Active variable cross-section adjusting mechanism for inlet of centrifugal compressor

Abstract

The invention provides an active variable cross-section adjusting mechanism for an inlet of a centrifugal compressor, which comprises a base which is integrally in the shape of a hollow cylinder, and one end of the base is fixed on a rim cover plate of the centrifugal compressor through a fixing piece; the power disc serves as a power transmission mechanism and is arranged between the other end of the base and the centrifugal compressor inlet pipeline in a rotatable mode. The multiple blades are arranged in the inner cavity of the base, are arranged in the circumferential direction of the inner cavity to form an annular structure, are in irregular geometry shapes, are connected with the power disc and can move in the cavity of the base along with rotation of the power disc, and a plurality of protruding cylindrical transmission parts are arranged on the face, facing the base, of the power disc in the circumferential direction; grooves are formed in the ends, opposite to the power disc face, of the multiple blades correspondingly, the multiple protruding cylindrical transmission parts of the power disc are inserted into the grooves and slide, and the directions of the cylindrical transmission parts in the cavity of the base are changed under the driving of rotation of the power disc. The through-flow area of the centrifugal compressor inlet pipeline is directly controlled from the physical geometry level.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and in particular to an active variable cross-section regulating mechanism for an inlet of a centrifugal compressor. Background Art

[0002] In traditional centrifugal compressors, the inlet flow area of ​​the centrifugal impeller is usually kept at a fixed size. After design and manufacturing, the size of the inlet flow area of ​​the centrifugal compressor is difficult to change.

[0003] When a centrifugal compressor operates at low flow rates, off-design conditions, separation often occurs at the impeller inlet tip. This separated low-energy fluid, under the influence of an adverse pressure gradient, forms a reverse flow, often overflowing the impeller inlet section against the main flow direction, continuing in the opposite direction along the inner wall of the centrifugal compressor inlet duct, and aerodynamically interfering with the airflow within the duct, degrading the compressor's aerodynamic performance and potentially triggering compressor surge. Summary of the Invention

[0004] In view of this, the present invention proposes an active variable cross-section adjustment mechanism for a centrifugal compressor inlet, which can at least solve the aforementioned technical problems.

[0005] According to one aspect of the present invention, there is provided a centrifugal compressor inlet active variable cross-section adjustment mechanism for being installed at the front end of the centrifugal compressor impeller to adjust the cross-section of the inlet pipeline, the centrifugal compressor inlet active variable cross-section adjustment mechanism comprising: a base, which is a hollow cylindrical base as a whole, and one end of which is fixed to the centrifugal compressor wheel rim cover by a fixing member; a power disc, which serves as a power transmission mechanism and is rotatably arranged between the other end of the base and the centrifugal compressor inlet pipeline; and a plurality of blades, which are arranged in the internal cavity of the base. In the middle, the blades are arranged in an annular structure along the circumference of the internal cavity, and are irregular geometric shapes respectively, and are connected to the power disk, and can move in the cavity of the base as the power disk rotates. The surface of the power disk facing the base is circumferentially provided with a plurality of raised cylindrical transmission parts, and the ends of the plurality of blades facing the power disk are respectively provided with grooves for the plurality of raised cylindrical transmission parts of the power disk to be inserted therein and slide, and the rotation of the power disk drives the rotation of the power disk to change the orientation in the cavity of the base.

[0006] In some embodiments, the multiple blades are respectively in a structure that gradually shrinks from the outside of the internal cavity of the base toward the center side of the internal cavity of the base, and in a structure that gradually expands from the fluid inlet portion near the power disk side toward the fluid outlet portion near the base side. The multiple blades are assembled and matched with each other to form a tapered channel from the fluid inlet portion toward the fluid outlet portion.

[0007] In some embodiments, the edge portions of the plurality of blades located at the center side of the inner cavity of the base are in the shape of a gradually decreasing slope formed by being obliquely cut from the fluid inlet portion toward the fluid outlet portion.

[0008] In some embodiments, the tapered channel formed by the plurality of blades has a step structure with a suddenly increased radius at the outlet end, forming a reverse recirculation zone.

[0009] In some embodiments, the surface of the portion of the step structure close to the center of the pipeline is inclined from the outside of the pipeline toward the center of the pipeline relative to the inlet plane of the centrifugal compressor, thereby twisting the velocity direction of the airflow outflowing from the recirculation area.

[0010] In some embodiments, the surface of the portion of the step structure close to the center side of the pipeline is inclined less than 30 degrees from the outside of the pipeline toward the center side of the pipeline relative to the inlet plane of the centrifugal compressor, thereby twisting the direction of the airflow and reducing the viscous flow loss in the recirculation zone.

