxiality measuring device, and belongs to the technical field of supporting, positioning and measuring. The defect that in the prior art, due to the fact that traditional disc oil and gas sealing assemblies are not directly checked after being assembled, coaxiality is poor, friction between a rotating piece and a static piece is caused, potential safety hazards are caused, and the stability of a whole gas turbine is adversely affected is overcome. The main structure of the device comprises a measurement connecting piece installed on a bearing in a turbine middle frame assembly, extending rods on the two sides of the measurement connecting piece are connected with a first concentricity measurement sleeve and a second concentricity measurement sleeve respectively, and a bent handle clamp and a straight handle clamp are installed on the second concentricity measurement sleeve through screws. The straight handle clamp is provided with an arc-shaped strip plate used for measuring coaxiality lengthening of the disc type oil seal and gas seal assembly. The utility model is mainly applied to the gas turbine.

Description

Technical Field

[0001] The utility model belongs to the technical field of support positioning measurement, and in particular relates to a coaxiality measuring device for a bearing chamber of a turbine middle frame assembly and various disc-type sealing assemblies on a gas turbine. Background Art

[0002] With the rapid development of domestic gas turbine technology, the structural design of various components is becoming more and more complex at this stage. Among them, the central bearing chamber of the turbine frame assembly in the gas turbine is particularly precise and complex in structure. The various disc oil and gas seal components that match the bearing chamber and the bearing and bearing chamber components all require higher coaxiality requirements to ensure the clearance value between the central rotating part and the bearing and the various disc oil and gas seal components in the diameter direction. Otherwise, the central rotating part will cause rotational friction with the various disc oil and gas seal components. In the early assembly process of the turbine frame assembly, the coaxiality of the bearing cavity and the disc oil and gas sealing components is ensured by the size of each part. At the same time, in the design process of the parts, the connection and matching parts of the disc oil and gas sealing components and the bearing cavity are all small interference fits. Then, the disc oil and gas sealing components are assembled by reasonable assembly means, and each contact surface is checked with a feeler gauge to see if it is seated in place. After the assembly is completed, it is considered that the coaxiality of each seal and the bearing is qualified. There is a risk of coaxiality exceeding the tolerance without a positioning measurement tool for direct inspection, which may cause friction between rotating parts and stationary parts, causing safety hazards, and adversely affecting the stability of the gas turbine as a whole.

[0003] For example, the Chinese invention patent with application number 202210760404.5 discloses a motor end cover coaxiality measuring device and method, which measures the coaxiality of the motor end cover separately by using the bearing positioning on the tooling, but its shortcomings are: its use and measurement procedures are complicated, and the measurement accuracy is not high. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a coaxiality measuring device, which realizes the coaxiality measurement problem of the oil and gas sealing components of the discs in front and behind the bearing chamber of the turbine frame assembly by adjusting the positions of the clamps and the strips. The operation is convenient and the assembly quality of the turbine frame assembly is improved.

[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] A coaxiality measuring device comprises a measuring connecting piece installed on a bearing in a frame assembly in a turbine, a first concentricity measuring sleeve and a second concentricity measuring sleeve are respectively connected to the extending rods on both sides of the measuring connecting piece, a bent handle clamp and a straight handle clamp are installed on the second concentricity measuring sleeve by screws, and an arc strip is arranged on the straight handle clamp.

[0007] Preferably, a strip is provided on the handlebar clamp.

[0008] Preferably, the connection position between the strip and the handlebar clamp is adjustable.

[0009] Preferably, the strip plate is provided with a strip-shaped long hole, and the bent handle clamp is connected to the strip plate through a hand screw and the strip-shaped long hole. The required length of the inner ring of the sealing component can be achieved by adjusting and tightening the hand screw.

[0010] Preferably, a dial indicator for measuring coaxiality is installed at the front end of the strip through a pressure gauge screw.

[0011] Preferably, the strips include first strips and / or second strips.

