Volute assembly, blower and method of manufacturing a blower

Abstract

This invention discloses a volute assembly, a blower, and a method for manufacturing the blower, belonging to the field of non-variable displacement pump technology. The volute assembly includes a volute body, an end cap body, and a guide tube. The volute body has an air outlet. The end cap body includes a connecting cover and a guide shell. The connecting cover is connected to the front end of the volute body and together with the volute body forms a diffuser channel, which communicates with the air outlet. The guide shell extends in the front-rear direction, with its rear end connected to the connecting cover and its front end having an air inlet. The guide tube is connected inside the guide shell, and its outer wall surface and the inner wall surface of the guide shell together form an acceleration channel. The front end of the acceleration channel communicates with the air inlet, and its rear end communicates with the diffuser channel. This invention optimizes the fluid guiding structure of the blower and improves the overall energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of non-variable displacement pump technology, and in particular to volute assembly, blower, and method of manufacturing blower. Background Technology

[0002] High-speed centrifugal blowers are widely used in wastewater treatment, pneumatic conveying, and industrial ventilation. In related technologies, the blower drives the airflow to change from axial intake to radial entry into the impeller, and then into the volute from the impeller outlet. Traditional high-speed blowers have room for improvement in terms of structural design and fluid dynamics efficiency. Due to poor flow channel design, losses such as impact and separation often occur during gas flow, which restricts the improvement of overall machine energy efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a volute assembly, a blower, and a method for manufacturing the blower.

[0004] The solution to the technical problem of this invention is:

[0005] Firstly, a volute assembly is proposed, comprising:

[0006] The main body of the volute is equipped with an air outlet;

[0007] The end cap body includes a connecting cap and a drain shell. The connecting cap is connected to the front end of the volute body and together with the volute body forms a diffuser channel. The diffuser channel is connected to the air outlet. The drain shell extends in the front-rear direction. The rear end of the drain shell is connected to the connecting cap. The front end of the drain shell is provided with an air inlet.

[0008] A guide fluid is connected inside the flow-guiding shell. The outer wall surface of the guide fluid and the inner wall surface of the flow-guiding shell together form an acceleration channel. The front end of the acceleration channel is connected to the air inlet, and the rear end of the acceleration channel is connected to the diffuser channel.

[0009] The present invention has at least the following beneficial effects: gas enters the acceleration channel from the inlet, accelerates and turns along the acceleration channel, enters the diffuser channel, converges the airflow and converts kinetic energy into static pressure energy through the diffuser channel, and finally flows out through the outlet. In this process, due to the acceleration channel, the airflow can complete a 90-degree turn and acceleration from axial to radial, reducing inlet impact loss.

[0010] As a further improvement to the above technical solution, the front end of the guide fluid is a hemispherical structure, and the rear end of the guide fluid is a tapered structure with the radius of the tapered structure gradually decreasing from front to back. The front end of the tapered structure and the rear end of the hemispherical structure are smoothly connected. The drainage shell includes a bulging section and a recessed section. The rear end of the bulging section and the front end of the recessed section are smoothly connected. The hemispherical structure is positioned corresponding to the bulging section, and the tapered structure is positioned corresponding to the front end of the recessed section. The rear end of the recessed section is connected to the connecting cover. The cross-section of the acceleration channel formed by the guide fluid and the drainage shell is S-shaped.

[0011] As a further improvement to the above technical solution, the cross-sectional shape of the diffuser channel is D-shaped, and the cross-sectional area of ​​the diffuser channel gradually increases from the starting end to the outlet.

[0012] As a further improvement to the above technical solution, the connecting cover and the drainage shell are integrally formed.

[0013] Secondly, a blower is proposed, comprising an impeller assembly and a volute assembly as described in any of the above technical solutions. The impeller assembly includes an impeller body and a drive component. The impeller body is disposed between the volute body and the guide fluid. The drive component is installed on the rear side of the volute body. The output shaft of the drive component passes through the outer wall surface of the volute body and is drivenly connected to the impeller body.

