CN110185640B

CN110185640B - Centrifugal fan and household appliance

Info

Publication number: CN110185640B
Application number: CN201910515600.4A
Authority: CN
Inventors: 李军华; 王泽钦; 江名松; 罗国枢; 陈章成; 周列玉; 张士横
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2021-07-27
Anticipated expiration: 2039-06-14
Also published as: CN110185640A

Abstract

The invention provides a centrifugal fan and a household appliance. The centrifugal fan comprises a volute, wherein a fan wheel is arranged in an inner cavity of the volute, a volute tongue is arranged on one side of the volute, which faces the fan wheel, the wall body of the inner cavity of the volute forms an air channel of the centrifugal fan, a plane which is perpendicular to the axial direction of the fan wheel is defined as a first plane, the projection is carried out on the first plane, the air channel forms an air channel molded line, the air channel molded line comprises an arc section, the arc section extends from the volute tongue along the rotation direction of the fan wheel, and the arc section is concentric with the fan wheel. According to the centrifugal fan and the household appliance, the resistance capability of the centrifugal fan can be effectively improved, the operation noise of the centrifugal fan is reduced, and the product performance is improved.

Description

Centrifugal fan and household appliance

Technical Field

The invention belongs to the technical field of centrifugal fans, and particularly relates to a centrifugal fan and a household appliance.

Background

The centrifugal fan is one of three main air duct components, has the advantage of larger air volume compared with an axial flow fan and a cross flow fan, is widely applied to an air purifier, a mobile air conditioner and a dehumidifier on the basis of the advantage, but has larger aerodynamic noise generated during operation, so that the operation noise of the centrifugal fan can be effectively reduced to become an important breakthrough point for improving the product performance, and the invention is provided on the basis of the breakthrough point.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to provide a centrifugal fan and a household appliance, which can effectively improve the resistance of the centrifugal fan, reduce the operation noise of the centrifugal fan and improve the product performance.

In order to solve the above problems, the present invention provides a centrifugal fan, including a volute, wherein a fan wheel is installed in an inner cavity of the volute, a volute tongue is provided at one side of the volute facing the fan wheel, a wall of the inner cavity of the volute forms an air duct of the centrifugal fan, a plane perpendicular to an axial direction of the fan wheel is defined as a first plane, the air duct forms an air duct profile projected on the first plane, the air duct profile includes an arc section, the arc section extends from the volute tongue along a rotation direction of the fan wheel, and the arc section is concentric with the fan wheel.

Preferably, the circular arc section corresponds to a circular angle A, and A is more than or equal to 15 degrees and less than or equal to 20 degrees.

Preferably, the diameter of the circular arc section is D, the maximum outer diameter of the wind impeller is D, and D-D is more than or equal to 8mm and less than or equal to 20 mm.

Preferably, the air duct has an air outlet, and projects on the first plane, the air duct profile further includes a first tangential section and a second tangential section which are located on the tangential direction of the wind impeller, the first tangential section is parallel to the second tangential section, the distance between the first tangential section and the axis of the wind impeller is greater than the distance between the second tangential section and the wind impeller, in the air outlet direction, the second tangential section is located at the downstream of the first tangential section, and two adjacent ends of the first tangential section and the second tangential section are connected through a transition section.

Preferably, the transition section is a straight section, an included angle B is formed between the straight section and the first tangential section, and B is more than or equal to 15 degrees and less than or equal to 30 degrees.

Preferably, the junction of the transition section and the first tangential section is a smooth arc, and/or the junction of the transition section and the second tangential section is a smooth arc.

Preferably, the blades of the wind impeller are forward blades.

The invention also provides a household appliance comprising the centrifugal fan.

Preferably, the household appliance is any one of an air purifier, an air conditioner and a dehumidifier.

According to the centrifugal fan and the household appliance, the air duct molded line at the volute tongue comprises the arc section which is concentrically arranged with the wind impeller, and the point at the position closest to the wind impeller from the original volute tongue is improved into the concentrically arranged arc line, so that the air flow can be better guided, the effect of the flying cone is exerted, the resistance of the air duct is obviously improved, the stability of the air flow is stronger, and the operation noise of the centrifugal fan is greatly reduced.

