Arcuate adapter structure and compressor

Abstract

The application discloses a bow-shaped switching structure and a compressor, which are used for connecting with an inner casing and an outer casing respectively, and comprises a first axial part formed by extending in a first direction along an axial direction, a first radial part formed by extending outward along a radial direction from a first end of the first axial part, a second axial part formed by extending in a second direction along the axial direction from an outer end of the first radial part, a second radial part formed by extending outward along the radial direction from a second end of the second axial part, a third axial part formed by extending in the first direction along the axial direction from an outer part of the second radial part, and a third radial part formed by extending outward along the radial direction from the third axial part, the first radial part is used for connecting with the inner casing through a fastener along the axial direction and radially abutting against an outer side wall of the inner casing, the third axial part is used for radially abutting against an inner wall surface of the outer casing, the third radial part is used for connecting with the outer casing through the fastener along the axial direction, the first direction and the second direction are opposite, and an axial length of the first axial part is greater than axial lengths of the second axial part and the third axial part.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular, to an arc-shaped transition structure. Furthermore, this invention also relates to a compressor comprising the aforementioned arc-shaped transition structure. Background Technology

[0002] The compressor is one of the important components of an aero engine. Compressors usually adopt a double-casing structure, which includes an inner casing and an outer casing. The outer casing bears the load, and the inner casing controls the clearance between the rotor blades and the casing. This cleverly solves the thermal mismatch problem that cannot be overcome by a single-casing structure. In order to achieve load transfer between the inner and outer casings, a transition structure needs to be set between the inner and outer casings.

[0003] For example, Chinese invention patent CN110374698B discloses a load-bearing ring assembly and a double-layer casing structure having the same, comprising: a load-bearing ring having a zigzag-shaped load-bearing ring body, with a first transverse portion and a second transverse portion extending parallel to each other from both ends of the load-bearing ring body, a first radial portion extending radially from the first transverse portion, a first through hole provided on the first radial portion, a second radial portion extending radially from the end of the second transverse portion, a second through hole provided on the second radial portion, and a plug-in portion extending laterally from the end of the second radial portion near the engine axis; a rotor outer ring having an outer ring body and a hook portion extending radially from the outer ring body and laterally bent, the hook portion and the outer ring body forming a receiving space for engaging with the plug-in portion; and a pin passing through the load-bearing ring and the rotor outer ring for fixing the two. This application shortens the length of the inner casing by assembling the last stage rotor outer ring onto the load-bearing ring, ensuring that the rear end face of the inner casing is in front of the load-bearing ring, thereby solving the problem of inner casing assembly interference. However, in the aforementioned load-bearing ring assembly, the axial and radial distances between the inner and outer mounting edges are very close. When fasteners are installed on the inner mounting edge, they are prone to interference with the outer mounting edge, making assembly difficult. In addition, the bends in the fold lines are long, occupying a large space. Furthermore, the rigidity of this structure is high, which is not conducive to reducing vibration transmission between the inner and outer casings through flexible deformation. In actual operation, excessive vibration can easily affect the stability of each casing.

[0004] For example, Chinese invention patent application CN114778118A discloses a double-layer casing connection and load-bearing structure for connecting and fixing between the inner and outer casings. Its key feature is that it includes multiple adjustable tie rod assemblies, with two adjustable tie rod assemblies forming a group. Each group of adjustable tie rod assemblies is arranged in a figure-eight shape and evenly distributed circumferentially between the inner and outer casings. The length of the adjustable tie rod assemblies is adjustable, and they have multiple degrees of rotational freedom, thus solving the problem of inconsistent deformation between the inner and outer casings. Addressing the issues of inconsistent deformation and inconvenient disassembly in existing afterburner test equipment using support plate-type connection and fixing structures, the double-layer casing connection and load-bearing structure with a ball-head structure and tangentially adjustable tie rods provided by this invention has advantages such as simple structure, convenient installation and debugging, and the ability to coordinate the circumferential and axial thermal deformation of the double-layer casing. However, in the aforementioned double-layer casing connection load-bearing structure, the adjustable tie rod assembly includes many parts, making actual assembly operations cumbersome and difficult to ensure concentricity between the inner and outer casings. Furthermore, it requires additional double-ear structures on both the inner and outer casings, which is detrimental to their manufacturing and processing. Alternatively, it may only be suitable for double-layer casings with double-ear structures. Moreover, the tie rod in this structure has high rigidity, making it difficult to reduce vibration transmission between the inner and outer casings through deformation. In actual operation, excessive vibration can easily affect the stability of each casing. Summary of the Invention

