Magnetic levitation bearing structure and magnetic levitation compressor structure

Abstract

Magnetic levitation bearing structure includes a cylinder body, a rotating shaft, a motor stator, a motor rotor, an axial bearing, a radial bearing and a displacement sensing device; the displacement sensing device, the axial bearing stator, and the radial bearing stator are directly fixed on an inner wall of the cylinder body.

Claims

1. A magnetic levitation bearing structure, comprising a cylinder body, a rotating shaft, a motor stator, a motor rotor, an axial bearing, a radial bearing and a displacement sensing device; the axial bearing comprising an axial bearing stator and an axial bearing rotor, the radial bearing comprising a radial bearing stator and a radial bearing rotor; the motor rotor, the axial bearing rotor, and the radial bearing rotor sleeving the rotating shaft, the motor stator sleeving in the cylinder body; wherein the displacement sensing device, the axial bearing stator, and the radial bearing stator are directly fixed on an inner wall of the cylinder body; wherein the displacement sensing device comprises a rear displacement sensor assembly and a front displacement sensor assembly; wherein the radial bearing stator comprises a magnetic levitation rear radial bearing stator and a magnetic levitation front radial bearing stator, wherein the rear displacement sensor assembly and the front displacement sensor assembly are fixedly arranged in the cylinder body, the rear displacement sensor assembly is located on a side of the magnetic levitation rear radial bearing stator away from the magnetic levitation front radial bearing stator, and the front displacement sensor assembly is located on a side of the magnetic levitation front radial bearing stator away from the magnetic levitation rear radial bearing stator; wherein a rear secondary protection and a rear displacement sensor are provided at an inner diameter of the rear displacement sensor assembly; and a front secondary protection and a front displacement sensor are provided at an inner diameter of the front displacement sensor assembly.

2. The magnetic levitation bearing structure according to claim 1, wherein the axial bearing stator is a magnetic levitation rear axial bearing and a magnetic levitation front axial bearing, and the axial bearing rotor is a thrust bearing.

3. The magnetic levitation bearing structure according to claim 2, wherein the thrust bearing is located between the magnetic levitation rear axial bearing and the magnetic levitation front axial bearing.

4. The magnetic levitation bearing structure according to claim 1, wherein the radial bearing rotor comprises a magnetic levitation rear radial bearing rotor and a magnetic levitation front radial bearing rotor.

5. The magnetic levitation bearing structure according to claim 4, wherein the magnetic levitation rear radial bearing stator and the magnetic levitation front radial bearing stator are fixedly arranged in the cylinder body, and are located on both sides of the motor stator.

6. The magnetic levitation bearing structure according to claim 5, wherein the magnetic levitation rear radial bearing stator is provided with a magnetic levitation rear radial bearing stator winding, and the magnetic levitation front radial bearing stator is provided with a magnetic levitation front radial bearing stator winding.

7. The magnetic levitation bearing structure according to claim 4, wherein the magnetic levitation rear radial bearing rotor and the magnetic levitation front radial bearing rotor sleeve the rotating shaft and are located on both sides of the motor rotor.

8. The magnetic levitation bearing structure according to claim 1, wherein a rear ball bearing is provided at the inner diameter of the rear displacement sensor assembly, and a front ball bearing is provided at the inner diameter of the front displacement sensor assembly.

9. The magnetic levitation bearing structure according to claim 8, wherein a rear ball bearing baffle is provided on an outer side of the rear ball bearing, and a front ball bearing baffle is provided on an outer side of the front ball bearing.

10. A magnetic levitation compressor structure, comprising the magnetic levitation bearing structure according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In order to more clearly describe the technical solution in the embodiment of the present disclosure or the related art, the accompanying drawing required for describing the embodiment or the related art is briefly introduced. Obviously, the drawing in the following description is only the embodiment of the present disclosure. Those of ordinary skill in the art can obtain other drawings based on the disclosed drawing without creative work.

(2) FIG. 1 is a schematic diagram illustrating a magnetic levitation stator core.

