Centrifugal fan impeller with improved dynamic characteristics

Abstract

The utility model discloses a centrifugal fan impeller with improved dynamic characteristics, and relates to the technical field of impellers, the centrifugal fan impeller comprises an impeller front disc, blades, a reinforcing ring, an impeller rear disc and a shaft disc, a plurality of the blades are uniformly arranged between the impeller front disc and the impeller rear disc along the circumferential direction, the shaft disc is arranged in the middle of the impeller rear disc, and the reinforcing ring is arranged on the shaft disc. The shaft disc is used for being connected with a motor rotating shaft, and the reinforcing ring is arranged in the middle of each blade in a penetrating mode. According to the centrifugal fan impeller, the reinforcing rings are arranged on the blades, so that the rigidity of the centrifugal fan impeller is enhanced, the inherent frequency of a centrifugal fan is improved, the resonance risk is reduced, the noise is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of impellers, in particular to a centrifugal fan impeller with improved dynamic characteristics. Background Art

[0002] Centrifugal fans are a kind of general-purpose machinery with a wide range of applications. Due to its simple structure and high pressure, it is widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, ships and buildings; drying and selection of grains; drying of industrial assembly line product parts, etc. With the advancement of my country's industrialization process, the industrial industry is vigorously carrying out energy conservation and consumption reduction, carrying out industrial upgrading and integration and reorganization, and industrial basic equipment also needs a lot of updates. As an important supporting equipment for industry, energy conservation and environmental protection will become an important indicator of future product competitiveness. Careful design, manufacturing and reasonable use of centrifugal fans are of great significance to energy conservation and noise pollution reduction. The maturity of frequency converter technology enables centrifugal fans to run at variable speeds, and can achieve higher efficiency under different working conditions to achieve the purpose of energy saving. However, at the same time, the change in speed means that the rotation frequency of the fan is no longer a fixed value, but a range, which makes it more likely that the rotation frequency is close to or equal to the natural frequency of the centrifugal fan impeller, which is prone to resonance, resulting in large vibration, high noise, and even equipment damage. In addition, the key connection between the impeller and the motor shaft requires high processing precision and is difficult to assemble and disassemble. Poor matching quality will directly lead to an increase in the imbalance of the entire structure, increased vibration and noise when the fan rotates, and a shortened lifespan.

[0003] The existing centrifugal fan impellers often need to operate at variable frequency, which increases the risk of resonance compared to industrial frequency operation, causing increased vibration, increased noise and shortened service life when the fan rotates. Therefore, the utility model proposes a centrifugal fan impeller with improved dynamic characteristics, which achieves the purposes of reducing vibration, lowering noise and extending service life by enhancing the impeller stiffness and improving the connection method between the impeller and the motor. Utility Model Content

[0004] The utility model aims to provide a centrifugal fan impeller with improved dynamic characteristics to solve the problems existing in the above-mentioned prior art, thereby increasing the natural frequency of the centrifugal fan, reducing the risk of resonance and noise, and extending the service life of the equipment.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a centrifugal fan impeller with improved dynamic characteristics, comprising an impeller front disk, blades, a reinforcement ring, an impeller rear disk and a shaft disk, a plurality of blades are evenly arranged between the impeller front disk and the impeller rear disk along the circumferential direction, the shaft disk is arranged in the middle of the impeller rear disk, the shaft disk is used to be connected to the motor shaft, and the reinforcement ring is arranged through the middle of each blade.

[0007] Preferably, a through hole is provided at the centroid of the blade, and the reinforcement ring passes through each through hole and is welded to the through hole.

[0008] Preferably, the reinforcement ring is a round steel with a diameter of 3mm-6mm.

[0009] Preferably, the impeller rear disc and the shaft disc are connected by a plurality of bolts evenly distributed along the circumference.

[0010] Preferably, an expansion sleeve is provided between the shaft disc and the motor shaft.

[0011] Preferably, two ends of the blade are respectively welded to the impeller front disk and the impeller rear disk.

[0012] Compared with the prior art, the utility model has achieved the following technical effects:

[0013] The utility model increases the rigidity of the impeller of the centrifugal fan by arranging a reinforcing ring on the blades, and at the same time increases the natural frequency of the centrifugal fan, reduces the risk of resonance, reduces noise, and prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A top view of a centrifugal fan impeller with improved dynamic characteristics in an embodiment of the utility model;

[0016] Figure 2 A cross-sectional view of a centrifugal fan impeller with improved dynamic characteristics in an embodiment of the utility model;

[0017] In the figure: 1-impeller front disc, 2-blades, 3-reinforcement ring, 4-impeller rear disc, 5-shaft disc, 6-expansion coupling sleeve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] The utility model aims to provide a centrifugal fan impeller with improved dynamic characteristics to solve the problems existing in the prior art, thereby increasing the natural frequency of the centrifugal fan, reducing the risk of resonance and noise, and extending the service life of the equipment.

