Double-support quick-assembly type thermal management variable-diameter micro high-speed fan

Abstract

The application relates to the field of micro high-speed fans, in particular to a double-support quick-assembly type thermal management variable-diameter micro high-speed fan. The device comprises a coaxially nested outer shell assembly and inner shell assembly, a motor fixedly installed in the inner shell assembly, and an impeller assembled at the output shaft end of the motor, wherein the inner shell assembly is coaxially arranged inside the outer shell assembly through a detachable structure, and an annular airflow channel is formed between the two. The inner wall of the outer shell assembly is circumferentially and uniformly provided with radially extending flow guide vanes, the inner edge end of the flow guide vanes is in interference fit with the outer wall of the inner shell assembly, and then the combination and fixation of the outer shell assembly and the inner shell assembly are realized. The concentric double-side support bearing design adopted by the application effectively enhances the stability of rotor operation, suppresses vibration and noise, and improves the reliability of the device.

Description

Technical Field

[0001] This application relates to the field of micro high-speed fans, and in particular to a dual-support quick-installation thermal management variable diameter micro high-speed fan. Background Technology

[0002] In the field of micro high-speed fan technology, especially in applications such as hair dryers, high-speed fans, and portable large fans, where high requirements are placed on product compactness, air pressure, and air volume, micro high-speed fans are the core components for achieving high-performance output. Existing technologies generally employ a double-shell structure consisting of an outer shell and an inner shell. The inner shell houses the motor, and the impeller is directly mounted on the motor's output shaft. The inner wall of the outer shell often features guide vanes to direct airflow. To achieve miniaturization, the inner shell assembly often adopts a compact, one-piece design, while the motor rotor support, due to space constraints, often uses a single-sided cantilever bearing or a simple double-sided independent bearing. The initial intention of this design was to integrate the air duct and power source within a limited space, meeting portability requirements. However, existing technologies have revealed a series of shortcomings in practical applications that limit performance and user experience. The root cause lies in the lack of targeted structural design and the failure to effectively address key performance bottlenecks.

[0003] Specifically, existing miniature high-speed fan solutions for these size-sensitive products have significant drawbacks. First, while the one-piece molded inner shell structure saves space, it makes assembly and maintenance extremely inconvenient. When repairs or replacements of internal motor components are needed, the equipment usually needs to be almost completely disassembled, which contradicts the requirements for user-friendliness and rapid maintenance of small equipment, significantly extending downtime and increasing operational difficulty. Second, in the pursuit of miniaturization, the stability and precision of the rotor support system are often compromised. Whether it is a single-bearing cantilever support or a loosely structured, simple double-sided independent bearing installation, it is difficult to effectively suppress rotor yaw and vibration under high-speed rotation. This not only generates unpleasant noise but also significantly reduces the reliability of motor operation and the stability of airflow output from the impeller in a compact space, making it difficult to meet the stringent requirements of high-speed fans for high-pressure output. Third, heat dissipation becomes a key bottleneck. The heat generated by a high-speed motor in a compact space is difficult to dissipate effectively. Common designs use convection holes with fixed diameters in the casing for heat dissipation, but this solution is insufficient for heat dissipation under high loads, potentially leading to motor overheating, frequency throttling, or failure. Under low loads, excessive ventilation results in reduced air pressure efficiency. Existing solutions cannot intelligently adapt to the dynamic heat dissipation requirements of actual operating conditions. Finally, the traditional uniform-diameter straight cylindrical airflow channel design also limits the improvement of aerodynamic efficiency. Under the constraint of limited casing size, the lack of an effective airflow guidance and acceleration mechanism makes it difficult to achieve higher jet air pressure while ensuring a large air volume. This contradicts the requirement of small devices to have both large air volume (such as rapid drying) and high air pressure (such as the styling airflow of a hair dryer).

[0004] Therefore, developing a new type of micro high-speed fan that is particularly suitable for compact space applications has urgent practical significance and significant value. Utility Model Content

[0005] The purpose of this application is to overcome at least one deficiency of the prior art and to provide a dual-support quick-installation thermal management variable diameter micro high-speed fan.

[0006] To achieve the above objectives, this application discloses a high-speed fan device based on a double-support quick-assembly structure. The device includes a coaxially nested outer shell assembly and an inner shell assembly, a motor fixedly installed in the inner shell assembly, and an impeller assembled at the motor's output shaft end. The inner shell assembly is coaxially disposed inside the outer shell assembly via a detachable structure, forming an annular airflow channel between them. Radially extending guide vanes are evenly distributed circumferentially on the inner wall of the outer shell assembly, and the inner edge of the guide vanes forms an interference fit with the outer wall of the inner shell assembly, thereby achieving the combined fixation of the outer shell assembly and the inner shell assembly. The inner shell assembly adopts a split structure, consisting of a main base and a closed cover plate. The main base includes an integrally formed arc-shaped load-bearing wall and concentric support cylinders at both axial ends, forming a semi-open motor housing area. The closed cover plate is detachably connected to the main base through a pre-set snap-fit ​​mechanism, together forming a closed cylindrical housing cavity. The motor stator is fixed in the housing cavity, and the rotor output shaft is supported at both ends in the double-sided support cylinders, with radial running stability ensured by the coaxial support structure.

