A method for assembling lifting rings for welding casing of centrifugal compressor

Abstract

The present invention discloses a method for assembling a lifting ring for a welded casing of a centrifugal compressor, comprising determining the placement position and positioning angle of the lifting ring according to the structure of the welded casing; performing a mechanical analysis on the welded casing in a hoisted state according to the positioning angle, and outputting a lifting ring dimension parameter table; the lifting ring dimension parameter table includes the weight of the welded casing, and the lifting ring diameter, lifting ring fillet radius, lifting ring thickness, and the minimum distance between the lifting ring and the outer wall of the welded casing corresponding to the weight of the welded casing; connecting the lifting ring to the welded casing according to the positioning angle and the dimension parameter table to complete the assembly of the lifting ring on the welded casing. The method for assembling a lifting ring for a welded casing of a centrifugal compressor provided by the present invention designs lifting rings for various types of centrifugal compressor casings according to the positioning angle of the lifting ring and the dimension parameter table, so that the lifting ring placement position is reasonable and meets the strength requirements, and the lifting ring parameter table has good versatility and meets the standardization requirements for the design of lifting rings for various types of compressor casings.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal compressors, in particular to a method for assembling a lifting ring of a welded casing of a centrifugal compressor. Background Art

[0002] During the welding and processing of the centrifugal compressor welded casing, in order to meet the position requirements of flat welding, horizontal welding, and other work requirements, as well as processing and flipping, the welded casing needs to be hoisted or flipped as necessary. At the same time, combined with the horizontal position of the welded casing, the welded casing needs to be placed in accordance with the welding requirements, including sideways placement and upright placement.

[0003] In the actual production process, there are no relevant operating standards for the lifting, flipping and placement of the welded casing. Construction workers often rely on their experience to weld the lifting rings, lack reasonable strength calculations and the proper location of the lifting rings, and there are safety hazards that violate safety operating procedures.

[0004] Therefore, a hoisting and assembly method for the welded casing of a centrifugal compressor that can reasonably place the lifting ring position and meet the strength requirements is in urgent need of research. Summary of the Invention

[0005] In response to the above-mentioned shortcomings of the prior art, the present invention provides a method for assembling lifting rings for a welded casing of a centrifugal compressor, which solves the problem in the prior art that construction workers weld casing lifting rings based on experience, resulting in unreasonable lifting ring positions and substandard strength.

[0006] The present invention provides a method for assembling a lifting ring of a welded casing of a centrifugal compressor, comprising:

[0007] Determine the placement position of the lifting ring on the welding housing according to the structure of the welding housing, and determine the positioning angle of the lifting ring on the welding housing;

[0008] Performing a mechanical analysis of the welded housing in a hoisted state based on the positioning angle of the hoist ring and outputting a dimension parameter table of the hoist ring; wherein the dimension parameter table of the hoist ring includes the weight of the welded housing, and corresponding values of the diameter of the hoist ring, the fillet radius of the hoist ring, the thickness of the hoist ring, and the minimum distance between the hoist ring and the outer wall of the welded housing;

[0009] According to the positioning angle of the lifting ring and the size parameter table of the lifting ring, the lifting ring is connected to the welding housing to complete the assembly of the lifting ring on the welding housing.

[0010] Furthermore, the welding housing includes an upper housing and a lower housing, the lifting ring includes an upper housing lifting ring and a lower housing lifting ring, and the placement position of the lifting ring on the welding housing includes:

[0011] The upper casing lifting rings are located at both ends of the upper casing;

[0012] The lower casing lifting ring is located in the middle of the lower casing.

[0013] Furthermore, the placement position of the lifting ring on the welding housing also includes:

[0014] The edge of the upper casing hanging ring is not higher than the edge of the upper casing.

[0015] Furthermore, the positioning angle of the lifting ring on the welding housing includes:

[0016] The angle between the upper casing lifting ring and the horizontal plane of the upper casing is 30° to 35°;

[0017] The included angle between the lower casing lifting ring and the vertical direction of the lower casing horizontal plane is 30° to 45°.

