Centrifugal fan blade, fan and air conditioner indoor unit

Abstract

The application provides a centrifugal fan blade, a fan and an air conditioner indoor unit. A bottom plate and blades are provided. The blades are arranged at intervals along the periphery of the bottom plate to form an annular structure. The blades have an inlet section and an outlet section connected to each other. The outlet section is located on the side of the edge of the inlet section close to the bottom plate. The inlet section and the outlet section are both arc-shaped structures. The connection between the inlet section and the outlet section forms a connection end. The tangent of the inlet section at the connection end is L5, the tangent of the outlet section at the connection end is L6, the included angle between L5 and L6 is γ, and 160°≤γ≤165°. The technical scheme provided by the application can solve the technical problem of low airflow work efficiency of the centrifugal fan blade in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal fan blades, in particular to a centrifugal fan blade, a fan and an air conditioner indoor unit. BACKGROUND

[0002] At present, centrifugal fan blades are widely used in various air conditioning devices, especially in dehumidifiers, air purifiers and cabinet air conditioners. The centrifugal fan blade, the volute and the motor form a complete fan. The centrifugal fan blade is the most important working part. When the motor drives the centrifugal fan blade to rotate at high speed, the air in the volute is thrown out of the centrifugal fan blade under the action of centrifugal force, and is discharged from the air outlet of the volute. At this time, the negative pressure is generated around the centrifugal fan blade due to the air being thrown out, so that the external air is continuously supplemented from the air inlet of the volute.

[0003] However, the centrifugal fan blade in the prior art has low airflow working efficiency, high noise and small output air volume. When a large air volume is required, the motor needs to rotate at a high speed, which consumes a large amount of energy. SUMMARY

[0004] The main purpose of the present application is to provide a centrifugal fan blade, a fan and an air conditioner indoor unit to solve the technical problem of low airflow working efficiency of the centrifugal fan blade in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a centrifugal fan blade is provided, comprising: a bottom plate and a plurality of blades, the plurality of blades are arranged at intervals along the periphery of the bottom plate to form an annular structure; the blade has an inlet section and an outlet section connected to each other, the outlet section is located on the side of the edge of the inlet section close to the bottom plate, the inlet section and the outlet section are both arc-shaped structures, and the connection between the inlet section and the outlet section forms a connection end; wherein the tangent of the inlet section at the connection end is L5, the tangent of the outlet section at the connection end is L6, the included angle between L5 and L6 is γ, and 160°≤γ≤165°.

[0006] Further, the end of the inlet section away from the outlet section forms an inlet end, and a plurality of inlet ends surround an inner circular ring; the tangent of one inlet end to the circle where the inner circular ring is located is L1, the tangent of the inlet section at the inlet end is L2, the included angle between L1 and L2 is α, and 60°≤α≤70°.

[0007] Further, the end of the outlet section away from the inlet section forms an outlet end, and a plurality of outlet ends surround an outer circular ring; the tangent of one outlet end to the circle where the outer circular ring is located is L3, the tangent of the outlet section at the outlet end is L4, the included angle between L3 and L4 is β, and 150°≤β≤170°.

[0008] Further, the inlet section forms an inlet end at an end away from the outlet section, and the plurality of inlet ends enclose an inner circular ring, a circle on which the inner circular ring is located has a diameter D1; the outlet section forms an outlet end at an end away from the inlet section, and the plurality of outlet ends enclose an outer circular ring, a circle on which the outer circular ring is located has a diameter D2; 0.8≤D1 / D2≤0.88.

[0009] Further, the number of the blades is Z, and 50≤Z≤60.

[0010] Further, the inlet section forms an inlet end at an end away from the outlet section, and the distance between the inlet ends of two adjacent blades is d1, and 11.5mm≤d1≤15mm.

[0011] Further, the outlet section forms an outlet end at an end away from the inlet section, and the distance between the outlet ends of two adjacent blades is d2, and 10mm≤d2≤13mm.