[0005] This invention provides an arc-shaped transition structure and a compressor to solve the technical problems of existing compressor double-casing structures, such as difficult assembly, large space occupation, and poor vibration transmission between the inner and outer casings; or cumbersome assembly, which is not conducive to the processing and manufacturing of the outer and inner casings, and is also not conducive to the reduction of vibration transmission between the inner and outer casings.

[0006] According to one aspect of the present invention, an arc-shaped adapter structure is provided for connection to an inner casing and an outer casing respectively, comprising a first axial portion extending axially in a first direction, a first radial portion extending radially outward from a first end of the first axial portion, a second axial portion extending axially in a second direction from an outer end of the first radial portion, a second radial portion extending radially outward from a second end of the second axial portion, a third axial portion extending axially in the first direction from the outer side of the second radial portion, and a third radial portion extending radially outward from the third axial portion. The first radial portion is used to be connected axially to the inner casing by fasteners and to radially abut against the outer side wall of the inner casing. The third axial portion is used to radially abut against the inner wall surface of the outer casing. The third radial portion is used to be connected axially to the outer casing by fasteners. The first direction and the second direction are opposite. The axial length of the first axial portion is greater than the axial lengths of the second axial portion and the third axial portion.

[0007] As a further improvement to the above technical solution:

[0008] Furthermore, the second radial portion is divided into connecting portion one and connecting portion two along the radial center. The first axial portion, the first radial portion, the second axial portion and connecting portion one are integrally formed. The connecting portion two, the third axial portion and the third radial portion are integrally formed. The outer end of connecting portion one and the inner end of connecting portion two are connected.

[0009] Furthermore, the first end of the third axial portion is provided with an abutment portion extending radially outward, the abutment portion being used to radially abut against the inner sidewall of the outer casing.

[0010] Furthermore, the third radial portion has a centrally located connecting hole for connecting fasteners. The abutting portion includes a stop on the first side of the third radial portion and a stop on the second side of the third radial portion. The stop is used to cooperate with the outer casing on the first side of the third radial portion, and the stop is used to cooperate with the outer casing on the second side of the third radial portion.

[0011] Furthermore, the radial thickness of the contact portion is 4mm to 7mm.

[0012] Furthermore, the first radial portion has a centrally located connecting hole 2 for connecting fasteners, and the inner end of the first radial portion has a stop 3 for engaging with the outer wall surface of the inner casing.

[0013] Furthermore, the axial thickness of the first radial portion is 4mm to 6mm.

[0014] Furthermore, the second end of the first axial portion is provided with an overlapping portion extending radially inward, and the first end of the overlapping portion is provided with an overlapping groove formed axially inward for overlapping with the stator component of the compressor.

[0015] Furthermore, the second end of the overlapping part is provided with an inclined end face for forming an inclined annular air intake channel with the outer ring of the compressor rotor, and the inclination angle of the inclined end face is 30°~60°.

[0016] According to another aspect of the invention, a compressor is also provided, which includes the above-described bow-shaped transition structure.

[0017] The present invention has the following beneficial effects:

