CN108412807B

CN108412807B - Volute, fan assembly and air conditioner

Info

Publication number: CN108412807B
Application number: CN201810289084.3A
Authority: CN
Inventors: 刘雷明; 何振健; 冯青龙; 陈姣; 秦晓柯; 王千千; 赵毓斌
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2018-04-03
Filing date: 2018-04-03
Publication date: 2023-08-15
Anticipated expiration: 2038-04-03
Also published as: CN108412807A

Abstract

The application provides a volute, a fan assembly and an air conditioner. The volute comprises a volute throat (1), the wall surface of an air channel where the volute throat (1) is located is a first wall surface (2), a boss (3) protruding out of the first wall surface (2) is arranged on the first wall surface (2), the boss (3) extends from the volute throat (1) along the airflow flowing direction, the width of the boss (3) along the axial direction of the volute is a first width, the width of the first wall surface (2) along the axial direction of the volute is a second width, and the first width is smaller than the second width. According to the volute, turbulent kinetic energy of air flow can be reduced, and the noise reduction effect is good.

Description

Volute, fan assembly and air conditioner

Technical Field

The application belongs to the technical field of air conditioning, and particularly relates to a volute, a fan assembly and an air conditioner.

Background

At present, the noise problem of the air conditioner is more and more emphasized in the development process of the household air conditioner, and the main source of the noise of the air conditioner is a cross flow fan of the internal machine. Therefore, reducing air conditioning noise, developing lower noise air conditioners requires starting with developing low noise cross flow fans. However, the air quantity and the noise of the cross-flow fan are two parameters closely related, and the noise of the existing air conditioner cannot be well controlled when the air quantity is improved.

Disclosure of Invention

Therefore, the technical problem to be solved by the application is to provide the volute, the fan assembly and the air conditioner, which can reduce turbulent kinetic energy of air flow and have better noise reduction effect.

In order to solve the above problems, the present application provides a volute, which includes a volute portion, wherein a wall surface of an air channel where the volute portion is located is a first wall surface, a boss protruding from the first wall surface is disposed on the first wall surface, the boss extends from the volute portion along a flow direction of an air flow, a width of the boss along an axial direction of the volute is a first width, a width of the first wall surface along the axial direction of the volute is a second width, and the first width is smaller than the second width.

Preferably, along the axial direction of the scroll casing, a predetermined interval is provided between the first side edge of the boss and the first side edge of the first wall surface, and a predetermined interval is provided between the second side edge of the boss and the second side edge of the first wall surface.

Preferably, the boss is provided with a first guiding inclined plane at one side close to the worm throat, and the first guiding inclined plane extends from the top surface of the boss far away from the first wall surface to the first wall surface; and/or, one side of the boss far away from the worm throat is provided with a second guide inclined surface, and the second guide inclined surface extends from the top surface of the boss far away from the first wall surface to the first wall surface.

Preferably, the first wall surface comprises a curved surface section and a plane section, the curved surface section and the plane section are sequentially arranged along the airflow flowing direction, and the boss is arranged on the curved surface section.

Preferably, the first guiding inclined plane is a plane, a concave cambered surface or a convex cambered surface; and/or the second guiding inclined plane is a plane, a concave cambered surface or a convex cambered surface.

Preferably, when the first guiding inclined surface is a plane, an included angle between the first guiding inclined surface and the first wall surface is 10 ° to 15 °; and/or, when the second guiding inclined plane is a plane, the included angle between the second guiding inclined plane and the first wall surface is 10 degrees to 15 degrees.

Preferably, the first guide slope extends from the throat portion in a direction away from the boss; and/or, the second guiding inclined surface extends from the top surface of the boss to the intersection position of the curved surface section and the plane section.

Preferably, the boss has a uniform cross-sectional structure along the flow direction of the air flow.

Preferably, the cross section of the boss is rectangular or trapezoidal.

Preferably, when the cross section of the boss is rectangular, the width of the boss is 9 to 11mm and the height of the boss protruding from the first wall surface is 0.9 to 1.1mm in the cross section of the boss.

Preferably, the boss protrudes from the first wall surface to have a uniform height, and the cross-sectional area of the boss decreases along the flow direction of the air flow.

