Asymmetric dual outlet centrifugal fan

Abstract

The present case provides an asymmetric dual-outlet centrifugal fan, including an upper cover, a lower cover and an impeller. The upper cover includes an air inlet. The lower cover and the upper cover are combined into a shell having an accommodation space, and a low-pressure air outlet and a high-pressure air outlet are formed, and the accommodation space connects the low-pressure air outlet, the high-pressure air outlet and the air inlet. The low-pressure air outlet and the high-pressure air outlet are respectively located at the side edges of the shell, and are respectively facing opposite directions. The opening cross-sectional area of ​​the low-pressure air outlet is smaller than the opening cross-sectional area of ​​the high-pressure air outlet. The length of the flow path formed from the air inlet to the low-pressure air outlet is greater than the length of the flow path formed from the air inlet to the high-pressure air outlet. The impeller is accommodated in the shell formed by the combination of the upper cover and the lower cover, relative to the air inlet in space, and rotates around the rotating shaft, sucking the air flow from the air inlet and guiding it to the low-pressure air outlet and the high-pressure air outlet respectively.

Description

Technical Field

[0001] The present invention relates to a centrifugal fan, and more particularly to an asymmetric dual-air outlet centrifugal fan, which can provide average performance under different impedances. Background Art

[0002] A centrifugal fan is a fluid machine with a wide range of applications. In the prior art, a common centrifugal fan has a single air outlet. However, in some application environments, such as a centrifugal fan for air circulation in a car, there is a need for dual air outlets. In addition to providing air supply in different directions, the dual air outlets also need to form different wind pressures, so as to provide different air volumes to the front and rear seats of the car, for example. The dual air outlets correspond to different wind pressures and air volumes, which will produce different flow channel wind resistances, which are easy to interact with each other and reduce the overall performance. Therefore, comprehensive performance must be considered during design, such as air volume, wind pressure, energy consumption, and noise, otherwise the goal of optimizing average performance cannot be achieved.

[0003] In view of this, it is necessary to provide an asymmetric dual-air outlet centrifugal fan that can provide average performance under different impedances to address the deficiencies of the conventional technology. Summary of the invention

[0004] The purpose of this case is to provide an asymmetric dual-air outlet centrifugal fan. The centrifugal fan has a first air outlet and a second air outlet, which serve as a low-pressure air outlet and a high-pressure air outlet respectively. The opening cross-sectional area of ​​the high-pressure air outlet is larger than the opening cross-sectional area of ​​the low-pressure air outlet, so as to provide average performance under different impedances, realize high-pressure air outlet from the air inlet to the high-pressure air outlet, and low-pressure air outlet from the air inlet to the low-pressure air outlet.

[0005] Another object of the present invention is to provide an asymmetric dual-air outlet centrifugal fan, wherein the length of the flow path formed from the air inlet to the low-pressure air outlet is greater than the length of the flow path formed from the air inlet to the high-pressure air outlet, so as to provide average performance under different impedances, and realize high-pressure air outlet from the air inlet to the high-pressure air outlet, and low-pressure air outlet from the air inlet to the low-pressure air outlet.

[0006] Another object of the present invention is to provide an asymmetric dual-air outlet centrifugal fan, wherein the housing forms two cross-sectional heights corresponding to the low-pressure air outlet and the high-pressure air outlet through the cross-sectional area of ​​the rotating shaft, and the cross-sectional height corresponding to the low-pressure air outlet is smaller than the cross-sectional height corresponding to the high-pressure air outlet, so as to provide average performance under different impedances, realize high-pressure air outlet from the air inlet to the high-pressure air outlet, and low-pressure air outlet from the air inlet to the low-pressure air outlet.

[0007] Another object of the present case is to provide an asymmetric dual-outlet centrifugal fan in which the inner wall of the shell is connected by a line at the low-pressure outlet close to the high-pressure outlet, dividing the flow area in the shell into a low-pressure flow area and a high-pressure flow area, and by designing the projected area of ​​the high-pressure flow area to be larger than the projected area of ​​the low-pressure flow area, so as to provide average performance under different impedances, thereby achieving high-pressure outlet from the air inlet to the high-pressure outlet and low-pressure outlet from the air inlet to the low-pressure outlet.

[0008] In order to achieve the aforementioned purpose, the present invention provides an asymmetric dual-outlet centrifugal fan, including an upper cover, a lower cover and an impeller. The upper cover includes an air inlet. The lower cover and the upper cover are combined into a shell having an accommodation space, and a low-pressure air outlet and a high-pressure air outlet are formed, and the accommodation space connects the low-pressure air outlet, the high-pressure air outlet and the air inlet. The low-pressure air outlet and the high-pressure air outlet are respectively located at the side edges of the shell, and face opposite directions. The opening cross-sectional area of ​​the low-pressure air outlet is smaller than the opening cross-sectional area of ​​the high-pressure air outlet. The impeller is accommodated in the accommodation space of the shell, relative to the air inlet in space, and rotates around the rotating shaft, introducing the airflow from the air inlet and guiding it to the low-pressure air outlet and the high-pressure air outlet respectively.

