A parallel bearing rotor system, motor and electrical appliance

Abstract

The present invention discloses a parallel bearing rotor system, a motor and an electrical appliance. The rotor system includes a rotating shaft, and a pair of parallel bearings are arranged on the rotating shaft. The parallel bearings include a rotating shaft bearing and a stator bearing. The rotating shaft bearing is a contact bearing, and the rotating shaft bearing is sleeved on the rotating shaft and is tightly fitted with the rotating shaft. The stator bearing is a non-contact bearing, the stator bearing is sleeved on the rotating shaft bearing, and a gap is left between the inner wall of the stator bearing and the outer wall of the rotating shaft bearing. The stator bearing is fixed on the stator. The motor of the present invention includes the above rotor system. The rotor system of the present invention is applicable to high-speed working conditions, has low lubrication requirements, long service life and high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a parallel bearing rotor system, a motor and an electrical appliance. Background Art

[0002] The bearing used in a motor is a part that supports the shaft. It can guide the rotation of the shaft and can also bear the components idling on the shaft. A motor bearing, also known as an electric motor bearing or a motor bearing, is a special bearing specifically applied to an electric motor or a motor. The motor bearing uses smooth metal balls or rollers and lubricated inner and outer ring metal surfaces to reduce friction. These balls or rollers "carry" the load and support the motor spindle, enabling the motor (rotor) to rotate smoothly.

[0003] However, currently, the bearings of motors have relatively high requirements for the adhesion, working life, and working temperature of grease or lubricating oil. Otherwise, faults such as bearing wear and shaft jamming will occur. And the prices of such grease or lubricating oil are usually relatively high. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a parallel bearing rotor system, a motor and an electrical appliance, which can solve the technical problems of limited motor speed, easy bearing wear and shaft jamming.

[0005] The definition of the parallel bearing involved in the present invention is: including at least two bearings with different diameters, and the bearings are nested in sequence from outside to inside or from inside to outside. When working, the axes of the bearings in the parallel bearing are parallel to each other, and all or part of the bearings are nested with each other.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions.

[0007] A parallel bearing rotor system includes a rotating shaft, and a pair of parallel bearings are arranged on the rotating shaft. The parallel bearings include a rotating shaft bearing and a stator bearing; the rotating shaft bearing is a contact bearing, the rotating shaft bearing is sleeved on the rotating shaft and is tightly fitted with the rotating shaft; the stator bearing is a non-contact bearing, the stator bearing is sleeved on the rotating shaft bearing, and there is a gap between the inner wall of the stator bearing and the outer wall of the rotating shaft bearing, and the stator bearing is fixed on the stator.

[0008] A turbine is sleeved on the rotating shaft of the rotor system.

[0009] At least one thrust disk integrally formed or fixed with the rotating shaft is arranged on the rotating shaft, and a thrust bearing is arranged on the thrust disk.

[0010] The thrust disk and the thrust bearing are arranged on the left side and / or the right side of a pair of parallel bearings.

[0011] The end face of the thrust disk is coated with a polytetrafluoroethylene anti-wear coating.

[0012] The rotating shaft bearing is a ball bearing, and the stator bearing is an air bearing.

[0013] The air bearing is in a ring-shaped cylindrical shape, and at least one annular groove is provided on its outer wall parallel to the end face. A damper is nested in the annular groove. The damper is an annular rubber ring, and the top of the rubber ring protrudes from the outer wall of the air bearing.

[0014] A plurality of bumps are evenly arranged in a circumferential direction along the axial direction on the annular end face of the air bearing. An anti-rotation end cover is provided at one end of the air bearing where the bumps are provided. Anti-rotation holes are provided on the anti-rotation end cover corresponding to the bumps. The bumps are embedded in the anti-rotation holes, and the anti-rotation end cover is fixed to the stator end face by screws.

[0015] A cross-shaped hole is provided on the anti-rotation end cover, including four anti-rotation holes that communicate with each other perpendicularly. The bumps are correspondingly provided in four. Each of the bumps is respectively embedded in each of the anti-rotation holes. A screw hole is provided between two adjacent anti-rotation holes. A screw hole one is provided on the stator end face. After the screw hole and the screw hole one are aligned, they are fastened with screws.

