Thermal straightening tool for bearing cylinder of axial flow compressor

Abstract

The utility model relates to the technical field of axial flow compressor bearing cylinder correction, in particular to an axial flow compressor bearing cylinder thermal correction tool. The tool comprises a connecting cylinder, a first length adjusting rod and a second length adjusting rod, reverse internal threads are arranged at the two ends of the connecting cylinder, one end of the first length adjusting rod and one end of the second length adjusting rod are in threaded connection with the two ends of the connecting cylinder respectively, and the other end of the first length adjusting rod is connected with a first fixing block; the other end of the second length adjusting rod is connected with a second fixing block, clamping grooves are formed in the first fixing block and the second fixing block, and the clamping grooves are used for being arranged on the edge of the top of the bearing cylinder in a clamped mode. The device not only can be used for treating the necking deformation of the bearing cylinder, but also can be used for treating the expansion deformation of the bearing cylinder.

Description

Technical Field

[0001] This utility model relates to the field of thermal straightening technology for axial compressor cylinder bearings, specifically a thermal straightening tooling for axial compressor cylinder bearings. Background Technology

[0002] Axial flow compressors are general-purpose equipment widely used in metallurgy, oil refining, chemical engineering, pharmaceuticals, and other industries. They primarily provide air and other media energy to blast furnaces and catalytic cracking units. The compressor mainly consists of a casing, regulating cylinder, bearing cylinder, and rotor. During operation, the temperature of components such as the rotor and bearing cylinder rises significantly, typically exceeding 200°C in exhaust temperature. This can lead to bearing cylinder scuffing, bearing cylinder constriction deformation, or bearing cylinder expansion deformation. Furthermore, human error during unit operation can cause prolonged surge in the unit, as well as scuffing between the moving blades and the bearing cylinder, scuffing between the stationary blades and the main shaft, and bearing cylinder constriction or expansion deformation, potentially resulting in a systemic shutdown.

[0003] To improve the stability and reliability of equipment operation and reduce the probability of unit shutdown due to interlocking mechanisms, it is necessary to straighten deformed bearing cylinders. Currently, deformed bearing cylinders are typically straightened mechanically or thermally. Mechanical straightening uses molds and external force for straightening, but this method is only suitable for minor deformations and its effectiveness is relatively poor. Therefore, tooling is generally used to support the deformed bearing cylinder before heat treatment for thermal straightening, which restores the cylinder's dimensions through heating. However, existing straightening tooling suffers from poor stability and can only support and straighten the constricted end of the bearing cylinder, not the expanded end. Therefore, it is essential to design a stable thermal straightening tooling for axial compressor bearing cylinders that can both support and straighten constricted ends and handle expanded deformations. Utility Model Content

[0004] The purpose of this invention is to overcome the aforementioned problems in the prior art and to provide a thermal straightening fixture for the bearing cylinder of an axial compressor with good stability. It can handle not only the shrinkage deformation of the bearing cylinder but also the expansion deformation of the bearing cylinder.

[0005] This utility model provides a thermal straightening fixture for an axial compressor bearing cylinder, including a connecting cylinder, a first length adjusting rod, and a second length adjusting rod. The two ends of the connecting cylinder are provided with reverse internal threads. One end of the first length adjusting rod and the second length adjusting rod are respectively threaded to the two ends of the connecting cylinder. The other end of the first length adjusting rod is connected to a first fixing block, and the other end of the second length adjusting rod is connected to a second fixing block. Both the first fixing block and the second fixing block are provided with locking grooves, which are used to lock onto the top edge of the bearing cylinder.

[0006] Preferably, the shape of the locking groove matches the shape of the top edge of the cylinder.

[0007] Preferably, both the first fixing block and the second fixing block are provided with pressure plates. One end of the pressure plate is used to be threaded to the threaded hole at the top edge of the bearing cylinder, and the other end of the pressure plate is used to cover the first fixing block or the second fixing block.

[0008] Preferably, the first length adjusting rod and the first fixing block, as well as the second length adjusting rod and the second fixing block, are integrally formed.

[0009] Preferably, the connecting cylinder has at least one first skid hole for rotating the connecting cylinder.

[0010] Preferably, the connecting cylinder includes an inner cylinder and an outer cylinder. The inner cylinder extends through the outer cylinder along its length and is rotatably connected to the outer cylinder. The two ends of the inner cylinder are provided with reverse internal threads. One end of the first length adjusting rod and the second length adjusting rod are respectively threaded to the two ends of the inner cylinder. Two third length adjusting rods are symmetrically provided on the outer cylinder. Both third length adjusting rods are at the same angle to the axis of the outer cylinder. One end of both third length adjusting rods is hinged to the outer cylinder. The other end of both third length adjusting rods is used to abut against the inner wall of the bearing cylinder. The first skid hole is located on the inner cylinder wall exposed outside the outer cylinder.

