Fan blade, fan and range hood

Abstract

The utility model provides a fan blade, fan and range hood, fan blade includes blade body and drainage structure, blade body has suction surface and pressure surface, the drainage structure protrudes from the pressure surface, a plurality of drainage structures are provided, the plurality of drainage structures are arranged in array along the array line direction, and the drainage structure is provided with the suction surface and the pressure surface. The number of the array lines is at least two, the at least two array lines are arranged in parallel in a spaced mode, the array lines are straight lines extending in the width direction of the pressure face, and the included angle between the array lines and the radial direction of the fan middle disc ranges from 30 degrees to 60 degrees. By arranging the multiple drainage structures along the array line, the low-speed boundary layer of the blade body is disturbed into turbulent flow with the high flow speed, backflow is not prone to being formed, meanwhile, the disturbed fluid high-speed flow area is larger, vortex on the suction surface can be weakened, flow loss is reduced, and the air volume and efficiency of a fan system are improved. In addition, the drainage structure enables fluid to reduce the frequency that airflow impacts the fan middle disc, and noise is reduced.

Description

Technical Field

[0001] The utility model relates to a fan blade, a fan and a range hood. Background Art

[0002] The multi-blade centrifugal fan is the main power system of the range hood, which is characterized by high flow rate, high pressure coefficient and low noise. When the range hood is working, the impeller of the multi-blade centrifugal fan converts the fluid from axial flow to radial flow. After entering the impeller, the fluid often undergoes a process of acceleration and discharge. If the flow field in the impeller flow channel is more turbulent or there are large vortices, the flow loss will increase and the fan efficiency will be reduced. The flow field is related to the blade structure, so redesigning the impeller blades is of great significance for optimizing product performance and improving user experience.

[0003] Most existing impeller blades use a single arc blade design. Some researchers have designed the blades to be double arcs and optimized the parameters of the double arc curve to increase flow and reduce flow losses. Other researchers have optimized the blade trailing edge structure, such as inclined trailing edge S-shaped blades, wavy trailing edges, and serrated trailing edges, which have certain effects on flow and noise. However, these works have not fundamentally solved the flow loss caused by the low-speed vortex of the blades, and the problem of the impeller vibrating and generating noise due to the diffusion of fluid on the pressure surface of the blades to both sides and the impact of the fixed disk (mainly the middle disk). Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect of unreasonable structure of impeller blades in the prior art, and to provide a fan blade, a fan and a range hood.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A fan blade, comprising a blade body and a drainage structure, the blade body having a suction surface and a pressure surface, the drainage structure protruding from the pressure surface, a plurality of drainage structures being provided, the plurality of drainage structures being arranged in an array along an array line direction, the number of array lines being at least two, at least two of the array lines being spaced apart and arranged in parallel, the array line being a straight line extending along the width direction of the pressure surface, and the array line being arranged at an angle of 30-60° with the radial direction of the fan mid-disk.

[0007] In this solution, multiple drainage structures are set along the array line to disturb the low-speed boundary layer of the blade body into a turbulent flow with a higher flow rate, so that it is not easy to form backflow. At the same time, the high-speed flow area of ​​the fluid after the disturbance is larger, which is conducive to weakening the vortex on the suction surface, thereby reducing flow losses and improving the air volume and efficiency of the fan system. In addition, the drainage structure is set on the pressure surface so that the fluid can be completely discharged and diffused to one side of the extension direction of the array line, thereby reducing the air flow to the fan disk, so as to reduce the number of times the airflow hits the fan disk, and correspondingly reduce the noise generated by the fan disk after being hit by the airflow, thereby reducing noise.

[0008] Preferably, the array lines are arranged at an angle of 45° along the radial direction of the wind turbine mid-disk.

[0009] In this solution, through the above-mentioned settings, the drainage effect of the drainage structure arranged in an array along the array line direction is further improved, the air flow rate flowing to the fan mid-disk is further reduced, and the noise is reduced accordingly.

[0010] Preferably, there are multiple array lines, wherein at least two of the multiple array lines are located on the first side of the fan disk, and at least two of the array lines are located on the second side of the fan disk, and the array lines located on the first side and the second side are perpendicular to each other.

[0011] In this scheme, through the above-mentioned setting, the number of drainage structures is increased by increasing the array lines. The drainage structures located on the first side and the second side can make the fluids from different directions diffuse and discharge from the same side of the blade body, reduce flow losses, and reduce the flow to the fan disk.

[0012] Preferably, the width of the drainage structure is 0.5-1.5 mm.

[0013] In this solution, the drainage effect of the drainage structure is ensured through the above-mentioned settings.

[0014] Preferably, the length of the drainage structure is 1-3 mm.

[0015] In this solution, the above-mentioned settings are used to ensure the flow diversion and flow stabilization effects of the diversion structure.

