Integrated centrifugal fan of high-air-pressure manifold expansion channel

Abstract

The invention provides an integrated centrifugal fan with a high-air-pressure manifold expansion channel. The integrated centrifugal fan comprises an air inlet flow guide structure, a front-section flow guide structure, a centrifugal impeller, an impeller driving assembly and a rear-section flow guide structure. The front-section flow guide structure comprises a flow guide shell, the flow guide shell is provided with a straight-barrel-shaped airflow inlet channel and a bowl-shaped expansion structure, and the transition connecting structure and a base body of the centrifugal impeller form a first bent flow channel. The rear-section flow guide structure comprises an outer expansion shell, a guide blade grid and an inner expansion shell, the outer expansion shell is a thin-wall shell with taper, the inner expansion shell is of a straight cylindrical structure with one closed end, the closed end of the inner expansion shell is arranged beyond the edge of the outer expansion shell, and the expansion structure, the outer expansion shell and the inner expansion shell form a second bent flow channel. Compared with a centrifugal fan with a volute, the centrifugal fan has the advantage of eliminating volute tongues and other high-frequency noise sources, and compared with a traditional centrifugal fan without a volute, the centrifugal fan has the advantages of being compact in structure and high in efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifuges, and particularly to an integrated centrifugal fan with a high-wind-pressure manifold expansion channel. Background Art

[0002] As a key fluid machine, a centrifugal fan converts the kinetic energy of gas into static pressure potential energy through the rotation of an impeller, and is widely used in the fields of ventilation, cooling, and gas transportation. The traditional volute structure uses a gradually expanding flow channel to collect the radial air flow and turn it into an axial output. Although it can achieve static pressure recovery, there are two major defects: First, flow separation and secondary recirculation are likely to occur in the volute tongue area, resulting in significant turbulent dissipation and generating additional vibration noise; Second, the spiral structure of the volute leads to redundant volume and weight, restricting high-speed and lightweight applications. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide an integrated centrifugal fan with a high-wind-pressure manifold expansion channel to eliminate or improve one or more defects existing in the prior art.

[0004] The present invention provides an integrated centrifugal fan with a high-wind-pressure manifold expansion channel, including an air inlet guiding structure, a front-section guiding structure, a centrifugal impeller, an impeller driving component, and a rear-section guiding structure;

[0005] The air inlet guiding structure is fixedly arranged on the air inlet side of the front-section guiding structure;

[0006] The front-section guiding structure includes a guiding housing, the guiding housing is a thin-walled housing, the guiding housing has a straight cylindrical air inlet channel and a bowl-shaped expansion structure, and the joint part of the air inlet channel and the expansion structure has a rounded transition connection structure, and the transition connection structure and the base of the centrifugal impeller form a first turning flow channel;

[0007] The centrifugal impeller and the impeller driving component are installed between the front-section guiding structure and the rear-section guiding structure, and the impeller driving component is used to drive the centrifugal impeller to rotate;

[0008] The rear-section guiding structure includes an outer expansion housing, a guide vane cascade, and an inner expansion housing. The inner expansion housing is arranged inside the outer expansion housing, and both ends of the guide vane cascade are fixedly connected to the inner wall of the outer expansion housing and the inner wall of the inner expansion housing respectively; the outer expansion housing is a thin-walled housing with a taper, the inner expansion housing is a straight cylindrical structure with one end closed, and the closed end of the inner expansion housing extends beyond the edge of the outer expansion housing, and the expansion structure, the outer expansion housing, and the inner expansion housing form a second turning flow channel.

[0009] In one embodiment, the closed end of the inner expansion housing is an arc-shaped transition structure.

[0010] In one embodiment, the intake air guiding structure includes a guiding cover, which is a hemispherical shell structure. The spherical end of the guiding cover faces the intake side of the centrifugal fan, and the spherical end of the guiding cover is flush with the intake side of the guiding shell; the guiding cover is fixedly connected to the guiding shell.

[0011] In one embodiment, the front-section guiding structure further includes a motor support seat and a connecting bracket. The motor support seat is coaxially arranged with the guiding shell. Two ends of the connecting bracket are respectively fixedly connected to the motor support seat and the guiding shell. The motor support seat is used for installing the impeller driving assembly.

