Compressor with cast-weld combined sectional type cylinder body and machining and manufacturing method

Abstract

The invention discloses a compressor with cast-weld combined sectional type cylinder bodies and a machining and manufacturing method, and belongs to the technical field of structural design and machining and manufacturing of compressor cylinder bodies of compressed air energy storage systems. The compressor cylinder body is divided into a plurality of structural sections, the axial flow air inlet machine shell, the axial flow section machine shell and the centrifugal air inlet machine shell adopt the welding technology, the centrifugal volute adopts the casting technology, the advantages of the two technologies of cast welding are combined, and the high pneumatic performance and the high manufacturing efficiency of the cylinder body are achieved. And the cylinder body sections are connected through flanges, so that good air tightness and stability are ensured. Through rough machining, finish machining, quality detection and the like, the size precision, the pneumatic performance and the structural strength of the compressor cylinder body are guaranteed. And meanwhile, a segmented manufacturing process is adopted, so that each segment of the cylinder body can be independently manufactured, pretreated and assembled, and the production efficiency and the machining precision are improved. While the manufacturing efficiency is improved and the production cost is reduced, the safe and reliable operation of the compressor cylinder body in a high-pressure environment is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of compressed air energy storage compressors, and relates to the design and manufacturing process optimization of compressor cylinder blocks. Specifically, it is a compressor with a cast-weld combined segmented cylinder block and a manufacturing method thereof. Background Art

[0002] With the transformation of the energy structure and the development of new energy, compressed air energy storage technology, as an important large-scale energy storage method, the performance and manufacturing cost of its core equipment - the compressor directly affect the economy and reliability of the entire system. The cylinder block, as a key component for carrying the air flow channel and maintaining the internal pressure, its design and manufacturing process have a decisive impact on the aerodynamic performance, structural strength, etc. of the compressor.

[0003] Currently, in the design of compressor cylinder blocks, mainly two common methods of integral casting or integral welding are adopted. The integral casting cylinder block is formed by one-time casting, which can accurately shape the aerodynamic profile of the compressor, ensure the smooth continuity and precise geometric shape of the air flow channel, and thus obtain higher aerodynamic efficiency. However, its processing cost is high and the manufacturing difficulty is large. Especially for the compressor units applied to large-scale compressed air energy storage systems, due to the large size of the units, it further increases the processing difficulty and manufacturing cycle.

[0004] In contrast, the integral welding cylinder block is manufactured by processes such as steel plate cutting, bending, and welding. Its processing cost is relatively low, especially suitable for the production of small and medium-sized compressor units. However, for parts with complex air flow paths, such as variable cross-section curve structures like the volute or diffuser of a centrifugal compressor, due to the use of plate welding, it is difficult to accurately shape the ideal aerodynamic profile and cannot well guarantee the aerodynamic performance. In addition, welding stress concentration may also cause the risk of structural fatigue failure. For example, Chinese Utility Model Patent CN201582217U discloses a segmented welded structure axial flow compressor casing. This scheme divides the axial flow compressor casing into multiple segments for welding and connects them through flange bolts. Although this scheme reduces the manufacturing difficulty and weight of the casing to a certain extent, it is only applicable to axial flow compressors and all adopt welding processes, unable to meet the accuracy requirements of the complex profile in the centrifugal section, and does not solve the deformation problem caused by welding stress, and still has deficiencies in aerodynamic performance.

[0005] In practical applications, no matter which process is adopted, the processing of large compressor cylinder blocks faces huge challenges. The integral casting cylinder block requires ultra-large casting equipment and precision machining equipment, and once there are quality problems in casting, the entire cylinder block needs to be remanufactured, resulting in huge waste of time and materials. While the integral welding cylinder block has higher manufacturing flexibility, it is difficult to reach the ideal aerodynamic performance index at complex air flow channels, especially for axial-flow centrifugal combined compressors, this performance degradation is more obvious.

