CN209261907U - A kind of Centrifugal Fan Impeller collector with bionical broached-tooth design - Google Patents

Abstract

The utility model discloses a kind of Centrifugal Fan Impeller collector with bionical broached-tooth design, including Centrifugal Fan Impeller, the entrance of the impeller upper cover of Centrifugal Fan Impeller is equipped with collector, and the outlet side of collector is equipped with laciniation.Laciniation is set on side by exporting in collector, effectively reduces the aerodynamic noise that gap location generates between collector bottom and impeller upper cover import, improves the aeroperformance of ventilation blower.

Description

A centrifugal fan impeller collector with bionic sawtooth structure

technical field

The utility model belongs to the technical field of mechanical equipment and relates to a centrifugal fan impeller collector with a bionic sawtooth structure.

Background technique

In the fan field, the inlet of the centrifugal impeller usually has a collector structure, whose function is to ensure that the airflow can evenly fill the inlet section of the impeller and reduce the flow loss. There is a gap between the conventional collector and the inlet of the impeller upper cover, which causes the gas to generate a high-speed gap leakage flow here. When the high-speed air flow passes through the gap, noise will be generated, which will reduce the quiet performance of the fan. Therefore, the optimization of the collector profile is of great significance for reducing the flow loss of the fan and improving the efficiency of wind energy utilization.

Utility model content

The purpose of this utility model is to provide a centrifugal fan impeller collector with a bionic sawtooth structure. By adding a sawtooth shape to the outlet edge of the collector, the gap between the bottom of the collector and the inlet of the upper cover of the impeller is effectively reduced. Generated aerodynamic noise, and effectively improve the aerodynamic performance of the fan.

The technical solution adopted by the utility model is, a centrifugal fan impeller collector with a bionic sawtooth structure, including a centrifugal fan impeller, a collector is provided at the entrance of the impeller upper cover of the centrifugal fan impeller, and the current collector The outlet edge of the device is provided with a sawtooth structure.

The utility model is also characterized in that,

The jagged structure is an equilateral triangle.

The sawtooth height of the sawtooth structure is equal to the side length of the equilateral triangle times.

The unilateral radial gap between the outlet edge of the collector and the inlet of the upper cover of the impeller is 2 mm to 4 mm.

The depth at which the outlet side of the collector is inserted into the upper cover of the impeller is 0.03D _in , where D _in is the diameter of the impeller inlet.

The sawtooth structure is in the shape of a sine wave.

The beneficial effects of the utility model are as follows: the bottom of the current collector inserted into the inlet of the centrifugal fan is serrated, and the bionic structure is adopted to improve the efficiency of the impeller of the centrifugal fan and reduce the working noise of the centrifugal fan, thereby strengthening the impeller of the centrifugal fan Aerodynamic performance and running stability. Through test comparison, it is found that the efficiency of the highest efficiency point is increased by 5% when the current collector of the present invention is compared with the conventional cylindrical current collector.

Description of drawings

Fig. 1 is a structural schematic diagram of a centrifugal fan impeller collector with a bionic sawtooth structure of the present invention;

Fig. 2 is a cross-sectional view of a centrifugal fan impeller collector with a bionic sawtooth structure of the utility model in which the collector and the upper cover of the impeller are installed together;

Fig. 3 is a three-dimensional structural schematic diagram of a current collector in a centrifugal fan impeller collector with a bionic sawtooth structure of the present invention;

Fig. 4 is a structural schematic diagram of a first embodiment of a sawtooth structure in a centrifugal fan impeller collector with a bionic sawtooth structure of the present invention;

Fig. 5 is a structural schematic diagram of a second embodiment of the sawtooth structure in the impeller collector of the centrifugal fan with the bionic sawtooth structure of the present invention.

