Cooling fans for ultra-high temperature applications

Abstract

This utility model belongs to the field of fan technology and discloses a high-temperature application cooling fan, including: a bracket and fan blades made of liquid crystal polymer material; a plastic-coated iron sheet set at the bottom of the bracket, which is embedded in the bottom of the bracket and integrally formed with the bracket to isolate the heat source and evenly distribute the force on the bottom of the bracket; a spring made of Teflon material, which is installed at the bottom of the inner hole of the tube in the bracket; and a bearing, which is installed on the bracket and located on the inner wall of the fan blade hub, and is filled with G50 grease with a temperature resistance of 250℃ or higher. This utility model, by using liquid crystal polymer material with a glass transition temperature ≥180℃ to make the bracket and fan blades, makes the cooling fan less deformable during long-term use, ensuring dimensional stability and reliability over long-term use. The plastic-coated iron sheet at the bottom of the bracket not only effectively isolates the heat source, but also evenly distributes the force on the bottom of the bracket, avoiding structural damage caused by local overheating.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a cooling fan for ultra-high temperature applications. Background Technology

[0002] In the current technological field, cooling fans are widely used in various electronic devices, mechanical systems, and the automotive industry, especially for equipment that needs to operate in high-temperature environments, such as automotive lighting sources. Traditional cooling fans are usually made of metal or ordinary plastics, which often have significant limitations when facing ultra-high temperature environments. For example, although metal materials have good thermal conductivity, they are heavy, prone to vibration fatigue, and may deform at high temperatures; while ordinary plastics have poor temperature resistance and cannot withstand the requirements of long-term high-temperature operating environments. Utility Model Content

[0003] The main objective of this invention is to provide a cooling fan for ultra-high temperature applications, aiming to solve the problem that traditional cooling fans are usually made of metal or ordinary plastics, which often have significant limitations when facing ultra-high temperature environments. For example, although metal materials have good thermal conductivity, they are heavy, prone to vibration fatigue, and may deform at high temperatures; while ordinary plastics have poor temperature resistance and cannot withstand the requirements of long-term high-temperature working environments.

[0004] To achieve the aforementioned objectives of this utility model, the first aspect of this utility model proposes a cooling fan for ultra-high temperature applications, comprising:

[0005] The support and fan blades are made of liquid crystal polymer material;

[0006] A plastic-coated iron sheet is set at the bottom of the bracket. The plastic-coated iron sheet is embedded in the bottom of the bracket and integrally formed with the bracket. It is used to isolate the heat source and evenly distribute the force on the bottom of the bracket.

[0007] A spring made of Teflon material is mounted on a bracket;

[0008] The bearing is mounted on a bracket and located on the inner wall of the fan blade hub, and the bearing is filled with G50 grease that is resistant to temperatures above 250°C.

[0009] The motor is mounted on a bracket, and the output shaft of the motor is fixedly connected to the central mounting hole of the fan impeller hub.

[0010] Furthermore, the plastic-coated iron sheet is a rectangular or circular metal sheet, and its area covers at least 80% of the area at the bottom of the bracket that is in direct contact with the heat source.

[0011] Furthermore, the surface of the plastic-coated iron sheet is oxidized to form a heat insulation layer, and the thickness of the heat insulation layer is 0.1-0.3 mm.

[0012] Furthermore, the thickness of the liquid crystal polymer material of the support and the fan blade is 1.5-2.5 mm, and the glass transition temperature of the liquid crystal polymer material is ≥180℃.

[0013] Furthermore, the spring is installed at the bottom of the inner hole of the tube in the bracket.

[0014] Furthermore, the contact surfaces of the spring and the bracket are coated with a high-temperature resistant silicone layer, the temperature resistance of which is ≥200℃.

[0015] Furthermore, the high-temperature resistant silicone layer has a Shore hardness of 40A-60A, which is used to buffer high-frequency vibrations and avoid metal fatigue.

[0016] Furthermore, the liquid crystal polymer material of the bracket is integrally formed with the plastic-coated iron sheet through an injection molding process, with an injection temperature of 320℃-350℃ and a holding pressure of 80-100MPa.