[0016] The rotating shaft bearing is a pair of angular contact ball bearings arranged oppositely. A preload spring is provided between the outer rings of the two angular contact ball bearings. The two ends of the preload spring are respectively fixed to the end portions of the outer rings of the two angular contact ball bearings.

[0017] The parallel bearing further includes at least one intermediate bearing. The intermediate bearing is a contact bearing. The intermediate bearing is sleeved between the rotating shaft bearing and the stator bearing, and a gap is left between the stator bearing and the intermediate bearing.

[0018] The intermediate bearing is a ball bearing.

[0019] A motor is provided with a motor assembly in the middle or on the left or right side of a pair of the parallel bearings. The motor assembly includes a stator magnetic pole and a coil sleeved on the rotating shaft. A magnetic core is provided on the shaft section of the rotating shaft located inside the stator magnetic pole and the coil.

[0020] The outside of the motor is covered with a housing.

[0021] Preferably, the rotating shaft bearing is a ball bearing, a roller bearing, a ceramic bearing or a polytetrafluoroethylene bearing.

[0022] Preferably, the rotating shaft bearing is a single-row, double-row or multi-row ball bearing.

[0023] Preferably, the stator bearing is an air bearing, an oil film floating ring bearing or a tilting pad bearing.

[0024] Preferably, the stator bearing is fixed to the stator by one of key connection, pin connection, dowel pin connection, and bolt connection.

[0025] The present invention also provides an electrical appliance including the motor of the present invention.

[0026] The motor of the present invention can be used in various electrical appliances, including but not limited to washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, blenders, and juicers.

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) The motor of the present invention can be used not only at low speeds but also under high-speed operating conditions, and the motor and the high-speed parallel bearings used are inexpensive.

[0029] (2) The rubber rings of the parallel bearings used in the motor of the present invention are not easily worn, so the service life of the motor is high.

[0030] (3) The speeds of the multiple radial bearings on the motor shaft can be adjusted adaptively without the need for manual setting or adjustment of the speed, and the effect of synchronous rotation can be achieved, so the motor has good stability.

[0031] Of course, it is not necessary for any product implementing the present invention to achieve all of the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a motor of the present invention.

[0033] Figures 2-9 is a schematic layout diagram of the rotor system of the present invention.

[0034] Figure 10 is a schematic diagram of the parallel bearing structure of Embodiment 1 of the rotor system of the present invention.

[0035] Figure 11 is a schematic diagram of the parallel bearing structure of Embodiment 2 of the rotor system of the present invention.

[0036] Figure 12 is a schematic diagram of the parallel bearing structure of Embodiment 3 of the rotor system of the present invention.

[0037] Figure 13 is a schematic diagram of the parallel bearing structure of Embodiment 4 of the rotor system of the present invention.

[0038] Figure 14 is a schematic diagram of the structure in which the parallel bearings of the rotor system of the present invention are arranged at both ends of the shaft.

[0039] Figure 15It is a schematic diagram of a fixing method for the parallel bearings of the rotor system of the present invention.

[0040] Figure 16 It is a side view of the parallel bearing with bumps of the rotor system of the present invention.

[0041] Figure 17 It is a schematic diagram of the structure of the anti-rotation end cover of the rotor system of the present invention.

[0042] Figure 18 It is a side view of the air bearing with bumps of the rotor system of the present invention.

[0043] Reference numerals in the drawings: 1 - shaft bearing, 2 - stator bearing, 21 - rubber ring, 22 - bump, 4 - stator, 41 - first screw hole, 5 - anti-rotation end cover, 51 - anti-rotation hole, 52 - screw hole, 6 - intermediate bearing, 100 - shaft, 101 - magnetic core, 200 - thrust bearing, 210 - thrust disc, 300 - first parallel bearing, 400 - motor assembly, 401 - stator pole and coil, 500 - second parallel bearing, 600 - compressor, 700 - turbine. Detailed implementation manners

[0044] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0045] See Figures 2-9 , a parallel bearing rotor system provided by the present invention includes a shaft 100, and a pair of parallel bearings are arranged on the shaft 100. The parallel bearings include a shaft bearing 1 and a stator bearing 2; the shaft bearing 1 is a contact bearing, and the shaft bearing 1 is sleeved on the shaft 100 and is tightly fitted with the shaft 100; the stator bearing 2 is a non-contact bearing, the stator bearing 2 is sleeved on the shaft bearing 1, a gap is left between the inner wall of the stator bearing 2 and the outer wall of the shaft bearing 1, and the stator bearing 2 is fixed on the stator 4.

