A connection structure between a cylinder body and a bearing box in a steam turbine and an installation method thereof

Abstract

A connection structure for a cylinder body and a bearing box in a steam turbine and an installation method thereof, belonging to the technical field of steam turbine connection structures, the present invention is to solve the problem that the expansion difference between the bearing box and the cylinder during the operation of the existing steam turbine is too large, and the ordinary centering beam structure and the connecting beam body cannot meet the safety operation requirements. The connection structure described in the present application includes a centering beam assembly and two connecting cat claws, the centering beam assembly is arranged between the cylinder body and the bearing box, one end of the centering beam assembly is detachably connected to the end wall of the cylinder body close to the bearing box, the other end of the centering beam assembly is detachably connected to the side plate of the bearing box, the two connecting cat claws are symmetrically arranged on both sides of the centering beam assembly, one end of each connecting cat claw is integrally formed with the end wall of the cylinder body close to the bearing box, and the other end of each connecting cat claw is detachably connected to the bearing box support plate through an adjustable support unit. The present invention is used to connect the cylinder body and the bearing box in a steam turbine.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine connection structures, and in particular relates to a connection structure between a cylinder body and a bearing box in a steam turbine and an installation method thereof. Background Art

[0002] At present, the turbine centering beam structures on the market are all installed normally in a cold state. When the turbine is running, a certain offset will be generated to absorb the displacement difference between the bearing box and the cylinder due to the inconsistent expansion. However, the bearing capacity of the centering beam is limited. When the displacement is too large, the reaction force of the structure on the cylinder is too large, affecting the stability of the cylinder, and cannot meet the safe operation requirements of the unit. In addition, the rigidity of the cylinder body and the bearing box is poor when only the centering beam is used to connect the cylinder body and the bearing box. The connection process also involves a connecting beam body, but the existing connecting beam bodies are all fixed by welding. Once a displacement difference occurs between the cylinder body and the bearing box, this connection method cannot effectively eliminate the offset caused by the displacement difference, and it is also easy to cause operating accidents. Therefore, it is in line with practical needs to develop a connection structure for the cylinder body and the bearing box in the turbine to effectively eliminate the offset generated between the bearing box and the cylinder when the turbine is running. Summary of the invention

[0003] In order to solve the problem that the expansion difference between the bearing box and the cylinder during the operation of the existing steam turbine is too large, and the ordinary centering beam structure and the connecting beam body cannot meet the safety operation requirements, the present invention provides a connecting structure for the cylinder body and the bearing box in the steam turbine and an installation method thereof;

[0004] A connection structure for a cylinder body and a bearing box in a steam turbine, the connection structure comprising a centering beam assembly and two connecting cat claws, the centering beam assembly being arranged between the cylinder body and the bearing box, one end of the centering beam assembly being detachably connected to an end wall of the cylinder body close to the bearing box, the other end of the centering beam assembly being detachably connected to a side plate of the bearing box, the two connecting cat claws being symmetrically arranged on both sides of the centering beam assembly, one end of each connecting cat claw being integrally formed with an end wall of the cylinder body close to the bearing box, and the other end of each connecting cat claw being detachably connected to a support plate of the bearing box via an adjustable support unit;

[0005] Further, the centering beam assembly includes a centering beam body and two disassembly connection mechanism groups, each of which is arranged on one end of the centering beam body, one end of the centering beam body is disassembly connected to an end wall of a cylinder body close to one end of a bearing box through one disassembly connection mechanism group, and the other end of the centering beam body is disassembly connected to a side plate of the bearing box through another disassembly connection mechanism group;

[0006] The disassembly connection mechanism group includes N disassembly connection mechanisms, N is a positive integer, and the N disassembly connection mechanisms are equidistantly arranged at the end of the centering beam body along the width direction of the centering beam body;

[0007] The disassembly connection mechanism includes a positioning unit and a locking unit, and the positioning unit and the locking unit are arranged opposite to each other up and down;