Preferably, the plurality of bosses are arranged at intervals along the axial direction of the volute.

According to yet another aspect of the present application, there is provided a fan assembly comprising a fan and the volute described above, the fan being disposed within the volute.

Preferably, the fan is a cross-flow fan, the cross-flow fan comprises a plurality of cross-flow fan blades which are sequentially connected along the axial direction, a plurality of bosses are arranged at intervals along the axial direction of the cross-flow fan, and the bosses are arranged in one-to-one correspondence with the plurality of cross-flow fan blades.

Preferably, the boss is disposed corresponding to the middle position of the corresponding throttle blade.

According to still another aspect of the present application, there is provided an air conditioner including a blower and the above-described scroll casing, in which the blower is disposed.

The volute provided by the application comprises a volute throat, wherein the wall surface of an air channel where the volute throat is located is a first wall surface, a boss protruding out of the first wall surface is arranged on the first wall surface, the boss extends from the volute throat along the airflow flowing direction, the width of the boss along the axial direction of the volute is a first width, the width of the first wall surface along the axial direction of the volute is a second width, and the first width is smaller than the second width. The volute forms a boss protruding out of the wall surface on the wall surface of the air channel where the volute throat is located, and the width of the boss is smaller than that of the first wall surface, so that high-low dislocation can be formed between the boss and the wall surface where the volute throat is located in the axial direction of the volute, pressure fluctuation of airflow incoming flow on the wall surface where the volute throat is located forms wrong-phase excitation, when airflow pulsation continuously and periodically impacts the wall surface of the air channel, the uneven surface can enable periodic impact of airflow not to occur at the same time point, pressure pulses are not at the same frequency point, noise can be discretized, turbulent energy of airflow flowing is reduced, and airflow noise is reduced.

Drawings

Fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present application;

FIG. 2 is an enlarged schematic view of the structure at L of FIG. 1;

fig. 3 is a schematic structural view of a scroll casing of an air conditioner according to an embodiment of the present application;

fig. 4 is a schematic perspective view of a scroll casing of an air conditioner according to an embodiment of the present application;

fig. 5 is a schematic structural view of a boss of a volute of an air conditioner according to an embodiment of the present application;

FIG. 6 is a simulated turbulence energy diagram of an air duct of a fan in the prior art;

FIG. 7 is a simulated turbulence energy diagram of a wind channel of a blower in accordance with an embodiment of the present application.

The reference numerals are expressed as:

1. a volute throat; 2. a first wall surface; 3. a boss; 4. a curved surface section; 5. a planar section; 6. a first guiding inclined surface; 7. a second guiding inclined surface; 8. a cross flow fan.

Detailed Description

Referring to FIG. 6 in combination, a simulated turbulence energy diagram of an air duct is shown. As can be seen from fig. 6, the air flow velocity and pressure are not uniform throughout the interior of the tunnel. The uneven air flow acts on the air duct wall surface to form air flow pressure pulsation along with time, and the air flow pulsation caused by the rotation of the fan blade continuously and periodically impacts the air duct wall surface, namely rotational noise is formed. The greater the non-uniformity of the airflow, the more noise. According to simulation analysis, turbulent kinetic energy in the air duct is mainly concentrated at one side of the volute throat and is a main generation source of noise, so that noise reduction treatment is intensively carried out on the main generation source of noise.

Referring to fig. 1 to 5 in combination, according to an embodiment of the present application, a volute includes a volute throat 1, a wall surface of an air channel where the volute throat 1 is located is a first wall surface 2, a boss 3 protruding from the first wall surface 2 is provided on the first wall surface 2, a width of the boss 3 extending from the volute throat 1 along an airflow flowing direction along an axial direction of the volute is a first width, a width of the first wall surface 2 along the axial direction of the volute is a second width, and the first width is smaller than the second width. The worm throat part refers to a position with the minimum distance between the air duct wall and the excircle of the fan impeller.

The volute forms a boss 3 protruding out of the wall surface on the wall surface of the air channel where the volute throat 1 is located, and the width of the boss 3 is smaller than that of the first wall surface 2, so that the height dislocation can be formed between the boss 3 and the wall surface where the volute throat is located in the axial direction of the volute, the pressure fluctuation of airflow on the wall surface where the volute throat is located forms phase dislocation excitation, when airflow pulsation continuously and periodically impacts the wall surface of the air channel, the uneven surface can enable the periodic impact of airflow to be generated at different time points, the pressure pulse is not at the same frequency point, the discretization treatment can be carried out on noise, the turbulent energy of airflow flow is reduced, and the airflow noise is reduced.

