Efficient pneumatic supporting plate and diffuser thereof

Abstract

The invention relates to the technical field of impeller machinery, in particular to an efficient pneumatic supporting plate and a diffuser thereof. The efficient pneumatic supporting plate comprises a linear part, a flow guide ring connecting part and a flow guide body connecting part, one end of the linear part is connected with a flow guide ring through the flow guide ring connecting part, and the other end of the linear part is connected with a flow guide body through the flow guide body connecting part; the joint of the flow guide ring connecting part and the linear part and the joint of the linear part and the flow guide main body connecting part are in arc transition; each of the straight line part, the flow guide ring connecting part and the flow guide main body connecting part comprises a semicircular part and a tail part, and the joint of the semicircular part and the tail part is in arc transition. The straight line part, the flow guide ring connecting part and the flow guide main body connecting part realize the semicircular part and the tail part of the flow guide ring and the flow guide main body, so that secondary flow structures such as flow separation and falling vortex are controlled, the flow loss is reduced, and the aerodynamic efficiency of various turbomachinery such as a steam turbine and an expansion machine is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of turbomachinery, and particularly relates to a high-efficiency pneumatic support plate and its diffuser for use in steam turbines, turboexpanders and turbines. Background Technology

[0002] A diffuser is a device that converts the kinetic energy of gas into pressure energy, and is widely used in equipment such as centrifugal compressors and aero engines. The main function of a diffuser is to convert the kinetic energy of high-speed gas into static pressure energy. After leaving the impeller, the gas enters the diffuser, where its velocity is reduced and its pressure is increased, thereby achieving gas pressurization.

[0003] Existing technology, such as patent CN113856717A, discloses a novel exhaust diffuser structure with a manifold that enhances aerodynamic performance. The structure includes a hub, a support plate, and a housing. The support plate connects the hub and the housing. The outer wall of the hub and the inner wall of the housing form an airflow channel, allowing intake airflow to pass between the surfaces of adjacent support plates. The structure also includes a manifold; the upper end of the manifold is fixed to the inner wall of the housing, while the lower end is suspended. This novel exhaust diffuser structure incorporates a manifold. The manifold structure can suppress flow separation near the support plate within the exhaust diffuser, reducing total pressure loss. Simultaneously, it improves the flow state at the exhaust diffuser outlet, reducing residual velocity loss and thus enhancing the static pressure recovery performance of the exhaust diffuser.

[0004] The aforementioned existing technology uses a flow divider, which can improve aerodynamic performance. However, the additional structure increases the complexity and cost of the equipment. Furthermore, as the operating conditions of the upstream impeller machinery change, the direction of the intake swirl will change, requiring further enhancement of adaptability to variable operating conditions. Summary of the Invention

[0005] In view of this, the present invention aims to provide a high-efficiency pneumatic support plate and its diffuser, so as to form a high-efficiency flow structure inside the diffuser through the structure of the support plate, thereby changing the undesirable flow structure such as flow separation, detached vortex, and wake loss, and realizing the efficient operation of various impeller machines such as steam turbines and expanders.

[0006] To achieve the above objectives, the technical solution created by this invention is implemented as follows: A high-efficiency pneumatic support plate is used to connect a coaxially arranged guide ring and a guide body. The guide body is disposed inside the guide ring, and a cavity is formed between the guide ring and the guide body. One end of the cavity is a guide inlet, and the other end of the cavity is a guide outlet. The high-efficiency pneumatic support plate includes a straight section, a guide ring connecting section, and a guide body connecting section. One end of the straight section is connected to the guide ring through the guide ring connecting section, and the other end of the straight section is connected to the guide body through the guide body connecting section. The connection between the guide ring connecting section and the straight section, as well as the connection between the straight section and the guide body connecting section, are all arc-shaped transitions. The straight section, the guide ring connecting section, and the guide body connecting section are integrally formed structures. The straight section, the guide ring connection section, and the guide body connection section all include a connected semi-circular section and a tail section. The connection between the semi-circular section and the tail section is a circular arc transition. The outer contour of the tail section is a Bézier curve trajectory, and the control points of the Bézier curve are P. Z1 P Z2 P Z3 P Z4 By integrating the straight section, the guide ring connection section, and the guide body connection section into a single unit, along with the semi-circular section, the tail section, and the overall height, the incoming flow resistance is reduced and the airflow characteristics under different working conditions are adapted.