[0012] Preferably, the second concentricity measuring sleeve is installed on the extension rod on the left side of the measuring connection piece through the second O-ring, and the first concentricity measuring sleeve is installed on the extension rod on the right side of the measuring connection piece through the first O-ring. The first O-ring, the second O-ring and the extension rods on both sides of the measuring connection piece are matched with a very small gap, so that the first O-ring and the second O-ring can be manually moved to rotate on the extension rods on both sides during operation.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model solves the problem of measuring the coaxiality of the oil and gas seals at the front and rear positions of the bearing chamber of the turbine mid-frame assembly of the gas turbine after the installation, effectively avoids the problem of the oil and gas seals at the front and rear positions of the bearing chamber of the rotor and the turbine mid-frame assembly after the whole machine is assembled, and at the same time improves the quality requirements of the turbine mid-frame assembly; the utility model enables the radial clearance between the high-speed rotor assembly of the whole machine and the oil and gas seal assembly to be supported by data, and further the clearance can be controlled within a reasonable and effective range, providing a theoretical basis for the clearance design of product parts; at the same time, the utility model makes the assembly clearance and quality of the turbine mid-frame assembly more reasonable, increases the assembly accuracy of the turbine mid-frame assembly, and thus increases the reliability of the gas turbine as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Axonometric measurement of the utility model Figure 1 ;

[0016] Figure 2Axonometric measurement of the utility model Figure 2 ;

[0017] Figure 3 Axonometric measurement of the utility model Figure 3 ;

[0018] Figure 4 It is the front view of the utility model.

[0019] In the figure: 1. first concentricity measuring sleeve; 2. bent handle clamp; 3. first strip; 4. first O-ring; 5. second concentricity measuring sleeve; 6. strip clamp; 7. thumb screw; 8. pressure gauge screw; 9. second O-ring; 10. straight handle clamp; 11. curved strip; 12. second strip; 13. measuring connector; 14. strip long hole; 15. strip. DETAILED DESCRIPTION

[0020] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0021] Embodiment 1:

[0022] like Figure 1-4 As shown, a coaxiality measuring device includes a measuring connector 13 installed on a bearing in a turbine frame assembly, a first concentricity measuring sleeve 1 and a second concentricity measuring sleeve 5 are respectively connected to the extending rods on both sides of the measuring connector 13, a bent handle clamp 2 and a straight handle clamp 10 are installed on the second concentricity measuring sleeve 5 by screws, and an arc strip 11 is provided on the straight handle clamp 10.

[0023] In this embodiment, the measuring connection piece 13 is installed on the installation position of the bearing in the frame assembly of the turbine after being frozen with dry ice, and the first concentricity measuring sleeve 1 and the second concentricity measuring sleeve 5 are installed on the extension rods on both sides of the measuring connection piece 13, and are respectively fixed to the extension rods of the measuring connection piece 13 through the first O-ring 4 and the second O-ring 9 to realize the measurement of the coaxiality of the left and right oil and gas sealing components. The curved handle clamp 2 and the straight handle clamp 10 are fixed to the second concentricity measuring sleeve 5 by screw fastening. When the left and right measurement positions are not enough, the screws can be loosened to move the curved handle clamp 2 and the straight handle clamp 10 left and right on the second concentricity measuring sleeve 5 to realize it.

[0024] Embodiment 2:

[0025] A coaxiality measuring device, which is different from the embodiment 1 in that a strip 15 is provided on the handlebar clamp 2, wherein the strip 15 includes a first strip 3 and / or a second strip 12. In order to better adapt to oil and gas sealing components of different diameters, the lengths of the first strip 3 and the second strip 12 are different.

[0026] Furthermore, the connection position between the strip plate 15 and the handlebar clamp 2 is adjustable. In this embodiment, the strip plate 15 is provided with a strip-shaped long hole 14, and the handlebar clamp 2 is connected to the strip plate 15 through the hand screw 7 and the strip-shaped long hole 14. By adjusting and tightening the hand screw 7, the required length of the inner ring of the sealing assembly can be achieved.

[0027] Furthermore, a dial gauge for measuring coaxiality is installed at the front end of the strip plate 15 through a pressure gauge screw 8. In this embodiment, the first strip plate 3, the strip clamp 6, the arc strip plate 11, and the second strip plate 12 are all extension rods for measuring the coaxiality of the disc-type oil-sealing and air-sealing components, and the front ends can be clamped with a dial gauge to realize the measurement function.