[0016] Preferably, the distance between two adjacent drainage structures located on the same array line is greater than two times and less than four times the length of the drainage structure.

[0017] In the present scheme, through the above-mentioned arrangement, the fluid is diffused from the drainage structure on one array line to the drainage structure on the other array line through the gap between the two adjacent drainage structures, and after the diffusion, the fluid is guided to the single-side edge of the blade body through the drainage structure on the other array line, which is beneficial to increase the flow rate of the fan system, thereby improving the efficiency of the fan system, while also reducing the pressure that impacts the fan disc and reducing the noise generated by pressure pulsation.

[0018] Preferably, the distance between two adjacent array lines is greater than the length of the drainage structure and less than the sum of the length of the drainage structure, the width of the drainage structure and the distance between two adjacent drainage structures on the same array line.

[0019] In this solution, the above arrangement is used to ensure the diffusion effect of the airflow, and compared with the arrangement of the two array lines being close together, the diffusion effect is better.

[0020] Preferably, the drainage structure is a rectangular structure, and a drainage surface is provided along the edges of the drainage structure in the length direction and the width direction, and the drainage surface is an arc-shaped structure.

[0021] In this solution, the drainage effect of the drainage structure is improved through the above-mentioned settings.

[0022] A fan comprises the fan blade as described above.

[0023] In this solution, the fan includes the above-mentioned fan blades, so that the fan disk noise is smaller than that of the traditional fan. In addition, the fan blades are used to disturb the flow, so that the low-speed boundary layer of the blade body is disturbed into a turbulent flow with a higher flow rate, so that it is not easy to form a backflow. At the same time, the high-speed flow area of ​​the fluid after the disturbance is larger, which is conducive to weakening the vortex on the suction surface, thereby reducing flow losses. The air volume and efficiency of the fan system are correspondingly improved.

[0024] A range hood comprises the fan as described above.

[0025] In this solution, the range hood includes the above-mentioned fan, so that the range hood produces less noise and has a higher efficiency in extracting oil fumes when in use.

[0026] The positive and progressive effect of the utility model is that the utility model sets a plurality of drainage structures along the array line to disturb the low-speed boundary layer of the blade body into a turbulent flow with a higher flow rate, so that it is not easy to form a backflow. At the same time, the high-speed flow area of ​​the fluid after the disturbance is larger, which is conducive to weakening the vortex on the suction surface, thereby reducing flow losses and improving the air volume and efficiency of the fan system. In addition, the drainage structure is set on the pressure surface so that the fluid can be completely discharged and diffused to one side of the extension direction of the array line, thereby reducing the air flow to the fan mid-disk, so as to reduce the number of times the airflow hits the fan mid-disk, and correspondingly reduce the noise generated by the fan mid-disk after being hit by the airflow, thereby reducing the noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a three-dimensional diagram of a range hood according to a preferred embodiment.

[0028] Figure 2 This is a three-dimensional diagram of a fan system according to a preferred embodiment of the present invention.

[0029] Figure 3 This is a diagram showing the position relationship between the fan disk and the blade body of a preferred embodiment of the utility model.

[0030] Figure 4 This is a diagram showing the position relationship between the array lines and the fan mid-plate of a preferred embodiment of the utility model.

[0031] Figure 5 This is a three-dimensional diagram of a blade body according to a preferred embodiment of the utility model.

[0032] Figure 6 This is a diagram showing the position relationship between two adjacent array lines in a preferred embodiment of the present invention.

[0033] Figure 7 It is a schematic diagram of the spoiler of the drainage structure of a preferred embodiment of the utility model.

[0034] Figure 8 It is a schematic diagram of air flow loss of a preferred embodiment of the utility model.

[0035] Description of reference numerals:

[0036] Blade body 10

[0037] Suction surface 11

[0038] Pressure surface 12

[0039] Drainage structure 20

[0040] Array Line 21

[0041] Guide surface 22

[0042] Fan center disk 30

[0043] Range hood 100

[0044] Fan system 200 DETAILED DESCRIPTION

[0045] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0046] This embodiment provides a fan blade, the specific structure of which is as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the fan blade includes a blade body 10 and a drainage structure 20, the blade body 10 has a suction surface 11 and a pressure surface 12, the drainage structure 20 is protruded from the pressure surface 12, and there are multiple drainage structures 20, and the multiple drainage structures 20 are arranged in an array along the direction of the array line 21. There are at least two array lines 21, and at least two array lines 21 are spaced and arranged in parallel. The array line 21 is a straight line extending along the width direction of the pressure surface 12, and the array line 21 is set at an angle of 30-60° with the radial direction of the fan mid-disk 30.