[0018] Furthermore, the mechanical analysis of the welded casing in the hoisting state includes:

[0019] Determining the dangerous cross section of the lifting ring and calculating the area of the dangerous cross section;

[0020] Performing a force analysis on the lifting ring according to the area of the dangerous section to obtain the shear stress on the lifting ring;

[0021] determining the yield strength of the welded housing according to the material of the welded housing;

[0022] The obtained shear stress on the lifting ring is compared with the yield strength of the welded casing to determine that the lifting ring meets the yield strength requirement.

[0023] Furthermore, the size parameter table of the lifting ring also includes:

[0024] The weight of the upper casing of the welded casing, and the vertical distance between the edge of the lifting ring and the edge of the upper casing corresponding to the weight of the upper casing.

[0025] Furthermore, the step of connecting the lifting ring to the welding housing includes:

[0026] Opening lifting ring holes on a plurality of lifting ring plates according to the size parameter table of the lifting rings, and welding the plurality of lifting ring plates to the upper casing of the welded casing according to the positioning angles of the lifting rings to form a plurality of upper casing lifting rings;

[0027] According to the size parameter table of the lifting ring and the positioning angle of the lifting ring, holes are opened on the lower casing rib plate of the welded casing to form a plurality of lower casing lifting rings.

[0028] Furthermore, the step of connecting the lifting ring to the welding housing includes:

[0029] According to the size parameter table of the lifting ring and the positioning angle of the lifting ring, holes are drilled in the upper casing rib plate of the welded casing to form a plurality of upper casing lifting rings;

[0030] According to the size parameter table of the lifting ring and the positioning angle of the lifting ring, holes are opened on the lower casing rib plate of the welded casing to form a plurality of lower casing lifting rings.

[0031] Furthermore, the step of connecting the lifting ring to the welding housing further comprises:

[0032] The plurality of upper casing lifting rings are distributed at both ends of the upper casing in an axial direction and are symmetrically arranged on both sides of the upper casing;

[0033] A plurality of lower casing hanging rings are symmetrically arranged on the ribs on both sides of the lower casing.

[0034] Furthermore, the lifting ring assembly method for the centrifugal compressor welded casing further comprises:

[0035] According to the size parameter table of the lifting ring, design lifting rings of various casings for centrifugal compressors with different structures;

[0036] Tests are conducted on the lifting rings of the various types of housings to verify the safety and rationality of the lifting ring assembly methods.

[0037] The present invention provides a method for assembling lifting rings for a welded casing of a centrifugal compressor. The method determines the placement position of the lifting ring according to the structure of the welded casing to determine the positioning angle of the lifting ring on the welded casing, and performs a mechanical analysis on the welded casing in a hoisted state according to the positioning angle to output a size parameter table of the lifting ring. Finally, according to the positioning angle of the lifting ring and the size parameter table, lifting rings for various types of centrifugal compressor casings are designed, so that the placement position of the lifting ring is reasonable and meets the strength requirements. The lifting ring parameter table has good versatility and meets the standardization requirements for the design of lifting rings for various types of compressor casings.

[0038] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0039] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0041] Figure 1 Flowchart of the method for assembling the lifting rings for welding the casing of a centrifugal compressor;

[0042] Figure 2 The actual size parameter diagram of the upper casing lifting ring of the centrifugal compressor welding casing;

[0043] Figure 3 The actual size parameter diagram of the lower casing lifting ring of the centrifugal compressor welded casing;

[0044] Figure 4 A cross-sectional view of the lifting ring for welding the casing of a centrifugal compressor;

[0045] Figure 5 This is the position diagram of the upper casing lifting ring on the welded casing;

[0046] Figure 6 This is the position diagram of the lower casing lifting ring on the welded casing lower casing;

[0047] Figure 7 This is the ideal state diagram for hoisting the upper casing;

[0048] Figure 8 Flowchart for mechanical analysis of welded casing;

[0049] Figure 9 This is the dimension parameter table of the upper casing lifting ring;

[0050] Figure 10 This is the dimension parameter table of the lower casing lifting ring.

