Cooling fan with inner and outer multi-layer fan blade structure

Abstract

The utility model provides a cooling fan with an inner and outer multilayer fan blade structure, at least one layer of isolating ring is arranged on the outer side of a central hub, the outer side of the central hub is divided into a plurality of cooling areas from inside to outside by the isolating ring, and a fan blade is arranged in each cooling area. By changing the number, the deviation angle and the like of the fan blades, the air pressure of each heat dissipation area can be adjusted, so that different airflows can be output outwards in the radial direction according to specific requirements. The cooling fan provided by the embodiment of the utility model has the partitioned arrangement of high air volume of the inner ring and high static pressure of the outer ring, and can meet the requirements of a plurality of different application scenes.

Description

Technical Field

[0001] This utility model designs a cooling fan, specifically a cooling fan with an inner and outer multi-layer fan blade structure. Background Technology

[0002] Cooling fans are common heat dissipation devices, often used for airflow cooling in heat-generating areas such as computer cases and cabinets. Different applications place different demands on cooling fans. For example, server equipment with compact internal spaces generates a lot of heat, requiring high-airflow, high-pressure cooling fans to ensure stable server operation; cooling fans used in household appliances need to be as small and lightweight as possible, with lower airflow requirements. Even within a single device, different areas may have different airflow requirements due to varying material temperatures. Current technologies typically use a single type of cooling fan for heat dissipation, which may result in some areas of the device not reaching ideal temperatures; alternatively, the device may be divided into multiple zones, each with its own fan.

[0003] In view of the above-mentioned existing technology, it is necessary to improve the structure of the cooling fan so that it can output the appropriate air volume according to the needs of different areas during operation. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a cooling fan with an inner and outer multi-layer fan blade structure, including a central hub and at least one spacer ring arranged circumferentially on the outside of the central hub and rotating coaxially with the central hub. The spacer ring divides the outer side of the central hub into multiple heat dissipation areas from the inside to the outside. Multiple fan blades are arranged in each heat dissipation area, and the air pressure of each heat dissipation area is different. The ends of the fan blades in each heat dissipation area are respectively connected to the spacer ring of that heat dissipation area or the side wall of the central hub.

[0005] According to one embodiment of the present invention, the air pressure in the heat dissipation area located on the inner side gradually increases towards the heat dissipation area on the outer side.

[0006] According to one embodiment of the present invention, the number of fan blades or the angle between the fan blades and the axis of rotation are different in each heat dissipation area.

[0007] According to one embodiment of the present invention, the spacer ring and the central hub are columnar structures, and their sidewalls extend in a direction parallel to the main shaft of the equipment.

[0008] According to one embodiment of the present invention, the outer edge dimension of the fan blade is larger than the inner edge dimension.

[0009] According to one embodiment of the present invention, the difference in the number of fan blades in two adjacent heat dissipation areas is no more than three.

[0010] According to one embodiment of the present invention, the radial dimension of the heat dissipation area gradually increases from the inside to the outside.

[0011] According to one embodiment of the present invention, there are 5-7 fan blades located in the innermost heat dissipation area, and the angle between the curved surface of the fan blades and the axis of rotation is 30-45°.

[0012] According to one embodiment of the present invention, the number of spacer rings is not less than two layers.

[0013] This invention provides a cooling fan with a multi-layered blade structure, comprising at least one insulating ring on the outer side of a central hub. This insulating ring divides the outer side of the central hub into multiple cooling zones from the inside out, each zone containing fan blades. By changing the number of fan blades, their offset angle, etc., the air pressure in each cooling zone can be adjusted, allowing it to output different airflows radially according to specific needs. The cooling fan provided in this embodiment features a partitioned design with high airflow in the inner ring and high static pressure in the outer ring, making it suitable for various application scenarios. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention, which is a cooling fan with an inner and outer multi-layer fan blade structure.

[0015] Figure 2 This is a three-dimensional structural diagram of Embodiment 2 of the present invention;

[0016] Figure 3 This is the front view of Embodiment 2 of this utility model.

[0017] Reference numerals: 1. Center hub; 2. Spacer ring; 3. Inner fan blade; 4. Outer fan blade; 5. Middle fan blade. Detailed Implementation

[0018] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0020] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] To further understand the content, features, and effects of this utility model, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0022] Example 1: As Figure 1 The cooling fan shown has a multi-layered blade structure, including a central hub 1 and multiple inner blades 3 extending circumferentially outward from the central hub 1. The inner blades 3 are evenly distributed around the central hub 1 on their inner sides and are securely mounted on the periphery of the central hub 1 at a certain helical angle. The central hub 1 is connected to the output end of a rotary motor, and the inner blades 3 rotate together with the central hub 1. The helical design of the blades can effectively cut and propel the airflow, increase the thrust when the blades rotate, optimize the airflow path, reduce airflow turbulence, and improve the fan's air delivery effect.

