A device for preventing oil mist overflow from thrust bearing of high-speed generator

Abstract

The invention relates to an oil mist overflow prevention device for a thrust bearing of a high-speed generator, which can effectively solve the problem of oil mist overflow of the thrust bearing. The technical solution is that a clamping structure is connected to a bearing cover by bolts, and the left, right and upper walls of an internal cavity of the clamping structure are all equipped with oil mist collectors. A first-weight oil mist collector is placed in the cavity close to the bearing cover, one side of which is in close contact with the inner wall of the cavity, and the other side is in close contact with a second-weight oil mist collector, which not only plays a sealing role but also can collect the oil mist thrown out. The second-weight oil mist collector is placed above the contact point between the bearing cover and the thrust head, and the third-weight oil mist collector is placed on the top surface of the cavity and is in close contact with the top surface. The invention has a simple structure, is convenient and quick to replace, and has a low cost, can meet the safe operation requirements of the unit, and is an innovation in the oil mist overflow prevention device for the thrust bearing of a high-speed generator.

Description

Technical Field

[0001] The invention relates to the field of thrust bearings for generators, in particular to an oil mist overflow prevention device for thrust bearings for high-speed generators. Background Art

[0002] When the generator is running at a high speed, 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 collision 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 and generate more oil mist; after the oil mist gathers to a certain extent, it will burst out 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 overflowing oil mist causes the factory floor and cabinets to be oily; the oil mist will also cause pollution to the stator wire rods, leads, rotor poles and rotor spokes. (2) Threaten the safe operation of the unit: too much oil mist attached to the slip ring will cause sparking; the combination of oil mist and dust will block the ventilation holes, resulting in poor ventilation and heat dissipation performance of the generator, thereby causing the temperature of the stator coil to rise, posing 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, causing the insulation of the wire rods to age and performance to decline. (3) Increase the workload of maintenance personnel: The sticky oil mist adhering to the ground and cabinets will make cleaning difficult, increasing the workload of maintenance personnel. Therefore, it is imperative to invent a device to prevent oil mist overflow from the thrust bearing of a high-speed generator. Summary of the invention

[0003] 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 oil mist overflow prevention device, which can effectively solve the problem of thrust bearing oil mist overflow.

[0004] The technical solution solved by the present invention is to include a clamping structure and an oil mist collector. The clamping structure is connected to the bearing cover by bolts. The left, right and upper walls of the internal cavity of the clamping structure are equipped with oil mist collectors. The first heavy oil mist collector is placed in the cavity close to the bearing cover, one side of which is in close contact with the inner 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 can collect the oil mist thrown out. The second heavy oil mist collector is placed above the contact point between the bearing cover and the thrust head, and the end face gap between it and the thrust head is 10-20 threads. The third heavy oil mist collector is placed on the top surface of the cavity and is tightly attached 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 tightly attached to the inner wall of the cavity, and the gap between it and the end face of the thrust head is 10-20 threads.

[0005] The invention has a simple structure, is convenient and quick to replace, has a low cost, can meet the safe operation requirements of the unit, and is an innovation in the oil mist overflow prevention device for the thrust bearing of a high-speed generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a top view of the structure of the present invention.

[0007] Figure 2 For the present invention Figure 1 AA section view.

[0008] Figure 3 The figure is a schematic diagram of the position of the structure of the present invention in the generator bearing.

[0009] Figure 4 It is a schematic diagram of the compression structure of the present invention.

[0010] Figure 5 This is a schematic diagram of the oil mist prevention device of Example 1 of the present invention before modification. DETAILED DESCRIPTION

[0011] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0012] Depend on Figure 1-4 It is given that the present invention includes a clamping structure and an oil mist collector, the clamping structure 2 is connected to the bearing cover 1 by bolts 3, the left, right and upper walls of the internal cavity 7 of the clamping structure 2 are equipped with oil mist collectors, the first heavy oil mist collector 8 is placed in the cavity 7 close to the bearing cover 1, one side of which is in close contact with the inner wall of the cavity 7, and the other side is in close contact with the second heavy oil mist collector 9, which not only plays a sealing role, but also can collect the oil mist thrown out, the second heavy oil mist collector 9 is placed above the contact point between the bearing cover 1 and the thrust head 6, and the end face gap 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 tightly attached to the top surface, the fourth heavy oil mist collector 11 is placed in the cavity 7 close to the top of the thrust head 6 and is tightly attached to the inner wall of the cavity 7, and the gap with the end face of the thrust head 6 is 10-20 wires (1 wire is equal to 0.01mm).

[0013] In order to ensure the use effect, the first heavy oil mist collector 8 is directly glued to the inner wall of the cavity 7, the second heavy oil mist collector 9 is directly glued to the first heavy oil mist collector 8, and then tightened to the inner wall of the cavity 7 of the clamping structure 2 through the transverse bolts 5, and the third heavy oil mist collector 10 is glued to the top surface of the cavity 7. At the same time, the bolts 5 will also support the third heavy oil mist collector 10. The thickness of the third heavy oil mist collector 10 is preferably such that the bolts 5 used for support below can clamp it on the top of the clamping structure 2. The fourth heavy oil mist collector 11 is fastened (a term in the mechanical industry, referring to the planes of two objects being connected together with bolts) to the clamping structure 2 through nuts 4 and bolts 5.

[0014] The oil mist collector is a circular ring made of industrial felt or high temperature resistant oil absorption material; 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 against the bearing end face and the thrust head end face.

