High-energy-efficiency centrifugal fan impeller

Abstract

The utility model discloses a high-energy-efficiency centrifugal fan impeller and relates to the field of fans, the fan impeller comprises an annular front disc, a circular rear disc concentrically opposite to the front disc and blades annularly distributed between the front disc and the rear disc, and the upper edges and the lower edges of the blades are fixedly riveted to the front disc and the rear disc respectively; the adjacent blades are matched to form a gradually-expanded working channel, and the sectional area of the working channel is gradually increased from the axis to the outer edge to form a gradually-expanded flow channel; two arc-shaped flow guide protrusions are arranged on the front face of the blade in the direction of the working flow channel, and a flow guide wing in the direction of the working flow channel is arranged in the center of the back face of the blade. And the outer edges of the blades are zigzag. According to the fan blade wind wheel, the high-efficiency impeller design is adopted, airflow flowing can be better controlled, vortexes and resistance are reduced, and therefore the overall energy efficiency is improved. Therefore, the efficiency of a flue gas treatment system is improved, the energy consumption in industrial production is reduced, and a powerful technical support is provided for the realization of an environmental protection target.

Description

Technical Field

[0001] The present application relates to the field of fans, and in particular to a high-energy-efficiency high-center fan impeller. Background Art

[0002] Currently, centrifugal fans, as key equipment in flue gas treatment systems, are widely used in various fields of industrial production. Their primary function is to provide air volume and pressure through rotating impellers, effectively driving the flow of flue gas. However, with increasing environmental protection requirements and concerns about energy consumption, existing centrifugal fan systems are gradually showing some shortcomings in performance and efficiency, especially in terms of air volume, air pressure, and operating noise, which still leaves significant room for improvement. Although existing technologies have made certain progress, their performance is still less than ideal when addressing the increasingly complex needs of flue gas treatment.

[0003] One of the main problems with existing centrifugal fans is their low energy efficiency. This is mainly due to the fact that the impeller design is not optimized enough, which leads to greater resistance and vortex phenomena during the airflow process, thereby increasing energy consumption. In addition, when the fan provides a large air volume and air pressure, it is often accompanied by high operating noise. Especially in the application scenario of industrial flue gas treatment, this problem is more prominent. Noise not only has an adverse impact on the working environment, but may also cause noise pollution to the surrounding environment. Existing improvement measures, such as optimizing the casing design or increasing the fan speed, can reduce noise and increase air volume to a certain extent, but they also bring higher energy consumption and equipment wear, and cannot achieve true high efficiency and environmental protection.

[0004] These deficiencies not only affect the efficiency of the fan but also increase long-term operating costs. Therefore, in the field of flue gas treatment, it is of great practical significance to develop a centrifugal fan impeller that can significantly reduce energy consumption and noise while maintaining high air volume and pressure. Utility Model Content

[0005] The purpose of this application is to overcome at least one shortcoming of the existing technology and provide a highly energy-efficient centrifugal fan impeller. This impeller utilizes a high-efficiency impeller design to better control airflow, reduce eddy currents and drag, and thus improve overall energy efficiency. This will help improve the efficiency of flue gas treatment systems, reduce energy consumption in industrial production, and provide strong technical support for achieving environmental protection goals. Furthermore, reducing noise pollution can significantly improve the working environment and enhance the green environmental performance of industrial equipment.

[0006] To achieve the above-mentioned objectives, the present application discloses a high-energy-efficiency centrifugal fan impeller, which includes an annular front disk, a circular rear disk concentrically opposite to the front disk, and blades arranged between the front disk and the rear disk, wherein the upper and lower edges of the blades are riveted to the front disk and the rear disk respectively; the adjacent blades cooperate to form a gradually expanding working channel, and the cross-sectional area of ​​the working channel gradually increases from the axis to the outer edge, forming a gradually expanding flow channel; the blade is provided with two arc-shaped guide protrusions on the front along the direction of the working flow channel, and a guide wing is provided along the direction of the working flow channel at the center of the back of the blade; the outer edge of the blade is serrated.

[0007] In some embodiments, the outer surface of the blade has a fluoropolymer coating.

[0008] In some embodiments, the cross-section of the guide protrusion is arc-shaped, and the height is 20%-30% of the thickness of the blade.

[0009] In some embodiments, the cross-section of the guide wing is triangular.

[0010] In some embodiments, there are 7 blades.

[0011] In some embodiments, the center of the front disc is an air inlet, and the inner edge of the front disc expands outward in an arc shape along the axis to guide the air inlet.