[0007] Furthermore, the outer wall of the inner shell assembly is provided with an annular positioning flange at the tail end. When the outer shell assembly is assembled, the inner edge of the guide vane and the outer wall of the inner shell assembly form an interference fit until the positioning flange axially abuts against the end face of the guide vane to form an assembly termination reference, thereby realizing the assembly.

[0008] Furthermore, the concentric support cylinder is a composite structure, consisting of, from the outside to the inside, a base layer connected to the arc-shaped bearing wall, an elastic damping layer, a hard alloy bearing ring, and a self-lubricating graphite layer on its surface.

[0009] Furthermore, the outer surface of the inner shell assembly is provided with a plurality of heat dissipation through holes; a self-opening and closing valve plate is installed at the heat dissipation through holes, the self-opening and closing valve plate comprising a rotating plate body and a nickel-titanium-based shape memory alloy driving plate; the rotating plate body is rotatably mounted in the bushing of the side wall of the heat dissipation through holes via a rotating shaft; one end of the nickel-titanium-based shape memory alloy driving plate is fixedly connected to the free end of the rotating plate body, and the other end is fixedly connected to the inner shell assembly; the shape memory alloy driving plate has a pre-stored torsional deformation angle of 90 degrees in the room temperature installation state, and closes the heat dissipation through holes at room temperature.

[0010] Furthermore, the austenitic phase transformation endpoint temperature of the nickel-titanium-based shape memory alloy driving sheet is set to 75℃±1℃. When the temperature is below the transformation endpoint temperature, the pre-stored torsional deformation energy keeps the rotating plate in a closed position; when the temperature rises to the transformation endpoint temperature, the nickel-titanium-based shape memory alloy driving sheet undergoes an austenitic phase transformation and deforms, driving the rotating plate to rotate, thereby opening the heat dissipation through hole. Compared with the prior art, this application has at least one of the following beneficial technical effects: 1. This application achieves rapid assembly and maintenance of internal components of the equipment through a split inner shell structure and a detachable cover plate, which is beneficial to industrial production.

[0011] 2. This application adopts a concentric double-sided support bearing design, which effectively enhances the stability of rotor operation, suppresses vibration and noise, and improves equipment reliability.

[0012] 3. This application integrates an intelligent self-opening and closing heat dissipation valve, which can dynamically adjust the heat dissipation holes according to temperature changes, optimize heat dissipation efficiency and reduce wind pressure loss.

[0013] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0014] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings: Figure 1 This is a schematic diagram of the structure of one embodiment disclosed in this application.

[0015] Figure 2 This application discloses a schematic diagram of the structure of the inner shell assembly and outer shell assembly under an explosive state in one embodiment.

[0016] Figure 3 This is a cross-sectional structural diagram of one embodiment disclosed in this application.

[0017] Figure 4 This is a schematic diagram of the structure of the inner shell assembly in one embodiment of this application.

[0018] Figure 5 This is an exploded structural diagram of the inner shell assembly in one embodiment of this application.

[0019] Figure 6 This is a cross-sectional structural schematic diagram of the concentric support cylinder in one embodiment of the present application.

[0020] Figure 7This is a schematic diagram of the structure of a self-opening and closing valve plate in one embodiment of this application.

[0021] Figure 8 This is a schematic cross-sectional view of a portion of the heat dissipation through-hole in one embodiment of this application, with the valve plate in the open state. Detailed Implementation

[0022] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0023] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0024] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0025] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0026] See attached document Figures 1 to 8 In this embodiment, an exemplary structure of a high-speed fan device based on a dual-support quick-assembly structure is provided. Its structure mainly comprises a coaxially nested outer shell assembly 1 and an inner shell assembly 2, a motor 3 fixedly installed in the inner shell assembly 2, and an impeller 4 assembled at the output shaft end of the motor 3. The inner shell assembly 2 is coaxially disposed inside the outer shell assembly 1 via a detachable structure, forming an annular airflow channel 5 between the two.

[0027] The inner wall of the outer shell assembly 1 is evenly distributed with radially extending guide vanes 101. The inner edge of the guide vanes 101 forms an interference fit with the outer wall of the inner shell assembly 2, thereby realizing the combination and fixation of the outer shell assembly 1 and the inner shell assembly 2. This fitting method is not only convenient to install, but also ensures the sealing and stability between the two.