[0046] See Figures 3-5 , 7 - 9, at least one thrust disc 210 integrally formed or fixed with the shaft 100 is arranged on the shaft 100, and a thrust bearing 200 is arranged on the thrust disc 210.

[0047] The thrust disc 210 and the thrust bearing 200 are arranged on the left side and / or the right side of a pair of parallel bearings.

[0048] See Figures 6-9 , a turbine 700 is sleeved on the shaft 100 of the rotor system.

[0049] Specifically, the layout manners of the rotor system include, but are not limited to, the following eight kinds:

[0050] 1. Without a turbine:

[0051] (1) Without a thrust bearing: Refer to Figure 2 , a first parallel bearing 300, a motor assembly 400, and a second parallel bearing 500 are successively sleeved on the rotating shaft 100;

[0052] (2) With a thrust bearing at the left end: Refer to Figure 3 , a thrust plate 210 and a thrust bearing 200, a first parallel bearing 300, a motor assembly 400, and a second parallel bearing 500 are successively arranged on the rotating shaft 100;

[0053] (3) With a thrust bearing at the right end: Refer to Figure 4 , a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, a thrust plate 210 and a thrust bearing 200 are successively arranged on the rotating shaft 100;

[0054] (4) With thrust bearings at both the left and right ends: Refer to Figure 5 , a thrust plate 210 and a thrust bearing 200, a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, a thrust plate 210 and a thrust bearing 200 are successively arranged on the rotating shaft 100.

[0055] 2. With a turbine:

[0056] (1) Without a thrust bearing: Refer to Figure 6 , a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, and a turbine 700 are successively sleeved on the rotating shaft 100;

[0057] (2) With a thrust bearing at the left end: Refer to Figure 7 , a thrust plate 210 and a thrust bearing 200, a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, and a turbine 700 are successively arranged on the rotating shaft 100;

[0058] (3) With a thrust bearing at the right end: Refer to Figure 8 , a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, a thrust plate 210 and a thrust bearing 200, and a turbine 700 are successively arranged on the rotating shaft 100;

[0059] (4) With thrust bearings at both the left and right ends: Refer to Figure 9 , a thrust plate 210 and a thrust bearing 200, a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, a thrust plate 210 and a thrust bearing 200, and a turbine 700 are successively arranged on the rotating shaft 100.

[0060] The thrust bearing 200 involved in the above rotor system is a non-contact bearing.

[0061] Further, the thrust bearing 200 is a gas bearing, which may specifically be any one of a hydrodynamic bearing, a hydrostatic bearing, or a hybrid hydrodynamic and hydrostatic bearing.

[0062] The end face of the thrust disk 210 is coated with a polytetrafluoroethylene anti-wear coating.

[0063] See Figure 1 , the present invention also provides a motor, and a motor assembly 400 is disposed in the middle, or on the left or right side of a pair of the parallel bearings; the motor assembly 400 includes a stator magnetic pole and a coil 401 sleeved on the rotating shaft 100, and a magnetic core 101 is disposed on the shaft section of the rotating shaft 100 located inside the stator magnetic pole and the coil 401.

[0064] The outside of the motor is covered with a housing.

[0065] The present invention also provides an electrical appliance, including the motor of the present invention.

[0066] The motor of the present invention can be used in various electrical appliances, including but not limited to washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, blenders, and juicers.

[0067] In specific applications, a pair of parallel bearings are disposed on the rotating shaft 100. See Figure 14 , when the rotating shaft 100 rotates, it drives the inner ring of the rotating shaft bearing 1 to rotate, and the outer ring of the rotating shaft bearing 1 or the outer ring of the outermost intermediate bearing 6 in the middle rotates under the action of an air bearing or an oil film floating ring bearing. Moreover, the rotational speeds of multiple parallel bearings on the same rotating shaft will be adaptively adjusted according to the force to achieve the effect of synchronous rotation.