[0047] Specifically, the blade body 10 is a plate, and the cross-section of the blade body 10 is an arc-shaped structure. The blade body 10 is made of sheet metal, wherein the side of the blade body 10 away from the opening of the arc-shaped structure is the suction surface 11, and the side facing the opening of the arc-shaped structure is the pressure surface 12, that is, the side of the blade body 10 facing the fan disk 30 is the pressure surface 12, and a plurality of drainage structures 20 are protrudingly provided on the pressure surface 12. The drainage structure 20 is made by a stamping method in the prior art. The plurality of drainage structures 20 are arranged in an array along an array line 21. The array line 21 is a straight line extending in the width direction of the pressure surface 12, and at least two array lines 21 are provided. The two array lines 21 are parallel and spaced apart to form a blade on the pressure surface 12 in which a plurality of drainage structures 20 are arranged in an array along at least two array lines 21. The drainage structure 20 protruding from the pressure surface 12 is used to disturb the low-speed boundary layer of the blade body 10 into a turbulent flow with a higher flow velocity, so that backflow is not easily formed. It can be understood that, if Figure 7 and Figure 8As shown, due to the protrusion on the pressure surface 12, the airflow angle becomes smaller, so that the airflow will be disturbed when passing through the flow channel with the protrusion, resulting in a local increase in velocity and pressure change. This disturbance will cause the fluid movement to become irregular, thereby forming turbulence. The formation of turbulence can be attributed to the irregularities and unevenness encountered by the fluid during the flow process. At the same time, the high-speed flow area of ​​the fluid after the disturbance is larger than that of the pressure surface 12 without the drainage structure 20, which is conducive to reducing the vortex of the suction surface 11, thereby reducing flow losses and improving the air volume and efficiency of the fan system 200.

[0048] In addition, the array line 21 is arranged at an angle of 30-60° along the radial direction of the fan disk 30, so that the drainage structure 20 is arranged on the pressure surface 12 so that the fluid can be completely discharged and diffused to one side of the extension direction of the array line 21, that is, the fluid originally flowing out from both sides of the blade body 10 becomes a single-side outflow, so that the airflow is guided out of the blade body 10 along the extension direction of the array line 21, thereby reducing the airflow flow to the fan disk 30, so as to reduce the number of times the airflow impacts the fan disk 30, and correspondingly reduce the situation where the fan disk 30 is impacted by the airflow to generate noise, thereby reducing noise. It can be understood that at least two array lines 21 allow the fluid to be drained through the drainage structure 20 arranged on the second array line 21 after passing through the first array line 21, so as to avoid the situation where the fluid accumulates and cannot be completely discharged.

[0049] In this embodiment, the array line 21 is set at an angle of 45° with the radial direction of the fan disk 30. By setting the array line 21 at an angle of 45° with the radial direction of the fan disk 30, according to the results of the fluid distribution test using finite element software in the prior art, it is found that when the angle is 45°, the efficiency of the fluid, that is, the airflow flowing out of the blade body 10 is higher, the drainage effect is better, the airflow to the fan disk 30 is further reduced, and the noise is correspondingly reduced.

[0050] In this embodiment, a plurality of array lines 21 are provided, wherein at least two array lines 21 among the plurality of array lines 21 are located on the first side of the wind turbine mid-disk 30, and at least two array lines 21 are located on the second side of the wind turbine mid-disk 30, and the array lines 21 located on the first side and the second side are perpendicular to each other.

[0051] Specifically, a plurality of array lines 21 are respectively located on the first side and the second side of the fan disk 30, and the array lines 21 located on the first side and the second side of the fan disk 30 are arranged at an angle of 45° with the radial direction of the fan disk 30, that is, the array lines 21 located on the first side and the second side of the fan disk 30 are arranged at an angle, and the angle is 90°. This embodiment is described by assuming that there are four array lines 21 located on the first side of the fan disk 30 and three array lines 21 located on the second side of the fan disk 30. The four array lines 21 are arranged perpendicularly relative to the three array lines 21, and the number of drainage structures 20 is increased by increasing the number of array lines 21. At the same time, when the number of array lines 21 increases, the drainage effect of the airflow when being drained by the drainage structures 20 arranged in an array is better. The drainage structures 20 located on the first side and the second side and arranged in an array along the array lines 21 can make the fluids from different directions diffuse and discharge from the same side of the blade body 10, reduce flow loss, and reduce the flow to the fan disk 30.

[0052] In this embodiment, the width of the drainage structure 20 is 0.5-1.5 mm.

[0053] Specifically, the drainage structure 20 is a rectangular structure, which is protruded from the surface of the pressure surface 12 to bear the fluid load through the width of the drainage structure 20 , thereby ensuring the drainage effect of the drainage structure 20 .

