Brushless suction device

Abstract

The utility model relates to the field of motors, in particular to a brushless suction device. Comprising a shell, a power assembly, a bearing pack and a first guide fan, wherein the power assembly is provided with a driving motor and an air suction impeller; the driving motor comprises a stator and a rotor. The air suction impeller is coaxially fixed to the end, away from the stator, of the rotor. The bearing pack comprises a first bearing and a second bearing, and inner rings and outer rings of the first bearing and the second bearing are respectively connected with the rotor and the shell; the first guide fan is fixed to the machine shell and arranged between the stator and the air suction impeller. Part of the machine shell is constructed to be a bearing chamber, an elastic piece is arranged between the first bearing and the second bearing, and the elastic piece enables the first bearing and the second bearing to abut against the inner wall of the stator or the bearing chamber; the bearing chamber is provided with through heat dissipation holes, and wind power generated by the air suction impeller can enter the bearing chamber through the heat dissipation holes via the first guide fan.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to a brushless suction device. Background Technology

[0002] In traditional brushless suction devices, the rotor bearing assembly of the drive motor easily accumulates heat due to high-speed rotation and friction during prolonged operation, leading to a significant temperature rise. This, in turn, causes problems such as decreased bearing lubrication performance, accelerated wear, and even jamming, seriously affecting the reliability and lifespan of the equipment. Existing heat dissipation solutions mostly rely on external forced air cooling or passive cooling structures, which suffer from drawbacks such as chaotic airflow paths, low heat dissipation efficiency, and high energy consumption. In particular, they are difficult to achieve targeted and efficient cooling of critical components such as the bearing assembly.

[0003] Furthermore, most conventional brushless suction motors on the market rely on dual bearings for positioning using the housing and bracket, resulting in excessive positioning and overly complicated assembly, which affects the motor's lifespan and performance. Utility Model Content

[0004] The purpose of this invention is to provide a brushless suction device to solve the problems in the prior art where the bearing performance is reduced due to overheating during motor operation, and the bearing assembly is difficult.

[0005] The technical solution of this utility model is: a brushless suction device, comprising:

[0006] chassis;

[0007] A power assembly includes a drive motor and an intake impeller; the drive motor includes a stator and a rotor, and the intake impeller is coaxially fixed to the end of the rotor away from the stator.

[0008] The bearing assembly includes a first bearing and a second bearing, wherein the inner rings and outer rings of the first bearing and the second bearing are respectively connected to the rotor and the housing; and

[0009] The first guide fan is fixed to the housing and is located between the stator and the intake impeller;

[0010] A portion of the housing is configured as a bearing chamber, and an elastic element is provided between the first bearing and the second bearing, the elastic element causing the first bearing and the second bearing to abut against the stator or the inner wall of the bearing chamber.

[0011] The bearing chamber has through-holes for heat dissipation, and the airflow generated by the intake impeller can enter the bearing chamber through the heat dissipation holes via the first guide fan.

[0012] Preferably, the inner wall of the housing has an inwardly extending extension, one side of which is configured as part of a bearing chamber.

[0013] Preferably, the housing is constructed as a double-layer structure and a second guide fan is fixed thereon, the second guide fan being fixed between the double-layer structure of the housing.

[0014] Preferably, the first guide fan and the second guide fan have the same rotation direction.

[0015] Preferably, the first guide fan is fixed to the housing by fasteners arranged along the axial direction.

[0016] Preferably, the elastic element is a spring.

[0017] Compared with the prior art, the advantages of this utility model are:

[0018] (1) This application constructs a cooling airflow channel for cooling the bearing by setting a first guide fan between the stator and the intake impeller, and cooperating with the hollow structure of the extension of the inner wall of the housing and the heat dissipation holes.

[0019] (2) The second guide fan added inside the double-layer casing rotates in the same direction as the first guide fan. Through multi-stage flow optimization, the airflow path is avoided, the turbulence phenomenon of the traditional single-fan system is avoided, the ineffective wind resistance is reduced, and the energy consumption is reduced while improving the heat dissipation efficiency, ensuring the quiet operation of the whole machine and the balance of energy efficiency.

[0020] (3) This bearing assembly relies solely on the housing and springs to fix the first and second bearings, reducing the motor life problems caused by too many parts being positioned. Furthermore, the increased preload of the bearings effectively reduces the noise generated by the bearings.

[0021] (4) The elastic element can apply preload to the first and second bearings that abut against its two ends. While ensuring the stable positioning of the rotor, it can reserve thermal expansion space for the bearing assembly, avoid the stress concentration caused by metal deformation at high temperature, and further improve the operational stability under high temperature conditions. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is an exploded view of the structure of the brushless suction device described in this utility model;

[0024] Figure 2 This is a cross-sectional view of a brushless suction device according to the present invention;

[0025] Figure 3 This is a structural diagram of the bearing chamber described in this utility model;

[0026] Figure 4 This is a structural diagram of the housing described in this utility model;

[0027] The components are: 1. Housing, 11. Outer shell, 12. Inner shell, 13. Extension, 2. Power assembly, 21. Intake impeller, 22. Drive motor, 221. Stator, 222. Rotor, 3. Bearing assembly, 31. First bearing, 32. Second bearing, 33. Elastic element, 4. First guide fan, 5. Second guide fan, 6. Bearing chamber, 61. Heat dissipation hole. Detailed Implementation

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", 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 application 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 application.