[0009] In order to achieve the above-mentioned purpose, the present case further provides an asymmetric dual-outlet centrifugal fan, including an upper cover, a lower cover and an impeller. The upper cover includes an air inlet. The lower cover and the upper cover are combined into a shell with a accommodating space, and a low-pressure air outlet and a high-pressure air outlet are formed, and the accommodating space connects the low-pressure air outlet, the high-pressure air outlet and the air inlet. The low-pressure air outlet and the high-pressure air outlet are respectively located at the side edges of the shell, and are respectively in opposite directions. The length of the flow channel formed from the air inlet to the low-pressure air outlet is greater than the length of the flow channel formed from the air inlet to the high-pressure air outlet. The impeller is accommodated in the accommodating space of the shell, relative to the air inlet in space, and rotates around the rotating shaft, introducing the airflow from the air inlet and guiding it to the low-pressure air outlet and the high-pressure air outlet respectively.

[0010] In order to achieve the aforementioned purpose, the present case further provides an asymmetric dual-outlet centrifugal fan, including an upper cover, a lower cover and an impeller. The upper cover includes an air inlet. The lower cover and the upper cover are combined into a shell with an accommodating space, and form a low-pressure air outlet and a high-pressure air outlet, which are connected to the air inlet. The low-pressure air outlet and the high-pressure air outlet are respectively located at the side edges of the shell, and face opposite directions. The shell forms two cross-sectional heights corresponding to the low-pressure air outlet and the high-pressure air outlet through the cross-section of the rotating shaft, wherein the cross-sectional height corresponding to the low-pressure air outlet is smaller than the cross-sectional height corresponding to the high-pressure air outlet. The impeller is accommodated in the accommodating space, spatially relative to the air inlet, and rotates around the rotating shaft to guide the airflow from the air inlet and guide it to the low-pressure air outlet and the high-pressure air outlet respectively.

[0011] To achieve the above-mentioned purpose, the present invention also provides an asymmetric dual-outlet centrifugal fan, including an upper cover, a lower cover and an impeller. The upper cover includes an air inlet. The lower cover and the upper cover are combined into a shell, and form a accommodating space, a low-pressure air outlet and a high-pressure air outlet, and the low-pressure air outlet and the high-pressure air outlet are connected to the air inlet through the accommodating space. The low-pressure air outlet and the high-pressure air outlet are respectively located at the side edges of the shell, and are respectively in opposite directions. The inner wall of the shell is connected by a line at the low-pressure air inlet near the high-pressure air outlet, and the flow channel area in the shell is divided into a low-pressure flow channel area and a high-pressure flow channel area, wherein the high-pressure flow channel area corresponds to the second air outlet and the projected area of ​​the high-pressure flow channel area is larger than the projected area of ​​the low-pressure flow channel area. The impeller is accommodated in the accommodating space of the shell composed of the upper cover and the lower cover, relative to the air inlet in space, and rotates around the rotating shaft, introducing the airflow from the air inlet and guiding it to the low-pressure air outlet and the high-pressure air outlet respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural diagram showing an asymmetric double-air outlet centrifugal fan from an upper perspective in a preferred embodiment of the present invention;

[0013] Figure 2 It is a three-dimensional structural diagram showing an asymmetric double-air outlet centrifugal fan from a bottom perspective in a preferred embodiment of the present invention;

[0014] Figure 3 is a structural exploded view of an asymmetric dual-air outlet centrifugal fan from an upper perspective showing a preferred embodiment of the present invention;

[0015] Figure 4 is a structural exploded view of an asymmetric dual-air outlet centrifugal fan from a bottom perspective that discloses a preferred embodiment of the present invention;

[0016] Figure 5 It is a top view of an asymmetric double-air outlet centrifugal fan of a preferred embodiment of the present invention;

[0017] Figure 6 It is a bottom view of an asymmetric dual-air outlet centrifugal fan according to a preferred embodiment of the present invention;

[0018] Figure 7 It is a three-dimensional structural diagram from an upper perspective of the lower cover structure of the asymmetric double-air outlet centrifugal fan of a preferred embodiment of the present case;

[0019] Figure 8 It is a three-dimensional structural diagram from the bottom perspective of the upper cover structure of the asymmetric double-air outlet centrifugal fan of the preferred embodiment of the present case;

[0020] Fig. 9A The asymmetric double air outlet centrifugal fan edge of the preferred embodiment of the present invention is disclosed. Figure 6 Midline The cross-sectional view taken;

[0021] Fig. 9B is revealing Fig. 9A A partial enlarged view of the middle area P;

[0022] Fig.10 The asymmetric double air outlet centrifugal fan edge of the preferred embodiment of the present invention is disclosed. Figure 6 Midline The cross-sectional view taken;

[0023] Fig.11 The asymmetric double air outlet centrifugal fan edge of the preferred embodiment of the present invention is disclosed. Figure 6 Midline The cross-sectional view taken;

[0024] Fig.12 The figure discloses the flow path profile of the asymmetric double-air outlet centrifugal fan of the preferred embodiment of the present invention.

