A motor cooling structure

Abstract

The utility model relates to motor technical field discloses a motor cooling structure, including stator cylinder, upper and lower end cap, motor shaft, axial flow fan and shell. Stator cylinder both ends and end cap detachable connection form closed inner chamber, and motor shaft is supported by bearing assembly and drives coaxial fan rotation, and the shell and stator cylinder form air inlet cavity body. The lower end cap is equipped with double air inlet, and the upper end cap is equipped with inner chamber air outlet, and the shell top is equipped with total air outlet, and constructs solid body convection heat dissipation channel. Stator cylinder outer periphery cooling fin and annular spiral air duct cooperate and strengthen heat dissipation, and bearing assembly restricts motor shaft axial movement and ensures fan stable suction. The air inlet and air outlet circumferential array distribution form uniform air flow field, and axial flow fan rotation produces negative pressure and drives inner chamber airflow cooling stator winding, rotor and bearing, and outer cavity airflow is cooled stator cylinder through cooling fin, and two air flows are discharged after confluence, and the heat dissipation efficiency is improved significantly, has compact structure, maintains convenient, and stable operation and so on.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor cooling structure. Background Technology

[0002] As a core component of industrial drives, electric motors are prone to reduced efficiency, shortened lifespan, or even failure if the heat generated by components such as stator windings, rotors, and bearings cannot be dissipated in time during operation.

[0003] Traditional motor cooling structures often employ a single air duct or simple heat sink design, resulting in problems such as a single heat dissipation path, uneven airflow distribution, lack of dedicated bearing cooling, and poor maintenance convenience. As industrial equipment evolves towards higher speeds and higher power, traditional cooling structures can no longer meet the demands of motors for efficient heat dissipation, stable operation, and convenient maintenance.

[0004] Therefore, we propose a motor cooling structure. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a motor cooling structure, including a stator cylinder, an upper end cover, an axial flow fan, a motor shaft, a housing, and a lower end cover;

[0007] The stator cylinder is detachably connected to the lower end cover and the upper end cover at both ends, respectively, to form a closed inner cavity for accommodating the stator windings;

[0008] It also includes a bearing assembly, the motor shaft passes through the stator cylinder and is supported by the bearing assembly, the axial flow fan is coaxially arranged with the motor shaft and rotates with it, the outer shell is sleeved on the outer periphery of the lower end cover and forms an air inlet cavity with the stator cylinder, and the upper end cover, lower end cover and outer shell are respectively provided with airflow inlets and outlets to construct a convection heat dissipation channel.

[0009] Preferably, the bearing assembly includes an upper end cover bearing and a lower end cover bearing, respectively mounted on mounting seats inside the upper end cover and the lower end cover, for limiting the axial movement of the motor shaft and allowing it to rotate around the axis.

[0010] Preferably, the lower end cover is provided with at least two air inlets, namely a lower end cover inner cavity air inlet communicating with the inner cavity of the stator cylinder and a lower end cover outer shell air inlet communicating with the air inlet cavity between the outer shell and the stator cylinder; the upper end cover is provided with an upper end cover inner cavity air outlet communicating with the inner cavity of the stator cylinder, and the top of the outer shell is provided with a motor main air outlet.

[0011] Preferably, the air inlet in the lower end cover inner cavity, the air inlet in the lower end cover outer shell, the air outlet in the upper end cover inner cavity, and the main air outlet of the motor are all arranged in a circular array to form a uniform airflow field.

[0012] Preferably, the stator cylinder is provided with heat sinks on its outer periphery, and the heat sinks are located in the air inlet cavity between the outer shell and the stator cylinder, which is used to enhance heat dissipation from the outer wall of the stator cylinder.

[0013] Preferably, the stator cylinder is detachably connected to the lower end cover and the upper end cover via a rear flange and a front flange, respectively, to facilitate the installation and maintenance of the stator winding.