[0017] Furthermore, the amount of G50 grease filling is 70%-85% of the internal void volume of the bearing.

[0018] Furthermore, the cooling fan is a 2207 bracket axial flow fan, suitable for automotive lighting source heat dissipation scenarios.

[0019] Beneficial effects:

[0020] 1. This utility model utilizes a liquid crystal polymer material with a glass transition temperature ≥180℃ to manufacture the bracket and fan blades, resulting in minimal deformation of the cooling fan during long-term use, ensuring dimensional stability and reliability. A plastic-coated iron sheet at the bottom of the bracket not only effectively isolates the heat source but also evenly distributes the stress on the bottom of the bracket, preventing structural damage caused by localized overheating. The heat insulation layer formed through oxidation treatment further enhances the thermal barrier performance.

[0021] 2. This invention utilizes a high-temperature resistant silicone layer with a Shore hardness of 40A-60A between the spring and the bracket to buffer high-frequency vibrations, prevent metal fatigue, and improve the fan's service life under complex operating conditions. The bearing is filled with G50 grease resistant to temperatures above 250℃, with an evaporation rate ≤0.5% / h, ensuring good lubrication even at high temperatures and extending the fan's working life. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a high-temperature application cooling fan according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of an explosion of a high-temperature application cooling fan according to an embodiment of this utility model;

[0024] Figure 3 This is a front view of a high-temperature application cooling fan according to an embodiment of this utility model;

[0025] Figure 4 This is a cross-sectional structural diagram of a high-temperature application cooling fan according to an embodiment of the present invention.

[0026] in:

[0027] 1-Bracket; 2-Fan blade; 3-Spring; 4-Plastic coated iron sheet; 5-Bearing; 6-Motor.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Reference Figures 1-4 An embodiment of this utility model provides a cooling fan for ultra-high temperature applications, comprising:

[0034] The support 1 and fan blade 2 are made of liquid crystal polymer material;

[0035] The plastic-coated iron sheet 4 is set at the bottom of the bracket 1. The plastic-coated iron sheet 4 is embedded in the bottom of the bracket 1 and integrally formed with the bracket 1. It is used to isolate the heat source and evenly distribute the force on the bottom of the bracket 1.

[0036] A spring clip 3 made of Teflon material is mounted on the bracket 1;

[0037] Bearing 5 is mounted on bracket 1 and located on the inner wall of the hub of fan blade 2. Bearing 5 is filled with G50 grease with a temperature resistance of 250°C or higher.

[0038] Motor 6 is mounted on bracket 1, and its output shaft is fixedly connected to the mounting hole in the center of the hub of fan blade 2. The liquid crystal polymer material of bracket 1 is integrally formed with plastic-coated iron sheet 4 through injection molding process. The injection molding temperature is 320℃-350℃, and the holding pressure is 80-100MPa.

[0039] In this embodiment, the cooling fan includes a bracket 1 and fan blades 2 made of liquid crystal polymer material. A plastic-coated iron sheet 4 is provided at the bottom of the bracket 1, and the plastic-coated iron sheet 4 is embedded in the bottom of the bracket 1 and integrally formed with the bracket 1. The function of the plastic-coated iron sheet 4 is to isolate the heat source and evenly distribute the force on the bottom of the bracket 1, thereby improving the overall structural stability and durability. The bearing 5 is mounted on the bracket 1 and located on the inner wall of the hub of the fan blades 2. The bearing 5 is filled with G50 grease that is resistant to temperatures above 250℃, and the filling amount is 70%-85% of the internal void volume of the bearing. The motor 6 is mounted on the bracket 1, and its output shaft is fixedly connected to the mounting groove in the center of the hub of the fan blades 2, driving the fan blades to rotate for efficient heat dissipation.

[0040] The cooling fan provided by this utility model, after running continuously for 500 hours in an environment of 160℃, has a deformation of bracket 1 of no more than 0.1mm and a dynamic balance offset of fan blade 2 of no more than 0.05g·mm, indicating that it has excellent high-temperature stability and structural reliability, meeting the needs of high-requirement applications such as industrial and automotive electronics.

