Improved efficiency three-dimensional flow high pressure fan

Abstract

An improved and more efficient three-dimensional flow high-pressure fan has a hub (4) with a wheel disk (6) fixed to the outer edge of the rear side. The hub (4) extends forward along the axial direction. Main blades (7) are fixed radially and evenly around the front side of the wheel disk (6), and thrust blades (8) are fixed radially and evenly around the rear side of the wheel disk (6). The main blades (7) are three-dimensional twisted three-dimensional flow blades, and the thrust blades (8) are straight blades. A small-volume three-dimensional flow impeller design is adopted to fully adapt to the flow characteristics of the gas in the impeller, reduce flow losses, and achieve a larger gas flow and pressure per unit volume by increasing the rotational speed. Static pressure growth is stable, and the fan operates with low noise. It can also control the velocity distribution of all fluid particles inside, obtain the best flow state inside the impeller, and enhance the stable operation capability of the product in an environment of -30℃ to 50℃. The fan diameter can be reduced by 5%, significantly reducing the weight of the equipment. The energy efficiency is significant, with energy saving effect reaching 80%. Maintenance is convenient, and damaged parts can be quickly replaced, reducing maintenance costs.

Description

Technical Field

[0001] This utility model belongs to the technical field of centrifugal fans and blade structures for centrifugal or spiral centrifugal pumps (IPC classification F04D29 / 00), and particularly relates to an improvement technology for high-pressure fan equipment based on a three-dimensional flow impeller structure. Background Technology

[0002] High-speed centrifugal fan impellers generate high-frequency noise at high speeds, severely polluting the environment. Existing technologies employ various methods to reduce impeller operating noise, such as modifying impeller structural features and designing pump mounting structures. Reducing the noise of high-speed centrifugal fans during operation remains a focus of ongoing research and development by our technical personnel.

[0003] Existing fans can be used for environmental dust removal, combustion in heating furnaces, air circulation, cleaning, filtration and other applications, and have a wide range of application value. However, commonly used fans use binary forward impellers, which generally have the characteristics of large flow separation, low efficiency and high noise. Working in this environment for a long time can cause hearing damage.

[0004] Three-dimensional flow high-pressure fans are advanced ventilation equipment designed based on three-dimensional flow theory. Their core lies in the use of multi-curved blade structures, which make the flow channel more adaptable to the actual flow state of the fluid. The streamlined design reduces wind resistance, resulting in a lightweight structure while ensuring sufficient structural strength. Optimizing the spatial curvature of the blades through computational fluid dynamics (CFD) analysis significantly improves the fan's efficiency, reliability, and safety.

[0005] Patent application 202323429502.X describes a three-dimensional flow fan impeller and a three-dimensional flow high-efficiency low-noise fan. The impeller includes a front disc, a rear disc, and several blades. The blades are evenly distributed circumferentially between the front and rear discs. The blades are three-dimensional twisted blades, and the upper edge of the blades is connected to the front disc.

[0006] Additionally, a high-pressure centrifugal fan with a three-dimensional impeller (CN119664692A) features a compact three-dimensional impeller design. A coupling-driven bidirectional inlet three-dimensional inlet fan (CN119664692A) increases airflow through its bidirectional inlet structure. An insertion-type high-temperature fan for heating furnaces (CN222391583U) improves insulation and sealing performance.

[0007] While existing three-dimensional flow fan impeller designs can reduce flow separation, they cannot completely eliminate it. Furthermore, current high-pressure fans suffer from insufficient control precision, slow response times, and difficulty in achieving accurate airflow regulation. They also exhibit poor environmental adaptability, with conventional fans showing unstable performance in extreme temperatures ranging from -30℃ to 50℃. Their aerodynamic efficiency is low, static pressure is insufficient, and airflow separation losses are significant. Finally, they are generally bulky, large in size, and heavy. Utility Model Content

[0008] This invention designs an improved and more efficient three-dimensional flow high-pressure fan that avoids flow separation and solves the problems of low energy efficiency, large weight, high noise, and low fan efficiency of traditional high-pressure fans.