[0014] As a further improvement to the above technical solution, the impeller body includes a chassis, main blades, and sub-blades. The chassis has a forward-protruding truncated cone in the middle. Multiple main blades and sub-blades are provided. The main blades and sub-blades are arranged at intervals on the outer periphery of the truncated cone. Each main blade bends and extends from the front end of the truncated cone to the edge of the chassis. Each sub-blade bends and extends from the middle of the truncated cone to the edge of the chassis. An impeller flow channel is formed between adjacent main blades and sub-blades.

[0015] As a further improvement to the above technical solution, the blower also includes multiple rear guide vanes, which are connected to the connecting cover and arranged around the central circumference of the connecting cover. A rectifier flow channel is formed between two adjacent rear guide vanes, and the rectifier flow channel is connected to the impeller flow channel and the diffuser flow channel respectively.

[0016] As a further improvement to the above technical solution, the rear guide vane includes a guide vane and a connecting shaft. The guide vane is connected to one end of the connecting shaft, and the other end of the connecting shaft is rotatably connected to the connecting cover.

[0017] As a further improvement to the above technical solution, a fitting gap is formed between the front edge of the impeller body and the inner wall surface of the guide shell, and the width of the fitting gap is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0018] Thirdly, a method for manufacturing a blower is proposed, for manufacturing a blower as described in any of the above technical solutions, the method comprising the following steps:

[0019] The shape parameters of the volute body, end cover body, guide tube, and impeller body are determined based on the installation site space, required air volume, and air pressure.

[0020] The volute body, the end cap body, the fluid guide, the impeller body, and the drive component are respectively prepared.

[0021] Assemble the volute body, the impeller body, and the end cover body. After adjusting the fit clearance between the impeller body and the end cover body, assemble the drive component.

[0022] Additional aspects and advantages of this application will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the blower according to an embodiment of the present invention;

[0025] Figure 2 This is an exploded structural diagram of the blower according to an embodiment of the present invention, omitting the drive component;

[0026] Figure 3 This is a schematic diagram of the structure of the volute body according to an embodiment of the present invention;

[0027] Figure 4 yes Figure 1 A magnified structural diagram of part A in the middle;

[0028] Figure 5 yes Figure 3 A magnified structural diagram of part B in the middle section;

[0029] Figure 6 This is a schematic diagram of the impeller body according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the airflow channel according to an embodiment of the present invention;

[0031] Figure 8 This is a flowchart of a method for manufacturing a blower according to an embodiment of the present invention.

[0032] Reference numerals: 100, volute body; 110, diffuser channel; 120, outlet; 200, end cap body; 210, acceleration channel; 220, connecting cover; 230, guide shell; 240, fitting clearance; 300, guide fluid; 400, impeller body; 410, main blade; 420, sub-blades; 430, impeller channel; 440, chassis; 500, drive component; 600, rear guide vane. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limiting this invention.

[0035] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0037] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. The various technical features of the present invention can be combined interactively without contradicting each other.

[0038] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 In the first aspect, the present invention provides a volute assembly that can be applied to a blower. As a fluid guiding structure of the blower, the volute assembly can reduce energy loss caused by airflow impact and separation, and effectively improve the overall energy efficiency of the machine.

[0039] The volute assembly includes a volute body 100, an end cap body 200, and a guide fluid 300. The volute body 100 has an air outlet 120. The end cap body 200 includes a connecting cap 220 and a guide shell 230. The connecting cap 220 is connected to the front end of the volute body 100 and together with the volute body 100 forms a diffuser channel 110, which communicates with the air outlet 120. The guide shell 230 extends in the front-rear direction, with its rear end connected to the connecting cap 220 and its front end having an air inlet. The guide fluid 300 is connected inside the guide shell 230. The outer wall surface of the guide fluid 300 and the inner wall surface of the guide shell 230 together form an acceleration channel 210. The front end of the acceleration channel 210 communicates with the air inlet, and the rear end of the acceleration channel 210 communicates with the diffuser channel 110.

