CN111022491A

CN111022491A - Parallel bearing rotor system, motor and electric appliance

Info

Publication number: CN111022491A
Application number: CN201911340055.6A
Authority: CN
Inventors: 靳普; 刘慕华
Original assignee: Zhiyue Tengfeng Technology Group Co Ltd
Current assignee: Liu Muhua
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-04-17
Also published as: WO2021129428A1

Abstract

The invention discloses a parallel bearing rotor system, a motor and an electric appliance, wherein the rotor system comprises a rotating shaft, a pair of parallel bearings is arranged on the rotating shaft, and each parallel bearing comprises a rotating shaft bearing and a stator bearing; the rotating shaft bearing is a contact bearing, and is sleeved on the rotating shaft and tightly matched with the rotating shaft; the stator bearing is a non-contact bearing, the stator bearing is sleeved on the rotating shaft bearing, a gap is reserved 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. The motor comprises the rotor system. The rotor system is suitable for high-rotating-speed working conditions, and has low requirement on lubrication, long service life and high reliability.

Description

Parallel bearing rotor system, motor and electric appliance

Technical Field

The invention relates to the technical field of motors, in particular to a parallel bearing rotor system, a motor and an electric appliance.

Background

The bearing used in the motor is a part for supporting the shaft, and can guide the rotation of the shaft and bear the idle part on the shaft. The motor bearing is also named as a motor bearing or a motor bearing, and is a special bearing specially applied to a motor or a motor. Motor bearings utilize smooth metal balls or rollers and lubricated inner and outer race metal surfaces to reduce friction. These balls or rollers "carry" the load and support the motor shaft so that the motor (rotor) can rotate smoothly.

However, the current motor bearings have high requirements on the adhesion of grease or lubricating oil, the service life and the working temperature, otherwise, the bearing wear, shaft clamping and other faults can be caused. The price of such greases or oils is also generally high.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a parallel bearing rotor system, a motor and an electric appliance, which can solve the technical problems of limited motor rotation speed, easy abrasion of a bearing and shaft clamping.

The definition of the parallel bearing to which the invention relates is: the parallel bearing comprises at least two bearings with different diameters, wherein the bearings are sequentially nested from outside to inside or from inside to outside, the axes of the bearings in the parallel bearing are parallel to each other when the parallel bearing works, and the bearings are completely or partially nested.

In order to achieve the above object, the present invention adopts the following technical solutions.

A parallel bearing rotor system comprises a rotating shaft, wherein a pair of parallel bearings is arranged on the rotating shaft, and each parallel bearing comprises a rotating shaft bearing and a stator bearing; the rotating shaft bearing is a contact bearing, and is sleeved on the rotating shaft and tightly matched with the rotating shaft; the stator bearing is a non-contact bearing, the stator bearing is sleeved on the rotating shaft bearing, a gap is reserved 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.

And a rotating shaft of the rotor system is sleeved with a turbine.

The rotating shaft is provided with at least one thrust disc which is integrally formed with or fixed into a whole with the rotating shaft, and the thrust disc is provided with a thrust bearing.

The thrust disc and the thrust bearing are arranged on the left side or/and the right side of the pair of parallel bearings.

And the end face of the thrust disc is coated with a tetrafluoroethylene anti-wear coating.

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

The air bearing is in an annular cylinder shape, at least one annular groove is formed in the outer wall of the air bearing in parallel to the end face, a damper is nested in the annular groove and is an annular rubber ring, and the top of the rubber ring protrudes out of the outer wall of the air bearing.

The air bearing is characterized in that a plurality of lugs are axially and uniformly arranged on the annular end face of the air bearing, one end of each lug arranged on the air bearing is provided with an anti-rotation end cover, the anti-rotation end cover corresponds to the lug which is provided with an anti-rotation hole, and the lug is embedded into the anti-rotation hole and is fixed on the end face of the stator through screws.