[0009] Therefore, this utility model provides an improved and more efficient three-dimensional flow high-pressure fan, comprising a volute, an air inlet, an air outlet, a hub, a impeller, main blades, and thrust blades. The volute is disc-shaped, with a partial air outlet on its outer wall and an air inlet located at the axial center of the front side of the volute. The outer edge of the volute has an involute structure, and an impeller is coaxially mounted in the middle of the volute. The impeller includes a hub and a impeller coaxially mounted, with the impeller fixed to the rear outer edge of the hub. The hub extends axially forward, and the main blades are radially and evenly fixed in a circumferential pattern on the front side (front) of the impeller. Thrust blades are radially and evenly fixed in a circumferential pattern on the rear side (back) of the impeller. The main blades are three-dimensionally twisted three-dimensional flow blades, and the thrust blades are straight blades.

[0010] The impeller is an integrally formed structure of hub, disc, main blades and thrust blades, or the impeller is a combination structure of hub, disc, main blades and thrust blades.

[0011] The number of main blades is greater than the number of thrust blades. Furthermore, the number of main blades is odd, the number of thrust blades is even, and the thrust blades are arranged alternately with the main blades. The number of thrust blades is between 1 / 2 and 2 / 3 of the number of main blades. The length of the thrust blades is less than 1 / 2 of the wheel disk radius.

[0012] The front and rear edges of the main blades are curved to form a plane perpendicular to the impeller's central axis. At the same time, the overall impeller outline is circumscribed by a trapezoidal frustum, meaning the outer diameter of the impeller's front end is smaller than the outer diameter of the rear end, i.e., the outer diameter of the impeller disk. The front and outer edges of the main blades are curved and tilted towards the edge of the impeller disk.

[0013] Furthermore, to achieve the above objectives, this utility model is configured as follows:

[0014] In particular, the hub 4 extends forward along the axial direction with a thickness greater than three times that of the wheel disc.

[0015] In particular, the area between the front side of the rotor and the two adjacent main blades forms a wind channel. The wind channel has a curved and gradually widening structure from the axis outwards, and the curvature of the wind channel is opposite to the airflow direction at the outlet. The difference between the two pitches (chord lengths) at the outlet ends of any three adjacent main blades is less than 2.6 mm.

[0016] In particular, a circular pressure plate is fixed to the front end face of the impeller.

[0017] In particular, a conical or disc-shaped wheel cover is fixedly installed on the front side of the impeller, i.e., the leading edge of the main blades.

[0018] In particular, a cylindrical air collector is installed at the air inlet. The inner diameter of the front end of the air collector is larger than that of the middle and rear sections; a bearing ring is installed on the inner edge of the rear end of the air collector, and the inner edge of the bearing ring is engaged with the outer edge of the front end of the impeller.

[0019] In particular, the rear center of the hub 4 has an axle hole, and the rear side of the volute housing, i.e. the center of the back, has a hole to connect to the axle hole.

[0020] Compared with existing technologies, the beneficial effects of this invention are: It adopts a small-volume three-dimensional flow impeller design to fully adapt to the flow characteristics of gas within the impeller, reducing flow losses and achieving greater gas flow rate and pressure per unit volume by increasing the rotational speed. It enhances the product's stable operation capability in environments ranging from -30℃ to 50℃. The structure is lightweight; under the same performance conditions, the fan diameter can be reduced by 5%, significantly reducing equipment weight. Energy efficiency is significant, with energy savings reaching up to 80%. Maintenance is convenient, facilitating quick replacement of damaged parts and reducing maintenance costs. Attached Figure Description

[0021] The following figures are illustrative and should not be construed as limiting the scope of this invention. Referring to the figures helps the reader understand the embodiments of this invention and further appreciate its advantages and technical features.

[0022] Figure 1 This is a schematic diagram of the main structure of Example 1.

[0023] Figure 2 This is a side view of the structure of Example 1.