[0012] In one embodiment, the outer side wall of the motor support seat is an arc structure and is in a smoothly transitional connection form with the outer side wall of the guiding cover.

[0013] In one embodiment, the impeller driving assembly includes an outer-rotor motor; both ends of the outer-rotor motor respectively have fixed shafts, and the two fixed shafts are respectively fixedly connected to the middle of the motor support seat and the closed end of the inner expansion shell; the outer-rotor motor is coaxially arranged with the centrifugal impeller, and the centrifugal impeller is installed on the outer side of the outer-rotor motor.

[0014] In one embodiment, the impeller driving assembly further includes a connecting piece and a key; the middle of the connecting piece is fixedly connected to the end of the outer-rotor motor, and the edge of the connecting piece is fixedly connected to the end of the centrifugal impeller; a keyway is provided on the inner wall of the mounting hole of the centrifugal impeller, and the key is fixedly arranged on the outer wall of the outer-rotor motor, and the key is matched with the keyway.

[0015] In one embodiment, the fixed shaft has a limiting flat surface portion, and the limiting flat surface portion is used for cooperating with the motor support seat and the closed end of the inner expansion shell.

[0016] In one embodiment, the closed end of the inner expansion shell has a relief groove, and the relief groove is adapted to the edge of the base body of the centrifugal impeller.

[0017] In one embodiment, flanges are provided on the intake side of the guiding shell, the connecting portion between the guiding shell and the outer expansion shell, and the exhaust side of the outer expansion shell and the inner expansion shell.

[0018] An integrated centrifugal fan with a high-wind-pressure manifold expansion channel in an embodiment of the present invention has the following technical effects: By changing the structure of the original centrifugal fan, the volute is cancelled, which shortens the radial length of the fan, reduces the weight, and adapts to a compact and high-speed rotor system. At the same time, it meets the requirements of axial air intake, single-stage high pressure ratio, and axial air outlet. Through the collaborative optimization of the cascade blades and the casing profile, the active diversion of the high-speed air flow at the impeller outlet and the efficient conversion of kinetic energy are realized. Compared with the centrifugal fan with a volute, it has the advantage of eliminating high-frequency noise sources such as volute tongues. Compared with the traditional volute-less centrifugal fan, it has the advantages of compact structure and high efficiency.

[0019] Additional advantages, objects, and features of the present invention will be partly set forth in the description which follows, and in part will become obvious to those having ordinary skill in the art upon examination of the following, or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification and the drawings.

[0020] Those skilled in the art will understand that the objects and advantages that can be achieved by the present invention are not limited to the above specifically described, and the above and other objects that the present invention can achieve will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are for further understanding of the present invention, form a part of this application, and do not limit the present invention. The components in the drawings are not drawn to scale, but are only for showing the principles of the present invention. For the convenience of showing and describing some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, may become larger relative to other components in the exemplary device actually manufactured according to the present invention.

[0022] Figure 1 Schematic perspective view of an integrated centrifugal fan with a high-wind-pressure manifold expansion channel in an embodiment of the present invention.

[0023] Figure 2 Front view of an integrated centrifugal fan with a high-wind-pressure manifold expansion channel in an embodiment of the present invention.

[0024] Figure 3 Left view of an integrated centrifugal fan with a high-wind-pressure manifold expansion channel in an embodiment of the present invention.

[0025] Figure 4 In an embodiment of the present invention Figure 3 A - A cross-sectional view.

[0026] Figure 5 Right view of an integrated centrifugal fan with a high-wind-pressure manifold expansion channel in an embodiment of the present invention.

[0027] Figure 6 Schematic three-dimensional structure diagram of the front-stage flow guiding structure in an embodiment of the present invention.

[0028] Figure 7 Schematic three-dimensional structure diagram of the rear-stage flow guiding structure in an embodiment of the present invention.

[0029] Figure 8 Schematic three-dimensional structure diagram of the rear-stage flow guiding structure from another perspective in an embodiment of the present invention.

[0030] Figure 9 Schematic three-dimensional structure diagram of the centrifugal impeller in an embodiment of the present invention.

[0031] Figure 10 Schematic three-dimensional structure diagram of the impeller drive assembly in an embodiment of the present invention.