[0006] In summary, in the field of large compressed air energy storage compressors, the existing integral casting or integral welding cylinder body processes cannot simultaneously meet the requirements of high aerodynamic performance and economical manufacturing. Therefore, how to reduce the manufacturing difficulty, shorten the manufacturing cycle and reduce the manufacturing cost while ensuring the aerodynamic performance of the compressor is a technical problem that needs to be urgently solved in the field of compressor design and manufacturing. Summary of the Invention

[0007] (1) Purpose of the invention

[0008] In response to the aforementioned shortcomings and deficiencies of the prior art, the present invention aims to provide a compressor with a cast-welded segmented cylinder block and its manufacturing method. Based on the unique characteristics of the compressor's aerodynamic design, the present invention utilizes different manufacturing processes for the compressor cylinder block. The axial flow section of the compressor features relatively straight streamlines and is welded, while the centrifugal section utilizes a cast volute. This ensures aerodynamic performance while reducing manufacturing complexity, shortening the manufacturing cycle, and lowering processing costs.

[0009] (2) Technical solution

[0010] In order to achieve the purpose of the invention and solve the technical problems, the present invention adopts the following technical solutions:

[0011] The first object of the present invention is to provide a compressor with a cast-welded segmented cylinder body for multi-stage compression of gas in a large-scale compressed air energy storage system. The compressor cylinder body adopts an axial segmented structure and includes, from upstream to downstream, an axially segmented axial flow intake casing, an axial flow section casing, a centrifugal volute, and a centrifugal intake casing, wherein:

[0012] Each segmented casing adopts a horizontally split structure and is divided into an upper half cylinder and a lower half cylinder in the height direction. The upper half cylinders of each segmented casing are fixedly connected in sequence to form the upper half cylinder body of the compressor, and the lower half cylinders of each segmented casing are fixedly connected in sequence to form the lower half cylinder body of the compressor. The upper half cylinder body and the lower half cylinder body of the compressor are fixedly connected to form a complete compressor cylinder body;

[0013] The upper and lower cylinders of the axial flow intake casing and the axial flow section casing both adopt welded cylinder bodies, and multiple plate components are spliced together by welding to form an axial flow airflow channel with smooth streamlines inside the cylinder body; the upper and lower cylinders of the centrifugal volute both adopt cast cylinder bodies, and are integrally formed by casting to form a volute flow channel with a variable cross-section curve in the streamlines inside the cylinder body; the upper and lower cylinders of the centrifugal intake casing are selected to adopt welded cylinder bodies or cast cylinder bodies according to the structural characteristics of their internal airflow channels, and are respectively made by welding and splicing plates or casting to meet the comprehensive requirements of their aerodynamic performance and manufacturing process.

[0014] The second object of the present invention is to provide a manufacturing method for the compressor with the above-mentioned cast-weld combined segmented cylinder block, which at least includes the following steps:

[0015] SS1. Cylinder block segmented design and structure division:

[0016] According to the pneumatic flow path structure and operating conditions of the compressor, the compressor cylinder block is axially divided into four structural segments: an axial flow inlet housing, an axial flow section housing, a centrifugal volute, and a centrifugal inlet housing. Each structural segment is horizontally divided into an upper half cylinder and a lower half cylinder, forming a cylinder block segment structure with independent manufacturing and assembly characteristics;

[0017] SS2. Cylinder block structure process classification and processing method determination:

[0018] The upper and lower half cylinders of the axial flow inlet housing, the axial flow section housing, and the centrifugal inlet housing are set as welded cylinder blocks, which are welded into shape after being numerically controlled cut and pre-treated with bevels from multiple steel plates; the upper and lower half cylinders of the centrifugal volute are set as cast cylinder blocks, which are formed in one step by the integral sand casting process to ensure the geometric accuracy and pneumatic performance of its complex variable cross-section flow path;

[0019] SS3. Rough machining and pre-treatment of each section of the cylinder block:

