Oil leakage prevention combined structure of end cover type bearing generator

Abstract

The utility model provides an end cover type bearing generator oil leakage prevention combination structure which is used for preventing generator end cover type bearing oil leakage, a main shaft and a bearing are arranged in a generator bearing box, the bearing is sleeved on the main shaft, the bearing is connected with the bearing box, the bearing is arranged on one side of the main shaft far away from a generator, and the main shaft is connected with the bearing box. A cooling fan is arranged on the side, close to a generator, of the main shaft, the oil leakage prevention combined structure comprises a bearing body oil baffle, the bearing body oil baffle comprises a supporting frame and a bearing oil baffle tooth assembly, the main shaft is sleeved with the supporting frame, one end of the supporting frame is attached to the bearing, the bearing oil baffle tooth assembly is arranged on the inner side of the supporting frame, and the bearing oil baffle tooth assembly is arranged on the outer side of the supporting frame. The lubricating oil leakage prevention device is used for preventing lubricating oil from leaking from the side, away from the generator, of the bearing to the side close to the generator.

Description

Technical Field

[0001] The utility model relates to the field of end - cover type bearing generators, in particular to an anti - oil - leakage combined structure for an end - cover type bearing generator. Background Art

[0002] Generator equipment is one of the most important equipment in power plants. Steam, gas or other working media impulse the prime mover to drive the generator rotor to rotate and generate electricity, which is an indispensable link for power plants to convert mechanical energy into electrical energy. Conventional generators usually adopt a split - type bearing support structure, and the bearing box is independent of the generator body. In recent years, with the development of the waste - to - energy power generation industry, generator manufacturers have considered the actual problems of tight project land use and small turbine hall size, and further considered reducing equipment costs. End - cover type bearing structure generators are used in some power plants. The main difference between this type of generator and the independent - support bearing generator is that its front and rear bearings are half - wrapped inside the generator end - cover.

[0003] During the operation of the unit, due to factors such as high inlet oil pressure, large oil volume, unsmooth bearing oil return, excessive installation clearance of the oil baffle, and wear - out failure of the oil baffle in the generator bearing, the lubricating oil of the generator bearing will leak from the bearing box end - cover. If a traditional independent - support bearing generator is used, the oil leakage drips on the external platform area of the equipment, and power plant workers can detect and clean the oil stain in time during the inspection, and the risk of power accidents such as fire and explosion is relatively small. Its fault elimination can be carried out during the minor repair of the generating unit. The fault is handled by re - checking and adjusting the oil baffle clearance, replacing the worn - out oil baffle, and cleaning the oil return hole, etc., and the difficulty of defect elimination is relatively small.

[0004] For the generator designed with an end - cover type bearing, because half of its bearing structure is wrapped inside the generator end - cover and is in the air - inlet area of the generator cooling fan. When the generator cooling fan runs, a negative pressure is formed at the fan inlet, and the sealing effect of the generator bearing sealing teeth is greatly reduced under the action of the suction force. Oil mist and oil droplets enter the generator body along with the generator cooling air, adhere to the surfaces of the generator stator and rotor, and dust and flocculent sundries in the air are easily adsorbed on the oil stain surface, resulting in a decrease in the insulation of the generator. In severe cases, insulation breakdown may occur, leading to a major short - circuit accident. Its unique integrated structure of the end - cover type bearing generator increases the difficulty of treating bearing box oil leakage. Enterprises in the industry have adopted various oil - leakage treatment measures, but the treatment effect is not good. The equipment runs with diseases for a long time, posing a great safety hazard. Content of the Utility Model

[0005] To solve the problems existing in the prior art, the present utility model proposes a combined anti-oil-leakage structure for an end-cover type bearing generator, which can greatly slow down or even eliminate the oil leakage defect inside the generator only by installing this combined anti-oil-leakage structure during the minor repair of the unit, without the need to replace the entire generator or disassemble and overhaul the steam turbine generator set.

[0006] To achieve the above object, the present utility model adopts the following scheme:

[0007] The present utility model provides a combined anti-oil-leakage structure for an end-cover type bearing generator, which is used to prevent oil leakage from the end-cover type bearing of the generator. There is a main shaft and a bearing in the generator bearing box. The bearing is sleeved on the main shaft, and the bearing is connected to the bearing box. The bearing is arranged on the side of the main shaft far from the generator, and a cooling fan is arranged on the side of the main shaft close to the generator. The combined anti-oil-leakage structure includes:

[0008] An oil baffle for the bearing body, including a support frame and a bearing oil baffle tooth assembly. The support frame is sleeved on the main shaft, one end of which is in contact with the bearing, and the bearing oil baffle tooth assembly is arranged on the inner side of the support frame to prevent lubricating oil from leaking from the side of the bearing far from the generator to the side close to the generator.

