Automobile cooling fan structure

Abstract

The utility model relates to an automobile cooling fan structure. An automobile cooling fan structure comprises a fan frame, an impeller type motor is installed in the center of the fan frame, the impeller type motor comprises a stator, an impeller rotor and a controller, the impeller rotor comprises an impeller and a rotor assembly located in the center of the impeller, and the rotor assembly comprises a rotor shell. The end face of the rotor shell is provided with an air hole structure, and the air hole structure forms an air guide space in the axial direction. The utility model provides an automobile cooling fan device which is good in cooling effect and high in reliability. The technical problem that in the prior art, an automobile cooling fan structure is not ideal in cooling effect is solved.

Description

Technical Field

[0001] This utility model relates to the structure of a cooling fan, and more particularly to a cooling fan structure used in automobiles. Background Technology

[0002] The automotive fan is a crucial component of the vehicle's engine cooling / vehicle thermal management system. Its function is to expel hot air after the coolant has been cooled by the radiator, maintaining the temperature of the engine / motor, battery, and electronic control systems within a suitable range to prevent damage caused by overheating. The automotive fan plays a vital role in ensuring the safety, reliability, and stability of the vehicle.

[0003] A conventional fan assembly includes a fan frame, a motor mounted on the fan frame, and an impeller mounted on the motor. The fan frame includes a base, an outer frame, and ribs connecting the base and the outer frame. The motor includes a stator, a rotor housing, and a controller. The controller includes a circuit board assembly, a housing with heat dissipation features, and wiring harnesses. The impeller includes a hub, fan blades extending from the hub, and blades. The hub includes an end wall and an annular side wall extending from the periphery of the end wall. The end wall is secured to the rotor housing of the motor by fastening bolts. The fan blades extend outward from the outer surface of the side wall. The side wall and the outer surface of the motor rotor housing form a receiving space. The blades extend from the inner surface of the side wall and reside within this receiving space.

[0004] In the aforementioned traditional automotive cooling fans, the airflow passing through the motor is relatively small and the path is circuitous, resulting in a generally poor cooling effect. The high-temperature environment in the engine compartment and the heat generated by the motor itself may cause a series of problems such as increased stator losses and demagnetization of the ferrite magnets on the rotor housing, further reducing the motor's performance and reliability. Utility Model Content

[0005] This utility model provides a car cooling fan structure with good cooling effect and high reliability; it solves the technical problem that the cooling effect of existing car cooling fan structures is not ideal.

[0006] This utility model also provides a compact, lighter, more integrated, more reliable, more efficient, lower cost, and better NVH performance automotive cooling fan structure; it solves the technical problems of numerous parts and low reliability in existing automotive cooling fan structures.

[0007] The above-mentioned technical problem of this utility model is solved by the following technical solution: An automotive cooling fan structure includes a fan frame, with an impeller motor installed at the center of the fan frame. The impeller motor includes a stator, an impeller rotor, and a controller. The impeller rotor includes an impeller and a rotor assembly located at the center of the impeller. The rotor assembly includes a rotor housing, and a perforation structure is formed on the end face of the rotor housing. The perforation structure forms an air guiding space in the axial direction. The three-dimensional perforation structure formed on the end face of the rotor housing increases the axial space between the perforation structure and the stator, improving the air intake. The airflow generated by the blade rotation enters the axial space through the perforation structure and is finally discharged from the annular space between the motor and the controller, thereby better cooling the motor and the controller.

[0008] Preferably, the air vent structure includes an opening on the end face, and a guide plate is formed on the outer side of the rotor housing end face, positioned above the opening. The opening is for air intake, and the guide plate increases the axial air intake space, improving the cooling effect.

[0009] Preferably, the extension line of the opening passes through the center of the rotor housing. The blade opening extension line passes through the rotor housing axis, meaning the inlet is perpendicular to the rotational tangential direction. This facilitates airflow into the rotor housing, minimizes frictional loss (i.e., pressure loss) between the airflow and the rotor housing, and provides the best cooling effect for the motor.

[0010] Preferably, the air guide plate includes an air guide plate body and air guide plate connectors located on both sides. The air guide plate body is arc-shaped, and the air guide plate connectors are spherical. This air guide plate with a closed structure at both ends avoids the problem of airflow entering the air guide plate flowing out from the openings on both sides, resulting in higher air intake efficiency.