[0020] Rough machining is respectively carried out on the upper and lower half cylinders of each segmented housing, including rough milling or rough turning of the horizontal middle parting surface and the axial end surface, and the machining accuracy reaches the rough machining requirements; finish machining and polishing are carried out on the internal flow path of the centrifugal volute to ensure that the surface roughness and geometric accuracy of the variable cross-section curve flow path meet the pneumatic performance requirements; surface treatment is carried out on the internal air flow channels of the axial flow inlet housing, the axial flow section housing, and the centrifugal inlet housing to make the surface roughness of the flow path meet the pneumatic performance requirements;

[0021] SS4. Assembly and finish machining of the segmented cylinder blocks:

[0022] The upper half cylinders are sequentially connected by end face flange bolts to form the upper half cylinder block of the compressor; the lower half cylinders are connected in the same way to form the lower half cylinder block of the compressor; finish milling is carried out on the horizontal middle parting surface of the upper half cylinder block and the lower half cylinder block of the compressor to ensure complete fitting of the two and achieve good sealing performance; finish turning is carried out on the internal positioning stop, partition slot, and static blade bearing cylinder installation positions of the upper and lower half cylinder blocks to ensure the coaxiality and dimensional accuracy of the installation positions of each component; the upper and lower half cylinder blocks are connected by multiple bolts arranged on the horizontal middle parting surface to form a complete cylinder block structure;

[0023] SS5. Inspection and quality control:

[0024] Inspect and clean the assembled compressor cylinder block to ensure no foreign matter remains, the surface of the air flow channel is smooth and meets the pneumatic performance requirements; conduct airtightness tests and structural strength inspections on the compressor cylinder block to ensure no leakage in the welded joints and the cast cylinder block and meet the design requirements.

[0025] (III) Technical Effects

[0026] Compared with the prior art, the compressor with a cast-weld combined segmented cylinder block and its manufacturing method of the present invention have the following beneficial and remarkable technical effects:

[0027] (1) According to the characteristics of the pneumatic structure design of the compressor, the present invention divides the compressor cylinder block into different processing technologies. The streamline of the axial flow section of the compressor is relatively straight, and a welded cylinder block is adopted; a cast volute is used for the centrifugal section, which not only ensures the pneumatic performance but also reduces the difficulty of processing and manufacturing.

[0028] (2) The present invention designs the cylinder block as a segmented structure, including an axial flow inlet casing, an axial flow outlet casing, a volute and a centrifugal inlet casing, and each section of the cylinder block is a horizontally split structure, which greatly reduces the difficulty of overall casting of the cylinder and shortens the casting time and cost.

[0029] (3) During the processing of the cylinder block, each section of the cylinder block can be individually processed by rough milling or rough turning. After the preliminary processing of each section of the cylinder block is completed, each section of the cylinder block is connected together by end face connecting bolts, and then the middle split surface of the cylinder block is finely milled and the partition groove is finely turned. Since each section of the cylinder block is relatively independent, different from the overall cast cylinder block structure that requires waiting for the completion of cylinder casting before starting processing, the cylinder block structure proposed by the present invention can be processed section by section, greatly optimizing the processing technology. Description of the Drawings

[0030] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings, wherein:

[0031] Figure 1 is a schematic structural diagram of the compressor with a cast-weld combined segmented cylinder block of the present invention;

[0032] Figure 2 is an implementation flowchart of the manufacturing method of the compressor cylinder block of the present invention.

[0033] Description of the Reference Numerals in the Drawings:

[0034] Axial intake housing 1, axial section housing 2, centrifugal volute 3, centrifugal intake housing 4, front bearing housing 5, rear bearing housing 6, stator blade carrier 7, axial stator blade 8, main shaft 9, axial rotor blade 10, guide basin 11, centrifugal impeller 12, radial bearing 13, thrust bearing 14. Specific implementation mode

[0035] The present invention aims to provide a compressor with a cast-weld combined segmented cylinder block and its manufacturing method. To make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, rather than all of the embodiments, and the described embodiments are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0036] Embodiment 1: Compressor with a cast-weld combined segmented cylinder block

[0037] As a specific embodiment, as Figure 1 shown, the compressor with a cast-weld combined segmented cylinder block provided by the present invention is used for multi-stage compression of gas in a large-scale compressed air energy storage system, and includes components such as an axial intake housing 1, an axial section housing 2, a centrifugal volute 3, a centrifugal intake housing 4, a front bearing housing 5, a rear bearing housing 6, a stator blade carrier 7, an axial stator blade 8, a main shaft 9, an axial rotor blade 10, a guide basin 11, a centrifugal impeller 12, a radial bearing 13, a thrust bearing 14, etc.