Prevent rotating and set up the cross hole on the end cover, including four anti-rotation holes of mutually perpendicular intercommunication, the lug correspondence sets up to four, each the lug imbeds respectively that each prevents rotating downtheholely, adjacent two prevent setting up the screw hole between the rotation hole, the stator terminal surface sets up screw hole one, screw hole and screw hole align with the back with screw fastening.

The rotating shaft bearing is a pair of angular contact ball bearings which are oppositely arranged, and a preload spring is arranged between the outer rings of the two angular contact ball bearings; and two ends of the preloading spring are respectively fixed at the end parts of the outer rings of the two angular contact ball bearings.

The parallel bearing further comprises at least one middle bearing, the middle bearing is a contact bearing, the middle bearing is sleeved between the rotating shaft bearing and the stator bearing, and a gap is reserved between the stator bearing and the middle bearing.

The intermediate bearing is a ball bearing.

A motor, a motor component is arranged in the middle or on the left side or the right side of a pair of parallel bearings; the motor assembly comprises a stator magnetic pole and a coil which are sleeved on the rotating shaft, and a magnetic core is arranged at a shaft section of the rotating shaft, which is positioned in the stator magnetic pole and the coil.

The motor is covered with a shell.

Preferably, the rotating shaft bearing is a ball bearing, a roller bearing, a ceramic bearing or a tetrafluoroethylene bearing.

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

Preferably, the stator bearing is an air bearing, an oil film floating ring bearing or a tilt-pad bearing.

Preferably, the stator bearing is fixed on the stator by one of key connection, pin connection and bolt connection.

The invention also provides an electric appliance comprising the motor.

The motor of the present invention may be used in various kinds of electric appliance, including but not limited to washing machine, electric fan, refrigerator, air conditioner, recorder, video disc player, dust collector, camera, electric hair drier, electric shaver, stirrer and juicer.

The invention has the beneficial effects that:

(1) the motor of the invention can be used for low rotating speed and high rotating speed working condition, and the motor and the high-speed parallel bearing have low cost.

(2) The parallel bearing rubber ring used by the motor is not easy to wear, so that the service life of the motor is long.

(3) The rotating speeds of the radial bearings on the motor rotating shaft can be adjusted in a self-adaptive mode, the rotating speed does not need to be set or adjusted manually, the effect of synchronous rotation can be achieved, and therefore the motor is good in stability.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

Fig. 1 is a schematic structural view of a motor according to the present invention.

Fig. 2-9 are schematic views of the layout of the rotor system of the present invention.

Fig. 10 is a schematic view of a parallel bearing structure of a first embodiment of a rotor system according to the present invention.

Fig. 11 is a schematic view of a parallel bearing structure of a second embodiment of the rotor system of the present invention.

Fig. 12 is a schematic view of a parallel bearing structure of a third embodiment of the rotor system of the present invention.

Fig. 13 is a schematic view of a parallel bearing structure of a fourth embodiment of the rotor system of the present invention.

Fig. 14 is a schematic view of the structure of the rotor system of the present invention with parallel bearings disposed at both ends of the shaft.

Fig. 15 is a schematic view of a fixing manner of the parallel bearing of the rotor system of the present invention.

Fig. 16 is a side view of a parallel bearing with lugs for a rotor system of the present invention.

FIG. 17 is a schematic structural view of an anti-rotation end cap of the rotor system of the present invention.

FIG. 18 is a side view of an air bearing with tabs for a rotor system of the present invention.

The reference numbers: 1-rotating shaft bearing, 2-stator bearing, 21-rubber ring, 22-lug, 4-stator, 41-screw hole I, 5-anti-rotation end cover, 51-anti-rotation hole, 52-screw hole, 6-middle bearing, 100-rotating shaft, 101-magnetic core, 200-thrust bearing, 210-thrust disc, 300-first parallel bearing, 400-motor component, 401-stator magnetic pole and coil, 500-second parallel bearing, 600-compressor and 700-turbine.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

Referring to fig. 2-9, the parallel bearing rotor system provided by the present invention includes a rotating shaft 100, a pair of parallel bearings is disposed on the rotating shaft 100, and the parallel bearings include a rotating shaft bearing 1 and a stator bearing 2; the rotating shaft bearing 1 is a contact bearing, and the rotating shaft bearing 1 is sleeved on the rotating shaft 100 and is tightly matched with the rotating shaft 100; the stator bearing 2 is a non-contact bearing, the stator bearing 2 is sleeved on the rotating shaft bearing 1, a gap is reserved between the inner wall of the stator bearing 2 and the outer wall of the rotating shaft bearing 1, and the stator bearing 2 is fixed on the stator 4.

