Motor with housing cooling structure

Abstract

This utility model discloses a motor with a cooling structure for the outer casing, including a motor casing, a cooling fan, and a guide shield. The motor casing has a rotating shaft inside, with both ends extending to the outer side of the motor casing. The cooling fan is mounted on one side of the shaft protruding from the rear of the motor casing. The guide shield is located at the rear of the motor casing. The motor casing has a square structure with grooves at its four corners. The guide shield includes a circular cover and an annular sidewall integrally formed with the outer periphery of the circular cover. A first air inlet is formed in the center of the circular cover. Several air vents are formed between the inner circumferential surface of the guide shield and the surface of the motor casing. This solution, through the combination of an external fan and a guide shield, achieves a uniform and reliable cooling effect for the outer casing without occupying the limited internal space of the motor.

Description

Technical Field

[0001] This utility model belongs to the field of motor cooling technology, specifically relating to a motor with a housing cooling structure. Background Technology

[0002] During operation, the stator windings and rotor of an electric motor generate a significant amount of heat. Insufficient heat dissipation can lead to excessive temperature rise, affecting motor efficiency, lifespan, and potentially causing insulation aging or motor failure. In existing technologies, to enhance heat dissipation, cooling fans are typically installed inside the motor, directly mounted on the rotor or shaft. These fans generate airflow within the motor through rotating blades, achieving internal air circulation and thus aiding in heat dissipation. However, since the fan is located inside the motor, it occupies limited internal space.

[0003] Chinese Patent Application No. 2021221048326 discloses a high-efficiency heat dissipation household air conditioner motor, including a central rotating shaft; a motor body is sleeved on the outside of the central rotating shaft; a heat dissipation box is fixedly connected to the end of the motor body; a cooling fan is provided inside the heat dissipation box; the cooling fan is fixedly connected to the central rotating shaft; a pair of heat-conducting copper pipes are fixedly connected inside the heat dissipation box; the heat-conducting copper pipes are bent; the heat-conducting copper pipes are fixedly connected to the end of the motor body; multiple sets of water storage tanks are formed on the surface of the heat-conducting copper pipes; and sponge pads are fixedly connected to the water storage tanks.

[0004] The above solution uses a heat sink with a cooling fan inside to dissipate heat from the motor's internal components, avoiding encroachment on the limited internal space. However, the airflow generated by the internal fan is mostly concentrated inside the stator or rotor, making it difficult to distribute evenly across the entire motor casing, resulting in low overall heat exchange efficiency. Under high load or continuous operation, the internal fan's cooling effect is often insufficient, and maintaining and replacing the fan is also inconvenient. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses a motor with a cooling structure, comprising a motor housing, a cooling fan, and a guide shield. The motor housing has a rotating shaft inside, with both ends extending to the outer sides of the motor housing. The cooling fan is mounted on the side of the rotating shaft protruding from the rear of the motor housing. The guide shield is located at the rear of the motor housing. The motor housing has a square structure with recessed structures at its four corners. The guide shield includes a circular cover and an annular sidewall integrally formed with the outer periphery of the circular cover. A first air inlet is formed in the center of the circular cover, and several air vents are formed between the inner circumferential surface of the guide shield and the surface of the motor housing.

[0006] Preferably, the circular cover has a plurality of second air inlets surrounding the first air inlet, wherein the first air inlet is a circular groove structure and the second air inlets are strip groove structures.

[0007] Preferably, the rear side of the motor housing is provided with a bolt connection seat, and the annular sidewall is provided with a corresponding bolt connection hole, and a locking bolt is provided in the bolt connection hole.

[0008] Preferably, a plurality of heat sinks are provided axially on the surface of the motor housing.

[0009] Preferably, the rotating shaft protruding from the rear of the motor housing is a D-shaped shaft, the cooling fan has a hub in the middle, the hub has a D-shaped groove, the hub has a radial set screw on its side, the D-shaped shaft has a locking hole, and the hub is fastened to the D-shaped shaft by the radial set screw.

[0010] The advantages of this utility model are: 1. The combination of the external fan and the guide shield in this solution creates a stable and uniform airflow along the surface of the motor housing, fully covering the grooves and heat sink areas, significantly reducing the temperature of the motor housing, and improving the reliability and lifespan of the motor under high load or continuous operation conditions.