[0040] In operation, gas enters the acceleration channel 210 from the inlet, accelerates and turns along the acceleration channel 210, and enters the diffuser channel 110. The diffuser channel 110 converges the airflow and converts kinetic energy into static pressure energy, and the gas finally flows out through the outlet 120. During this process, due to the acceleration channel 210, the airflow can complete a 90-degree turn and acceleration from axial to radial, reducing inlet impact loss.

[0041] It is understandable that the guide fluid 300 can guide the flow direction of the airflow, guiding the airflow to accelerate and turn in the direction of minimum energy loss. During production, the flow channel 210 can be accelerated by computational fluid dynamics (CFD) simulation, and the outer wall of the guide fluid 300 can be designed according to the preset gas flow path so that the prepared volute assembly can guide the fluid 300 to flow along the preset path.

[0042] In some embodiments, the front end of the guide fluid 300 is a forward-protruding hemispherical structure, and the rear end of the guide fluid 300 is a tapered structure with its radius gradually decreasing from front to back. The front end of the tapered structure and the rear end of the hemispherical structure are smoothly connected, forming a bulb-shaped guide fluid 300. The drainage shell 230 includes a bulging section and a recessed section. The rear end of the bulging section and the front end of the recessed section are smoothly connected. The bulging section and the hemispherical structure are positioned correspondingly, and the front end of the recessed section and the tapered structure are positioned correspondingly. The rear end of the recessed section is connected to the connecting cover 220. The acceleration channel 210 formed by the guide fluid 300 and the drainage shell 230 has an S-shaped cross-section.

[0043] The resulting acceleration channel 210, with its shape based on the "brachistochrone curve" principle of a cycloid, is designed as an S-shape through CFD simulation. This allows it to guide the airflow to accelerate and change direction with minimal energy loss. The acceleration channel 210 is not arbitrarily curved; rather, it is designed according to the "brachistochrone curve" (cycloid curve) principle in cycloid theory, treating the gas as a small particle and the theoretical pressure rise of the fan as "gravitational acceleration," with the optimal shape determined through aerodynamic calculations. Compared to traditional inlet channels, this design enables the airflow particles to complete a 90-degree turn and acceleration from axial to radial direction in the shortest time and with minimal resistance, minimizing inlet impact loss.

[0044] In some embodiments, the outer side of the drainage shell 230 is connected to the connecting cover 220 via a support frame.

[0045] In some embodiments, the diffuser channel 110 has a D-shaped cross-section, and the cross-sectional area of ​​the diffuser channel 110 gradually increases from the starting end to the outlet 120. It is understood that the D-shaped cross-section is perpendicular to the gas flow direction, wherein, referring to... Figure 3 and Figure 5 The outer peripheral wall of the volute body 100 forms an arc edge of a D-shaped cross section, while the connecting cover 220 forms a straight edge of a D-shaped cross section. The rear end of the straight edge of the D-shaped cross section has a gap that connects the diffuser channel 110 and the acceleration channel 210. This gap is formed by the distance between the rear end of the connecting cover 220 and the wall of the volute body 100.

[0046] Understandably, the cross-sectional shape of the diffuser 110 smoothly transitions from a small-area D-shape at the beginning to a large-area D-shape at the outlet 120 along the airflow direction. This diffuser 110 with a gradually expanding cross-sectional area can efficiently convert the high-speed kinetic energy of the gas into static pressure energy and gather the gas with minimal eddy current loss, and the gas is finally discharged through the outlet 120.

[0047] In some embodiments, the connecting cap 220 and the drain shell 230 are integrally formed. Specifically, the end cap body 200 is integrally formed by a casting process, ensuring structural strength and the smoothness of the flow channel surface.

[0048] In some embodiments, the volute body 100 is also integrally formed by a casting process to ensure its structural strength and the smoothness of the flow channel surface.

[0049] In some embodiments, the rear side of the volute body 100 is configured as a plane for installation. During installation, the volute assembly can be rotated 360 degrees about the central axis of the fluid guide 300, so that the direction of the air outlet 120 can be adjusted according to the site space and actual pipeline layout, which greatly improves the adaptability and installation efficiency of the product.

