CN110985870A - Oil mist overflow preventing device for thrust bearing of high-speed generator - Google Patents

Abstract

The invention relates to a high-speed generator thrust bearing anti-oil mist overflow device, which can effectively solve the problem of oil mist overflow of the thrust bearing. The left, right and upper walls of the cavity are equipped with oil mist collectors. The first heavy oil mist collector is placed in the cavity close to the side of the bearing cover. The double oil mist collector is in close contact, which not only acts as a seal, but also collects the oil mist thrown out. The second heavy oil mist collector is placed above the contact between the bearing cover and the thrust head, and the third heavy oil mist collector is placed The top surface of the cavity is closely attached to the top surface. The invention has the advantages of simple structure, convenient and quick replacement and low cost, which can meet the safe operation requirements of the unit, and is an innovation in the anti-oil mist overflow device of the thrust bearing of the high-speed generator. .

Description

A high-speed generator thrust bearing anti-oil mist overflow device

technical field

The invention relates to the field of generator thrust bearings, in particular to a high-speed generator thrust bearing anti-oil mist overflow device.

Background technique

When the high-speed generator is running, the lubricating oil in the thrust bearing oil tank will form oil mist. The main reason for the appearance of oil mist is that the lubricating oil in the oil tank is thrown out by the rotating parts under the action of centrifugal force. After impact and splashing, oil mist will be generated. At the same time, the heat generated during the high-speed rotation of the thrust bearing will heat the lubricating oil, which will generate more oil mist; after the oil mist gathers to a certain extent, it escapes from the gap between the sealing part and the rotating part. The escaping oil mist will cause the following effects: (1) Pollution to the environment: the spilled oil mist will cause oil pollution on the floor of the plant and the cabinets; the oil mist will also cause pollution of the stator bars, leads, rotor magnetic poles and rotor spokes . (2) Threats to the safe operation of the unit: too much oil mist on the slip ring will cause ignition; the combination of oil mist and dust will block the ventilation holes, resulting in poor ventilation and heat dissipation performance of the generator, resulting in an increase in the temperature of the stator coil. It poses a threat to the safety and stability of the unit; the combination of oil mist and dust is corrosive to a certain extent, which will corrode the equipment, cause the insulation of the wire rods to age, and the performance to decline. (3) Increase the credit intensity of maintenance personnel: the viscous oil mist attached to the ground and the cabinet will cause cleaning difficulties and increase the labor intensity of maintenance personnel. Therefore, a high-speed generator thrust bearing is invented to prevent oil mist from overflowing. The installation is imperative.

SUMMARY OF THE INVENTION

In view of the above situation, in order to solve the defects of the prior art, the purpose of the present invention is to provide a high-speed generator thrust bearing anti-oil mist overflow device, which can effectively solve the problem of oil mist overflow of the thrust bearing.

The technical solution solved by the present invention is to include a pressing structure and an oil mist collector, the pressing structure and the bearing cover are connected together by bolts, and the left, right and upper walls of the inner cavity of the pressing structure are equipped with oil mist collectors The first heavy oil mist collector is placed in the cavity close to the side of the bearing cover, one side is in close contact with the inner side wall of the cavity, and the other side is in close contact with the second heavy oil mist collector, which not only plays a sealing role, but also It can collect the oil mist thrown out. The second heavy oil mist collector is placed above the contact between the bearing cover and the thrust head, and the end face gap between it and the thrust head is 10-20 wires, and the third heavy oil mist collector is placed in the cavity. On the inner top surface and close to the top surface, the fourth heavy oil mist collector is placed in the cavity close to the top of the thrust head and is closely attached to the inner side wall of the cavity, and the gap between the end face of the thrust head and the end face of the thrust head is 10-20 wires .

The invention has the advantages of simple structure, convenient and quick replacement and low cost, which can meet the safe operation requirements of the unit, and is an innovation on the oil mist overflow prevention device for the thrust bearing of the high-speed generator.

Description of drawings

FIG. 1 is a top view of the structure of the present invention.

FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 of the present invention.

FIG. 3 is a schematic diagram of the position of the structure of the present invention in the generator bearing.

FIG. 4 is a schematic diagram of the pressing structure of the present invention.

