A centrifugal fan impeller with flow collection and stability enhancement

Abstract

The application discloses a centrifugal fan impeller with a flow collecting and stabilizing type, wherein a wheel cover comprises a wheel cover conical arc section, a wheel cover conical frustum section, a wheel cover pressure stabilizing section and a wheel cover outflow section which are sequentially connected; an injection ring is arranged in the flow collecting and stabilizing channel; the injection ring comprises an injection conical arc section and an injection pressure stabilizing section which are sequentially connected; a plurality of jet flow holes are uniformly arranged on the ring plate; the first flow channel and the second flow channel jointly form the flow collecting and stabilizing channel; and the injection ring is installed on one side of the flow collecting and stabilizing channel which is closer to the flow collector. The arc-shaped flared opening is arranged at the air inlet of the wheel cover, the air inlet area is increased, and the air volume is increased. The air guide ring is more closely matched, the fluid flow route is optimized, the loss in the fluid flow process is reduced, the fluid enters the impeller more smoothly, and the noise is reduced. The flared opening can also play a role of a reinforcing rib to increase the mechanical strength of the wheel cover, the size of the wheel cover is more stable during manufacturing, and the wheel cover is more stable during operation.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, specifically to a fan impeller, and more specifically to a flow-collecting and stabilizing centrifugal fan impeller. Background Technology

[0002] Fans are mainly used in ventilation-related industries: air compressors, air conditioners, heat pumps, ventilation in energy mines, underground projects, and underground power plants; ventilation and induced draft in boilers; exhaust of high-temperature corrosive gases in chemical plants; ventilation in workshop air conditioning and atomic protection equipment; negative pressure wards in medical facilities; shopping malls, airports, and other public places. Their applications are very wide, covering almost all sectors of the national economy, and they belong to the category of general machinery.

[0003] A fan is a machine that uses input electrical energy to increase gas pressure and discharge gas. Driven by a motor, the fan rotates, converting electrical energy into mechanical energy through the rotor's rotation, which in turn converts the mechanical energy into the kinetic energy of the gas, causing airflow. Once a certain flow rate or pressure is reached, it can meet the needs of various industries. It is a type of driven fluid machinery, mainly consisting of asynchronous AC fans or motors (AC series) and DC brushless permanent magnet synchronous variable frequency fans and motors (EC series).

[0004] When the fan is running, the motor drives the impeller to rotate. The rotation of the impeller centrifugally throws the fluid towards the outlet, creating a negative pressure inside the impeller chamber. The fluid, under atmospheric pressure, enters the impeller through the collector, thus delivering air. During normal operation, the impeller rotates while the collector remains stationary. During this process, a reasonable gap is maintained between the impeller cover inlet and the collector. However, air can still enter through this gap in actual use. Therefore, optimizing the design of this gap can significantly improve the overall impeller efficiency. This demonstrates the necessity of optimizing the gap design.

[0005] The prior art CN219242249U discloses a novel centrifugal fan impeller and fan, including a collector 1, a wheel cover 2, blades 3, a wheel disc 4, and a motor 5. The wheel disc 4 and the motor 5 are fixedly connected, and the blades 3 and the wheel disc 4 are fixedly connected. The blades 3 are provided with a blade tip 8 at the top. A part of the blade tip 8 is connected to the wheel cover 2, and the other part of the blade tip 8 is fitted with the collector 1 with a clearance or without clearance. The collector 1 adopts an outer sleeve or an inner sleeve. The function of the collector 1 realizes the transformation of airflow from axial to radial, making the fan structure more compact and reducing the impeller height. Due to the relatively large inlet diameter, the air volume is increased, the rotational speed is reduced, and the noise is reduced at the same air volume.

