Rotor assembly, motor, dust collector, and blower

Abstract

The present invention relates to the field of motors, and in particular to a rotor assembly, a motor, a dust collector, and a blower. The rotor assembly comprises a rotating shaft, wherein an impeller is provided at the upper end of the rotating shaft, a buffer part is sleeved on the upper portion of the rotating shaft, bearings are provided on the upper and lower sides of the buffer part, respectively, and a magnetic ring is provided at the lower portion of the rotating shaft. The beneficial effects of the present invention are that: by respectively providing the impeller and the magnetic ring on the upper and lower sides of the bearings, and ensuring that the distance between the upper and lower end surfaces of the two bearings is greater than or equal to one-third of the distance between the upper end surface of the impeller and the lower end surface of the magnetic ring, is greater than the distance between the upper and lower end surfaces of the impeller, and is greater than the distance between the upper and lower end surfaces of the magnetic ring, the bearings and a bearing chamber can effectively support the entire rotor assembly, so that loads on the two bearings are relatively balanced, ensuring the reliability of the rotor assembly.

Description

Rotor assembly, motor, vacuum cleaner, and hair dryer Technical Field

[0001] The present invention relates to the field of motors, and in particular to a rotor assembly, a motor, a vacuum cleaner, and a hair dryer. Background Art

[0002] A conventional motor rotor assembly typically includes a rotating shaft, an impeller mounted on the shaft, magnets, and a bearing assembly. The bearing assembly includes at least two bearings. When the bearing assembly includes two bearings, the two bearings are mounted on either end of the shaft, the magnet is mounted on the shaft between the two bearings, and the impeller is mounted on the shaft outside the two bearings.

[0003] The two bearings are installed in two separate bearing chambers. These chambers are often located on different components, and the coaxiality of the two chambers is ensured by the mutual cooperation of the components. The two bearings need to be installed separately during installation, so there is a certain amount of installation error between the bearings, resulting in significant differences in the coaxiality of different bearings. When the rotor runs at high speed, the coaxiality differences between the different bearings cause the shaft to rotate eccentrically, resulting in increased bearing wear and shortening the life of the motor.

[0004] In addition, since the magnetic ring is located between the two bearings and the impeller is located outside the two bearings, the bearing close to the impeller side is subjected to a greater load, the bearing is easily damaged, and the service life is reduced.

[0005] Summary of the Invention

[0006] In order to overcome the above-mentioned shortcomings, the present invention provides a technical solution that can solve the above-mentioned problems.

[0007] A rotor assembly includes a rotating shaft;

[0008] An impeller is provided at the upper end of the rotating shaft, a buffer portion is sleeved on the upper portion of the rotating shaft, bearings are provided on the upper and lower sides of the buffer portion, and a magnetic ring is provided at the lower portion of the rotating shaft;

[0009] The distance between the upper and lower end faces of the two bearings is greater than or equal to 1 / 3 of the distance from the upper end face of the impeller to the lower end face of the magnetic ring, the distance between the upper and lower end faces of the two bearings is greater than the distance between the upper and lower end faces of the impeller, and the distance between the upper and lower end faces of the two bearings is greater than the distance between the upper and lower end faces of the magnetic ring.

[0010] As a further solution of the present invention: a bearing chamber is provided on the outer side of the bearing, the bearing chamber is integrally processed and formed, and the outer diameter of the bearing chamber is larger than the outer diameter of the magnetic ring.

[0011] As a further solution of the present invention: the impeller, the bearing chamber and the magnetic ring are all clearance-fitted with each other.

[0012] As a further solution of the present invention: the outer diameter of the bearing is larger than the outer diameter of the magnetic ring.

[0013] As a further solution of the present invention, the upper end of the bearing protrudes upward from the fixing portion of the impeller.

[0014] As a further solution of the present invention: a balance ring is provided at the lower end of the magnetic ring.

[0015] As a further solution of the present invention: an impeller cover is provided at the upper end of the impeller.

[0016] According to another aspect of the present application, an embodiment of the present invention provides a motor including the above-mentioned rotor assembly.

[0017] As a further solution of the present invention: it also includes an air duct, and the rotor assembly is arranged in the inner middle part of the air duct.

[0018] As a further solution of the present invention: there is a gap or transition fit between the bearing chamber and the air duct.

[0019] As a further solution of the present invention, the bearing chamber and the air duct are interference fit with each other.

[0020] As a further solution of the present invention: a control panel is provided at the lower end of the air duct, and a bottom cover is provided at the lower end of the control panel.

[0021] According to another aspect of the present application, an embodiment of the present invention provides a vacuum cleaner comprising the above-mentioned motor.

