Motor

Abstract

The utility model discloses a motor, which comprises a rotating shaft, a stator assembly, a rotor assembly, a casing, an upper end cover and a lower end cover, the stator assembly is sleeved outside the rotor assembly, the rotating shaft is arranged on the rotor assembly, the upper end cover and the lower end cover are respectively arranged at two ends of the casing to form a cavity, and the stator assembly and the rotor assembly are arranged in the cavity. An upper bearing chamber and a lower bearing chamber are arranged in the middle of the upper end cover and the middle of the lower end cover respectively, bearings are installed in the upper bearing chamber and the lower bearing chamber respectively, a shaft extension hole is formed in the middle of the upper end cover, the upper bearing chamber is communicated with the shaft extension hole, and the rotating shaft is supported and installed on the bearings at the two ends. The lower end cover is provided with a containing cavity used for storing conductive grease, the containing cavity is communicated with the lower bearing chamber, an oil seal is installed between the containing cavity and the lower bearing chamber, a through hole is formed in the middle of the oil seal, and the other end of the rotating shaft stretches into the containing cavity from the through hole to make contact with the conductive grease. The structural arrangement is reasonable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a motor. BACKGROUND

[0002] In recent years, the complaints of bearing electric corrosion are more and more in the market, and seriously limit the service life of the motor. In order to reduce customer complaints, and in order to avoid bearing electric corrosion in the design stage, meet the design theory service life of motor and air conditioner, more and more solutions of bearing corrosion problem of shaft current appear in the market.

[0003] The occurrence of bearing electric corrosion problem is because the shaft current passes through the discharge contact of bearing ball and raceway to form corrosion, so there are two common solutions: the first solution is to insulate the bearing to cut off the conduction of shaft current. The second solution is to let the shaft current conduct by bypass, so that the current does not pass through the bearing, which can solve the electric corrosion problem. For example: carbon brush scheme, there is carbon brush wear problem, ceramic bearing scheme, there is high cost problem. SUMMARY

[0004] The utility model discloses a kind of motors that can reduce manufacturing cost and solve bearing electric corrosion.

[0005] The technical scheme of the utility model is as follows:

[0006] The utility model provides a kind of motor, including shaft, stator assembly, rotor assembly, shell, upper end cover and lower end cover, stator assembly is sleeved in rotor assembly outer, shaft installs rotor assembly, upper end cover and lower end cover are respectively installed in the two ends of shell and form cavity, stator assembly and rotor assembly are installed in cavity, upper end cover and lower end cover are respectively equipped with upper bearing chamber and lower bearing chamber in middle, bearing is installed in upper bearing chamber and lower bearing chamber, the middle of upper end cover is equipped with shaft extension hole, upper bearing chamber is communicated with shaft extension hole, shaft is supported and installed on the bearing of two ends, the end of shaft extends from shaft extension hole, it is characterized in that:

[0007] Lower end cover is metal end cover, and the lower end cover is provided with a containing cavity for storing conductive grease, the containing cavity is communicated with the lower bearing chamber, wherein an oil seal is installed between the containing cavity and the lower bearing chamber, the oil seal is provided with a through hole in the middle, the other end of the shaft extends into the containing cavity and contacts the conductive grease from the through hole.

[0008] The surface of the other end of the shaft is provided with an annular positioning groove, and the oil seal is provided with an annular positioning angle, which is clamped in the annular positioning groove.

[0009] The outer surface of the oil seal is tightly attached to the cavity wall of the containing cavity, and the inner surface of the oil seal is tightly attached to the outer surface of the shaft.

[0010] The inner surface of the oil seal is provided with a flange.

[0011] The upper end cover is provided with a plurality of mounting holes, and the lower end cover is provided with a plurality of threaded holes.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. A motor, comprising a rotating shaft, a stator assembly, a rotor assembly, a casing, an upper end cover and a lower end cover, the stator assembly is sleeved outside the rotor assembly, the rotating shaft is installed on the rotor assembly, the upper end cover and the lower end cover are installed at two ends of the casing to form a cavity, the stator assembly and the rotor assembly are installed in the cavity, upper bearing chambers and lower bearing chambers are respectively arranged in the middle of the upper end cover and the lower end cover, bearings are installed in the upper bearing chambers and the lower bearing chambers, a shaft extension hole is arranged in the middle of the upper end cover, the upper bearing chambers are communicated with the shaft extension hole, the rotating shaft is supported and installed on the bearings at two ends, one end of the rotating shaft extends out of the shaft extension hole, a containing cavity for storing conductive grease is arranged on the lower end cover, the containing cavity is communicated with the lower bearing chamber, an oil seal is installed between the containing cavity and the lower bearing chamber, a through hole is arranged in the middle of the oil seal, the other end of the rotating shaft extends into the containing cavity through the through hole and contacts the conductive grease, the structure can reduce manufacturing cost, solve bearing electric corrosion and is reasonable in structure arrangement.