[0012] Further, the outlet section forms an outlet end at an end away from the inlet section, and the plurality of outlet ends enclose an outer circular ring; a tangent of the circle on which the outer circular ring is located is L3, a tangent of the outlet end of the outlet section is L4, and the included angle between L3 and L4 is β; wherein, α=65°; and / or, β=156°; and / or, γ=162°.

[0013] Further, the number of the blades is Z, and Z=54; and / or, the distance between the inlet ends of two adjacent blades is d1, and d1=13mm; and / or, the distance between the outlet ends of two adjacent blades is d2, and d2=11.5mm.

[0014] According to another aspect of the present application, a fan is provided, the fan comprising a centrifugal fan blade, a volute and a motor, the centrifugal fan blade and the motor being installed in the volute, the motor being connected with the centrifugal fan blade, and the centrifugal fan blade being the centrifugal fan blade provided above.

[0015] According to another aspect of the present application, an air conditioner indoor unit is provided, the air conditioner indoor unit comprising an indoor unit shell and a fan, the fan being installed in the indoor unit shell, and the fan being the fan provided above.

[0016] By setting γ in the above range, the angle between the inlet section and the outlet section is changed, the blade shape is optimized, the airflow flow condition between the blades is improved, the airflow volume between the blades is increased, the blade's doing function on the airflow is enhanced, and the efficiency of the centrifugal fan blade is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the illustrative embodiments of the present application and their descriptions, and do not constitute improper limitations to the present application. In the drawings:

[0018] Figure 1 A schematic diagram showing the inlet angle of the blade according to the embodiment one of the present application is shown;

[0019] Figure 2 A schematic diagram showing the outlet angle of the blade according to the embodiment one of the present application is shown;

[0020] Figure 3 A schematic diagram showing the skew angle of the blade according to the embodiment one of the present application is shown;

[0021] Figure 4 A schematic diagram showing d1 and d2 according to the embodiment one of the present application is shown;

[0022] Figure 5 A schematic diagram showing the position of the inner and outer rings according to the embodiment one of the present application is shown;

[0023] Figure 6 A schematic diagram showing the structure of the centrifugal fan blade according to the embodiment one of the present application is shown;

[0024] Figure 7 A schematic diagram showing the structure of the centrifugal fan according to the embodiment two of the present application is shown;

[0025] Figure 8 A sectional view of the centrifugal fan according to the embodiment two of the present application is shown;

[0026] Figure 9 A schematic diagram showing the noise level of the centrifugal fan blade according to the embodiment one of the present application is shown;

[0027] Figure 10 A schematic diagram showing the power level of the centrifugal fan blade according to the embodiment one of the present application is shown;

[0028] Figure 11 A diagram showing the inter-blade flow field of the centrifugal fan blade in the prior art is shown;

[0029] Figure 12 A diagram showing the inter-blade flow field of the centrifugal fan blade according to the embodiment one of the present application is shown.

[0030] Wherein, the above figures include the following reference signs:

[0031] 10, centrifugal fan blade; 11, bottom plate; 12, blade; 121, inlet section; 122, outlet section; 20, volute; 30, motor; 31, motor shaft; 40, mounting plate. DETAILED DESCRIPTION

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 8 As shown, Embodiment 1 of the present invention provides a centrifugal fan blade 10, which includes a base plate 11 and blades 12. Multiple blades 12 are spaced apart along the periphery of the base plate 11 to form a ring structure. Each blade 12 has an inlet section 121 and an outlet section 122 connected to each other. The inlet section 121 is arc-shaped, and the outlet section 122 is located on the side of the inlet section 121 closest to the edge of the base plate 11. The end of the inlet section 121 away from the outlet section 122 forms an inlet end, and the multiple inlet ends form an inner ring. Specifically, in this embodiment, both the inlet section 121 and the outlet section 122 are arc-shaped. The connection point between the inlet section 121 and the outlet section 122 forms a connecting end. The tangent of the inlet section 121 at the connecting end is L5, and the tangent of the outlet section 122 at the connecting end is L6. The included angle between L5 and L6 is γ (γ is also called the deflection angle of the blade 12), 160°≤γ≤165°. Specifically, in this embodiment, the center of the inner ring is the axis of the centrifugal fan blade 10.