[0032] Figure 11 Matching schematic diagram of the guide vane cascade in an embodiment of the present invention.

[0033] Figure 12 Schematic diagram of the first bent flow channel and the second bent flow channel in an embodiment of the present invention.

[0034] Reference numerals: 1, front-stage flow guiding structure; 101, flow guiding housing; 102, connecting bracket; 103, motor support base; 2, centrifugal impeller; 3, flow guiding cover; 4, rear-stage flow guiding structure; 401, outer expansion housing; 402, guide vane cascade; 403, inner expansion housing; 5, impeller drive assembly; 501, outer rotor motor; 502, connecting piece; 503, key. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the implementation manners and the accompanying drawings. Herein, the illustrative implementation manners and descriptions of the present invention are used to explain the present invention, but do not limit the present invention.

[0036] Herein, it should also be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0037] It should be emphasized that the term "including / containing" when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0038] Herein, it should also be noted that if not otherwise specified, the term "connection" in this article can not only refer to direct connection, but also represent indirect connection with an intermediate.

[0039] In the following, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0040] In an existing centrifugal fan, the air flow driven by the centrifugal impeller radially enters the air inlet channel and axially enters the air outlet cylinder through the air outlet channel under the guidance of the guide vanes and the inner wall of the conical cylinder arc surface, and then is discharged. However, the guide vanes only guide the deflection of the air flow, and fail to convert the kinetic energy during deflection into static pressure potential energy to maximize the efficiency. Moreover, there is still a mismatch between the inlet air flow angle of the separated guide vanes and the actual air flow angle. The fluid forms random flow tubes in the casing and flows downstream. On the one hand, the air flow pattern changes greatly, resulting in increased losses. On the other hand, the oscillating flow tubes induce the cavity effect of the casing, causing additional vibration and noise. To solve the above problems, an integrated centrifugal fan with a high wind pressure flow pattern expansion channel is provided in the embodiments of the present invention.

[0041] Referring to Figures 1 to 10 , an integrated centrifugal fan with a high wind pressure flow pattern expansion channel is provided in the embodiments of the present invention, including an air inlet guide structure, a front section guide structure 1, a centrifugal impeller 2, an impeller drive assembly 5, and a rear section guide structure 4; the air inlet guide structure is fixedly arranged on the air inlet side of the front section guide structure 1; the front section guide structure 1 includes a guide housing 101, the guide housing 101 is a thin-walled housing, the guide housing 101 has a straight cylindrical air inlet channel and a bowl-shaped expansion structure, and the joint part of the air inlet channel and the expansion structure has a rounded transition connection structure, and the transition connection structure forms a first bent flow channel with the base of the centrifugal impeller 2; the centrifugal impeller 2 and the impeller drive assembly 5 are installed between the front section guide structure 1 and the rear section guide structure 4, and the impeller drive assembly 5 is used to drive the centrifugal impeller 2 to rotate; the rear section guide structure 4 includes an outer expansion housing 401, a guide vane cascade 402, and an inner expansion housing 403, the inner expansion housing 403 is arranged inside the outer expansion housing 401, and both ends of the guide vane cascade 402 are fixedly connected to the inner wall of the outer expansion housing 401 and the inner wall of the inner expansion housing 403 respectively; the outer expansion housing 401 is a thin-walled housing with a taper, the inner expansion housing 403 is a straight cylindrical structure with one end closed, and the closed end of the inner expansion housing 403 extends beyond the edge of the outer expansion housing 401, and the expansion structure, the outer expansion housing 401, and the inner expansion housing 403 form a second bent flow channel.