[0014] Preferably, it also includes an aviation connector, wherein a stator tube outlet hole is opened on the outer periphery of the stator tube, and the aviation connector is fixed to the outer periphery of the outer shell and aligned with the stator tube outlet hole, for guiding the connecting wire through and electrically connecting the stator winding.

[0015] Preferably, the axial flow fan is fixed to the inner wall of the outer casing and its axis coincides with the motor shaft. When it rotates, it forms a negative pressure in the air outlet of the upper end cover, the inner cavity of the stator cylinder and the air inlet cavity, driving the airflow in the inner cavity and the airflow in the outer cavity to flow upward and be discharged through the main air outlet of the motor.

[0016] Preferably, the air inlet cavity between the outer shell and the stator cylinder has an annular spiral structure, which, together with the circumferential array layout of the heat sink, forms a spiral air duct that enhances convection heat dissipation.

[0017] The beneficial effects of this utility model are as follows: By combining the dual air inlet design of the lower end cover (air inlet in the inner cavity of the lower end cover and air inlet in the outer shell) with the air outlet of the upper end cover and outer shell, a three-dimensional convection system is constructed in which the airflow in the inner cavity directly cools the stator windings, rotor and bearings, and the airflow in the outer cavity enhances the heat dissipation of the stator cylinder outer wall through heat sinks, significantly improving the synergistic heat dissipation efficiency of the core components and the stator cylinder; the bearing assembly adopts bidirectional constraint of the motor shaft by the upper and lower end cover bearings to ensure stable rotation of the axial flow fan to provide continuous and balanced suction power and avoid airflow instability problems; the air inlet and outlet are arranged in a circular array. The arrangement of airflow, combined with the annular spiral air duct and heat sink layout between the outer shell and the stator cylinder, creates a uniform airflow field and enhances heat exchange efficiency, effectively reducing the stator cylinder temperature. The detachable flange connection between the stator cylinder and the end cover, along with the integrated design of aviation connectors, balances maintenance convenience with reliable circuit connections. The negative pressure generated by the rotation of the axial flow fan drives two airflow paths to form a closed-loop cooling cycle, eliminating the need for additional drive devices. This reduces energy consumption while achieving efficient active cooling, comprehensively solving the problem of heat accumulation during motor operation and improving motor stability and service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 For practical purposes Figure 1 A schematic diagram of the front sectional view of the structure.

[0021] Figure 3 This is a schematic diagram of the airflow direction in a motor cooling structure.

[0022] Figure 4 for Figure 1 A cross-sectional schematic diagram of the upper end cover of a motor cooling structure;

[0023] Figure 5 for Figure 1 A cross-sectional view of the lower end cover of a motor cooling structure.

[0024] Reference numerals: 1-Stator winding; 2-Stator cylinder; 3-Heat sink; 4-Rotor; 5-Upper end cover bearing; 6-Aeronautical connector; 7-Upper end cover; 8-Axial flow fan; 9-Outer casing upper cover; 10-Front flange; 11-Motor shaft; 12-Outer casing; 13-Lower end cover bearing; 14-Rear flange; 15-Lower end cover; 101-Lower end cover inner cavity air inlet; 102-Lower end cover outer casing air inlet; 103-Upper end cover inner cavity air outlet; 104-Motor main air outlet; 201-Stator cylinder wire outlet hole. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0028] Example

[0029] Reference Figures 1-5 This is the first embodiment of the present invention, which provides a motor cooling structure;

[0030] Specifically, this utility model includes a lower end cover 15, a stator cylinder 2, an upper end cover 7, a motor shaft 11, a housing 12, and an axial flow fan 8;

[0031] The stator cylinder 2 is detachably connected to the lower end cover 15 via the rear flange 14. The stator cylinder 2 houses the stator winding 1. The other end is fixedly connected to the upper end cover 7 via the front flange 10, forming a closed motor cavity. The upper end cover 7 has an air outlet 103 in a circular array on its inner cavity, and the lower end cover 15 has an air inlet 101 in the inner cavity at the corresponding position. The two serve as the outlet and inlet of the airflow in the inner cavity, respectively.