[0025]

Explanation of symbols

[0026] 1: Centrifugal fan

[0027] 10: Upper cover

[0028] 11: Bevel

[0029] 12: Connecting ring

[0030] 13: Ribs

[0031] 14: Fasteners

[0032] 15: Raised ribs

[0033] 20: Lower cover

[0034] 21: Protruding parts

[0035] 22: Locking part

[0036] 23: Screw hole

[0037] 24: Groove

[0038] 25: Shell

[0039] 30: Air inlet

[0040] 40: Low pressure air outlet

[0041] 50: High pressure air outlet

[0042] 60: Impeller

[0043] 61: Wheel Hub

[0044] 62: Blade

[0045] 63: Magnet

[0046] 64: Groove

[0047] 65: Shaft

[0048] Line segment

[0049] AL: Low pressure flow area

[0050] AH: High-pressure flow channel area

[0051] FL: Airflow Path

[0052] H1: Height of the first section

[0053] H2: Height of the second section

[0054] H3: Height of the third section

[0055] H4: Height of the fourth section

[0056] H5: Fifth section height

[0057] H6: Height of the sixth section

[0058] Ic: Impeller circumference

[0059] J: Rotating axis

[0060] L: Connection

[0061] S0: First top surface

[0062] S1: Second top surface

[0063] S2: Third top surface

[0064] T0: Bottom

[0065] T1: First slope

[0066] T2: Second slope

[0067] X, Y, Z: Axis DETAILED DESCRIPTION

[0068] Some typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different aspects without departing from the scope of the present invention, and the description and drawings are essentially for illustrative purposes rather than for limiting the present invention.

[0069] Figure 1It is a three-dimensional structural diagram of an asymmetric dual-air outlet centrifugal fan from an upper perspective that discloses a preferred embodiment of the present case. In this embodiment, the asymmetric dual-air outlet centrifugal fan 1 (hereinafter referred to as the centrifugal fan) includes an upper cover 10 and a lower cover 20. The upper cover 10 has an air inlet 30, which faces a Z-axis direction shown in the figure. In this embodiment, the air inlet 30 has a circular shape. The upper cover 10 also includes an inclined plane 11, a connecting ring 12 and a plurality of ribs 13. The inclined plane 11 is arranged around the periphery of the air inlet 30, the ribs 13 are arranged at the air inlet 30 to prevent foreign matter from entering the air inlet 30, and the connecting ring 12 connects the ribs 13 to strengthen the structural strength of the ribs 13. In addition, in this embodiment, the upper cover 10 has a plurality of fasteners 14, and the lower cover 20 has a plurality of protrusions 21. The fasteners 14 and the protrusions 21 are opposite to each other in space, and each fastener 14 is engaged with the corresponding protrusion 21, so that the upper cover 10 and the lower cover 20 are combined to form a housing 25 of the centrifugal fan 1, and a low pressure outlet 40 as a first air outlet and a high pressure outlet 50 as a second air outlet are formed. The low pressure outlet 40 and the high pressure outlet 50 are respectively connected to the air inlet 30 through the accommodating space of the housing 25. In this embodiment, the low pressure outlet 40 and the high pressure outlet 50 are respectively located at the side edges of the housing 25 of the centrifugal fan 1, and face opposite directions. In this example, after the centrifugal fan 1 takes in air from the air inlet 30, it is discharged from the low-pressure air outlet 40 and the high-pressure air outlet 50, respectively, wherein the low-pressure air outlet 40 and the high-pressure air outlet 50 are structured to form a double air outlet of the centrifugal fan 1, and the wind pressure and air volume of the high-pressure air outlet 50 are greater than the wind pressure and air volume of the low-pressure air outlet 40, and the detailed structural differences will be described later. In this embodiment, the outer surface of the upper cover 10 also has a plurality of ribs 15, which are adjacent to the low-pressure air outlet 40. In addition, the lower cover 20 also includes a plurality of attachment portions 22, which are used to lock and fix the centrifugal fan 1 on an object, such as the bottom surface of a vehicle seat, to provide airflows of different directions and different air volumes with asymmetric double air outlets.

[0070] Figure 2 2 is a three-dimensional structural diagram of an asymmetric dual-air outlet centrifugal fan of a preferred embodiment of the present invention from a bottom perspective. In this embodiment, the lower cover 20 has three locking portions 22 disposed on the outer periphery of the lower cover 20. Each locking portion 22 also includes a screw hole 23 for fixing the centrifugal fan 1 to an object. The user can, for example, fix the centrifugal fan 1 to the bottom surface of the vehicle seat by passing a screw or a bolt through the screw hole 23 of the locking portion 22, and the lower cover 20 fits the bottom surface of the vehicle seat.