[0009] Further, it further includes:

[0010] An end-cover oil baffle assembly, including a high-pressure gas chamber and an outer oil baffle tooth assembly on the side close to the generator. Among them, the inner side wall of the high-pressure gas chamber is close to the main shaft, and a circumferential gap is opened thereon. After the high-pressure gas passes through the circumferential gap from the high-pressure gas chamber, it jets out along the outer surface of the main shaft in both directions away from and close to the generator; an outer oil baffle tooth assembly is arranged on the surface of the inner side wall of the high-pressure gas chamber facing the main shaft.

[0011] Further, the outer oil baffle tooth assembly includes a first sub-oil baffle tooth assembly and a second sub-oil baffle tooth assembly, which are respectively arranged on both sides of the circumferential gap.

[0012] Further, a pipeline for introducing high-pressure gas is arranged on the high-pressure gas chamber, and the pipeline for introducing high-pressure gas is connected to a compressed air source or the air outlet of the generator cooling fan.

[0013] Further, it further includes a wind blocking cover, which is fixed on the end face of the end-cover oil baffle assembly on the side close to the generator. After reserving the axial movement clearance of the rotor, the cover extends axially and is close to the end face of the cooling fan hub.

[0014] Further, the end cover oil baffle assembly further includes an atmospheric balance chamber and an inner oil baffle tooth assembly on the side away from the generator. The atmospheric balance chamber and the high-pressure gas chamber are arranged in sequence along the axial direction of the main shaft. The atmospheric balance chamber is communicated with the atmosphere through an atmospheric balance pipe. Part of the high-pressure gas ejected in the direction away from the generator flows out of the end cover oil baffle assembly into the bearing box after passing through the atmospheric balance chamber. The inner oil baffle tooth assembly is arranged on the inner surface of the end wall of the end cover oil baffle assembly away from the generator close to the main shaft.

[0015] Further, a filter screen is arranged at the outer pipe orifice of the atmospheric balance pipe.

[0016] Further, the atmospheric balance pipe is connected to a pressure detection device for detecting and adjusting the airtight effect of the high-pressure gas.

[0017] Further, the bearing body oil baffle is connected to the end cover oil baffle assembly or the bearing. When connected to the end cover oil baffle assembly, an insulating pad is arranged on the joint surface between the end cover oil baffle assembly and the bearing box.

[0018] Further, a connecting pipe is arranged on the upper cover of the bearing box, which is connected to a turbine fan to suck the oil fume from the bearing box into the main lubricating oil tank.

[0019] The beneficial effects of the present utility model are as follows:

[0020] The present utility model provides a combined structure for preventing oil leakage of an end cover type bearing generator. The bearing body oil baffle is closely attached to the bearing body for installation. The oil baffle teeth prevent the oil flow from being ejected into oil fume and oil mist, reducing the possibility of escaping to the inner oil baffle of the new end cover and slowing down the oil leakage defect inside the generator.

[0021] In some embodiments, the end cover oil baffle assembly is fixed on the side end cover of the bearing box unidirectionally. The high-pressure air introduced into the high-pressure gas chamber is used to blow back and purge the oil leakage from the bearing clearance in the seal, and at the same time weaken the negative pressure suction force of the generator cooling fan, further slowing down the oil leakage problem.

[0022] In some embodiments, when the airtight effect of the high-pressure gas is not good, the atmospheric balance chamber compensates part of the air from the atmosphere to prevent the lubricating oil in the bearing box from being sucked and leaked, and provides a judgment basis for adjusting the high-pressure gas. By adjusting the high-pressure gas flow rate, slight air leakage occurs at the connection pipe of the atmospheric balance chamber to ensure the airtight effect of the combined structure of the present utility model.

[0023] In some embodiments, through the wind blocking cover, by restricting the entrainment space of the entrained gas, the negative pressure entrainment effect of the cooling fan is greatly weakened. Description of the Drawings

[0024] Figure 1 It is a structural diagram of an existing end cover oil baffle.

[0025] Figure 2 It is a schematic diagram of the installation of the existing end cover oil baffle.