[0050] Reference Figures 1 to 7 Secondly, embodiments of the present invention provide a blower comprising an impeller assembly and a volute assembly as described in any embodiment of the first aspect, which can effectively improve energy efficiency. The impeller assembly includes an impeller body 400 and a drive component 500. The impeller body 400 is disposed between the volute body 100 and the guide fluid 300. The drive component 500 is mounted on the rear side of the volute body 100, and its output shaft passes through the outer wall of the volute body 100 and is drivenly connected to the impeller body 400.

[0051] The drive unit 500 drives the impeller to rotate, which enables the gas to enter the volute assembly through the inlet. The airflow is accelerated and turned along the acceleration channel 210 with minimal energy loss. After passing the impeller, the airflow enters the diffuser channel 110 and flows along the diffuser channel 110 to the outlet 120.

[0052] In some embodiments, refer to Figure 6 The impeller body 400 includes a chassis 440, main blades 410 and sub-blades 420. A forward-protruding truncated cone is provided in the middle of the chassis 440. Multiple main blades 410 and sub-blades 420 are provided. The main blades 410 and sub-blades 420 are arranged at intervals on the outer periphery of the truncated cone. Each main blade 410 bends and extends from the front end of the truncated cone to the edge of the chassis 440. Each sub-blade 420 bends and extends from the middle of the truncated cone to the edge of the chassis 440. An impeller flow channel 430 is formed between adjacent main blades 410 and sub-blades 420.

[0053] The impeller body 400 is a three-dimensional flow impeller. After the airflow enters the impeller body 400, it flows in the impeller flow channel 430 formed by the main blades 410 and the branch blades 420. The impeller flow channel 430 is S-shaped on the meridional plane, which enables the airflow to be smoothly accelerated and pressurized in the centrifugal force field. Specifically, after the airflow enters the impeller body 400, it flows radially in the impeller flow channel 430 formed by the main blades 410 and the branch blades 420. Since this flow path is also designed to be S-shaped, it is beneficial to efficiently do work on the gas under the action of centrifugal force.

[0054] In some embodiments, refer to Figure 1 and Figure 7 The blower also includes multiple rear guide vanes 600, which are connected to the connecting cover 220 and arranged around the central circumference of the connecting cover 220. A rectifier flow channel is formed between two adjacent rear guide vanes 600. One end of the rectifier flow channel is connected to the impeller flow channel 430, and the other end is connected to the diffuser flow channel 110.

[0055] Specifically, the rectifying channel forms an S-shaped airflow channel with an impeller channel 430 located on the impeller body 400. It can be understood that as the impeller body 400 rotates, the impeller channel 430 corresponding to each rectifying channel changes with the rotation of the impeller body 400. The gas flowing out of the impeller channel 430 is initially conditioned by the rear guide vane 600 and further guided by it. Part of the gas's kinetic energy is converted into static pressure energy, and the airflow direction is corrected, allowing the airflow to enter the diffuser channel 110 more smoothly. The rear guide vane 600 guides and diffuses the high-speed airflow ejected from the impeller body 400, reducing the circumferential component of the airflow's absolute velocity and pre-organizing the flow field for efficient operation in the diffuser channel 110. It can be understood that in the above process, the formed S-shaped airflow channel not only serves as a guide but also further pressurizes the gas, recovers some kinetic energy, and improves the overall efficiency of the fan.

[0056] In some embodiments, the rear guide vane 600 includes a guide vane and a connecting shaft. One end of the guide vane is connected to the connecting shaft, and the other end of the connecting shaft is rotatably connected to the connecting cover 220. This configuration allows operators to easily adjust the angle of the guide vane according to actual conditions to achieve effective rectification and improve the overall efficiency of the machine at multiple operating points.

[0057] In some embodiments, the guide vanes are fusiform. This arrangement further reduces airflow impact losses.