[0011] 2. In this design, the fan is located outside the motor, which does not occupy the limited space inside the motor and reduces interference with the internal structure. At the same time, the bolt-fixed protective cover design makes it easier to disassemble, clean or replace the fan and the protective cover, reducing maintenance costs.

[0012] 3. In this solution, the combination of a circular central air inlet and a surrounding strip air inlet, as well as the air outlet and groove guide formed by the shield and square outer shell, can optimize the airflow path, reduce fan load and noise, while ensuring cooling effect. Attached Figure Description

[0013] Figure 1 This is a three-dimensional rear view structural diagram of the present invention.

[0014] Figure 2 This is a three-dimensional front view structural diagram of the present invention.

[0015] Figure 3 This is a cross-sectional view of the tail section of the motor of this utility model.

[0016] Figure 4 This is a schematic diagram of the external cooling structure of this utility model.

[0017] Figure 5 This is a diagram showing the airflow direction for cooling in this invention.

[0018] In the diagram: 1 Motor housing, 2 Cooling fan, 3 Guide shield, 4 Shaft, 5 Groove structure, 6 Circular cover, 7 Annular sidewall, 8 First air inlet, 9 Air outlet, 10 Second air inlet, 11 Bolt connection seat, 12 Bolt connection hole, 13 Locking bolt, 14 Heat sink, 15 D-shaped shaft, 16 Hub, 17 D-shaped groove, 18 Radial set screw. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1-3 As shown, a motor with a cooling structure includes a motor housing 1, a cooling fan 2, and a guide shield 3. The motor housing 1 has a square structure and a rotatable shaft 4 is provided inside. Both ends of the shaft 4 extend to the outside of the motor housing 1 to connect with the cooling fan 2 and other transmission components.

[0023] The cooling fan 2 is mounted on one side of the rotating shaft 4 that protrudes from the rear of the motor housing 1. The cooling fan 2 includes a hub 16 and several blades, which are evenly distributed along the outer circumference of the hub 16. The hub 16 has a D-shaped groove 17 in the middle that mates with the D-shaped shaft 15 at the rear of the rotating shaft 4. The hub 16 and the D-shaped shaft 15 are securely connected by radial set screws 18, ensuring that the fan rotates synchronously with the rotating shaft 4 and preventing slippage or deflection. This structure ensures both fan stability and improved transmission reliability. During operation, the cooling fan 2 rotates at high speed under the drive of the rotating shaft 4, generating a stable airflow to provide continuous cooling for the motor housing 1.

[0024] A guide shield 3 is located at the rear of the motor housing 1 to guide the airflow generated by the cooling fan 2 along the surface of the motor housing 1, achieving forced convection cooling. The guide shield 3 includes a circular cover 6 and an annular sidewall 7 integrally formed and connected to the outer periphery of the circular cover 6. A first air inlet 8 is provided in the center of the circular cover 6 for air intake. Several second air inlets 10 are provided around the first air inlet 8 on the circular cover 6. The first air inlet 8 has a circular groove structure, and the second air inlets 10 have a strip groove structure. The first air inlet 8 is located at the center of the circular cover 6, serving as the main air intake, allowing air to enter directly from the center and forming a core airflow inside the guide shield 3. The second air inlets 10 serve as auxiliary air intakes, so that the airflow is dispersed after passing through the surrounding second air inlets 10, reducing airflow resistance and lightening the load on the cooling fan 2. This can reduce fan noise and energy consumption while maintaining heat dissipation effect.

[0025] Combination Figure 4 The guide shield 3 and the motor housing 1 do not completely overlap in shape. The guide shield 3 has a circular cross-section, while the motor housing 1 has a square cross-section. This misalignment creates several air vents 9 between the guide shield 3 and the housing. These vents 9 guide the airflow generated by the fan to circulate along the surface of the housing, thereby improving the overall heat dissipation of the housing. Air flows through these vents 9 along the surface of the motor housing 1, rapidly carrying away heat and improving heat dissipation efficiency. The motor housing 1 has recessed structures 5 at its four corners. These recesses provide additional air outlet channels within the airflow space formed by the guide shield 3, thereby increasing the area of ​​the air vents 9, optimizing airflow distribution, and enhancing the overall cooling effect of the housing.

