CN101771307A

CN101771307A - Rotor supporting structure of high speed electric rotary machine and rotary machine

Info

Publication number: CN101771307A
Application number: CN200810237258A
Authority: CN
Inventors: 何君; 伍怀秋; 何应明
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2010-07-07

Abstract

The invention discloses a rotor supporting structure of a high speed electric rotary machine. Two end parts of radical sliding bearings at journals of two ends of a rotor are sheathed with a pair of angular contact ball bearings, constant-pressure prestressing is adopted between the two ball bearings, the two balling bearings are embedded in a floating bush, and the outer side end of the floating bush is provided with a check ring and a stop dog to limit the floating bush from moving and rotating along the axial direction and enable the floating bush to be loaded in a bearing seat hole with a certain fit clearance to be in a semi-floating state, thus forming a semi-floating rolling-sliding double bearing. When the high power high speed electric rotary machine adopting the rotor supporting structure of the invention is arranged in a vehicle which runs high speed of above 60000r/min, due to the action of the semi-floating rolling-sliding double bearing, the system can be stably and reliably operated.

Description

A kind of rotor support structure of high speed electric rotary machine and this rotating machinery

Technical field

The present invention relates to a kind of rotor support structure that is used for high speed electric rotary machine, being particularly related to and being used to be installed in transport facility---the rotor bearing by the electric motor driven cold air machine of high-capacity and high-speed, air compressor etc. on the vehicle etc., its rotor is for example to be not less than the high speed rotating of the tens thousand of commentaries on classics of per minute.

Background technology

One of technical problem underlying of high-power, high-revolving high-speed motor (20kw is more than the 60000/min) design is exactly a design bearing.At present, this high-power, high-revolving motor bearings design is generally all considered to adopt the active magnetic bearing support pattern of electromagnetic bearing and rolling bearing mixing bearing, but this magnetic bearing automatically controlled and make complicatedly costs an arm and a leg, reliability is lower, at present can't commercialization; The use that reasons such as the friction loss of liquid sliding bearing during because of motor high speed rotating bearing capacity big and the air sliding bearing is little also are subjected to a certain degree limits; Adopt composite ceramics ball angular contact ball bearing as this high-power, high-revolving motor bearings, at present the domestic relevant report that yet there are no.

The invention provides a kind of dual bearing support structure of semi-floating Roll-Sliding that is installed on the transport facility that is applicable to, system's reliability service has been played crucial effects by application such as high-speed motor driven air refrigeration machine, air compressors.

Summary of the invention

The technical scheme that invention is adopted is, though the rotating speed when considering high-speed motor driven air refrigeration machine, air compressor running is very high, but external applied load is more even, and the running accuracy requirement to rotor system is not very high, therefore, designing a kind of is not very high and reliability height, bearing friction loss are little, service life is long combined type bearing to the motor rotation required precision, and promptly the dual bearing of Roll-Sliding proposes thus; On the other hand, owing to be installed in high-speed motor driven air refrigeration machine on the transport facility, the air compressor work and can't avoid vibration, and a variety of causes that works long hours of rotor, dynamic balance accuracy might destroy to some extent, except requiring rotor initially just to have certain dynamic balance accuracy, what is more important makes bearing want to absorb vibrational energy, works reliably to guarantee bearing.Therefore, the dual bearing of Roll-Sliding being taked the structural design of whole semi-floating, just can form the elastic bearing of rotor system and the oil film vibration damping in the work, also is one of main technical schemes of taking of the present invention.

The invention has the beneficial effects as follows, because rotor system adopts the dual bearing of semi-floating Roll-Sliding, during the motor high-speed cruising, relative rotation speed between the floating bushing three supports mutually greatly reduces armature spindle--the dual bearing of Roll-Sliding---, friction power loss reduces, and bearing life is able to raising to a great extent; And the axle journal of rotor is non-rigid the contact with bush(ing) bearing, and elastic bearing that forms between floating bushing and the bearing saddle bore and oil film vibration damping, has absorbed the vibrational energy of rotor to a great extent.When the rotor of high speed electric rotary machine turns round more than 60000r/min, system's stable and reliable operation.