[0026] Figure 3 It is the front view of the existing end cover oil baffle.

[0027] Figure 4 It is the left view of the existing end cover oil baffle.

[0028] Figure 5 It is the top view of the existing end cover oil baffle.

[0029] Figures 6 - 10 It is the three-dimensional schematic diagram of the overall structure in the embodiment of the present utility model.

[0030] Figure 11 It is the front view of the structure in the embodiment of the present utility model.

[0031] Figure 12 It is the left view of the structure in the embodiment of the present utility model.

[0032] Figure 13 It is the top view of the structure in the embodiment of the present utility model.

[0033] Figure 14 It is the schematic diagram of the embodiment of the present utility model in a compact structure.

[0034] Figure 15 It is the partial enlarged schematic diagram of the embodiment of the present utility model.

[0035] In the figure,

[0036] 1. End cover oil baffle body; 101 Upper half of end cover oil baffle body; 102 Lower half of end cover oil baffle body; 2. Inner oil baffle teeth; 201 Upper half of inner oil baffle teeth; 202 Lower half of inner oil baffle teeth; 3. Inner oil baffle oil drain port; 4. Outer oil baffle oil drain port; 5. Outer oil baffle teeth; 501 Upper half of outer oil baffle teeth; 502 Lower half of outer oil baffle teeth; 6. Body fastener; 7. Bearing body oil baffle; 701 Upper half of bearing body oil baffle; 702 Lower half of bearing body oil baffle; 8. Bearing body oil baffle teeth; 801 Upper half of bearing body oil baffle teeth; 802 Lower half of bearing body oil baffle teeth; 9. Bearing body oil baffle fastener; 10. End cover oil baffle assembly body; 1001 Upper half of end cover oil baffle assembly body; 1002 Lower half of end cover oil baffle assembly body; 11. Inner oil baffle teeth of end cover oil baffle assembly; 1101 Upper half of inner oil baffle teeth of end cover oil baffle assembly; 1102 Lower half of inner oil baffle teeth of end cover oil baffle assembly; 12. Atmosphere balance chamber; 13. Atmosphere balance chamber connecting pipe; 14. High-pressure gas chamber; 15. High-pressure gas connecting pipe; 16. Outer oil baffle teeth of end cover oil baffle assembly; 1601 Upper half of outer oil baffle teeth of end cover oil baffle assembly; 1602 Lower half of outer oil baffle teeth of end cover oil baffle assembly; 17. Wind blocking cover; 1701 Upper half of wind blocking cover; 1702 Lower half of wind blocking cover; 18. End cover oil baffle assembly fastener; 19. Wind blocking cover fastener; 20. Inner oil baffle teeth oil drain hole of end cover oil baffle assembly; 21. Atmosphere balance chamber oil drain hole; 22. Insulating pad; 23. Circumferential clearance. Detailed implementation manners

[0037] To make the technical solutions and advantages of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be fully described below in conjunction with the drawings in the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0038] The anti-oil leakage combined structure of the end cover type bearing generator of the present utility model mainly consists of a bearing body oil baffle, an end cover oil baffle assembly, and a wind blocking cover.

[0039] In the present utility model, the bearing body oil baffle mainly consists of a support frame and oil baffle teeth. Its feature is that, compared with the traditional bearing box oil baffle, the distance from the oil leakage part of the bearing body is relatively far, resulting in the oil leakage from the radial clearance between the bearing and the main shaft being sprayed onto the outer oil baffle or in the air, atomized into oil mist and oil droplets, increasing the possibility of leakage. When installing the bearing body oil baffle of the present utility model, it is first necessary to drill holes on both end faces of the bearing body and tightly fix it on both end faces of the bearing through fastening bolts. The oil liquid before divergence and atomization is blocked by several oil baffle teeth, greatly reducing the oil leakage amount from the radial clearance between the bearing and the main shaft, and avoiding the formation of a large amount of oil mist and oil fume.

[0040] Different from the existing structure, the existing oil baffle is usually set on the end cover of the bearing box, while the oil baffle of the utility model is directly attached to the bearing body. Through the oil baffle tooth seal, the lubricating oil that may have leaked is forced to return to the bottom of the bearing box through the oil return port, which can prevent the oil from diffusing and atomizing, and fundamentally suppress the generation of oil smoke and oil mist.