[0011] Preferably, the two third length adjusting rods are at a 45° angle to the axis of the outer cylinder.

[0012] Preferably, the third length adjusting rod includes a sleeve and two support rods. The sleeve is provided with a second skid hole and reverse internal threads at both ends. One end of each of the two support rods is threaded to both ends of the sleeve. The other end of one of the support rods is hinged to the outer cylinder, and the other end of the other support rod is used to abut against the inner wall of the bearing cylinder.

[0013] Preferably, the end of the support rod that abuts against the inner wall of the bearing cylinder is an arc surface.

[0014] Preferably, the first length adjusting rod, the second length adjusting rod, the connecting cylinder, and the third length adjusting rod are all made of 05Cr17Ni4Cu4Nb material.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The axial compressor bearing cylinder thermal straightening fixture provided by this utility model can handle both bearing cylinder constriction deformation and bearing cylinder expansion deformation. When handling bearing cylinder constriction deformation, by rotating the connecting cylinder, the first and second length adjusting rods threaded on the connecting cylinder simultaneously undergo relative displacement, reducing the length between the connecting cylinder and the first and second length adjusting rods, thereby allowing the bearing cylinder to complete the bearing cylinder constriction deformation support under the pull of the locking groove and the first and second length adjusting rods. When handling bearing cylinder expansion deformation, by rotating the connecting cylinder, the first and second length adjusting rods threaded on the connecting cylinder simultaneously undergo opposite displacement, increasing the length between the connecting cylinder and the first and second length adjusting rods, thereby allowing the bearing cylinder to complete the bearing cylinder expansion deformation support under the push of the locking groove and the first and second length adjusting rods.

[0017] By supporting the bearing cylinder with the third length adjusting rod, not only is the stability of the straightening fixture improved, but the accuracy of the first and second length adjusting rods in adjusting the expansion and contraction of the bearing cylinder is also improved.

[0018] The axial compressor bearing cylinder thermal straightening fixture provided by this utility model has the advantages of simple structure, convenient assembly and disassembly, and high adjustment efficiency. Attached Figure Description

[0019] Figure 1 A front view of the thermal straightening fixture for the axial compressor cylinder of this utility model. Figure 1 .

[0020] Figure 2 A front view of the thermal straightening fixture for the axial compressor cylinder of this utility model. Figure 2 .

[0021] Figure 3 This is a front view of the first or second adjusting component of the axial compressor bearing cylinder thermal straightening fixture of this utility model.

[0022] Figure 4 This is a top view of the pressure plate of the thermal straightening fixture for the axial compressor cylinder of this utility model.

[0023] Figure 5 This is the stress relief curve of an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Support cylinder; 2. Adjusting fixture; 3. First fixing block; 4. Second fixing block; 5. First length adjusting rod; 6. Second length adjusting rod; 7. Connecting cylinder; 8. Third length adjusting rod; 9. Pressure plate. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 ~Attached Figure 5 The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the protection scope of this utility model.

[0027] This invention solves the problems of poor stability of the original straightening fixture, which can only support and straighten the constricted end of the bearing cylinder and cannot straighten the expanded bearing cylinder. It also has the drawback of requiring repeated straightening.

[0028] like Figures 1-4 As shown, this utility model provides a thermal straightening fixture for an axial compressor bearing cylinder, comprising: a connecting cylinder 7, a first length adjusting rod 5, and a second length adjusting rod 6. The two ends of the connecting cylinder 7 are provided with reverse internal threads. One end of the first length adjusting rod 5 and the second length adjusting rod 6 are respectively threaded to the two ends of the connecting cylinder 7. The other end of the first length adjusting rod 5 is connected to a first fixing block 3, and the other end of the second length adjusting rod 6 is connected to a second fixing block 4. Both the first fixing block 3 and the second fixing block 4 are provided with locking grooves, which are used to lock onto the top edge of the bearing cylinder 1.