Description of drawings

Fig. 1 is the front view of the cold air machine embodiment of a kind of conduct high speed electric rotary machine of comprising rotor support structure of the present invention.

Fig. 2 is the front view of the dual bearing embodiment of semi-floating Roll-Sliding of the present invention.

Fig. 3 is the view of the bush(ing) bearing among Fig. 2.

Embodiment

Below in conjunction with accompanying drawing specific embodiments of the invention are described.Fig. 1 is expressed as a kind of front view of cold air machine 1, and this refrigeration machine 1 is directly driven by a motor 4 that comprises the dual bearing 5 of semi-floating Roll-Sliding of the present invention.Among Fig. 1, cold air machine 1 comprises a motor 4 in the middle.Motor 4 comprises rotor 2 and stator 3.The dual bearing 5 of the opposed semi-floating Roll-Sliding in rotor 2 both sides.The bearing pedestal 6 of left end is formed left cooling jacket with left water jacket plug 12, and the bearing pedestal 6 of right-hand member is formed right cooling jacket with right water jacket plug 7.The cooling jacket that soldering is formed stator 3 by the stator overcoat 9 and the body 11 of radiating fin 10.Refrigeration impeller 13 and compression impellor 8 are fixed on two shaft ends of rotor 2.Enter motor 4 inner coolings from turbine outlet extension cold air.

Fig. 2 represents the dual bearing 5 of semi-floating Roll-Sliding on above-mentioned cold air machine 1 right side.

Among Fig. 2, on bush(ing) bearing 26 both ends on rotor 2 axle journals, nested a pair of composite ceramics ball angular contact ball bearing 15a, 15b and be back-to-back mounting means, the other oil spout lining ring I17 that is provided with of ball bearing 15a, the other oil spout lining ring II21 that is provided with of ball bearing 15b, disk spring 27 places between oil spout lining ring I17 and the oil spout lining ring II21, and two ball bearings are implemented level pressure pretension and compensating axial play, and is whole to slide in the prescription formula embedding floating bushing 14.Axial screw 19 restriction oil spout lining ring I17 only move axially, and limit screw 20 is fixed on oil spout lining ring II21 in the floating bushing 14.

Outside end face 25 after ball bearing 15b and bush(ing) bearing 26 combinations is with thrust slide bearing 24 common formation internal layer thrust slide bearing pairs.

Respectively be provided with twice O shape rubber seal 16 on the cylindrical both ends of floating bushing 14, circlip for shaft 22 and block 23 are set on the outboard end, move axially and rotate with restriction floating bushing 14, make that integral body is in the semifloating state in end bearing seat 6 holes, the left and right sides with certain fit clearance in its load map 1, form the oil film vibration damping in elastic bearing and the work, totally constitute the dual bearing 5 of opposed, the bidirectionally limited semi-floating Roll-Sliding in rotor 2 two ends.

Among Fig. 2, big end one side of the inner and outer ring of ball bearing 15a, 15b, the radial hole that to have 1-3 diameter on the circumference at raceway edge be 0.7mm forms oil leab under the ring of ball bearing; The aperture that to have 1-3 diameter on oil spout lining ring I17 and the oil spout lining ring II21 end face circumference by ball bearing 15a, 15b one side be 0.7mm, formation jet lubrication oil duct.The beneficial effect of doing like this is, ball bearing under the acting in conjunction of lubricated under the ring and jet lubrication, the d of ball bearing _mThe n value can be further enhanced, if adopt the dual bearing 5 of semi-floating Roll-Sliding to reduce its working speed with this understanding again, will prolong the useful life of ball bearing to a great extent.

Also be provided with the through hole 18 of introducing turbine outlet cold air on floating bushing 14 among Fig. 2, the oil spout lining ring I17, cooling is forced in bearing inside.