[0051] In the picture:

[0052] 1-upper casing lifting ring, 2-upper casing, 3-lower casing lifting ring, 4-lower casing;

[0053] α-the positioning angle of the lifting ring, a-the vertical distance between the edge of the lifting ring and the edge of the casing, φ-the diameter of the lifting ring hole, R-the fillet of the lifting ring, d-the minimum distance between the lifting ring and the outer wall, D-the thickness of the lifting ring. DETAILED DESCRIPTION

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] The present invention provides a method for assembling a lifting ring of a welded casing of a centrifugal compressor. Figure 1 , including analyzing the structure of the welded casing and determining the positioning angle of the lifting ring on the welded casing; according to the positioning angle of the lifting ring, conducting a mechanical analysis of the welded casing in the hoisting state and outputting the size parameter table of the lifting ring; see Figure 9 and Figure 10 The size parameter table of the lifting ring includes the weight of the welding casing, and the diameter of the lifting ring corresponding to the weight of the welding casing, the fillet radius of the lifting ring, the thickness of the lifting ring and the minimum distance between the lifting ring and the outer wall of the welding casing; according to the positioning angle of the lifting ring and the size parameter table of the lifting ring, the lifting ring is connected to the welding casing to complete the assembly of the lifting ring on the welding casing.

[0058] The present invention provides a method for assembling lifting rings for a welded casing of a centrifugal compressor. The method determines the placement position of the lifting ring according to the structure of the welded casing to determine the positioning angle of the lifting ring on the welded casing, and performs a mechanical analysis on the welded casing in a hoisted state according to the positioning angle to output a size parameter table of the lifting ring. Finally, according to the positioning angle of the lifting ring and the size parameter table, lifting rings for various types of centrifugal compressor casings are designed, so that the placement position of the lifting ring is reasonable and meets the strength requirements. The lifting ring parameter table has good versatility and meets the standardization requirements for the design of lifting rings for various types of compressor casings.

[0059] Specifically, in the above embodiment, the welding casing includes an upper casing 2 and a lower casing 4, and the lifting rings include an upper casing lifting ring 1 and a lower casing lifting ring 3. The placement positions of the lifting rings on the welding casing include the upper casing lifting ring 1 being located at both ends of the upper casing 2; and the lower casing lifting ring 3 being located in the middle position of the lower casing 4.

[0060] In this embodiment, when the upper housing 2 is turned over, the upper housing 2 is lifted and ideally Figure 7 As shown, it is easier to flip the upper casing 2 by using two hooks to lift it at the same time. One hook lifts the lifting column on the horizontal plane of the upper casing 2, and the other hook lifts the upper casing lifting ring 1 to ensure the stability of the flipping of the upper casing 2. Since the end plates on both sides of the upper casing 2 are relatively rigid, no plastic deformation will occur when lifting the end plates on both sides of the upper casing 2. Therefore, the upper casing lifting ring 1 is arranged at both ends of the upper casing 2.

[0061] When the lower casing 4 is turned over vertically, the two hooks can be used to simultaneously hang the lower casing lifting ring 3 . Therefore, arranging the lower casing lifting ring 3 in the middle of the lower casing 4 can ensure the stability of the lower casing 4 when it is turned over vertically.

[0062] Furthermore, the placement position of the lifting ring on the welded casing also includes that the edge of the upper casing lifting ring 1 is not higher than the edge of the upper casing 2.

[0063] Furthermore, the positioning angles of the lifting rings on the welded casing include a horizontal plane angle of 30° to 35° between the upper casing lifting ring 1 and the upper casing 2; and a vertical angle of 30° to 45° between the lower casing lifting ring 3 and the horizontal plane of the lower casing 4.

[0064] In this embodiment, when the upper casing 2 is flipped sideways using the upper casing lifting ring 1, on the one hand, in combination with the center of gravity position and structural form of the upper casing 2, in order to ensure the stability of flipping the upper casing 2 and the convenience of operation, it is necessary to ensure that the upper casing lifting ring 1 and the horizontal plane of the upper casing 2 are both located on the same side of the center of gravity of the upper casing 2. Therefore, the angle between the upper casing lifting ring 1 and the horizontal plane of the upper casing 2 cannot be too large, and the angle of the angle must be less than or equal to 35°. On the other hand, it is also necessary to avoid the angle between the upper casing lifting ring 1 and the horizontal plane of the upper casing 2 being too small. For example, when the angle is less than 30°, the edge of the upper casing lifting ring 1 is higher than the edge of the shell plate of the upper casing 2, which will affect subsequent processing. Therefore, the angle α between the upper casing lifting ring 1 and the horizontal plane of the upper casing 2 can be determined to be 30~35°.