[0054] Furthermore, the length of the drainage structure 20 is 1-3 mm. By limiting the length of the drainage structure 20, while ensuring the drainage effect of the drainage structure 20, the length of the drainage structure 20 is used to stabilize the flow of the fluid, so that the fluid can flow along the length direction of the drainage structure 20. The width of the drainage structure 20 is represented by a, and the length is represented by b.

[0055] In this embodiment, the spacing between two adjacent drainage structures 20 located on the same array line 21 is greater than two times and less than four times the length of the drainage structure 20. That is, the spacing between two adjacent drainage structures 20 along the extension direction of the array line 21 is c, where 2b<c<4b. By setting a gap between two adjacent drainage structures 20 to diffuse the fluid from the drainage structure 20 on one array line 21 to the drainage structure 20 on another array line 21, and after diffusion, the fluid is guided to the single-side edge of the blade body 10 through the drainage structure 20 on the other array line 21, which is beneficial to improve the flow rate of the fan system 200, thereby improving the efficiency of the fan system 200, and at the same time reducing the pressure impacting the fan mid-disk 30 and reducing the noise generated by pressure pulsation.

[0056] In this embodiment, the spacing between two adjacent array lines 21 is greater than the length of the drainage structure 20 and less than the sum of the length of the drainage structure 20, the width of the drainage structure 20, and the spacing between two adjacent drainage structures 20 located on the same array line 21. Among them, the spacing between two adjacent array lines 21 is d, that is, b<d<a+b+c. It can be understood that the value range of d can be obtained by substituting the value range of a of 0.5-1.5mm, the value range of b of 1-3mm, and the value range of c of 2b<c<4b. By setting a spacing between two adjacent array lines 21, the diffusion effect of the airflow is better than the method of setting the two array lines 21 close to each other.

[0057] In this embodiment, the drainage structure 20 is a rectangular structure, and a guide surface 22 is provided along the edges of the length direction and the width direction of the drainage structure 20. The guide surface 22 is an arc-shaped structure. By providing the arc-shaped guide surface 22 on the edges of the drainage structure 20 in various directions, the drainage effect when the fluid contacts the drainage structure 20 is improved. In addition, the guide surface 22 further reduces the airflow angle, effectively achieving disturbance to the fluid.

[0058] This embodiment also provides a fan, which includes the above-mentioned fan blades. The fan includes the above-mentioned fan blades, so that the fan disk 30 has lower noise than the traditional fan. In addition, the fan blades are used to disturb the flow, so that the low-speed boundary layer of the blade body 10 is disturbed into a turbulent flow with a higher flow rate, so that it is not easy to form a backflow. At the same time, the high-speed flow area of ​​the fluid after the disturbance is larger, which is conducive to weakening the vortex of the suction surface 11, thereby reducing the flow loss. The air volume and efficiency of the fan system 200 are correspondingly improved.

[0059] The present embodiment further provides a range hood 100, which includes the above-mentioned fan. The range hood 100 includes the above-mentioned fan, so that the range hood 100 has lower noise and higher oil fume extraction efficiency when in use.

[0060] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A fan blade, characterized in that: The fan blade includes a blade body and a drainage structure, the blade body has a suction surface and a pressure surface, the drainage structure is protruded from the pressure surface, and there are multiple drainage structures, and the multiple drainage structures are arranged in an array along the array line direction. There are at least two array lines, and at least two array lines are spaced and arranged in parallel. The array line is a straight line extending along the width direction of the pressure surface, and the array line is set at an angle of 30-60° with the radial direction of the fan disk.

2. The fan blade according to claim 1, characterized in that: The array lines are arranged at an angle of 45° with respect to the radial direction of the fan center disk.

3. The fan blade according to claim 2, characterized in that: There are multiple array lines, wherein at least two of the multiple array lines are located on the first side of the fan disk, and at least two of the array lines are located on the second side of the fan disk, and the array lines located on the first side and the second side are perpendicular to each other.

4. The fan blade according to claim 3, characterized in that: The width of the drainage structure is 0.5-1.5 mm.

5. The fan blade according to claim 4, characterized in that: The length of the drainage structure is 1-3 mm.

6. The fan blade according to claim 5, characterized in that: The distance between two adjacent drainage structures on the same array line is greater than two times and less than four times the length of the drainage structure.

7. The fan blade according to claim 6, characterized in that: The distance between two adjacent array lines is greater than the length of the drainage structure and less than the sum of the length of the drainage structure, the width of the drainage structure and the distance between two adjacent drainage structures on the same array line.

8. The fan blade according to claim 1, characterized in that: The drainage structure is a rectangular structure, and a drainage surface is arranged along the edges of the drainage structure in the length direction and the width direction, and the drainage surface is an arc-shaped structure.

9. A fan, characterized in that: The wind fan comprises the wind fan blade according to any one of claims 1-8.

10. A range hood, characterized in that: The range hood comprises the fan as claimed in claim 9.

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