[0058] In some embodiments, refer to Figure 4 A fitting gap 240 is formed between the leading edge of the impeller body 400 and the inner wall of the guide shell 230. The width of the fitting gap 240 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. This fitting gap 240 within this width range can ensure the smooth rotation of the impeller body 400 while forming a precise air seal between the impeller body 400 and the guide shell 230, effectively preventing the leakage of gas from the high-pressure area to the low-pressure intake area, reducing internal airflow leakage, and thus improving the overall efficiency of the blower.

[0059] The width of the clearance 240 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.3mm.

[0060] The airflow, guided by the guide vanes 600, enters the diffuser channel 110. Driven by the rotating impeller body 400, the airflow gradually converges towards the outlet 120 along the diffuser channel 110. The diffuser channel 110 has a D-shaped cross-section, smoothly transitioning from a small-area D-shape to a large-area D-shape. This gradual transition effectively converts the kinetic energy of the gas into static pressure energy and smoothly pushes the gas out of the fan with low loss. The D-shaped structure is conducive to achieving uniformity and high efficiency in this process.

[0061] Since the blower uses the volute assembly proposed in any embodiment of the first aspect, the blower also has all the beneficial effects brought about by the aforementioned volute assembly, which will not be elaborated here.

[0062] Thirdly, embodiments of the present invention provide a method for manufacturing a blower, which is used to manufacture a blower as described in any embodiment of the second aspect, referring to... Figure 8 The method for manufacturing a blower includes steps S101, S102 and S103.

[0063] Step S101: Based on the installation site space, required air volume, and air pressure, calculate and determine the shape parameters of the volute body 100, end cover body 200, guide tube 300, and impeller body 400. Specifically, the curved surfaces of the guide shell 230 and the guide tube 300 are optimized through CFD analysis to match the intake flow angle, and an S-shaped acceleration channel 210 is designed based on the fastest curve principle. The specific shape of the acceleration channel 210 is determined by the cycloidal equation through CFD aerodynamic optimization.

[0064] In step S102, the volute body 100, end cap body 200, fluid guide 300, impeller body 400, and drive component 500 are prepared respectively. Specifically, the volute body 100 is integrally formed by casting, and the end cap body 200 is also integrally formed by casting, which can ensure the structural strength of the volute body 100 and the end cap body 200 and the smoothness of the formed flow channel surface.

[0065] In some embodiments, a rear guide vane 600 also needs to be prepared to facilitate the formation of a flow channel at the outlet end of the impeller body 400.

[0066] Step S103: Assemble the volute body 100, impeller body 400 and end cover body 200. After adjusting the fitting clearance 240 between the impeller body 400 and the end cover body 200, assemble the drive component 500.

[0067] In some embodiments, the width of the fitting gap 240 between the impeller body 400 and the end cover body 200 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm, which enables the impeller body 400 and the guide shell 230 to form a precise air seal fit, effectively preventing the leakage of gas from the high-pressure area to the low-pressure intake area, reducing internal leakage of airflow, and thus improving the overall efficiency of the blower.

[0068] In some embodiments, a rear guide vane 600 also needs to be assembled. The rear guide vane 600 has a simple structure and is directly installed on the connecting cover 220 without the need for a complex support structure. After removing the connecting cover 220 and the volute body 100, the rear guide vane 600 can be directly exposed, facilitating processing and maintenance. In some embodiments, the guide vanes of the rear guide vane 600 are rotatably connected to the connecting cover 220 via a connecting shaft. During assembly, the angle of the guide vanes is adjusted according to the flow rate requirements. It can be understood that if the blower needs to operate in a low flow rate range, the angle of the guide vanes is adjusted to reduce the opening of the rear guide vane 600; if the blower needs to operate in a high flow rate range, the angle of the guide vanes is adjusted to increase the opening of the rear guide vane 600.

[0069] Furthermore, the volute body 100 and the drive component 500 are connected by a flange. The volute assembly can be rotated 360 degrees around the output shaft of the drive component 500, allowing the direction of the air outlet 120 of the volute body 100 to be adjusted arbitrarily according to the site space and pipeline layout, greatly improving the product's adaptability and installation efficiency.

