CN102857014A

CN102857014A - Motor insulation bearing chamber

Info

Publication number: CN102857014A
Application number: CN2012103439986A
Authority: CN
Inventors: 杜铖; 孙成章; 韩军柱; 柳毅; 王锐
Original assignee: XI'AN KYLIN ELECTRIC CO Ltd
Current assignee: XI'AN KYLIN ELECTRIC CO Ltd
Priority date: 2012-09-17
Filing date: 2012-09-17
Publication date: 2013-01-02

Abstract

The invention discloses a motor insulation bearing chamber which is formed through connection of a bearing inner cover and a bearing outer cover. A bearing inner cover insulation layer made from non-conducting material is casted on the surface of the inner side of the bearing inner cover, which is contacted with a bearing, and a bearing outer cover insulation layer made from non-conducting material is casted on the surface of the inner side of the bearing outer cover, which is contacted with a bearing. With the adoption of the motor insulation bearing chamber, the problem that the current of a motor shaft is incompletely cut in the prior art is solved; and meanwhile, the motor insulation bearing chamber is convenient to be applied to a flame-proof type motor because an insulation material does not appear on a flame-proof surface.

Description

The electrical machine insulation bearing chamber

Technical field

The invention belongs to the motor device technical field, be specifically related to a kind of electrical machine insulation bearing chamber.

Background technology

Motor has the larger axis electric current because of self structure problem or external power source problem, and motor bearings is owing to the reason of galvanic corrosion can be damaged very soon, and therefore, prior art generally adopts insulation bearing or insulated end cover, mode block the motor shaft electric current.But the insulating barrier of this dual mode is relatively thin, and the effect of the Alternating Component of blocking-up motor shaft electric current is relatively poor, and bearing life can shorten; In addition, the high and large specification bearing of insulation bearing application cost is difficult the order, thereby nonmetallic materials exist problem of aging to make the insulated end cover technology use comparatively difficulty in explosion-proof motor.

Summary of the invention

The purpose of this invention is to provide a kind of electrical machine insulation bearing chamber, solved the halfway problem of prior art blocking-up motor shaft electric current, simultaneously because this insulating material does not appear at explosion suppresion surface, thereby be convenient to be applied in the explosion-proof motor.

The technical solution adopted in the present invention is, a kind of electrical machine insulation bearing chamber, it is characterized in that, connected to form by internal bearing cover and bearing end cover, the internal bearing cover insulating barrier that has non-conducting material to make with the contacted inner surface casting of bearing or die casting on the internal bearing cover, the bearing end cover insulating barrier that has non-conducting material to make with the contacted inner surface casting of bearing or die casting on the bearing end cover.

Non-conducting material is MC nylon, modified thermoplastic polyester, Noryl or novolac resin.

The thickness of internal bearing cover insulating barrier and bearing end cover insulating barrier is 1～10mm.

Internal bearing cover is connected by connecting bolt with bearing end cover.

The beneficial effect of electrical machine insulation bearing chamber of the present invention is: the internal bearing cover insulating barrier that can realize and the thickness of bearing end cover insulating barrier are relatively large, outside the direct current composition of motor shaft electric current can be blocked fully, Alternating Component can be blocked preferably, and the galvanic corrosion meeting of bearing is very little.Simultaneously because internal bearing cover insulating barrier and bearing end cover insulating barrier all are positioned at bearing chamber inside, so very convenient in the application meeting of explosion separation motor.

Description of drawings

Fig. 1 is the assembling schematic diagram of electrical machine insulation bearing chamber of the present invention on motor shaft;

Fig. 2 is the assembling schematic diagram of the internal bearing cover insulating barrier casting among the present invention;

Fig. 3 is the structural representation with the internal bearing cover of internal bearing cover insulating barrier among the present invention;

Fig. 4 is the assembling schematic diagram of the bearing end cover insulating barrier casting among the present invention;

Fig. 5 is the structural representation with the bearing end cover of bearing end cover insulating barrier among the present invention;

Wherein, 1. internal bearing cover, 2. internal bearing cover insulating barrier, 3. bearing, 4. connecting bolt, 5. bearing end cover insulating barrier, 6. bearing end cover, 7. motor shaft, 8. split-type injection molding, 9. the first cavity, 10. internal bearing cover strutting piece, 11. bulk-breaking formula injection moldings, 12. second cavitys, 13. bearing end cover strutting pieces.