[0007] Furthermore, the semi-circular end of the semi-circular part is positioned towards the airflow inlet, and the tail is positioned towards the airflow outlet, forming a streamlined arc shape with the windward and leeward sides through the semi-circular part and the tail.

[0008] Furthermore, the straight section, the guide ring connecting section, and the guide body connecting section all include a square section. The semi-circular section is connected to the tail section through the square section. The connection between the semi-circular section and the square section, and the connection between the square section and the tail section, are all arc-shaped transitions. The flow resistance is reduced by the outer contours of the square section, the tail section, and the semi-circular section.

[0009] Furthermore, the flow guide ring connection and the flow guide body connection are arranged in a symmetrical arc shape along the radial direction of the flow guide body; the flow guide ring connection and the flow guide body connection are arranged in an arc shape along the axial direction of the flow guide body and are respectively located on both sides of the straight section, thereby reducing the incoming flow resistance through the arc structure of the flow guide ring connection and the flow guide body connection.

[0010] Furthermore, the guide ring connection is arranged in a straight line along the radial direction of the guide body, and the guide body connection is arranged in an arc shape along the radial direction of the guide body; both the guide ring connection and the guide body connection are arranged in an arc shape along the axial direction of the guide body, and the flow resistance is reduced by the arc structure of the guide ring connection and the guide body connection.

[0011] Furthermore, the flow guide body connection is arranged in a straight line along the radial direction of the flow guide body, and the flow guide ring connection is arranged in an arc shape along the radial direction of the flow guide body; both the flow guide ring connection and the flow guide body connection are arranged in an arc shape along the axial direction of the flow guide body, and the flow resistance is reduced by the arc structure of the flow guide ring connection and the flow guide body connection.

[0012] Furthermore, the distance between the connection part of the guide body near the guide inlet and the connection part of the guide body and the end of the guide body near the guide inlet is d, the length of the guide body is L2, and the range of d is 0.01 times to 1 times L2, which is used to improve aerodynamic efficiency.

[0013] Furthermore, the radius of the guide ring near the guide inlet is R1, the radius of the guide ring near the guide outlet is R2, the radius of the guide body near the guide inlet is r, and the overall height of the straight section, the guide ring connection section, and the guide body connection section is H, with a minimum range of (R1-r) and a maximum range equal to R2; the width of the straight section along the axial direction of the guide body is W1, with W1 ranging from 0.01 to 1 times L2; ​​the width of the straight section along the radial direction of the guide body is W2, with W2 ranging from 0.01 to 1 times L2; ​​the radius of the semi-circular section is R... Z1 The length L of the square portion is 0.5 times that of W2. Z1 Subtract R from W1 Z1 The tail length is the control point P on the Bézier curve trajectory of the outer contour of the tail. Z1 The vertical distance to its connection with the square structure and P Z2 The sum of the vertical distances to the connection point of the straight section and the square structure; the vertical distance from the straight section along the axial direction of the guide body and the guide body is C1, where C1 ranges from 0.01 times to 1 times H; the vertical distance from the straight section along the radial direction of the guide body and the guide body is C2, where C2 ranges from 0.01 times to 1 times H; the length of the straight section along the axial direction of the guide body is h1, where h1 ranges from 0.0001 times to 1 times H; the length of the straight section along the radial direction of the guide body is h2, where h2 ranges from 0.0001 times to 1 times H, used to improve aerodynamic efficiency.