[0071] Figure 3 1 is a structural exploded view of an asymmetric double-outlet centrifugal fan of a preferred embodiment of the present invention from an upper perspective. In this embodiment, the centrifugal fan 1 includes an impeller 60, which is disposed between the upper cover 10 and the lower cover 20, that is, accommodated in the accommodation space of the housing 25 formed by the combination of the upper cover 10 and the lower cover 20, and the impeller 60 rotates around the rotation axis J. The rotation axis J is substantially located at the center of the air inlet 30. The hub 61 of the impeller 60 is spatially relative to the air inlet 30 on the upper cover 10, and the impeller 60 has a plurality of blades 62 arranged around the periphery of the hub 61. A plurality of ribs 13 extend from the periphery of the air inlet 30 to the center of the air inlet 30 and are connected to the connecting ring 12, and cover the center of the air inlet 30, so that the center of the impeller 60 is not exposed. When the impeller 60 rotates around the rotation axis J, the airflow is directed from the air inlet 30 through the impeller 60 to the low-pressure air outlet 40 and the high-pressure air outlet 50. In addition, in this embodiment, the inner bottom surface of the lower cover 20 may also be concavely provided with a groove 24 for accommodating the wires connected to the motor in the impeller 60. Of course, the present invention is not limited to this.

[0072] Figure 4 1 is a structural exploded view of an asymmetric dual-outlet centrifugal fan of a preferred embodiment of the present invention from a bottom perspective. In this embodiment, the impeller 60 of the centrifugal fan 1 also includes a magnet 63 and a plurality of recesses 64. The magnet 63 is located on the inner side of the impeller 60 and is arranged in an annular shape. A plurality of recesses 64 are arranged on the bottom surface of the impeller 60 and are located between the blades 62 and the magnet 63. In this embodiment, when the impeller 60 is driven to rotate around the rotating shaft J, the airflow is introduced into the centrifugal fan 1 through the air inlet 30 along the axial direction, and then discharged through the low-pressure air outlet 40 and the high-pressure air outlet 50 along the radial direction. Through the structural arrangement of the upper cover 10 and the lower cover 20, two flow paths with unequal volumes are formed from the air inlet 30 to the low-pressure air outlet 40 and from the air inlet 30 to the high-pressure air outlet 50, so as to provide average performance under different impedances, and realize low-pressure air outlet from the air inlet 30 to the low-pressure air outlet 40 and high-pressure air outlet from the air inlet 30 to the high-pressure air outlet 50. The detailed structural features of the upper cover 10 and the lower cover 20 will be described later.

[0073] Figure 51 is a top view of an asymmetric dual-outlet centrifugal fan according to a preferred embodiment of the present invention. In this embodiment, the air inlet 30 faces the Z-axis direction. The plurality of blades 62 of the impeller 60 are radially arranged and arranged around the outer periphery of the hub 61, and the blades 62 are at least partially exposed to the air inlet 30. When the impeller 60 is driven to rotate, the air flow is introduced from the air inlet 30 and then transmitted along the XY plane, and two flow passages with unequal volumes are formed from the air inlet 30 to the low-pressure air outlet 40 and from the air inlet 30 to the high-pressure air outlet 50. The centrifugal fan 1 can provide an asymmetric dual-outlet. In this embodiment, the opening cross-sectional area of ​​the low-pressure air outlet 40 is, for example, smaller than the opening cross-sectional area of ​​the high-pressure air outlet 50, and the flow passage formed from the air inlet 30 to the low-pressure air outlet 40 has a smaller cross-sectional area than the flow passage formed from the air inlet 30 to the high-pressure air outlet 50. On the basis of the design of the same height level, a plurality of convex ribs 15 can also be formed on the outer surface of the upper cover 10, which are arranged adjacent to the low-pressure air outlet 40, without increasing the overall height of the centrifugal fan 1 in the Z-axis direction. In addition, in the present embodiment, a bevel 11 is arranged at the periphery of the upper cover 10 corresponding to the air inlet 30. The connecting ring 12 is located in the air inlet 30 and is arranged concentrically with the air inlet 30, that is, the rotating shaft J of the centrifugal fan 1 passes through the center of the connecting ring 12. A plurality of ribs 13 extend inward from the outer periphery of the air inlet 30 and converge to the center of the air inlet 30 through the connecting ring 12 to cover the center of the air inlet 30. In the present embodiment, a plurality of ribs 13 are arranged at equal distances from each other and form a counterclockwise vortex to match the airflow direction of the air inlet 30. Of course, the present case is not limited to this. In other embodiments, the form of the bevel 11, the number of connecting rings 12, the number of ribs 13 and the bending form can be adjusted according to the actual application requirements, and will not be repeated here. In other words, the air inlet 30 constructed by the inclined surface 11 , the connecting ring 12 and the plurality of ribs 13 has the characteristic of a counterclockwise vortex, and the center of the air inlet 30 does not have any through opening or hole, and the center of the impeller 60 is not exposed.