[0008] Further, the positioning unit includes a positioning pin, a bushing, a washer assembly and a positioning pin locking nut. A through hole No. 1 is processed at the setting position of the positioning unit on the centering beam body, and the bushing is embedded in the through hole No. 1. One end of the positioning pin passes through the bushing and is set in a positioning hole on the end wall of the cylinder body close to one end of the bearing box or a positioning hole on the side plate of the bearing box, and the positioning pin and the positioning hole are set with interference fit. An external thread is processed on the outer cylindrical surface of the other end of the positioning pin, and the positioning pin locking nut is sleeved on the other end of the positioning pin, and the positioning pin locking nut is threadedly connected with the positioning pin. A washer assembly is provided between the positioning pin locking nut and the centering beam body, and the washer assembly is sleeved on the outer cylindrical surface of the positioning pin;

[0009] Further, the washer assembly includes a convex washer and a concave washer, one end of the concave washer is plugged into one end of the convex washer, the other end of the convex washer is tightly fitted with the centering beam, and the other end of the concave washer is tightly fitted with the positioning pin locking nut;

[0010] Furthermore, a drawing thread blind hole is processed on the end surface of the other end of the positioning pin;

[0011] Further, the locking unit includes a stud and a locking nut, a No. 2 through hole is processed on the centering beam body at the setting position corresponding to the locking unit, one end of the stud passes through the centering beam body and is set in a threaded hole on the end wall of the cylinder body close to the bearing box or a threaded hole on the side plate of the bearing box, and the stud is threadedly connected with the threaded hole, the locking nut is sleeved on the other end of the stud, the locking nut is threadedly connected with the stud, a washer is provided between the locking nut and the centering beam body, and the washer is sleeved on the outer circumferential surface of the stud;

[0012] Furthermore, a gasket is provided between the centering beam and the end wall of the cylinder body close to the bearing box, and a plurality of No. 3 through holes are evenly distributed on the gasket, and each No. 3 through hole is correspondingly arranged with a positioning pin or a stud;

[0013] Furthermore, the adjustable support unit includes an adjusting gasket, a pressure block and three bolt and nut mechanisms. Three mounting through holes are processed at corresponding positions of the bearing box support plate and each connecting cat claw. Each mounting through hole is arranged corresponding to a bolt and nut mechanism. The pressure block is arranged above the bearing box support plate. A convex edge is arranged on the side of the pressure block close to the connecting cat claw. The convex edge and the pressure block are integrally formed. The adjusting gasket is arranged between the bearing box support plate and the pressure block. The adjusting gasket, the pressure block and the bearing box support plate are fastened and connected by the three bolt and nut mechanisms. The other end of the connecting cat claw is arranged between the adjusting gasket and the pressure block. The other end of the connecting cat claw is clamped and fixed by the adjusting gasket and the pressure block.

[0014] Furthermore, the bolt and nut mechanism includes a stud and three mounting nuts, one end of the stud passes through the pressure block, the adjusting gasket and the bearing box support plate in sequence and is arranged below the bearing box support plate, one end of the stud is sleeved with two mounting nuts, and the two mounting nuts are threadedly connected to one end of the stud, the other end of the stud is arranged above the pressure block, the other end of the stud is sleeved with a mounting nut, and the mounting nut is threadedly connected to the other end of the stud, a countersunk hole is processed on the top of the pressure block, and the mounting nut sleeved on the other end of the stud is arranged in the countersunk hole;

[0015] A method for installing a connection structure between a cylinder body and a bearing box in a steam turbine, the method being implemented by the following steps:

[0016] Step 1: Align the cylinder body in the turbine with the bearing box to be connected, so that each connecting claw overlaps the connection on the bearing box support plate. In this process, the thickness of the adjustment gasket can be adjusted according to the spacing between the connecting claw and the bearing box support plate; 2 groups of adjustment gaskets should be prepared, one group with normal thickness alignment is marked as A, and the other group is marked as B with a thickness 1.5mm thinner (the thickness difference is the pre-bias amount). In this step, use the adjustment gasket with thickness B to install first.

