CN103074017B

CN103074017B - Insulation Technology of Spherical Bearing of High Voltage AC Motor

Info

Publication number: CN103074017B
Application number: CN201210558856.1A
Authority: CN
Inventors: 夏敏志; 祁世发; 方建国; 刘洋
Original assignee: Harbin Electric Power Equipment Co Ltd
Current assignee: Harbin Electric Power Equipment Co Ltd
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2014-01-29
Anticipated expiration: 2032-12-21
Also published as: CN103074017A

Abstract

The invention relates to an insulation process for a spherical bearing of a high-voltage AC motor, which meets the insulation requirements of the end cover type spherical bearing of a large and medium-sized motor, prevents the generation of shaft current, and eliminates the electric corrosion of the shaft and bearing bush caused by the shaft current. The invention uses the preferred bearing insulating material and special adhesive to bond the bearing insulation to the spherical surface of the bearing seat, solving the technical problems of bonding and oil resistance between the bearing insulating material and the supporting spherical surface of the bearing seat. It has excellent connection and insulation effects, effectively prevents the generation of shaft current, and can be used as insulation for large and medium-sized motor spherical bearings.

Description

High-voltage AC motor spherical bearing insulating process

Technical field

The present invention relates to a kind of high-voltage AC motor spherical bearing insulating process.

Background technique

End cover type spherical bearing is the important rotatable parts of large and medium-sized AC motor, in motor operation course, due to electromagnetic induction effect, on motor shaft, produce induced voltage, and form behind loop between diaxon bearing and ground, between axle and bearing support, produce shaft current, this electric current produces electro erosion to bearing surface and axle surface, can destroy bearing shell tiling and axle body surface finishment, cause bearing bush abrasion, finally cause tile kilning fault.Therefore,, for preventing shaft current, must must add one deck bearing insulation in bearing support and coordinating on sphere of bearing shell, to prevent the generation of shaft current.Technological difficulties are that whole bearing part all operates in lubricant oil, bearing insulation sticks on the support sphere of bearing support, bearing shell spheric seating is on the surface of bearing insulation, therefore require bearing insulation not only to want good insulation preformance, also to get well with the adhesive property of bearings sphere simultaneously, little with the friction factor of bearing shell sphere, the oil resistance of bearing insulation is good.

Summary of the invention

The object of this invention is to provide a kind of high-voltage AC motor spherical bearing insulating process, to meet the insulating requirements of large and middle size motor end cover type spherical bearing, prevent the generation of shaft current, eliminate the galvanic corrosion of shaft current to axle and bearing shell.

Technological scheme of the present invention is a kind of big-and-middle-sized high-voltage AC motor spherical bearing insulating process:

1, a kind of big-and-middle-sized high-voltage AC motor spherical bearing insulating process:

1) sphere insulation (2) is cut into fan-shaped by product drawing size, every limit reserves

20mm machining allowance;

2) trim ring (1), base (3), pressing mold (4) are put into drying oven and be heated to 100 ℃, after insulation 2h, take out;

3) sphere insulation (2) is attached on base (3);

4) in sphere insulation outside, load onto pressing mold (4);

5) trim ring (1) is contained on pressing mold (4);

6) adopt C type fixture (5) that trim ring (1) and base (3) are clamped;

7) keep impaction state, naturally cool to clamper for disassembling (5) after room temperature, trim ring (1), pressing mold (4), the sphere insulation of tentatively having suppressed is taken out, and edge is pruned;

8), by upper bearing bracket (6) sphere and step (10) sphere edge corner angle file filing, with cotton, dip in acetone or gasoline wiping bonding plane, to remove greasy dirt, dust;

9) sphere insulation (8) is installed to respectively on upper bearing bracket (6) sphere and step (10) sphere, join in fact the size of sphere insulation (8);

10) 50 grams of room-temperature curing epoxy glue B component HPC56102-B are slowly poured in 200 grams of room-temperature curing epoxy glue A component HPC56102-A, fully stir, mix;

11) adopt hairbrush that the binder mixing is evenly applied on upper bearing bracket (6) sphere and step (10) sphere;

12) sphere insulation (8) is sticked on upper bearing bracket (6) sphere and step (10) sphere;

13) lower bearing (11) is placed in the bonding sphere insulation of step (10) (8);

14) top bearing shell (7) is installed on lower bearing (11);

15) upper bearing bracket (6) is assembled on top bearing shell (7);

16) with screw (9) by upper bearing bracket (6) and step (10) tightly;

17), at 15～40 ℃, solidify 24h;

18) 500V megger is surveyed insulation resistance between bearing shell and bearing support, and R >=20M Ω is qualified.The technical order of bearing insulation material is shown in Fig. 3, and this material has:

1) good self-lubricating property and wear-resisting property,

2) good manufacturability,

3) stable chemical performance, insulating property are good,

4) friction factor of metal is low to moderate to 0.07, the friction factor of self is low to moderate 0.01, and dynamic and static friction factor is little, and greasy property is good,

5) between surface and bearing support, having can cementability,

Bearing insulation material main performance index meets bearing insulation technical requirements.