Drawings

FIG. 1 is an exploded view of a centrifugal fan according to an embodiment of the present invention;

FIG. 2 is a schematic view of the internal structure of the centrifugal fan of FIG. 1;

fig. 3 is a schematic view of the structure of the fan wheel of fig. 1.

The reference numerals are represented as:

1. a volute; 11. a volute tongue; 12. an air duct profile; 121. a circular arc section; 122. a first tangential section; 123. a second tangential section; 124. a transition section; 13. an air outlet; 2. a wind impeller; 21. a blade; 3. an electric motor.

Detailed Description

With reference to fig. 1 to 3, according to an embodiment of the present invention, a centrifugal fan is provided, and includes a volute 1, a wind impeller 2 is installed in an inner cavity of the volute 1, the wind impeller 2 is driven by a motor 3 to rotate, a volute tongue 11 is provided at a side of the volute 1 facing the wind impeller 2, a wall of the inner cavity of the volute 1 forms a wind channel of the centrifugal fan, a plane perpendicular to an axial direction of the wind impeller 2 is defined as a first plane, and in projection on the first plane, the wind channel forms a wind channel profile 12, the wind channel profile 12 includes an arc segment 121, the arc segment 121 extends from the position of the volute tongue 11 along a rotation direction of the wind impeller 2, and the arc segment 121 is concentric with the wind impeller 2. In the technical scheme, the air duct molded line 12 at the volute tongue 11 comprises the arc section 121, the arc section 121 and the wind impeller 2 are concentrically arranged, and the point at the position closest to the wind impeller from the original volute tongue is improved into the concentrically arranged arc line, so that the air flow can be better guided, the effect of a flying cone is exerted, the resistance of the air duct is obviously improved, the stability of the air flow is stronger, and the operation noise of the centrifugal fan is greatly reduced. It is understood that the arc segment 121 is an arc segment with the same curvature radius taken on the same circle.

Furthermore, the circular angle corresponding to the circular arc section 121 is a, a is more than or equal to 15 degrees and less than or equal to 20 degrees, and the span of the circular arc section 121 is reasonably limited by adopting the technical scheme, so that the resistance of the centrifugal air duct can be further improved, the air volume is increased, and the running noise is further reduced.

Furthermore, the diameter of the arc section 121 is D, the maximum outer diameter of the wind impeller 2 is D, D-D is larger than or equal to 8mm and smaller than or equal to 20mm, that is, the distance between the arc section 121 and the wind impeller 2 is reasonably limited, so that the problems that the drainage is not smooth due to too small clearance and the volute tongue is not obvious due to too large clearance are prevented.

In order to further reduce the operating noise of the centrifugal fan, preferably, the air duct has an air outlet 13, and the air duct profile 12 further includes a first tangential section 122 and a second tangential section 123 that are located in a tangential direction of the wind impeller 2, the first tangential section 122 is parallel to the second tangential section 123, a distance between the first tangential section 122 and an axial center of the wind impeller 2 is greater than a distance between the second tangential section 123 and the wind impeller 2, in an air outlet direction, the second tangential section 123 is located downstream of the first tangential section 122, and two adjacent ends of the first tangential section 122 and the second tangential section 123 are connected by a transition section 124. In the technical scheme, the air outlet 13 is of a variable cross-section structure and a throat structure, and the throat structure guides the outflow direction of the airflow by using the transition section 124, so that the air outlet airflow can be effectively prevented from generating turbulence at the air outlet 13 to induce operation noise; furthermore, because the air outlet in the technical scheme is of a necking structure, throttling pressurization is formed on the air outlet flow, and the overflowing distance of the air outlet flow outside the electric appliance can be prolonged. Preferably, the transition section 124 is a straight line section, and an included angle B is formed between the straight line section and the first tangential section 122, wherein B is more than or equal to 15 degrees and less than or equal to 30 degrees.

Preferably, the junction of the transition segment 124 and the first tangential segment 122 is a rounded arc, and/or the junction of the transition segment 124 and the second tangential segment 123 is a rounded arc. In the technical scheme, the part of the transition section 124, which is compared with the first tangential section 122 or the second tangential section 123, is subjected to smooth processing, so that the resistance of the profile line sudden change to the outlet airflow can be obviously reduced.