[0017] Step 2: Set the centering beam between the cylinder body and the bearing box to be connected, and position the centering beam through N positioning units. One end of the positioning pin in each positioning unit passes through the centering beam and is correspondingly set in the positioning hole on the end wall of the cylinder body close to the bearing box or the positioning hole on the side plate of the bearing box. The other end of the positioning pin is fixed to the centering beam through the positioning pin locking nut to ensure the stability of the centering beam.

[0018] Step 3: Install the locking unit, and fasten the centering beam body and the end wall of the cylinder body close to the bearing box and the side plate of the bearing box through N locking units and N positioning units;

[0019] Step 4: Lift the cat's claw with a hydraulic jack, remove the adjusting gasket with a thickness of B and install the adjusting gasket with a thickness of A, and pre-tighten and fix the cat's claw with the adjusting gasket with a thickness of A, the pressure block and the bearing box support plate by a bolt and nut mechanism;

[0020] Step 5: Install two additional bolt and nut mechanisms, and use three bolt and nut mechanisms to fasten the connecting cat claw with the adjusting gasket with thickness A, the pressure block and the bearing box support plate to achieve the fastening connection between the connecting cat claw and the bearing box support plate, and complete the installation process of the cylinder body in the turbine and the bearing box to be connected.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a connection structure between a cylinder body and a bearing box in a steam turbine and an installation method thereof. By optimizing the structure of a conventional horizontal centering beam into a pre-biased centering beam structure, the displacement difference between the bearing box and the cylinder caused by inconsistent expansion can be effectively absorbed. The positioning unit and the locking unit can be accurately and stably connected to the bearing box and the cylinder, so that the steam turbine unit can be stable during operation. Since the positioning unit and the locking unit can be disassembled, when the centering beam is damaged or nearing the end of its service life, it is convenient to replace it. A connecting cat claw is used to replace the traditional connecting beam structure, and the traditional welding fixation or fixation by connecting key is optimized to clamping fixation using a pressure block and an adjusting gasket, thereby improving the ability of the connecting cat claw to absorb displacement and further enhancing the stability of the steam turbine unit during operation, so that it can meet the safety operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a main view connection diagram of the connection structure of the present invention:

[0024] Figure 2 It is a top view schematic diagram of the connection structure of the present invention;

[0025] Figure 3 It is a front view connecting cross-sectional view of the central fixed center beam assembly of the present invention;

[0026] Figure 4 It is a front view of the cat claw connection cross-sectional view of the present invention;

[0027] In the figure, 1 is a locating pin, 2 is a gasket, 3 is a bushing, 4 is a centering beam, 5 is a convex washer, 6 is a concave washer, 7 is a locating pin locking nut, 8 is a drawing thread blind hole, 9 is a stud, 10 is a locking nut, 11 is a bearing box side plate, 12 is a cylinder body end wall close to the bearing box, 13 is a connecting cat claw, 14 is a bearing box support plate, 15 is an adjusting gasket, 16 is a pressure block, 17 is a stud and 18 is a mounting nut. DETAILED DESCRIPTION

[0028] Specific implementation method 1: refer to Figures 1 to 4 To explain this embodiment, this embodiment provides a connection structure between a cylinder block and a bearing box in a steam turbine, the connection structure comprising a centering beam assembly and two connecting claws 13, the centering beam assembly being arranged between the cylinder block and the bearing box, one end of the centering beam assembly being detachably connected to an end wall 12 of the cylinder block close to the bearing box, the other end of the centering beam assembly being detachably connected to a side plate 11 of the bearing box, the two connecting claws 13 being symmetrically arranged on both sides of the centering beam assembly, one end of each connecting claw 13 being integrally formed with an end wall 12 of the cylinder block close to the bearing box, and the other end of each connecting claw 13 being detachably connected to a bearing box support plate 14 via an adjustable support unit.

