Cooling fan

Abstract

The utility model relates to the technical field of hot air fans, and discloses a cooling fan which comprises a hub and a plurality of fan blades, the fan blades are arranged in a surrounding and butt joint mode along the hub, each fan blade comprises a free end and a fixed end, and the fixed ends and the hub are arranged in a butt joint mode. The free end is provided with a first upper chord and a first lower chord, the fixed end is provided with a second upper chord and a second lower chord, and the chord length ratio of the second upper chord to the first upper chord is 0.13-0.22; the axial length of the hub is L, fan arc lines are formed at the two ends of the section of each fan blade, the included angle formed by the projection of the fan arc lines and the axial length L is a fan angle, and the angle range of the fan angle is 16-38 degrees. Through the optimal proportion of the free end and the fixed end, under the same power, the air volume generated by the cooling fan is larger, the cooling effect of the cooling fan is improved, the fan angle is limited, the noise reduction effect is achieved, the centrifugal force of fan blade rotation can be controlled, airflow is concentrated right in front of an air outlet, the air supply distance and air pressure are increased, and the air supply efficiency is improved. And the heat dissipation effect of the heat dissipation fan is further improved.

Description

Technical Field

[0001] The utility model patent relates to the technical field of heat dissipation fans, and specifically, to heat dissipation fans. Background Art

[0002] Cooling fans are currently the main heat dissipation components and are commonly used to dissipate heat in computer units such as CPUs, power supplies, and motherboards.

[0003] The air volume and air pressure of a cooling fan are one of the core indicators for measuring the performance of a cooling fan. At the same time, a fan that achieves low noise operation with a lower speed or excellent aerodynamic structure design is another important parameter for measuring fan performance.

[0004] For example, a prior patent with publication number CN 214404093 U discloses a cooling fan, including a hub and a plurality of blades radially distributed around the hub, the blades including a free end and a fixed end, the fixed end being connected to the hub, a front edge and a rear edge being arranged between the free end and the fixed end; the free end is provided with a first upper chord and a first lower chord connected end to end, the fixed end is provided with a second upper chord and a second lower chord, and a chord length ratio of the second upper chord to the first upper chord is between 0.3155 and 0.4242.

[0005] In the prior art, the optimization of the chord length data and curvature data of the cooling fan is still insufficient, the air volume under the same power still needs to be optimized, and the cooling effect is insufficient. Utility Model Content

[0006] The utility model aims to provide a heat dissipation fan, aiming to solve the problem of insufficient heat dissipation effect of the heat dissipation fan in the prior art.

[0007] The utility model is implemented as follows: a cooling fan comprises a hub and a plurality of blades, wherein the blades are arranged in a circumferential interval along the hub and are butt-jointed with the hub, the blades comprise a free end and a fixed end, and the fixed end is butt-jointed with the hub; the free end has a first upper chord and a first lower chord, the fixed end has a second upper chord and a second lower chord, and the chord length ratio of the second upper chord to the first upper chord is between 0.13 and 0.22; the axial length of the hub is L, and the two ends of the cross section of the blade form a fan arc line, and the angle formed by the projection of the fan arc line with the axial length L is the fan angle, and the angle range of the fan angle is between 16° and 38°.

[0008] Furthermore, along the direction from the fixed end to the free end, the angle of the fan angle is gradually reduced.

[0009] Furthermore, the free end has a free cross-section, and the free cross-section includes a first side chord, a second side chord, the first upper chord and the first lower chord, the first side chord and the second side chord are arranged correspondingly on both sides, the two ends of the first side chord are respectively connected to one end of the first upper chord and one end of the first lower chord, and the two ends of the second side chord are respectively connected to the other end of the first upper chord and the other end of the first lower chord; the fan arc line is formed between the middle part of the first side chord and the middle part of the second side chord, and the fan angle corresponding to the free cross-section is 16°.

[0010] Furthermore, when the cooling fan is arranged horizontally, along the axial direction of the hub, a blade wheelbase is formed between the upper and lower parts of the fan blades, and a hub wheelbase is formed in the axial direction of the hub, and the ratio of the blade wheelbase to the hub wheelbase is greater than 90%.

[0011] Furthermore, the fixed end has a fixed cross-section, the upper part of the fixed cross-section forms the second upper chord, the lower part of the fixed cross-section forms the second lower chord, and the two ends of the second upper chord are respectively arranged one-to-one with the two ends of the second lower chord to form two middle chord portions, the fan arc line is formed between the two middle chord portions, and the fan angle corresponding to the fixed cross-section is 38°.

[0012] Furthermore, along the direction from the fixed end to the free end, the fan blades are arranged in a twisted arc, and the twist angle of the fan blades is between 21° and 23°.

[0013] Furthermore, along the direction from the fixed end to the free end, the fan blades are arranged in a twisted arc shape, and the twist angle of the fan blades is 22°.

[0014] Furthermore, the chord length of the first upper chord is between 48 and 52 mm, and the chord length of the second upper chord is between 7 and 11 mm.