[0011] In some embodiments, the surfaces of the plurality of blades on the fluid outlet side are shaped to be inclined from the outside of the pipeline toward the center of the pipeline relative to the inlet plane of the centrifugal compressor.

[0012] In some embodiments, the planar shape of the internal cavity of the base is a shape having a concave-convex structure along the circumference, and the concave-convex structure is used to constrain the position and movement of the plurality of blades in the internal cavity.

[0013] In some embodiments, the planar shape of the inner cavity of the base is a zigzag shape along the circumferential direction.

[0014] In some embodiments, the grooves of the plurality of blades are arranged radially diverging from the center to the outer edge of the inner cavity.

[0015] According to the present invention, the flow area of ​​the centrifugal compressor inlet duct can be directly controlled from a physical and geometric perspective. By cooperating with multiple blades, a tapered channel can be formed in the centrifugal compressor inlet duct, guiding the fluid within the duct toward the center of the duct. By forming a reverse recirculation zone, the reverse flow of gas near the inner wall of the duct can be controlled. By applying the present invention, the aerodynamic performance of the centrifugal compressor under low-flow, off-design conditions can be effectively improved, and the surge boundary flow rate can be significantly reduced, thereby increasing the surge margin of the centrifugal compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0017] Figure 1 This is a schematic diagram of an example of a centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention being installed on a centrifugal compressor;

[0018] Figure 2 Schematic diagram of the main components of the centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of a base in a centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of a power disc in a centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of a blade in an active variable cross-section adjustment mechanism for a centrifugal compressor inlet according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the blades, power disc and base in the centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0024] The present invention provides a new centrifugal compressor inlet active variable cross-section adjustment mechanism, which can be installed at the inlet of the centrifugal compressor. Through the cooperation between multiple blades and the power disk, the cross-sectional area of ​​the fluid inlet pipeline of the centrifugal compressor is directly adjusted from the physical and geometric level.

[0025] The essence of the technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0026] Figure 1A schematic diagram shows an example of a situation where the centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention is installed on a centrifugal compressor.

[0027] like Figure 1 As shown, the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 of this embodiment is added to the inlet of the centrifugal compressor 200 and fixed on the wheel rim cover 210 of the centrifugal compressor 200 so as to be connected to the inlet of the centrifugal compressor 200, thereby directly controlling the cross-section change of the inlet pipe 220 of the centrifugal compressor 200.

[0028] Specifically, the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 of this embodiment changes the position of the cylindrical transmission component raised at the bottom of the power disk in the groove of the blade by rotating the power disk, thereby controlling the orientation of the blade in the base cavity. Through the geometric arrangement of multiple blades, the central geometric cross-section of the inlet pipe 220 is reconstructed to form a tapered channel, thereby improving the inlet velocity distribution of the fluid on the basis of changing the size of the flow area of ​​the pipeline.

[0029] Figure 2 This is a schematic diagram of the main components of the centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention.

[0030] like Figure 2 As shown, the main components of the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 of this embodiment include: a base 1, which is a hollow cylindrical shape as a whole, and has circumferentially protruding fixing parts at both ends, and the fixing parts are provided with screw holes for connection and fixation, so that one end of the base 1 can be fixed to the rim cover 210 of the centrifugal compressor 200; a power disk 2, which is a power transmission mechanism and is rotatably arranged between the other end of the base 1 and the inlet pipe 220 of the centrifugal compressor 200; a plurality of blades 3, which are arranged in the internal cavity of the base 1 and are arranged along the circumference of the internal cavity, and are irregular geometric shapes, and are connected to the power disk 2, and can move in the cavity of the base 1 as the power disk 2 rotates; a manual rocker 4, which is connected to the power disk 2 as a power source and is manually operated to drive the power disk 2 to rotate. Among them, the surface of the power disk 2 facing the base 1 is circumferentially provided with a plurality of raised cylindrical transmission components, and the ends of the plurality of blades 3 facing the power disk 2 are respectively provided with grooves, into which the raised cylindrical transmission components at the bottom of the power disk 2 can be inserted and slid, so that when the power disk 2 receives the power of the manual rocker 4 and rotates, it drives the blades 3 to move, changes the orientation of the blades 3 in the cavity of the base 1, and reconstructs the cross-section of the inlet pipeline 220 of the centrifugal compressor 200, thereby realizing the function of adjusting the change of the pipeline cross-section.