[0011] Preferably, the rotor housing is a cylinder open at one end, made of metal, with the impeller as the central hub, and the impeller and rotor housing are injection molded as one piece. This integrated design reduces the number and complexity of parts, optimizes space utilization, and makes the overall structure more compact. A smaller hub dead zone, or a smaller axial dimension of the motor for the same hub diameter, is especially important for vehicles with limited axial space. Furthermore, integration reduces the number of connecting parts, lowering the likelihood of problems and increasing service life.

[0012] Preferably, magnets are evenly distributed on the inner wall of the rotor housing. The rotor housing is made of a magnetically conductive material and provides a magnetic path for adjacent magnets. Alternatively, the rotor housing may be made of alloy steel, which also serves as the rotor housing yoke, providing a magnetic path between adjacent magnets and thus acting as a magnetic conductor.

[0013] Preferably, a vent structure is provided on the bottom surface of the rotor housing, and an opening is provided on the annular surface of the rotor housing. The opening on the annular surface facilitates the injection molding of the rotor housing and blades, allowing plastic to enter through the opening and firmly bond the rotor housing and blades together.

[0014] Preferably, the fan frame is provided with a compensating damper.

[0015] Preferably, the compensating damper structure includes an air inlet at the beginning of the fan frame, a hinge shaft at one end of the air inlet, and a damper plate hinged to the hinge shaft. The damper plate and the hinge shaft form a rotating pair, allowing the damper plate to deflect around it. Under most operating conditions, the compensating damper is closed due to gravity. When the vehicle is traveling at a high speed, the oncoming airflow exerts sufficient pressure on the compensating damper, thereby pushing it open and increasing the intake air volume of the cooling fan to assist in heat dissipation. At low speeds or when stationary, due to insufficient oncoming air pressure, the compensating damper remains closed or partially closed to avoid unnecessary cooling airflow. This design, which uses air pressure to passively regulate the opening and closing of the compensating damper, is relatively simple but effectively utilizes the airflow to optimize cooling, especially at high speeds.

[0016] Therefore, the automotive cooling fan structure of this utility model has the following advantages:

[0017] 1. Compact Structure: The integrated design of the impeller and rotor housing reduces the number and complexity of parts, optimizes space utilization, and makes the overall structure more compact. A smaller hub dead zone, or a smaller axial dimension of the motor for the same hub diameter, is especially important for vehicles with limited axial space.

[0018] 2. Weight Reduction: The integrated design eliminates individual connecting components such as bolts and shafts, thereby reducing overall weight. This has a positive impact on improving fuel economy and enhancing vehicle performance.

[0019] 3. Improved reliability: By reducing the number of connecting parts, the likelihood of these parts becoming loose, damaged, or malfunctioning is lowered, thereby improving the integrity and lifespan of the system;

[0020] 4. High energy transfer efficiency: Since the impeller and rotor housing are integrated, energy absorption during the transfer between different components is avoided, thereby improving the working efficiency of the cooling fan;

[0021] 5. Reduced manufacturing and maintenance costs: Integrated design simplifies the manufacturing process and reduces the number of parts that need to be assembled, thereby reducing production and assembly costs;

[0022] 6. Reduced vibration and noise: By reducing connecting parts, the rigidity of the fan connection is improved, which can effectively reduce vibration and noise that may occur during high-speed rotation, resulting in better NVH performance;

[0023] 7. Excellent motor cooling effect: The airflow generated by the rotating blades stamped on the rotor housing directly cools the motor stator and rotor housing, resulting in better cooling effect.

[0024] The cooling fan device of this utility model adopts an impeller motor, which has a compact structure, lighter weight, higher integration, higher reliability, higher efficiency, lower cost, better NVH performance, and better cooling effect on the motor and its controller. Attached Figure Description

[0025] Figure 1 This is a 3D diagram of a car cooling fan structure.

[0026] Figure 2 yes Figure 1 A three-dimensional view of the explosion from another direction.

[0027] Figure 3 This is a three-dimensional view of the impeller rotor housing.

[0028] Figure 4 yes Figure 3 An enlarged 3D view of the inner rotor housing.

[0029] Figure 5 This is a perspective view of the rotor housing of Embodiment 2. Detailed Implementation

[0030] The technical solution of the utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0031] Example 1:

[0032] like Figure 1 and 2 As shown, the automotive cooling fan structure includes a fan frame assembly 1 and an impeller-type motor 2. The fan frame assembly 1 includes an outer frame 7, a base 6 located at the center of the outer frame 7, ribs 8 connecting the base 6 and the outer frame 7, and a plurality of compensating damper structures 9 mounted on the outer frame 7, with the compensating damper structures 9 located on both sides of the base 6. The compensating damper structure 9 includes an air inlet starting on the fan frame, a hinge shaft 10 at one end of the air inlet, and a damper plate 11 hinged to the hinge shaft.