[0015] Furthermore, the chord length of the first upper chord is 50 mm, and the chord length of the second upper chord is 9 mm.

[0016] Furthermore, the wheel hub has a hub shell, and the fan blades are arranged in a circumferential and corresponding manner along the hub shell, and the fan blades are integrally formed with the hub shell; the hub shell has a hub plate, and the hub plate is arranged in a transparent state.

[0017] Compared with the prior art, the cooling fan provided by the utility model has an optimized ratio of the free end and the fixed end. Under the same power, the cooling fan generates a larger air volume and can maintain the same noise level, thereby improving the cooling effect of the cooling fan. At the same time, the angle of the fan is limited, which has a noise reduction effect, and can control the centrifugal force of the rotation of the fan blades, so that the airflow is concentrated in the columnar space directly in front of the air outlet, thereby increasing the air supply distance and wind pressure, and further improving the cooling effect of the cooling fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the heat dissipation fan provided by the utility model;

[0019] Figure 2 It is a schematic plan view of a free cross section of the heat dissipation fan provided by the utility model;

[0020] Figure 3 It is a cross-sectional schematic diagram of the heat dissipation fan provided by the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0023] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present utility model, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] Reference Figure 1-3 As shown, it is a preferred embodiment provided by the utility model.

[0025] A cooling fan comprises a hub 1 and a plurality of blades 2, wherein the blades 2 are arranged in a circumferentially spaced correspondence along the hub 1, and the blades 2 are butt-jointed with the hub 1, the blades 2 comprise a free end and a fixed end, and the fixed end is butt-jointed with the hub 1; the free end has a first upper chord 21 and a first lower chord 22, the fixed end has a second upper chord and a second lower chord, and the chord length ratio of the second upper chord to the first upper chord 21 is between 0.13 and 0.22; the axial length of the hub 1 is L, and two ends of the cross section of the blade 2 form a fan arc line 23, and the angle formed by the projection of the fan arc line 23 with the axial length L is the fan angle, and the angle range of the fan angle is between 16° and 38°.

[0026] The above-mentioned cooling fan, through the optimized ratio of the free end and the fixed end, can generate a larger air volume under the same power and can maintain the same noise level, thereby improving the cooling effect of the cooling fan. At the same time, the angle of the fan is limited, which plays a noise reduction role, and can control the centrifugal force of the rotation of the fan blade 2, so that the airflow is concentrated in the columnar space directly in front of the air outlet, increasing the air supply distance and wind pressure, and further improving the cooling effect of the cooling fan.

[0027] The angle of the fan angle is gradually reduced from the fixed end to the free end; the centrifugal force of the rotation of the fan blade 2 can be controlled to concentrate the airflow in the columnar space directly in front of the air outlet, increase the air supply distance and wind pressure, and improve the heat dissipation effect of the cooling fan.

[0028] At the same time, the angle of the fan is gradually reduced, which has a noise reduction effect.

[0029] The free end has a free cross-section, which includes a first side chord, a second side chord, a first upper chord 21 and a first lower chord 22. The first side chord and the second side chord are arranged correspondingly on both sides, and the two ends of the first side chord are respectively connected to one end of the first upper chord 21 and one end of the first lower chord 22, and the two ends of the second side chord are respectively connected to the other end of the first upper chord 21 and the other end of the first lower chord 22; a fan arc line 23 is formed between the middle part of the first side chord and the middle part of the second side chord, and the fan angle corresponding to the free cross-section is 16°.

[0030] Limiting the fan angle of the free cross section can effectively prevent the fan blade 2 from stalling, thereby reducing the energy loss of the fan blade 2 and improving the air supply efficiency of the fan blade 2; and it can effectively prevent the vortex at the trailing edge of the fan blade 2 from detaching, thereby reducing the noise of the fan blade 2 and achieving noise reduction.

[0031] When the cooling fan is arranged horizontally, along the axial direction of the hub 1, a blade wheelbase is formed between the upper and lower parts of the fan blades 2, and a hub wheelbase is formed in the axial direction of the hub 1. The ratio of the blade wheelbase to the hub wheelbase is greater than 90%. In this way, the air supply distance is increased and the wind pressure is enhanced.

[0032] Along the axial direction of the hub 1, the fan blades 2 and the hub 1 are centrally connected and arranged, thereby ensuring low noise while increasing the air supply distance and enhancing the wind pressure.

[0033] The fixed end has a fixed cross-section, the upper part of the fixed cross-section forms a second upper chord, the lower part of the fixed cross-section forms a second lower chord, and the two ends of the second upper chord are respectively arranged one-to-one with the two ends of the second lower chord to form two middle chord parts, a fan arc line 23 is formed between the two middle chord parts, and the fan angle corresponding to the fixed cross-section is 38°.

[0034] The fan angle of the fixed cross-section is limited so that the airflow is concentrated in the columnar space directly in front of the air outlet, increasing the air supply distance and air pressure, and improving the heat dissipation effect of the cooling fan.

