Protective bearing assembly, magnetic levitation system and compressor

By designing protective bearing components in the magnetic levitation bearing system and utilizing vibration damping elements to provide radial and axial buffering forces, the impact force problem when the rotor shaft falls is solved, thereby improving the absorption efficiency and service life of the protective bearing.

CN224515681UActive Publication Date: 2026-07-17CHONGQING MIDEA GENERAL REFRIGERATING EQUIP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHONGQING MIDEA GENERAL REFRIGERATING EQUIP CO LTD
Filing Date
2025-07-31
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing magnetic levitation bearings, the protective bearing is prone to failure due to excessive impact force when the rotor shaft falls, leading to damage to other components.

Method used

A protective bearing assembly is designed, including a first protective mechanism and an optional second protective mechanism. By placing a damping element between the fixing member and the protective bearing, radial and axial buffering forces are provided to absorb the impact energy when the rotor shaft falls.

Benefits of technology

It improves the energy efficiency of rotor shaft buffering, reduces the risk of damage to protective bearings, extends service life, and simplifies the overall structural layout of the machine.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a kind of protection bearing assembly, magnetic suspension system and compressor, wherein, protection bearing assembly is used for compressor and is sleeved in rotor shaft outside, it includes first protection mechanism, first protection mechanism includes first protection bearing, first fixed part, first damping part and second damping part, the inner ring of first fixed part has the first accommodating cavity compatible with first protection bearing, along the radial direction of first protection bearing, first accommodating cavity is opened with first damping groove on the side surface of first protection bearing, first damping part is set in first damping groove. Along the axial direction of first protection bearing, two second damping parts are located on the opposite sides of first protection bearing respectively. The protection bearing assembly of the utility model, by setting first damping part and two second damping parts, first protection bearing can be buffered along the axial direction and radial direction of first protection bearing, help to solve the problem that the impact force that present protection bearing is instantaneously sustained is too large after rotor shaft falls.
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Claims

1. A protective bearing assembly for a compressor and fitted over a rotor shaft of the compressor, characterized in that, The protective bearing assembly includes a first protective mechanism, which includes: First protective bearing; The first fixing member has an inner ring with a first receiving cavity adapted to the first protective bearing. Along the radial direction of the first protective bearing, a first damping groove is provided on the side of the first receiving cavity facing the first protective bearing. The first damping member is disposed in the first damping groove and has a compressed state that abuts against the first protective bearing. The second damping component, of which there are two, is located along the axial direction of the first protective bearing. The two second damping components are respectively located on opposite sides of the first protective bearing, and the two opposite sides of each second damping component abut against the first protective bearing and the first fixing component, respectively.

2. The protected bearing assembly of claim 1, wherein, The first fixing member includes a first bearing seat and a first bearing cover connected together. Along the axial direction of the first protective bearing, a first slot is provided on the side of the first bearing seat. The side of the first bearing cover facing the first bearing seat cooperates with the first slot to form the first receiving cavity and the first vibration damping groove.

3. The protected bearing assembly of claim 2, wherein, Along the axial direction of the first protective bearing, a first mounting groove is provided on the side of the first slot opposite to the first bearing cover, and a second mounting groove is provided on the first bearing cover. The two second vibration damping members are respectively housed in the first mounting groove and the second mounting groove.

4. The protected bearing assembly of claim 2, wherein, The first protection mechanism also includes: A sleeve, which is used to be sleeved on the rotor shaft, and the first bearing seat is sleeved on the sleeve; The first limiting member is located along the axial direction of the first protective bearing. The first limiting member is disposed on the side of the first bearing seat away from the first bearing cover and abuts against the first protective bearing and the sleeve. The second limiting member is located along the axial direction of the first protective bearing, clamped between the first protective bearing and the first bearing cap, and abuts against the sleeve.

5. The protected bearing assembly of claim 1, wherein, The number of the first damping grooves is at least three, and the at least three first damping grooves are arranged at intervals along the circumference of the first protective bearing, and each first damping groove is provided with a first damping element inside; And / or, the number of the first protective bearings is two, the two first protective bearings are fitted together along the axial direction of the first protective bearings, and the length of the first damping member is greater than the sum of the lengths of the two first protective bearings.

6. The protected bearing assembly of any of claims 1-5, wherein, The protective bearing assembly further includes a second protective mechanism, which is disposed at opposite ends of the rotor shaft, corresponding to the first protective mechanism; the second protective mechanism includes: Second protective bearing; The second fixing member has a second receiving cavity adapted to the second protective bearing, and a second damping groove is provided on the side of the second receiving cavity facing the second protective bearing along the radial direction of the second protective bearing. The third damping component is disposed in the second damping groove and has a compressed state that abuts against the second protective bearing.

7. The protected bearing assembly of claim 6, wherein, The second fastener includes: The second bearing housing has a second slot. The second bearing cover has a third slot on its side facing the second bearing seat, along the axial direction of the second protective bearing. The second bearing housing is connected to the second bearing cap, and the second slot and the third slot cooperate to form the second receiving cavity and the second vibration damping groove.

8. The protected bearing assembly of claim 7, wherein, The number of the second damping grooves is at least three, and at least three of the third damping elements are arranged at circumferential intervals along the second protective bearing.

9. A magnetic levitation system, characterized by It includes a rotor shaft and a protective bearing assembly as described in any one of claims 1 to 8, the protective bearing assembly being sleeved on the outside of the rotor shaft.

10. A compressor characterized by, Including the magnetic levitation system as described in claim 9.