[0018] The bow-shaped transition structure of the present invention first extends axially in a first direction to form a first axial portion. The first end of the first axial portion extends radially outward to form a first radial portion. The outer end of the first radial portion extends axially in a second direction to form a second axial portion. The second end of the second axial portion extends radially outward to form a second radial portion. The outer side of the second radial portion extends axially in the first direction to form a third axial portion. The third axial portion extends radially outward to form a third radial portion. The first axial portion, first radial portion, second axial portion, second radial portion, third axial portion, and third radial portion are sequentially connected, with the first and second directions opposite, resulting in a bow-shaped arrangement of the bow-shaped transition structure. The first radial portion is axially connected to the inner casing via fasteners and radially abuts against the outer wall of the inner casing. The third radial portion is axially connected to the outer casing via fasteners. After the third axial portion radially abuts against the inner wall of the outer casing, the bow-shaped transition structure, with its two ends in the radial direction abutting against the inner and outer casings respectively, can satisfy the deformation coordination of the inner and outer casings under hot conditions. In actual operation, it absorbs vibration energy, greatly reducing vibration transmission between the inner and outer casings and ensuring the working stability of the inner and outer casings. By making the axial length of the first axial portion greater than the axial lengths of the second and third axial portions, and with the first and second directions opposite, that is, the second transverse and third axial portions coincide with the first axial portion in the radial direction, the maximum axial length of the bow-shaped transition structure depends on the axial length of the first axial portion, thereby greatly reducing the axial space occupied. In addition, the radial distance between the first and third radial portions is relatively large, so there will be no interference with each other during actual assembly. The assembly process is simple, and there are no special requirements for the structure of the inner and outer casings during actual assembly, which is beneficial to the processing and manufacturing of the inner and outer casings. Compared with the prior art, the bow-shaped transition structure is simple to assemble, occupies little space, is beneficial to the processing and manufacturing of the outer and inner casings, can achieve deformation coordination between the inner and outer casings and reduce vibration transmission between them, and is highly practical and suitable for widespread promotion and application.

[0019] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the bow-shaped transition structure according to a preferred embodiment of the present invention;

[0022] Figure 2This is a partial structural schematic diagram of the compressor according to a preferred embodiment of the present invention.

[0023] Legend:

[0024] 10. First axial portion; 11. Overlap portion; 12. Overlap groove; 13. Inclined end face; 20. First radial portion; 21. Connecting hole two; 22. Stop three; 30. Second axial portion; 40. Second radial portion; 41. Connecting part one; 42. Connecting part two; 50. Third axial portion; 51. Abutting portion; 52. Stop one; 53. Stop two; 60. Third radial portion; 61. Connecting hole one; 71. Inner casing; 72. Stator component; 73. Rotor outer ring; 74. Front casing; 75. Rear casing; 76. Front cavity; 77. Rear cavity. Detailed Implementation

[0025] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0026] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not restrictive. For example, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” as used herein may also include the plural forms. When used in this specification, the terms “comprising,” “including,” and / or “containing” mean that the associated integers, steps, operations, elements, and / or components are present, but do not preclude the presence of one or more other features, integers, steps, operations, elements, components, and / or groups, or that other features, integers, steps, operations, elements, components, and / or groups may be added to the system / method.

[0027] Considering the following description, these and other features of this specification, as well as the operation and function of the related components of the structure, and the economy of assembly and manufacture of the parts, can be significantly improved. All of these form part of this specification with reference to the accompanying drawings. However, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not drawn to scale.

[0028] like Figure 1 and Figure 2As shown, the bow-shaped adapter structure of this embodiment is used to connect to the inner casing 71 and the outer casing respectively. It includes a first axial portion 10 extending axially in a first direction, a first radial portion 20 extending radially outward from the first end of the first axial portion 10, a second axial portion 30 extending axially in a second direction from the outer end of the first radial portion 20, a second radial portion 40 extending radially outward from the second end of the second axial portion 30, a third axial portion 50 extending axially in the first direction from the outer side of the second radial portion 40, and a third radial portion 60 extending radially outward from the third axial portion 50. The first radial portion 20 is used to connect axially to the inner casing 71 by fasteners and radially abut against the outer side wall of the inner casing 71. The third axial portion 50 is used to radially abut against the inner wall surface of the outer casing. The third radial portion 60 is used to connect to the outer casing by fasteners. The first direction and the second direction are opposite. The axial length of the first axial portion 10 is greater than the axial lengths of the second axial portion 30 and the third axial portion 50.

