CN219242249U

CN219242249U - Novel centrifugal fan impeller and fan

Info

Publication number: CN219242249U
Application number: CN202320070082.1U
Authority: CN
Inventors: 贾海军; 陈宗华
Original assignee: Xi'an Fanshida Fluid Machinery Co ltd
Current assignee: Xi'an Fanshida Fluid Machinery Co ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-06-23
Anticipated expiration: 2033-01-10

Abstract

The utility model discloses a novel centrifugal fan impeller and a novel centrifugal fan, which comprise a current collector, a wheel cover, blades, a wheel disc and a motor, wherein the wheel disc is fixedly connected with the motor; the function of the current collector is utilized to realize the conversion of air flow from axial direction to radial direction, so that the fan structure is more compact, and the impeller height is reduced. The beneficial effects of the utility model are as follows: the function of the current collector is utilized to realize the conversion of air flow from axial direction to radial direction, so that the fan structure is more compact, and the impeller height is reduced; because the diameter of the inlet is relatively large, the air quantity is increased, the rotating speed is reduced under the same air quantity, and the noise is reduced; the wind wheel has reduced height, reduced weight and reduced cost; the wind wheel strength is increased due to the obvious reduction of the height of the wheel cover; the diameter of the inlet is obviously increased, so that the wind wheel is easier to be ejected from the die.

Description

Novel centrifugal fan impeller and fan

Technical Field

The utility model belongs to the technical field of fans, and particularly relates to a novel centrifugal fan impeller and a fan.

Background

For the backward centrifugal fan, due to the structural specificity, the airflow at the position close to the wheel cover needs to turn rapidly, so that the airflow is changed from axial direction to radial direction, and flows out from radial direction after acting through the blades, therefore, a certain distance is needed from the inlet of the wheel cover to the blade area, the loss generated during airflow conversion can be ensured to be smaller, but the height of the impeller is increased, so that the height of the impeller is increased, the weight is increased, and the cost is increased.

Disclosure of Invention

The utility model aims to provide a novel centrifugal fan impeller and a novel centrifugal fan, and airflow is converted from axial direction to radial direction through a current collector, so that the novel centrifugal fan impeller is more compact in structure, high in air quantity and low in cost.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the novel centrifugal fan comprises a current collector, a wheel cover, blades, a wheel disc and a motor, wherein the wheel disc is fixedly connected with the motor, the blades are fixedly connected with the wheel disc, the tops of the blades are provided with blade tops, one part of the blade tops is connected with the wheel cover, and the other part of the blade tops is in clearance fit or gapless fit with the current collector; the function of the current collector is utilized to realize the conversion of air flow from axial direction to radial direction, so that the fan structure is more compact, and the impeller height is reduced.

The flow collector comprises an inlet, a throat part, a first outlet and a second outlet, the first section and the second section of the outlet are provided with stepped sections on the inner surface of the flow collector, and the outlet part of the flow collector is consistent with the molded line of the wheel cover, so that the air flow can be ensured to uniformly enter the impeller, and the flow loss is reduced.

The blade tops are provided with blade top gaps.

Preferably, the device further comprises current collector parameters phi and theta, wherein the current collector parameters phi= (10-70 degrees) and theta= (0-60 degrees).

Preferably, the inlet diameter/throat diameter/outlet diameter = (1.2-3)/(1-2)/(1.2-6).

Preferably, the cross-section heights H1, H2 and H3 are also included, and the cross-section heights of the current collector are as follows: h1/H2/h3= (1-3)/(0-4)/(1-2).

Preferably, the blade assembly further comprises a first gap, a butt joint gap and a fit gap, wherein the first gap is = (0.0075-0.015) multiplied by d2, and the first gap between the part of the blade with the gap and the current collector ensures that the blade and the current collector cannot rub; butt gap= (0.0075-0.01) x d2, which ensures that the wheel cover inlet position and the current collector will not rub; fit clearance = (0.0075-0.015) x d2, which ensures that the upper surface of the shroud will not rub against the current collector.

Preferably, the blade is of a ternary airfoil structure, and comprises a blade top, a tail edge, a blade top chord line, a front edge and a blade root, wherein the blade is designed in a forward bending and backward sweeping manner, the inlet angle is basically unchanged along the height direction of the blade, the outlet angle is gradually reduced, and the fan is guaranteed to have better aerodynamic performance.

Preferably, the part of the wheel disc molded line, which is close to the motor, is a straight curve, and the section molded line is downward at the outlet part, so that the outlet pressure of the fan can be increased.

The novel centrifugal fan impeller comprises a blade with a gap, a wheel cover and a wheel disc.