Referring to fig. 3-5 and 7-9, at least one thrust disc 210 integrally formed or fixed with the rotating shaft 100 is disposed on the rotating shaft 100, and a thrust bearing 200 is disposed on the thrust disc 210.

The thrust disk 210 and the thrust bearing 200 are disposed on the left side or/and the right side of a pair of parallel bearings.

Referring to fig. 6 to 9, a turbine 700 is sleeved on the rotating shaft 100 of the rotor system.

Specifically, the arrangement of the rotor system includes, but is not limited to, the following eight types:

1. no turbine is arranged:

(1) no thrust bearing: referring to fig. 2, the first parallel bearing 300, the motor assembly 400, and the second parallel bearing 500 are sequentially sleeved on the rotating shaft 100;

(2) the left end is provided with a thrust bearing: referring to fig. 3, a thrust disc 210, a thrust bearing 200, a first parallel bearing 300, a motor assembly 400, and a second parallel bearing 500 are sequentially disposed on a rotating shaft 100;

(3) the right end is provided with a thrust bearing: referring to fig. 4, the rotating shaft 100 is provided with a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, a thrust disc 210 and a thrust bearing 200 in sequence;

(4) the left end and the right end are both provided with thrust bearings: referring to fig. 5, the thrust disc 210, the thrust bearing 200, the first parallel bearing 300, the motor assembly 400, the second parallel bearing 500, the thrust disc 210, and the thrust bearing 200 are sequentially disposed on the rotating shaft 100.

2. Setting a turbine:

(1) no thrust bearing: referring to fig. 6, the first parallel bearing 300, the motor assembly 400, the second parallel bearing 500, and the turbine 700 are sequentially sleeved on the rotating shaft 100;

(2) the left end is provided with a thrust bearing: referring to fig. 7, the thrust disc 210, the thrust bearing 200, the first parallel bearing 300, the motor assembly 400, the second parallel bearing 500, and the turbine 700 are sequentially disposed on the rotating shaft 100;

(3) the right end is provided with a thrust bearing: referring to fig. 8, a first parallel bearing 300, a motor assembly 400, a second parallel bearing 500, a thrust disc 210, a thrust bearing 200 and a turbine 700 are sequentially arranged on a rotating shaft 100;

(4) the left end and the right end are both provided with thrust bearings: referring to fig. 9, the thrust disk 210, the thrust bearing 200, the first parallel bearing 300, the motor assembly 400, the second parallel bearing 500, the thrust disk 210, the thrust bearing 200, and the turbine 700 are sequentially disposed on the rotating shaft 100.

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

Further, the thrust bearing 200 is a gas bearing, and may be specifically any one of a dynamic pressure bearing, a static pressure bearing, or a hybrid dynamic and static pressure bearing.

The end face of the thrust disc 210 is coated with a tetrafluoroethylene wear-resistant coating.

Referring to fig. 1, the present invention further provides a motor, wherein a motor set 400 is disposed in the middle or on the left side or the right side of a pair of parallel bearings; the motor assembly 400 includes a stator pole and a coil 401 sleeved on the rotating shaft 100, and a magnetic core 101 is disposed at a shaft section of the rotating shaft 100 located in the stator pole and the coil 401.

The motor is covered with a shell.

The invention also provides an electric appliance comprising the motor.

In a specific application, the rotating shaft 100 is provided with a pair of parallel bearings, referring to fig. 14, when the rotating shaft 100 rotates, the inner ring of the rotating shaft bearing 1 is driven to rotate, and the outer ring of the rotating shaft bearing 1 or the outer ring of the outermost intermediate bearing 6 rotates under the action of an air bearing or an oil film floating ring bearing. And the rotating speeds of a plurality of parallel bearings on the same rotating shaft can be adaptively adjusted according to stress, so that the effect of synchronous rotation is achieved.