DETAILED DESCRIPTION

(3) In order to make the purpose, technical solution, and advantages of the present disclosure clearer, the technical solution of the present disclosure will be described clearly and completely in conjunction with specific embodiments and the corresponding drawings in the present disclosure. Obviously, the described embodiments are merely some embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

(4) In some embodiments of the present disclosure, a magnetic levitation compressor structure adopting a new type of magnetic levitation bearing structure is provided, as shown in FIG. 1, which includes a magnetic levitation rear axial bearing 1, a thrust bearing 2, a magnetic levitation front axial bearing 3, a rear ball bearing baffle 4, a rear displacement sensor assembly 5, a rear secondary protection 51, a rear displacement sensor 52, a rear ball bearing 6, a magnetic levitation rear radial bearing stator winding 7, a magnetic levitation rear radial bearing stator 8, a magnetic levitation rear radial bearing rotor 9, a motor stator winding 10, a motor stator 11, a motor rotor 12, a cylinder body 13, a magnetic levitation front radial bearing stator winding 14, a magnetic levitation front radial bearing stator 15, a magnetic levitation front radial bearing rotor 16, a front displacement sensor assembly 17, a front secondary protection 171, a front displacement sensor 172, a front ball bearing baffle 18, a front ball bearing 19, a pneumatic component 20, a box body 21, a rotating shaft 22. The displacement sensor and the secondary protection are formed in one piece to act as a support position of the ball bearing.

(5) When assembling, the ball bearing 19/6 is first installed into the displacement sensor assembly (a displacement sensor probe is installed next to the secondary protection to integrate the displacement sensor and the secondary protection together), and the ball bearing cover plate is locked on the sensor assembly with screws.

(6) Then the cylinder body 13 is heated, and the shrink-fit is performed on the motor stator 11. The magnitude of interference between the motor stator 11 and the cylinder body 13 is designed to be larger to ensure that the motor stator is displaced relative to the cylinder body 13 when the motor stator is subjected to torque during the operation of the compressor; then the shrink-fit is performed on the magnetic levitation radial bearing; the cylinder body 13 and the magnetic levitation radial bearing are designed to have a small magnitude of interference. The radial bearing is only subjected to the radial force. The small magnitude of interference can ensure that there is no relative displacement between the cylinder body 13 and the magnetic levitation radial bearing. Then, the shrink-fit is performed on the displacement sensor assembly 17/5; and the cylinder body 13 and the displacement sensor assembly are also designed to have a small interference fit. Generally, as for the displacement sensor, the primary protection is only subjected to the radial force when the displacement sensor is started or stopped or the shaft operates unsteadily. If parts are not in place during the shrink-fit process, a hydraulic machine can be employed to press the parts to the specified positions. When the temperature of the cylinder body 13 drops too fast and the shrink-fit is not completely performed on the parts, the cylinder body 13 may be placed in a high-temperature box to continue heating, but it should be noted that the heating temperature is definitely less than the maximum temperature of the parts operating on the cylinder body 13 (if it is found that the temperature of the cylinder body 13 is already lower after the shrink-fit is performed on the motor stator and is not enough to perform the shrink-fit on the magnetic levitation bearing stator, the assembly of the cylinder body is continuously heated, but the heating temperature cannot be higher than the maximum temperature allowed by the stator winding, otherwise the enameled wire as well as the insulation between the wire and the wire can be damaged).

(7) Next, the rotating shaft 22 with the motor rotor 12 and the magnetic levitation front radial bearing rotor 16 is installed into the cylinder body 13; the magnetic levitation front axial bearing stator 3 is locked on the cylinder 13 by using screws, the thrust bearing is shrink-fitted on the rotating shaft, the magnetic levitation rear axial bearing is locked on the cylinder by using screws; finally, the box body is butted to the cylinder body, with the pneumatic parts installed and the end cover of the compressor installed.

(8) The aforementioned description is merely preferred embodiment of the disclosure, and is not intended to limit the disclosure. For those skilled in the art, the disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.