[0038] In the embodiment of the present invention, the compressor cylinder block adopts an axial segmentation structure, and sequentially includes an axially segmented axial intake housing 1, an axial section housing 2, a centrifugal volute 3 and a centrifugal intake housing 4 from upstream to downstream along the axis, wherein: each segmented housing adopts a horizontal split structure and is split into an upper half cylinder and a lower half cylinder in the height direction. The upper half cylinders of each segmented housing are fixedly connected in sequence to form the upper half cylinder body of the compressor, and the lower half cylinders of each segmented housing are fixedly connected in sequence to form the lower half cylinder body of the compressor. The upper half cylinder body and the lower half cylinder body of the compressor are fixedly connected to form a complete compressor cylinder block; the upper and lower half cylinders of the axial intake housing 1 and the axial section housing 2 both adopt welded cylinder blocks, and multiple plate components are spliced and formed by welding to form an axial flow channel with a smooth internal streamline in the cylinder block; the upper and lower half cylinders of the centrifugal volute 3 both adopt cast cylinder blocks and are integrally formed by casting to form a volute flow channel with a variable cross-section curve of the internal streamline in the cylinder block; the upper and lower half cylinders of the centrifugal intake housing 4 are selected to adopt welded cylinder blocks or cast cylinder blocks according to the structural characteristics of its internal air flow channel, and are respectively made by welding and splicing plates or casting and forming methods to meet the comprehensive requirements of its aerodynamic performance and manufacturing process.

[0039] Preferably, the upper and lower cylinders of each segmented casing are axially locked and connected through a flange bolt connection structure on the axial end face. The upper and lower cylinder bodies of the compressor are locked and connected in the height direction through a flange bolt connection structure arranged on the horizontal middle parting surface. And a sealing structure is provided between each connection surface to ensure the airtightness between each segmented casing and prevent compressed gas from leaking.

[0040] In the embodiment of the present invention, an axial-flow stator casing 2 is provided with an axial-flow stator vane carrier cylinder 7. The stator vane carrier cylinder 7 is installed on the inner wall of the axial-flow stator casing 2 through a positioning spigot structure. The positioning spigot includes an annular groove provided on the inner wall of the axial-flow stator casing 2 and an annular protrusion provided on the outer wall of the axial-flow stator vane carrier cylinder 7. The annular protrusion cooperates with the groove to realize the installation and positioning of the axial-flow stator vane carrier cylinder in the axial-flow stator casing. In addition, a plurality of uniformly distributed mounting holes are provided on the inner wall of the axial-flow stator vane carrier cylinder 7. The multi-stage axial-flow stator vanes are axially installed in each mounting groove through a pin shaft structure to guide the air flow and improve the compression efficiency.

[0041] In the embodiment of the present invention, the compressor further includes a guide basin 11 and a diaphragm stator component arranged between the axial-flow section and the centrifugal section, which are used to guide the axial air flow into a radial air flow and are respectively installed in the compressor cylinder body through a positioning spigot. The positioning spigot is an annular groove or protrusion provided on the inner wall of the compressor cylinder body and an annular protrusion or groove provided on the outer walls of the guide basin 11 and the diaphragm. The cooperation of the annular protrusion and the groove realizes the installation and positioning of the guide basin and the diaphragm in the compressor cylinder body.