[0015] The clamping structure 2 is composed of four parts, A, B, C, and D. The clamping structure 2 can be cast as a whole or welded from four parts, wherein parts A and C are both annular, parts B and D are both cylindrical, and the materials of each part can be iron, stainless steel, aluminum alloy, copper or other metal materials. The thickness of the four parts needs to be determined according to actual conditions. The thickness of part A is about 2-8mm, and the thickness of parts B, C and D are about 1-4mm.

[0016] The specific height of the clamping structure 2 needs to be adjusted according to the specific situation of the thrust bearing, and its height cannot affect the upward movement of the thrust head when the rotor is pushed up.

[0017] The following describes the use of the present invention in conjunction with specific embodiments:

[0018] Example 1

[0019] The thrust bearing of a high-speed turbine generator set in a hydropower plant has a serious oil mist overflow problem. The original anti-oil mist device structure of the thrust bearing is as follows: Figure 5 As shown, the thrust head 6 rotates at a high speed, and the pressure plate 13 and the bearing cover 1 are connected together by bolts 3. There is a gap of about 0.5 mm between the pressure plate 13 and the thrust head 6. The oil mist escapes through the gap, causing the entire factory floor and cabinets to be oily. The oil mist causes contamination of the stator wire rods, leads, rotor poles and wheel spokes, and combines with dust to become impurities that block the ventilation holes, causing poor ventilation and heat dissipation of the generator, and the temperature of the stator coil increases, posing a threat to the safety and stability of the unit, and polluting the environment. The long-term attachment of these oil mists and dust to the equipment has a certain degree of corrosiveness, causing aging of the wire rod insulation and reduced performance. Too much oil mist on the slip ring causes serious sparking. The viscosity of the oil mist makes cleaning difficult, increasing the labor intensity of inspection and maintenance.

[0020] After investigating the reason, it was found that the anti-oil mist effect of the thrust bearing anti-oil mist device was 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 thrust bearing oil mist overflow, and it has low cost, simple structure, convenient and quick replacement, and ensures the safe operation of the turbine unit.

[0021] In the more than half a year since the use of the device of the present invention, the oil mist overflowing from the thrust bearing has been significantly reduced, thereby reducing the oil pollution on the factory floor and cabinets, reducing the pollution to the stator wire rods, lead wires, rotor poles and wheel spokes, and effectively preventing the oil mist from combining with dust to become impurities to block the ventilation holes, ensuring normal ventilation and heat dissipation of the generator, maintaining the normal temperature of the stator coil, and ensuring the safe and stable operation of the unit. At the same time, it effectively solves the problem of wire rod insulation aging and performance degradation caused by long-term adhesion of oil mist and dust to the equipment, prevents sparking caused by too much oil mist on the slip ring, makes cleaning more convenient, and reduces the labor intensity of generator inspection and maintenance, proving that the device of the present invention has a good anti-oil mist effect.

[0022] The present invention can effectively solve the problem of oil mist overflow in high-speed thrust bearings. It has a simple structure and is easy and quick to install. The oil mist collector can be replaced after a certain period of use. The replacement is convenient and quick, which greatly reduces the oil mist-related processing costs. The present invention is suitable for large, medium and small high-speed generator thrust bearings, has a wide range of applications, is easy to produce and promote, and has huge environmental and economic benefits.

Claims

1. A device for preventing oil mist from overflowing from a thrust bearing of a high-speed generator, comprising a pressing structure and an oil mist collector, characterized in that: The clamping structure (2) and the bearing cover (1) are connected together by bolts (3). The left, right and upper walls of the internal cavity (7) of the clamping structure (2) are all equipped with oil mist collectors. The first heavy oil mist collector (8) is placed in the cavity (7) close to the bearing cover (1). One side of the first heavy oil mist collector is in close contact with the inner wall of the cavity (7), and the other side is in close contact with the second heavy oil mist collector (9). It not only plays a sealing role, but also can collect the thrown oil mist. The second heavy oil mist collector (9) is placed above the contact point between the bearing cover (1) and the thrust head (6), and the gap between it and the end face of the thrust head (6) is 10-20 mm. The third oil mist collector (10) is placed on the top surface of the cavity (7) and is in close contact with the top surface. The fourth oil mist collector (11) is placed in the cavity (7) near the top of the thrust head (6) and is in close contact with the inner wall of the cavity (7), and the gap between it and the end face of the thrust head (6) is 10-20 mm. The clamping structure (2) The invention is composed of four parts, A, B, C and D. Part A and part C are both annular plates, and part B and part D are both cylindrical. The clamping structure (2) is cast as a whole or welded from four parts. The first heavy oil mist collector (8) is directly adhered to the inner 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 pressed against the inner wall of the cavity (7) of the clamping structure (2) through transverse bolts (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) matches the distance from the bolt (5) to the top surface of the cavity (7). The fourth heavy oil mist collector (11) is fastened to the clamping structure (2) through nuts (4) and bolts (5).

2. The high-speed generator thrust bearing oil mist overflow prevention device according to claim 1, characterized in that: The oil mist collector is in the shape of a ring and is made of industrial felt or high temperature resistant oil absorbing material.

3. The high-speed generator thrust bearing oil mist overflow prevention device according to claim 1, characterized in that: The various parts of the clamping structure (2) are made of iron, stainless steel, aluminum alloy or copper.

4. The high-speed generator thrust bearing oil mist overflow prevention device according to claim 1, characterized in that: The thickness of part A of the compression structure (2) is 2-8 mm, and the thickness of parts B, C and D are 1-4 mm.

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