[0042] It should be noted that referring to Figure 11, the installation angle of the guide vane cascade 402 and the deflection angle of the blades are both determined by the outlet circulation of the fan blades of the centrifugal impeller 2 in front. The axial chord length b of the guide vane cascade 402 and the pitch t of the guide vane cascade 402 are determined by the vane pitch τ = b / t. Active elimination of the circumferential velocity component (circulation): Based on the airflow angle at the outlet of the centrifugal impeller 2, an array of guide vane cascades 402 is designed in the axial outlet section. The inlet airflow angle of the guide vanes is adapted according to the airflow angle at the radial outlet of the centrifugal impeller, realizing the transformation of the airflow from a flow with a circumferential component velocity to an axial flow, thereby actively eliminating the circumferential velocity component (circulation). The guide vane cascade 402 and the casing diffuser flow passage are integrated into a continuous and smooth composite surface. The root of the vane cascade blade and the casing wall surface adopt conformal transition to avoid the interface flow separation of the traditional split structure; at the same time, the cross-section of the casing flow passage is in an expanding streamline shape along the axial direction, synchronously realizing the low-turbulence conversion of kinetic energy into static pressure potential energy.

[0043] In the above embodiments, the thin-wall design of the guide shell, the outer expansion shell and the inner expansion shell not only ensures light weight, but also enhances the overall strength and stability through reasonable structural layout, enabling the fan to still operate stably in a high-wind-pressure environment. The centrifugal impeller 2 ensures that the airflow can pass through smoothly and drives the centrifugal impeller to rotate, realizing efficient energy conversion. Refer to Figure 12 , the inner walls of the first bend flow passage and the second bend flow passage are integrally designed with a manifold. The first bend flow passage and the second bend flow passage not only contribute to the further expansion and deceleration of the airflow, but also can effectively reduce the airflow noise and improve the sound insulation performance of the fan. The setting of the guide vane cascade further optimizes the flow state of the airflow during the expansion process, reducing vortex and turbulence phenomena, thereby improving the overall performance and stability of the fan. All the structures are compactly integrated together, not only reducing the overall volume of the fan, but also simplifying the installation and maintenance process.

[0044] It should be noted that this embodiment proposes an integrated centrifugal fan with a high-wind-pressure manifold expansion channel. Through the integrated guide flow channel design of aeronautical-grade guide vane cascades and manifold expansion casings for aerodynamic-structural coupling, it breaks through the limitations of the traditional separated design of the diffuser section and the guide structure. Abandon the traditional volute structure and eliminate high-frequency noise sources such as volute tongues. This technical solution realizes the active diversion and efficient conversion of kinetic energy of the high-speed airflow at the impeller outlet through the coordinated optimization of the vane cascade blades and the casing profile, fundamentally suppressing the airflow deflection and separation phenomena, and at the same time having the advantages of compact structure and high efficiency.

[0045] The working principle of the above embodiments is as follows: After the air flow is accelerated by passing through the centrifugal impeller 2 through axial intake, it is deflected through the first bent flow path in sequence, bending the air flow from axial flow to radial flow, and then passing through the guide vane cascade 402 to rectify and eliminate the circumferential component and centrifugal eddy current of the air flow; at the same time, the deceleration and pressurization of the air flow are completed in the first bent flow path and the second bent flow path, and an axial air flow with a high pressure ratio is output.

[0046] This embodiment changes the original centrifugal fan structure, cancels the volute, shortens the radial length of the fan, reduces the weight, and adapts to a compact and high-speed rotor system; at the same time, it meets the requirements of axial intake, single-stage high pressure ratio, and axial exhaust. Through the collaborative optimization of the vane cascade blades and the casing profile, the active diversion and efficient kinetic energy conversion of the high-speed air flow at the impeller outlet are realized. Compared with the centrifugal fan with a volute, it has the advantage of eliminating high-frequency noise sources such as volute tongues, and compared with the traditional volute-less centrifugal fan, it has the advantages of compact structure and high efficiency.

[0047] In some embodiments, the closed end of the inner expansion housing 403 is an arc transition structure. The arc transition structure can more smoothly guide the air flow from the inner expansion housing into the subsequent flow path, avoiding air flow separation and eddy current phenomena caused by right angles or sharp edges, thereby reducing the energy loss of the air flow during the expansion process. The arc transition structure can reduce the impact and collision of the air flow during the expansion process, thereby reducing the noise and vibration levels during the operation of the fan. This is of great significance for improving the sound insulation performance and stability of the fan.