[0014] 2. Other advantages of the utility model are described in detail in the embodiment part of the specification. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A perspective view of the utility model is provided;

[0016] Figure 2 A front view of the utility model is provided;

[0017] Figure 3 A Figure 2 A-A sectional view of the utility model is provided;

[0018] Figure 4 A Figure 3 A local enlarged view of B of the utility model is provided. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] Embodiment one:

[0021] As Figures 1 to 4 shown, the embodiment provides a motor, comprising a rotating shaft 1, a stator assembly 2, a rotor assembly 3, a casing 4, an upper end cover 5 and a lower end cover 6, the stator assembly 2 is sleeved outside the rotor assembly 3, the rotating shaft 1 is installed on the rotor assembly 3, the upper end cover 5 and the lower end cover 6 are respectively installed at both ends of the casing 4 to form a cavity 10, the stator assembly 2 and the rotor assembly 3 are installed in the cavity 10, the upper end cover 5 and the lower end cover 6 are respectively provided with an upper bearing chamber 51 and a lower bearing chamber 61 in the middle, bearings 100 are installed in the upper bearing chamber 51 and the lower bearing chamber 61, the middle of the upper end cover 5 is provided with a shaft extension hole 52, the upper bearing chamber 51 is communicated with the shaft extension hole 52, the rotating shaft 1 is supported and installed on the bearings 100 at both ends, one end of the rotating shaft 1 extends out of the shaft extension hole 52, and the motor is characterized in that:

[0022] The lower end cover 6 is a metal end cover, the lower end cover 6 is provided with a containing cavity 62 for storing conductive grease, the containing cavity 62 is communicated with the lower bearing chamber 61, an oil seal 7 is installed between the containing cavity 62 and the lower bearing chamber 61, a through hole 71 is formed in the middle of the oil seal 7, the other end of the rotating shaft 1 extends into the containing cavity 62 and contacts the conductive grease from the through hole 71, the structure can not only reduce the manufacturing cost, but also solve the bearing electric corrosion, and the structure arrangement is reasonable.

[0023] Working principle: when the motor appears shaft voltage, the electric charge is gathered on the shaft, the other end of the rotating shaft contacts the conductive grease, the conductive grease contacts the metal end cover, thereby forming conduction, avoiding the output shaft voltage, and improving the bearing electric corrosion problem.

[0024] The surface of the other end of the rotating shaft 1 is provided with an annular positioning groove 11, the oil seal 7 is provided with an annular positioning angle 70, the annular positioning angle 70 is clamped in the annular positioning groove 11, the positioning effect is good, and the structure arrangement is reasonable.

[0025] The outer surface of the oil seal 7 is tightly attached to the cavity wall of the containing cavity 62, and the inner surface of the oil seal 7 is tightly attached to the outer surface of the rotating shaft 1, so that the conductive grease is effectively prevented from seeping out.

[0026] The inner surface of the oil seal 7 is protruded with a flange 72, the sealing effect between the oil seal and the rotating shaft is improved, and the conductive grease is effectively prevented from seeping out.

[0027] The upper end cover 5 is provided with a plurality of mounting holes 53, the lower end cover 6 is provided with a plurality of threaded holes 63, the mounting holes 53 and the threaded holes 63 are corresponding, a screw 200 is passed through the mounting hole 53 of the upper end cover 5 and the threaded hole 63 of the lower end cover 6 to be locked, so that the upper end cover 5 and the lower end cover 6 are locked at both ends of the casing 4.

[0028] The above embodiment is a preferred embodiment of the present application, but the embodiment of the present application is not limited thereto, and any change, modification, replacement, combination, simplification, etc. made without departing from the spirit and principle of the present application is an equivalent replacement mode, and all of them are included in the protection scope of the present application.

Claims

1. An electric machine comprising a rotating shaft (1), a stator assembly (2), a rotor assembly (3), a machine shell (4), an upper end cover (5) and a lower end cover (6), the stator assembly (2) being sleeved outside the rotor assembly (3), the rotating shaft (1) being installed on the rotor assembly (3), the upper end cover (5) and the lower end cover (6) being installed at two ends of the machine shell (4) to form a cavity (10), the stator assembly (2) and the rotor assembly (3) being installed in the cavity (10), an upper bearing chamber (51) and a lower bearing chamber (61) being respectively arranged in the middle of the upper end cover (5) and the lower end cover (6), bearings (100) being installed in the upper bearing chamber (51) and the lower bearing chamber (61), a shaft extension hole (52) being arranged in the middle of the upper end cover (5) and communicating with the upper bearing chamber (51), the rotating shaft (1) being supported and installed on the bearings (100) at two ends, one end of the rotating shaft (1) extending out of the shaft extension hole (52), characterized in that: the lower end cover (6) is a metal end cover, a containing cavity (62) for storing conductive grease is arranged on the lower end cover (6), the containing cavity (62) communicates with the lower bearing chamber (61), an oil seal (7) is installed between the containing cavity (62) and the lower bearing chamber (61), a through hole (71) is arranged in the middle of the oil seal (7), the other end of the rotating shaft (1) extends into the containing cavity (62) to contact the conductive grease through the through hole (71).

2. An electric machine as claimed in claim 1, characterized in that: An annular positioning groove (11) is arranged on the surface of the other end of the rotating shaft (1), an annular positioning corner (70) is arranged on the oil seal (7), and the annular positioning corner (70) is clamped in the annular positioning groove (11).

3. An electrical machine according to claim 1 or 2, characterised in that: The outer surface of the oil seal (7) is tightly attached to the cavity wall of the containing cavity (62), and the inner surface of the oil seal (7) is tightly attached to the outer surface of the rotating shaft (1).

4. An electric machine as claimed in claim 3, characterised in that: A flange (72) is protruded on the inner surface of the oil seal (7).

5. An electric machine according to claim 4, characterized in that: A plurality of mounting holes (53) are arranged on the upper end cover (5), a plurality of threaded holes (63) are arranged on the lower end cover (6), the mounting holes (53) correspond to the threaded holes (63), and screws (200) pass through the mounting holes (53) of the upper end cover (5) and are locked with the threaded holes (63) of the lower end cover (6) to lock the upper end cover (5) and the lower end cover (6) at two ends of the machine shell (4).

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