[0042] In the embodiment of the present invention, the compressor rotor is composed of two or more sections of rotating shafts 9. Each section of the rotating shaft is fixedly connected through a hydraulic bolt. The head of the hydraulic bolt is arranged in a groove at one end of the rotating shaft. The bolt passes through the entire rotating shaft and is connected to a threaded hole on the other end of the rotating shaft to realize the connection and torque transmission between the multi-section rotating shafts. In addition, multiple rows of circumferentially distributed tenon grooves are axially arranged on the outer wall of the axial-flow section rotating shaft. The axial-flow blades are installed on the rotating shaft tenon grooves through a tenon head structure to realize the reliable connection between the axial-flow blades and the rotating shaft; the centrifugal impeller is installed on the centrifugal section rotating shaft by a hot sleeve method. And during the hot sleeve process, first, the centrifugal impeller is heated and expanded, and then sleeved on the rotating shaft. After cooling, the centrifugal impeller is fastened on the rotating shaft by using the shrinkage force of the centrifugal impeller to realize the tight fit between the centrifugal impeller and the rotating shaft. In the present invention, the compressor rotating shaft is designed as a hollow rotor, which greatly reduces the weight of the rotating shaft, reduces the bearing load, is beneficial to the design of rotor dynamics and bearings. A hollow cavity is formed inside the rotating shaft, and the wall thickness of the rotating shaft is determined according to the structural strength requirements.

[0043] In the embodiment of the present invention, the compressor further includes a front bearing housing 5 and a rear bearing housing 6. The front bearing housing 5 is located on one side of the axial flow inlet housing 1, and the rear bearing housing 6 is located on one side of the centrifugal inlet housing 4. Radial bearings 13 are respectively installed in the front bearing housing 5 and the rear bearing housing 6 for supporting the rotating shaft 9 and restricting its radial displacement. A thrust bearing 14 is also installed in the rear bearing housing 6 for bearing the axial thrust generated by the compressor rotor during operation.

[0044] Preferably, each cylinder block of the compressor cylinder block is separately rough machined (preferably including rough milling or rough turning). After the rough machining of each cylinder block is completed, the cylinder blocks are axially connected, and then the precision milling of the cylinder block split surface and the precision turning of the baffle groove are carried out, so that each cylinder block is processed section by section without waiting for the completion of the manufacture of the whole cylinder block to start processing.

[0045] Through the compressor design with a cast-welded combined segmented cylinder block described in Embodiment 1, the aerodynamic performance of the compressor can be effectively optimized, the manufacturing cost can be reduced, and the production cycle can be shortened. This design combines a reasonable segmented structure with precise welding and casting processes, which not only ensures the structural stability of the compressor but also improves its application efficiency in large-scale compressed air energy storage systems.

[0046] Embodiment 2: Processing and manufacturing method

[0047] Based on the structure of the cast-welded combined segmented cylinder block compressor described in Embodiment 1, the processing and manufacturing method thereof is further described in detail in this embodiment. As Figure 2 shown, this method realizes the synergistic advantages of the aerodynamic accuracy of the cast volute and the processing efficiency of the welded cylinder block by optimizing the segmented processing and overall assembly process. The following specifically describes each key technical link in combination with the process flow:

[0048] SS1. Cylinder block segmented design and structure division:

[0049] According to the aerodynamic flow path structure and operating conditions of the compressor, the compressor cylinder block is axially divided into four structural segments: the axial flow inlet housing, the axial flow section housing, the centrifugal volute, and the centrifugal inlet housing. This segmentation method not only helps to optimize the aerodynamic performance of each cylinder block but also facilitates subsequent independent manufacturing and assembly. Each structural segment is horizontally split into an upper half cylinder and a lower half cylinder to form a cylinder block segment structure with independent manufacturing and assembly characteristics. The selection of the horizontal split surface needs to fully consider the complexity of the internal structure and the convenience of assembly to minimize the assembly error and improve the assembly efficiency.