[0014] Furthermore, the included angle formed by the connection between the guide body and the connection point on the guide body along its axial direction and near the guide outlet is a1, with an angle range of 0-180°; the included angle formed by the connection between the guide ring and the connection point on the guide ring along the axial direction of the guide body and near the guide outlet is a2, with an angle range of 0-180°; the included angle formed by the connection between the guide body and the connection point on the guide body along its radial direction is a3, with an angle range of 0-180°; and the included angle formed by the connection between the guide ring and the connection point on the guide ring along the radial direction of the guide body is a4, with an angle range of 0-180°, which is used to improve aerodynamic efficiency.

[0015] A diffuser includes a flow guide ring and a flow guide body arranged coaxially. The flow guide ring and the flow guide body are connected by at least four sets of straight sections, flow guide ring connecting sections and flow guide body connecting sections, thereby reducing the incoming flow resistance.

[0016] Compared with the prior art, the present invention can achieve the following beneficial effects: (1) The straight section, guide ring connection section and guide body connection section of the present invention realize the semi-circular section and tail section between the guide ring and the guide body. The three-dimensional blade stacking technology is used to control the secondary flow structure such as flow separation and shedding vortex, reduce flow loss and improve the aerodynamic efficiency of various impeller machinery such as steam turbines and expanders.

[0017] (2) The semi-circular part and tail of the present invention achieve the arc streamline shape of the windward and leeward sides. Combined with the overall height of the straight part, the guide ring connection part and the guide body connection part, the incoming flow resistance can be reduced and adapted to the airflow characteristics under different working conditions. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the internal structure of a high-efficiency pneumatic support plate and its diffuser as described in Embodiment 1 of the present invention. Figure 2 A side view of a high-efficiency pneumatic support plate and its diffuser as described in Embodiment 1 of the present invention; Figure 3 for Figure 1 Cross-sectional view of the main connecting section of the central guide tube; Figure 4 This is a schematic diagram of the internal structure of a high-efficiency pneumatic support plate and its diffuser as described in Embodiment 2 of the present invention. Figure 5 A side view of a high-efficiency pneumatic support plate and its diffuser as described in Embodiment 2 of the present invention; Figure 6 for Figure 4 Cross-sectional view of the main connecting section of the central guide tube; Figure 7 This is a schematic diagram of the internal structure of a high-efficiency pneumatic support plate and its diffuser as described in Embodiment 3 of the present invention. Figure 8 A side view of a high-efficiency pneumatic support plate and its diffuser as described in Embodiment 3 of the present invention.

[0019] Explanation of reference numerals in the attached figures: 10. Flow guide ring; 11. Flow guide body; 12. Flow guide inlet; 13. Flow guide outlet; 20. Straight section; 21. Guide ring connection section; 22. Guide body connection section; 23. Semi-circular section; 24. Tail section; 25. Square section. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not constitute a limitation thereof.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The working medium types in this application include various gases, such as air, nitrogen, helium, argon, carbon dioxide, flue gas, natural gas, water vapor, etc. Any working medium not mentioned above but capable of performing work is also within the scope of protection of this patent. Example 1 like Figures 1 to 3 As shown in Embodiment 1 of this application, a high-efficiency pneumatic support plate is used to connect a coaxially arranged guide ring 10 and a guide body 11. The guide body 11 is disposed inside the guide ring 10, and a cavity is formed between the guide ring 10 and the guide body 11. One end of the cavity is a guide inlet 12, and the other end of the cavity is a guide outlet 13. The plate includes a straight section 20, a guide ring connecting section 21, and a guide body connecting section 22. One end of the straight section 20 is connected to the guide ring 10 through the guide ring connecting section 21, and the other end of the straight section 20 is connected to the guide body 11 through the guide body connecting section 22. The connection between the guide ring connecting section 21 and the straight section 20, as well as the connection between the straight section 20 and the guide body connecting section 22, are all arc-shaped transitions. The straight section 20, the guide ring connecting section 21, and the guide body connecting section 22 are integrally formed structures. The straight section 20, the guide ring connecting section 21, and the guide body connecting section 22 all include a connected semi-circular section 23 and a tail section 24. The connection between the semi-circular section 23 and the tail section 24 is a circular arc transition. The outer contour of the tail section 24 is a Bézier curve trajectory, and the control points of the Bézier curve are P. Z1 P Z2 P Z3 P Z4 P Z1 and P Z2 Located on one side of the main flow body 11, with P Z3 and P Z4 Located on the other side of the flow body 11, the semi-circular part 23, tail 24, and overall height of the integrally formed straight part 20, flow guide ring connecting part 21, and flow guide body connecting part 22 reduce the incoming flow resistance and adapt to the airflow characteristics under different working conditions.