Parallel bearing embodiment one

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

Referring to fig. 10, the parallel bearing in this embodiment includes a 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 keeps a certain gap with the outer wall of the rotating shaft bearing 1.

The air bearing is in an annular cylinder shape, at least one annular groove is formed in the outer wall of the air bearing in parallel to the end face, a damper is nested in the annular groove and is an annular rubber ring 21, and the top of the rubber ring 21 protrudes out of the outer wall of the air bearing.

Referring to fig. 15, 16, 17, and 18, a plurality of protrusions 22 are axially and uniformly arranged on an annular end surface of the air bearing, an anti-rotation end cover 5 is arranged at one end of the air bearing where the protrusion 22 is arranged, an anti-rotation hole 51 is arranged on the anti-rotation end cover 5 corresponding to the protrusion 22, the protrusion 22 is embedded into the anti-rotation hole 51, and the anti-rotation end cover 5 is fixed on an end surface of the stator 4 through a screw.

Further, set up the cross hole on the anti-rotation end cover 5, including four anti-rotation holes 51 of mutually perpendicular intercommunication, lug 22 corresponds to set up to four, and in each lug 22 imbed each anti-rotation hole 51 respectively, set up screw hole 52 between two adjacent anti-rotation holes 51, the stator 4 terminal surface sets up screw hole one 41, and screw hole 52 aligns with screw hole one 41 with the screw fastening.

Embodiment two of parallel bearing

Referring to fig. 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 rotating shaft bearing 1 and the stator bearing 2, and a gap is left between the stator bearing 2 and the intermediate bearing 6.

The intermediate bearing 6 is a ball bearing.

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

In the present embodiment, on the basis of the first embodiment, one intermediate bearing 6 is sleeved on the rotating shaft bearing 1 (or a plurality of intermediate bearings 6 are sequentially sleeved outside and each intermediate bearing 6 is coaxial), and the stator bearing 2 is sleeved outside the outermost intermediate bearing 6 and keeps a certain gap with the outer wall of the outermost intermediate bearing 6.

Parallel bearing embodiment three

Further, the ball bearing, the roller bearing, the ceramic bearing or the tetrafluoroethylene bearing is a single layer, a double layer or a multilayer. The ball bearing or the roller bearing of the shaft bearing 1 according to the first and second embodiments of the present invention may be an integral multi-layer bearing, and the ball layer or the roller layer may be provided in multiple layers, as shown in fig. 12. The multilayer ball bearing or roller bearing comprises an inner ring, an intermediate ring and an outer ring which are nested with each other, wherein balls or rollers are respectively embedded between the inner ring and the intermediate ring and between the intermediate ring and the outer ring.

Parallel bearing embodiment four

When the rotating shaft bearing 1 of the present invention is an angular contact ball bearing, since the inner ring of the bearing is fixed on the rotating shaft 100, relative displacement occurs between the outer ring, the retainer and the balls, which is commonly referred to as that the balls in the bearing are too loose, and appropriate treatment measures are required.

Referring to fig. 13, the rotating shaft bearing 1 is a pair of angular contact ball bearings which are arranged oppositely, and a preload spring is arranged between outer rings of the two angular contact ball bearings; and two ends of the preloading spring are respectively fixed at the end parts of the outer rings of the two angular contact ball bearings.

The preload force of the spring is adjusted to enable the balls and the retainer to be close to or far away from each other, namely the friction force in the bearing can be increased or reduced, so that the purpose of being suitable for the friction force under the required working condition is achieved.

Further, the surface of the shaft section of the rotating shaft 100 sleeved in the rotating shaft bearing is coated with a tetrafluoroethylene anti-wear coating.

Further, the stator bearing 2 is fixed on the stator 4 by one of key connection, pin connection and bolt connection.