[0012] Compared with the prior art, this application has at least one of the following beneficial effects:

[0013] 1. Improve airflow guidance and efficiency: Optimize the airflow path through the guide protrusions and guide wings on the blades, reduce airflow separation and vortex phenomena, and thus improve the aerodynamic efficiency of the fan.

[0014] 2. Reduce noise and energy loss: The serrated design of the blade edge can disperse air turbulence, reduce noise during fan operation, and reduce pressure loss at the blade tip, thereby improving overall work efficiency.

[0015] 3. Enhanced corrosion resistance and durability: The outer surface of the blade is covered with a fluoropolymer coating, which provides excellent anti-corrosion and anti-stick properties, extending the service life of the impeller in harsh environments.

[0016] The above-listed beneficial effects are not exhaustive and other potential beneficial effects and detailed technical implementations will be further disclosed in the examples or other description sections of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] After reading the following detailed description in conjunction with the accompanying drawings, you will better understand the various aspects of the present disclosure. The positions, sizes, and ranges of various structures shown in the drawings and the like sometimes do not represent the actual positions, sizes, and ranges. In the drawings:

[0018] Figure 1 It is a structural diagram of an embodiment disclosed in this application.

[0019] Figure 2 It is a schematic structural diagram of a blade in an embodiment disclosed in this application.

[0020] Figure 3 This is a schematic structural diagram of a blade in an embodiment disclosed in the present application from another perspective. DETAILED DESCRIPTION

[0021] The present disclosure will be described below with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the present disclosure more complete and fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide many additional embodiments.

[0022] It should be understood that like reference numerals refer to like elements throughout the drawings. In the drawings, the dimensions of some features may be distorted for clarity.

[0023] It should be understood that the terms used in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms (including technical and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, the techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered part of the authorized specification.

[0024] As used in this specification, the singular forms "a," "an," "said," and "the" include the plural forms unless otherwise expressly stated. The words "include," "comprise," and "contain" as used in this specification indicate the presence of the claimed features, but do not exclude the presence of one or more additional features. The word "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0025] Example:

[0026] like Figure 1-3 As shown, this embodiment discloses a centrifugal fan impeller suitable for use in flue gas treatment equipment. Specifically, the overall structure of the centrifugal fan impeller consists of an annular front disc 1, a circular rear disc 2 concentrically opposite to the front disc 1, and a plurality of blades 3 evenly arranged between the front disc 1 and the rear disc 2.

[0027] Both the front disc 1 and the rear disc 2 are constructed from high-strength aluminum alloy, offering excellent corrosion resistance and structural strength, ensuring structural stability even at high-speed rotation. The center of the front disc 1 features an air inlet, whose inner edge arcs outward axially, forming a smooth guide surface that smoothly directs incoming air into the impeller, minimizing turbulence and pressure loss, and improving the fan's air intake efficiency.

[0028] The upper edge of blade 3 is riveted to front disc 1, and the lower edge is similarly riveted to rear disc 2. Specifically, several evenly spaced rivet holes are provided on the upper and lower edges of blade 3, precisely matching the corresponding holes on front disc 1 and rear disc 2. During assembly, high-strength rivets securely connect blade 3 to front disc 1 and rear disc 2. This riveted connection provides a reliable mechanical fixation that can withstand the enormous centrifugal and aerodynamic forces generated by the high-speed rotation of the impeller, ensuring that the blades will not loosen or fall off.

[0029] It's important to understand that riveting provides a high-strength mechanical connection, effectively resisting the mechanical stresses generated during rotation. Furthermore, the rivet heads are precisely machined to a smooth surface, eliminating airflow obstruction and ensuring smooth flow over the blade 3, minimizing turbulence and energy loss. Furthermore, the riveted connection exhibits excellent vibration resistance, effectively resisting vibrations caused by rotation and airflow, thereby extending the life of the equipment.

[0030] Furthermore, in this embodiment, blades 3 are made of high-strength aluminum alloy or stainless steel. The choice of material is determined by the specific application requirements. For example, the high-strength aluminum alloy used in this embodiment offers the advantages of lightweight construction and low density, which can reduce the overall weight of the impeller and lower the motor's starting load and energy consumption. Furthermore, aluminum alloys possess high strength and good ductility, making them able to withstand the mechanical stresses generated during rotation. Furthermore, they easily form a dense oxide film on their surface, providing a certain degree of corrosion resistance.