[0032] The motor shaft 11 passes through the stator cylinder 2. Its two ends are supported by the mounting seats inside the upper end cover 7 and the lower end cover 15 through the upper end cover bearing 5 and the lower end cover bearing 13. That is, the inner rings of the upper end cover bearing 5 and the lower end cover bearing 13 are interference-fitted with the motor shaft 11. The outer rings of the upper end cover bearing 5 and the lower end cover bearing 13 are fixed by mounting seat one and mounting seat two respectively to restrict the axial movement of the motor shaft 11, allowing it to rotate only around the axis. The axial flow fan 8 is fixed to the inner wall of the outer casing 12. Its axis is coaxial with the motor shaft 11. When it rotates synchronously with the motor shaft 11, it generates an upward suction force.

[0033] The outer casing 12 is fitted onto the outer circumferential surface of the lower end cover 15, forming an annular air inlet cavity between it and the stator cylinder 2. The end face of the lower end cover 15 has an air inlet 102 arranged in a circular array at the bottom of the outer casing 12, and a number of heat sinks 3 are arranged in a circular array on the outer circumference of the stator cylinder 2. When the motor is running, external air enters from the air inlet 102 of the lower end cover and rises spirally along the surface of the heat sinks 3, thereby increasing the contact area and enhancing the heat dissipation of the outer wall of the stator cylinder 2. The upper casing 9 at the top of the outer casing 12 has a motor main air outlet 104, which serves as the exhaust channel for the final heat dissipation airflow.

[0034] When the axial flow fan 8 rotates with the motor shaft 11, its suction effect first creates a continuous negative pressure in the air outlet 103 of the upper end cover, the inner cavity of the stator cylinder 2, and the air inlet cavity of the outer shell 12.

[0035] Furthermore, fresh air rushes in from the air inlet 101 inside the lower end cover cavity, first flowing through the area where the lower end cover bearing 13 is located, and carrying away the heat of bearing operation through direct contact; then it rises along the air gap between the stator winding 1 and the rotor 4, fully contacting the surface of the stator winding 1 to absorb the heat of electricity, and cooling the outer periphery of the rotor 4; when the airflow reaches the upper end cover 7, it enters the installation area of ​​the upper end cover bearing 5 for secondary cooling, and finally flows into the suction range of the axial flow fan 8 through the air outlet 103 inside the upper end cover cavity.

[0036] Furthermore, another stream of fresh air enters the interlayer between the outer casing 12 and the stator cylinder 2 from the air inlet 102 of the lower end cover casing, spirals upward along the heat sink 3, absorbs the heat conducted to the outer wall by the stator cylinder 2, and then flows upward.

[0037] Two streams of air carrying heat converge below the axial flow fan 8. After being accelerated by the fan blades, they are discharged outside the motor through the motor's main air outlet 104 on the outer casing cover 9. Due to the bidirectional constraint of the upper end cover bearing 5 and the lower end cover bearing 13 on the motor shaft 11, the axial flow fan 8 is ensured to operate stably. The airflow in the inner cavity directly cools the rotor 4, stator winding 1 and bearings, while the airflow in the outer cavity indirectly cools the stator cylinder 2 through the heat sink 3, forming a three-dimensional convection cooling system that runs through the upper and lower parts of the motor.

[0038] The stator cylinder 2 has a stator cylinder outlet hole 201 on its outer periphery. The outer periphery of the outer shell 12 is fixed with an aviation connector 6 through mounting holes. The conductive end of the connecting wire passes through the aviation connector 6 and the stator cylinder outlet hole 201 in sequence, and enters the interior of the stator cylinder 2 to be electrically connected to the stator winding 1. This structure ensures the reliability of the circuit connection while providing a through channel for the airflow in the inner cavity.