[0006] However, the above-mentioned gap structure has design limitations, only involving the design of some non-universal gap structures, with poor adaptability, large flow loss, poor performance under varying operating conditions, unstable air volume, high noise, low strength, and low efficiency. Therefore, in order to address these problems, the applicant proposes a flow-collecting and stabilizing centrifugal fan impeller to solve the above-mentioned problems, reduce noise, increase air volume, and thus improve efficiency and strength. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a flow-collecting and stabilizing centrifugal fan impeller to improve fan efficiency while meeting requirements for air volume, air pressure, and noise.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A centrifugal fan impeller with a flow-collecting and stabilizing design includes a disc, blades, a cover, and a collector. The cover is mounted on one side of the blades, and the disc is mounted on the other side. The collector is a hollow, conical-arc structure integrally machined, with its outlet end installed within the inlet channel of the cover. A flow-collecting and stabilizing channel is formed between the outer wall of the collector's outlet end and the inner wall of the cover's inlet end. The impeller is characterized by comprising a conical arc section, a frustum conical section, a pressure-stabilizing section, and an outlet section connected sequentially. An ejector ring is provided within the flow-collecting and stabilizing channel, comprising an ejector conical arc section and an ejector pressure-stabilizing section connected sequentially. The inner wall of the ejector ring is fixedly connected to the outer wall of the collector via a ring plate, and the outer wall of the ejector ring is fixedly connected to the outer wall of the collector via a fixed plate. The rib is fixedly connected to the inner wall of the wheel cover; multiple jet holes are evenly arranged on the ring plate; the wheel cover and the ejector ring enclose each other in the flow direction to form a first flow channel including a conical arc inlet flow channel, a conical truncated pressurizing flow channel, and a cylindrical stabilizing flow channel; the ejector ring and the collector enclose each other in the flow direction to form a second flow channel including an ejector conical arc flow channel and an ejector cylindrical stabilizing flow channel; the conical arc inlet flow channel, the conical truncated pressurizing flow channel, and the ejector conical arc flow channel are all flow channels with a reduced flow area in the flow direction; the cylindrical stabilizing flow channel and the ejector cylindrical stabilizing flow channel are both annular flow channels with a constant flow area in the flow direction; the first flow channel and the second flow channel together form a flow collection and expansion stabilizing flow channel; the ejector ring is installed in the flow collection and expansion stabilizing flow channel on the side closer to the collector.

[0010] Furthermore, the curvature of the ejector cone segment is greater than that of the wheel cover cone segment.

[0011] Furthermore, the angle between the truncated cone section of the wheel cover and the horizontal plane is an acute angle.

[0012] Furthermore, the cross-section of the jet orifice is circular, elliptical, or quadrilateral.

[0013] Furthermore, the perforation rate of the jet holes on the annular plate is 60-80%.

[0014] Furthermore, the height of the cylindrical pressure-stabilizing channel is H1, the height of the conical pressure-boosting channel is H2, and the height of the ejector cylindrical pressure-stabilizing channel is H3, where H3 = H1 + H2.

[0015] Furthermore, H1 ≥ H2.

[0016] Furthermore, the height of the blade is H, where H3 = (0.02~0.1)H.

[0017] Furthermore, the blades are twisted blades.

[0018] Furthermore, the axial width of the cylindrical pressure-stabilizing channel is W1, and the axial width of the ejector cylindrical pressure-stabilizing channel is W2, where W1 = (1.2~2.5)W2.

[0019] The present invention discloses a centrifugal fan impeller with a flow-collecting and stabilizing design. The impeller cover includes a conical arc section, a frustum-shaped section, a pressure-stabilizing section, and an outlet section connected in sequence. An ejector ring is disposed within the flow-collecting and stabilizing channel, the ejector ring including an ejector conical arc section and an ejector pressure-stabilizing section connected in sequence. The inner wall of the ejector ring is fixedly connected to the outer wall of the collector via a ring plate, and the outer wall of the ejector ring is fixedly connected to the inner wall of the impeller cover via fixing ribs. Multiple jet holes are uniformly arranged on the ring plate. The impeller cover and the ejector ring enclose a flow channel including a conical arc inlet channel and a frustum-shaped section in the flow direction. The first flow channel consists of a pressurizing channel and a cylindrical pressure-stabilizing channel. The ejector ring and collector enclose the flow direction to form a second flow channel, including an ejector conical arc flow channel and an ejector cylindrical pressure-stabilizing flow channel. The conical arc inlet flow channel, the truncated cone pressurizing flow channel, and the ejector conical arc flow channel are all flow channels with a reduced flow area along the flow direction. The cylindrical pressure-stabilizing flow channel and the ejector cylindrical pressure-stabilizing flow channel are both annular flow channels with a constant flow area along the flow direction. The first and second flow channels together form a flow-collecting, expanding, and stabilizing channel. The ejector ring is installed in the flow-collecting, expanding, and stabilizing channel closer to the collector. An arc-shaped flare is added to the impeller cover inlet, increasing the inlet area and thus increasing the airflow. This allows for a closer fit with the guide ring, optimizing the fluid flow path, reducing fluid loss during flow, and ensuring smoother fluid entry into the impeller, while also reducing noise. The flare also acts as a reinforcing rib, increasing the mechanical strength of the impeller cover, making the dimensions of the impeller cover more stable during manufacturing, and ensuring more stable vibration during impeller operation. By improving the gap structure, the problems of poor adaptability, large flow loss, poor performance under varying operating conditions, unstable air volume, high noise, low strength, and low efficiency have been solved, and the efficiency of the fan has been improved while meeting the requirements of air volume, air pressure, and noise. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the clearance structure of a centrifugal fan impeller in the prior art (partial structure A, the clearance is not flared);