[0031] The working process of the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 of this embodiment is as follows: the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 is installed on the front end of the impeller of the centrifugal compressor 200 through the base 1, and the base 1 is fixed to the wheel rim cover 210 of the centrifugal compressor 200 by screws; a force is applied to the manual rocker 4 to drive the power disk 2 to rotate, thereby changing the position of the cylindrical transmission component of the power disk 2 in the groove of the multiple blades 3, and driving the multiple blades 3 to move; the multiple blades 3 move and change their orientation in the cavity of the base 1, and through the mutual arrangement and cooperation of the multiple blades 3, a variable pipeline cross-section is re-constructed, thereby directly controlling the flow area of ​​the inlet pipeline from a physical and geometric level.

[0032] Figure 3 It is a schematic diagram of a base in a centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention.

[0033] The main function of the base 1 in the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 of this embodiment is to fix the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 to the rim cover of the centrifugal compressor and provide space required for the movement of multiple blades 3.

[0034] like Figure 3 As shown, the base 1 includes a cylindrical body 11, a fixing member 12 provided at one end of the cylindrical body 11 and protruding circumferentially, a fixing member 13 provided at the other end of the cylindrical body 11 and protruding circumferentially, and a cavity 14 provided inside the cylindrical body 11.

[0035] The fixing member 12 at one end of the base 1 serves as a base, abutting against the wheel rim cover 210 of the centrifugal compressor 200. The fixing member 13 at the other end is used to abut against the power disk 2. The two fixing members 12 and 13 contain multiple screw holes 15 and 16, which can be used to secure the base 1 to the inlet of the centrifugal compressor 200 via screws.

[0036] The cavity 14 in the main body of the base 1 can accommodate multiple blades 3 and allow the multiple blades 3 to move therein. In this embodiment, the planar shape of the cavity 14 is set to a special shape that can constrain the position and movement of the multiple blades 3 in the cavity 14, so that the cavity 14 and the multiple blades 3 can better cooperate with each other to limit the position and movement of the blades 3 in the cavity 14. In this embodiment, Figure 3 As shown, the planar shape of the cavity 14 is circumferentially set to a sawtooth shape that matches the position and movement of the blade 3 in the cavity 14, but is not limited to this. The cavity 14 can also be circumferentially set to other shapes with concave and convex structures such as waves and pulses as needed.

[0037] Figure 4Schematic diagram of a power disc in a centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention. Figure 5 Schematic diagram of the blades in the active variable cross-section adjustment mechanism of the centrifugal compressor inlet according to the embodiment of the present invention. Figure 6 This is a schematic diagram of the blades, power disc and base in the centrifugal compressor inlet active variable cross-section adjustment mechanism according to an embodiment of the present invention.

[0038] In the centrifugal compressor inlet active variable cross-section adjustment mechanism 100 of this embodiment, the power disc 2 and the blades 3 are important components of the centrifugal compressor inlet active variable cross-section adjustment mechanism 100. The power disc 2 has the function of transmitting external force to the blades 3 and controlling the orientation of the blades 3. The multiple blades 3 cooperate with each other to re-construct a variable pipeline cross-section.

[0039] Specifically, if Figure 4-6 As shown, in this embodiment, a plurality of raised cylindrical transmission components 21 are circumferentially provided on one side of the power disk 2 facing the base 1. A plurality of blades 3 are respectively provided with grooves 31 of a certain length on the side facing the power disk 2, in which the cylindrical transmission components 21 on the power disk 2 can slide back and forth, and the plurality of blades 3 are placed as a whole in the cavity 14 of the base 1. When the power disk 2 rotates, the cylindrical transmission component 21 at the bottom slides in the grooves 31 of the plurality of blades 3, driving the plurality of blades 3 to move in the cavity 14 of the base 1, thereby changing the orientation of the plurality of blades 3 in the cavity 14 of the base 1, so that the plurality of blades 3 are aggregated from the outside toward the center of the cavity 14 or dispersed from the center of the cavity 14 to the outside, so as to increase or decrease the cross-section of the pipeline.

[0040] like Figure 4 As shown, the other side of the power disc 2 is connected to the inlet pipe 220 of the centrifugal compressor 200, and a manual rocker 4 is also connected to this side.

[0041] like Figure 5 As shown, the blades 3 are irregularly shaped, with multiple blades 3 assembled and matched to form a roughly annular structure along the circumference of the internal cavity 14. Furthermore, as mentioned above, each of the blades 3 facing the power disk 2 is provided with a groove 31 of a certain length. Each groove 31 radiates from the center of the internal cavity 14 toward the outer edge, allowing the blades 3 to converge toward the center of the cavity 14 or disperse outward from the center of the cavity 14 as the power disk 2 rotates.