[0065] When the lower casing 4 is turned upright using the lower casing lifting ring 3, the lower casing lifting ring 3 is located in the middle of the lower casing 4. When the vertical angle between the lower casing lifting ring 3 and the horizontal plane of the lower casing 4 is 30-45°, the lifting requirements for the lower casing 4 are met.

[0066] Specifically, in the above embodiment, the mechanical analysis of the welded casing in the hoisting state includes determining the dangerous section of the lifting ring and calculating the area of the dangerous section; performing a force analysis on the lifting ring according to the area of the dangerous section to obtain the shear stress on the lifting ring; determining the yield strength of the welded casing according to the material of the welded casing; and comparing the obtained shear stress on the lifting ring with the yield strength of the welded casing to determine whether the lifting ring meets the yield strength requirements.

[0067] In this embodiment, see Figure 8, first, determine that the dangerous section of the casing lifting ring during the lifting process is the shear plane between the lifting ring and the lifting tool during the lifting process. Then the shear area S = the thickness D of the lifting ring plate * the minimum distance d between the lifting ring and the outer wall; second, during the lifting of the welded casing, according to the operation specification requirements, analyze the force on the upper casing 2: G = 2Fcos(θ / 2), where F is the tension of the steel wire rope. From this, it can be obtained that 0.5 < F / G < 0.71. At the same time, consider other factors such as the dynamic load coefficient, including extreme working conditions such as the loosening and failure of the lifting ring during the lifting process. Therefore, the mechanical analysis and calculation of the lifting ring can be simplified to the calculation of the lifting ring under extreme working conditions; then, the commonly used welded casing materials at present are Q345R and 09MnNIDR. When the welded casing is made of Q345R steel plate, in accordance with the national standard of GB / T 713-2014 "Steel Plates for Boilers and Pressure Vessels", when the thickness of the casing is no more than 100 mm, its yield strength ≥ 305 MPa; when the welded casing is made of 09MnNIDR steel plate, in accordance with the national standard of GB / T 3531-2014 "Steel Plates for Low-temperature Pressure Vessels", when the thickness of the casing is no more than 120 mm, the yield strength ≥ 260 Mpa. Since the thickness of the lifting ring in this application is not more than 100 mm, the minimum yield strength value is taken as 260 MPa; finally, since the lifting ring is a closed structure during the force application process, only the shear stress on the lifting ring needs to be considered in the force analysis. According to the calculation formula, the shear stress τ on the lifting ring = F / A, where A = the thickness D of the lifting ring plate * the minimum distance d between the edge of the lifting ring hole and the outer wall, and the material anti-shear performance evaluation index is 0.3 times the yield strength value, that is, τ = material yield strength * 0.3. Also, F = G = Mg, where M is the weight of the casing in tons (t), g is the gravitational acceleration 9.8, and the units of D and d are both millimeters (mm). From this, it can be obtained that under extreme working conditions: D*d = M*80.3. In summary, when D*d ≥ M*80.3, the lifting ring can meet the yield strength requirements. Considering the standardized design of the welded casing, the casing weight M is divided into 4 grades, namely 0-10 (t), 10 (t)-25 (t), 25 (t)-55 (t), and above 55 (t). Through formula transformation, the product of D*d can be obtained, and then the values of D and d can be determined according to the actual structure and size of the lifting ring.

[0068] Specifically, in the above embodiment, the dimension parameter table of the lifting ring further includes the weight of the upper casing 2 of the welded casing, and the vertical distance between the edge of the lifting ring and the edge of the upper casing 2 corresponding to the weight of the upper casing 2.