[0029] Specific implementation method 2: refer to Figures 1 to 4 This embodiment is described. This embodiment further defines the centering beam assembly described in the specific embodiment 1. The centering beam assembly described in this embodiment includes a centering beam body 4 and two disassembly connection mechanism groups. Each disassembly connection mechanism group is arranged on one end of the centering beam body 4. One end of the centering beam body 4 is disassembled and connected to an end wall 12 of a cylinder body close to one end of a bearing box through a disassembly connection mechanism group. The other end of the centering beam body 4 is disassembled and connected to a side plate 11 of a bearing box through another disassembly connection mechanism group.

[0030] The disassembly connection mechanism group includes N disassembly connection mechanisms, where N is a positive integer, and the N disassembly connection mechanisms are equidistantly arranged at the ends of the centering beam body 4 along the width direction of the centering beam body 4;

[0031] The disassembly connection mechanism includes a positioning unit and a locking unit, and the positioning unit and the locking unit are arranged opposite to each other up and down. Other components and connection methods are the same as those of the first specific embodiment.

[0032] In this embodiment, the centering beam 4 is accurately positioned during installation through the positioning unit, and the centering beam 4 is firmly connected during installation through the locking unit. In order to ensure the accuracy of positioning, the positioning units on both sides of the centering beam 4 are staggered during installation, that is, the positioning unit on one side corresponds to the locking unit on the other side.

[0033] Specific implementation method three: refer to Figures 1 to 4 This embodiment is described. This embodiment further defines the positioning unit described in the second embodiment. The positioning unit described in this embodiment includes a positioning pin 1, a bushing 3, a centering beam body 4, a washer assembly and a positioning pin locking nut 7. A through hole No. 1 is processed on the centering beam body 4 at the location corresponding to the location of the positioning unit. The bushing 3 is embedded in the through hole No. 1. One end of the positioning pin 1 passes through the bushing 3 and is set in a positioning hole on the end wall 12 of the cylinder body close to one end of the bearing box or in a positioning hole on the side plate 11 of the bearing box. The positioning pin 1 is interference-fitted with the positioning hole. An external thread is processed on the outer cylindrical surface of the other end of the positioning pin 1. The positioning pin locking nut 7 is sleeved on the other end of the positioning pin 1. The positioning pin locking nut 7 is threadedly connected to the positioning pin 1. A washer assembly is provided between the positioning pin locking nut 7 and the centering beam body 4. The washer assembly is sleeved on the outer cylindrical surface of the positioning pin 1. Other components and connection methods are the same as those in the second embodiment.

[0034] Specific implementation method 4: refer to Figures 1 to 4This embodiment is described. This embodiment further defines the washer assembly described in the third embodiment. The washer assembly described in this embodiment includes a convex washer 5 and a concave washer 6. One end of the concave washer 6 is plugged into one end of the convex washer 5. The other end of the convex washer 5 is tightly fitted with the centering beam 4. The other end of the concave washer 6 is tightly fitted with the positioning pin locking nut 7. Other components and connection methods are the same as those in the third embodiment.

[0035] With such arrangement, the washer assembly formed by the cooperation of the convex washer 5 and the concave washer 6 can effectively expand in both directions, and can achieve effective tensioning while protecting the surface of the centering beam 4 .

[0036] Specific implementation method five: refer to Figures 1 to 4 This embodiment is described as further limiting the positioning pin 1 described in the fourth embodiment. In this embodiment, a drawing thread blind hole 8 is processed on the end surface of the other end of the positioning pin 1. Other components and connection methods are the same as those of the fourth embodiment.

[0037] In this arrangement, by processing the drawing threaded blind hole 8 and threading the drawing rod with the other end of the locating pin 1, when replacing the locating pin 1, the locating pin 1 with interference fit can be easily pulled out by pulling the drawing rod.