[0041] Preferably, Figure 14 If the bearing box is small in size and the axial distance between the bearing body and the end cover oil baffle is close, the bearing body oil baffle and the end cover oil baffle assembly can be placed close to one side of the generator bearing shell, that is, an integrated combination design, which can reduce the workload of on-site bearing body drilling. It should be noted that when the bearing body oil baffle and the end cover oil baffle assembly are integrated, an insulating pad 22 should be set on the joint surface of the end cover oil baffle and the bearing box.

[0042] Preferably, a hole is opened on the upper cover of the bearing box cover and a pipe is welded to connect a low-power turbine fan to suck the remaining small amount of oil smoke from the bearing box back into the main lubricating oil tank, thereby further achieving the effect of controlling the escape of oil smoke.

[0043] In the utility model, the end cover oil baffle assembly is mainly composed of a high-pressure gas chamber, an atmospheric balance chamber, inner oil baffle teeth of the end cover oil baffle assembly and outer oil baffle teeth of the end cover oil baffle assembly.

[0044] The high-pressure gas chamber mainly introduces high-pressure gas through an external pipeline, and is sprayed into the outer oil baffle tooth area of ​​the end cover oil baffle assembly through a full circle of 2-3mm wide circumferential gap 23, and flows in two directions axially along the main shaft of the generator. One direction is to sweep toward the generator bearing side, and the seeped oil reaching the inner oil baffle tooth area of ​​the end cover oil baffle assembly is reversely swept back to the bearing box; the other direction is to spray toward the generator body side to balance the negative pressure effect of the generator cooling fan.

[0045] Preferably, the high-pressure gas can be compressed air, or the air at the generator cooling fan outlet can be used. During the generator set design stage, a high-pressure gas pipeline can be drawn out of the generator cooling fan outlet air chamber and directly connected to the high-pressure gas inlet pipe of the utility model to reduce the compressed air consumption in the plant.

[0046] The atmospheric balance chamber is connected to the atmospheric side through a pipeline. During the normal operation of the generator set, the pipeline slightly exhausts to the atmospheric environment, playing a role in balancing the pressures of the bearing box and the high-pressure gas chamber, and can reflect the airtight effect of the high-pressure gas. If the high-pressure gas flow or pressure is insufficient, the suction force formed by the rotation of the generator cooling fan cannot be broken, and this area will draw in some air from the atmosphere to prevent a large amount of oil mist and fume from being directly sucked into the generator by negative pressure, playing a certain buffering role. A pressure detection device can be connected to the atmospheric pipeline of the bearing box. When the pressure shows negative pressure, the intake of the high-pressure gas flow can be adjusted. Different from the existing structure, an atmospheric balance chamber is established between the high-pressure gas area and the inner area of the bearing box. As an effective buffer zone, it can further reduce the influence of the negative pressure suction force of the cooling fan on the bearing box. During normal operation, by testing the state of inhaling or exhausting air inward through the exhaust port, the opening degree of the high-pressure gas can be adjusted in time to judge the working effectiveness of the end cover oil baffle assembly. Due to the possibility of inhaling air inward, a stainless steel metal filter screen should be installed at the atmospheric interface of the bearing box upper cover.

[0047] The wind blocking cover of the anti-oil leakage combined structure of the end cover type bearing generator is fixed on the end face of the end cover oil baffle assembly close to the generator body side by flange bolts. On the premise of leaving a rotor axial movement gap, the shield extends axially as close as possible to the end face of the cooling fan hub.

[0048] Different from the existing structure, in the existing structure of the end cover type bearing generator, the outer oil baffle area of the bearing box is completely exposed in the negative pressure area of the cooling fan air inlet, resulting in the lubricating oil inside the bearing box being easily leaked to the generator body due to the negative pressure suction effect. The wind blocking cover of the present utility model establishes a barrier in the negative pressure area, and the negative pressure suction gradually decays in the narrow static and dynamic gap in the length direction of the wind blocking cover, suppressing the suction effect on the oil mist and fume of the bearing box.

[0049] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0050] Figures 1 - 5 As the existing end cover oil baffle structure, as shown in the figure, the existing end cover oil baffle structure mainly consists of an end cover oil baffle body 1, an inner oil baffle tooth 2, an outer oil baffle tooth 5, an inner oil baffle oil drain port 3, and an outer oil baffle oil drain port 4, and is fixed by a body fastener 6. Among them, the end cover oil baffle body 1 consists of an upper half 101 of the end cover oil baffle body and a lower half 102 of the end cover oil baffle body, the inner oil baffle tooth 2 consists of an upper half 201 of the inner oil baffle tooth and a lower half 202 of the inner oil baffle tooth, and the outer oil baffle tooth 5 consists of an upper half 501 of the outer oil baffle tooth and a lower half 502 of the outer oil baffle tooth.