[0069] In this embodiment, refer to Figures 2 to 4Among the dimensional parameters that need to be confirmed for the upper casing lifting ring 1, first, the positioning angle α of the upper casing lifting ring 1 has been determined to be in the range of 30° to 35°. Second, to meet subsequent processing requirements, the edge of the lifting ring plate does not protrude above the edge of the upper casing 2. The vertical distance a between the edge of the upper casing lifting ring 1 and the edge of the upper casing 2 is ≥ 10mm, preferably 10mm to 50mm. Then, the ultimate shear stress F of a single lifting ring is calculated based on the casing weight. The appropriate shackle is selected to match the lifting ring with the reference to the national standard GB / T 25854-2010 "D-shaped and bow-shaped forged shackles for general lifting". The diameter φ of the upper casing lifting ring 1 is determined based on the diameter of the shackle body. Finally, to ensure the rotation of the lifting ring shackle, the lifting ring radius R is specified based on the structure and size of the lifting ring.

[0070] The dimensional parameters that need to be confirmed for the lower casing lifting ring 3 are determined in the same way as for the upper casing lifting ring 1. The ultimate shear stress F of a single lifting ring is calculated based on the weight of the lower casing 4. The appropriate shackle is selected by referring to the national standard GB / T 25854-2010, "D-shaped and bow-shaped forged shackles for general lifting." The diameter φ of the lower casing lifting ring 3 is determined based on the diameter of the shackle body. Secondly, to ensure the rotation of the lower casing lifting ring 3 shackle, the lifting ring radius R is specified based on the structure and size of the lifting ring.

[0071] Specifically, in the above embodiment, connecting the lifting ring to the welded casing includes opening lifting ring holes on multiple lifting ring plates according to the lifting ring size parameter table, and welding the multiple lifting ring plates to the upper casing 2 of the welded casing according to the positioning angles of the lifting rings, thereby forming multiple upper casing lifting rings 1; and drilling holes in the ribs of the lower casing 4 of the welded casing according to the lifting ring size parameter table and the positioning angles of the lifting rings, thereby forming multiple lower casing lifting rings 3. In this embodiment, since the upper casing lifting rings 1 are arranged at both ends of the upper casing 2, the holes can be directly drilled using the ribs at both axial ends of the upper casing 2; since the lower casing lifting rings 3 are arranged in the middle of the lower casing 4, the holes can be directly drilled using the ribs in the middle of the lower casing 4. Directly drilling holes using the ribs on the welded casing to create the lifting rings provides a stable structure and facilitates operation.

[0072] Specifically, in the above embodiment, holes are drilled in the ribs of the welded upper casing 2 according to the lifting ring dimension parameter table and the positioning angles of the lifting rings to form a plurality of upper casing lifting rings 1; and holes are drilled in the ribs of the welded lower casing 4 according to the lifting ring dimension parameter table and the positioning angles of the lifting rings to form a plurality of lower casing lifting rings 3. In this embodiment, holes can also be drilled in the lifting ring plate, and then the plurality of lifting ring plates with holes drilled can be symmetrically welded to the axial ends of the upper casing 2, which can also ensure that plastic deformation does not occur when the upper casing 2 is lifted.

[0073] For further information, see Figure 5 and Figure 6The lifting rings connected to the welded housing further comprise multiple upper housing lifting rings 1 distributed symmetrically at both ends of the upper housing 2 in the axial direction; and multiple lower housing lifting rings 3 symmetrically disposed on the ribs on both sides of the lower housing 4. In this embodiment, at least four upper housing lifting rings 1 are evenly distributed at both ends of the upper housing 2 in the axial direction and symmetrically disposed on both sides of the upper housing 2; and at least two lower housing lifting rings 3 are provided on either side of the axial center of the lower housing 4. The lifting ring holes are provided based on the different usage requirements of the upper and lower housings 2 and 4, making the design structure more reasonable and avoiding waste.