[0038] Specific implementation method six: refer to Figures 1 to 4 This embodiment is described. This embodiment further defines the locking unit described in the fifth embodiment. The locking unit described in this embodiment includes a stud 9 and a locking nut 10. A No. 2 through hole is processed on the centering beam 4 at the location corresponding to the setting of the locking unit. One end of the stud 9 passes through the centering beam 4 and is set in a threaded hole on the end wall 12 of the cylinder body close to the bearing box or a threaded hole on the side plate 11 of the bearing box. The stud 9 is threadedly connected to the threaded hole. The locking nut 10 is sleeved on the other end of the stud 9. The locking nut 10 is threadedly connected to the stud 9. A washer is provided between the locking nut 10 and the centering beam 4. The washer is sleeved on the outer circumferential surface of the stud 9. Other components and connection methods are the same as those in the fifth embodiment.

[0039] Specific implementation method seven: refer to Figures 1 to 4 This embodiment is described. This embodiment further limits the centering beam body 4 described in the sixth embodiment. In this embodiment, a gasket 2 is provided between the centering beam body 4 and the end wall 12 of the cylinder body close to the bearing box. A plurality of No. 3 through holes are evenly processed on the gasket 2. Each No. 3 through hole is correspondingly arranged with a positioning pin 1 or a stud 9. Other components and connection methods are the same as those of the sixth embodiment.

[0040] This embodiment summarizes that the axial installation dimensions of the centering beam are appropriate by measuring the distance between the cylinder and the bearing box and aligning the gasket 2.

[0041] Specific implementation method eight: refer to Figures 1 to 4 This embodiment is described. This embodiment further defines the adjustable support unit described in the seventh embodiment. The adjustable support unit described in this embodiment includes an adjusting gasket 15, a pressing block 16 and three bolt and nut mechanisms. The corresponding positions of the bearing box support plate 14 and each connecting cat claw 13 are processed with three mounting through holes. Each mounting through hole is arranged corresponding to a bolt and nut mechanism. The pressing block 16 is arranged above the bearing box support plate 14. The pressing block 16 is provided with a convex edge on the side close to the connecting cat claw 13. The convex edge and the pressing block 16 are integrally formed. The adjusting gasket 15 is arranged between the bearing box support plate 14 and the pressing block 16. The adjusting gasket 15, the pressing block 16 and the bearing box support plate 14 are fastened and connected by three bolt and nut mechanisms. The other end of the connecting cat claw 13 is arranged between the adjusting gasket 15 and the pressing block 16. The other end of the connecting cat claw 13 is clamped and fixed by the adjusting gasket 15 and the pressing block 16. Other components and connection methods are the same as those of the seventh embodiment.

[0042] In this embodiment, the thickness of the adjusting gasket 15, the upward lifting amount of the cylinder, and the upward offset of the centering beam are all calculated. The force on the centering beam in any process must be less than the required stress of the material, and a rubber layer is provided on the contact surface between the adjusting gasket 15 and the bearing box support plate 14 and the pressure block 16. The rubber layer can effectively absorb the displacement of the bearing box, making the connection structure more stable.

[0043] Specific implementation method nine: refer to Figures 1 to 4 This embodiment is described. This embodiment further defines the centering beam body 4 described in the eighth embodiment. The bolt and nut mechanism described in this embodiment includes a stud 17 and three mounting nuts 18. One end of the stud 17 passes through the pressure block 16, the adjustment gasket 15 and the bearing box support plate 14 in sequence and is arranged below the bearing box support plate 14. Two mounting nuts 18 are sleeved on one end of the stud 17, and the two mounting nuts 18 are threadedly connected to one end of the stud 17. The other end of the stud 17 is arranged above the pressure block 16. A mounting nut 18 is sleeved on the other end of the stud 17, and the mounting nut 18 is threadedly connected to the other end of the stud 17. The top of the pressure block 16 is processed with a countersunk hole, and the mounting nut 18 sleeved on the other end of the stud 17 is arranged in the countersunk hole. The other components and connection methods are the same as those of the eighth embodiment.