[0029] like Figure 1 and Figure 2As shown, specifically, the bow-shaped transition structure of the present invention first extends axially in a first direction to form a first axial portion 10. The first end of the first axial portion 10 extends radially outward to form a first radial portion 20. The outer end of the first radial portion 20 extends axially in a second direction to form a second axial portion 30. The second end of the second axial portion 30 extends radially outward to form a second radial portion 40. The outer side of the second radial portion 40 extends axially in the first direction to form a third axial portion 50. The third axial portion 50 extends radially outward to form a third radial portion 60. The first axial portion 10, the first radial portion 20, and the second axial portion... 30, the second radial portion 40, the third axial portion 50, and the third radial portion 60 are connected sequentially, with the first direction and the second direction being opposite, so that the bow-shaped transition structure is arranged in a "bow" shape. The first radial portion 20 is connected axially to the inner casing 71 by fasteners and radially abuts against the outer wall of the inner casing 71. The third radial portion 60 is connected axially to the outer casing by fasteners. After the third axial portion 50 radially abuts against the inner wall of the outer casing, the bow-shaped transition structure, with its two ends in the radial direction abutting against the inner casing 71 and the outer casing respectively, can meet the requirements of the inner casing under hot conditions. The deformation of the inner casing 71 and the outer casing is coordinated, and vibration energy is absorbed during actual operation, greatly reducing the vibration transmission between the inner casing 71 and the outer casing, ensuring the working stability of the inner casing 71 and the outer casing; by making the axial length of the first axial portion 10 greater than the axial length of the second axial portion 30 and the third axial portion 50, and the first direction and the second direction are opposite, that is, the second lateral and third axial portions 50 coincide with the first axial portion 10 in the radial direction, that is, the maximum axial length of the bow-shaped transition structure depends on the axial length of the first axial portion 10, thereby greatly reducing the axial space occupied; in addition, the first radial portion The radial distance between 20 and the third radial part 60 is relatively large, so they will not interfere with each other during actual assembly. The assembly process is simple, and there are no special requirements for the structure of the inner casing 71 and the outer casing during actual assembly, which is beneficial to the processing and manufacturing of the inner casing 71 and the outer casing. Compared with the prior art, the bow-shaped transition structure of this solution is simple to assemble, occupies little space, and is beneficial to the processing and manufacturing of the outer casing and the inner casing 71. It can realize the deformation coordination between the inner casing 71 and the outer casing and reduce the vibration transmission between the inner casing 71 and the outer casing. It is highly practical and suitable for widespread promotion and application.

[0030] It should be understood that the first axial portion 10, the first radial portion 20, the second axial portion 30, the second radial portion 40, the third axial portion 50, and the third radial portion 60 are all annular structures.

[0031] It should be understood that both axial and radial directions are based on the axial and radial directions of the inner casing 71 or the outer casing.

[0032] It should be understood that the first end refers to the end in the first direction, the second end refers to the end in the second direction, the first side refers to the side in the first direction, and the second side refers to the side in the second direction.

[0033] It should be understood that the outer end refers to the end facing away from the inner casing 71, and the inner end refers to the end facing the inner casing 71.

[0034] Alternatively, the fastener may be a combination of bolts and nuts, or a combination of bolts, nuts, and washers.

[0035] like Figure 1 As shown, in this embodiment, the second radial portion 40 is divided into a connecting portion 1 41 and a connecting portion 2 42 along the radial center. The first axial portion 10, the first radial portion 20, the second axial portion 30 and the connecting portion 1 41 are integrally formed. The connecting portion 2 42, the third axial portion 50 and the third radial portion 60 are integrally formed. The outer end of the connecting portion 1 41 and the inner end of the connecting portion 2 42 are connected. Specifically, for ease of processing, the second radial portion 40 is radially centered into a connecting portion 41 and a connecting portion 42, thus dividing the bow-shaped transition structure into two parts. One part consists of a first axial portion 10, a first radial portion 20, a second axial portion 30, and a connecting portion 41, while the other part consists of a connecting portion 42, a third axial portion 50, and a third radial portion 60. After being processed and formed separately, the bow-shaped transition structure can be made into a whole by connecting the outer end of the connecting portion 41 and the inner end of the connecting portion 42. Compared with the prior art, the bow-shaped transition structure has only two parts, making the assembly operation simple and helping to ensure the concentricity between the inner casing 71 and the outer casing.