[0041] In summary, this utility model effectively solves the problems of easy deformation, short lifespan, and large vibration of cooling fans in high-temperature environments by selecting high-performance liquid crystal polymer materials, introducing plastic-coated iron sheet 4 and heat insulation layer, using high-temperature resistant bearing grease and elastic buffer structure, and has significant technical progress and practical value.

[0042] Optionally, the plastic-coated iron sheet 4 is a rectangular or circular metal sheet, the area of ​​which covers at least 80% of the area at the bottom of the bracket 1 that is in direct contact with the heat source. The surface of the plastic-coated iron sheet 4 is oxidized to form a heat insulation layer, and the thickness of the heat insulation layer is 0.1-0.3 mm.

[0043] It should be noted that the plastic-coated iron sheet 4 is a rectangular or circular metal sheet, and its area covers at least 80% of the area at the bottom of the bracket 1 that is in direct contact with the heat source. Furthermore, the surface of the plastic-coated iron sheet 4 is oxidized to form a heat insulation layer with a thickness of 0.1-0.3 mm. This heat insulation layer not only improves the heat barrier performance but also enhances the oxidation resistance of the plastic-coated iron sheet 4, thereby extending its service life.

[0044] The thickness of the liquid crystal polymer material used in the support 1 and fan blade 2 is 1.5-2.5 mm, and the glass transition temperature of the liquid crystal polymer material is ≥180℃. The support 1 and fan blade 2 are made of liquid crystal polymer material with a thickness controlled between 1.5-2.5 mm and a high glass transition temperature ≥180℃, ensuring good mechanical strength and dimensional stability even at high temperatures. The support 1 is integrally formed with the plastic-coated iron sheet 4 through injection molding, where the injection temperature is controlled at 320℃-350℃ and the holding pressure is set at 80-100MPa to ensure a tight bond between the plastic-coated iron sheet 4 and the liquid crystal polymer material.

[0045] Furthermore, the spring piece 3 is installed at the bottom of the inner hole of the tube in the bracket 1. A high-temperature resistant silicone layer is coated on the contact surface between the spring piece 3 and the bracket 1, and the temperature resistance of the silicone layer is ≥200℃. The Shore hardness of the high-temperature resistant silicone layer is 40A-60A, used to buffer high-frequency vibrations and prevent metal fatigue.

[0046] To further enhance the vibration resistance of the cooling fan and prevent metal fatigue, a spring 3 made of Teflon material is fixed on the bracket 1. The spring 3 is located at the bottom of the inner hole of the tube in the bracket 1. More preferably, a high-temperature resistant silicone layer is coated on the contact surface between the spring 3 and the bracket 1. The silicone layer has a temperature resistance of not less than 200°C and a Shore hardness of 40A-60A, which is used to buffer high-frequency vibration and avoid metal fatigue caused by long-term operation.

[0047] The G50 grease filling amount is 70%-85% of the internal void volume of bearing 5. The evaporation rate of the G50 grease at a high temperature of 250℃ is ≤0.5% / h, ensuring that bearing 5 can maintain good lubrication performance under high temperature conditions and avoid premature failure.

[0048] This cooling fan is a 2207 bracket axial flow fan, suitable for heat dissipation of automotive headlights and other light sources. The cooling fan in this invention is preferably a 2207 bracket axial flow fan, particularly suitable for heat dissipation of automotive headlights and other light sources.

[0049] Note: When the cooling fan is installed in high-temperature applications such as automotive headlights, the heat source directly contacts the plastic-coated iron sheet 4 through the bottom of the bracket 1. Because the plastic-coated iron sheet 4 has excellent thermal conductivity and thermal barrier properties, it effectively isolates the heat source from being transferred to the upper part of the bracket 1, reducing the degree of heating of the liquid crystal polymer material. Furthermore, its large area coverage (≥80% contact area) can evenly distribute localized high-temperature stress to the entire bottom of the bracket 1, preventing deformation or structural failure caused by localized overheating.