[0034] By using the centrifugal fan blade provided in this embodiment, and by setting γ within the aforementioned angle range, the work capacity of the pressure surface of the blade 12 can be increased, the blade shape of the fan blade can be further optimized, the deflection angle of the entire blade 12 can be increased, and the work capacity of the blade 12 on the airflow can be enhanced, thereby improving the efficiency of the centrifugal fan blade 10.

[0035] Specifically, in this embodiment, the end of the inlet segment 121 furthest from the outlet segment forms the inlet end. The tangent line between the inlet end and the circle containing the inner ring is L1, and the tangent line of the inlet segment 121 at the inlet end is L2. The included angle between L1 and L2 is α, where 60°≤α≤70°. In this embodiment, α can be referred to as the inlet angle.

[0036] By using the centrifugal fan blade 10 provided in this embodiment, and by setting α within the above-mentioned angle range, the blade shape can be optimized, the airflow between the blades 12 can be improved, the airflow between the blades 12 can be increased, and the work capacity of the blades 12 on the airflow can be enhanced, thereby improving the efficiency of the centrifugal fan blade 10.

[0037] In the embodiment, the outlet section 122 is arc-shaped, the outlet section 122 forms an outlet end at an end of the outlet section 122 away from the inlet section 121, and a plurality of outlet ends enclose an outer circle; an outlet end and a tangent of a circle where the outer circle is located are L3, a tangent of the outlet section 122 at the outlet end is L4, and an included angle between L3 and L4 is β (an outlet angle), 150°≤β≤170°. By setting β in the above range, the blade shape can be optimized, the airflow flow condition between the blades 12 can be improved, the airflow volume between the blades 12 can be increased, and the blade 12 can be enhanced to improve the efficiency of the centrifugal fan blade 10. Specifically, the center of the outer circle in the embodiment is the shaft center of the centrifugal fan blade 10.

[0038] In the embodiment, the diameter of the circle where the inner circle is located is D1, the outlet section 122 forms an outlet end at an end of the outlet section 122 away from the inlet section 121, a plurality of outlet ends enclose an outer circle, the diameter of the circle where the outer circle is located is D2, and 0.8≤D1 / D2≤0.88. By setting the ratio in the above range, the airflow flow condition between the blades 12 can be improved, the airflow volume between the blades 12 can be increased, and the blade 12 can be enhanced to improve the efficiency of the centrifugal fan blade 10.

[0039] Specifically, the number of blades 12 in the embodiment is Z, and 50≤Z≤60. By setting the number of blades 12 in the above range, the number of blades 12 can be rationalized, the flow separation between the blades 12 can be reduced, and the ventilation volume between the blades 12 can be increased. The number of blades 12 is an important parameter directly related to the aerodynamic performance of the fan, too few blades 12 can cause secondary vortex flow in the flow passage of the centrifugal fan blade 10, and too many blades 12 can reduce the effective flow area of the gas, intensify the impact loss and friction loss at the inlet of the centrifugal fan blade 10, and increase the load of the centrifugal fan blade 10, thereby reducing the total pressure and efficiency of the fan.

[0040] In the embodiment, the distance between the inlet ends of two adjacent blades 12 is d1, and 11.5mm≤d1≤15mm. By setting the distance between the inlet ends of two adjacent blades 12 in the above range, the airflow flow condition between the blades 12 can be improved, the airflow volume between the blades 12 can be increased, and the blade 12 can be enhanced to improve the efficiency of the centrifugal fan blade 10.

[0041] Specifically, the outlet section 122 in the embodiment forms an outlet end at an end of the outlet section 122 away from the inlet section 121, and the distance between the outlet ends of two adjacent blades 12 is d2, 10mm≤d2≤13mm. With such a structure, by setting the distance between the outlet ends of two adjacent blades 12 within the above range, the airflow flow condition between the blades 12 can be improved, the airflow volume between the blades 12 can be increased, and the work done by the blades 12 on the airflow can be enhanced, so as to improve the efficiency of the centrifugal fan blade 10.