[0074] Figure 6 1 is a bottom view of an asymmetric dual-air outlet centrifugal fan of a preferred embodiment of the present invention. To further illustrate the flow path formed from the air inlet 30 to the low-pressure air outlet 40 and the flow path formed from the air inlet 30 to the high-pressure air outlet 50, the present invention uses a line segment passing through the rotation axis J as an example. Line segment and line segments The impeller circumference Ic is divided into six equal parts. The flow channel formed by the air inlet 30 to the low-pressure air outlet 40 and the flow channel formed by the air inlet 30 to the high-pressure air outlet 50 are on the line segment passing through the rotation axis J. Surface, line segment and line segments The cross-sectional differences will be described in detail later.

[0075] Figure 7The present invention discloses the lower cover structure of the asymmetric dual-air outlet centrifugal fan of the preferred embodiment of the present case. In the present embodiment, the inner bottom surface of the lower cover 20 may be provided with a bottom surface T0, a first inclined surface T1 and a second inclined surface T2 at locations corresponding to the air inlet 30, the low-pressure air outlet 40 and the high-pressure air outlet 50, for example. The bottom surface T0 is, for example, a plane, which corresponds to the air inlet 30 and the blades 62 of the impeller 60 in space. The first inclined surface T1 extends from the bottom surface T0 to the low-pressure air outlet 40. The second inclined surface T2 extends from the bottom surface T0 to the high-pressure air outlet 50. The first inclined surface T1 and the second inclined surface T2 have different slopes. In the present embodiment, the slope of the first inclined surface T1 is greater than the slope of the second inclined surface T2. Thereby, the flow channel formed from the air inlet 30 to the low-pressure air outlet 40 can have a smaller cross-sectional area than the flow channel formed from the air inlet 30 to the high-pressure air outlet 50, so as to provide average performance under different impedances, and realize low-pressure air outlet from the air inlet 30 to the low-pressure air outlet 40, and high-pressure air outlet from the air inlet 30 to the high-pressure air outlet 50. In this embodiment, the groove 24 can be, for example, self-concavely set in the bottom surface T0, without affecting the flow channel formed from the air inlet 30 to the high-pressure air outlet 50.

[0076] Figure 8 The upper cover structure of the asymmetric double-air outlet centrifugal fan of the preferred embodiment of the present case is disclosed. In this embodiment, the air inlet 30 is constructed by the inclined surface 11, the connecting ring 12 and a plurality of ribs 13 of the upper cover 10. In addition, the inclined surface 11 further protrudes toward the inside of the housing 25 of the centrifugal fan 1 to guide the airflow introduced into the air inlet 30 into the centrifugal fan 1. In this embodiment, the inner top surface of the upper cover 20 is also provided with a first top surface S0, a second top surface S1 and a third top surface S2 at the corresponding positions of the air inlet 30, the low-pressure air outlet 40 and the high-pressure air outlet 50. The first top surface S0 is located at the outer periphery of the inclined surface 11 and is connected to the inclined surface 11. The second top surface S1 extends from the first top surface S0 to the low-pressure air outlet 40. The third top surface S2 extends from the first top surface S0 to the high-pressure air outlet 50. In this embodiment, the first top surface S0, the second top surface S1 and the third top surface S2 have different horizontal heights. Taking the first top surface S0 as a reference, the second top surface S1 is convexly arranged from the horizontal height of the first top surface S0 toward the inside of the centrifugal fan 1, and the third top surface S2 is concavely arranged from the horizontal height of the first top surface S0 toward the outside of the centrifugal fan 1, so that the horizontal height of the second top surface S1 is smaller than the horizontal height of the first top surface S0, and the horizontal height of the third top surface S2 is larger than the horizontal height of the first top surface S0. In this way, the flow channel formed from the air inlet 30 to the low-pressure air outlet 40 can have a smaller cross-sectional area than the flow channel formed from the air inlet 30 to the high-pressure air outlet 50, so as to provide average performance under different impedances, and realize low-pressure air outlet from the air inlet 30 to the low-pressure air outlet 40, and high-pressure air outlet from the air inlet 30 to the high-pressure air outlet 50.

[0077] Fig. 9AThe asymmetric double air outlet centrifugal fan edge of the preferred embodiment of the present invention is disclosed. Figure 6 Midline Please refer to the section view taken. Figure 6 and Fig. 9A , the flow channel formed from the air inlet 30 to the low pressure air outlet 40 is on the line segment The first cross-sectional height H1 is formed on the upper side of the air inlet 30 and the high-pressure air outlet 50. The first cross-sectional height H1 is smaller than the second cross-sectional height H2. Thus, the flow passage formed from the air inlet 30 to the low-pressure air outlet 40 can have a smaller cross-sectional area than the flow passage formed from the air inlet 30 to the high-pressure air outlet 50, so as to provide average performance under different impedances, and realize low-pressure air outlet from the air inlet 30 to the low-pressure air outlet 40, and high-pressure air outlet from the air inlet 30 to the high-pressure air outlet 50.