Further, the rotating shaft bearing 1 is a ball bearing, a roller bearing, a ceramic bearing or a tetrafluoroethylene bearing.

Further, the stator bearing 2 is an air bearing, an oil film floating ring bearing or a tilt pad bearing.

Further, the ball bearing, the roller bearing, the ceramic bearing or the tetrafluoroethylene bearing may be single-row, double-row or multi-row.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims

1. A parallel bearing rotor system comprises a rotating shaft and is characterized in that a pair of parallel bearings are arranged on the rotating shaft, and each parallel bearing comprises a rotating shaft bearing and a stator bearing; the rotating shaft bearing is a contact bearing, and is sleeved on the rotating shaft and tightly matched with the rotating shaft; the stator bearing is a non-contact bearing, the stator bearing is sleeved on the rotating shaft bearing, a gap is reserved 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.

2. A parallel bearing rotor system as claimed in claim 1 wherein the rotor system has a shaft on which a turbine is mounted.

3. A parallel bearing rotor system according to claim 1, wherein said shaft is provided with at least one thrust disk formed integrally with or fixed to said shaft, said thrust disk being provided with a thrust bearing.

4. A parallel bearing rotor system according to claim 3, wherein the thrust disk and thrust bearing are disposed to the left or/and right of a pair of parallel bearings.

5. A parallel bearing rotor system according to claim 3 wherein the thrust disc end face is coated with a tetrafluoroethylene anti-wear coating.

6. A parallel bearing rotor system according to claim 1, wherein said shaft bearings are ball bearings and said stator bearings are air bearings.

7. The parallel bearing rotor system of claim 6, wherein said air bearing is in the shape of an annular cylinder, the outer wall of said air bearing is provided with at least one annular groove parallel to the end face, the damper is nested in said annular groove, said damper is an annular rubber ring, and the top of said rubber ring protrudes from the outer wall of said air bearing.

8. The parallel bearing rotor system according to claim 7, wherein a plurality of protrusions are axially and uniformly arranged on the annular end surface of the air bearing, an anti-rotation end cover is arranged at one end of the air bearing where the protrusions are arranged, anti-rotation holes are arranged on the anti-rotation end cover corresponding to the protrusions, the protrusions are embedded into the anti-rotation holes, and the anti-rotation end cover is fixed on the end surface of the stator through screws.

9. The parallel bearing rotor system according to claim 8, wherein the rotation preventing end cap is provided with a cross-shaped hole comprising four rotation preventing holes vertically communicated with each other, the number of the protrusions is four, each protrusion is embedded into each rotation preventing hole, a screw hole is arranged between two adjacent rotation preventing holes, the end surface of the stator is provided with a first screw hole, and the screw holes are aligned with the first screw holes and then fastened by screws.

10. The parallel bearing rotor system of claim 1, wherein the shaft bearing is a pair of angular contact ball bearings disposed opposite to each other, and a preload spring is disposed between outer races of the two angular contact ball bearings; and two ends of the preloading spring are respectively fixed at the end parts of the outer rings of the two angular contact ball bearings.

11. The parallel bearing rotor system of claim 1, wherein the parallel bearing further comprises 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.

12. A parallel bearing rotor system according to claim 11, wherein said intermediate bearing is a ball bearing.

13. An electric machine comprising a parallel bearing rotor system according to any of claims 1-12, wherein a motor assembly is provided in the middle or left or right of a pair of said parallel bearings; the motor assembly comprises a stator magnetic pole and a coil which are sleeved on the rotating shaft, and a magnetic core is arranged at a shaft section of the rotating shaft, which is positioned in the stator magnetic pole and the coil.

14. An electrical machine as claimed in claim 13, wherein the exterior of the machine is covered by a housing.

15. An electrical appliance comprising an electrical machine using parallel bearings as claimed in claim 13 or 14.

16. An electrical appliance as claimed in claim 15 which is any one of a washing machine, an electric fan, a refrigerator, an air conditioner, a recorder, a video disc player, a vacuum cleaner, a camera, an electric hair dryer, an electric shaver, a blender, a juicer, a soymilk maker.