[0050] SS2. Cylinder block structure process classification and determination of processing methods:

[0051] For the aerodynamic performance and manufacturing difficulties of different structural segments, different manufacturing processes are adopted. The upper and lower cylinders of the axial-flow inlet casing, axial-flow section casing, and centrifugal inlet casing are set as welded cylinders, which are formed by welding multiple steel plates after numerical control cutting and bevel pretreatment. The welded cylinder can flexibly achieve complex flow channel structures, and has high manufacturing efficiency and low manufacturing cost. The selection of welding process needs to be comprehensively considered according to the material characteristics and the strength requirements of the welded joints. Common welding methods include gas shielded welding, laser welding, etc. The upper and lower cylinders of the centrifugal volute are set as cast cylinders, and are formed at one time by the integral sand casting process to ensure the geometric accuracy and aerodynamic performance of its complex variable cross-section flow channel. The casting process can achieve complex internal structures and has high dimensional accuracy and surface quality. The selection of casting materials needs to be comprehensively considered according to the corrosiveness of the working medium and the working temperature. Common casting materials include ductile iron, alloy cast steel, etc.

[0052] SS3. Rough machining and pretreatment of each cylinder section:

[0053] In order to ensure the subsequent finishing and assembly accuracy, it is necessary to perform preliminary rough machining on the upper and lower cylinders of each segmented casing respectively, including rough milling or rough turning of the horizontal middle plane and axial end faces, and the machining accuracy reaches the rough machining requirements. The main purpose of rough machining is to remove the surplus generated during casting or welding and provide a reference for subsequent finishing. The internal flow channel of the centrifugal volute is subjected to finishing and polishing to ensure that the surface roughness and geometric accuracy of the variable cross-section curve flow channel meet the aerodynamic performance requirements. The internal flow channel of the centrifugal volute is a key component of the compressor, and its aerodynamic performance directly affects the overall efficiency of the compressor. Therefore, high-precision machining methods and strict quality control are required. The internal air flow channels of the axial-flow inlet casing, axial-flow section casing, and centrifugal inlet casing are surface-treated, such as sandblasting, polishing, etc., so that the surface roughness of the flow channel meets the aerodynamic performance requirements. Surface treatment can effectively reduce the frictional resistance of the flow channel surface, improve the flow capacity of the air flow, and thus improve the efficiency of the compressor.

[0054] SS4. Assembly and finishing of the segmented cylinders:

[0055] To ensure the overall precision and sealing performance of the compressor cylinder block, precise assembly and finish machining of each segmented cylinder block are required. First, the upper half cylinders are sequentially connected by end face flange bolts to form the upper half cylinder block of the compressor; the lower half cylinders are connected in the same way to form the lower half cylinder block of the compressor. During the connection process, the tightening torque of the bolts needs to be strictly controlled to ensure the reliability and uniformity of the connection. After that, the horizontal middle parting surface of the upper and lower half cylinder blocks of the compressor is finely milled to ensure complete fitting between the two, achieving good sealing performance. The horizontal middle parting surface is an important sealing part of the compressor cylinder block, and its sealing performance directly affects the leakage rate and efficiency of the compressor. Therefore, high-precision machining methods and strict quality control are required. Then, the positioning stop, partition groove, and installation position of the stationary vane bearing cylinder inside the upper and lower half cylinder blocks are finely turned to ensure the coaxiality and dimensional accuracy of the installation positions of each component. The installation accuracy of these components directly affects the aerodynamic performance and operating stability of the compressor. Therefore, high-precision machining methods and strict quality control are required. Finally, the upper and lower half cylinder blocks are connected by multiple bolts arranged on the horizontal middle parting surface to form a complete cylinder block structure.

[0056] SS5. Inspection and Quality Control:

[0057] After completing the assembly of the cylinder block, strict inspection and cleaning of the compressor cylinder block are carried out. The inspection contents include ensuring that there is no foreign matter remaining, the surface of the air flow channel is smooth and meets the aerodynamic performance requirements. An airtightness test is carried out on the cylinder block to ensure that all welded joints and the cast cylinder block have no leakage and meet the design requirements. Through the airtightness test, leakage problems caused by improper assembly or material defects can be effectively eliminated. At the same time, structural strength detection is carried out to ensure the stability and reliability of the compressor cylinder block during long-term operation. The detection means include static pressure test, dynamic vibration test, etc., to comprehensively evaluate the cylinder block performance.