[0078] Fig. 9B is revealing Fig. 9A A partial enlarged view of the middle area P. In the present embodiment, the hub 61 is provided with a shaft 65 disposed along the rotating axis J of the centrifugal fan 1. The impeller 60 also includes a stator 66, corresponding to the magnet 63 to form a motor for driving the impeller 60. In the present embodiment, an outer rotor motor is used to drive the impeller 60. In addition, in the present embodiment, the inclined surface 11 of the upper cover 10 may have an arc-shaped cross-sectional structure when extending toward the air inlet 30. In the present embodiment, the inner peripheries of the plurality of blades 62 are exposed through the air inlet 30, and the outer peripheries of the plurality of blades 62 are covered by the upper cover 10, and the height of each blade 62 increases along the radial direction, so the maximum height of the blade 62 is located at the outermost periphery. The inclined surface 11 overlaps with the blade 62 in the Z-axis direction. Thus, when the impeller 60 drives the blades 62 to rotate, the air flow can enter the centrifugal fan 1 from the air inlet 30 through the guide of the inclined surface 11, and then flow to the flow channel formed by the low-pressure air outlet 40 and the flow channel formed by the high-pressure air outlet 50 respectively, realizing the application of the asymmetric dual air outlet in this case.

[0079] Fig.10 The asymmetric double air outlet centrifugal fan edge of the preferred embodiment of the present invention is disclosed. Figure 6 Midline Please refer to the section view taken. Figure 6 and Fig.10 , the flow channel formed from the air inlet 30 to the high pressure air outlet 50 is on the line segment The third cross-sectional height H3 is formed on the upper side, and the flow passage formed from the air inlet 30 to the low-pressure air outlet 40 is formed on the line segment The third section height H3 is greater than the fourth section height H4. Thus, the flow channel formed from the air inlet 30 to the high pressure air outlet 50 can have a larger cross-sectional area than the flow channel formed from the air inlet 30 to the low pressure air outlet 40, so as to provide average performance under different impedances, and realize high pressure air outlet from the air inlet 30 to the high pressure air outlet 50, and low pressure air outlet from the air inlet 30 to the low pressure air outlet 40.

[0080] Fig.11 The asymmetric double air outlet centrifugal fan edge of the preferred embodiment of the present invention is disclosed. Figure 6 Midline Please refer to the section view taken. Figure 6 and Fig.11 , the flow channel formed from the air inlet 30 to the high pressure air outlet 50 is on the line segment The fifth cross-sectional height H5 is formed on the upper side, and the flow passage formed from the air inlet 30 to the low-pressure air outlet 40 is formed on the line segment The fifth section height H5 is greater than the sixth section height H6. Thus, the flow channel formed from the air inlet 30 to the high pressure air outlet 50 can have a larger cross-sectional area than the flow channel formed from the air inlet 30 to the low pressure air outlet 40, so as to provide average performance under different impedances, and realize high pressure air outlet from the air inlet 30 to the high pressure air outlet 50, and low pressure air outlet from the air inlet 30 to the low pressure air outlet 40.

[0081] Fig.12 The flow channel profile of the asymmetric double-outlet centrifugal fan of the preferred embodiment of the present invention is disclosed. In the centrifugal fan 1 of the present invention, the inner wall of the shell 25 composed of the upper cover 10 and the lower cover 20 is connected at the line L at the low-pressure air inlet 40 near the high-pressure air outlet 50, and the flow channel area in the shell 25 is divided into a low-pressure flow channel area AL and a high-pressure flow channel area AH. By designing the projection area of ​​the high-pressure flow channel area AH to be larger than the projection area of ​​the low-pressure flow channel area AL, average performance is provided under different impedances, and high-pressure air outlet from the air inlet 30 to the high-pressure air outlet 50 and low-pressure air outlet from the air inlet 30 to the low-pressure air outlet 40 are achieved. Furthermore, the low-pressure flow channel area AL and the high-pressure flow channel area AH correspond to form a low-pressure flow channel profile FL and a high-pressure flow channel profile FH, respectively. The inner side wall length corresponding to the high-pressure flow channel profile FH is smaller than the inner side wall length corresponding to the low-pressure flow channel profile FL. Thereby, the length of the flow path formed from the air inlet 30 to the high-pressure air outlet 50 is smaller than the length of the flow path formed from the air inlet 30 to the low-pressure air outlet 40, so as to provide average performance under different impedances, thereby achieving high-pressure air outlet from the air inlet 30 to the high-pressure air outlet 50, and low-pressure air outlet from the air inlet 30 to the low-pressure air outlet 40.

