CN213574810U - Centrifugal impeller - Google Patents

Abstract

The utility model discloses a centrifugal impeller, including wind wheel and a plurality of blades of installing on the wind wheel of encircleing, its characterized in that: phi D1 is the effective outer diameter of the wind wheel, phi D2 is the diameter of the midpoint of the chord length of the wind wheel, phi D3 is the diameter of the inner diameter of the wind wheel, a is the installation angle of the blade, b is the intersection angle of the pressure surface of the blade; A. b, C are respectively the end point, the middle point and the starting point of the chord length of the pressure surface of the blade; wherein the following are satisfied:

a is more than or equal to 20 degrees and less than or equal to 30 degrees; b is more than or equal to a +15 degrees and less than or equal to a +20 degrees; and the ratio of the arc AB to the arc BC meets the following requirements:

the blade profile can inhibit the influence of outlet vortex under the action of meeting the strength by reducing the width of the outlet; finally, the novel impeller is realized to improve the flow efficiency and improve the flow.

Description

Centrifugal impeller

Technical Field

The utility model relates to a fan, in particular to centrifugal impeller.

Background

The existing centrifugal fan has the advantages that due to the blade-shaped design of the blades, airflow directly acts on the wall surfaces of the blades at the inlet of an impeller of the existing centrifugal fan, larger impact reflection occurs, airflow separation easily occurs at the inlet, strong vortex is formed, the action of the airflow in a blade channel is expanded, backflow is formed, and larger flow loss is caused.

SUMMERY OF THE UTILITY MODEL

The present invention aims to solve at least one of the above-mentioned technical problems in the related art to a certain extent. Therefore, the utility model provides a centrifugal impeller can effectively improve the amount of wind.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

according to the utility model discloses a centrifugal impeller of first aspect embodiment, including wind wheel and a plurality of surrounding installation the blade on the wind wheel, Φ D1 is the effective external diameter of wind wheel, Φ D2 is the chord length midpoint diameter of wind wheel, Φ D3 is the internal diameter of wind wheel, a blade installation angle, b blade pressure face angle of intersection; A. b, C are respectively the chord length end point, the chord length midpoint and the chord length starting point of the pressure surface of the blade;

wherein the following are satisfied:

20°≤a≤30°；

a+15°≤b≤a+20°；

and the ratio of the arc AB to the arc BC meets the following requirements:

according to the utility model discloses centrifugal impeller has following beneficial effect at least: the blade profile can inhibit the influence of outlet vortex under the action of meeting the strength by reducing the width of the outlet; finally, the novel impeller is realized to improve the flow efficiency and improve the flow.

According to the utility model discloses a some embodiments, two-layer distribution of encircleing about the wind wheel sets up the blade, and upper and lower two-layer dislocation distribution between the blade.

According to the utility model discloses a some embodiments, the wind wheel middle part is equipped with the connecting portion of connecting in the motor, connecting portion are two-layer about being located between the blade.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the blade structure of the present invention;

fig. 3 is another schematic view of the present invention.

Reference numerals: a wind wheel 100; a blade 200; a connecting portion 300.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 and 2, a centrifugal impeller comprises a wind wheel 100 and a plurality of blades 200 arranged on the wind wheel 100 in a surrounding manner, wherein Φ D1 is the effective outer diameter of the wind wheel 100, Φ D2 is the diameter of the midpoint of the chord length of the wind wheel 100, Φ D3 is the diameter of the inner diameter of the wind wheel 100, a is the installation angle of the blades 200, and b is the intersection angle of the pressure surfaces of the blades 200; A. b, C are respectively the end point, the middle point and the starting point of the chord length of the pressure surface of the blade 200; wherein the following are satisfied:

20°≤a≤30°；

a+15°≤b≤a+20°；

and the ratio of the arc AB to the arc BC meets the following requirements:

the utility model discloses a blade 200, its blade profile is in import department through control blade 200 installation angle an and blade 200 pressure surface crossing angle b, and the contact of increase fillet and air current gives the bigger angle of prewhirl of air current, weakens the air current direct action in blade 200's impact loss. And the intersection angle b of the installation angle a of the blade 200 and the pressure surface of the blade 200 is improved, so that the area of the inlet fluid is increased, the improved acceleration coefficient is weakened, and the flow efficiency at the inlet of the blade 200 is improved. After the airflow enters the blade channel between the blades 200, the airflow performs the motion of firstly decelerating and then accelerating in the blade channel under the action of the traction speed and the relative speed, and the blade profile respectively represents the decelerating and accelerating flowing states in the blade channel by performing the partition arc AB and the arc BC on the profile. The area proportion of the arc AB in accelerated motion is improved, so that the acceleration stroke of the airflow is longer after the airflow passes through the blade channel, the full pressure of the airflow at the outlet is larger, and the flow is larger. A typical vortex exists at the exit of the vane 200 due to the thickness of the vane 200. After passing through the acceleration process of the impeller, the airflow flows out along the pressure surface, and the airflow is separated between the pressure surface and the back pressure surface under the solid action of the blades 200. In this separation region, the flow spreads from the high pressure region on both sides to the low pressure region, eventually mixing the two-sided vane flow, resulting in flow losses. The blade profile can inhibit the influence of outlet vortex under the action of meeting the strength by reducing the width of the outlet; finally, the novel impeller is realized to improve the flow efficiency and improve the flow.

As shown in table 1, comparative experimental data for the present centrifugal impeller and the conventional impeller:

compared with the conventional impeller, the centrifugal impeller generates larger air volume under the condition of low rotating speed and consumes less energy.

In some embodiments of the present invention, the wind wheel 100 is provided with upper and lower layers of blades 200 distributed around the wind wheel, and the upper and lower layers of blades 200 are distributed in a staggered manner. As shown in fig. 1, two layers of blades 200 are arranged on the wind wheel 100, and the blades 200 in the two layers are staggered from each other in the up-down position, so that the air volume of the wind wheel 100 is effectively further improved in the using process.

As shown in fig. 3, in some embodiments of the present invention, the middle of the wind wheel 100 is provided with a connecting portion 300 connected to the motor, and the connecting portion 300 is located between the upper and lower blades 200, so that the impeller forms two wind zones and the total wind volume is increased.

In the description herein, references to the description of "some specific embodiments" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (3)

1. A centrifugal impeller comprising a rotor (100) and a plurality of blades (200) circumferentially mounted on said rotor (100), characterized in that: phi D1 is the effective outer diameter of the wind wheel (100), phi D2 is the diameter of the midpoint of the chord length of the wind wheel (100), phi D3 is the diameter of the inner diameter of the wind wheel (100), a is the installation angle of the blade (200), b is the intersection angle of the pressure surfaces of the blades (200); A. b, C are respectively the chord length end point, the chord length midpoint and the chord length starting point of the pressure surface of the blade (200);

wherein the following are satisfied:

20°≤a≤30°；

a+15°≤b≤a+20°；

and the ratio of the arc AB to the arc BC meets the following requirements:

2. the centrifugal impeller of claim 1, wherein: the wind wheel (100) is provided with an upper layer and a lower layer which are distributed around the blades (200), and the upper layer and the lower layer are distributed between the blades (200) in a staggered manner.

3. The centrifugal impeller of claim 2, wherein: the wind wheel (100) middle part is equipped with connecting portion (300) of connecting in the motor, connecting portion (300) are located upper and lower two-layer between blade (200).

Images