[0026] The semi-circular end of the semi-circular part 23 is positioned towards the airflow inlet 12, and the tail 24 is positioned towards the airflow outlet 13. The semi-circular part 23 and the tail 24 form a streamlined arc shape on the windward and leeward sides.

[0027] The flow guide ring connection 21 and the flow guide body connection 22 are arranged in an arc shape symmetrically along the radial direction of the flow guide body 11; the flow guide ring connection 21 and the flow guide body connection 22 are arranged in an arc shape along the axial direction of the flow guide body 11 and are respectively arranged on both sides of the straight section 20, and the flow resistance is reduced by the arc structure of the flow guide ring connection 21.

[0028] The distance between the connection point of the flow guide body connecting part 22 near the flow guide inlet 12 and the connection point of the flow guide body 11 and the end of the flow guide body 11 near the flow guide inlet 12 is d. The length of the flow guide body 11 is L2. The range of d is 0.01 times to 1 times L2. When the range of d is 1 times L2, the flow guide body connecting part 22 is provided at the end of the tail 24 to improve aerodynamic efficiency.

[0029] The radius of the guide ring 10 near the guide inlet 12 is R1, the radius of the guide ring 10 near the guide outlet 13 is R2, and the radius of the guide body 11 near the guide inlet 12 is r. The overall height of the straight section 20, the guide ring connecting section 21, and the guide body connecting section 22 is H, where the minimum range of H is (R1-r), and the maximum range of H is equal to R2. The width of the straight section 20 along the axial direction of the guide body 11 is W1, where W1 ranges from 0.01 times to 1 times L2. When W1 is 1 times L2, the width of the straight section 20 is equal to that of the guide body 11. The width of the straight section 20 along the radial direction of the guide body 11 is W2, where W2 ranges from 0.01 to 1 times L2. The radius of the semi-circular section 23 is R... Z1 The length L of the square portion is 0.5 times that of W2. Z1 Subtract R from W1 Z1 The tail length is the control point P on the Bézier curve trajectory of the outer contour of the tail. Z1 The vertical distance to its connection with the square structure and P Z2 The sum of the vertical distances to the connection points with the square structure; the vertical distance C1 along the axial direction of the straight section 20 and from the guide body 11 is 0.01 times to 1 times H. When C1 is 1 times H, the support plate of this application is the guide body connection section 22, without the straight section 20 and the guide ring connection section 21; the vertical distance C2 along the radial direction of the straight section 20 and from the guide body 11 is 0.01 times to 1 times H. When C2 is 1 times H, the support plate of this application is the guide body connection section 22, without the straight section 20 and the guide ring connection section 21; the sum of the vertical distances to the straight section 20 and from the guide body 11 is 0.01 times to 1 times H. The straight section 20 and the guide ring connection section 21; the length of the straight section 20 along the axial direction of the guide body 11 is h1, and the range of h1 is 0.0001 times to 1 times H. When the range of h1 is 1 times H, the support plate of this application is the straight section 20, without the guide body connection section 22 and the guide ring connection section 21; the radial length of the straight section 20 along the guide body 11 is h2, and the range of h2 is 0.0001 times to 1 times H. When the range of h2 is 1 times H, the support plate of this application is the straight section 20, without the guide body connection section 22 and the guide ring connection section 21, which is used to improve aerodynamic efficiency.