[0029] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] The present invention will be further described in detail below with reference to specific embodiments:

[0032] like Figures 1-2 As shown, a brushless suction device includes a housing 1, within which a power assembly 2 is disposed. The power assembly 2 includes a suction impeller 21 and a drive motor 22 for driving the suction impeller 21 to rotate. The drive motor 22 includes a stator 221 and a rotor 222. A bearing assembly 3 is fitted onto the outer wall of the rotor 222, and the bearing assembly 3 is used to isolate the rotation of the rotor 222 from the housing 1.

[0033] During prolonged operation of the rotor 222, the bearing assembly 3 generates significant heat, thus affecting its operational performance. To address this issue, this application includes a first guide fan 4 positioned between the stator 221 and the intake impeller 21. The first guide fan 4 is fixed to the housing 1 and does not rotate with the intake impeller 21. Furthermore, as... Figure 3 As shown, a portion of the inner wall of the housing 1 is configured as a bearing chamber 6 to accommodate the bearing assembly 3, and multiple through holes are formed in the wall of the bearing chamber 6, which are configured as heat dissipation holes 61. The airflow generated by the rotation of the intake impeller 21 blows onto the first guide impeller, which deflects the airflow, causing some of the airflow to enter the bearing chamber 6 through the heat dissipation holes 61, thereby cooling the bearing.

[0034] Specifically, the intake impeller 21 is fixed to the end of the rotor 222 away from the stator 221, drawing outside air into the housing 1. The inner wall of the housing 1 has an inwardly extending extension 13, and the first guide fan 4 is fixed to the extension 13 by fasteners arranged along the axial direction.

[0035] The extension 13 has multiple cutouts along the axial direction, and these cutouts are connected to the heat dissipation holes 61 on the bearing chamber 6, so that the intake impeller 21, the first guide fan 4, the cutout structure of the extension 13 and the heat dissipation holes 61 form a cooling airflow channel for cooling the bearing assembly 3.

[0036] The bearing assembly 3 consists of two bearings: a first bearing 31 and a second bearing 32. The inner rings of both bearings 31 and 32 are fitted onto the outer wall of the rotor 222, and their outer rings abut against the extension 13 of the housing 1. An elastic element 33 is positioned between the first bearing 31 and the second bearing 32, with both ends abutting against the first bearing 31 and the second bearing 32, respectively. The elastic element 33 causes the end face of the first bearing 31 to abut against the extension 13 and the end face of the second bearing 32 to abut against the drive motor 22, thereby positioning the first bearing 31 and the second bearing 32. Compared to existing technologies, this bearing fixing method requires fewer positioning components, and the elastic element 33 can apply preload to the first bearing 31 and the second bearing 32 at their abutting ends. This ensures stable positioning of the rotor 222 while providing thermal expansion space for the bearing assembly 3, preventing stress concentration due to metal deformation at high temperatures, and further improving operational stability under high-temperature conditions. In this embodiment, the elastic element 33 is a spring.

[0037] In a preferred embodiment of this application, combined with Figure 4As shown, the housing 1 is configured with a double-layer structure, including an outer shell 11 and an inner shell 12, with the aforementioned extension 13 fixed to the inner shell 12. A second guide fan 5 is provided in the double-layer structure, and the rotation direction of the second guide fan 5 is the same as that of the first guide fan 4. After the airflow drawn in by the intake impeller 21 passes through the first guide fan 4, the portion of the airflow that does not enter the heat dissipation hole 61 can smoothly pass through the second guide fan 5. The second guide fan 5 cooperates with the first guide fan 4, allowing the airflow to flow smoothly in the same direction as the first guide fan 4 and then continue to flow smoothly in the same spiral direction as the second guide fan 5, thereby avoiding turbulence and making the airflow inside the housing 1 more orderly.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A brushless suction device, characterized in that, include: Casing (1); The power assembly (2) has a drive motor (22) and an intake impeller (21); the drive motor (22) includes a stator (221) and a rotor (222), and the intake impeller (21) is coaxially fixed to the end of the rotor (222) away from the stator (221); The bearing assembly (3) includes a first bearing (31) and a second bearing (32), the inner and outer rings of which are respectively connected to the rotor (222) and the housing (1); and The first guide fan (4) is fixed to the housing (1) and is located between the stator (221) and the suction impeller (21); A portion of the housing (1) is configured as a bearing chamber (6), and an elastic element (33) is provided between the first bearing (31) and the second bearing (32), the elastic element (33) causing the first bearing (31) and the second bearing (32) to abut against the stator (221) or the inner wall of the bearing chamber (6). The bearing chamber (6) has a through heat dissipation hole (61), and the wind generated by the intake impeller (21) can enter the bearing chamber (6) through the heat dissipation hole (61) via the first guide fan (4).

2. A brushless suction device according to claim 1, wherein The inner wall of the housing (1) has an inwardly extending extension (13), one side of which is configured as part of a bearing chamber.

3. A brushless suction device according to claim 2, wherein, The housing (1) is constructed as a double-layer structure and a second guide fan (5) is fixed thereon, the second guide fan (5) being fixed between the double-layer structure of the housing (1).

4. A brushless suction device according to claim 3, wherein The first guide fan (4) and the second guide fan (5) have the same rotation direction.

5. A brushless suction device according to claim 1, wherein The first guide fan (4) is fixed to the housing (1) by fasteners arranged along the axial direction.

6. A brushless suction device according to claim 1, wherein The elastic element (33) is a spring.

Images