[0029] When adjusting the cylinder constriction deformation and cylinder expansion deformation of the axial compressor provided in this utility model, the connecting cylinder 7 needs to be rotated. When dealing with the constriction deformation of the cylinder, by rotating the connecting cylinder 7, the first length adjusting rod 5 and the second length adjusting rod 6 threadedly connected to the connecting cylinder 7 are relatively displaced, reducing the length between the connecting cylinder 7 and the first length adjusting rod 5 and the second length adjusting rod 6. This allows the cylinder 1 to complete the constriction deformation support under the pull of the locking groove and the first length adjusting rod 5 and the second length adjusting rod 6. When dealing with the expansion deformation of the cylinder 1, by rotating the connecting cylinder 7, the first length adjusting rod 5 and the second length adjusting rod 6 threadedly connected to the connecting cylinder 7 are displaced in opposite directions, increasing the length between the connecting cylinder 7 and the first length adjusting rod 5 and the second length adjusting rod 6. This allows the cylinder 1 to complete the expansion deformation support under the push of the first length adjusting rod 5 and the second length adjusting rod 6 with the locking groove. The integral connection of one end of the first length adjusting rod 5 with the first fixing block 3 and the integral connection of one end of the second length adjusting rod 6 with the second fixing block 4, as well as the clamping grooves on the first fixing block 3 and the second fixing block 4, can further facilitate the tooling to handle the cylinder's constriction deformation and expansion deformation.

[0030] Specifically, the shape of the clamping groove matches the shape of the top edge of the bearing cylinder 1. This prevents the clamping groove from directly contacting the bearing cylinder 1 and causing damage to it.

[0031] Specifically, the first length adjusting rod 5, the first fixing block 3, the second length adjusting rod 6, and the second fixing block 4 are integrally formed. This design mainly takes into account the forces on the first length adjusting rod 5, the first fixing block 3, the second length adjusting rod 6, and the second fixing block 4 when the tooling handles the deformation of the bearing cylinder's constriction and expansion.

[0032] Specifically, in order to further increase the stability of clamping, pressure plates 9 are provided on the first fixing block 3 and the second fixing block 4. One end of the pressure plate 9 is used to be threaded to the threaded hole on the top edge of the bearing cylinder 1, and the other end of the pressure plate 9 is used to cover the first fixing block 3 or the second fixing block 4.

[0033] Specifically, the connecting cylinder 7 has at least one first skid hole for rotating the connecting cylinder 7. This is to facilitate rotating the connecting cylinder 7 and increase its practicality.

[0034] Specifically, in order to further control the change in the final shape of the inner wall of the bearing cylinder 1 due to thermal expansion during the heat straightening process, and to ensure the stability of the straightening fixture is not adversely affected by the displacement of the first length adjusting rod 5 and the second length adjusting rod 6 when the bearing cylinder 1 is expanded or contracted in the horizontal direction, the connecting cylinder 7 includes an inner cylinder and an outer cylinder. The inner cylinder passes through the outer cylinder along the length direction of the outer cylinder and is rotatably connected to the outer cylinder. The two ends of the inner cylinder are provided with reverse internal threads. One end of the first length adjusting rod 5 and the second length adjusting rod 6 are respectively threaded to the two ends of the inner cylinder. Two third length adjusting rods 8 are symmetrically provided on the outer cylinder. Both third length adjusting rods 8 are at the same angle to the axis of the outer cylinder. One end of both third length adjusting rods 8 is hinged to the outer cylinder, and the other end of both third length adjusting rods 8 is used to abut against the inner wall of the bearing cylinder 1. The first skid hole is located on the inner cylinder wall exposed outside the outer cylinder.

[0035] Specifically, the two third-length adjusting rods 8 form a 45° angle with the axis of the outer cylinder. This 45° angle helps ensure the stability of the straightening fixture. This is because setting the 45° angle avoids excessive concentrated loads on the outer cylinder of the connecting cylinder 7 or the two third-length adjusting rods 8, thereby improving the overall stability and lifespan of the fixture.

[0036] Specifically, the third length adjusting rod 8 includes a sleeve and two support rods. The sleeve is provided with a second skid hole and reverse internal threads at both ends. One end of each of the two support rods is threaded to both ends of the sleeve. The other end of one support rod is hinged to the outer cylinder, and the other support rod is used to abut against the inner wall of the bearing cylinder 1.

[0037] Specifically, the end of the support rod that abuts against the inner wall of the bearing cylinder 1 has an arc surface. This is to prevent damage to the inner wall of the bearing cylinder 1.