Among Fig. 3, the endoporus two ends of bush(ing) bearing 26 are as the journal rest face of rotor 2, the square shallow oil pocket of uniform three 8-12mm on the journal rest face of every end, and the middle part is designed to cavity and has three row's radial direction through hole, forms oil drain passage; Low pressure lubricating oil by oil spout lining ring I17 and oil spout lining ring II21 introducing, introduce in the bush(ing) bearing 26 by circuit oil groove on the bush(ing) bearing 26 cylindrical both sides and the axially uniform aperture in footpath that is communicated with the circuit oil groove, provide chargeoil to the interior ring of sliding bearing 26 and ball bearing 15a, 15b radially respectively; Also have 1-3 aperture that is communicated with square oil pocket on the outside end face of bush(ing) bearing 26, provide chargeoil to thrust slide bearing 24.

Because the rotor support structure of the dual bearing 5 of semi-floating Roll-Sliding among Fig. 2, by the represented cold air machine 1 of Fig. 1, effect is significant during high-speed cruising.

Claims

1. the rotor support structure of a high speed electric rotary machine comprises:

Nested a pair of composite ceramics ball angular contact ball bearing (15a on bush(ing) bearing (26) both ends on the axle journal of rotor (2) two ends, 15b) and be back-to-back mounting means, the other oil spout lining ring I (17) that is provided with of ball bearing (15a), the other oil spout lining ring II (21) that is provided with of ball bearing (15b), disk spring (27) places between oil spout lining ring I (17) and the oil spout lining ring II (21), to two ball bearing (15a, 15b) implement level pressure pretension and compensating axial play, whole to slide in the prescription formula embedding floating bushing (14), axial screw (19) restriction oil spout lining ring I (17) only moves axially, and limit screw (20) is fixed on oil spout lining ring II (21) in the floating bushing (14);

Outside end face (25) after ball bearing (15b) makes up with bush(ing) bearing (26) constitutes internal layer thrust slide bearing pair jointly with thrust slide bearing (24);

Respectively be provided with twice O shape rubber seal (16) on the cylindrical both ends of floating bushing (14), circlip for shaft (22) and block (23) are set on the outboard end, restriction floating bushing (14) moves axially and rotates, make that integral body is in the semifloating state in its left and right sides end bearing seat (6) hole with certain fit clearance of packing into, form elastic bearing, totally constitute opposed, the bidirectionally limited semi-floating in rotor (2) two ends and roll a slip dual bearing (5).

2. the dual bearing of semi-floating Roll-Sliding according to claim 1 (5) is characterized in that,

Big end one side of the inner and outer ring of ball bearing (15a, 15b), the radial hole that to have 1-3 diameter on the circumference at raceway edge be 0.5-1.0mm forms oil leab under the ring of ball bearing; The aperture that oil spout lining ring I (17) and oil spout lining ring II (21) lean on and have 1-3 diameter on the end face circumference of ball bearing (15a, a 15b) side is 0.5-1.0mm forms the jet lubrication oil duct.

3. the dual bearing of semi-floating Roll-Sliding according to claim 1 (5) is characterized in that,

The endoporus two ends of bush(ing) bearing (26) are as the journal rest face of rotor (2), the square shallow oil pocket of uniform three 8-12mm on the journal rest face of every end, and the middle part is designed to cavity and has number row radial direction through hole, forms oil drain passage; Low pressure lubricating oil by oil spout lining ring I (17) and oil spout lining ring II (21) introducing, introduce in the bush(ing) bearing (26) by circuit oil groove on bush(ing) bearing (26) the cylindrical both sides and the axially uniform aperture in footpath that is communicated with the circuit oil groove, provide chargeoil to the interior ring of sliding bearing (26) and ball bearing (15a, 15b) radially respectively; Also have 1-3 aperture that is communicated with square oil pocket on the outside end face of bush(ing) bearing (26), provide chargeoil to thrust slide bearing (24).

4. the dual bearing of semi-floating Roll-Sliding according to claim 1 (5) is characterized in that,

Floating bushing (14), oil spout lining ring I (17) are provided with the through hole (18) of introducing extraneous cold air, and cooling is forced in bearing inside.

5. a high speed electric rotary machine comprises a rotor support structure by the claim 1 dual bearing of described semi-floating Roll-Sliding (5).