In the figure, 1. The centrifugal fan impeller, 2. The upper cover of the impeller, 3. The current collector, 4. The serrated structure.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model is a centrifugal fan impeller current collector with a bionic sawtooth structure, as shown in Fig. The current collector 3 is provided with a serrated structure 4 on the outlet side of the current collector 3 .

As shown in Figure 4, the sawtooth structure 4 is a regular triangle, the height of the sawtooth of the regular triangle is h, and the side length is t. According to the geometric relationship of the regular triangle, the calculation formula of h is shown in the following formula (1):

The side length t of the equilateral triangle teeth can be obtained by dividing the circumference of the outlet side of the current collector 3 by the number of teeth N. The number of teeth N can be selected from 80 to 100 for small centrifugal fans whose impeller 1 outer diameter is less than 300mm. Fan impeller 1 takes 120-160 for large fans whose outer diameter is greater than 300mm.

The unilateral radial gap d _t between the outlet edge of the collector 3 and the inlet of the impeller upper cover 2 is 2 mm to 4 mm, so as to minimize the influence of the radial gap;

The depth h ₂ of the outlet edge of the collector 3 inserted into the upper cover 2 of the impeller is 0.03D _in , which ensures that the bionic zigzag tail of the collector 3 can effectively reduce clearance leakage noise. Among them, D _in is the diameter of the impeller 1 inlet of the centrifugal fan.

As shown in FIG. 5, the sawtooth structure 4 is in the shape of a sine wave. The amplitude of the sinusoidal sawtooth is s/2 and the wavelength is λ. The value of the sinusoidal sawtooth s is taken as 50% to 70% of the axial distance of the current collector 3 inserted into the upper cover 2 of the impeller, and the calculation formula for the wavelength λ of the sinusoidal tooth can be divided by the circumference of the outlet edge of the current collector 3 divided by The number of teeth N is obtained. The number of teeth N can be selected from 80 to 100 for a small centrifugal fan with an outer diameter of the impeller 1 of the centrifugal fan less than 300mm, and 120 to 160 for a large fan with an outer diameter of the impeller 1 of the centrifugal fan greater than 300mm.

The utility model is a centrifugal fan impeller current collector with a bionic sawtooth structure, which is characterized in that the profile line of the current collector is reasonably set, and the smooth transition between the current collector and the internal profile line of the impeller of the centrifugal fan is realized, and centrifugal ventilation During the operation of the turbine impeller, the gas leakage at the gap between the bottom of the collector and the inlet of the upper cover of the impeller is significantly reduced, effectively reducing the flow loss at the inlet; by setting the sawtooth structure at the bottom of the collector, the noise reduction effect of the fan is remarkable, The aerodynamic performance has been significantly improved.

Claims (6)

1. A centrifugal fan impeller collector with a bionic sawtooth structure, characterized in that it comprises a centrifugal fan impeller (1), and the impeller loam cake (2) inlet of the centrifugal fan impeller (1) is provided with a collector device (3), the outlet edge of the current collector (3) is provided with a serrated structure (4). 2. A centrifugal fan impeller collector with bionic sawtooth structure according to claim 1, characterized in that: said sawtooth structure (4) is an equilateral triangle. 3. A centrifugal fan impeller collector with bionic sawtooth structure according to claim 2, characterized in that: the sawtooth height of the sawtooth structure (4) is equal to the side length of an equilateral triangle times. 4. A centrifugal fan impeller collector with a bionic sawtooth structure according to claim 1, characterized in that: a single gap between the outlet edge of the collector (3) and the inlet of the impeller upper cover (2) The side radial clearance is 2mm ~ 4mm. 5. A centrifugal fan impeller collector with bionic sawtooth structure according to claim 1, characterized in that: the outlet edge of the collector (3) is inserted into the impeller upper cover (2) to a depth of 0.03D _in , where D _in is the impeller inlet diameter. 6. A centrifugal fan impeller collector with bionic sawtooth structure according to claim 1, characterized in that: said sawtooth structure (4) is in the shape of a sine wave.