[0058] Example 2 The above processing and manufacturing method covers key links such as cylinder block segmentation, process selection, rough and finish machining, assembly connection, and quality control. Through this method, it is possible to ensure the high precision and high efficiency of the cast-welded segmented compressor cylinder block during the production process. The precise control of each processing step and strict quality inspection ensure the aerodynamic performance, sealing performance, and structural strength of the compressor cylinder block, further improving the overall performance and reliability of the compressor.

[0059] Through the above embodiments, the object of the present invention is completely and effectively achieved. Those skilled in the art can understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Although the present invention has been described with respect to the currently considered most practical and preferred embodiments, it should be understood that the present invention is not limited to the disclosed embodiments, and any modification that does not deviate from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A compressor with a cast-weld combined segmented cylinder block, characterized in that, The compressor cylinder block adopts an axial segmented structure, which sequentially includes an axial flow inlet casing, an axial flow section casing, a centrifugal volute, and a centrifugal inlet casing that are segmented along the axial direction from upstream to downstream, where: Each segmented casing adopts a horizontal split structure and is split into an upper half cylinder and a lower half cylinder in the height direction. The upper half cylinders of each segmented casing are fixedly connected in sequence to form the upper half cylinder body of the compressor, and the lower half cylinders of each segmented casing are fixedly connected in sequence to form the lower half cylinder body of the compressor. The upper half cylinder body and the lower half cylinder body of the compressor are fixedly connected to form a complete compressor cylinder block; The upper and lower half cylinders of the axial flow inlet casing and the axial flow section casing both adopt welded cylinders, and multiple plate components are spliced and formed by welding to form an axial flow air passage with a smooth internal streamline in the cylinder. The upper and lower half cylinders of the centrifugal volute both adopt cast cylinders, and are integrally formed by casting to form a volute passage with a variable cross-section curve internal streamline in the cylinder. The upper and lower half cylinders of the centrifugal inlet casing are selected to adopt welded cylinders or cast cylinders according to the structural characteristics of its internal air passage, and are respectively made by welding and splicing plates or casting and forming methods.

2. The compressor with a cast-weld combined segmented cylinder block according to claim 1, wherein, Axial locking connections are realized between the upper and lower half cylinders through flange bolt connection structures on the axial end faces, and locking connections in the height direction are realized between the upper half cylinder body and the lower half cylinder body of the compressor through flange bolt connection structures arranged on the horizontal middle parting plane, and sealing structures are provided between all connection surfaces.

3. The compressor with a cast-weld combined segmented cylinder block according to claim 1, characterized in that An axial flow stationary vane support cylinder is arranged in the axial flow section casing, and the stationary vane support cylinder is installed on the inner wall of the axial flow section casing through a positioning spigot structure. The positioning spigot structure includes an annular groove arranged on the inner wall of the axial flow section casing and an annular protrusion arranged on the outer wall of the axial flow stationary vane support cylinder. The annular protrusion cooperates with the annular groove to realize the installation and positioning of the axial flow stationary vane support cylinder in the axial flow section casing.

4. The compressor with a cast-weld combined segmented cylinder block according to claim 1, characterized in that The compressor further includes a guide basin and a diaphragm stator component arranged between the axial flow section and the centrifugal section, and are respectively installed in the compressor cylinder block through positioning spigots. The positioning spigots are annular grooves or protrusions arranged on the inner wall of the compressor cylinder block and annular protrusions or grooves arranged on the outer walls of the guide basin and the diaphragm. The installation and positioning of the guide basin and the diaphragm in the compressor cylinder block are realized through the cooperation of the protrusion and the groove.

5. The compressor with a cast-weld combined segmented cylinder block according to claim 1, characterized in that, The compressor rotor is composed of two or more sections of rotating shafts. The rotating shafts of each section are fixedly connected through hydraulic bolts. The head of the hydraulic bolt is arranged in a groove at one end of the rotating shaft, and the bolt passes through the entire rotating shaft and is connected to a threaded hole on the rotating shaft at the other end to realize the connection and torque transmission between multiple sections of rotating shafts.