[0033] The impeller motor 2 includes a stator 4, an impeller rotor assembly 3, and a controller. The controller includes a circuit board assembly (PCBA), a housing with heat dissipation features, and a wiring harness 5.

[0034] like Figure 3 and 4As shown, the impeller rotor assembly 3 includes an impeller and a rotor housing 21 located at the center of the impeller. The impeller is made of plastic, and the rotor housing 21 is made of alloy steel. The rotor housing is a cylinder with one open end, and it is integrally stamped from a steel plate. The rotor housing includes an end face and an annular face. A shaft hole 18 is provided at the center of the rotor housing, and a bearing and a bearing washer are installed at the shaft hole. A perforation structure is evenly distributed on the end face of the rotor housing 21. The perforation structure includes openings 17 on the end face, which are radially distributed with the rotor housing as the center, meaning that the extension line of the openings 17 passes through the center of the rotor housing 21. A guide plate is formed above the openings 17. The guide plate includes a long strip-shaped guide plate body 15 and guide plate connecting bodies 16 located on both sides of the guide plate body. The guide plate body 15 is an arc-shaped surface, and the guide plate connecting bodies 16 are spherical surfaces. The air guide plate increases the axial air intake space. The space between the stator 4 and the rotor housing end face forms an axial space. The airflow generated by the rotation of the blades 13 enters the axial space through the openings and is finally discharged from the annular space between the motor and the controller, thereby better cooling the motor and controller and improving the cooling effect. Multiple openings 19 are evenly distributed on the annular surface of the rotor housing to ensure the strong connection between the rotor housing 21 and the impeller during the integral injection molding of the rotor housing 21. Ferrite magnets 12 are evenly glued to the inner wall of the annular surface of the rotor housing 21. After the magnets 12 are glued, the rotor housing is placed in the mold to form the impeller rotor housing structure. The impeller includes blades 13 evenly distributed on the outer side of the rotor housing and a wheel rim 14 fixing the other end of the blades.

[0035] Example 2:

[0036] like Figure 5 As shown, unlike Embodiment 1, the air vent structure on the rotor housing includes an opening 17, and an air guide plate 20 integrally stamped from a steel plate above the opening 17. The air guide plate is an upward-curving elongated sheet, which increases the axial air intake space.

[0037] The specific embodiments described herein are merely illustrative examples of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A car cooling fan structure, comprising a fan frame, wherein an impeller motor is mounted at the center of the fan frame, characterized in that: The impeller motor includes a stator, an impeller rotor, and a controller. The impeller rotor includes an impeller and a rotor assembly located at the center of the impeller. The rotor assembly includes a rotor housing. A vent structure is provided on the end face of the rotor housing, and the vent structure forms a guide space in the axial direction.

2. The automotive cooling fan structure according to claim 1, characterized in that: The aforementioned air vent structure includes an opening on the end face, and an air guide plate is formed on the outer side of the rotor end face, with the air guide plate located above the opening.

3. The automotive cooling fan structure according to claim 2, characterized in that: The extension line of the opening passes through the center of the rotor.

4. The automotive cooling fan structure according to claim 2, characterized in that: The air guide plate includes the air guide plate body and the air guide plate connectors located on both sides. The air guide plate body is an arc shape and the air guide plate connectors are spherical.

5. The automotive cooling fan structure according to any one of claims 1 to 4, characterized in that: The rotor housing is a cylinder with one end open, the rotor is a metal part, the impeller has the rotor housing as the central hub, and the impeller and the rotor housing are injection molded as one piece.

6. The automotive cooling fan structure according to claim 5, characterized in that: Magnets are evenly distributed on the inner wall of the rotor housing. The rotor housing is made of magnetically conductive material and provides a magnetic circuit for two adjacent magnets.

7. The automotive cooling fan structure according to claim 5, characterized in that: A vent structure is provided on the bottom surface of the rotor housing, and an opening is provided on the annular surface of the rotor housing.

8. The automotive cooling fan structure according to any one of claims 1 to 4, characterized in that: The fan frame is equipped with a compensation damper structure, which is located on both sides of the impeller.

9. The automotive cooling fan structure according to claim 8, characterized in that: The aforementioned compensating damper structure includes a damper opening at the beginning of the fan frame, a hinge shaft at one end of the damper opening, and a damper plate hinged to the hinge shaft.

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