[0031] To further enhance the performance of blade 3, in this embodiment, the surface of blade 3 is covered with a fluoropolymer coating, the primary component of which is polytetrafluoroethylene (PTFE). This coating is evenly applied to the surface of blade 3 via a spray or dip coating process and, after high-temperature curing, forms a dense coating with a thickness of 50 to 100 microns. The PTFE coating has an extremely low coefficient of friction of approximately 0.04. This significantly reduces the frictional resistance of the airflow over the surface of blade 3, reduces the thickness of the boundary layer and the formation of turbulence, and improves aerodynamic efficiency.

[0032] Furthermore, the PTFE coating offers excellent corrosion resistance, resisting erosion by strong acids, strong bases, oxidants, and organic solvents, protecting the blade substrate for long-term stable operation in corrosive environments. It maintains physical and chemical stability within a temperature range of -200°C to +260°C, adapting to wind turbine operation in both high and low temperature conditions.

[0033] Because PTFE has an extremely low surface energy, it resists the adhesion of dust, oil, and other impurities, and exhibits a self-cleaning function, reducing the frequency of maintenance and cleaning. The PTFE coating is also resistant to aging and weathering, preventing aging, cracking, or fading over long-term use, ensuring the durability of the blade 3 in various environmental conditions.

[0034] Blades 3 are distributed at specific unequal angles between the front disc 1 and the rear disc 2, forming seven gradually diverging working channels 4. The angles between adjacent blades 3 are precisely designed and unequally distributed to prevent resonance during impeller rotation and reduce noise. The cross-sectional area of ​​the working channels 4 formed between adjacent blades 3 gradually increases from the axis to the outer edges, forming a gradually diverging flow path. This design adapts to the characteristic outward movement of air from the axis under the action of centrifugal force, accommodating the expansion and acceleration of the airflow, reducing air compression and turbulence, minimizing energy loss, and improving the fan's aerodynamic efficiency.

[0035] Two curved guide protrusions 5 are positioned on the front of the blade 3, along the working flow path. Their cross-sections are curved, and their height is 20% to 30% of the blade thickness. A triangular-shaped guide vane 6 is positioned at the center of the back of the blade 3, along the working flow path. These guide structures are manufactured directly onto the blade using an integrated molding process and are securely connected to the blade 3 itself.

[0036] It's important to understand that the guide protrusions 5 and guide wings 6 work together to effectively optimize the flow characteristics of the airflow on both sides of the blade. When air enters the impeller, it first encounters the guide protrusions 5 on the front of the blade. Because the guide protrusions 5 are arranged along the flow direction of the airflow, their curved cross-section smoothly guides the airflow, allowing it to flow smoothly along the blade surface. This not only reduces turbulence and separation on the windward side, but also lowers the pressure gradient and minimizes energy loss.

[0037] After the airflow passes over the front of the blade and enters the working channel 4, it is further accelerated and moved outward as the impeller rotates. During this process, when the airflow reaches the back of the blade, the guide vanes 6 come into play. The design of the guide vanes 6 guides the airflow, ensuring smooth flow over the back of the blade and preventing turbulence and airflow separation. This reduces pressure loss on the leeward side and improves energy efficiency.

[0038] The combination of guide protrusions 5 and guide vanes 6 effectively guides the airflow on both the front and back sides of blade 3. Working together, they keep the airflow close to the surface of blade 3, reducing turbulence and eddies, minimizing energy loss, and improving the aerodynamic efficiency of blade 3. This integrated guide design optimizes the overall flow path of the airflow, enabling the fan to operate at a higher efficiency.

[0039] like Figure 2 、 3 As shown, in this embodiment, the outer edge of the blade 3 is designed to be serrated, and the size and shape of the serrations are precisely calculated and processed to ensure consistency. The serrated edge divides the airflow into multiple small airflows, reducing the probability of forming a single large vortex, reducing vortex generation and energy loss. The energy and noise of small vortices are lower than those of large vortices, so the overall noise level is reduced. The serrated structure makes the release of the airflow at the end of the blade 3 smoother, reduces pressure pulsation and turbulence, and improves operational stability. Through this design, the noise level of the fan at high speed can be greatly reduced, which is particularly suitable for industrial scenarios that require a quiet environment, such as flue gas treatment plants and exhaust gas purification systems.

[0040] In actual use, this high-efficiency centrifugal fan impeller demonstrates excellent performance in flue gas treatment equipment. The interplay of guide protrusions 5 and guide vanes 6 on blades 3 not only optimizes airflow on the front and back sides of blades 3, reducing turbulence and airflow separation, lowering energy losses, and improving aerodynamic efficiency, but also enhances the structural strength of blades 3, acting like structural ribs.