FIG. 5 is a schematic diagram of the anti-oil mist device of Example 1 of the present invention before modification.

Detailed ways

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

1-4, the present invention includes a pressing structure and an oil mist collector, the pressing structure 2 and the bearing cover 1 are connected together by bolts 3, and the left, right and upper parts of the inner cavity 7 of the pressing structure 2 are connected together. The walls are equipped with oil mist collectors. The first heavy oil mist collector 8 is placed in the cavity 7 close to the side of the bearing cover 1, one side of which is in close contact with the inner side wall of the cavity 7, and the other side is collected with the second heavy oil mist. The second heavy oil mist collector 9 is placed above the contact between the bearing cover 1 and the thrust head 6, and the end face clearance between it and the thrust head 6 is 10-20 wires, the third heavy oil mist collector 10 is placed on the top surface of the cavity 7 and is closely attached to the top surface, and the fourth heavy oil mist collector 11 is placed in the cavity 7 close to the top of the thrust head 6 and It is in close contact with the inner side wall of the cavity 7, and the gap between the end face of the thrust head 6 is 10-20 wires (1 wire is equal to 0.01mm).

In order to ensure the use effect, the first heavy oil mist collector 8 is directly adhered to the inner side wall of the cavity 7, and the second heavy oil mist collector 9 and the first heavy oil mist collector 8 are directly adhered together, and then the horizontal bolts 5 is pressed against the inner wall of the cavity 7 of the pressing structure 2, the third heavy oil mist collector 10 is stuck on the top surface of the cavity 7, and the bolt 5 will also support the third heavy oil mist collector 10 , the thickness of the third heavy oil mist collector 10 is suitable for the following support bolts 5 to press it on the top of the pressing structure 2, and the fourth heavy oil mist collector 11 is closed by the nut 4 and the bolt 5 (mechanical An industry term for two objects whose flat surfaces are bolted together) on the compression structure 2.

The oil mist collectors are circular rings made of industrial felt or high-temperature oil-absorbing materials; the height and thickness of each oil mist collector can be determined according to the specific thrust bearing conditions, and each oil mist collector cannot be pressed to death on the end face of the bearing. and thrust head end face.

The compression structure 2 is composed of four parts, A, B, C, and D. The compression structure 2 can be cast as a whole, or can be welded from four parts, wherein the A part and the C part are both circular rings. , Parts B and D are cylindrical, each part can be made of iron, stainless steel, aluminum alloy, copper or other metal materials, the thickness of the four parts needs to be determined according to the actual situation, the thickness of part A is about 2-8mm, The thickness of part B, C and D is about 1-4mm.

The specific height of the pressing structure 2 needs to be adjusted according to the specific conditions of the thrust bearing, and its height cannot affect the upward movement of the thrust head when the top rotor is moved.

The use of the present invention is described below in conjunction with specific embodiments:

Example 1

The oil mist overflow problem of the thrust bearing of the high-speed hydro-generator set of a hydropower plant is serious. The structure of the original anti-oil mist device of the thrust bearing is shown in Figure 5. The thrust head 6 rotates at a high speed, and the pressure plate 13 and the bearing cover 1 are connected by bolts 3 At the same time, there is a gap of about 0.5mm between the pressure plate 13 and the thrust head 6, and the oil mist escapes through the gap, resulting in oil pollution on the entire plant floor and the cabinet. The oil mist causes the stator bars, leads, rotor magnetic poles and wheel spokes. Pollution, combined with dust, turns into impurities to block the ventilation holes, resulting in poor ventilation and heat dissipation of the generator, increasing the temperature of the stator coil, posing a threat to the safety and stability of the unit, and causing pollution to the environment. These oil mist and dust are long-term on the equipment. The adhesion of the slip ring is corrosive to a certain extent, which causes the insulation of the wire rod to age, and the performance decreases. Too much oil mist of the slip ring causes serious ignition. The viscosity of the oil mist makes cleaning difficult and increases the labor intensity of maintenance.

