CN217502078U

CN217502078U - Arc-shaped head blade and centrifugal ventilator thereof

Info

Publication number: CN217502078U
Application number: CN202121612800.0U
Authority: CN
Inventors: 裘鑫; 徐天赐
Original assignee: Zhejiang Kemao Intelligent Electromechanical Co ltd
Current assignee: Zhejiang Kemao Intelligent Electromechanical Co ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2022-09-27
Anticipated expiration: 2031-07-15

Abstract

The utility model relates to an arc head blade and centrifugal fan thereof, including the back plate, the back plate side is equipped with the front bezel, the back plate with fixed a plurality of blades that are equipped with between the front bezel, it is a plurality of the equidistant range of blade circumference sets up, blade head shape is the camber line, the utility model discloses a key lies in improving to centrifugal fan impeller blade's entry head shape-will wait thickness arc blade's entry edge sharp-pointed right angle limit to improve to glossy camber line shape, increases the circulation area that the air current got into the blade way and weakens the impact of blade import department air current to optimize impeller blade entry and even the mobile state in the passageway between the blade, improve the efficiency of impeller to the air current acting and the ability of doing work, and then improve the pneumatic performance of ventilation blower and reduce power consumption and the noise that reduces the ventilation blower.

Description

Arc-shaped head blade and centrifugal ventilator thereof

Technical Field

The utility model relates to a ventilation blower field especially relates to an arc head blade and centrifugal fan thereof.

Background

The installation angle of a blade inlet of an impeller of the centrifugal fan is designed and determined according to a certain target flow, the fan cannot always operate under the working condition of the flow, and when the relative speed direction angle of airflow entering a blade channel is inconsistent with the installation angle of the blade at the position, an attack angle is generated, namely the airflow enters the impeller in an impacting manner, so that the flow state of the inlet of the blade channel is deteriorated, the efficiency and the capacity of the impeller for applying work to the air are reduced, and impact noise is generated; in the actual impeller of the ventilator, the number of the blades is limited, the blades have certain thickness, the flow area of the blade channel is reduced, and the radial speed of the airflow entering the blade channel is increased, so that the speed triangle of the inlet airflow is changed, the relative speed of the airflow in the blade channel is increased, and the flow loss of the inlet is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an arc head blade and centrifugal fan thereof solves above-mentioned problem.

The utility model discloses a following technical scheme realizes above-mentioned purpose: a blade with an arc-shaped head and a centrifugal ventilator thereof comprise a rear disc, wherein a front disc is arranged beside the rear disc, a plurality of blades are fixedly arranged between the rear disc and the front disc, the plurality of blades are arranged at equal intervals on the circumference, and the head of each blade is arc-shaped;

preferably, the blade has the same thickness except the head.

As the utility model discloses an prefer, blade thickness is t, blade head radius is r ₀ The above-mentioned

Preferably, the blade head arc is one or more of a semi-circle, a semi-ellipse and other arcs.

As the utility model discloses an prefer, the head pitch arc on working face and the non-working face both sides of blade can be symmetrical setting or asymmetric setting for blade thickness central line.

As the utility model discloses a preferred, use panel as the raw materials the blade is processed the head into the camber through specific manufacturing process, then with the back plate with the welding of preceding dish is in the same place.

As a preference of the present invention, the blade head is directly formed into a smooth arc shape for the integrally formed impeller.

As the utility model discloses a preferred, the blade head can reduce for smooth arc line shape blade entrance thickness increases blade entrance flow area reduces the air current and blocks up.

Preferably, the blade head is smooth arc-shaped to adapt to different air inlet angles.

As the utility model discloses a preferred, the blade head can reduce the impact when the air current gets into the blade passageway and the noise that brings for smooth arc form, improves impeller work efficiency and aerodynamic performance.

Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model discloses a key lies in improving the entry head shape of backward centrifugal fan impeller blade-will wait thickness arc blade's entry edge sharp-pointed right angle limit to improve to glossy arc line shape, increase the air current and get into the through flow area of blade way and weaken the impact of blade import department air current to optimize impeller blade entry and even the mobile state in the passageway between the blade, improve the efficiency of impeller to the air current acting and the ability of doing work, and then improve the pneumatic performance of ventilation blower and reduce power consumption and the noise that reduces the ventilation blower.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1 according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the part B of FIG. 1 according to the embodiment of the present invention;

fig. 4 is an external schematic view of a centrifugal ventilator according to an embodiment of the present invention;

FIG. 5 is a schematic diagram showing a static pressure comparison curve between the second embodiment of the present invention and the second comparative sample machine;

fig. 6 is a schematic diagram of a comparison curve of the static pressure efficiency of the second embodiment of the present invention and the second comparison sample machine.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

an arc-shaped head blade and a centrifugal ventilator thereof are disclosed, as shown in fig. 1-6, comprising a rear disk 12, a front disk 13 is arranged beside the rear disk 12, a plurality of blades 11 are fixedly arranged in front of the rear disk 12 and the front disk 13, the plurality of blades 11 are arranged at equal intervals on the circumference, and the head of each blade 11 is arc-shaped;

further, the blade 11 has the same thickness except for the head.

Further, the thickness of the blade 11 is t, and the radius of the head of the blade 11 is r ₀ Said

Further, the arc line of the head of the blade 11 is one or more of a semi-circle, a semi-ellipse and other arc lines.

Further, the head arcs of the working surface and the non-working surface of the blade 11 may be symmetrically or asymmetrically arranged relative to the thickness center line of the blade.

Further, the blade 11, which is made of a plate material, is processed into an arc shape by a specific processing technique, and then is welded to the rear disk 12 and the front disk 13.

Further, for the impeller formed integrally, the head of the blade 11 is directly set to be in a smooth arc shape.

Furthermore, the head of the blade 11 is smooth arc-shaped, so that the thickness of the inlet of the blade 11 can be reduced, the flow area of the inlet of the blade 11 is increased, and airflow blockage is reduced.

Further, the smooth arc shape of the head of the blade 11 can adapt to different air flow inlet angles.

Furthermore, the head of the blade 11 is smooth arc-shaped, so that the impact and noise caused by the impact when the airflow enters the blade channel can be reduced, and the work efficiency and the pneumatic performance of the impeller are improved.

In use, the test was carried out in groups of five comparative prototypes and examples, the dimensions remaining identical except for the different shapes of the inlet edges of the blades, the main dimensions of the blades of the five examples and their comparative prototypes being shown in FIG. 3 and in the following table:

the main performance parameters of the five examples and their comparative prototypes under the highest efficiency working condition are compared as shown in the following table:

the performance curves of the second embodiment and the second comparative sample are compared (as shown in fig. 5-6), and it can be seen from the comparison graph that in the main operation region of the ventilator, the static pressure of the fan adopting the blades with the circular arc head parts is higher than that of the conventional fan under the condition of the same flow rate, and the static pressure efficiency is obviously improved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides an arc head blade and centrifugal fan thereof, its characterized in that, includes the back plate, the back plate side is equipped with the preceding dish, the back plate with fixed a plurality of blades that are equipped with between the preceding dish to panel is the raw materials the blade is processed into the arc shape with the head, with the back plate with preceding dish welding is as an organic whole, and is a plurality of the equidistant range of blade circumference sets up, blade head shape is the arc shape.

2. An arc-shaped head blade and a centrifugal fan thereof according to claim 1, wherein the blade is equal in thickness except for the head portion.

3. An arc-shaped head blade and a centrifugal fan thereof according to claim 2, wherein the blade has a thickness t and a radius of the head portion of the blade is

Said

。

4. The cambered-head blade and the centrifugal fan thereof as claimed in claim 3, wherein the camber line of the head of the blade is one or more of a semi-circle and a semi-ellipse.

5. An arc-shaped head blade and a centrifugal fan thereof according to claim 4, wherein the head arcs of both sides of the working surface and the non-working surface of the blade are symmetrically arranged relative to the thickness center line of the blade; or the like, or, alternatively,

the head arcs on both sides of the working surface and the non-working surface of the blade are asymmetrically arranged relative to the thickness center line of the blade.

6. A centrifugal fan comprising a fan blade having an arcuate head as defined in claim 5, wherein the blade head is formed in a smooth arcuate shape directly to the impeller wheel.

7. An arcuate-head vane and centrifugal fan as claimed in claim 6 wherein the vane inlet is of reduced thickness.

8. An arcuate-nose vane and centrifugal fan as claimed in claim 7 wherein the vane nose is smoothly arcuate to accommodate different air flow inlet angles.