[0026] A bolt connection seat 11 is provided on the rear side of the motor housing 1, and a bolt connection hole 12 is correspondingly provided on the annular sidewall 7, equipped with a locking bolt 13, to ensure that the guide cover 3 can be stably fixed to the motor housing 1, while facilitating disassembly and maintenance. To further enhance the heat dissipation effect, several heat sinks 14 are arranged axially on the surface of the motor housing 1, increasing the heat dissipation surface area of ​​the motor housing 1. The airflow forms turbulence when passing through the heat sinks 14, thereby further improving the heat exchange efficiency. The airflow generated by the cooling fan 2 passes through the air outlet 9 of the guide cover 3 and flows along the surface of the heat sinks 14, realizing the overall cooling of the motor housing 1.

[0027] When the motor is running, the shaft 4 drives the cooling fan 2 to rotate. The fan blades draw in air and guide the airflow to the surface of the motor housing 1 along the air outlet 9 formed by the guide cover 3. The airflow direction is as follows: Figure 5 As indicated by the arrows, airflow flows evenly along the grooves and the surface of the motor housing 1, effectively removing heat from the housing. The fan is externally mounted on the motor, not occupying internal space, while the design of the guide shield 3 ensures even airflow distribution, preventing localized overheating. This entire cooling structure not only improves the motor's heat dissipation efficiency but also reduces internal temperature rise, extending motor lifespan, making it particularly suitable for high-load and continuous operation conditions.

[0028] The fit between the D-shaped shaft 15 and the hub 16 not only prevents the fan from slipping during rotation but also ensures transmission stability. The radial set screw 18 further facilitates the disassembly, assembly, and maintenance of the fan. The circular cover 6 and annular sidewall 7 of the guide shroud 3 are bolted to the rear of the motor housing 1, ensuring the overall structural stability and allowing adjustment of the gap between the shroud and the housing as needed to change the size of the air outlet 9, thereby optimizing the airflow path and cooling effect.

[0029] This embodiment achieves efficient overall cooling of the casing, uniform airflow distribution from the fan, and full utilization of the heat dissipation area. It also features a simple structure, facilitating maintenance and disassembly. This embodiment boasts advantages such as high heat dissipation efficiency, high airflow utilization, compact structure, and convenient maintenance, meeting the stable operating requirements under high load and long-term continuous operation conditions. Furthermore, because the fan is located outside the motor, the motor's internal components are less susceptible to dust and foreign objects during operation, enhancing the reliability and safety of motor operation. Simultaneously, the external fan design facilitates maintenance and replacement; the fan and casing can be cleaned or replaced without disassembling internal motor components, significantly reducing maintenance costs.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric machine with a housing cooling structure, characterized by: The device includes a motor housing (1), a cooling fan (2), and a guide shield (3). The motor housing (1) has a rotating shaft (4) inside, with both ends of the shaft (4) extending to the outside of the motor housing (1). The cooling fan (2) is mounted on one side of the shaft (4) protruding from the tail of the motor housing (1). The guide shield (3) is located at the tail of the motor housing (1). The motor housing (1) has a square structure and groove structures (5) are provided at the four corners of the motor housing (1). The guide shield (3) includes a circular cover (6) and an annular sidewall (7) integrally formed and connected to the outer periphery of the circular cover (6). A first air inlet (8) is provided in the middle of the circular cover (6). Several air outlets (9) are formed between the inner circumferential surface of the guide shield (3) and the surface of the motor housing (1).

2. The electric machine with housing cooling structure of claim 1, wherein: The circular cover (6) is provided with several second air inlets (10) surrounding the first air inlet (8). The first air inlet (8) is a circular groove structure, and the second air inlets (10) are strip groove structures.

3. The electric machine with housing cooling structure of claim 2, wherein: The motor housing (1) has a bolt connection seat (11) on the rear side, and a bolt connection hole (12) is provided on the annular sidewall (7), and a locking bolt (13) is provided on the bolt connection hole (12).

4. The electric machine with housing cooling structure of claim 3, wherein: The surface of the motor housing (1) is provided with several heat sinks (14) axially.

5. The electric machine with housing cooling structure of claim 4, wherein: The rotating shaft (4) protrudes from the tail of the motor housing (1) on one side as a D-shaped shaft (15). The cooling fan (2) has a hub (16) in the middle. The hub (16) has a D-shaped groove (17). The hub (16) has a radial set screw (18) on its side. The D-shaped shaft (15) has a locking hole. The hub (16) is fastened to the D-shaped shaft (15) by the radial set screw (18).

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