In order to further increase the air volume of the centrifugal fan, preferably, the blades 21 of the wind impeller 2 are forward blades, where the forward blades are as shown in fig. 3, a tip (an end far away from the axial center of the wind impeller 2) of each blade 21 faces a downstream side of the rotation direction of the wind impeller 2, that is, the blades 21 face the same direction as the rotation direction of the wind impeller 2, and more specifically, a projection of a tip extending direction of each blade 21 and a tangential direction of the wind impeller 2 on the first plane forms an included angle C, where 90 ° < C < 180 °.

In order to fully verify the technical effects of the technical solution of the present invention, the diameter of the impeller 2 is determined to be 210mm, the diameter of the arc segment 121 is 220mm, a is 20 °, B is 25 °, and C is 130 °, the centrifugal fan is installed in an air purifier having multiple layers of filter screens, and the air purifier is operated to perform test tests on the noise level and the air volume of the air purifier, so as to obtain the data in tables 1 and 2.

TABLE 1

TABLE 2

According to the experimental results of noise tests shown in the table 1, the lowest noise of the air purifier using the centrifugal fan is 37.7dB, and is reduced by 2dB compared with the lowest noise level of the existing air purifier;

according to the air volume test result table 2, the air purifier using the centrifugal fan provided by the invention has the advantages that the resistance capacity is obviously improved, when the static pressure is less than 50Pa, the filter screen is installed and removed, the air volume is basically unchanged, the resistance capacity is good, the air volume is high, when the air purifier operates under the same working condition, the air volume level is higher than that of the existing product, and under the condition of the same air volume, the noise is lower.

The centrifugal fan can also be used in other household appliances with severe requirements on air quantity and noise, such as any one of an air conditioner, particularly a mobile air conditioner and a dehumidifier.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A centrifugal fan comprises a volute (1), wherein a fan impeller (2) is arranged in an inner cavity of the volute (1), and a volute tongue (11) is arranged on one side of the volute (1) facing the fan impeller (2), and is characterized in that an air duct of the centrifugal fan is formed by the wall body of the inner cavity of the volute (1), a plane which is arbitrarily perpendicular to the axial direction of the fan impeller (2) is defined as a first plane, the air duct forms an air duct molded line (12) in projection on the first plane, the air duct molded line (12) comprises an arc section (121), the arc section (121) extends from the volute tongue (11) along the rotation direction of the fan impeller (2), and the arc section (121) is concentric with the fan impeller (2); the circular angle corresponding to the circular arc section (121) is A, and A is more than or equal to 15 degrees and less than or equal to 20 degrees; the diameter of the circular arc section (121) is D, the maximum outer diameter of the wind impeller (2) is D, and D-D is larger than or equal to 8mm and smaller than or equal to 20 mm.

2. The centrifugal fan according to claim 1, wherein the air duct has an air outlet (13), and in projection on the first plane, the air duct profile (12) further includes a first tangential section (122) and a second tangential section (123) at a tangential direction of the wind impeller (2), the first tangential section (122) and the second tangential section (123) are parallel, and a distance between the first tangential section (122) and an axial center of the wind impeller (2) is greater than a distance between the second tangential section (123) and the wind impeller (2), and in an air outlet direction, the second tangential section (123) is located downstream of the first tangential section (122), and two adjacent ends of the first tangential section (122) and the second tangential section (123) are connected by a transition section (124).

3. The centrifugal fan according to claim 2, wherein the transition section (124) is a straight line section having an angle B with the first tangential section (122) of 15 ° ≦ B ≦ 30 °.

4. The centrifugal fan according to claim 3, wherein the junction of the transition section (124) and the first tangential section (122) is a rounded arc and/or the junction of the transition section (124) and the second tangential section (123) is a rounded arc.

5. The centrifugal fan according to any of the claims 1-4, wherein the blades (21) of the fan wheel (2) are forward blades.

6. Household appliance comprising a centrifugal fan, characterized in that said centrifugal fan is a centrifugal fan according to any one of claims 1 to 5.

7. The household appliance according to claim 6, wherein the household appliance is any one of an air purifier, an air conditioner and a dehumidifier.