[0021] Figure 2A schematic diagram of the improved clearance structure of a centrifugal fan impeller (partial structure B, with an flared opening in the clearance);

[0022] Figure 3 Schematic diagram of further optimized structure for centrifugal fan impeller clearance. Figure 1 ;

[0023] Figure 4 Schematic diagram of further optimized structure for centrifugal fan impeller clearance. Figure 2 .

[0024] In the diagram: 1. Wheel disk; 2. Blade; 3. Wheel cover; 31. Wheel cover conical arc section; 32. Wheel cover frustum section; 33. Wheel cover pressure stabilizing section; 34. Wheel cover outlet section; 4. Collector; 5. Injector ring; 51. Injector conical arc section; 52. Injector pressure stabilizing section; 6. Ring plate; 7. Fixing rib; 8. Injection hole; 9. First flow channel; 91. Conical arc inlet flow channel; 92. Frustum pressurizing flow channel; 93. Cylindrical pressure stabilizing flow channel; 10. Second flow channel; 10. Injector conical arc flow channel; 101. Injector cylindrical pressure stabilizing flow channel; 102. Height H1 of cylindrical pressure stabilizing flow channel 93; Height H2 of frustum pressurizing flow channel 92; Height H3 of injector cylindrical pressure stabilizing flow channel 102; Height H of blade; Axial width W1 of cylindrical pressure stabilizing flow channel 93; Axial width W2 of injector cylindrical pressure stabilizing flow channel 102. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] like Figure 1-4As shown, a centrifugal fan impeller with a flow-collecting and stabilizing design includes a disc 1, blades 2, a cover 3, and a collector 4. The cover 3 is installed on one side of the blades 2, and the disc 1 is installed on the other side. The collector 4 is an integrally machined conical-arc hollow cylinder, with its outlet end installed within the inlet channel of the cover 3. A flow-collecting and stabilizing channel is formed between the outer wall of the outlet end of the collector 4 and the inner wall of the inlet end of the cover 3. The cover 3 comprises a conical arc section 31, a frustum conical section 32, a pressure-stabilizing section 33, and an outlet section 34 connected in sequence. An ejector ring 5 is provided within the flow-collecting and stabilizing channel, comprising an ejector conical arc section 51 and an ejector pressure-stabilizing section 52 connected in sequence. The inner wall of the ejector ring 5 is fixedly connected to the outer wall of the collector 4 via a ring plate 6, and the outer wall of the ejector ring 5 is fixedly connected to the outer wall of the collector 4 via a fixing rib 7. The inner wall of the wheel cover 3 is fixedly connected; multiple jet holes 8 are evenly arranged on the ring plate 6; the wheel cover 3 and the ejector ring 5 enclose each other in the flow direction to form a first flow channel 9 including a conical arc inlet flow channel 91, a conical pressurizing flow channel 92, and a cylindrical pressure stabilizing flow channel 93; the ejector ring 5 and the collector 4 enclose each other in the flow direction to form a second flow channel 10 including an ejector conical arc flow channel 101 and an ejector cylindrical pressure stabilizing flow channel 102; the conical arc inlet flow channel 91, the conical pressurizing flow channel 92, and the ejector conical arc flow channel 101 are all flow channels with reduced flow channel area in the flow direction; the cylindrical pressure stabilizing flow channel 93 and the ejector cylindrical pressure stabilizing flow channel 102 are all annular flow channels with unchanged flow channel area in the flow direction; the first flow channel 9 and the second flow channel 10 together form a flow collection and expansion stabilizing flow channel; the ejector ring 5 is installed in the flow collection and expansion stabilizing flow channel on the side closer to the collector 4.