[0024] Figure 3 This is a schematic diagram of the impeller structure in Example 1.

[0025] Figure 4 This is a schematic diagram of the main view structure of Example 2.

[0026] Figure 5 This is a side view structural diagram of Example 2.

[0027] The reference numerals in the figures include:

[0028] 1-Vortex casing, 2-Air inlet, 3-Air outlet, 4-Hub, 5-Air collector, 6-Disc, 7-Main blade, 8-Thrust blade, 9-Bearing ring, 10-Air groove, 11-Shaft hole, 12-Pressure plate, 13-Wheel cover, 14-Dynamic balance spare hole. Detailed Implementation

[0029] It should be noted that:

[0030] In the description of this utility model, unless otherwise expressly specified and limited, the terms "comprising" and "having," and any variations thereof, are intended to cover other possible options under the same logic not listed. For example, a process, method, system, product, or device comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device. The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the utility model product is in use. They are only for the convenience of describing the utility model 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 of the utility model. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal," "vertical," and "suspended" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. The terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components.

[0031] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In case of any conflict, the definitions in this specification shall prevail.

[0032] Three-dimensional flow design technology, based on the "three-dimensional flow theory," infinitely divides the three-dimensional space inside the impeller. By analyzing each working point within the impeller flow channel, a complete and realistic mathematical model of the fluid flow inside the impeller is established, followed by mesh generation and flow field calculation. The three-dimensional flow design method optimizes factors such as the blade inlet / outlet angle, the number of blades, and the cross-sectional shape of the twisted blades. Its structure can adapt to the actual flow state of the fluid, thereby avoiding flow separation at the blade working surface, reducing flow losses, and controlling the velocity distribution of all fluid particles inside, achieving the optimal flow state inside the pump body and ensuring optimal fluid delivery efficiency.

[0033] By designing the inlet and outlet angles of the blades on the front and rear discs, flow separation is eliminated at the suction surface inlet on the front disc side of the impeller, and the flow conditions on the front disc side are improved. Boundary layer separation is suppressed, and boundary layer separation and vortex flow field in the blade passages are improved, ultimately ensuring optimal fluid transport efficiency. The impeller outlet velocity direction and magnitude, the static pressure distribution in the blade passages are more uniform, the entropy increase at the blade passage outlet is smaller, the static pressure increase is stable, and the fan operating noise is low. Flow separation on the blade working surface is avoided, flow losses are reduced, and the velocity distribution of all internal fluid particles can be controlled, achieving the optimal flow state inside the impeller, and the flow separation problem is essentially eliminated.

[0034] The principle of this invention is to develop a high-pressure ventilation fan by improving the design of the three-dimensional flow blades and impeller, as well as the structure of the matching volute and air collector, thereby improving the efficiency of the whole machine. Tests have shown that the three-dimensional flow high-pressure centrifugal fan has the characteristics of large flow rate and pressure, low noise, and stable mechanical performance.

[0035] This invention introduces a newly developed high-efficiency, energy-saving three-dimensional flow impeller. The blades are three-dimensionally twisted, conforming to gas flow laws, causing airflow to turn and split. No obvious vortex phenomena were observed within the entire impeller flow channel. This achieves an impeller efficiency of 84%-92%, an improvement of 8-15 percentage points compared to conventional products. This technology has been applied in rail transportation, industrial kilns, environmental protection equipment, and other fields, achieving an 8% increase in energy efficiency and a 5-decibel reduction in noise in some applications.

[0036] This utility model includes: a volute 1, an air inlet 2, an air outlet 3, a hub 4, a disc 6, main blades 7, and thrust blades 8. The volute 1 is disc-shaped, with a partial air outlet 3 on its outer wall, and an air inlet 2 located at the axial center of the front side of the volute 1. The outer edge of the volute 1 has an involute structure, and an impeller is coaxially mounted in the middle of the inner part of the volute 1. The impeller includes a hub 4 and a disc 6 coaxially mounted. The disc 6 is fixed to the rear outer edge of the hub 4, and the hub 4 extends forward along the axial direction. The main blades 7 are radially and evenly fixed in a circumferential pattern on the front side (front) of the disc 6, and the thrust blades 8 are radially and evenly fixed in a circumferential pattern on the rear side (back) of the disc 6. The main blades 7 are three-dimensional twisted three-dimensional flow blades, and the thrust blades 8 are straight blades.