[0068] First embodiment of the parallel bearing

[0069] The rotating shaft bearing 1 is a ball bearing, and the stator bearing 2 is an air bearing.

[0070] See Figure 10 , in this embodiment, the parallel bearing includes a rotating shaft bearing 1 and a stator bearing 2. The rotating shaft bearing 1 is sleeved on the rotating shaft 100, and the stator bearing 2 is sleeved outside the rotating shaft bearing 1 and maintains a certain gap with the outer wall of the rotating shaft bearing 1.

[0071] The air bearing is in a ring-shaped cylindrical shape, and at least one annular groove is provided on its outer wall parallel to the end face. A damper is nested in the annular groove. The damper is an annular rubber ring 21, and the top of the rubber ring 21 protrudes from the outer wall of the air bearing.

[0072] See Figure 15 、 16, 17, 18, a plurality of bumps 22 are arranged around the annular end face of the air bearing along the axial direction and evenly distributed. An anti-rotation end cover 5 is arranged at one end of the air bearing where the bumps 22 are provided. Anti-rotation holes 51 corresponding to the bumps 22 are arranged on the anti-rotation end cover 5. The bumps 22 are embedded in the anti-rotation holes 51, and the anti-rotation end cover 5 is fixed to the end face of the stator 4 by screws.

[0073] Further, a cross-shaped hole is arranged on the anti-rotation end cover 5, including four anti-rotation holes 51 that are perpendicularly and mutually connected. The bumps 22 are correspondingly arranged as four, and each bump 22 is respectively embedded in each anti-rotation hole 51. Screw holes 52 are arranged between adjacent two anti-rotation holes 51. Screw hole one 41 is arranged on the end face of the stator 4. After the screw holes 52 and the screw hole one 41 are aligned, they are fastened with screws.

[0074] Parallel bearing Embodiment Two

[0075] See Figure 11 , the parallel bearing further includes at least one intermediate bearing 6. The intermediate bearing 6 is a contact bearing. The intermediate bearing 6 is sleeved between the shaft bearing 1 and the stator bearing 2, and a gap is left between the stator bearing 2 and the intermediate bearing 6.

[0076] The intermediate bearing 6 is a ball bearing.

[0077] Specifically, the parallel bearing includes a shaft bearing 1, a stator bearing 2, and an intermediate bearing 6.

[0078] This embodiment is based on Embodiment One. An intermediate bearing 6 (or multiple intermediate bearings 6 are sleeved in sequence and each intermediate bearing 6 is coaxial) is sleeved on the shaft bearing 1. The stator bearing 2 is sleeved outside the outermost intermediate bearing 6 and a certain gap is maintained with the outer wall of the outermost intermediate bearing 6.

[0079] Parallel bearing Embodiment Three

[0080] Further, the ball bearing, roller bearing, ceramic bearing or polytetrafluoroethylene bearing is single-layer, double-layer or multi-layer. The ball bearing or roller bearing of the shaft bearing 1 in Embodiment One and Embodiment Two of the present invention can be an integral multi-layer bearing, and the ball layer or roller layer is arranged in multiple layers. See Figure 12 . The multi-layer ball bearing or roller bearing includes an inner ring, an intermediate ring and an outer ring that are nested with each other. Between the inner ring and the intermediate ring, and between the intermediate ring and the outer ring, balls or rollers are respectively embedded.

[0081] Parallel bearing Embodiment Four

[0082] When the rotating shaft bearing 1 of the present invention is a angular contact ball bearing, since the inner ring of the bearing is fixed on the rotating shaft 100, relative displacement will occur between the outer ring, the cage and the balls. Generally speaking, it means that the balls inside the bearing are too loose and appropriate treatment measures need to be taken.

[0083] See Figure 13 , the rotating shaft bearing 1 is a pair of angular contact ball bearings arranged oppositely, and a preloading spring is arranged between the outer rings of the two angular contact ball bearings; both ends of the preloading spring are respectively fixed at the ends of the outer rings of the two angular contact ball bearings.

[0084] By adjusting the preloading force of the spring, the balls and the cage can be made to approach or separate from each other, that is, the internal friction of the bearing can be increased or decreased, so as to achieve the purpose of the friction force applicable to the required working conditions.