[0022] According to another aspect of the present application, an embodiment of the present invention provides a hair dryer including the above-mentioned motor.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By arranging the impeller and the magnetic ring on the upper and lower sides of the bearing respectively, and the distance between the upper and lower end faces of the two bearings is greater than or equal to 1 / 3 of the distance from the upper end face of the impeller to the lower end face of the magnetic ring, the distance between the upper and lower end faces of the two bearings is greater than the distance between the upper and lower end faces of the impeller, and the distance between the upper and lower end faces of the two bearings is greater than the distance between the upper and lower end faces of the magnetic ring, the bearings and the bearing chamber can effectively support the entire rotor assembly, so that the loads on the two bearings are relatively balanced, thereby ensuring the reliability of the rotor assembly;

[0025] 2. Since the bearing chamber is integrally processed and formed, the two bearings are installed in the bearing chamber at the same time, avoiding problems such as coaxiality difference caused by installation errors. The two bearings can run relatively more smoothly and stably, avoiding bearing wear and noise problems caused by coaxiality difference.

[0026] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the following briefly introduces the drawings required for use in the embodiment or the prior art description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a schematic diagram of the rotor structure.

[0029] Figure 2 is a schematic diagram of the structure of the motor.

[0030] Shown in the figure: 1. Air duct; 2. Bottom cover; 3. Rotor assembly; 4. Impeller; 5. Rotating shaft; 6. Buffer; 7. Bearing; 8. Magnetic ring; 9. Bearing chamber; 10. Balance ring; 11. Impeller cover; 12. Air duct partition; 13. Control panel. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0033] 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0034] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] 1-2 , a rotor assembly includes a rotating shaft 5 ;

[0036] The upper end of the rotating shaft 5 is provided with an impeller 4, the upper part of the rotating shaft 5 is sleeved with a buffer portion 6, the upper and lower sides of the buffer portion 6 are respectively provided with bearings 7, and the lower part of the rotating shaft 5 is provided with a magnetic ring 8;

[0037] The distance between the upper and lower end faces of the two bearings 7 is greater than or equal to 1 / 3 of the distance from the upper end face of the impeller 4 to the lower end face of the magnetic ring 8. The distance between the upper and lower end faces of the two bearings 7 is greater than the distance between the upper and lower end faces of the impeller 4. The distance between the upper and lower end faces of the two bearings 7 is greater than the distance between the upper and lower end faces of the magnetic ring 8.

[0038] The height of the magnetic ring 8 is H1, the distance between the upper and lower end surfaces of the two bearings 7 is H2, the height of the impeller 4 is H3, the distance from the lower end surface of the magnetic ring 8 to the fixed part of the impeller 4 is H4, the distance from the lower end surface of the magnetic ring 8 to the upper end surface of the rotating shaft 5 is H5, and the distance from the lower end surface of the magnetic ring 8 to the upper end surface of the impeller 4 is H6, that is, H2 is greater than or equal to 1 / 3H6; H2 is greater than H3; H2 is greater than H1;

[0039] By installing the impeller 4 and the magnetic ring 8 on the upper and lower sides of the bearing 7, respectively, on different sides, the two bearings 7 are located at the physical midpoint between the impeller 4 and the magnetic ring 8. By limiting the positional distance relationship between the various parts on the rotating shaft 5, the purpose is to enable the bearings 7 to effectively support the entire rotor assembly 3, so that the loads on the two bearings 7 are relatively balanced, thereby ensuring the reliability of the rotor assembly 3;

[0040] As a further solution of the present invention, a bearing chamber 9 is provided on the outer side of the bearing 7 , the bearing chamber 9 is integrally formed, and the outer diameter of the bearing chamber 9 is larger than the outer diameter of the magnetic ring 8 .

[0041] The outer diameter of the bearing chamber 9 is L1, the outer diameter of the bearing 7 is L2, and the outer diameter of the magnetic ring 8 is L3; that is, L1 is greater than L3;

[0042] Since the bearing chamber 9 is integrally formed, the two bearings 7 are installed in the bearing chamber 9 at the same time, thereby avoiding problems such as coaxiality difference caused by installation errors. The two bearings 7 can run relatively more smoothly and stably, avoiding wear on the bearings 7 and noise problems caused by coaxiality difference.

[0043] The outer diameter of the bearing chamber 9 is larger than the outer diameter of the magnetic ring 8. The purpose of this arrangement is to allow the entire rotor assembly 3 to be directly inserted from one side of the motor during installation, avoiding the need to insert the rotor assembly 3 first and then install the impeller 4; and the rotor assembly 3 can form a component independent of the motor; the rotor assembly 3 can be dynamically balanced together with the impeller 4, avoiding errors caused by the independent dynamic balancing of the impeller 4 and the rotor assembly 3 before installation, and only one dynamic balance correction is required, and the noise hearing is better.

[0044] As a further solution of the present invention, the impeller 4, the bearing chamber 9, and the magnetic ring 8 are all clearance-fitted with each other.

[0045] The reliability of the rotor assembly 3 can be effectively guaranteed.

[0046] As a further solution of the present invention: the outer diameter of the bearing 7 is larger than the outer diameter of the magnetic ring 8.

[0047] The radial load on the bearing 7 can be effectively guaranteed, thereby increasing the service life of the bearing 7.

[0048] As a further solution of the present invention, the upper end of the bearing 7 protrudes upward from the fixing portion of the impeller 4 .

[0049] This enables the rotating shaft 5 to more effectively support the various parts of the entire rotor assembly 3 .