[0038] Specifically, the first length adjusting rod 5, the second length adjusting rod 6, the connecting cylinder 7, and the third length adjusting rod 8 are all made of 05Cr17Ni4Cu4Nb material. This differs from the traditional straightening tooling, which uses 45 steel. Existing traditional straightening tooling uses 45 steel, which suffers from low strength, poor heat resistance, and a large coefficient of thermal expansion. This invention selects 05Cr17Ni4Cu4Nb material, which has higher strength and better heat resistance. The mechanical properties of this 05Cr17Ni4Cu4Nb material increase the strength requirements, improving the overall strength of the first length adjusting rod 5, the second length adjusting rod 6, the connecting cylinder 7, and the third length adjusting rod 8. This prevents the tooling from deforming at high temperatures, thus preventing the thermal straightening failure of the bearing cylinder 1.

[0039] Molybdenum disulfide is applied to the threads between the first length adjusting rod 5, the second length adjusting rod 6, and the connecting piece 7 to increase the lubrication coefficient of the threads and prevent the bolts from seizing.

[0040] When opening cylinder 1, open it by about 0.6mm each time, wait 10 minutes, open it by about 0.6mm again, and wait another 10 minutes. It is not allowed to open it by more than 1mm directly.

[0041] Example

[0042] A thermal straightening fixture for axial compressor cylinders, the straightening process includes four steps:

[0043] Step 1: Inspect the dimensions of bearing cylinder 1, and simultaneously measure and record the deformation results of bearing cylinder 1. Input the measurement results into the computer and use Ansys to create a model of the specific deformation of bearing cylinder 1.

[0044] Step 2: Perform thermal correction simulation on the established model, and determine the correction heating temperature, heating time, and cooling time based on the simulation results.

[0045] The specific steps in step 2 are as follows: 1) Mesh the model. Mesh generation can be semi-free or specialized. Select a suitable model mesh based on element mass, Jacobian, torsion factor, parallelism error, etc. Then set the material property parameters, including: density, elastic modulus, Poisson's ratio, coefficient of thermal expansion, thermal conductivity, specific heat capacity, yield strength, and tensile strength.

[0046] 2) Determination of coefficients for the creep constitutive equation:

[0047] 3) Select and set coefficients C1, C2, and C3 according to the material properties of the object being heat-corrected;

[0048] 4) After applying constraint forces to the model, apply different heating loads, heating times, and heat dissipation loads. Solve the problem, compare and check the thermal correction results of cylinder 1, and repeat the simulation until the simulation results of cylinder 1 model meet or are close to the design requirements, and determine the heating temperature, heating time, and cooling time.

[0049] Based on the simulation results, stress relief is performed according to the following... Figure 5 The curve shown indicates that the temperature rises by no more than 80°C per hour, where T is the heating temperature and t is the heating time.

[0050] Step 3, design the thermal straightening fixture, such as Figures 1-4 As shown, the designed straightening fixture includes an adjustment fixture 2, which comprises a first length adjusting rod 5, a second length adjusting rod 6, a first fixing block 3, a second fixing block 4, and a connecting cylinder 7. The first length adjusting rod 5 and the second length adjusting rod 6 are coaxially designed with the connecting cylinder 7. The first length adjusting rod 5 is welded to the first fixing block 3, and the second length adjusting rod 6 is welded to the second fixing block 4. The two ends of the connecting cylinder 7 are provided with reverse internal threads. In use, the locking grooves on the first fixing block 3 and the second fixing block 4 are respectively locked onto the top edge of the bearing cylinder 1. By rotating at least one pry hole on the connecting cylinder 7 for rotating the connecting cylinder 7, the connecting cylinder 7 cooperates with the first length adjusting rod 5 and the second length adjusting rod 6 respectively. By rotating the connecting cylinder 7, the first length adjusting rod 5 and the second length adjusting rod 6 can move relative to each other or towards each other to adjust the distance between the first length adjusting rod 5 and the inner wall of the bearing cylinder 1, and to adjust the distance between the second length adjusting rod 6 and the inner wall of the bearing cylinder 1, so as to conveniently and freely adjust the size of the bearing cylinder 1.

[0051] Step 4: Because the connecting cylinder 7 includes an inner cylinder and an outer cylinder, the inner cylinder passes through the outer cylinder along the length direction of the outer cylinder and is rotatably connected to the outer cylinder. Two third length adjusting rods 8 are symmetrically provided on the outer cylinder. Both third length adjusting rods 8 are at the same angle to the axis of the outer cylinder. One end of both third length adjusting rods 8 is hinged to the outer cylinder, and the other end of both third length adjusting rods 8 is used to abut against the inner wall of the bearing cylinder 1. The first skid hole is located on the inner cylinder wall exposed outside the outer cylinder.