[0030] The included angle formed by the connection between the guide body connecting part 22 and the connection point of the guide body 11 along its axial direction and near the guide outlet 13 is a1, with an angle range of 0-180°; the included angle formed by the connection between the guide ring connecting part 21 and the connection point of the guide ring 10 along its axial direction and near the guide outlet 13 is a2, with an angle range of 0-180°; the included angle formed by the connection between the guide body connecting part 22 and the guide body 11 along its radial direction is a3, with an angle range of 0-180°; and the included angle formed by the connection between the guide ring connecting part 21 and the guide ring 10 along its axial direction is a4, with an angle range of 0-180°, which is used to improve aerodynamic efficiency.

[0031] The guide ring 10 and the guide body 11 are connected by an integrally formed straight section 20, guide ring connecting section 21 and guide body connecting section 22. The straight section 20, guide ring connecting section 21 and guide body connecting section 22 all have a semi-circular section 23 and a tail section 24, that is, the arc-shaped streamline of the windward and leeward sides. Combined with the overall height H of the straight section 20, guide ring connecting section 21 and guide body connecting section 22, the incoming flow resistance can be reduced and adapted to the airflow characteristics under different working conditions.

[0032] The outer contour of the tail section 24 of the straight section 20, the guide ring connecting section 21 and the guide body connecting section 22 is a Bezier curve trajectory, which can be combined with the shape of the semi-circular section 23 to further optimize the guiding path of the incoming airflow, avoid airflow deflection or local vortices caused by cross-sectional asymmetry, and significantly reduce aerodynamic drag.

[0033] A diffuser includes a guide ring 10 and a guide body 11 arranged coaxially. The guide ring 10 and the guide body 11 are connected by at least four sets of straight sections 20, guide ring connecting sections 21 and guide body connecting sections 22. The straight sections 20, guide ring connecting sections 21 and guide body connecting sections 22 reduce the incoming flow resistance. The high-efficiency pneumatic support plate of this application is used to support the diffuser and the rotor bearing.

[0034] Example 2 For example, 4 to Figure 6 As shown, the high-efficiency pneumatic support plate of Embodiment 2 of this application differs from that of Embodiment 1 in that: the straight section 20, the guide ring connecting section 21, and the guide body connecting section 22 all include a square section 25, and the semi-circular section 23 is connected to the tail section 24 through the square section 25. The connection between the semi-circular section 23 and the square section 25, and the connection between the square section 25 and the tail section 24, are all arc-shaped transitions. The flow resistance is reduced by the outer contours of the square section 25, the tail section 24, and the semi-circular section 23.

[0035] The flow guide ring connection 21 is arranged in a straight line along the radial direction of the flow guide body 11, and the flow guide body connection 22 is arranged in an arc shape along the radial direction of the flow guide body 11; both the flow guide ring connection 21 and the flow guide body connection 22 are arranged in an arc shape along the axial direction of the flow guide body 11.

[0036] The side cross-sections of the straight section 20, the guide ring connecting section 21 and the guide body connecting section 22 have square sections 25. The two sides of the square section 25 are arranged in parallel. The outer contour of the tail section 24 is a Bezier curve trajectory, which can be combined with the shape of the semi-circular section 23 to further optimize the guide path of the incoming airflow, avoid airflow deflection or local vortices caused by cross-sectional asymmetry, and significantly reduce aerodynamic drag.

[0037] Embodiment 2 of this application can be used in an expander, and further in an expander applied in a compressed air energy storage system. The blades are disposed within the expander's cavity and rotate under the action of the driving gas, thereby driving the generator to operate and output electrical energy to the power-consuming equipment. The high-efficiency pneumatic support plate of this application is used to support the expander's diffuser and rotor bearings.

[0038] Example 3 like Figures 7 to 8 As shown, the high-efficiency pneumatic support plate of Embodiment 3 of this application differs from that of Embodiment 1 in that: The flow guide body connecting part 22 is arranged in a straight line along the radial direction of the flow guide body 11, and the flow guide ring connecting part 21 is arranged in an arc shape along the radial direction of the flow guide body 11; both the flow guide ring connecting part 21 and the flow guide body connecting part 22 are arranged in an arc shape along the axial direction of the flow guide body 11, and the flow resistance is reduced by the arc structure of the flow guide body connecting part 22.