[0042] In the embodiment, the connection end is formed at the connection between the inlet section 121 and the outlet section 122, the tangent line of the inlet section 121 at the connection end is L5, the tangent line of the outlet section 122 at the connection end is L6, and the included angle between L5 and L6 is γ; wherein, α=65°; and / or, β=156°; and / or, γ=162°.

[0043] Preferably, in the embodiment, α=65°, β=156°, and γ=162°. With such a structure, the airflow flow condition between the blades 12 can be better improved, the airflow volume between the blades 12 can be increased, the work done by the blades 12 on the airflow can be enhanced, and the efficiency of the centrifugal fan blade 10 can be improved.

[0044] Specifically, the number of blades 12 is Z, Z=54; and / or, the distance between the inlet ends of two adjacent blades 12 is d1, d1=13mm; and / or, the distance between the outlet ends of two adjacent blades 12 is d2, d2=11.5mm.

[0045] Preferably, in the embodiment, d1=13mm and d2=11.5mm. With such a structure, the airflow flow condition can be further optimized, the airflow volume between the blades 12 can be better increased, the work done by the blades 12 on the airflow can be better enhanced, and the efficiency of the centrifugal fan blade 10 can be better improved.

[0046] As shown in Figure 9 and Figure 10 It can be seen that the optimized centrifugal fan blade 10 can effectively improve the airflow passing capacity. Figure 11 and Figure 12Compared with the contrast, the flow field diagram before and after optimization is compared, the airflow passing ability between the blades 12 of the optimized centrifugal fan blade 10 is strong, the vortex area between the blades 12 is obviously reduced (corresponding to the position of the upper left corner in the figure), and the reduction of the vortex between the blades 12 can significantly reduce the aerodynamic noise of the centrifugal fan blade 10. The reduction of the vortex between the blades 12 of the centrifugal fan blade 10 designed by the application can significantly reduce the starting noise of the centrifugal fan blade 10. By optimizing the blade 12 shape, the airflow from the axial direction of the centrifugal fan blade 10 into the impeller to the radial direction into the blade 12 of the centrifugal fan blade 10 is smoother, the blade 12 deflection angle increases the work function of the pressure surface of the blade 12, and the efficiency of the centrifugal fan is improved.

[0047] Embodiment two of the application provides a fan, the fan comprising a centrifugal fan blade 10, a volute 20 and a motor 30, the centrifugal fan blade 10 and the motor 30 are both installed in the volute 20, the motor 30 is connected with the centrifugal fan blade 10, and the centrifugal fan blade 10 is the centrifugal fan blade 10 provided in the above-mentioned embodiment. Specifically, the centrifugal fan blade 10 is installed inside the volute 20, the motor 30 is fixed on the mounting plate 40, the motor shaft 31 mounting hole of the centrifugal fan blade 10 is fixed on the motor 30 through the motor shaft 31, and then the motor 30 is installed and fixed on the volute 20, that is, the assembly of the centrifugal fan is completed. The motor mounting position is provided on the bottom plate 11 of the centrifugal fan blade 10, the motor mounting position is provided with a heat dissipation hole, and the heat dissipation hole is used for heat dissipation of the motor 30.

[0048] Embodiment three of the application provides an air conditioner indoor unit, the air conditioner indoor unit comprising an indoor unit shell and a fan, the fan is installed in the indoor unit shell, and the fan is the fan provided in the above-mentioned embodiment.

[0049] From the above description, it can be seen that the above-mentioned embodiments of the application achieve the following technical effects: increasing the work efficiency of the centrifugal fan blade on the airflow, reducing the noise, and reducing the motor speed and power consumption required under the condition of achieving the same air volume.