[0041] To demonstrate the technical advantages of the centrifugal fan impeller design in this embodiment, a detailed comparative experiment was conducted. Two fan impellers with different designs were selected: one with a traditional smooth blade design, and the other with the high-efficiency impeller described in this embodiment, featuring guide protrusions 5, guide vanes 6, and a serrated edge. The experiments were conducted under identical test conditions, including fan speed, ambient temperature, airflow medium, and load. The experiments comprehensively evaluated the performance differences between the two impellers by measuring parameters such as air volume, air pressure, energy consumption, and operating noise.

[0042] The following is a comparison of fan impeller performance data:

[0043] parameter Traditional impeller The impeller of this embodiment <![CDATA[Air volume (m 3 / h)]]> 4500 5200 Wind pressure (Pa) 350 420 Power consumption (kW) 5.5 4.8 Noise level (dB) 78 69 Air volume change after corrosion / dust accumulation (%) -5 -2

[0044] Data Analysis:

[0045] Air volume and air pressure: The air volume of the impeller in this embodiment is 5200m 3 / h, which is 4500m / h higher than the traditional impeller 3 / h increased by about 15.6%; the wind pressure also increased from 350 Pa to 420 Pa, an increase of about 20%. These data show that the design of the guide protrusion 5 and the serrated edge can more efficiently promote the airflow of the impeller of this embodiment, thereby increasing the air volume and pressure of the fan.

[0046] Energy consumption: Under the same air volume conditions, the impeller of this embodiment consumes 4.8kW of power, which is lower than the 5.5kW of the traditional impeller, reducing energy consumption by approximately 12.7%. This means that under the same output conditions, the impeller of this embodiment can reduce energy consumption and improve the efficiency of the fan.

[0047] Noise: The noise level of a conventional impeller is 78dB, while the impeller in this embodiment significantly reduces noise to 69dB. This 9dB difference demonstrates the effectiveness of the serrated edge design in reducing airflow turbulence and noise, making it particularly suitable for industrial applications requiring low-noise operation.

[0048] Corrosion and dust accumulation: During long-term operation, conventional impellers experience a 5% reduction in air volume due to corrosion and dust accumulation. However, the impellers in this embodiment, protected by the fluoropolymer coating, experience a 2% reduction in air volume, showing no significant change. The coating's corrosion and dust resistance extend the equipment's service life and improve maintenance efficiency.

[0049] In summary, the fan impeller of this embodiment shows obvious technical advantages in terms of air volume, wind pressure, energy consumption, noise and long-term performance, proving the practicality and economy of the design.

[0050] Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications may be made to the exemplary embodiments of the present disclosure without departing substantially from the spirit and scope of the present disclosure. Therefore, all such changes and modifications are intended to be within the scope of protection of the present disclosure as defined by the appended claims. The present disclosure is defined by the appended claims, and equivalents of these claims are intended to be included therein.

Claims

1. A high energy efficiency centrifugal fan impeller, characterized in that: The fan impeller includes: an annular front disk, a circular rear disk concentrically opposite to the front disk, and blades arranged between the front disk and the rear disk, wherein the upper and lower edges of the blades are riveted to the front disk and the rear disk respectively; the adjacent blades cooperate to form a gradually expanding working channel, and the cross-sectional area of ​​the working channel gradually increases from the axis to the outer edge, forming a gradually expanding flow channel; the blades are provided with two arc-shaped guide protrusions on the front along the direction of the working flow channel, and a guide wing along the direction of the working flow channel is provided in the center of the back of the blade.

2. A high energy efficiency centrifugal fan impeller as claimed in claim 1, characterized in that: The outer surface of the blade has a fluoropolymer coating.

3. A high energy efficiency centrifugal fan impeller as claimed in claim 1, characterized in that: The cross section of the guide protrusion is arc-shaped, and the height is 20%-30% of the thickness of the blade.

4. A high energy efficiency centrifugal fan impeller as claimed in claim 1, characterized in that: The cross section of the guide wing is triangular.

5. The high energy efficiency centrifugal fan impeller as claimed in claim 1, characterized in that: There are 7 leaves.

6. The high energy efficiency centrifugal fan impeller as claimed in claim 1, characterized in that: The center of the front disc is an air inlet, and the inner edge of the front disc expands outward in an arc shape toward the axis to guide the air inlet.

7. A high energy efficiency centrifugal fan impeller as claimed in claim 1, characterized in that: The outer edge of the blade is sawtooth-shaped.

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