[0082] In summary, the present invention provides an asymmetric dual-outlet centrifugal fan. The opening cross-sectional area of ​​the high-pressure outlet is larger than the opening cross-sectional area of ​​the low-pressure outlet, and the length of the flow path formed from the air inlet to the low-pressure outlet is larger than the length of the flow path formed from the air inlet to the high-pressure outlet, so as to provide average performance under different impedances, and realize high-pressure outlet from the air inlet to the high-pressure outlet, and low-pressure outlet from the air inlet to the low-pressure outlet. In addition, the shell forms two cross-sectional heights corresponding to the low-pressure outlet and the high-pressure outlet through the cross-sectional area of ​​the rotating shaft, and the cross-sectional height corresponding to the low-pressure outlet is designed to be smaller than the cross-sectional height corresponding to the high-pressure outlet, so as to provide average performance under different impedances, and realize high-pressure outlet from the air inlet to the high-pressure outlet, and low-pressure outlet from the air inlet to the low-pressure outlet. Furthermore, the inner wall of the shell is connected by a line at the low-pressure air inlet close to the high-pressure air outlet, which divides the flow area in the shell into a low-pressure flow area and a high-pressure flow area. By designing the projected area of ​​the high-pressure flow area to be larger than the projected area of ​​the low-pressure flow area, average performance is provided under different impedances, thereby achieving high-pressure air outlet from the air inlet to the high-pressure air outlet and low-pressure air outlet from the air inlet to the low-pressure air outlet.

[0083] This case can be modified in various ways by those skilled in the art, but all of them are within the scope of protection of the attached claims.

Claims

1. A double-air outlet centrifugal fan, characterized in that: include: A top cover including an air inlet; A lower cover is combined with the upper cover to form a shell having an accommodating space, and a first air outlet and a second air outlet are formed, the first air outlet and the second air outlet are connected to the air inlet through the accommodating space and are respectively located at the side edge of the shell and in opposite directions, wherein the opening cross-sectional area of ​​the first air outlet is smaller than the opening cross-sectional area of ​​the second air outlet; as well as an impeller, accommodated in the accommodation space of the housing, spatially opposite to the air inlet, and rotating around a rotation axis to guide the airflow from the air inlet to the first air outlet and the second air outlet respectively; The upper cover has an inclined surface at the periphery corresponding to the air inlet protruding toward the interior of the shell, and the upper cover includes a first top surface, a second top surface and a third top surface, the first top surface is connected to the inclined surface, the second top surface extends from the first top surface to the first air outlet, the third top surface extends from the first top surface to the second air outlet, and the first top surface, the second top surface and the third top surface have different horizontal heights respectively.

2. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The upper cover includes a plurality of ribs and a connecting ring. The connecting ring is located in the air inlet. The plurality of ribs extend inward from the outer periphery of the air inlet and are connected to the center of the air inlet through the connecting ring.

3. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The upper cover has a plurality of fasteners, and the lower cover has a plurality of convex parts. The fasteners and the convex parts are opposite to each other in space, and each fastener is buckled with the corresponding convex part, so that the upper cover and the lower cover are combined to form the shell.

4. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The lower cover includes a plurality of locking portions, and each of the locking portions further includes a screw hole.

5. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The lower cover includes a bottom surface, a first inclined surface and a second inclined surface, the bottom surface spatially corresponds to the air inlet, the first inclined surface extends from the bottom surface to the first air outlet, and the second inclined surface extends from the bottom surface to the second air outlet, wherein the slope of the first inclined surface is different from the slope of the second inclined surface.

6. The dual-air outlet centrifugal fan according to claim 5, characterized in that: The slope of the first inclined surface is greater than the slope of the second inclined surface.

7. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The horizontal height of the first top surface is greater than the horizontal height of the second top surface, and less than the horizontal height of the third top surface.

8. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The length of the flow channel formed from the air inlet to the first air outlet is greater than the length of the flow channel formed from the air inlet to the second air outlet.

9. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The shell has two cross-sectional heights formed by the cross-section of the rotating shaft, which respectively correspond to the first air outlet and the second air outlet, wherein the cross-sectional height corresponding to the first air outlet is smaller than the cross-sectional height corresponding to the second air outlet.

10. The dual-air outlet centrifugal fan according to claim 1, characterized in that: The inner wall of the shell at the first air outlet and the inner wall of the shell at the second air outlet form a connecting line, and the connecting line divides the flow channel area in the shell into a low-pressure flow channel area and a high-pressure flow channel area, wherein the high-pressure flow channel area corresponds to the second air outlet, and on the XY plane, the projection area of ​​the high-pressure flow channel area is larger than the projection area of ​​the low-pressure flow channel area.