[0051] The working principle of the existing end cover oil baffle: The inner and outer oil baffle teeth are fixedly installed in the oil baffle groove of the end cover oil baffle body along the circumferential direction of the generator main shaft. There is a small radial clearance between the tips of the oil baffle teeth and the generator main shaft. Through the multi-stage throttling effect, it prevents the leakage of lubricating oil and at the same time prevents foreign objects from entering the bearing interior to contaminate the lubricating oil.

[0052] In the generator bearing box with an end cover type bearing design, half of the bearing box is wrapped inside the generator end cover. The oil baffle area of the bearing is affected by the negative pressure entrainment on the side of the generator cooling fan, resulting in a poor oil baffle sealing effect; when the installation quality of the oil baffle is poor or the oil baffle teeth are worn during the start-stop and operation of the unit, it will cause an increase in the radial clearance, and the leakage of lubricating oil through the existing end cover oil baffle to the generator body will increase significantly, and the operating safety factor of the generator will continue to decrease.

[0053] Figures 6 - 15 As shown in the structural schematic diagram of the present utility model, in this example, a combined anti-oil leakage structure for a generator with an end cover type bearing mainly consists of an oil baffle 7 of the bearing body, an inner oil baffle tooth 11 of the end cover oil baffle assembly, an atmospheric balance chamber 12, a high-pressure gas chamber 14, an outer oil baffle tooth 16 of the end cover oil baffle assembly, and a wind blocking cover 17. They are all composed of upper and lower parts, namely the upper half 701 and the lower half 702 of the oil baffle of the bearing body; the upper half 1101 and the lower half 1102 of the inner oil baffle tooth of the end cover oil baffle assembly; the upper half 1601 and the lower half 1602 of the outer oil baffle tooth of the end cover oil baffle assembly; the upper half 1701 and the lower half 1702 of the wind blocking cover. The oil baffle 7 of the bearing body is directly fixed on the generator bearing body through the fasteners 9 of the oil baffle of the bearing body; the body 10 of the end cover oil baffle assembly is installed on the end cover on the side of the bearing box close to the generator through the fasteners 18 of the end cover oil baffle; the wind blocking cover 17 is fixed on the end face on the side of the body 10 of the end cover oil baffle assembly close to the generator through the fasteners 19 of the wind blocking cover.

[0054] The oil baffle 7 of the bearing body is divided into upper and lower halves, radially symmetrically arranged on both sides of the generator main shaft. An oil baffle tooth 8 of the bearing body is installed on the oil baffle 7 of the bearing body, which is composed of the upper half 801 and the lower half 802 of the oil baffle tooth of the bearing body. The oil leakage from the radial clearance of the generator main shaft is intercepted by the multi-channel copper tooth oil seals installed on the oil baffle tooth 8 of the bearing body for the first time, and the jet volume of the high-pressure oil flow leaking from the radial clearance between the generator main shaft and the bearing is greatly reduced, and the generation of oil fume and oil mist in the bearing box is suppressed.

[0055] The end cover oil baffle assembly body 10 is installed with the inner oil baffle teeth 11 of the end cover oil baffle assembly to prevent the oil leakage at the oil baffle 7 of the bearing body from leaking outside the bearing box; the end cover oil baffle assembly body 10 is composed of the upper half 1001 of the end cover oil baffle assembly body and the lower half 1002 of the end cover oil baffle assembly body, and a high-pressure gas chamber 14 is provided. High-pressure gas enters the high-pressure gas chamber 14 through the high-pressure gas connection pipe 15 and is sprayed into the area of the outer oil baffle teeth 16 of the end cover oil baffle assembly through the annular gap of the high-pressure gas chamber, flowing in the left and right axial directions of the generator body and the bearing box respectively to form a high-pressure gas curtain, weakening the negative pressure entrainment effect of the generator cooling fan, and at the same time blowing the oil leakage of the generator bearing back into the bearing box reversely. The atmosphere balance chamber 12 plays a role in buffering and balancing the air pressure. During the operation of the unit, it is necessary to adjust an appropriate flow rate of the high-pressure air entering the high-pressure gas chamber 14. Insufficient flow rate may lead to poor high-pressure gas sealing effect, and excessive flow rate may lead to waste of electricity. When there is a slight air leakage in the atmosphere balance chamber 12, it indicates that the area of the inner oil baffle teeth 11 of the end cover oil baffle assembly is under positive pressure, and it is judged that the high-pressure gas sealing effect is good. A drain hole 20 for the inner oil baffle teeth of the end cover oil baffle assembly is provided below the inner oil baffle teeth 11 of the end cover oil baffle assembly, and a drain hole 21 for the atmosphere balance chamber is provided at the bottom of the atmosphere balance chamber 12. The oil leakage intercepted by the oil baffle seal returns to the bottom of the bearing box through the drain hole 20 for the inner oil baffle teeth of the end cover oil baffle assembly and the drain hole 21 for the atmosphere balance chamber and follows the return oil pipe back to the unit oil tank.