Embodiment

As shown in Figure 1, electrical machine insulation bearing chamber of the present invention is connected to form by internal bearing cover 1 and bearing end cover 6.The internal bearing cover insulating barrier 2 that has non-conducting material to make with bearing 3 contacted inner surface casting or die casting on the internal bearing cover 1, the bearing end cover insulating barrier 5 that has non-conducting material to make with bearing 3 contacted inner surface casting or die casting on the bearing end cover 6.Usually, the thickness of internal bearing cover insulating barrier 2 and bearing end cover insulating barrier 5 is 1～10mm, can satisfy the needs of blocking-up motor shaft electric current; Under special circumstances, can also suitably increase the thickness of internal bearing cover insulating barrier 2 and bearing end cover insulating barrier 5.The material of internal bearing cover insulating barrier 2 and bearing end cover insulating barrier 5 is MC nylon, modified thermoplastic polyester (PBT), Noryl (PPO/MPPO) or novolac resin etc.Internal bearing cover 2 is connected by connecting bolt 4 with bearing end cover 6.

Below for adopting casting method to prepare internal bearing cover insulating barrier 2 among the present invention and the concrete steps of bearing end cover insulating barrier 5:

As shown in Figures 2 and 3, internal bearing cover strutting piece 10 is set below plain bearing inner cap 1, and lay the split-type injection molding 8 that adapts with its cavity shape in the inside of this internal bearing cover 1, and wherein, the first cavity 9 of the inner surface of split-type injection molding 8 outer surfaces and internal bearing cover 1 formation; With heating furnace the combinations thereof body is heated, then the non-conducting material with liquid state injects the first cavity 9, after the non-conducting material cooling, removes split-type injection molding 8, namely forms the internal bearing cover 1 with internal bearing cover insulating barrier 2 among the present invention.

As shown in Figure 4 and Figure 5, bearing end cover strutting piece 13 is set below plain bearing enclosing cover 6, and lay the bulk-breaking formula injection molding 11 that adapts with its cavity shape in the inside of this bearing end cover 6, and wherein, the second cavity 12 of the inner surface of bulk-breaking formula injection molding 11 outer surfaces and bearing end cover 6 formation; With heating furnace the combinations thereof body is heated, then the non-conducting material with liquid state injects the second cavity 12, after the non-conducting material cooling, removes bulk-breaking formula injection molding 11, namely forms the bearing end cover 6 with bearing end cover insulating barrier 5 among the present invention.

Internal bearing cover insulating barrier 2 and bearing end cover insulating barrier 5 can also adopt conventional die casting mode to make.The present invention is installed on the motor shaft 7 in use, and inside is equipped with bearing 3.The present invention can effectively cut off the shaft current of motor, avoids bearing to be damaged by serious galvanic corrosion.

Insulating barrier in the electrical machine insulation bearing chamber of the present invention and bearing internal external lid are cast or are die cast as one, again with the integrated processing of other size, so and the mounted insulated end cover of insulating sticky (uses insulation film to wrap between bearing and the bearing chamber outward, the thickness of insulation film can only be controlled at 0.2～0.3mm) and compare, and following some advantage is arranged: 1, fitted position is more accurate; 2, Assembly part is few, and the dismounting bearing is more convenient, and is difficult for makeing mistakes, and can not produce the failure of insulation that causes because of the assembling error; 3, insulation thickness is larger, the Alternating Component better effects if of blocking-up shaft current; 4, insulating barrier is convenient to use in explosion-proof motor not on explosion suppresion surface; 5. the connecting bolt place need not add insulation cushion, connects more reliable.

Claims

1. electrical machine insulation bearing chamber, it is characterized in that, connected to form by internal bearing cover (1) and bearing end cover (6), the internal bearing cover insulating barrier (2) that described internal bearing cover (1) is upper and the contacted inner surface of bearing (3) is cast or die casting has non-conducting material to make, the bearing end cover insulating barrier (5) that described bearing end cover (6) is upper and the contacted inner surface of bearing (3) is cast or die casting has non-conducting material to make.

2. according to electrical machine insulation bearing chamber claimed in claim 1, it is characterized in that, described non-conducting material is MC nylon, modified thermoplastic polyester, Noryl or novolac resin.

3. according to claim 1 or 2 described electrical machine insulation bearing chambers, it is characterized in that, the thickness of described internal bearing cover insulating barrier (2) and bearing end cover insulating barrier (5) is 1～10mm.

4. according to electrical machine insulation bearing chamber claimed in claim 1, it is characterized in that, described internal bearing cover (2) is connected by connecting bolt (4) with bearing end cover (6).