[0085] Further, the surface of the shaft section of the rotating shaft 100 sleeved inside the rotating shaft bearing is coated with a polytetrafluoroethylene anti-wear coating.

[0086] Further, the stator bearing 2 is fixed to the stator 4 by one of key connection, pin connection, dowel pin connection, and bolt connection.

[0087] Further, the rotating shaft bearing 1 is a ball bearing, a roller bearing, a ceramic bearing or a polytetrafluoroethylene bearing.

[0088] Further, the stator bearing 2 is an air bearing, an oil film floating ring bearing or a tilting pad bearing.

[0089] Further, the ball bearing, roller bearing, ceramic bearing or polytetrafluoroethylene bearing can be single-row, double-row or multi-row.

[0090] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A parallel bearing rotor system, comprising a rotating shaft, characterized in that, a pair of parallel bearings are arranged on the rotating shaft, and the parallel bearings include a rotating shaft bearing and a stator bearing; the rotating shaft bearing is a contact bearing, the rotating shaft bearing is sleeved on the rotating shaft and is tightly fitted with the rotating shaft; the stator bearing is a non-contact bearing, the stator bearing is sleeved on the rotating shaft bearing, and a gap is left between the inner wall of the stator bearing and the outer wall of the rotating shaft bearing, and the stator bearing is fixed on the stator; a turbine is sleeved on the rotating shaft of the rotor system; at least one thrust disk integrally formed or fixed with the rotating shaft is arranged on the rotating shaft, and a thrust bearing is arranged on the thrust disk; the thrust disk and the thrust bearing are arranged on the left side or / and the right side of the pair of parallel bearings; a polytetrafluoroethylene anti-wear coating is coated on the end face of the thrust disk; the rotating shaft bearing is a ball bearing, and the stator bearing is an air bearing; the air bearing is in a ring-shaped cylindrical shape, and at least one annular groove is arranged on the outer wall parallel to the end face, a damper is nested in the annular groove, the damper is an annular rubber ring, and the top of the rubber ring protrudes from the outer wall of the air bearing; a plurality of convex blocks are arranged on the annular end face of the air bearing in an axially surrounding and evenly distributed manner, an anti-rotation end cover is arranged at one end of the air bearing where the convex blocks are arranged, anti-rotation holes are correspondingly arranged on the anti-rotation end cover for the convex blocks, the convex blocks are embedded in the anti-rotation holes, and the anti-rotation end cover is fixed on the stator end face by screws; a cross-shaped hole is arranged on the anti-rotation end cover, including four anti-rotation holes that are perpendicularly communicated with each other, the convex blocks are correspondingly arranged in four, each of the convex blocks is respectively embedded in each of the anti-rotation holes, screw holes are arranged between adjacent two of the anti-rotation holes, a screw hole one is arranged on the stator end face, and after the screw hole is aligned with the screw hole one, they are fastened with screws; the rotating shaft bearing is a pair of angular contact ball bearings arranged oppositely, and a preload spring is arranged between the outer rings of the two angular contact ball bearings; both ends of the preload spring are respectively fixed at the ends of the outer rings of the two angular contact ball bearings; the parallel bearings further include at least one intermediate bearing, the intermediate bearing is a contact bearing, the intermediate bearing is sleeved between the rotating shaft bearing and the stator bearing, and a gap is left between the stator bearing and the intermediate bearing; the intermediate bearing is a ball bearing.

2. A motor, comprising a parallel bearing rotor system according to claim 1, characterized in that, a motor assembly is arranged in the middle or on the left side or the right side of the pair of parallel bearings; the motor assembly includes a stator magnetic pole and a coil sleeved on the rotating shaft, and a magnetic core is arranged on the shaft section of the rotating shaft located inside the stator magnetic pole and the coil; a housing is provided outside the motor.

3. An electrical appliance, characterized in that, it includes a motor using parallel bearings according to claim 2.

4. The electrical appliance according to claim 3 is any one of a washing machine, an electric fan, a refrigerator, an air conditioner, a tape recorder, a video recorder, a DVD player, a vacuum cleaner, a camera, a hair dryer, an electric shaver, a blender, a juicer, and a soybean milk machine.

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