[0044] Specific implementation method ten: refer to Figures 1 to 4This embodiment is described. In this embodiment, a method for installing a connection structure between a cylinder body and a bearing box in a steam turbine is provided. The method is implemented by the following steps:

[0045] Step 1: Align the cylinder body in the steam turbine with the bearing box to be connected, so that each connecting claw 13 overlaps the connection on the bearing box support plate 14. In this process, the thickness of the adjustment gasket 15 can be adjusted according to the distance between the connecting claw 13 and the bearing box support plate 14; 2 groups of adjustment gaskets 15 should be prepared, one group with normal thickness alignment is recorded as A, and the other group is aligned according to the thickness thinner by 1.5mm and recorded as B (the thickness difference is the pre-bias amount). In this step, use the adjustment gasket 15 with a thickness of B to install it first.

[0046] Step 2: Set the centering beam 4 between the cylinder body and the bearing box to be connected, and position the centering beam 4 through N positioning units. One end of the locating pin 1 in each positioning unit passes through the centering beam 4 and is correspondingly set in the locating hole on the end wall 12 of the cylinder body close to the bearing box or the locating hole on the side plate 11 of the bearing box. The other end of the locating pin 1 is fixed to the centering beam 4 by the locating pin locking nut 7 to ensure the stability of the centering beam 4.

[0047] Step 3: Install the locking unit, and fasten the centering beam 4 and the end wall 12 of the cylinder body close to the bearing box and the side plate 11 of the bearing box through N locking units and N positioning units;

[0048] Step 4: Lift the cat claw 13 by a hydraulic jack, remove the adjusting gasket 15 with a thickness of B and install the adjusting gasket 15 with a thickness of A, and pre-tighten and fix the cat claw 13 with the adjusting gasket 15 with a thickness of A, the pressing block 16 and the bearing box support plate 14 by a bolt and nut mechanism;

[0049] Step 5: Install two additional bolt and nut mechanisms, and use three bolt and nut mechanisms to fasten the connecting cat claw 13 with the adjusting gasket 15 with a thickness of 15A, the pressure block 16 and the bearing box support plate 14, so as to achieve the fastening connection between the connecting cat claw 13 and the bearing box support plate 14, and complete the installation process of the cylinder body in the turbine and the bearing box to be connected.

[0050] The steam turbine used in this embodiment is the steam turbine of the Wenfeng 135MW project, which is an ultra-high temperature subcritical reaction back pressure machine. Due to the large power of the unit and the light weight of the static parts, when the unit is in normal operation, according to the static parts weight calculation of the load diagram, without considering the interface force and moment of the design institute, the cylinder stability margin is very small, and the stability margin of the unit's high-pressure cylinder is only 8.4% (the qualified stability standard is that the stability margin is greater than 10%). Among them, the lifting force of the centering beam on the cylinder is about 2.43t, which will have an adverse effect on the stability of the cylinder. By implementing the scheme of the present invention, the expansion difference at both ends of the centering beam of the unit can be reduced under normal operation, thereby reducing the expansion force of the centering beam on the cylinder, which is beneficial to the stability of the cylinder. Without considering the external interface force and moment of the design institute, the thermal stability margin of the high-pressure cylinder of this project before the centering beam is pre-biased by 1.5mm is 8.4%; after the pre-bias is 1.5mm, the thermal stability margin of the high-pressure cylinder is 21.3%. According to relevant assessment standards, the standard for qualified cylinder stability is that the stability margin is greater than 10%, so the solution of the present invention is more beneficial to the stability of the cylinder.