11. A double-air outlet centrifugal fan, characterized in that: include: A top cover including an air inlet; A lower cover is combined with the upper cover to form a shell, and a first air outlet and a second air outlet are formed, which are connected to the air inlet, and the first air outlet and the second air outlet are respectively located at the side edges of the shell and face opposite directions, wherein the length of the flow path formed from the air inlet to the first air outlet is greater than the length of the flow path formed from the air inlet to the second air outlet; and an impeller, accommodated in the housing and rotating around a rotating shaft, for introducing airflow from the air inlet to the first air outlet and the second air outlet respectively; The opening cross-sectional area of ​​the first air outlet is smaller than the opening cross-sectional area of ​​the second air outlet; The upper cover has an inclined surface at the periphery corresponding to the air inlet protruding toward the interior of the shell, and the upper cover includes a first top surface, a second top surface and a third top surface, the first top surface is connected to the inclined surface, the second top surface extends from the first top surface to the first air outlet, the third top surface extends from the first top surface to the second air outlet, and the first top surface, the second top surface and the third top surface have different horizontal heights respectively.

12. The dual-air outlet centrifugal fan according to claim 11, characterized in that: The shell has two cross-sectional heights formed by the cross-section of the rotating shaft, which respectively correspond to the first air outlet and the second air outlet, wherein the cross-sectional height corresponding to the first air outlet is smaller than the cross-sectional height corresponding to the second air outlet.

13. The dual-air outlet centrifugal fan according to claim 11, characterized in that: The inner wall of the shell at the first air outlet and the inner wall of the shell at the second air outlet form a connecting line, and the connecting line divides the flow channel area in the shell into a low-pressure flow channel area and a high-pressure flow channel area, wherein the high-pressure flow channel area corresponds to the second air outlet, and on the XY plane, the projection area of ​​the high-pressure flow channel area is larger than the projection area of ​​the low-pressure flow channel area.

14. A double-air outlet centrifugal fan, characterized in that: include: A top cover including an air inlet; A lower cover is combined with the upper cover to form a shell, and forms a first air outlet and a second air outlet connected to the air inlet, wherein the first air outlet and the second air outlet are respectively located at the side edges of the shell and face in opposite directions; and an impeller, accommodated in the housing and rotating around a rotating shaft, to guide the airflow from the air inlet to the first air outlet and the second air outlet respectively; The housing is formed through a cross section of the rotating shaft to form two cross-sectional heights corresponding to the first air outlet and the second air outlet, respectively; the cross-sectional height corresponding to the first air outlet is smaller than the cross-sectional height corresponding to the second air outlet; and the opening cross-sectional area of ​​the first air outlet is smaller than the opening cross-sectional area of ​​the second air outlet; The upper cover has an inclined surface at the periphery corresponding to the air inlet protruding toward the interior of the shell, and the upper cover includes a first top surface, a second top surface and a third top surface, the first top surface is connected to the inclined surface, the second top surface extends from the first top surface to the first air outlet, the third top surface extends from the first top surface to the second air outlet, and the first top surface, the second top surface and the third top surface have different horizontal heights respectively.

15. The dual-air outlet centrifugal fan according to claim 14, characterized in that: The length of the flow channel formed from the air inlet to the first air outlet is greater than the length of the flow channel formed from the air inlet to the second air outlet.

16. The dual-air outlet centrifugal fan according to claim 14, characterized in that: The inner wall of the shell at the first air outlet and the inner wall of the shell at the second air outlet form a connecting line, and the connecting line divides the flow channel area in the shell into a low-pressure flow channel area and a high-pressure flow channel area, wherein the high-pressure flow channel area corresponds to the second air outlet, and on the XY plane, the projection area of ​​the high-pressure flow channel area is larger than the projection area of ​​the low-pressure flow channel area.

17. A double-air outlet centrifugal fan, characterized in that: include: A top cover including an air inlet; A lower cover is combined with the upper cover to form a shell, and forms a accommodating space, a first air outlet and a second air outlet, the first air outlet and the second air outlet are connected to the air inlet through the accommodating space, wherein the first air outlet and the second air outlet are respectively located at the side edges of the shell and are respectively in opposite directions, wherein the inner side wall of the shell at the first air outlet and the inner side wall of the shell at the second air outlet form a connecting line, and the connecting line divides the flow channel area in the shell into a low-pressure flow channel area and a high-pressure flow channel area, wherein the high-pressure flow channel area corresponds to the second air outlet, and on the XY plane, the projected area of ​​the high-pressure flow channel area is larger than the projected area of ​​the low-pressure flow channel area; and an impeller, accommodated in the accommodation space, spatially opposite to the air inlet, and rotating around a rotation axis to guide the airflow from the air inlet to the first air outlet and the second air outlet respectively; The opening cross-sectional area of ​​the first air outlet is smaller than the opening cross-sectional area of ​​the second air outlet; The upper cover has an inclined surface at the periphery corresponding to the air inlet protruding toward the interior of the shell, and the upper cover includes a first top surface, a second top surface and a third top surface, the first top surface is connected to the inclined surface, the second top surface extends from the first top surface to the first air outlet, the third top surface extends from the first top surface to the second air outlet, and the first top surface, the second top surface and the third top surface have different horizontal heights respectively.

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