Compared with the prior art, the utility model has the beneficial effects that:

(1) The function of the current collector is utilized to realize the conversion of air flow from axial direction to radial direction, so that the fan structure is more compact, and the impeller height is reduced;

(2) Because the diameter of the inlet is relatively large, the air quantity is increased, the rotating speed is reduced under the same air quantity, and the noise is reduced;

(3) The wind wheel has reduced height, reduced weight and reduced cost;

(4) The wind wheel strength is increased due to the obvious reduction of the height of the wheel cover;

(5) The diameter of the inlet is obviously increased, so that the wind wheel is easier to be ejected from the die.

Drawings

FIG. 1 is a schematic view of a current collector of the present utility model in a mode of being sleeved with an impeller;

FIG. 2 is a schematic view of the mating structure of the collector and impeller of the present utility model;

FIG. 3 is a schematic view of a current collector according to the present utility model;

FIG. 4 is a schematic view of the mating structure of the wheel cover, current collector and wheel disc of the present utility model;

fig. 5 is an enlarged schematic view of the connection structure of the current collector and the wheel cover of the present utility model;

FIG. 6 is a schematic view of a blade structure according to the present utility model;

FIG. 7 is a schematic view of a centrifugal fan adopting an inner sleeve structure with an impeller;

fig. 8 is a tip view of a blade of the present utility model.

In the figure: 1. collector, 11, inlet, 12, throat, 13, outlet one, 14, outlet two, 2, shroud, 3, blade, 31, trailing edge, 32, tip chord, 34, leading edge, 35, blade root, 4, disk, 5, motor, 6, impeller, 1, first gap, 2, butt gap, 3, mating gap, 8, tip.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Referring to fig. 1 to 8, the present utility model provides a technical solution: the novel centrifugal fan comprises a current collector 1, a wheel cover 2, a blade 3, a wheel disc 4 and a motor 5, wherein the wheel disc 4 is fixedly connected with the motor 5, the blade 3 is fixedly connected with the wheel disc 4, a blade top 8 is arranged at the top of the blade 3, one part of the blade top 8 is connected with the wheel cover 2, and the other part of the blade top 8 is in clearance fit or clearance fit with the current collector 1; the current collector 1 adopts an outer sleeve or an inner sleeve, and the function of the current collector 1 is utilized to realize the conversion of air flow from axial direction to radial direction, so that the fan structure is more compact, the impeller height is reduced, the air quantity is increased due to the relatively larger diameter of an inlet, the rotating speed is reduced under the same air quantity, and the noise is reduced.

The collector 1 comprises an inlet 11, a throat part 12, an outlet I13 and an outlet II 14, the sections of the outlet I13 and the outlet II 14 of the cross section ensure that the stepped opening of the collector 1 is in butt joint with the inlet of the wheel cover 2, the stepped section is arranged on the inner surface of the collector 1, the outlet part of the collector 1 is consistent with the molded line of the wheel cover 2, and the air flow can be ensured to uniformly enter the impeller so as to reduce the flow loss.

The wheel cover 2, the collector 1 and the wheel disc 4 are matched with each other as shown in fig. 4, so that radial flow channels are formed in the impeller by airflow, and the axial incoming flow is converted into radial outlet airflow.

The blade tip 8 has a blade tip clearance, and the blade 3 is matched with the current collector 1 for use.

In this embodiment, the current collector 1 parameter Φ, θ, and the current collector 1 parameter Φ= (10 °), θ= (0 °) are preferably further included.

In this embodiment, preferably, inlet 11 diameter/throat 12 diameter/outlet-13 diameter= (1.2)/(1)/(1.2).

In this embodiment, the cross-sectional heights H1, H2, H3 are preferably further included, and the heights of the cross-sections of the current collector 1 are: h1/h2/h3= (1)/(0)/(1).

In this embodiment, it is preferable to further include a first gap δ 1, a butt gap δ 2, and a mating gap δ 3, wherein the first gap δ 1= (0.0075) ×d2 of the partial blade 3 with gap and the current collector 1, and the gap ensures that the blade and the current collector will not rub; a gap sigma 2= (0.0075) x d2 between the step opening of the current collector 1 and the wheel cover 2 is in butt joint, and the gap ensures that the inlet position of the wheel cover 2 and the current collector 1 cannot rub; the outlet section of the collector 1 engages with the shroud 2 by a clearance δ3= (0.0075) ×d2 which ensures that the upper surface of the shroud 2 does not rub against the collector 1.

In this embodiment, preferably, the blade 3 is a three-element airfoil structure, which adopts a forward bending and backward sweeping design, the inlet angle is basically unchanged and the outlet angle is gradually reduced along the blade height direction, so that the fan has better aerodynamic performance, and the blade 3 comprises a blade top 8, a tail edge 31, a blade top chord line 32, a front edge 34 and a blade root 35, and the blade 3 with a part of clearance occupies a chord length proportion range L2/l1=1/3.