[0074] Furthermore, the method for assembling lifting rings for a welded centrifugal compressor casing further includes: designing lifting rings for various types of centrifugal compressor casings of different structures based on a lifting ring dimension parameter table; and testing the lifting rings for various types of casings to verify the safety and rationality of the lifting ring assembly method. In this embodiment, lifting rings are designed for centrifugal compressors of different structures based on a lifting ring parameter table for upper casing 2 and lower casing 4 of different weight ranges, thereby achieving serialization and standardization of the entire process of lifting, flipping, and placing the centrifugal compressor casing. The designed lifting ring products are then tested and verified to ensure the safety and stability of various types of casings during the lifting process, thereby reducing the probability of accidents.

[0075] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for assembling a lifting ring of a welded casing of a centrifugal compressor, characterized in that: include: Determine the placement position of the lifting ring on the welding housing according to the structure of the welding housing, and determine the positioning angle of the lifting ring on the welding housing; Performing a mechanical analysis of the welded housing in a hoisted state based on the positioning angle of the hoist ring and outputting a dimension parameter table of the hoist ring; wherein the dimension parameter table of the hoist ring includes the weight of the welded housing, and corresponding values of the diameter of the hoist ring, the fillet radius of the hoist ring, the thickness of the hoist ring, and the minimum distance between the hoist ring and the outer wall of the welded housing; According to the positioning angle of the lifting ring and the size parameter table of the lifting ring, the lifting ring is connected to the welding housing to complete the assembly of the lifting ring on the welding housing; The method of connecting the lifting ring to the welding housing according to the positioning angle of the lifting ring and the size parameter table of the lifting ring comprises: Opening a plurality of lifting ring holes on a plurality of lifting ring plates according to the size parameter table of the lifting rings, and welding the plurality of lifting ring plates to the upper casing of the welded casing according to the positioning angles of the lifting rings to form a plurality of upper casing lifting rings, or opening holes in the upper casing rib plate of the welded casing according to the size parameter table of the lifting rings and the positioning angles of the lifting rings to form a plurality of upper casing lifting rings; According to the size parameter table of the lifting ring and the positioning angle of the lifting ring, holes are drilled in the lower casing rib plate of the welded casing to form a plurality of lower casing lifting rings; The welding housing includes an upper housing and a lower housing, the lifting ring includes an upper housing lifting ring and a lower housing lifting ring, and the placement position of the lifting ring on the welding housing includes: The upper casing lifting rings are located at both ends of the upper casing; The lower casing lifting ring is located in the middle of the lower casing.

2. The method for assembling the lifting ring of the centrifugal compressor welding casing according to claim 1, characterized in that: The placement position of the lifting ring on the welding housing also includes: The edge of the upper casing hanging ring is not higher than the edge of the upper casing.

3. The method for assembling the lifting ring of the centrifugal compressor welding casing according to claim 2, characterized in that: The positioning angles of the lifting ring on the welding housing include: The angle between the upper casing lifting ring and the horizontal plane of the upper casing is 30° to 35°; The included angle between the lower casing lifting ring and the vertical direction of the lower casing horizontal plane is 30° to 45°.

4. The method for assembling a lifting ring of a centrifugal compressor welded casing according to claim 1, characterized in that: The mechanical analysis of the welded casing in the hoisting state includes: Determining the dangerous cross section of the lifting ring and calculating the area of the dangerous cross section; Performing a force analysis on the lifting ring according to the area of the dangerous section to obtain the shear stress on the lifting ring; determining the yield strength of the welded housing according to the material of the welded housing; The obtained shear stress on the lifting ring is compared with the yield strength of the welded casing to determine that the lifting ring meets the yield strength requirement.

5. The method for assembling the lifting ring of the welded casing of a centrifugal compressor according to claim 1, characterized in that: The size parameter table of the lifting ring also includes: The weight of the upper casing of the welded casing, and the vertical distance between the edge of the lifting ring and the edge of the upper casing corresponding to the weight of the upper casing.

6. The method for assembling the lifting ring of the welded casing of a centrifugal compressor according to claim 1, characterized in that: Connecting the lifting ring to the welding housing also includes: The plurality of upper casing lifting rings are distributed at both ends of the upper casing in an axial direction and are symmetrically arranged on both sides of the upper casing; A plurality of lower casing hanging rings are symmetrically arranged on the ribs on both sides of the lower casing.

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