[0052] Adjust the height of the third length adjustment rod 8 to make the bearing cylinder 1 reach the pre-corrected design dimensions of horizontal L and vertical H as much as possible. During measurement, use an inside micrometer and a depth caliper to measure the horizontal distance L and vertical height distance H of the inner wall of the bearing cylinder 1 respectively. If the horizontal distance L does not meet twice the vertical height distance H, then fine-tune the dimensions of the bearing cylinder 1 by adjusting the two third length adjustment rods 8 with an angle of 45° between them and the central axis of the bearing cylinder 1. Make the dimensions of the bearing cylinder 1 reach the design value, press the pressure plate 9 on the first fixing block 3 and the second fixing block 4, and fix it with bolts.

[0053] The third length adjusting rod 8 includes a sleeve and two support rods. The sleeve is provided with a second skid hole and reverse internal threads at both ends. One end of each of the two support rods is threaded to both ends of the sleeve. The other end of one of the support rods is hinged to the outer cylinder, and the other support rod is used to abut against the inner wall of the bearing cylinder 1.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hot straightening tool for a bearing cylinder of an axial compressor, characterized in that The utility model relates to a length adjustable cylinder, including connecting cylinder (7), first length adjusting rod (5) and second length adjusting rod (6), both ends of connecting cylinder (7) are equipped with reverse internal thread, one end of first length adjusting rod (5) and second length adjusting rod (6) are respectively connected with both ends of connecting cylinder (7) thread, the other end of first length adjusting rod (5) is connected with first fixed block (3), the other end of second length adjusting rod (6) is connected with second fixed block (4), and the recess for clamping is set up on first fixed block (3) and second fixed block (4) all, the recess for clamping is used for clamping on the top edge of cylinder (1).

2. A hot straightening tool for a bearing cylinder of an axial compressor according to claim 1, characterized in that The opening shape of the recess for clamping matches the shape of the top edge of the cylinder (1).

3. The hot straightening tool for a bearing cylinder of an axial compressor according to claim 1, characterized in that, The first length adjusting rod (5) and the first fixed block (3) and the second length adjusting rod (6) and the second fixed block (4) are integrally formed.

4. The hot straightening tooling for a bearing cylinder of an axial compressor of claim 1, wherein, The first fixed block (3) and the second fixed block (4) are provided with a pressing plate (9), one end of the pressing plate (9) is used for being threadedly connected with the threaded hole of the top edge of the cylinder (1), and the other end of the pressing plate (9) is used for covering the first fixed block (3) or the second fixed block (4).

5. A hot straightening tool for a bearing cylinder of an axial compressor as defined in claim 1, wherein At least one first pry hole is formed in the connecting cylinder (7) for rotating the connecting cylinder (7).

6. A hot straightening tool for a bearing cylinder of an axial compressor as defined in claim 5, characterized in that The connecting cylinder (7) includes an inner cylinder and an outer cylinder, the inner cylinder penetrates the outer cylinder along the length direction of the outer cylinder and is rotatably connected with the outer cylinder, both ends of the inner cylinder are provided with reverse internal threads, one end of the first length adjusting rod (5) and the second length adjusting rod (6) is respectively threadedly connected with both ends of the inner cylinder, two third length adjusting rods (8) are symmetrically arranged on the outer cylinder, both third length adjusting rods (8) are at the same angle with the axis of the outer cylinder, one end of both third length adjusting rods (8) is hingedly connected to the outer cylinder, and the other end of both third length adjusting rods (8) is used for abutting against the inner wall of the cylinder (1), and the first pry hole is located on the inner cylinder exposed outside the outer cylinder.

7. A hot straightening tool for a bearing cylinder of an axial compressor as defined in claim 6, characterized in that Both third length adjusting rods (8) are at a 45° angle with the axis of the outer cylinder.

8. A hot straightening tool for a bearing cylinder of an axial compressor as defined in claim 6, characterized in that The third length adjusting rod (8) includes a sleeve and two support rods, a second pry hole is formed in the sleeve, both ends of the sleeve are provided with reverse internal threads, one end of both support rods is respectively threadedly connected with both ends of the sleeve, one end of one of the support rods is hingedly connected to the outer cylinder, and the other end of the other support rod is used for abutting against the inner wall of the cylinder (1).

9. A hot straightening tool for a bearing cylinder of an axial compressor as defined in claim 8, characterized in that The end of the support rod for abutting against the inner wall of the cylinder (1) is an arc surface.

10. The hot straightening tool for a bearing cylinder of an axial compressor according to claim 6, characterized in that, The first length adjusting rod, the second length adjusting rod, the connecting cylinder (7) and the third length adjusting rod (8) are made of 05Cr17Ni4Cu4Nb material.

Images