[0039] The cross-sectional profile of the high-efficiency aerodynamic support plate of this application can adopt other combined shapes such as standard airfoils, biomimetic airfoils, and streamlined airfoils. The shape adopted is matched with the three-dimensional blade stacking shape to achieve the best aerodynamic effect.

[0040] This application is used to control secondary flow structures such as flow separation and shedding vortices, reduce flow losses, and improve the aerodynamic efficiency of various turbomachinery such as steam turbines and expanders.

[0041] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A high-efficiency pneumatic support plate for connecting a coaxially arranged flow guide ring (10) and a flow guide body (11), wherein the flow guide body (11) is disposed inside the flow guide ring (10), and a cavity is formed between the flow guide ring (10) and the flow guide body (11), one end of the cavity being a flow inlet (12) and the other end of the cavity being a flow outlet (13), characterized in that: The high-efficiency pneumatic support plate includes a straight section (20), a flow guide ring connecting section (21), and a flow guide body connecting section (22). One end of the straight section (20) is connected to the flow guide ring (10) through the flow guide ring connecting section (21), and the other end of the straight section (20) is connected to the flow guide body (11) through the flow guide body connecting section (22). The connection between the flow guide ring connecting section (21) and the straight section (20) and the connection between the straight section (20) and the flow guide body connecting section (22) are all arc transitions. The straight section (20), the flow guide ring connecting section (21), and the flow guide body connecting section (22) are integrally formed structures. The straight section (20), the guide ring connecting section (21), and the guide body connecting section (22) each include a connected semi-circular section (23) and a tail section (24). The connection between the semi-circular section (23) and the tail section (24) is a circular arc transition. The outer contour of the tail section (24) is a Bezier curve trajectory. The control points of the Bezier curve are P. Z1 P Z2 P Z3 P Z4 The semi-circular part (23), the tail (24), and the height are formed by the integrally molded straight part (20), the guide ring connecting part (21), and the guide body connecting part (22), which reduces the incoming flow resistance.

2. The high-efficiency pneumatic support plate according to claim 1, characterized in that: The semi-circular end of the semi-circular part (23) is positioned toward the flow inlet (12), and the tail (24) is positioned toward the flow outlet (13). The semi-circular part (23) and the tail (24) respectively form a streamlined arc shape on the windward and leeward sides.

3. The high-efficiency pneumatic support plate according to claim 1, characterized in that: The straight section (20), the guide ring connecting section (21), and the guide body connecting section (22) all include the square section (25). The semi-circular section (23) is connected to the tail section (24) through the square section (25). The connection between the semi-circular section (23) and the square section (25), and the connection between the square section (25) and the tail section (24) are all arc-shaped transitions. The flow resistance is reduced by the outer contours of the square section (25), the tail section (24), and the semi-circular section (23).

4. The high-efficiency pneumatic support plate according to claim 2 or 3, characterized in that: The flow guide ring connecting part (21) and the flow guide body connecting part (22) are arranged in an arc shape symmetrically along the radial direction of the flow guide body (11); the flow guide ring connecting part (21) and the flow guide body connecting part (22) are arranged in an arc shape along the axial direction of the flow guide body (11) and are respectively arranged on both sides of the straight part (20), thereby reducing the incoming flow resistance through the arc structure of the flow guide ring connecting part (21) and the flow guide body connecting part (22).

5. The high-efficiency pneumatic support plate according to claim 2 or 3, characterized in that: The flow guide ring connection (21) is arranged in a straight line along the radial direction of the flow guide body (11), and the flow guide body connection (22) is arranged in an arc shape along the radial direction of the flow guide body (11); the flow guide ring connection (21) and the flow guide body connection (22) are both arranged in an arc shape along the axial direction of the flow guide body (11), and the flow resistance is reduced by the arc structure of the flow guide ring connection (21) and the flow guide body connection (22).