[0020] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] like Figure 1 to Figure 2 As shown, in this embodiment, a centrifugal fan impeller with improved dynamic characteristics is provided, including an impeller front disc 1, blades 2, a reinforcement ring 3, an impeller rear disc 4 and a shaft disc 5. A plurality of blades 2 are evenly arranged between the impeller front disc 1 and the impeller rear disc 4 along the circumferential direction, and a shaft disc 5 is arranged in the middle of the impeller rear disc 4. The shaft disc 5 is used to connect with the motor shaft. In this embodiment, the reinforcement ring 3 is arranged through the middle of each blade 2, which enhances the rigidity of the centrifugal fan impeller, while increasing the natural frequency of the centrifugal fan and reducing the risk of resonance.

[0022] As an optional solution, in this embodiment, a through hole is provided on the centroid of the blade 2, and the reinforcement ring 3 passes through each through hole and is welded to the through hole to achieve the fixation of the reinforcement ring 3 and the blade 2. In this embodiment, the reinforcement ring 3 is fixed on the centroid of the blade 2 (the closer to the centroid, the better the effect), and the weakening of the strength of the blade 2 is minimal. If a groove is processed on the edge of the blade 2, and the reinforcement ring 3 is welded and fixed in the groove, firstly, the groove weakens the strength of the blade 2, and the risk of the blade 2 tearing at this position increases; secondly, the restraining effect of the groove on the reinforcement ring 3 is far less than that of the circular hole, and the welding strength requirement is higher. Due to the failure of the weld, the risk of the reinforcement ring 3 falling off will also increase.

[0023] As an optional solution, in this embodiment, the reinforcement ring 3 is a round steel with a diameter of 3mm-6mm, preferably a diameter of 4mm, which is convenient for construction and has sufficient strength.

[0024] As an optional solution, in this embodiment, the impeller rear disc 4 and the shaft disc 5 are connected by a plurality of bolts evenly distributed along the circumference, so that the connection is firm and the force is evenly applied.

[0025] As an optional solution, in this embodiment, an expansion sleeve 6 is provided between the shaft disc 5 and the motor shaft. By tightening the screws, a locking connection with the motor shaft is achieved, which reduces the machining accuracy requirements of the shaft hole of the shaft disc 5 in the centrifugal fan impeller, improves the convenience of impeller installation and disassembly, and makes the impeller and the motor shaft more uniform in force. The expansion sleeve 6 replaces the conventional key connection method, which reduces the difficulty of processing and assembly, and avoids the increase in structural imbalance caused by poor key connection quality and assembly tolerance, which in turn leads to a series of problems such as large fan vibration, high noise, and shortened service life.

[0026] As an optional solution, in this embodiment, the upper and lower ends of the blade 2 are respectively welded to the impeller front disk 1 and the impeller rear disk 4 to form an integral structure to avoid assembly vibration.

[0027] The setting of the reinforcing ring 3 in this embodiment enhances the rigidity of the centrifugal fan impeller, increases the natural frequency, and greatly reduces the risk of resonance. At the same time, the expansion coupling sleeve 6 replaces the conventional key connection, which is easy to process and assemble, and avoids the increase in structural imbalance caused by poor key connection quality, which leads to a series of problems such as large fan vibration, high noise, and shortened service life, and has high safety. The centrifugal fan impeller with improved dynamic characteristics in this embodiment has low overall processing difficulty, will not bring about a significant increase in cost, and reduces the vibration and noise of the fan, which helps to extend the service life of the centrifugal fan, making this centrifugal fan impeller applicable to a wider range of working conditions, simple and convenient assembly and disassembly, safe and stable, environmentally friendly and low noise, and more competitive in the product market.

[0028] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A centrifugal fan impeller with improved dynamic characteristics, characterized in that: It includes an impeller front disk, blades, a reinforcement ring, an impeller rear disk and a shaft disk. A plurality of blades are evenly arranged between the impeller front disk and the impeller rear disk along the circumferential direction. The shaft disk is arranged in the middle of the impeller rear disk. The shaft disk is used to be connected to the motor shaft. The reinforcement ring is arranged through the middle of each blade.

2. The centrifugal fan impeller with improved dynamic characteristics according to claim 1, characterized in that: A through hole is arranged at the centroid of the blade, and the reinforcement ring passes through each through hole and is welded to the through hole.

3. The centrifugal fan impeller with improved dynamic characteristics according to claim 1, characterized in that: The reinforcement ring is a round steel with a diameter of 3mm-6mm.

4. The centrifugal fan impeller with improved dynamic characteristics according to claim 1, characterized in that: The impeller rear disc is connected to the shaft disc via a plurality of bolts evenly distributed along the circumference.

5. The centrifugal fan impeller with improved dynamic characteristics according to claim 1, characterized in that: An expansion sleeve is arranged between the shaft disc and the motor shaft.

6. The centrifugal fan impeller with improved dynamic characteristics according to claim 1, characterized in that: Two ends of the blade are respectively welded to the impeller front disk and the impeller rear disk.

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