[0028] Furthermore, the second concentricity measuring sleeve 5 is installed on the extension rod on the left side of the measuring connection piece 13 through the second O-ring 9, and the first concentricity measuring sleeve 1 is installed on the extension rod on the right side of the measuring connection piece 13 through the first O-ring 4. The first O-ring 4, the second O-ring 9 and the extension rods on both sides of the measuring connection piece 13 are matched with each other through a very small gap, so that the first O-ring 4 and the second O-ring 9 can be manually moved to rotate on the extension rods on both sides during operation.

[0029] The measurement and use method of the utility model is:

[0030] 1. After installing the coaxiality measuring device, adjust the position of the dial indicator and pre-press the dial indicator to a certain range;

[0031] 2. Rotate the curved handle clamp 2 or the straight handle clamp 10 to make the dial indicator rotate one circle on the sealing assembly, find the highest point of the inner ring of the oil and gas sealing assembly, and mark the position with a marker;

[0032] 3. Rotate the dial indicator 180° again and record the runout at the position marked in step 2;

[0033] 4. Use an inside diameter dial indicator or inside diameter micrometer to measure the diameter at the marked point, which is the minimum diameter;

[0034] 5. By calculation: (minimum diameter - runout) / 2 = minimum radius;

[0035] 6. Record the minimum radius and compare it with the minimum radius of the rotor during the assembly of the whole machine to obtain the clearance value between the rotating parts and the disc sealing components, and check whether the clearance meets the design requirements;

[0036] 7. If the gap value does not meet the design requirements, the oil and gas sealing components must be removed and reassembled. If the sealing components do not have angular positioning requirements, they can be rotated and reassembled until the gap value meets the design requirements.

[0037] It can be seen that the coaxiality measuring device of a disc assembly in the utility model measures the coaxiality of each disc oil and gas sealing assembly before and after the bearing chamber based on the bearing and calculates the coaxiality error using a reasonable measurement method. If an error is found, the oil and gas sealing assembly will be disassembled and reassembled in time to provide data support for the rotor assembly during the assembly of the gas turbine, prevent the occurrence of adverse factors, reduce the risk of rework due to unqualified components when the assembly of the whole machine is finally completed, and increase the quality requirements of the assembly.

Claims

1. A coaxiality measuring device, characterized in that: The invention comprises a measuring connecting piece (13) installed on a bearing in a frame assembly in a turbine, wherein the extending rods on both sides of the measuring connecting piece (13) are respectively connected to a first concentricity measuring sleeve (1) and a second concentricity measuring sleeve (5), a curved handlebar clamp (2) and a straight handlebar clamp (10) are installed on the second concentricity measuring sleeve (5), and an arc-shaped strip plate (11) is arranged on the straight handlebar clamp (10).

2. The coaxiality measuring device according to claim 1, characterized in that: The handlebar clamp (2) is provided with a strip plate (15).

3. The coaxiality measuring device according to claim 2, characterized in that: The connection position between the strip plate (15) and the handlebar clamp (2) is adjustable.

4. The coaxiality measuring device according to claim 3, characterized in that: The strip plate (15) is provided with a strip-shaped long hole (14), and the handlebar clamp (2) is connected to the strip plate (15) via a hand screw (7) and the strip-shaped long hole (14).

5. The coaxiality measuring device according to claim 4, characterized in that: A dial gauge for measuring coaxiality is installed at the front end of the strip plate (15) via a pressure gauge screw (8).

6. The coaxiality measuring device according to any one of claims 2 to 5, characterized in that: The strips (15) include first strips (3) and / or second strips (12).

7. The coaxiality measuring device according to any one of claims 1 to 5, characterized in that: The second concentricity measuring sleeve (5) is mounted on the protruding rod on the left side of the measuring connecting piece (13) via a second O-ring (9), and the first concentricity measuring sleeve (1) is mounted on the protruding rod on the right side of the measuring connecting piece (13) via a first O-ring (4).

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