[0050] As a further solution of the present invention, a balance ring 10 is provided at the lower end of the magnetic ring 8 .

[0051] The rotation balance of the rotating shaft 5 can be maintained, thereby improving stability.

[0052] As a further solution of the present invention, an impeller cover 11 is provided at the upper end of the impeller 4 .

[0053] The impeller 4 can be protected and its service life can be increased.

[0054] It has been verified through experiments that the life of the rotor assembly using this axial size (H2≥1 / 3H6; H2>H3; H2>H1) can reach 1000h+;

[0055] The life of the rotor assembly of H2<1 / 3H6 is only about 300h;

[0056] The life of the rotor assembly of H2

[0057] ​The life of the rotor assembly of H2<H3 is about 450h;

[0058] Abnormality level: disassembly (including dust cover falling off) > looseness > jamming > abnormal noise;

[0059] With this radial dimension, the rotor assembly is installed at one time and the overall dynamic balance of the rotor assembly is achieved at one time. The noise level is significantly better than that of conventional structures, and the listening experience is softer without obvious sharp sounds.

[0060] According to another aspect of the present application, an embodiment of the present invention provides a motor, comprising the above-mentioned rotor assembly 3 .

[0061] As a further solution of the present invention: an air duct is also included, and the rotor assembly 3 is arranged in the inner middle part of the air duct 1.

[0062] The inner diameter of the bearing chamber 9 at one end of the air duct 1 is L4; by arranging the rotor structure 3 inside the air duct 1, the motor as a whole has reliability and reduces the impact of noise.

[0063] As a further solution of the present invention, there is a gap or transition fit between the bearing chamber 9 and the air duct 1 .

[0064] This ensures that the rotor assembly 3 can be smoothly installed in the air inlet duct 1 and avoids the inner and outer rings of the bearing 7 being stressed at the same time, thereby increasing the service life.

[0065] Another embodiment: As a further solution of the present invention: the bearing chamber 9 and the air duct 1 are interference fit with each other.

[0066] By utilizing the properties of the processing materials of the bearing chamber 9 and the air duct 1, the bearing chamber 9 can be stably fixed inside the air duct 1, ensuring that the bearing chamber 9 can be stably stressed and the service life is increased.

[0067] As a further solution of the present invention: a control panel 13 is provided at the lower end of the air duct 1 , and a bottom cover 2 is provided at the lower end of the control panel 13 .

[0068] It can be used to electrically control the motor and protect the control board.

[0069] According to another aspect of the present application, an embodiment of the present invention provides a vacuum cleaner comprising the above-mentioned motor.

[0070] Since the above-mentioned motor is adopted, it has at least the beneficial effects of the motor in the above-mentioned embodiment, and the details will not be repeated; other structures of the vacuum cleaner are not described or limited. They are existing conventional structures, and those skilled in the art should know that they are not the innovations of the embodiments of the present invention.

[0071] According to another aspect of the present application, an embodiment of the present invention provides a hair dryer including the above-mentioned motor.

[0072] Since the above-mentioned motor is adopted, it at least has the beneficial effects of the motor in the above-mentioned embodiment, and the details will not be repeated; other structures of the hair dryer are not described or limited, which are existing conventional structures. Those skilled in the art should know that they are not the innovation of the embodiments of the present invention.

[0073] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0074] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotor assembly, characterized in that: including a rotating shaft; An impeller is arranged at the upper end of the rotating shaft, a buffer part is sleeved on the upper part of the rotating shaft, bearings are arranged on the upper and lower sides of the buffer part respectively, and a magnetic ring is arranged at the lower part of the rotating shaft; The distance between the upper and lower end faces of the two bearings is greater than or equal to 1 / 3 of the distance from the upper end face of the impeller to the lower end face of the magnetic ring, the distance between the upper and lower end faces of the two bearings is greater than the distance between the upper and lower end faces of the impeller, and the distance between the upper and lower end faces of the two bearings is greater than the distance between the upper and lower end faces of the magnetic ring.

2. A rotor assembly according to claim 1, characterized in that: A bearing chamber is arranged on the outer side of the bearing, and the bearing chamber is integrally processed and formed, and the outer diameter of the bearing chamber is larger than the outer diameter of the magnetic ring.

3. A rotor assembly according to claim 2, characterized in that: The impeller, the bearing chamber and the magnetic ring are all fitted with clearances to each other.

4. A rotor assembly according to claim 1, characterized in that: The outer diameter of the bearing is larger than the outer diameter of the magnetic ring.

5. A motor, characterized in that: Comprising a rotor assembly as described in any one of claims 1-4.

6. A motor according to claim 5, characterized in that: It also includes an air duct, and the rotor assembly is arranged in the inner middle part of the air duct.

7. A motor according to claim 6, characterized in that: There is a gap or transition fit between the bearing chamber and the air duct.

8. The motor according to claim 6, characterized in that: The bearing chamber and the air duct are interference fit with each other.

9. A vacuum cleaner, characterized in that: Comprising the motor as claimed in claims 5-8.

10. A hair dryer, characterized in that: Comprising the motor as claimed in claims 5-8.

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