[0028] When the fan is running, the motor drives the impeller to rotate. The rotation of the impeller centrifugally throws the fluid towards the outlet, creating a negative pressure inside the impeller chamber. The fluid, under atmospheric pressure, enters the impeller through the collector, achieving air delivery. During normal use, the impeller rotates while the collector remains stationary. During this process, a reasonable gap is maintained between the impeller cover inlet and the collector. In actual use, air also enters through this gap. Therefore, optimizing the design of this gap can significantly improve the overall impeller efficiency. The applicant has optimized the gap structure design. The impeller cover includes a conical arc section, a frustum conical section, a pressure stabilizing section, and an outlet section connected in sequence. An ejector ring is installed inside the flow-enlarging and stabilizing channel, which includes an ejector conical arc section and an ejector pressure stabilizing section connected in sequence. Multiple jet holes are evenly arranged on the ring plate. The first and second flow channels together form the flow-enlarging and stabilizing channel. The ejector ring is installed on the side of the flow-enlarging and stabilizing channel closer to the collector. An arc-shaped flare is added to the impeller cover inlet, increasing the inlet area and thus increasing the air volume. A closer fit with the air guide ring optimizes the fluid flow path, reduces fluid loss during flow, and ensures smoother fluid entry into the impeller, while also reducing noise. The flared opening also acts as a reinforcing rib, increasing the mechanical strength of the impeller cover, making the dimensions of the impeller cover more stable during manufacturing, and resulting in more stable vibration during impeller operation.

[0029] Furthermore, the curvature of the ejector cone segment 51 is greater than the curvature of the wheel cover cone segment 31.

[0030] Furthermore, the angle between the wheel cover cone section 32 and the horizontal plane is an acute angle.

[0031] The design of angle and curvature is conducive to better ejection of the flowing fluid. The size of ejection angle and curvature directly affects the flow efficiency. Appropriate ejection angle and curvature greatly reduce the possibility of surge noise.

[0032] Furthermore, the cross-section of the jet hole 8 is circular, elliptical, or quadrilateral.

[0033] Furthermore, the perforation rate of the jet orifice 8 on the annular plate 6 is 60-80%.

[0034] Furthermore, the height of the cylindrical pressure-stabilizing channel 93 is H1, the height of the conical pressure-boosting channel 92 is H2, and the height of the ejector cylindrical pressure-stabilizing channel 102 is H3, where H3 = H1 + H2.

[0035] Furthermore, H1 ≥ H2.

[0036] Furthermore, the height of blade 2 is H, where H3 = (0.02~0.1)H.

[0037] Furthermore, blade 2 is a twisted blade.

[0038] Furthermore, the axial width of the cylindrical pressure-stabilizing channel 93 is W1, and the axial width of the ejector cylindrical pressure-stabilizing channel 102 is W2, where W1 = (1.2~2.5)W2.

[0039] The size and structure of each part play a crucial role in improving the flow state, which can help reduce vibration and noise and stabilize the fluid flow state.

[0040] The present invention discloses a centrifugal fan impeller with a flow-collecting and stabilizing design. The impeller cover includes a conical arc section, a frustum-shaped section, a pressure-stabilizing section, and an outlet section connected in sequence. An ejector ring is disposed within the flow-collecting and stabilizing channel, the ejector ring including an ejector conical arc section and an ejector pressure-stabilizing section connected in sequence. The inner wall of the ejector ring is fixedly connected to the outer wall of the collector via a ring plate, and the outer wall of the ejector ring is fixedly connected to the inner wall of the impeller cover via fixing ribs. Multiple jet holes are uniformly arranged on the ring plate. The impeller cover and the ejector ring enclose a flow channel including a conical arc inlet channel and a frustum-shaped section in the flow direction. The first flow channel consists of a pressurizing channel and a cylindrical pressure-stabilizing channel. The ejector ring and collector enclose the flow direction to form a second flow channel, including an ejector conical arc flow channel and an ejector cylindrical pressure-stabilizing flow channel. The conical arc inlet flow channel, the truncated cone pressurizing flow channel, and the ejector conical arc flow channel are all flow channels with a reduced flow area along the flow direction. The cylindrical pressure-stabilizing flow channel and the ejector cylindrical pressure-stabilizing flow channel are both annular flow channels with a constant flow area along the flow direction. The first and second flow channels together form a flow-collecting, expanding, and stabilizing channel. The ejector ring is installed in the flow-collecting, expanding, and stabilizing channel closer to the collector. An arc-shaped flare is added to the impeller cover inlet, increasing the inlet area and thus increasing the airflow. This allows for a closer fit with the guide ring, optimizing the fluid flow path, reducing fluid loss during flow, and ensuring smoother fluid entry into the impeller, while also reducing noise. The flare also acts as a reinforcing rib, increasing the mechanical strength of the impeller cover, making the dimensions of the impeller cover more stable during manufacturing, and ensuring more stable vibration during impeller operation. By improving the gap structure, the problems of poor adaptability, large flow loss, poor performance under varying operating conditions, unstable air volume, high noise, low strength, and low efficiency have been solved, and the efficiency of the fan has been improved while meeting the requirements of air volume, air pressure, and noise.