Investigating the reason, it is found that the anti-oil mist effect of the thrust bearing anti-oil mist device is not ideal. In view of the above situation, in order to overcome the defects of the prior art, the device of the present invention can effectively solve the problem of oil mist overflow of the thrust bearing, and the cost is low and the structure is low. Simple, convenient and quick replacement, to ensure the safe operation of the hydro turbine unit.

After using the device of the invention for more than half a year, the oil mist overflowing from the thrust bearing has been significantly reduced, thereby reducing the oil pollution on the plant floor and the panel cabinet, reducing the pollution to the stator bars, leads, rotor magnetic poles and wheel spokes, effectively preventing oil mist and The combination of dust becomes impurities and blocks the ventilation holes, which ensures the normal ventilation and heat dissipation of the generator and the normal temperature of the stator coil, which ensures the safe and stable operation of the unit. And the problem of performance degradation, preventing the sparking phenomenon caused by too much oil mist of the slip ring, making cleaning more convenient, reducing the labor intensity of engine repair and maintenance, and proving that the device of the invention has a good anti-oil mist effect.

The invention can effectively solve the problem of oil mist overflow of the high-speed thrust bearing, and has simple structure, convenient and fast installation, and the oil mist collector can be replaced after being used for a certain period of time. Small and medium-sized high-speed generator thrust bearings have a wide range of applications, are easy to produce, promote and apply, and have great environmental protection and economic benefits.

Claims (7)

1. A thrust bearing oil mist overflow preventing device of a high-speed generator comprises a compression structure and an oil mist collector, and is characterized in that the compression structure (2) is connected with a bearing cover (1) through a bolt (3), the left, right and upper wall surfaces of an inner cavity (7) of the compression structure (2) are respectively provided with the oil mist collector, a first heavy oil mist collector (8) is arranged in the cavity (7) and close to one side of the bearing cover (1), one side of the first heavy oil mist collector is tightly contacted with the inner side wall of the cavity (7), the other side of the first heavy oil mist collector is tightly contacted with a second heavy oil mist collector (9), the first heavy oil mist collector plays a role in sealing and can collect thrown oil mist, the second heavy oil mist collector (9) is arranged above the contact part of the bearing cover (1) and a thrust head (6), the end surface gap between the second heavy oil mist collector and the thrust head (6) is 10-20 threads, and the third heavy oil mist collector (10, the fourth oil mist collector (11) is arranged in the cavity (7) and close to the upper part of the thrust collar (6) and is tightly attached to the inner side wall of the cavity (7), and the gap between the fourth oil mist collector and the end face of the thrust collar (6) is 10-20 threads.

2. The high-speed generator thrust bearing oil mist overflow preventing device is characterized in that the first heavy oil mist collector (8) is directly adhered to the inner side wall of the cavity (7), the second heavy oil mist collector (9) is directly adhered to the first heavy oil mist collector (8) and then tightly pressed against the inner wall of the cavity (7) of the compact structure (2) through a transverse bolt (5), the third heavy oil mist collector (10) is adhered to the top surface of the cavity (7), the thickness of the third heavy oil mist collector (10) is matched with the distance from the bolt (5) to the top surface of the cavity (7), and the fourth heavy oil mist collector (11) is fastened to the compact structure (2) through a nut (4) and the bolt (5).

3. The oil mist spill preventing device for the thrust bearing of the high-speed generator as claimed in claim 1, wherein the oil mist collector is a circular ring made of industrial felt or high-temperature-resistant oil-absorbing material.

4. The high-speed generator thrust bearing oil mist overflow preventing device as claimed in claim 1, characterized in that the compressing structure (2) is composed of A, B, C, D four parts, and the compressing structure (2) is a whole cast or welded by the four parts.

5. The oil mist overflow preventing device for the thrust bearing of the high-speed generator as claimed in claim 4, wherein each part of the compacting structure (2) is made of iron, stainless steel, aluminum alloy or copper.

6. The high speed generator thrust bearing oil mist spill prevention device as claimed in claim 4, wherein the compacting structure (2) is a circular plate in both parts A and C, and cylindrical in both parts B and D.

7. The high-speed generator thrust bearing oil mist overflow preventing device is characterized in that the thickness of the part A of the compaction structure (2) is 2-8mm, and the thickness of the parts B, C and D is 1-4 mm.

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