Bearing insulation bonding

The double-component binder that the binder that is used for bonding bearing insulation is room curing, this binder ambient temperature curable, easy to use, adhesive effect is good.Main performance index is shown in Fig. 4 table 2, and experimental result shows that this special bonding agent is good to the adhesive effect between the spherical support seat of bearing insulation and bearing support.

The technology of the present invention advantage

The present invention utilizes preferred bearing insulation material and special-purpose binder, bearing insulation is bonded on bearing support sphere, solve bearing insulation material and bearing support and supported the bonding and oil resistance technical barrier between sphere, through experiment, bonding and insulation effect is splendid, effectively prevented the generation of shaft current, can be used as large and medium-sized motor spherical bearing insulation and use.

Accompanying drawing explanation

Fig. 1 is spherical bearing insulation compacting schematic diagram, and in figure, trim ring 1, sphere insulation 2, base 3, pressing mold 4; C type folder 5;

Fig. 2 is that schematic diagram is joined in the tipping of end cover type spherical bearing insulating sticky, and in figure, upper bearing bracket 6, top bearing shell 7, sphere insulation 8, bolt 9, step 10, lower bearing 11.

Fig. 3 is table 1 insulating layer material main performance index table

Fig. 4 is table 2 adhesive glue performance index

Embodiment

As depicted in figs. 1 and 2, a kind of big-and-middle-sized high-voltage AC motor spherical bearing insulating process is as follows:

1) sphere insulation 2 is cut into fan-shaped by product drawing size, every limit reserves 20mm machining allowance;

2) trim ring 1, base 3, pressing mold 4 are put into drying oven and be heated to 100 ℃, after insulation 2h, take out;

3) sphere insulation 2 is attached on base 3;

4) in sphere insulation outside, load onto pressing mold 4;

5) trim ring 1 is contained on pressing mold 4;

6) adopt C type fixture 5 that trim ring 1 and base 3 are clamped;

7) keep impaction state, naturally cool to clamper for disassembling 5 after room temperature, trim ring 1, pressing mold 4, the sphere insulation of tentatively having suppressed is taken out, and edge is pruned;

8), by upper bearing bracket 6 spheres and step 10 sphere edge corner angle file filings, with cotton, dip in acetone or gasoline wiping bonding plane, to remove greasy dirt, dust;

9) sphere insulation 8 is installed to respectively on upper bearing bracket 6 spheres and step 10 spheres, join in fact the size of sphere insulation 8;

11) adopt hairbrush that the binder mixing is evenly applied on upper bearing bracket 6 spheres and step 10 spheres;

12) sphere insulation 8 is sticked on upper bearing bracket 6 spheres and step 10 spheres;

13) lower bearing 11 is placed in the bonding sphere insulation 8 of step 10;

14) top bearing shell 7 is installed on lower bearing 11;

15) upper bearing bracket 6 is assembled on top bearing shell 7;

16) with screw 9, upper bearing

bracket

6 and 10 of steps is tight;

17), at 15～40 ℃, solidify 24h;

18) 500V megger is surveyed insulation resistance between bearing shell and bearing support, and R >=20M Ω is qualified.

Claims

1. A process for insulating spherical bearings of large and medium-sized high-voltage AC motors, characterized by:

1) Spherical insulation (2) Cut into a fan shape according to the size of the product drawing, leaving 20mm machining allowance on each side;

2) Put the pressure ring (1), base (3) and die (4) into the drying oven and heat to 100°C, keep warm for 2 hours and take them out;

3) Paste the spherical insulation (2) on the base (3);

4) Mount the die (4) on the outside of the spherical insulation;

5) Install the pressing ring (1) on the pressing die (4);

6) Use the C-shaped clamp (5) to clamp the pressure ring (1) and the base (3);

7) Keep the pressed state, and after cooling down to room temperature naturally, disassemble the fixture (5), pressure ring (1), and pressure mold (4), take out the preliminarily pressed spherical insulation, and trim the edges;

8) File the edges and corners of the spherical surface of the upper bearing seat (6) and the spherical surface of the lower bearing seat (10) flat with a file, and wipe the bonding surface with cotton cloth dipped in acetone or gasoline to remove oil and dust;

9) Install the spherical insulation (8) on the spherical surface of the upper bearing seat (6) and the spherical surface of the lower bearing seat (10) respectively, and match the size of the spherical insulation (8);

10) Slowly pour 50 grams of room temperature curing epoxy adhesive B component HPC56102-B into 200 grams of room temperature curing epoxy adhesive A component HPC56102-A, stir well, and mix well;

11) Apply the mixed adhesive evenly on the spherical surface of the upper bearing seat (6) and the spherical surface of the lower bearing seat (10) with a brush;

12) Paste the spherical insulation (8) on the spherical surface of the upper bearing seat (6) and the spherical surface of the lower bearing seat (10);

13) Put the lower bearing bush (11) on the lower bearing housing (10) on which the spherical insulation (8) has been bonded;

14) Install the upper bearing bush (7) onto the lower bearing bush (11);

15) Assemble the upper bearing seat (6) to the upper bearing bush (7);

16) Tighten the upper bearing seat (6) and the lower bearing seat (10) with screws (9);

17) Curing for 24 hours at 15-40°C;

18) Measure the insulation resistance between the bearing bush and the bearing seat with a 500V shaking meter, R≥20MΩ is qualified.