Split type volute assembly of centrifugal air compressor
Through the design of split volute shell assembly, threaded connections and O-ring sealing, the shortcomings of the existing integrated volute shell design in research and development and maintenance are solved, and the effect of simple structure and easy optimization and maintenance is achieved.
Patent Information
- Application Number
- CN202510438088.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-06-10
AI Technical Summary
The volute shell of the existing centrifugal air compressor is designed as integrated casting, which makes it difficult to accurately simulate gas flow during the research and development process, resulting in performance deviations, and the impeller is easily damaged under harsh working conditions, so the entire set of volute shells needs to be replaced, which is costly.
The split volute shell assembly design is adopted, including the wheel cover body, volute shell body and O-ring. It is threaded connection and O-ring sealed to realize the disassembly connection between the wheel cover and the volute, which is easy to optimize and repair.
It achieves simple structure, easy maintenance and optimization, reduces R&D and maintenance costs, and improves the flexibility and airtightness of centrifugal air compressors.
Smart Images
Figure CN120120286A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of centrifugal air compressors, and particularly to a split volute component for a centrifugal air compressor. Background Art
[0002] As one of the core pneumatic components of a centrifugal air compressor, the volute functions to recover the gas from the impeller, guide the gas to flow in a specific direction, and at the same time convert the kinetic energy of the gas into pressure energy. Most of the existing volutes are integrally cast volutes, which include an impeller inlet section, a shroud section, a vaneless diffuser section, and a volute section. When developing a new model, it is necessary to continuously iterate and optimize the impeller, diffuser, and volute through numerical simulation to determine the final pneumatic structure. However, the gas flow inside the centrifugal air compressor is very complex, and it is difficult to obtain accurate results through numerical simulation. Therefore, there will be a certain deviation between the performance of the designed air compressor and the actual test results, and even deviate far from the expectation. When the actual test performance is poor, it is necessary to readjust the pneumatic structure and manufacture a prototype. Since the integral volute is a casting process, scrapping and remolding will result in high R & D costs and time losses. In addition, the impeller and volute of the traditional air compressor are bound together, forming a "one machine, one shell" design. When the air compressor needs to expand the application scenario and optimize the impeller performance, the flexibility is insufficient. Moreover, under harsh working conditions, the impeller of the air compressor is prone to damage, and there may be a phenomenon of rubbing against the shroud or even the blade breaking and damaging the integral volute. When replacing, the whole volute needs to be replaced, resulting in high costs. Summary of the Invention
[0003] In view of this, the purpose of the present invention is to provide a split volute component for a centrifugal air compressor, which has the characteristics of simple structure, convenient maintenance, and fast optimization and iterative design.
[0004] To achieve the above purpose, the present invention adopts the following technical solution: A split volute component for a centrifugal air compressor includes a hub main body, a volute main body, and an O-ring; an inner connector is provided at the volute inlet section, and an outer connector is provided on the hub main body; the inner connector and the outer connector are connected so that the hub main body and the volute main body are detachably connected; a boss is provided at the volute inlet section, and the boss is provided with an O-ring groove; a groove is provided on one side of the hub main body facing the volute inlet section; a space for accommodating the O-ring is formed by the cooperation of the O-ring groove and the groove of the hub main body, so that the hub main body and the volute main body are hermetically connected.
[0005] In a preferred embodiment, the hub main body includes an impeller inlet section, a shroud section, and a vaneless diffuser section; the outer connector is provided at the end of the vaneless diffuser section; the groove is provided on one side of the vaneless diffuser section facing the volute main body.
[0006] In a preferred embodiment, the volute main body includes a volute inlet section, a volute internal flow passage, and a volute outlet section; the internal connection member is provided on the volute inlet section; an O-ring groove is provided on the surface of the volute inlet section facing the hub main body.
[0007] In a preferred embodiment, the internal connection member is specifically an internal thread, and the external connection member is specifically an external thread.
[0008] In a preferred embodiment, the impeller inlet section has a flared shape.
[0009] In a preferred embodiment, the volute inlet section is an annular structure.
[0010] In a preferred embodiment, the vaneless diffuser section is an annular structure constructed according to the ratio of the impeller outlet diameter and height, and it is an integral structure with the shroud section.
[0011] In a preferred embodiment, the area of the volute internal flow passage varies circumferentially, and the cross-section is a circular asymmetric cross-section.
[0012] In a preferred embodiment, the volute outlet section is a circular cross-section with a gradually increasing cross-sectional area, guiding the gas to flow into the next component.
[0013] In a preferred embodiment, the volute main body is formed by die casting.
[0014] In a preferred embodiment, the hub main body structure is formed by machining.
[0015] Compared with the prior art, the present invention has the following beneficial effects: simple structure, convenient for maintenance, high flexibility, conducive to accelerating the R & D design and reducing the R & D cost; when there are design, damage or adaptation problems with the hub main body or the volute main body, it is not necessary to replace the entire integrated volute, but only need to modify the manufacturing or directly replace the corresponding hub or volute main body structure, which is convenient and fast; the hub main body and the volute main body structure are fixed by threaded connection, and the groove surface of the hub main body is matched with the convex table surface of the volute main body and sealed with an O-ring, ensuring the airtightness of the overall structure; it is possible to modify the volute main body to adjust the operating condition range of the centrifugal air compressor design while retaining the existing excellent impeller design, that is, the corresponding hub main body structure remains unchanged; through the above methods, the R & D speed of the centrifugal air compressor can be increased, and the R & D cost and maintenance cost can be reduced; at the same time, the flexibility of the whole machine can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic structural distribution diagram of a split volute assembly of a centrifugal air compressor according to a preferred embodiment of the present invention; Figure 2This is a partially enlarged schematic diagram of the structural distribution of a split volute component of a centrifugal air compressor according to a preferred embodiment of the present invention. Detailed implementation manners
[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0018] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations for the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.