Preferably, along the axial direction of the scroll casing, a predetermined interval is provided between the first side edge of the boss 3 and the first side edge of the first wall surface 2, and a predetermined interval is provided between the second side edge of the boss 3 and the second side edge of the first wall surface 2. Because the boss 3 has the predetermined interval between the first wall surface 2 and both sides along the circumferential direction of the spiral case, therefore, the boss 3 can form high-low dislocation with the first wall surface 2 on both sides, thereby being capable of enabling pressure fluctuation of airflow incoming flow on the wall surface on the side of the spiral case throat to form more effective misphase excitation, being capable of carrying out discretization treatment on noise more effectively, further reducing turbulence energy of airflow flow and reducing airflow noise. Because the height dislocation is formed between the boss 3 and the first wall surfaces 2 on two sides, the influence of the height dislocation on the airflow flow on one side of the boss 3 can be avoided, the problem that effective discretization treatment cannot be formed on one side of the boss 3 is caused, and the noise reduction capability of the boss 3 is improved.

The boss 3 is provided with a first guiding inclined plane 6 at one side close to the volute throat 1, and the first guiding inclined plane 6 extends from the top surface of the boss 3 far away from the first wall surface 2 to the first wall surface 2; and/or the side of the boss 3 away from the volute throat 1 is provided with a second guiding inclined surface 7, and the second guiding inclined surface 7 extends from the top surface of the boss 3 away from the first wall surface 2 to the first wall surface 2. The first guiding inclined plane 6 can play a role in guiding, so that the incoming airflow can smoothly transition when flowing from the first wall surface 2 to the top surface of the boss 3, the phenomenon that the airflow is separated from the wall surface of the volute 1 is avoided, and turbulent noise is avoided. The second guiding inclined plane 7 can make the transition of the flow from the top surface of the boss 3 to the first wall surface 2 smooth, avoid the phenomenon that the air flow is separated from the wall surface of the volute 1, and avoid the generation of turbulent noise.

In this embodiment, the first wall surface 2 includes a curved surface section 4 and a planar section 5, the curved surface section 4 and the planar section 5 are sequentially disposed along the airflow flowing direction, and the boss 3 is disposed on the curved surface section 4. In general, the turbulence is mainly concentrated in the range of the curved surface section 4 of the first wall surface 2, so that the boss 3 is arranged on the curved surface section 4, the problem of turbulence noise can be effectively solved, the effect of the boss 3 can be more fully utilized, excessive material waste caused by overlong length of the boss 3 is avoided, and meanwhile, the processing difficulty of the boss 3 is reduced.

The first guiding inclined plane 6 is a plane, a concave cambered surface or a convex cambered surface; and/or the second guiding inclined plane 7 is a plane, a concave cambered surface or a convex cambered surface. Preferably, the two guiding inclined planes are all plane surfaces, so that the problem that the guiding airflow is separated from the top surface of the boss 3 due to the fact that the inclined planes are curved surfaces can be avoided, the airflow can flow along the wall, and the airflow noise is further reduced.

When the first guide inclined surface 6 is a plane, the angle between the first guide inclined surface 6 and the first wall surface 2 is 10 ° to 15 °.

When the second guiding inclined plane 7 is a plane, the included angle between the second guiding inclined plane 7 and the first wall surface 2 is 10 degrees to 15 degrees, and the second guiding inclined plane 7 can greatly reduce the gradient of the air flowing from the boss 3 to the first wall surface 2, so that the air flowing from the boss 3 to the first wall surface 2 is more gentle.

The first guide inclined plane 6 and the second guide inclined plane 7 are set to be at the angles, so that the airflow on the guide inclined plane can be more transition gentle, the phenomenon that the airflow is separated from the wall surface of the volute throat is difficult to occur, and turbulent noise can be further avoided.