[0036] Optionally, the first connecting part 41 and the second connecting part 42 are fixed by welding.

[0037] like Figure 1 As shown, in this embodiment, the first end of the third axial portion 50 is provided with an abutment portion 51 extending radially outward, the abutment portion 51 being used to radially abut against the inner sidewall of the outer casing.

[0038] It should be understood that the outer casing includes a front casing 74 and a rear casing 75, which are connected by a third radial portion 60. The front casing 74 is the outer casing in the first direction, and the rear casing 75 is the outer casing in the second direction.

[0039] like Figure 1As shown, specifically, the abutment portion 51 radially abuts against the inner sidewalls of the front casing 74 and the rear casing 75 respectively, which reduces the area of ​​axial abutment compared to directly abutting against the outer casing through the third axial portion 50. Furthermore, the first end of the third axial portion 50 is suspended, which is conducive to deformation under stress, thereby satisfying the deformation coordination between the inner casing 71 and the outer casing and greatly reducing the vibration transmission between the inner casing 71 and the outer casing.

[0040] like Figure 1 As shown, in this embodiment, the third radial portion 60 is provided with a connecting hole 61 for connecting fasteners in the center. The abutting portion 51 includes a stop 52 located on the first side of the third radial portion 60 and a stop 53 located on the second side of the third radial portion 60. The stop 52 is used to cooperate with the outer casing located on the first side of the third radial portion 60, and the stop 53 is used to cooperate with the outer casing located on the second side of the third radial portion 60.

[0041] It should be understood that the outer casing on the first side is the front casing 74, and the outer casing on the second side is the rear casing 75.

[0042] It should be understood that the front casing 74 is provided with a stop corresponding to the stop 52, and the front casing 74 is provided with a through hole corresponding to the connection hole 61.

[0043] It should be understood that the rear casing 75 is provided with a stop corresponding to the stop 52, and the rear casing 75 is provided with a through hole corresponding to the connection hole 61.

[0044] like Figure 1 As shown, specifically, the bow-shaped adapter casing mates with the front casing 74 and the rear casing 75 respectively through stop 1 52 and stop 2 53, and is connected to the front casing 74 and the rear casing 75 respectively through fasteners and connecting hole 1 61, so as to realize the centering force transmission between the bow-shaped adapter structure and the outer casing.

[0045] In this embodiment, the radial thickness of the abutment portion 51 is 4mm to 7mm. Specifically, by controlling the radial thickness of the abutment portion 51, the stability of the connection between the bow-shaped adapter structure and the outer casing is ensured. When the radial thickness of the abutment portion 51 is between 4mm and 7mm, the stability of the connection between the adapter structure and the outer casing can be guaranteed, the weight of the adapter structure can be controlled, and the reasonable layout of the bow-shaped adapter structure in the radial direction is also beneficial. When the radial thickness of the abutment portion 51 is greater than 7mm, the stability of the connection with the outer casing remains basically unchanged, but the weight of the parts will increase, and it is also not conducive to the spatial layout of the entire bow-shaped adapter structure. When the radial thickness of the abutment portion 51 is less than 4mm, the stability of the connection with the outer casing cannot be guaranteed.

[0046] like Figure 1As shown, in this embodiment, the first radial portion 20 has a connecting hole 21 for connecting fasteners in the center, and the inner end of the first radial portion 20 has a stop 22 for cooperating with the outer wall surface of the inner casing 71.

[0047] It should be understood that the inner casing 71 is provided with a stop corresponding to the stop 3 22, and the inner casing 71 is provided with a through hole corresponding to the connection hole 21.

[0048] like Figure 1 As shown, specifically, the bow-shaped adapter casing mates with the outer wall of the inner casing 71 through stop three 22, and is connected to the inner casing 71 through fasteners and connecting holes two 21, so as to realize the centering force transmission between the bow-shaped adapter structure and the inner casing 71.