[0019] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0020] A split volute component of a centrifugal air compressor, referring to Figure 1-2 , includes a hub body 1, a volute body 2, and an O-ring 3; an inner connecting member is provided at the volute inlet section 21, and an outer connecting member is provided on the hub body 1; the inner connecting member is connected to the outer connecting member so that the hub body 1 and the volute body 2 are detachably connected; a boss 25 is provided at the volute inlet section 21, and an O-ring groove 26 is provided on the boss 25; a groove 15 is provided on one side of the hub body 1 facing the volute inlet section 21; a space for accommodating the O-ring 3 is formed by the cooperation of the O-ring groove 26 and the groove 15 of the hub body 1, so that the hub body 1 and the volute body 2 are hermetically connected.
[0021] Specifically, the hub body 1 includes an impeller inlet section 11, a shroud section 12, and a vaneless diffuser section 13; the outer connecting member is provided at the end of the vaneless diffuser section 13; the groove 15 is provided on one side of the vaneless diffuser section 13 facing the volute body 2.
[0022] Specifically, the volute body 2 includes a volute inlet section 21, a volute inner flow path 22, and a volute outlet section 23; the inner connecting member is provided at the volute inlet section 21; the O-ring groove 26 is provided on one side of the volute inlet section 21 facing the hub body 1.
[0023] Specifically, the inner connecting member is specifically an internal thread 24, and the outer connecting member is specifically an external thread 14.
[0024] Specifically, the impeller inlet section 11 has a flared shape.
[0025] Specifically, the inlet section 21 of the volute is of an annular structure.
[0026] Specifically, the vaneless diffuser section 13 is an annular structure constructed in proportion to the diameter and height of the impeller outlet, and it forms an integral structure with the shroud section 12. The shroud section 12 is a curved surface structure formed according to the impeller shape, and it forms an integral structure with the impeller inlet section 11; Specifically, the area of the internal flow passage 22 in the volute changes circumferentially, and the cross-section is a circular asymmetric cross-section.
[0027] Specifically, the outlet section 23 of the volute is a circular cross-section with a gradually increasing cross-sectional area, guiding the gas to flow into the next component.
[0028] Specifically, the volute main body 2 is formed by die casting.
[0029] Specifically, the structure of the hub main body 1 is formed by machining.
[0030] The hub main body 1 is connected, fixed or disassembled through the external thread 14 at the end of the vaneless diffuser section and the internal thread 24 of the volute main body 2, realizing the split function, which is convenient for R & D design and maintenance; the hub main body 1 is sealed through the groove 15 at the end of the vaneless diffuser, the boss 25 of the volute main body 2, the O-ring groove 26 and the O-ring 3, ensuring the airtightness after the connection is integrated; the impeller inlet section 11, the shroud section 12, the vaneless diffuser section 13, the volute inlet section 21, the internal flow passage 22 in the volute, and the volute outlet section 23 together constitute the internal gas passage of the centrifugal air compressor.
Claims
1. A split volute assembly for a centrifugal air compressor, characterized in that: It includes a wheel cover body, a volute body and an O-ring; the volute inlet section is provided with an inner connecting piece, and the wheel cover body is provided with an outer connecting piece; the inner connecting piece is connected with the outer connecting piece so that the wheel cover body and the volute body are detachably connected; the volute inlet section is provided with a boss, and the boss is provided with an O-ring groove; the wheel cover body is provided with a groove on one side facing the volute inlet section; a space for accommodating the O-ring is formed by the cooperation of the O-ring groove and the groove of the wheel cover body, so that the wheel cover body and the volute body are sealed and connected.
2. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The wheel cover body comprises an impeller inlet section, a wheel cover section and a bladeless diffuser section; the outer connecting piece is arranged at the end of the bladeless diffuser section; the groove is arranged on a side of the bladeless diffuser section facing the volute body.
3. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The volute body comprises a volute inlet section, a volute inner flow channel and a volute outlet section; the volute inlet section is provided with the inner connecting piece; and the O-ring groove is provided on a side of the volute inlet section facing the wheel cover body.
4. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The inner connecting piece is specifically an inner thread, and the outer connecting piece is specifically an outer thread.
5. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The impeller inlet section is in the shape of a bell mouth.
6. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The volute inlet section is an annular structure.
7. A split volute assembly for a centrifugal air compressor according to claim 5, characterized in that: The bladeless diffuser section is an annular structure constructed in proportion to the impeller outlet diameter and height, and is an integral structure with the wheel cover section.
8. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The flow channel area in the volute changes along the circumferential direction, and the cross section is a circular asymmetric cross section.
9. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The volute outlet section is a circular cross-section with a gradually increasing cross-sectional area, guiding the gas to flow into the next component.
10. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The volute body is formed by open mold casting.
11. A centrifugal air compressor split volute assembly according to claim 1, characterized in that: The main structure of the wheel cover is formed by machining.