[0039] In summary, this utility model, through the layout of the lower end cover 15 with dual air inlets (lower end cover inner cavity air inlet 101 and lower end cover outer shell air inlet 102), the upper end cover 7 with air outlet 103 and the outer shell upper cover 9 with total air outlet 104, combined with the bearing constraint structure and heat sink 3 design, achieves coordinated heat dissipation of the motor core components and stator cylinder, effectively solving the problem of heat accumulation during high-speed operation.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A motor cooling structure, characterized in that: It includes a stator cylinder (2), an upper end cover (7), an axial flow fan (8), a motor shaft (11), a housing (12), and a lower end cover (15); The stator cylinder (2) is detachably connected to the lower end cover (15) and the upper end cover (7) at both ends to form a closed inner cavity for accommodating the stator winding (1); It also includes a bearing assembly. The motor shaft (11) passes through the stator cylinder (2) and is supported by the bearing assembly. The axial flow fan (8) is coaxially arranged with the motor shaft (11) and rotates with it. The outer shell (12) is sleeved on the outer periphery of the lower end cover (15) and forms an air inlet cavity with the stator cylinder (2). The upper end cover (7), the lower end cover (15) and the outer shell (12) are respectively provided with airflow inlets and outlets to construct a convection heat dissipation channel.

2. The motor cooling structure according to claim 1, characterized in that: The bearing assembly includes an upper end cover bearing (5) and a lower end cover bearing (13), respectively mounted on mounting seats inside the upper end cover (7) and the lower end cover (15), for limiting the axial movement of the motor shaft (11) and allowing it to rotate around the axis.

3. The motor cooling structure according to claim 1, characterized in that: The lower end cover (15) is provided with at least two air inlets, namely the lower end cover inner cavity air inlet (101) which communicates with the inner cavity of the stator cylinder (2) and the lower end cover outer shell air inlet (102) which communicates with the air inlet cavity between the outer shell (12) and the stator cylinder (2); the upper end cover (7) is provided with the upper end cover inner cavity air outlet (103) which communicates with the inner cavity of the stator cylinder (2), and the top of the outer shell (12) is provided with the motor main air outlet (104).

4. The motor cooling structure according to claim 3, characterized in that: The air inlet (101) of the lower end cover inner cavity, the air inlet (102) of the lower end cover outer shell, the air outlet (103) of the upper end cover inner cavity, and the main air outlet (104) of the motor are all arranged in a circular array to form a uniform airflow field.

5. The motor cooling structure according to claim 1, characterized in that: The stator cylinder (2) is provided with heat sink (3) on its outer periphery. The heat sink (3) is located in the air inlet cavity between the outer shell (12) and the stator cylinder (2) and is used to enhance the heat dissipation of the outer wall of the stator cylinder (2).

6. The motor cooling structure according to claim 1, characterized in that: The stator cylinder (2) is detachably connected to the lower end cover (15) and the upper end cover (7) via the rear flange (14) and the front flange (10) respectively, so as to facilitate the installation and maintenance of the stator winding (1).

7. The motor cooling structure according to claim 1, characterized in that: It also includes an aviation connector (6), with a stator tube outlet hole (201) opened on the outer periphery of the stator tube (2). The aviation connector (6) is fixed to the outer periphery of the outer shell (12) and aligned with the stator tube outlet hole (201) to guide the connecting wire through and electrically connect to the stator winding (1).

8. The motor cooling structure according to claim 1, characterized in that: The axial flow fan (8) is fixed to the inner wall of the outer shell (12) and its axis coincides with the motor shaft (11). When it rotates, it forms a negative pressure in the air outlet (103) of the upper end cover, the inner cavity of the stator cylinder (2) and the air inlet cavity, driving the airflow in the inner cavity and the airflow in the outer cavity to flow upward and be discharged through the motor's main air outlet (104).

9. A motor cooling structure according to any one of claims 1-8, characterized in that: The air inlet cavity between the outer shell (12) and the stator cylinder (2) has an annular spiral structure, which, together with the circumferential array layout of the heat sink (3), forms a spiral air duct that enhances convection heat dissipation.

Images