[0035] Along the direction from the fixed end to the free end, the fan blades 2 are arranged in a twisted arc, and the twist angle of the fan blades 2 is between 21 and 23 degrees; in this way, the stall of the fan blades 2 can be effectively suppressed, thereby reducing the energy loss of the fan blades 2 and improving the air supply efficiency of the fan blades 2.

[0036] Along the direction from the fixed end to the free end, the fan blades 2 are arranged in a twisted arc, and the twist angle of the fan blades 2 is 22°; in this way, the stall of the fan blades 2 can be effectively suppressed, thereby reducing the energy loss of the fan blades 2 and improving the air supply efficiency of the fan blades 2.

[0037] The length of the first string is between 48 and 52 mm, and the length of the second string is between 7 and 11 mm.

[0038] The chord length of the first upper chord 21 is 50 mm, and the chord length of the second upper chord is 9 mm.

[0039] The wheel hub 1 has a hub shell, and the fan blades 2 are arranged in a circumferential interval along the hub shell, and the fan blades 2 and the hub shell are arranged in an integral molding, which facilitates the assembly of the cooling fan and the motor and reduces the production cost.

[0040] The hub shell has a hub plate 11, and the hub plate 11 is arranged in a transparent shape, so that the interior of the hub shell is visualized, which highlights the individuality and fun and is more popular with users.

[0041] The coil part is installed inside the hub shell, and the hub plate 11 is arranged corresponding to the coil part. The hub plate 11 is used to make the coil part visible. In this way, when the fan blade 2 performs heat-dissipating operation, the rotation of the fan blade 2 relative to the coil part creates a visual difference, making the cooling fan more interesting.

[0042] The hub plate 11 is provided with a plurality of lamp beads, which are used to emit light of different colors when powered on, thereby enhancing the atmosphere of heat dissipation and better meeting market demands.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling fan, characterized in that: It includes a hub and a plurality of fan blades, wherein the fan blades are arranged in a circumferential interval along the hub, and the fan blades are butt-jointed with the hub, and the fan blades include a free end and a fixed end, and the fixed end is butt-jointed with the hub; the free end has a first upper chord and a first lower chord, and the fixed end has a second upper chord and a second lower chord, and the chord length ratio of the second upper chord to the first upper chord is between 0.13 and 0.22; the axial length of the hub is L, and the two ends of the cross section of the fan blade form a fan arc line, and the angle formed by the projection of the fan arc line with the axial length L is the fan angle, and the angle range of the fan angle is between 16° and 38°.

2. The heat dissipation fan according to claim 1, characterized in that: Along the direction from the fixed end to the free end, the angle of the fan angle is gradually reduced.

3. The heat dissipation fan according to claim 1, characterized in that: The free end has a free cross-section, and the free cross-section includes a first side chord, a second side chord, the first upper chord and the first lower chord, the first side chord and the second side chord are arranged correspondingly on both sides, the two ends of the first side chord are respectively connected to one end of the first upper chord and one end of the first lower chord, and the two ends of the second side chord are respectively connected to the other end of the first upper chord and the other end of the first lower chord; the fan arc line is formed between the middle part of the first side chord and the middle part of the second side chord, and the fan angle corresponding to the free cross-section is 16°.

4. The heat dissipation fan according to claim 1, characterized in that: When the cooling fan is arranged horizontally, along the axial direction of the hub, a blade wheelbase is formed between the upper and lower parts of the fan blades, and a hub wheelbase is formed in the axial direction of the hub. The ratio of the blade wheelbase to the hub wheelbase is greater than 90%.

5. The cooling fan according to any one of claims 1 to 4, characterized in that: The fixed end has a fixed cross-section, the upper part of the fixed cross-section forms the second upper chord, the lower part of the fixed cross-section forms the second lower chord, and the two ends of the second upper chord are respectively arranged one-to-one with the two ends of the second lower chord to form two middle chord parts, the fan arc line is formed between the two middle chord parts, and the fan angle corresponding to the fixed cross-section is 38°.

6. The heat dissipation fan according to claim 5, characterized in that: Along the direction from the fixed end to the free end, the fan blades are arranged in a twisted arc shape, and the twist angle of the fan blades is between 21° and 23°.

7. The heat dissipation fan according to claim 6, characterized in that: Along the direction from the fixed end to the free end, the fan blades are arranged in a twisted arc shape, and the twist angle of the fan blades is 22°.

8. The cooling fan according to any one of claims 1 to 4, characterized in that: The chord length of the first upper chord is between 48 and 52 mm, and the chord length of the second upper chord is between 7 and 11 mm.

9. The cooling fan according to any one of claims 1 to 4, characterized in that: The chord length of the first upper chord is 50 mm, and the chord length of the second upper chord is 9 mm.

10. The cooling fan according to any one of claims 1 to 4, characterized in that: The wheel hub has a hub shell, and the fan blades are arranged in a circumferential and spaced relationship along the hub shell, and the fan blades are integrally formed with the hub shell; the hub shell has a hub plate, and the hub plate is arranged in a transparent shape.

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