6. The high-efficiency pneumatic support plate according to claim 2 or 3, characterized in that: The flow guide body connecting part (22) is arranged in a straight line along the radial direction of the flow guide body (11), and the flow guide ring connecting part (21) is arranged in an arc shape along the radial direction of the flow guide body (11); the flow guide ring connecting part (21) and the flow guide body connecting part (22) are both arranged in an arc shape along the axial direction of the flow guide body (11), and the flow resistance is reduced by the arc structure of the flow guide ring connecting part (21) and the flow guide body connecting part (22).

7. The high-efficiency pneumatic support plate according to claim 2 or 3, characterized in that: The distance between the connection part (22) of the flow guide body (22) near the flow guide inlet (12) and the connection point with the flow guide body (11) and the end of the flow guide body (11) near the flow guide inlet (12) is d, the length of the flow guide body (11) is L2, and the range of d is 0.01 times to 1 times the length of L2, which is used to improve aerodynamic efficiency.

8. The high-efficiency pneumatic support plate according to claim 7, characterized in that: The radius of the guide ring (10) near the guide inlet (12) is R1, the radius of the guide ring (10) near the guide outlet (13) is R2, the radius of the guide body (11) near the guide inlet (12) is r, the overall height of the straight section (20), the guide ring connecting section (21) and the guide body connecting section (22) is H, the minimum range of H is (R1-r), and the maximum range of H is equal to R2; the width of the straight section (20) along the axial direction of the guide body (11) is W1, the range of W1 is 0.01 times to 1 times L2; ​​the width of the straight section (20) along the radial direction of the guide body (11) is W2, the range of W2 is 0.01 times to 1 times L2; ​​the radius of the semi-circular section (23) is R Z1 The length L of the square portion is 0.5 times that of W2. Z1 Subtract R from W1 Z1 and the tail length, the tail length being the control point P on the Bézier curve trajectory of the outer contour of the tail (24). Z1 The vertical distance to its connection with the square structure and the P Z2 The sum of the vertical distances to the connection point of the straight section (20) and the square structure; the vertical distance of the straight section (20) along the axial direction of the guide body (11) and from the guide body (11) is C1, the range of C1 is 0.01 times to 1 times of H; the vertical distance of the straight section (20) along the radial direction of the guide body (11) and from the guide body (11) is C2, the range of C2 is 0.01 times to 1 times of H; the length of the straight section (20) along the axial direction of the guide body (11) is h1, the range of h1 is 0.0001 times to 1 times of H; the radial length of the straight section (20) along the guide body (11) is h2, the range of h2 is 0.0001 times to 1 times of H, used to improve aerodynamic efficiency.

9. The high-efficiency pneumatic support plate according to claim 8, characterized in that: The angle formed by the connection between the flow guide body connecting part (22) and the flow guide body (11) along its axial direction and near the flow guide outlet (13) is a1, and the angle range of a1 is 0-180°; the angle formed by the connection between the flow guide ring connecting part (21) and the flow guide ring (10) along the axial direction of the flow guide body (11) and near the flow guide outlet (13) is a2, and the angle range of a2 is 0-180°; the angle formed by the connection between the flow guide body connecting part (22) and the flow guide body (11) along its radial direction is a3, and the angle range of a3 is 0-180°; the angle formed by the connection between the flow guide ring connecting part (21) and the flow guide ring (10) along the radial direction of the flow guide body (11) is a4, and the angle range of a4 is 0-180°, which is used to improve aerodynamic efficiency.

10. A diffuser, comprising the flow guide ring (10) and the flow guide body (11) coaxially arranged, characterized in that, The flow guide ring (10) and the flow guide body (11) are connected by the straight section (20), the flow guide ring connecting section (21) and the flow guide body connecting section (22) as described in any one of claims 1-9, thereby reducing the incoming flow resistance.

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