[0070] Understandably, the blower manufactured using this method is based on a four-stage coordinated design: an S-shaped acceleration channel 210 (based on the "fastest curve"), an S-shaped impeller channel 430, an S-shaped airflow channel formed by the rear guide vane 600, and a gradually expanding D-shaped diffuser channel 110. This design achieves a smooth, low-loss, and efficient conversion of airflow from intake to exhaust, and allows for flexible installation. It significantly improves the blower's aerodynamic efficiency and operational stability, while reducing energy consumption and noise.

[0071] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A volute assembly, characterized by, include: The main body of the volute is equipped with an air outlet; The end cap body includes a connecting cap and a drain shell. The connecting cap is connected to the front end of the volute body and together with the volute body forms a diffuser channel. The diffuser channel is connected to the air outlet. The drain shell extends in the front-rear direction. The rear end of the drain shell is connected to the connecting cap. The front end of the drain shell is provided with an air inlet. A guide fluid is connected inside the flow-guiding shell. The outer wall surface of the guide fluid and the inner wall surface of the flow-guiding shell together form an acceleration channel. The front end of the acceleration channel is connected to the air inlet, and the rear end of the acceleration channel is connected to the diffuser channel. The front end of the guide fluid is a hemispherical structure, and the rear end of the guide fluid is a tapered structure with the radius gradually decreasing from front to back. The front end of the tapered structure and the rear end of the hemispherical structure are smoothly connected. The guide shell includes a bulging section and a recessed section. The rear end of the bulging section and the front end of the recessed section are smoothly connected. The hemispherical structure is positioned corresponding to the bulging section, and the tapered structure is positioned corresponding to the front end of the recessed section. The rear end of the recessed section is connected to the connecting cover. The cross-section of the acceleration channel formed by the guide fluid and the guide shell is S-shaped. The cross-sectional shape of the diffuser channel is D-shaped, and the cross-sectional area of ​​the diffuser channel gradually increases from the starting end to the outlet.

2. The volute assembly of claim 1, wherein, The connecting cover and the drainage shell are integrally formed.

3. A blower, characterized by The device includes an impeller assembly and a volute assembly as described in any one of claims 1 to 2. The impeller assembly includes an impeller body and a drive component. The impeller body is disposed between the volute body and the guide fluid. The drive component is mounted on the rear side of the volute body. The output shaft of the drive component passes through the outer wall surface of the volute body and is drivenly connected to the impeller body.

4. The air blower of claim 3, wherein The impeller body includes a chassis, main blades, and sub-blades. The chassis has a forward-protruding truncated cone in the middle. Multiple main blades and sub-blades are provided, and the main blades and sub-blades are arranged at intervals on the outer periphery of the truncated cone. Each main blade bends and extends from the front end of the truncated cone to the edge of the chassis, and each sub-blade bends and extends from the middle of the truncated cone to the edge of the chassis. An impeller flow channel is formed between adjacent main blades and sub-blades.

5. The blower according to claim 4, characterized in that, The blower also includes multiple rear guide vanes, which are connected to the connecting cover and arranged around the central circumference of the connecting cover. A rectifier flow channel is formed between two adjacent rear guide vanes, and the rectifier flow channel is connected to the impeller flow channel and the diffuser flow channel respectively.

6. The air blower of claim 5, wherein The rear guide vane includes a guide vane and a connecting shaft. The guide vane is connected to one end of the connecting shaft, and the other end of the connecting shaft is rotatably connected to the connecting cover.

7. The blower according to claim 4, characterized in that, A fitting gap is formed between the front edge of the impeller body and the inner wall of the flow guide shell, and the width of the fitting gap is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

8. A method of manufacturing a blower, characterized by, A method for manufacturing a blower as described in any one of claims 3 to 7, the method comprising the following steps: The shape parameters of the volute body, end cover body, guide tube, and impeller body are determined based on the installation site space, required air volume, and air pressure. The volute body, the end cap body, the fluid guide, the impeller body, and the drive component are respectively prepared. Assemble the volute body, the impeller body, and the end cover body. After adjusting the fit clearance between the impeller body and the end cover body, assemble the drive component.

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