[0042] Furthermore, the blades 3 have a structure that gradually shrinks from the outside of the internal cavity 14, that is, the outside of the pipeline, toward the center of the internal cavity 14, that is, the center of the pipeline, and have a structure that gradually expands from the fluid inlet portion 32 on the side of the power disk 2 toward the fluid outlet portion 33 on the side of the base 1, so that multiple blades 3 cooperate with each other to form a gradually shrinking channel from the fluid inlet portion 32 toward the fluid outlet portion 33, thereby reducing the pressure and increasing the speed of the incoming flow.

[0043] In a preferred embodiment, the ridges 34 of the plurality of blades 3 located at the center of the internal cavity 14 are shaped like gradually tapering slopes cut away from the fluid inlet 32 ​​toward the fluid outlet 33. This further facilitates the assembly and matching of the plurality of blades 3 to form a tapered channel from the fluid inlet 32 ​​toward the fluid outlet 33.

[0044] Furthermore, in a preferred embodiment, the surface of the outlet portion 33 of the blade 3, which is closer to the base 1, has a stepped structure 35, thereby forming a reverse recirculation zone, which can improve the fluid inlet velocity distribution and enhance compressor performance. Further preferably, the surface 36 of the portion of the stepped structure 35, which is closer to the pipeline center, is inclined from the pipeline exterior toward the pipeline center relative to the compressor inlet plane, with a certain inclination angle, for example, less than 30 degrees, such as 12 degrees. This creates a more effective reverse recirculation zone and improves the fluid inlet velocity distribution.

[0045] Reference Figure 4-6 The working process of the power disc 2 and blades 3 is as follows: after power is applied to the manual rocker 4, the power disc 2 rotates, and the cylindrical transmission component 21 at the bottom of the power disc 2 slides in the groove 31 at the top of the blade 3, transmitting power to the multiple blades 3, driving the multiple blades 3 to move within the cavity 14 of the base 1, thereby changing the position of the multiple blades 3 and, in turn, the annular structure formed by the multiple blades 3. As a result, the multiple blades 3 are re-aligned to form a new pipeline geometric cross-section. Furthermore, through the above-mentioned specific structure of the blades 3, on the basis of changing the size of the pipeline cross-section, a tapered channel and a reverse recirculation zone are formed, improving the inlet velocity distribution of the fluid and enhancing compressor performance.

[0046] The present invention utilizes a design for an active variable cross-section adjustment mechanism at the centrifugal compressor inlet based on a specialized iris structure. By varying the coordination of multiple blades, these blades combine to reconstruct the pipeline's physical geometric cross-section, directly controlling the cross-section variation at a physical and geometric level. Furthermore, by forming a tapered channel and a recirculation zone at the outlet, angled at a predetermined angle relative to the centrifugal compressor inlet, the tapered channel guides the gas within the pipeline toward its center. The recirculation zone controls reverse flow near the inner wall of the pipeline, effectively extending the centrifugal compressor's surge margin and improving its aerodynamic performance under low-flow, off-design conditions.

[0047] Furthermore, the combination of movable multiple blades allows for more precise control of pipe cross-section changes, while the simple mechanical design reduces the cost of controlling pipe cross-section changes.

[0048] Specifically, the present invention has the following advantages over the prior art:

[0049] 1) After being installed at a predetermined centrifugal compressor inlet position, the present invention controls the orientation of the blades by changing the position of the cylindrical transmission component at the bottom of the power disc in the groove at the top of the blades, and reconstructs the geometric shape of the central pipeline by cooperating with multiple blades, thereby changing the size of the inlet pipeline cross-section. Compared with the prior art, the present invention fundamentally changes the size of the inlet pipeline cross-section from an actual physical geometric perspective. At the same time, due to the special shape design of the blades, the cross-section in the direction of the blade inlet presents a tapered channel, and the outlet side has a reverse reflow zone, which effectively controls the mainstream and reverse flows, reduces the aerodynamic interference strength between the reverse flow and the mainstream, expands the surge margin of the rear centrifugal compressor, and improves the aerodynamic performance of the centrifugal compressor under low-flow non-design conditions.

[0050] 2) The blades of the present invention can be designed according to different actual production needs to produce blade shapes that meet production needs. Compared with the existing technology, the present invention can directly control the changes in pipeline cross-sections at multiple levels, multiple angles, and multiple ranges by replacing different blades, and has a certain degree of solution flexibility.

[0051] 3) The power source of the power disc of this invention can be selected by the user, either manually controlling the pipe cross-section or automatically controlling it via a servo motor or motor. Compared to existing technologies, this invention allows for traditional manual control of pipe cross-section size, as well as direct control of the blade rotation direction and form through the design of an automatic control circuit.