In this embodiment, the section of the molded line of the wheel disc 4 near the motor 5 is preferably a straight curve, and in the outlet section, the section is downward, so as to increase the outlet pressure of the fan.

The novel backward centrifugal fan can also be sleeved with the impeller, as shown in fig. 7, so that the air flow can be ensured to uniformly enter the impeller, and the flow loss is reduced.

A novel centrifugal fan impeller comprises a blade 3 with a gap, a wheel cover 2 and a wheel disc 4.

Through simulation calculation, the impeller height is reduced by 8.1%, the air quantity is improved by 5.6%, the rotating speed is reduced by 5.2% under the ventilation quantity, the predicted noise is reduced by 2-3 dB (A), and the fan performance is increased.

Example 2

Example 2 is substantially the same as example 1, with the following differences:

current collector 1 parameter Φ= (40 °), θ= (30 °);

inlet 11 diameter/throat 12 diameter/outlet-13 diameter= (2.1)/(1.5)/(3.6);

H1/H2/H3＝(2)/(2)/(1.5)；

a first gap σ1= (0.01125) ×d2; dock clearance, σ2= (0.00875) ×d2; fit clearance σ3= (0.01125) ×d2;

L2/L1＝5/12。

example 3

Example 3 is substantially the same as example 1, with the following differences:

current collector 1 parameter Φ= (70 °), θ= (60 °);

inlet 11 diameter/throat 12 diameter/outlet-13 diameter= (3)/(2)/(6);

H1/H2/H3＝(3)/(4)/(2)；

first gap σ1= (0.015) ×d2; dock clearance σ2= (0.01) ×d2; fit clearance σ3= (0.015) ×d2;

L2/L1＝1/2。

the working principle and the using flow of the utility model are as follows: part of the blade top 8 is fixedly connected with the wheel cover 2 or is wholly fixedly connected with the wheel cover, and the other part of the blade top is in clearance fit or gapless fit with the current collector 1, and the current collector 1 is sleeved outside or sleeved inside.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A novel centrifugal fan, its characterized in that: comprises a current collector (1), a wheel cover (2), blades (3), a wheel disc (4) and a motor (5), wherein the wheel disc (4) is fixedly connected with the motor (5), the blades (3) are fixedly connected with the wheel disc (4), the top of the blade (3) is provided with a blade top (8), one part of the blade top (8) is connected with the wheel cover (2), and the other part of the blade top (8) is matched with the current collector (1);

the collector (1) comprises an inlet (11), a throat part (12), a first outlet (13) and a second outlet (14), wherein stepped sections are arranged on the inner surface of the collector (1) at the section of the first outlet (13) and the section of the second outlet (14), and the outlet part of the collector (1) is consistent with the molded line of the wheel cover (2);

the blade tip (8) is provided with a blade tip clearance.

2. The novel centrifugal fan according to claim 1, wherein: the device also comprises parameters phi and theta of the current collector (1), wherein the parameter phi= (10-70 degrees) of the current collector (1), and the parameter theta= (0-60 degrees) of the current collector.

3. The novel centrifugal fan according to claim 1, wherein: the inlet (11) diameter/throat (12) diameter/outlet one (13) diameter= (1.2-3)/(1-2)/(1.2-6).

4. The novel centrifugal fan according to claim 1, wherein: the heat collector also comprises section heights H1, H2 and H3, wherein the section heights of the current collector (1) are as follows: h1/H2/h3= (1-3)/(0-4)/(1-2).

5. The novel centrifugal fan according to claim 1, wherein: the device also comprises a first gap (Sigma 1), a butt joint gap (Sigma 2) and a fit gap (Sigma 3), wherein the first gap (Sigma 1) = (0.0075-0.015) multiplied by d2; butt gap (sigma 2) = (0.0075-0.01) ×d2; fit clearance (sigma 3) = (0.0075-0.015) ×d2.

6. The novel centrifugal fan according to claim 1, wherein: the blade (3) is of a ternary airfoil structure, and the blade (3) comprises a blade tip (8), a tail edge (31), a blade tip chord line (32), a front edge (34) and a blade root (35).

7. The novel centrifugal fan according to claim 1, wherein: the part of the molded line of the wheel disc (4) close to the motor (5) is a straight curve, and the section molded line is downward at the outlet part.

8. A novel centrifugal fan impeller comprising the gapped blade (3), the shroud (2) and the wheel disc (4) of the centrifugal fan according to any one of claims 1 to 7.