The first guide inclined surface 6 extends from the scroll throat 1 in a direction away from the boss 3 and extends to the first wall surface 2 on the inflow side of the scroll throat 1. Specifically, in this embodiment, one end of the first guiding inclined surface 6 extends to the top surface of the boss 3, and the other end extends to the first wall surface 2 located on the incoming flow side of the volute throat 1, so as to ensure that the boss 3 can form more effective phase-dislocation excitation on pressure fluctuation caused by airflow flowing along the flowing direction of the airflow from the volute throat 1, so that the noise reduction effect is more remarkable.

The second guiding ramp 7 extends from the top surface of the boss 3 to the intersection of the curved surface section 4 and the planar section 5. Specifically, the curved surface section 4 intersects the plane section 5 at a straight line, and the intersection line of the second guiding inclined surface 7 and the plane section 5 coincides with the straight line, so that the second guiding inclined surface 7, the curved surface section 4, and the plane section 5 intersect at the same straight line. When the air flow smoothly flows from the boss 3 to the first wall surface 2 along the second guiding inclined surface 7, the air flow can flow onto the plane section 5 along the flowing tail end of the second guiding inclined surface 7 and can not flow onto the curved surface section 4 any more, so that turbulent flow phenomenon can not be generated, and turbulent noise can be effectively avoided.

Along the flow direction of the air flow, the boss 3 has a constant cross-section structure, and preferably, the cross section of the boss 3 is rectangular or trapezoidal.

In the present embodiment, when the cross section of the boss 3 is rectangular, the width of the boss 3 is 9 to 11mm and the height of the boss 3 protruding from the first wall surface 2 is 0.9 to 1.1mm within the cross section of the boss 3. The boss adopts the structure of equiheight mainly in order to the air current to flow smoothly when flowing through boss face, weakens the condition that appears air current disturbance or backward flow.

The arrow direction in fig. 5 is the airflow direction. Referring to fig. 5 in combination, in one embodiment, the boss 3 protrudes from the first wall surface 2 to have a uniform height, and the cross-sectional area of the boss 3 decreases along the flow direction of the air flow. Since the cross-sectional area of the boss 3 decreases along the flow direction of the air flow, after the air flow is guided onto the boss 3 by the first guiding inclined plane 6, the flow surface becomes narrower gradually in the process of flowing along the top surface of the boss 3, and in this process, part of the air flow is split onto the first wall surfaces 2 on both sides of the width direction of the boss 3, so that the time point of the periodic impact of the air flow can be further changed, the periodic impact of the air flow does not occur at the same time point, and the pressure pulse is not at the same frequency point, so that the effect of discretizing the noise is better, and the noise reduction effect is better. In addition, the structure with the decreasing sectional area has the flow guiding function, so that the air flow can better adhere to the wall surface for flowing.

The boss 3 is a plurality of, and a plurality of bosses 3 are arranged along the axis direction interval of spiral case. The bosses 3 arranged at intervals are matched with the first wall surface 2, so that a plurality of concave-convex structures can be formed, the air flow is distributed more uniformly in the flowing process of the air flow, the periodic impact of the air flow is not generated at the same time point, the pressure pulse frequency is changed, and the noise of the air flow is reduced.

According to an embodiment of the application, a fan assembly comprises a fan and the volute, wherein the fan is arranged in the volute.

The fan is a cross-flow fan 8, the cross-flow fan 8 comprises a plurality of cross-flow fan blades which are sequentially connected along the axial direction, a plurality of bosses 3 are arranged at intervals along the axial direction of the cross-flow fan 8, and the bosses 3 are arranged in one-to-one correspondence with the plurality of cross-flow fan blades. In this embodiment, the number of the bosses 3 is consistent with the number of the through-flow fan blades, and the types of the through-flow fan blades with different numbers of the through-flow fan blades are different, so that the number of the bosses is not fixed for the through-flow air channels of different types.

Preferably, the boss 3 is disposed corresponding to the middle position of the corresponding throttle blade. The cross-flow fan blades are integrally combined by the sections with the same length, and air flow mainly drives air flow by virtue of the rotation of the fan blades, so that the boss 3 is correspondingly arranged at the middle position of each section of the cross-flow fan blades, the air flow is strong, and the air flow is not correspondingly arranged at the joint between the sections of the cross-flow fan blades, thereby more effectively changing the pressure pulse frequency and reducing the air flow noise.