[0023] Based on the airflow direction during fan operation, the fan can be divided into an intake side and an exhaust side. The air can flow from the intake side to the exhaust side along the spiral surface of the inner fan blades 3. A spacer ring 2 is provided on the outer side of the central hub 1. The other end of the inner fan blades 3 is fixed to the inner side of the spacer ring 2 by welding or other connection methods. The inner fan blades 3 are confined between the central hub 1 and the spacer ring 2, so that the entire cooling fan forms a complete whole from the inside to the outside, which enhances the connection strength between the fan blades and effectively prevents the deformation of the fan blades.

[0024] Multiple outer fan blades 4 extend outward from the circumferential outer side of the spacer ring 2. The outer fan blades 4 and inner fan blades 3 are separated by the spacer ring 2. Depending on the number, size, and helical angle of the outer and inner fan blades 4 relative to the inner side of the rotation axis, airflow of different directions and speeds can be generated in different areas, forming two layers of heat dissipation zones to address different application scenarios within and outside the spacer ring 2. In this embodiment, for example, the inner fan blades 3 are relatively few (7 blades), with a relatively large helical angle and an angle of 30-45° between the blade surface and the rotation axis. The inner fan blades 3 experience lower wind pressure, resulting in a larger airflow volume within the spacer ring 2. Conversely, the outer fan blades 4 are more numerous and have smaller helical angles, resulting in high static pressure, low noise, and high efficiency in the outer area of ​​the spacer ring 2, making it suitable for scenarios with high system impedance.

[0025] Both the spacer ring 2 and the central hub 1 are cylindrical structures, which are relatively simple in structure, have low manufacturing and installation costs, and can be adapted to most fan blade specifications, exhibiting strong compatibility and adaptability. Simultaneously, the cylindrical spacer ring 2 can guide the airflow between the two separated areas, reducing interference between the wind directions of the two areas. The width of the inner fan blade 3 and the outer fan blade 4 gradually increases from the inside to the outside, which helps to generate a larger airflow and pressure at locations away from the axis, thereby reducing airflow separation and vortex phenomena on the fan blade surface. Furthermore, the spacer ring 2 makes full contact with the outer or inner edges of the inner fan blade 3 and the outer fan blade 4 on both sides, providing the most adequate support to the fan blades on both sides.

[0026] Example 2: Figure 2 and Figure 3 Another type of cooling fan is demonstrated, featuring two rings 2 spacers on the outer side of the central hub 1. The fan blades are also divided into three layers from the inside out: inner blade 3, middle blade 5, and outer blade 4. The radial ends of the inner blade 3 connect to the central hub 1 and the inner ring 2, respectively. The middle blade 5 connects between the two rings 2, and the outer blade 4 extends outward from the side of the outer ring 2. The three layers of blades are tightly connected into a stable whole by the two rings 2. The number of blades 4 gradually increases from the inside out, and the helical angle of the blades relative to the inner side of the rotation axis gradually decreases, resulting in a high airflow in the inner ring and high static pressure in the outer ring, forming three distinct cooling zones with different effects from the inside out. Simultaneously, the outer rings 2 provide support to the blades, maintaining the stability of the entire structure and preventing excessive pressure on the central hub 1 due to the excessive length of the three-layer blade area. The difference in the number of blades between adjacent layers is no more than three, allowing for a smooth transition of airflow between the three ventilation zones without mutual interference. Similarly, the radial dimensions of the three heat dissipation zones gradually increase to balance the forces on the fan blades in different heat dissipation zones.

[0027] It is foreseeable that the spacer ring 2 can effectively separate different heat dissipation areas. Its number is not limited to one or two layers as listed in the embodiments, but can also be set to two or more layers to meet specific needs.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cooling fan with an inner and outer multi-layer blade structure, characterized in that: It includes a central hub and at least one spacer ring circumferentially disposed on the outside of the central hub and rotating coaxially with the central hub. The spacer ring divides the outer side of the central hub into multiple heat dissipation areas from the inside to the outside. Each heat dissipation area is provided with multiple fan blades, and the air pressure of each heat dissipation area is different. The ends of the fan blades in each heat dissipation area are respectively connected to the spacer ring of that heat dissipation area or the side wall of the central hub. The air pressure gradually increases from the inner heat dissipation area to the outer heat dissipation area; The number of fan blades varies in each heat dissipation area; The innermost heat dissipation area contains 5-7 fan blades, and the angle between the curved surface of the fan blades and the axis of rotation is 30-45°.

2. A cooling fan with an inner and outer multi-layer fan blade structure as described in claim 1, characterized in that: The spacer ring and the central hub are columnar structures, with their sidewalls extending parallel to the main shaft of the equipment.

3. A cooling fan with an inner and outer multi-layer fan blade structure as described in claim 1, characterized in that: The outer edge dimension of the fan blade is larger than the inner edge dimension.

4. A cooling fan with an inner and outer multi-layer fan blade structure as described in claim 1, characterized in that: The difference in the number of fan blades between two adjacent heat dissipation areas should not exceed three.

5. A cooling fan with an inner and outer multi-layer fan blade structure as described in claim 1, characterized in that: The radial dimension of the heat dissipation area gradually increases from the inside to the outside.

6. A cooling fan with an inner and outer multi-layer fan blade structure as described in claim 1, characterized in that: The number of spacer rings is no less than two layers.

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