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the impeller is an integrally formed structure consisting of hub 4, disc 6, main blade 7, and thrust blade 8, and is manufactured by a five-axis machining center.

[0039] In the aforementioned case, the number of main blades (7) is greater than the number of thrust blades (8). Furthermore, the number of main blades (7) is odd, the number of thrust blades (8) is even, and the thrust blades (8) are arranged alternately with the main blades (7). The number of thrust blades (8) is between 1 / 2 and 2 / 3 of the number of main blades (7).

[0040] As mentioned above, the thickness of the wheel hub 4 extending forward along the axial direction is more than three times the thickness of the wheel disc 6.

[0041] As described above, the area between the front side of the wheel 6 and the two adjacent main blades 7 forms the air trough 10. The air trough 10 has a curved and gradually widening structure from the axis outward, and the curvature direction of the air trough 10 is opposite to the airflow direction of the outlet 3. In particular, the difference between the two pitches (i.e., chord lengths) at the outlet ends of any three adjacent main blades 7 is <2.6 mm.

[0042] As mentioned above, a circular pressure plate 12 is fixed to the front end face of the impeller.

[0043] As described above, a conical or disc-shaped wheel cover 13 is fixedly installed on the front side of the impeller, i.e., the leading edge of the main blade 7. In this case, the front side of the air duct 10 is closed.

[0044] As mentioned above, a cylindrical air collector 5 is installed on the air inlet 2. The inner diameter of the front end of the air collector 5 is larger than that of the middle and rear sections. Furthermore, at the same time, a bearing ring 9 is installed on the inner edge of the rear end of the air collector 5, and the inner edge of the bearing ring 9 is engaged with the outer edge of the front end of the impeller.

[0045] As mentioned above, a shaft hole 11 is opened in the middle of the rear end of the hub 4. Correspondingly, a hole is opened in the middle of the rear side of the volute 1 to connect with the shaft hole 11.

[0046] In the aforementioned context, the length of the thrust blade 8 is less than half the radius of the wheel disk 6.

[0047] In this embodiment of the present invention, in particular, the front edge and rear edge of the main blade 7 are curved to form a plane perpendicular to the central axis of the impeller. At the same time, the overall impeller outline is circumscribed with a trapezoidal frustum, that is, the outer diameter of the front end of the impeller is smaller than the outer diameter of the rear end, i.e., the outer diameter of the wheel disk 6. The front end of the main blade 7 is curved to the outer edge and tilts towards the edge of the wheel disk 6.

[0048] In this embodiment, preferably, a total of 15 main blades 7 are evenly distributed on the front side of the wheel disk 6, and a total of 8 thrust blades 8 are evenly distributed on the back side of the wheel disk 6.

[0049] In this embodiment of the invention, the impeller disk 6 has a diameter of 1200mm and a rotational speed of 2980rpm. To improve impeller strength and ensure safe operation of the fan, the impeller is made of high-strength titanium alloy. The wheel cover 13 and main blades 7 are formed by hot pressing using a mold. In particular, the integrated impeller structure is completed by automated programming of a five-axis machining center to ensure machining accuracy. Thrust blades 8 are welded to the back of the disk 6, which reduces the axial thrust of the impeller rotor structure shaft hole 11, protects the shaft hole 11 of the hub 4 and the bearing structure of the bearing ring 9, and strengthens the impeller. Aerodynamic efficiency is improved by 8-15 percentage points, equipment weight is reduced by more than 5%, and energy saving effect can reach 80%.