[0048] In some embodiments, the intake air guiding structure includes a guiding cover 3. The guiding cover 3 is a hemispherical shell structure. The spherical end of the guiding cover 3 faces the intake side of the centrifugal fan, and the spherical end of the guiding cover 3 is flush with the intake side of the guiding housing 101; the guiding cover 3 is fixedly connected to the guiding housing 101. The guiding cover 3 can play a role in guiding the air flow entering from the middle of the front to the surrounding to enter the centrifugal fan impeller. The hemispherical design of the guiding cover 3 can more effectively capture and guide the surrounding air flow into the centrifugal fan. Its spherical end faces the intake side and is flush with the intake side of the guiding housing 101, ensuring that the air flow can enter the guiding housing smoothly and smoothly, reducing air flow disorder and energy loss, thereby improving the intake efficiency. The guiding cover 3 is fixedly connected to the guiding housing 101 to form a solid overall structure. This design not only enhances the strength and stability of the intake air guiding structure, but also helps to reduce the vibration and noise generated by air flow impact.

[0049] In some embodiments, the front-section guiding structure 1 further includes a motor support base 103 and a connecting bracket 102. The motor support base 103 is coaxially arranged with the guiding housing 101. The two ends of the connecting bracket 102 are respectively fixedly connected to the motor support base 103 and the guiding housing 101. The motor support base 103 is used to install the impeller drive assembly 5.

[0050] In some embodiments, the outer sidewall of the motor support base 103 is an arc-shaped structure and is smoothly connected to the outer sidewall of the flow guide cover 3. This reduces the obstruction and turbulence of the air flow when passing through this area, helps to maintain the smoothness and stability of the air flow, and improves the overall performance of the fan.

[0051] In some embodiments, the impeller drive assembly 5 includes an outer rotor motor 501; both ends of the outer rotor motor 501 are respectively provided with fixed shafts, and the two fixed shafts are respectively fixedly connected to the middle part of the motor support base 103 and the closed end of the inner expansion housing 403; the outer rotor motor 501 is coaxially arranged with the centrifugal impeller 2, and the centrifugal impeller 2 is installed on the outer side of the outer rotor motor 501. The outer rotor motor 501 is used to drive the centrifugal impeller 2 to rotate.

[0052] In some embodiments, the impeller drive assembly 5 further includes a connecting piece 502 and a key 503; the middle part of the connecting piece 502 is fixedly connected to the end of the outer rotor motor 501, and the edge part of the connecting piece 502 is fixedly connected to the end of the centrifugal impeller 2; the inner wall of the mounting hole of the centrifugal impeller 2 has a keyway, and the key 503 is fixedly arranged on the outer wall of the outer rotor motor 501, and the key 503 is matched with the keyway.

[0053] In some embodiments, the fixed shaft has a limiting flat surface portion, and the limiting flat surface portion is used to cooperate with the motor support base 103 and the closed end of the inner expansion housing 403.

[0054] In some embodiments, the closed end of the inner expansion housing 403 has a relief groove, and the relief groove is adapted to the edge of the base of the centrifugal impeller 2. The design of the relief groove enables the closed end of the inner expansion housing 403 to closely fit the edge of the base of the centrifugal impeller without causing interference. Such a setting optimizes the spatial layout inside the fan, makes the overall structure more compact, and helps to reduce the volume and weight of the fan.

[0055] In some embodiments, flanges are provided on the air inlet side of the flow guide housing 101, the connection part between the flow guide housing 101 and the outer expansion housing 401, and the air exhaust side of the outer expansion housing 401 and the inner expansion housing 403, which facilitates the connection between components.

[0056] It should be clear that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, the detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present invention.

[0057] In the present invention, features described and / or illustrated for one embodiment can be used in the same way or in a similar way in one or more other embodiments, and / or combined with the features of other embodiments or replace the features of other embodiments.