[0028] The inner shell assembly 2 adopts a split structure, consisting of a main base 201 and a closed cover plate 202. The main base 201 includes an integrally formed arc-shaped bearing wall 2011 and concentric support cylinders 2012 at both axial ends, forming a semi-open motor housing area. The closed cover plate 202 is detachably connected to the main base 201 through a pre-set snap-fit ​​mechanism, together forming a closed cylindrical housing cavity.

[0029] In motor 3, the motor stator is fixed in the accommodating cavity, and the two ends of the rotor output shaft are respectively supported in the double-sided support cylinders 2012. This coaxial structure can effectively ensure the stability of the motor's radial operation, reduce vibration and noise, and improve the overall operating performance and service life of the fan.

[0030] Furthermore, the outer wall of the inner shell assembly 2 is provided with an annular positioning flange at its tail. When the outer shell assembly 1 is assembled, the inner edge of the guide vane 101 and the outer wall of the inner shell assembly 2 form an interference fit until the positioning flange axially abuts against the end face of the guide vane 101, forming an assembly termination reference, thereby achieving precise, fast, and reliable assembly and improving assembly efficiency and quality.

[0031] In this embodiment, the concentric support cylinder 2012 is a composite structure, consisting of, from the outside to the inside, a base layer 2013 connected to the arc-shaped bearing wall, an elastic damping layer 2014, a hard alloy bearing ring 2015, and a self-lubricating graphite layer 2016 on its surface. The base layer 2013 provides the basic structural strength for the support cylinder; the elastic damping layer 2014 effectively absorbs vibrations generated during motor operation, playing a role in shock absorption and noise reduction; the hard alloy bearing ring 2015 has high hardness and wear resistance, and can withstand the rotational friction of the rotor output shaft, extending the service life of the support cylinder; the self-lubricating graphite layer 2016 on the surface reduces the coefficient of friction, reduces rotational resistance, and avoids wear problems caused by poor lubrication, ensuring the smooth operation of the motor rotor.

[0032] In this high-speed fan, the annular airflow channel 5 is designed as a gradually narrowing channel with a larger inlet cross-sectional area and a relatively smaller outlet cross-sectional area, thereby creating a predetermined compression ratio between the inlet and outlet. When the airflow enters this annular airflow channel, the airflow undergoes a micro-compression process due to the gradual decrease in the channel's cross-sectional area, resulting in a corresponding increase in airflow pressure.

[0033] After the airflow is slightly compressed, when it reaches the outlet of the annular airflow channel 5 and is discharged from the fan, the compression effect that previously restricted the airflow volume is eliminated. At this point, under the influence of the pressure gradient, the gas rapidly returns to its original volume. This return process is accompanied by a significant increase in the kinetic energy of the gas molecules, which in turn further increases the airflow velocity.

[0034] Through the aforementioned tapered flow channel design, this equipment can achieve an additional acceleration effect by utilizing the natural recovery process of gas volume after the airflow exits the fan. This design not only improves the aerodynamic efficiency of the fan but also allows the discharged gas to have a higher flow velocity.

[0035] In addition, the outer surface of the inner shell assembly 2 is provided with several heat dissipation holes 203. Each heat dissipation hole 203 is equipped with a self-opening and closing valve plate 204, which includes a rotating plate 2041 and a nickel-titanium-based shape memory alloy driving plate 2042. The rotating plate 2041 is rotatably mounted within the bushing of the side wall of the heat dissipation hole 203 via a rotating shaft, allowing for flexible rotation to control the opening and closing state of the heat dissipation hole 203. One end of the nickel-titanium-based shape memory alloy driving plate 2042 is fixedly connected to the free end of the rotating plate 2041, and the other end is fixedly connected to the inner shell assembly 2. This shape memory alloy driving plate has a pre-stored torsional deformation angle of 90 degrees under normal temperature installation conditions and keeps the heat dissipation holes 203 closed to prevent dust and other foreign objects from entering the inner shell assembly 2 and affecting the normal operation of the motor.

[0036] When the internal temperature of the inner shell assembly 2 rises to the austenitic phase transformation endpoint temperature of the nickel-titanium-based shape memory alloy drive plate 2042 (set at 75℃±1℃), the shape memory alloy drive plate undergoes an austenitic phase transformation and deforms, driving the rotating plate 2041 to rotate. This opens the heat dissipation vents, allowing the heat inside the inner shell assembly 2 to dissipate through the heat dissipation vents 203, thus achieving automatic heat dissipation. When the temperature drops below the phase transformation endpoint temperature, the drive plate returns to its original shape, driving the rotating plate 2041 back to the closed position, resealing the heat dissipation vents 203 to maintain a stable environment inside the inner shell assembly 2. This self-opening and closing valve plate design can intelligently adjust the opening and closing of the heat dissipation vents 203 according to actual temperature changes without manual intervention, effectively improving the intelligence and operational reliability of the fan equipment.