6. The compressor with a cast-weld combined segmented cylinder block according to claim 5, characterized in that, Multiple rows of circumferentially distributed tenon grooves are arranged on the outer wall of the axial flow section rotating shaft along the axial direction, and the axial flow blades are installed on the rotating shaft tenon grooves through tenon structures; the centrifugal impeller is installed on the centrifugal section rotating shaft by a hot sleeve method. During the hot sleeve process, the centrifugal impeller is first heated and expanded, and then sleeved on the rotating shaft. After cooling, the centrifugal impeller is fastened on the rotating shaft by its shrinkage force.

7. The compressor with a cast-weld combined segmented cylinder block according to claim 5, wherein, The compressor rotating shaft is designed as a hollow rotor, and a hollow cavity is formed inside the rotating shaft. The wall thickness of the rotating shaft is determined according to the structural strength requirements.

8. The compressor with a cast-weld combined segmented cylinder block according to claim 5, characterized in that, The compressor further includes a front bearing housing and a rear bearing housing. The front bearing housing is located on one side of the axial-flow inlet housing, and the rear bearing housing is located on one side of the centrifugal inlet housing. Radial bearings are respectively installed in the front bearing housing and the rear bearing housing to support the rotating shaft and limit its radial displacement. A thrust bearing is also installed in the rear bearing housing to bear the axial thrust generated by the compressor rotor during operation.

9. The compressor with a cast-weld combined segmented cylinder block according to claim 1, characterized in that, Each cylinder block is separately rough-machined. After the rough machining of each cylinder block is completed, the cylinder blocks are axially connected, and then the precision milling of the cylinder block split surface and the precision turning of the diaphragm groove are carried out, so that each cylinder block is machined step by step without waiting for the completion of the manufacture of the integral cylinder block to start machining.

10. A manufacturing method for a compressor having a cast-welded combined segmented cylinder block according to any one of claims 1 to 9 above, characterized in that, It at least includes the following steps: SS1. Cylinder block segmented design and structure division: According to the pneumatic flow path structure and operating conditions of the compressor, the compressor cylinder block is axially divided into four structural segments: an axial-flow inlet housing, an axial-flow section housing, a centrifugal volute, and a centrifugal inlet housing. Each structural segment is divided into an upper half cylinder and a lower half cylinder by a horizontal split method. SS2. Cylinder block structure process classification and machining method determination: The upper and lower half cylinders of the axial-flow inlet housing, the axial-flow section housing, and the centrifugal inlet housing are set as welded cylinder blocks, which are formed by welding multiple steel plates after CNC cutting and bevel pretreatment. The upper and lower half cylinders of the centrifugal volute are set as cast cylinder blocks, which are formed at one time by the integral sand casting process. SS3. Rough machining and pretreatment of each cylinder block: The upper and lower half cylinders of each segmented housing are respectively subjected to preliminary rough machining, including rough milling or rough turning of the horizontal split surface and the axial end face. The internal flow path of the centrifugal volute is subjected to finish machining and polishing treatment. The internal air flow channels of the axial-flow inlet housing, the axial-flow section housing, and the centrifugal inlet housing are subjected to surface treatment. SS4. Assembly and finish machining of the segmented cylinder blocks: The upper and lower half cylinders are sequentially connected by end face flange bolts to respectively form the upper and lower half cylinder bodies of the compressor. The horizontal split surface of the upper half cylinder body and the lower half cylinder body of the compressor is subjected to precision milling. The positioning stop, diaphragm groove, and installation position of the stationary blade bearing cylinder inside the upper and lower half cylinder bodies are subjected to precision turning. The upper and lower half cylinder bodies are connected by multiple bolts arranged on the horizontal split surface to form a complete cylinder block structure. SS5. Inspection and quality control: The assembled compressor cylinder block is inspected and cleaned to ensure that there is no foreign matter residue, the surface of the air flow channel is smooth and meets the pneumatic performance requirements. The airtightness test and structural strength test are carried out on the compressor cylinder block to ensure that there is no leakage in the welded joints and the cast cylinder blocks and meet the design requirements.

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