[0050] The bracket 1 and fan blade 2 are made of liquid crystal polymer material with a glass transition temperature ≥180℃, maintaining good dimensional stability and mechanical properties even in high-temperature environments above 160℃. Combined with injection molding, the bracket 1 and the plastic-coated iron sheet 4 are integrally formed, enhancing the overall structural strength and ensuring that the fan is less prone to aging, deformation, or cracking during long-term operation. The spring clip 3 is made of high-temperature resistant Teflon and is installed at the bottom of the inner hole of the tube in the bracket 1 to compensate for assembly gaps and enhance the anti-loosening ability of fastener connections. Simultaneously, a high-temperature resistant silicone layer with a Shore hardness of 40A-60A is provided between the spring clip 3 and the bracket 1, which can buffer and dampen vibrations under high-frequency vibration conditions, prevent metal fatigue, and improve the reliability of the fan under complex operating conditions. Bearing 5 is located on the inner wall of the hub of fan blade 2 and is filled with G50 grease that is resistant to temperatures above 250℃. The filling amount is 70%-85% of the internal void volume of bearing 5, and the grease has an extremely low evaporation rate at high temperatures, ensuring that bearing 5 can maintain good lubrication during long-term operation and avoiding problems such as seizing or wear caused by lubrication failure. Motor 6 drives fan blade 2 to rotate, generating airflow to force-cool the heat source.

[0051] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A cooling fan for ultra-high temperature applications, characterized in that, include: A support (1) and a fan blade (2) made of liquid crystal polymer material; The plastic-coated iron sheet (4) is set at the bottom of the bracket (1). The plastic-coated iron sheet (4) is embedded in the bottom of the bracket (1) and integrally formed with the bracket (1). It is used to isolate the heat source and evenly distribute the force on the bottom of the bracket (1). A spring (3) made of Teflon material is mounted on a bracket (1); The bearing (5) is mounted on the bracket (1) and located on the inner wall of the hub of the fan blade (2). The bearing (5) is filled with G50 grease with a temperature resistance of 250°C or higher. The motor (6) is mounted on the bracket (1), and the output shaft of the motor (6) is fixedly connected in the center mounting hole of the hub of the fan blade (2).

2. The ultra-high temperature application cooling fan according to claim 1, characterized in that, The plastic-coated iron sheet (4) is a rectangular or circular metal sheet, and its area covers at least 80% of the area at the bottom of the support (1) that is in direct contact with the heat source.

3. The ultra-high temperature application cooling fan according to claim 1, characterized in that, The plastic-coated iron sheet (4) has an oxidized surface to form a heat insulation layer, and the thickness of the heat insulation layer is 0.1-0.3 mm.

4. The ultra-high temperature application cooling fan according to claim 1, characterized in that, The thickness of the liquid crystal polymer material of the support (1) and the fan blade (2) is 1.5-2.5 mm, and the glass transition temperature of the liquid crystal polymer material is ≥180℃.

5. The ultra-high temperature application cooling fan according to claim 1, characterized in that, The spring (3) is installed at the bottom of the inner hole of the tube in the bracket (1).

6. The ultra-high temperature application cooling fan according to claim 1, characterized in that, The contact surfaces of the spring (3) and the bracket (1) are coated with a high-temperature resistant silicone layer, the temperature resistance of which is ≥200℃.

7. The ultra-high temperature application cooling fan according to claim 6, characterized in that, The high-temperature resistant silicone layer has a Shore hardness of 40A-60A, which is used to buffer high-frequency vibrations and avoid metal fatigue.

8. The ultra-high temperature application cooling fan according to claim 1, characterized in that, The liquid crystal polymer material of the bracket (1) is integrally formed with the plastic-coated iron sheet (4) through injection molding process. The injection temperature is 320℃-350℃ and the holding pressure is 80-100MPa.

9. The ultra-high temperature application cooling fan according to claim 1, characterized in that, The amount of G50 grease filling is 70%-85% of the internal void volume of the bearing (5).

10. The ultra-high temperature application cooling fan according to claim 1, characterized in that, This cooling fan is a 2207 bracket axial flow fan, suitable for automotive headlight heat dissipation scenarios.

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