According to an embodiment of the application, an air conditioner comprises a fan and the volute, wherein the fan is arranged in the volute.

Referring to fig. 7 in combination, after the volute of the embodiment of the application is adopted, the air flow speed and the air pressure are distributed more uniformly in the whole air duct relative to fig. 6, so that the non-uniformity of the air flow can be effectively reduced, and the air flow noise can be reduced.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.

Claims

1. The volute is characterized by comprising a volute throat (1), wherein the wall surface of an air channel where the volute throat (1) is located is a first wall surface (2), a boss (3) protruding out of the first wall surface (2) is arranged on the first wall surface (2), the boss (3) extends from the volute throat (1) along the airflow flowing direction, the width of the boss (3) along the axial direction of the volute is a first width, the width of the first wall surface (2) along the axial direction of the volute is a second width, and the first width is smaller than the second width;

the boss (3) protrudes from the first wall surface (2) to be uniform in height, and the sectional area of the boss (3) is decreased gradually along the airflow flowing direction so as to split the airflow.

2. A volute according to claim 1, characterized in that along the axial direction of the volute there is a predetermined spacing between a first side edge of the boss (3) and a first side edge of the first wall (2), and a predetermined spacing between a second side edge of the boss and a second side edge of the first wall (2).

3. The volute of claim 1, wherein a first guiding ramp (6) is provided on the side of the boss (3) near the volute throat (1), the first guiding ramp (6) extending from the top surface of the boss (3) away from the first wall (2) to the first wall (2); and/or, a second guiding inclined plane (7) is arranged on one side, far away from the worm throat (1), of the boss (3), and the second guiding inclined plane (7) extends from the top surface, far away from the first wall surface (2), of the boss (3) to the first wall surface (2).

4. A volute according to claim 3, characterized in that the first wall surface (2) comprises a curved surface section (4) and a planar section (5), the curved surface section (4) and the planar section (5) being arranged along the direction of airflow, the boss (3) being arranged at the curved surface section (4).

5. A volute according to claim 3, characterized in that the first guiding ramp (6) is a plane, a concave arc or a convex arc; and/or the second guiding inclined plane (7) is a plane, a concave cambered surface or a convex cambered surface.

6. The volute of claim 5, wherein when the first guiding ramp (6) is planar, the angle between the first guiding ramp (6) and the first wall (2) is 10 ° to 15 °; and/or, when the second guiding inclined plane (7) is a plane, the included angle between the second guiding inclined plane (7) and the first wall surface (2) is 10-15 degrees.

7. A volute according to claim 4, wherein the first guiding ramp (6) extends from the volute throat (1) in a direction away from the boss (3); and/or the second guiding inclined surface (7) extends from the top surface of the boss (3) to the intersection position of the curved surface section (4) and the plane section (5).

8. A volute according to any one of claims 1 to 7, wherein the boss (3) is of constant cross-section along the flow direction of the airflow.

9. A volute according to claim 8, wherein the cross-section of the boss (3) is rectangular or trapezoidal.

10. A volute according to claim 9, wherein when the cross section of the boss (3) is rectangular, the width of the boss (3) is 9 to 11mm in the cross section of the boss (3), and the height of the boss (3) protruding from the first wall surface (2) is 0.9 to 1.1mm.

11. The volute of any one of claims 1 to 7, wherein the boss (3) is plural, and the plural bosses (3) are arranged at intervals along the axial direction of the volute.

12. A fan assembly comprising a fan and the volute of any one of claims 1 to 11, the fan being disposed within the volute.

13. The fan assembly according to claim 12, wherein the fan is a cross-flow fan (8), the cross-flow fan (8) comprises a plurality of cross-flow blades connected in sequence along an axial direction, the bosses (3) are a plurality of, the bosses (3) are arranged at intervals along the axial direction of the cross-flow fan (8), and the bosses (3) are arranged in one-to-one correspondence with the plurality of cross-flow blades.

14. Fan assembly according to claim 13, characterized in that the boss (3) is arranged in correspondence of the middle position of the respective throttle blade.

15. An air conditioner comprising a fan and the volute of any one of claims 1 to 11, the fan being disposed within the volute.