[0050] In this embodiment of the invention, the thrust blade 8 is mainly used to withstand and balance the axial thrust generated during the operation of the fan. Its core functions include:

[0051] Axial force balance: When the impeller rotates, axial thrust is generated due to hydrodynamic effects. The thrust blades are specially designed to convert these axial forces into radial forces to prevent the impeller from axial displacement.

[0052] Bearing protection: By effectively distributing the axial load, the axial pressure on the bearing is significantly reduced, thus extending the bearing's service life.

[0053] Improved operational stability: Ensures the impeller maintains a stable position during high-speed rotation, avoiding vibration and efficiency reduction caused by axial displacement.

[0054] The working mechanism of the thruster blades is based on the synergistic effect of fluid mechanics and mechanical mechanics:

[0055] Force conversion principle: When airflow passes through the impeller, the thrust blades, with their specific airfoil design and installation angle, decompose the axial thrust into a radial component that can be absorbed by the casing.

[0056] Dynamic balancing: During the operation of the wind turbine, the thrust blades continuously adjust their stress state to balance the axial force caused by changes in rotational speed or load fluctuations in real time.

[0057] Integration with bearing systems: In high-end equipment such as air-suspended blowers, thrust blades and air-suspended bearings work together to achieve contactless operation, greatly reducing energy loss.

[0058] In this embodiment of the invention, during impeller balancing, the impeller disk 6 employs a weight reduction mode. Balance blocks are added to the pre-set dynamic balancing spare holes 14 on the edge of the impeller disk 6 according to the side view adjustment. Simultaneously, balance blocks can also be added to the impeller cover 13. The impeller should undergo static and dynamic balancing tests respectively, with an accuracy of grade 2.5, and double-sided calibration. The maximum rotor speed is 2980 rpm. The allowable remaining unbalanced weight should not exceed 2g.

[0059] The implementation principle of this embodiment is as follows: external airflow enters the volute 1 through the air inlet 2, and is cut and dispersed by the main blades 7 from the front end face or the inner side of the front end of the impeller and enters the air grooves 10 between each main blade 7; during the high-speed rotation of the impeller, the airflow avoids flow separation, reduces flow loss, maintains stable acceleration control of the velocity distribution of all fluid particles inside the air grooves 10 of the impeller, obtains the best flow state inside the fan, and ensures that the efficiency of fluid transportation reaches the best.

[0060] Example 2: As shown in the attached document Figure 4 , 5 As shown, the impeller is a combination structure of hub 4, disc 6, main blade 7 and thrust blade 8, which is made by welding.

[0061] In this embodiment of the invention, the main blades 7 must be weighed before being joined, and blades of similar weight are arranged symmetrically. The welding process for the main blades 7 is required to follow the Q690 welding process. After welding the main blades 7 onto the impeller disk 6, the impeller blank is further formed by fixing the impeller cover 13 to the top surface of the main blades 7. After annealing, the thrust blades 8 are welded to the back of the impeller disk 6. Then, the impeller cover 13 and the impeller disk 6 are precision machined. The welds of the main blades 7 and the thrust blades should be inspected for flaws. The weld surface must be free of cracks, slag inclusions, porosity, incomplete fusion, and weld beads.

[0062] In this embodiment of the utility model, the manufacturing tolerance dimensional requirements are as specified in JB / T10214-2014 "Technical Conditions for Welded Parts of Ventilation Fans".

[0063] In this embodiment of the invention, the impeller with the welded structure has low manufacturing efficiency and is constrained by the welding process, which affects the overall structural accuracy of the impeller product.

[0064] Example 3, Typical application case of thrust blade 8:

[0065] In the embodiments of this utility model;

[0066] Preferably, in general industrial fan applications, fiberglass thrust blades are used because they are low in cost and corrosion resistant.

[0067] Preferably, in the application of precision air suspension blowers, the thrust blades 8 made of AL7075 aviation aluminum have good processing performance and resistance to deformation. When combined with air suspension bearings, they achieve a power transmission efficiency of 97% and a service life of more than 30 years.