[0058] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated centrifugal fan with a high-pressure manifold expansion channel, characterized in that: It comprises an air intake guide structure, a front section guide structure (1), a centrifugal impeller (2), an impeller drive assembly (5) and a rear section guide structure (4); The air intake guide structure is fixedly arranged on the air intake side of the front section guide structure (1); The front section flow guide structure (1) comprises a flow guide housing (101), the flow guide housing (101) being a thin-walled housing, the flow guide housing (101) having a straight cylindrical airflow inlet channel and a bowl-shaped expansion structure, the junction between the airflow inlet channel and the expansion structure having a rounded transition connection structure, the transition connection structure and the base of the centrifugal impeller (2) forming a first curved flow channel; The centrifugal impeller (2) and the impeller driving assembly (5) are installed between the front section flow guiding structure (1) and the rear section flow guiding structure (4), and the impeller driving assembly (5) is used to drive the centrifugal impeller (2) to rotate; The rear section flow guide structure (4) comprises an outer expansion shell (401), a guide vane grid (402), and an inner expansion shell (403); the inner expansion shell (403) is arranged on the inner side of the outer expansion shell (401); two ends of the guide vane grid (402) are respectively fixedly connected to the inner wall of the outer expansion shell (401) and the inner wall of the inner expansion shell (403); the outer expansion shell (401) is a tapered thin-walled shell; the inner expansion shell (403) is a straight cylindrical structure with one end closed; the closed end of the inner expansion shell (403) is arranged beyond the edge of the outer expansion shell (401); the expansion structure, the outer expansion shell (401) and the inner expansion shell (403) form a second curved flow channel.

2. The integrated centrifugal fan with high wind pressure manifold expansion channel according to claim 1 is characterized in that: The closed end of the inner expansion shell (403) is an arc-shaped transition structure.

3. The integrated centrifugal fan with high wind pressure flow expansion channel according to claim 1, characterized in that: The air intake guide structure comprises a guide cover (3), the guide cover (3) being a hemispherical shell structure, the spherical end of the guide cover (3) facing the air intake side of the centrifugal fan, the spherical end of the guide cover (3) being flush with the air intake side of the guide shell (101); the guide cover (3) is fixedly connected to the guide shell (101).

4. The integrated centrifugal fan with high wind pressure flow expansion channel according to claim 3 is characterized in that: The front section flow guide structure (1) further comprises a motor support seat (103) and a connecting bracket (102); the motor support seat (103) is coaxially arranged with the flow guide housing (101); two ends of the connecting bracket (102) are respectively fixedly connected to the motor support seat (103) and the flow guide housing (101); the motor support seat (103) is used for installing the impeller drive assembly (5).

5. The integrated centrifugal fan with high wind pressure manifold expansion channel according to claim 4, characterized in that: The outer wall of the motor support seat (103) is an arc-shaped structure, and is connected to the outer wall of the air guide cover (3) in a smooth transition form.

6. The integrated centrifugal fan with high wind pressure flow expansion channel according to claim 4, characterized in that: The impeller drive assembly (5) comprises an outer rotor motor (501); the two ends of the outer rotor motor (501) are respectively provided with fixed shafts, and the two fixed shafts are respectively fixedly connected to the middle part of the motor support seat (103) and the closed end of the inner expansion shell (403); the outer rotor motor (501) is coaxially arranged with the centrifugal impeller (2), and the centrifugal impeller (2) is installed on the outside of the outer rotor motor (501).

7. The integrated centrifugal fan with high wind pressure flow expansion channel according to claim 6, characterized in that: The impeller drive assembly (5) further comprises a connecting piece (502) and a key (503); the middle portion of the connecting piece (502) is fixedly connected to the end of the outer rotor motor (501), and the edge of the connecting piece (502) is fixedly connected to the end of the centrifugal impeller (2); the inner wall of the mounting hole of the centrifugal impeller (2) has a keyway, and the key (503) is fixedly arranged on the outer wall of the outer rotor motor (501), and the key (503) matches the keyway.

8. The integrated centrifugal fan with high wind pressure flow expansion channel according to claim 6, characterized in that: The fixed shaft is provided with a limiting plane portion, and the limiting plane portion is used to cooperate with the motor support seat (103) and the closed end of the inner expansion shell (403).

9. The integrated centrifugal fan with high wind pressure flow expansion channel according to claim 1, characterized in that: The closed end of the inner expansion shell (403) has a clearance groove, and the clearance groove is adapted to the edge of the base of the centrifugal impeller (2).

10. The integrated centrifugal fan with high wind pressure manifold expansion channel according to claim 1, characterized in that: Flanges are provided on the air inlet side of the flow guide housing (101), the connection portion between the flow guide housing (101) and the outer expansion housing (401), and the exhaust sides of the outer expansion housing (401) and the inner expansion housing (403).

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