[0049] In this embodiment, the axial thickness of the first radial portion 20 is 4mm to 6mm. Specifically, by controlling the axial thickness of the first radial portion 20, the stability of the connection between the bow-shaped transition structure and the inner casing 71 is ensured. When the axial thickness of the first radial portion 20 is between 4mm and 6mm, the stability of the connection between the transition structure and the inner casing 71 can be guaranteed, the weight of the transition structure can be controlled, and the vibration transmission of the bow-shaped transition structure can be reduced. When the axial thickness of the first radial portion 20 is greater than 6mm, the rigidity of the part is enhanced, and the stability of the connection with the inner casing 71 remains basically unchanged, but the weight of the part will increase, which is also not conducive to reducing the vibration transmission of the entire bow-shaped transition structure. When the axial thickness of the first radial portion 20 is less than 4mm, the stability of the connection with the inner casing 71 cannot be guaranteed.

[0050] like Figure 1 As shown, in this embodiment, the second end of the first axial portion 10 is provided with an overlapping portion 11 extending radially inward, and the first end of the overlapping portion 11 is provided with an overlapping groove 12 formed axially inward for overlapping with the stator component 72 of the compressor. Specifically, the stator component 72 of the compressor is installed by overlapping with the stator component 72 through the overlapping groove 12 on the overlapping portion 11, which helps to shorten the axial dimension of the inner casing 71.

[0051] like Figure 1 As shown, in this embodiment, the second end of the overlapping part 11 is provided with an inclined end face 13 for forming an inclined annular air intake channel with the outer ring 73 of the compressor rotor. The inclination angle of the inclined end face 13 is 30°~60°.

[0052] Optionally, the bow-shaped transition structure is connected to the inner casing 71 and the outer casing respectively to form a front cavity 76 in the first direction and a rear cavity 77 in the second direction, thereby isolating gases of different temperatures on both sides.

[0053] It should be understood that the gas temperature in the front chamber 76 is lower than the gas temperature in the rear chamber 77, but since the temperature of the turbine components is much higher than that of the compressor, the gas in the rear chamber 77 is still equivalent to cryogenic cooling gas for the turbine components.

[0054] like Figure 1 As shown, specifically, the inclined end face 13 and the outer ring 73 of the compressor rotor form an inclined annular air intake channel, so as to introduce the gas in the rear cavity 77 into the turbine component through the annular air intake channel to provide cooling for the turbine component; when the inclination angle of the inclined end face 13 is between 30° and 60°, it can ensure a certain flow area and reduce the flow loss of airflow.

[0055] like Figure 2 As shown, the compressor of this embodiment includes the aforementioned bow-shaped transition structure. Specifically, by employing the aforementioned bow-shaped transition structure in the compressor, it is beneficial to the processing and manufacturing of the outer casing and the inner casing 71, and it is possible to achieve deformation coordination between the inner casing 71 and the outer casing, as well as reduce vibration transmission between the inner casing 71 and the outer casing.

[0056] like Figure 2 As shown, in this embodiment, the compressor also includes an inner casing 71, an outer casing, a stator component 72, and a rotor outer ring 73. The outer casing includes a front casing 74 and a rear casing 75. The inner casing 71, the bow-shaped transition structure, and the front casing 74 enclose to form a front cavity 76, and the bow-shaped transition structure and the rear casing 75 enclose to form a rear cavity 77.

[0057] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0058] In summary, after reading the detailed disclosure of this specification, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that this specification requires various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this specification and are within the spirit and scope of the exemplary embodiments described herein.

[0059] Furthermore, certain terms in this specification have been used to describe embodiments of this specification. For example, "an embodiment," "an embodiment," and / or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with that embodiment may be included in at least one embodiment of this specification. Therefore, it is to be emphasized and understood that two or more references to "an embodiment" or "an embodiment" or "alternative embodiment" in various parts of this specification do not necessarily refer to the same embodiment. Moreover, specific features, structures, or characteristics may be suitably combined in one or more embodiments of this specification.

[0060] It should be understood that in the foregoing description of the embodiments in this specification, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the description and aiding in the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this specification. That is, the embodiments in this specification can also be understood as an integration of multiple secondary embodiments. It is also valid when each secondary embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0061] Every patent, patent application, publication of the patent application, and other materials, such as articles, books, specifications, publications, documents, articles, etc., referenced in this invention may be incorporated herein by reference. The entire contents used for all purposes, except for any related litigation history, may be consistent with or conflict with this invention, or any similar litigation history that may have a limiting effect on the widest scope of the claims, and may be now or thereafter associated with this invention. For example, in the event of any inconsistency or conflict between the description, definition, and / or use of terms related to this invention in connection with any included material, the terminology used herein shall prevail.