[0052] 4) Each component of the present invention can be replaced or selected according to actual production needs. The overall mechanical structure adopts a modular design, which is convenient for installation, disassembly, replacement, maintenance, and upgrading in the subsequent actual production process, and can fully meet the needs of changes in the cross-section of current mainstream fluid machinery pipelines.

[0053] It should be noted that although the above examples are mainly applied to centrifugal compressors, the present invention can be equally applied to other fluid machinery, such as steam turbines, gas turbines, water pumps and other pipelines. According to different production scenarios, it is sufficient to change the corresponding design by following the core idea of ​​the present invention.

[0054] In addition, in the above embodiment, a manual rocker 4 for manual operation is used as an example as a power source for adjusting the cross-section of the centrifugal compressor inlet pipe. However, as long as it can provide power to rotate the power disk 2, any manual or electric power source can be used. For example, a servo motor or motor can also be used instead of the manual rocker 4 as a power source.

[0055] In addition, in the above embodiment, it is described that the surface 36 of the portion of the step structure 35 on the outlet portion 33 side of the blade 3 close to the center of the pipeline is inclined toward the center of the pipeline relative to the compressor inlet plane, but the step portion can also be omitted, and the surface on the outlet portion 33 side of the blade 3 can be directly set to a certain inclination angle relative to the compressor inlet plane to form a reverse recirculation zone of the fluid.

[0056] The above description is merely an embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An active variable cross-section adjustment mechanism for a centrifugal compressor inlet, characterized in that: It is used to be installed at the front end of the centrifugal compressor impeller to adjust the flow area of ​​the inlet pipe. The centrifugal compressor inlet active variable cross-section adjustment mechanism includes: The base is in the shape of a hollow cylinder, and one end of the base is fixed to the centrifugal compressor wheel rim cover by a fixing member; a power disc, serving as a power transmission mechanism, rotatably disposed between the other end of the base and the centrifugal compressor inlet pipeline; and A plurality of blades are disposed in the internal cavity of the base and arranged in an annular structure along the circumference of the internal cavity. The blades are irregularly shaped and connected to the power disk. The blades can move in the cavity of the base as the power disk rotates. The surface of the power disc facing the base is provided with a plurality of protruding cylindrical transmission components along the circumferential direction. The ends of the multiple blades facing the power disc are respectively provided with grooves for the multiple raised cylindrical transmission components of the power disc to be inserted and slide therein, and are driven by the rotation of the power disc to change their orientation in the cavity of the base.

2. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 1, characterized in that: The plurality of blades are each configured to gradually decrease in size from the outside of the internal cavity of the base toward the center of the internal cavity of the base, and to gradually increase in size from the fluid inlet portion close to the power disc toward the fluid outlet portion close to the base. The plurality of blades are assembled and matched with each other to form a tapered channel from the fluid inlet portion toward the fluid outlet portion.

3. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 2, characterized in that: The edge portions of the plurality of blades located on the center side of the inner cavity of the base are in the shape of a gradually narrowing slope formed by being cut obliquely from the fluid inlet portion toward the fluid outlet portion.

4. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 2, characterized in that: The tapered channel formed by the plurality of blades has a step structure with a suddenly increased radius at the outlet end, forming a reverse reflow zone.

5. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 4, characterized in that: The surface of the portion of the step structure close to the center of the pipeline is inclined from the outside of the pipeline toward the center of the pipeline relative to the inlet plane of the centrifugal compressor, thereby twisting the velocity direction of the airflow outflowing from the recirculation area.

6. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 4, characterized in that: The surface of the portion of the step structure close to the center of the pipeline is inclined less than 30 degrees from the outside of the pipeline toward the center of the pipeline relative to the inlet plane of the centrifugal compressor, thereby twisting the direction of the airflow and reducing the viscous flow loss in the recirculation zone.

7. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 2, characterized in that: The surfaces of the plurality of blades on the fluid outlet side are shaped to be inclined from the outside of the pipeline toward the center of the pipeline with respect to the inlet plane of the centrifugal compressor.

8. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 1, characterized in that: The planar shape of the internal cavity of the base is a shape having a concave-convex structure along the circumferential direction, and the concave-convex structure is used to constrain the positions and movements of the plurality of blades in the internal cavity.

9. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 8, characterized in that: The planar shape of the inner cavity of the base is a sawtooth shape along the circumferential direction.

10. The centrifugal compressor inlet active variable cross-section adjustment mechanism according to claim 1, characterized in that: The grooves of the plurality of blades are arranged radially from the center to the outer edge of the inner cavity.

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