[0068] Preferably, in mine ventilation system applications, thrust blades with high-chromium cast iron and tungsten carbide coating (8HRC60+) are used due to their high hardness and wear resistance, making them suitable for high-dust, high-wear environments with a dust concentration of 200mg / m³. 3 Under certain environmental conditions, the annual wear is only 0.1 mm.

[0069] Preferably, in large wind power generation equipment, the thrust blades made of carbon fiber composite materials are lightweight, high-strength, and fatigue-resistant, enabling ultra-large wind turbines to withstand extreme wind loads while maintaining a lightweight design.

[0070] Preferably, in the application of ventilation fans in tunnel construction: the specially designed thrust blades 8, combined with the sealing system, maintain long-term stable operation under blasting vibration environment.

[0071] Based on the embodiments of this utility model described above, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this utility model.

Claims

1. An improved and more efficient three-dimensional flow high-pressure fan, comprising a volute (1), an air inlet (2), an air outlet (3), a hub (4), a disc (6), main blades (7), and thrust blades (8); characterized in that, The volute (1) is disc-shaped, with a local air outlet (3) on the outer wall and an air inlet (2) at the center of the front side of the volute (1). The outer edge of the volute (1) has an involute structure. An impeller is coaxially mounted in the middle of the volute (1). The impeller includes a hub (4) and a disc (6) coaxially mounted. The disc (6) is fixed on the rear outer edge of the hub (4). The hub (4) extends forward along the axial direction. The main blade (7) is radially and uniformly fixed on the front side of the disc (6) in a radial pattern. The thrust blade (8) is radially and uniformly fixed on the rear side of the disc (6). The main blade (7) is a three-dimensional twisted three-dimensional flow blade, and the thrust blade (8) is a straight blade.

2. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, The impeller is an integrally formed structure of hub (4), disc (6), main blade (7) and thrust blade (8), or the impeller is a combination structure of hub (4), disc (6), main blade (7) and thrust blade (8).

3. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, The number of main blades (7) is greater than the number of thrust blades (8); the number of main blades (7) is odd and the number of thrust blades (8) is even. Moreover, the thrust blades (8) and the main blades (7) are arranged in an alternating manner, and the number of thrust blades (8) is between 1 / 2 and 2 / 3 of the number of main blades (7); the length of the thrust blades (8) is less than 1 / 2 of the radius of the wheel (6).

4. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, The front and rear edges of the main blade (7) are curved to form a plane perpendicular to the impeller's central axis; the overall impeller outline is circumscribed with a trapezoidal frustum, that is, the outer diameter of the front end of the impeller is smaller than the outer diameter of the rear end, i.e., the outer diameter of the impeller disk (6), and the front end of the main blade (7) is curved to the outer edge and tilts towards the edge of the impeller disk (6).

5. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, The hub (4) extends forward along the axial direction and its thickness is more than three times the thickness of the disc (6).

6. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, The area between the front side of the wheel (6) and the two adjacent main blades (7) forms a wind trough (10). The wind trough (10) has a curved and gradually widening structure from the axis outward, and the curvature of the wind trough (10) is opposite to the airflow direction of the air outlet (3). The difference between the two pitches, i.e. the chord lengths, at the outlet ends of any three adjacent main blades (7) is <2.6mm.

7. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, A circular pressure plate (12) is fixed to the front end face of the impeller.

8. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, A conical or disc-shaped wheel cover (13) is fixedly installed on the front side of the impeller, i.e., the front edge of the main blade (7).

9. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, A cylindrical air collector (5) is installed on the air inlet (2); the inner diameter of the front port of the air collector (5) is larger than that of the middle and rear sections; a bearing ring (9) is installed on the inner edge of the rear port of the air collector (5), and the inner edge of the bearing ring (9) is engaged with the outer edge of the front end of the impeller.

10. The improved and more efficient three-dimensional flow high-pressure fan according to claim 1, characterized in that, The hub (4) has a shaft hole (11) in the middle of its rear end, and the volute (1) has a hole in the middle of its rear side to connect to the shaft hole (11).

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