[0051] The present invention has been disclosed as above with preferred implementation cases, but it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A connection structure between a cylinder body and a bearing box in a steam turbine, characterized in that: The connection structure comprises a centering beam assembly and two connecting cat claws (13); the centering beam assembly is arranged between the cylinder body and the bearing box; one end of the centering beam assembly is detachably connected to an end wall (12) of the cylinder body close to the bearing box; the other end of the centering beam assembly is detachably connected to a side plate (11) of the bearing box; the two connecting cat claws (13) are symmetrically arranged on both sides of the centering beam assembly; one end of each connecting cat claw (13) is integrally formed with an end wall (12) of the cylinder body close to the bearing box; and the other end of each connecting cat claw (13) is detachably connected to a bearing box support plate (14) via an adjustable support unit; The centering beam assembly comprises a centering beam body (4) and two disassembly connection mechanism groups, each of which is arranged on one end of the centering beam body (4), one end of the centering beam body (4) is disassembly connected to an end wall (12) of a cylinder body close to one end of a bearing box through one disassembly connection mechanism group, and the other end of the centering beam body (4) is disassembly connected to a side plate (11) of the bearing box through another disassembly connection mechanism group; The disassembly connection mechanism group comprises N disassembly connection mechanisms, N being a positive integer, and the N disassembly connection mechanisms being arranged at equal distances at the ends of the centering beam body (4) along the width direction of the centering beam body (4); The disassembly connection mechanism includes a positioning unit and a locking unit, and the positioning unit and the locking unit are arranged opposite to each other up and down; The centering beam body (4) is a pre-biased centering beam structure; The positioning unit comprises a positioning pin (1), a bushing (3), a washer assembly and a positioning pin locking nut (7); a through hole No. 1 is processed at a position corresponding to the positioning unit on the centering beam (4); the bushing (3) is embedded in the through hole No. 1; one end of the positioning pin (1) passes through the bushing (3) and is arranged in a positioning hole on an end wall (12) of the cylinder body close to the bearing box or a positioning hole on a side plate (11) of the bearing box; the positioning pin (1) and the positioning hole are arranged in an interference fit; an external thread is processed on the outer cylindrical surface of the other end of the positioning pin (1); the positioning pin locking nut (7) is sleeved on the other end of the positioning pin (1); the positioning pin locking nut (7) is threadedly connected to the positioning pin (1); a washer assembly is provided between the positioning pin locking nut (7) and the centering beam (4); the washer assembly is sleeved on the outer cylindrical surface of the positioning pin (1); The adjustable support unit comprises an adjusting gasket (15), a pressing block (16) and three bolt and nut mechanisms. Three mounting through holes are processed at corresponding positions of the bearing box support plate (14) and each connecting cat claw (13). Each mounting through hole is arranged corresponding to a bolt and nut mechanism. The pressing block (16) is arranged above the bearing box support plate (14). A convex edge is arranged on a side of the pressing block (16) close to the connecting cat claw (13). The convex edge and the pressing block (16) are integrally formed. The adjusting gasket (15) is arranged between the bearing box support plate (14) and the pressing block (16). The adjusting gasket (15), the pressing block (16) and the bearing box support plate (14) are fastened and connected by the three bolt and nut mechanisms. The other end of the connecting cat claw (13) is arranged between the adjusting gasket (15) and the pressing block (16). The other end of the connecting cat claw (13) is clamped and fixed by the adjusting gasket (15) and the pressing block (16).

2. The connection structure between a cylinder body and a bearing box in a steam turbine according to claim 1, characterized in that: The washer assembly comprises a convex washer (5) and a concave washer (6); one end of the concave washer (6) is plugged into one end of the convex washer (5); the other end of the convex washer (5) is tightly fitted with the centering beam (4); and the other end of the concave washer (6) is tightly fitted with the positioning pin locking nut (7).

3. The connection structure between a cylinder body and a bearing box in a steam turbine according to claim 2, characterized in that: A drawing thread blind hole (8) is machined on the end surface of the other end of the positioning pin (1).