[0037] In this example, a high-speed fan based on a dual-support quick-installation structure is applied to a ventilation and heat dissipation system in industrial production. When the equipment starts normally and the motor initially runs, the heat generated is relatively small, resulting in a relatively low internal temperature for the inner shell assembly 2. At this time, the self-closing valve plate 204 is normally closed, effectively preventing dust and other foreign objects from entering the inner shell assembly 2, while also avoiding unnecessary heat dissipation and ensuring maximum fan efficiency. This design cleverly combines the actual needs of the equipment at different operating stages, achieving a balance between heat dissipation and energy saving.

[0038] As the motor continues to run, internal heat gradually accumulates, and the temperature slowly rises. When the temperature approaches 75°C, the shape memory alloy drive plate begins to respond to the temperature change, undergoing an austenitic phase transformation. This phase transformation drives the rotating plate 2041 to overcome the pre-stored torsional deformation angle, causing the rotating plate 2041 to rotate and opening the heat dissipation vent 203. Airflow then flows through the heat dissipation vent 203, efficiently carrying away the heat inside the inner shell assembly 2, thereby effectively preventing the motor from malfunctioning due to overheating and ensuring the stable and continuous operation of the fan equipment.

[0039] In practical applications, this self-closing cooling design demonstrates significant advantages compared to traditional fixed cooling structures. Traditional structures either waste energy due to continuous heat dissipation or fail to respond promptly when cooling is needed. In contrast, the self-closing valve plate 204 in this design intelligently adjusts the cooling effect according to actual temperature requirements. When cooling is not needed, the valve plate remains closed, preventing dust and other foreign objects from entering, reducing maintenance frequency, and improving the fan's airflow efficiency. This intelligent design ensures that the fan equipment maintains cooling performance while also achieving energy conservation and long-term equipment stability, providing a more efficient and reliable solution for ventilation and cooling systems in industrial production.

[0040] In summary, this high-speed fan equipment based on a dual-support quick-assembly structure achieves convenient assembly, stable operation, high-efficiency aerodynamic performance, and intelligent heat dissipation through the ingenious design and reasonable coordination of its components. It can be widely used in various industrial scenarios requiring high-speed airflow, providing a high-performance, reliable, and practical fan equipment solution for related fields.

[0041] While exemplary embodiments of this disclosure have been described, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope thereof. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A dual-support quick-installation thermal management variable diameter micro high-speed fan, characterized in that, The device includes a coaxially nested outer shell assembly and an inner shell assembly, a motor fixedly installed in the inner shell assembly, and an impeller assembled on the output shaft end of the motor. The inner shell assembly is coaxially disposed inside the outer shell assembly through a detachable structure, forming an annular airflow channel between the two. The inner wall of the outer shell assembly is circumferentially distributed with radially extending guide vanes, and the inner edge of the guide vanes forms an interference fit with the outer wall of the inner shell assembly, thereby realizing the combination and fixation of the outer shell assembly and the inner shell assembly. The inner shell assembly adopts a split structure, consisting of a main base and a closed cover plate. The main base includes an integrally formed arc-shaped bearing wall and concentric support cylinders at both ends of its axial direction, forming a semi-open motor housing area. The closed cover plate is detachably connected to the main base through a preset snap-fit ​​mechanism, together forming a closed cylindrical housing cavity. The motor stator is fixed in the housing cavity, and the rotor output shaft is supported at both ends in the double-sided support cylinders. The outer surface of the inner shell assembly is provided with several heat dissipation through holes; a self-opening and closing valve plate is installed at each heat dissipation through hole, the self-opening and closing valve plate includes a rotating plate body and a nickel-titanium-based shape memory alloy driving plate; the rotating plate body is rotatably installed in the bushing of the side wall of the heat dissipation through hole via a rotating shaft; one end of the nickel-titanium-based shape memory alloy driving plate is fixedly connected to the free end of the rotating plate body, and the other end is fixedly connected to the inner shell assembly. The shape memory alloy driving plate has a pre-stored torsional deformation angle of 90 degrees in the room temperature installation state and closes the heat dissipation through hole at room temperature.

2. The dual-support quick-installation thermal management variable diameter micro high-speed fan as described in claim 1, characterized in that, The inner shell assembly has an annular positioning flange at the tail of its outer wall.

3. The dual-support quick-installation thermal management variable diameter micro high-speed fan as described in claim 1, characterized in that, The concentric support cylinder is a composite structure, consisting of, from the outside to the inside, a base layer connected to the arc-shaped bearing wall, an elastic damping layer, a hard alloy bearing ring, and a self-lubricating graphite layer on its surface.

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