[0062] Finally, it should be understood that the embodiments disclosed in this application are illustrative of the principles of the embodiments in this specification. Other modified embodiments are also within the scope of this specification. Therefore, the embodiments disclosed in this specification are merely examples and not limitations. Those skilled in the art can implement the applications in this specification using alternative configurations based on the embodiments in this specification. Therefore, the embodiments in this specification are not limited to the embodiments precisely described in the applications.

Claims

1. An arc-shaped adapter structure for connecting to an inner casing (71) and an outer casing respectively, characterized in that, The device includes a first axial portion (10) extending in a first direction along the axial direction, a first radial portion (20) extending radially outward from the first end of the first axial portion (10), a second axial portion (30) extending radially outward from the outer end of the first radial portion (20), a second radial portion (40) extending radially outward from the second end of the second axial portion (30), a third axial portion (50) extending radially outward from the outer side of the second radial portion (40), and a third radial portion (60) extending radially outward from the third axial portion (50). The first radial portion (20) is used to connect with the inner casing (71) in the axial direction by fasteners and to radially abut against the outer side wall of the inner casing (71). The third axial portion (50) is used to radially abut against the inner wall surface of the outer casing. The third radial portion (60) is used to connect with the outer casing in the axial direction by fasteners. The first direction and the second direction are opposite. The axial length of the first axial portion (10) is greater than the axial lengths of the second axial portion (30) and the third axial portion (50).

2. The bow-shaped transition structure according to claim 1, characterized in that, The second radial portion (40) is divided into a connecting portion one (41) and a connecting portion two (42) along the radial center. The first axial portion (10), the first radial portion (20), the second axial portion (30) and the connecting portion one (41) are integrally formed. The connecting portion two (42), the third axial portion (50) and the third radial portion (60) are integrally formed. The outer end of the connecting portion one (41) and the inner end of the connecting portion two (42) are connected.

3. The bow-shaped transition structure according to claim 1, characterized in that, The first end of the third axial portion (50) is provided with an abutment portion (51) that extends radially outward, the abutment portion (51) being used to radially abut against the inner sidewall of the outer casing.

4. The bow-shaped transition structure according to claim 3, characterized in that, The third radial portion (60) has a centrally located connecting hole (61) for connecting fasteners. The abutting portion (51) includes a stop (52) on the first side of the third radial portion (60) and a stop (53) on the second side of the third radial portion (60). The stop (52) is used to cooperate with the outer casing on the first side of the third radial portion (60), and the stop (53) is used to cooperate with the outer casing on the second side of the third radial portion (60).

5. The bow-shaped transition structure according to claim 4, characterized in that, The radial thickness of the abutment part (51) is 4mm to 7mm.

6. The bow-shaped transition structure according to any one of claims 1-5, characterized in that, The first radial portion (20) has a connecting hole 2 (21) for connecting fasteners in the center, and a stop 3 (22) for engaging with the outer wall surface of the inner casing (71) is provided on the inner end of the first radial portion (20).

7. The bow-shaped transition structure according to any one of claims 1-5, characterized in that, The axial thickness of the first radial part (20) is 4mm to 6mm.

8. The bow-shaped transition structure according to any one of claims 1-5, characterized in that, The second end of the first axial portion (10) is provided with an overlapping portion (11) extending radially inward, and the first end of the overlapping portion (11) is provided with an overlapping groove (12) formed axially inward for overlapping with the stator component (72) of the compressor.

9. The bow-shaped transition structure according to claim 8, characterized in that, The second end of the overlapping part (11) is provided with an inclined end face (13) for forming an inclined annular air intake channel with the outer ring (73) of the compressor rotor. The inclination angle of the inclined end face (13) is 30°~60°.

10. A compressor, characterized in that, Includes the bow-shaped adapter structure as described in any one of claims 1-9.

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