4. The connection structure between a cylinder body and a bearing box in a steam turbine according to claim 3, characterized in that: The locking unit comprises a stud (9) and a locking nut (10); a second through hole is processed at a position corresponding to the setting position of the locking unit on the centering beam (4); one end of the stud (9) passes through the centering beam (4) and is set in a threaded hole on an end wall (12) of the cylinder body close to the bearing box or a threaded hole on a side plate (11) of the bearing box, and the stud (9) is threadedly connected to the threaded hole; the locking nut (10) is sleeved on the other end of the stud (9); the locking nut (10) is threadedly connected to the stud (9); a washer is provided between the locking nut (10) and the centering beam (4); the washer is sleeved on the outer circumferential surface of the stud (9).

5. The connection structure between a cylinder body and a bearing box in a steam turbine according to claim 4, characterized in that: A gasket (2) is provided between the centering beam (4) and an end wall (12) of the cylinder body close to the bearing box. A plurality of No. 3 through holes are evenly distributed on the gasket (2), and each No. 3 through hole is provided corresponding to a positioning pin (1) or a stud (9).

6. The connection structure between a cylinder body and a bearing box in a steam turbine according to claim 5, characterized in that: The bolt and nut mechanism comprises a stud (17) and three mounting nuts (18); one end of the stud (17) passes through the pressing block (16), the adjusting gasket (15) and the bearing box support plate (14) in sequence and is arranged below the bearing box support plate (14); two mounting nuts (18) are sleeved on one end of the stud (17), and the two mounting nuts (18) are threadedly connected to one end of the stud (17); the other end of the stud (17) is arranged above the pressing block (16); a mounting nut (18) is sleeved on the other end of the stud (17), and the mounting nut (18) is threadedly connected to the other end of the stud (17); a countersunk hole is processed on the top of the pressing block (16), and the mounting nut (18) sleeved on the other end of the stud (17) is arranged in the countersunk hole.

7. A method for installing the connection structure between a cylinder block and a bearing box in a steam turbine according to any one of claims 1 to 6, characterized in that: The method is achieved by the following steps: Step 1: Align the cylinder body in the steam turbine with the bearing box to be connected so that each connecting claw (13) overlaps the connection on the bearing box support plate (14) correspondingly. In this process, the thickness of the adjusting gasket (15) can be aligned according to the spacing between the connecting claw (13) and the bearing box support plate (14); two sets of adjusting gaskets (15) should be prepared, one set with normal thickness alignment is marked as A, and the other set with thickness thinner by 1.5 mm is marked as B. In this step, the adjusting gaskets (15) with thickness B are used for installation first; Step 2: The centering beam (4) is arranged between the cylinder body and the bearing box to be connected, and the centering beam (4) is positioned by means of N positioning units, one end of the positioning pin (1) in each positioning unit passes through the centering beam (4) and is correspondingly arranged in a positioning hole on an end wall (12) of the cylinder body close to the bearing box or a positioning hole on a side plate (11) of the bearing box, and the other end of the positioning pin (1) is fixed to the centering beam (4) by a positioning pin locking nut (7) to ensure the stability of the centering beam (4); Step 3: Install the locking unit, and fasten the centering beam (4) and the end wall (12) of the cylinder body close to the bearing box and the side plate (11) of the bearing box through N locking units and N positioning units; Step 4: Lift the cat claw (13) by a hydraulic jack, remove the adjusting gasket (15) with a thickness of B and install the adjusting gasket (15) with a thickness of A, and pre-tighten and fix the cat claw (13) with the adjusting gasket (15) with a thickness of A, the pressure block (16) and the bearing box support plate (14) by a bolt and nut mechanism; Step 5: Install two additional bolt and nut mechanisms, and use the three bolt and nut mechanisms to fasten the connecting claw (13) with the adjustment gasket (15) with a thickness of A, the pressure block (16) and the bearing box support plate (14), thereby achieving a fastened connection between the connecting claw (13) and the bearing box support plate (14), and completing the installation process of the cylinder body in the turbine and the bearing box to be connected.

Images