Claims

1. A centrifugal fan impeller with a flow-collecting and stabilizing design, comprising a disc (1), blades (2), a cover (3), and a collector (4); the cover (3) is installed on one side of the blades (2), and the disc (1) is installed on the other side of the blades (2); the collector (4) is an integrally machined conical hollow cylinder, the outlet end of which is installed in the inlet channel of the cover (3); a flow-collecting and stabilizing channel is formed between the outer wall of the outlet end of the collector (4) and the inner wall of the inlet end of the cover (3); characterized in that: The wheel cover (3) includes a wheel cover conical arc section (31), a wheel cover frustum section (32), a wheel cover pressure stabilizing section (33), and a wheel cover outlet section (34) connected in sequence; an ejector ring (5) is provided in the flow collection and expansion channel, the ejector ring (5) includes an ejector conical arc section (51) and an ejector pressure stabilizing section (52) connected in sequence; the inner wall of the ejector ring (5) is fixedly connected to the outer wall of the collector (4) through a ring plate (6), and the outer wall of the ejector ring (5) is fixedly connected to the inner wall of the wheel cover (3) through a fixing rib (7); a plurality of jet holes (8) are uniformly provided on the ring plate (6); the wheel cover (3) and the ejector ring (5) enclose each other in the flow direction to form a first flow channel (9) including a conical arc inlet flow channel (91), a frustum pressure boosting flow channel (92), and a cylindrical pressure stabilizing flow channel (93); the ejector ring (5) and the collector (4) are in the flow direction The directional enclosure forms a second flow channel (10) including an ejector conical arc flow channel (101) and an ejector cylindrical pressure stabilizing flow channel (102); the conical arc inlet flow channel (91), the conical pressurizing flow channel (92), and the ejector conical arc flow channel (101) are all flow channels with reduced flow channel area along the flow direction; the cylindrical pressure stabilizing flow channel (93) and the ejector cylindrical pressure stabilizing flow channel (102) are both annular flow channels with unchanged flow channel area along the flow direction; the first flow channel (9) and the second flow channel (10) together form a flow collection and expansion stabilizing flow channel; the ejector ring (5) is installed in the flow collection and expansion stabilizing flow channel on the side closer to the collector (4); the curvature of the ejector conical arc segment (51) is greater than the curvature of the wheel cover conical arc segment (31); the angle between the wheel cover conical segment (32) and the horizontal plane is an acute angle; the cross-section of the jet hole (8) is a circular, elliptical, or quadrilateral structure.

2. The impeller of a centrifugal fan with flow collection and stabilization as described in claim 1, characterized in that, The perforation rate of the jet hole (8) on the annular plate (6) is 60-80%.

3. The impeller of a centrifugal fan with combined flow and stabilized structure as described in claim 1, characterized in that, The height of the cylindrical pressure-stabilizing channel (93) is H1, the height of the conical pressure-boosting channel (92) is H2, and the height of the ejector cylindrical pressure-stabilizing channel (102) is H3, where H3 = H1 + H2.

4. The impeller of a centrifugal fan with flow collection and stabilization as described in claim 3, characterized in that, H1≥H2.

5. The impeller of a centrifugal fan with flow collection and stabilization as described in claim 3, characterized in that, The height of the blade (2) is H, where H3 = (0.02~0.1)H.

6. The impeller of a centrifugal fan with combined flow and stabilized structure as described in claim 1, characterized in that, The blade (2) is a twisted blade.

7. The impeller of a centrifugal fan with flow collection and stabilization as described in claim 1, characterized in that, The axial width of the cylindrical pressure-stabilizing channel (93) is W1, and the axial width of the ejector cylindrical pressure-stabilizing channel (102) is W2, where W1 = (1.2~2.5)W2.

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