[0050] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0051] The foregoing description, for purposes of clarity, describes the present application in terms of its components, processes and operations. Such descriptions and representations are the means used by those skilled in the art of describing the physical structure, configuration and operation of implementations of the application in the best mode contemplated for carrying out the application. However, the application should not be construed as limited to the descriptions and representations used because the purposed described herein can be produced by other equally effective components, processes, acts, structures, functionality, maps, and / or structures. In fact, the skilled artisan will recognize from the disclosure herein, that any components, processes, acts, structures, functionality, maps, and / or structures similar or equivalent to those described herein can be employed in the practice of the application without departing from the scope of the present application.

[0052] In the description of the present application, it is to be understood that the specific location or position relationships indicated by the orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of contrary description, these orientation words do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of the components themselves.

[0053] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0054] In addition, it should be noted that the use of the words "first", "second" and the like to describe various components is merely intended to distinguish the corresponding components, and the words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0055] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A centrifugal fan blade, characterized in that, include: The base plate (11) and blades (12) are provided, wherein there are multiple blades (12), and the multiple blades (12) are arranged at intervals along the periphery of the base plate (11) to form a ring structure. A connecting ring is provided, and the side of each of the multiple blades (12) away from the base plate (11) is connected to the connecting ring. The connecting ring has an inner ring and an outer ring arranged opposite to each other, and the blades (12) are all installed in the inner ring of the connecting ring. The blade (12) has an inlet section (121) and an outlet section (122) connected to each other. The outlet section (122) is located on the side of the inlet section (121) near the edge of the base plate (11). Both the inlet section (121) and the outlet section (122) are arc-shaped structures. The connection between the inlet section (121) and the outlet section (122) forms a connection end. Wherein, the tangent of the inlet section (121) at the connection end is L5, the tangent of the outlet section (122) at the connection end is L6, the included angle between L5 and L6 is γ, 160°≤γ≤165°; The end of the inlet section (121) away from the outlet section (122) forms an inlet end, and multiple inlet ends form an inner ring; the tangent of one inlet end to the circle containing the inner ring is L1, the tangent of the inlet section (121) at the inlet end is L2, and the included angle between L1 and L2 is α, 60°≤α<70°; The outlet section (122) is located away from the inlet section (121) and forms an outlet end. Multiple outlet ends form an outer ring. The tangent of one outlet end to the circle containing the outer ring is L3, and the tangent of the outlet section (122) at the outlet end is L4. The included angle between L3 and L4 is β, where 150°≤β≤156°.

2. The centrifugal fan blade according to claim 1, characterized in that, The diameter of the circle containing the inner ring is D1; ​​the diameter of the circle containing the outer ring is D2; 0.8≤D1 / D2≤0.

88.

3. The centrifugal fan blade according to claim 1, characterized in that, The number of blades (12) is Z, where 50 ≤ Z ≤ 60.

4. The centrifugal fan blade according to claim 1, characterized in that, The distance between the inlet ends of two adjacent blades (12) is d1, 11.5mm≤d1≤15mm.

5. The centrifugal fan blade according to claim 1, characterized in that, The distance between the outlet ends of two adjacent blades (12) is d2, 10mm≤d2≤13mm.

6. The centrifugal fan blade according to claim 1, characterized in that, The tangent of the outlet end to the circle containing the outer ring is L3, the tangent of the outlet segment (122) at the outlet end is L4, and the included angle between L3 and L4 is β; Where α = 65°; and / or, β = 156°; and / or, γ = 162°.

7. The centrifugal fan blade according to claim 3, characterized in that, The number of leaves (12) is Z, Z = 54; and / or, The distance between the inlet ends of two adjacent blades (12) is d1, where d1 = 13 mm; and / or, The distance between the outlet ends of two adjacent blades (12) is d2, where d2 = 11.5 mm.

8. A fan, characterized in that, The fan includes a centrifugal fan blade, a volute, and a motor. The centrifugal fan blade and the motor are both installed inside the volute. The motor is connected to the centrifugal fan blade. The centrifugal fan blade is the centrifugal fan blade according to any one of claims 1 to 7.

9. An indoor unit for an air conditioner, characterized in that, The air conditioner indoor unit includes an indoor unit housing and a fan, the fan being installed inside the indoor unit housing, and the fan being the fan described in claim 8.

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