[0056] The wind blocking cover 19 is fixed on the end face of the end cover oil baffle assembly body 10 on the side close to the generator through the wind blocking cover fastener 19. The wind blocking cover covers the generator shaft, leaving an appropriate radial dynamic and static clearance, and the axial length extends to the area of the generator cooling fan hub. A clearance for the axial movement of the generator shaft is left between the edge of the wind blocking cover and the surface of the cooling fan hub. The negative pressure entrainment force formed by the rotation of the generator cooling fan continuously decays in the narrow space between the wind blocking cover and the shaft, reducing the suction effect on the oil mist and oil fume in the bearing box.

[0057] In the description of this specification, reference terms such as "one embodiment" and "example" mean that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the relative embodiments or examples and are combined in a suitable manner.

[0058] It must be pointed out that the description of the above embodiments is not for limitation but only for helping to understand the core idea of the present invention. For those of ordinary skill in the art in this technical field, any improvements made to the present invention and equivalent alternative solutions to this product without departing from the principle of the present invention also fall within the protection scope of the claims of the present invention.

Claims

1. An end cover bearing generator oil leakage prevention combined structure, used to prevent the generator end cover bearing from leaking oil, the generator bearing box has a main shaft and a bearing, the bearing sleeve is arranged on the main shaft, the bearing is connected to the bearing box, the bearing is arranged on the side of the main shaft away from the generator, and a cooling fan is arranged on the side of the main shaft close to the generator, characterized in that: The oil leakage prevention combined structure comprises: The bearing body oil baffle comprises a support frame and a bearing oil baffle tooth assembly. The support frame is sleeved on the main shaft, and one end of the support frame is fitted with the bearing. The bearing oil baffle tooth assembly is arranged on the inner side of the support frame to prevent lubricating oil from leaking from the side of the bearing away from the generator to the side close to the generator.

2. The end cover bearing generator oil leakage prevention combined structure according to claim 1 is characterized in that: Also includes: The end cover oil baffle assembly includes a high-pressure gas chamber and an external oil baffle tooth assembly close to one side of the generator, wherein the inner wall of the high-pressure gas chamber is close to the main shaft and is provided with a circumferential gap. After the high-pressure gas passes through the circumferential gap from the high-pressure gas chamber, it is ejected along the outer surface of the main shaft in the direction away from and close to the generator; an external oil baffle tooth assembly is provided on the surface of the inner wall of the high-pressure gas chamber facing the main shaft.

3. The end cover bearing generator oil leakage prevention combined structure according to claim 2 is characterized in that: The outer oil stop gear assembly comprises a first sub-oil stop gear assembly and a second sub-oil stop gear assembly, which are respectively arranged on both sides of the circumferential gap.

4. The end cover bearing generator oil leakage prevention combined structure according to claim 2 is characterized in that: The high-pressure gas chamber is provided with a pipeline for introducing high-pressure gas, and the pipeline for introducing high-pressure gas is connected to a compressed air source or an air outlet of a generator cooling fan.

5. The end cover bearing generator oil leakage prevention combined structure according to claim 3 is characterized in that: It also includes a wind choke cover, which is fixed on the end face of the end cover oil baffle assembly close to the generator. After reserving a clearance for the axial movement of the rotor, the cover extends axially and is close to the end face of the cooling fan hub.

6. The end cover bearing generator oil leakage prevention combined structure according to claim 2 is characterized in that: The end cover oil baffle assembly also includes an atmospheric balance chamber and an internal oil baffle tooth assembly away from the generator side. The atmospheric balance chamber and the high-pressure gas chamber are arranged in sequence along the axial direction of the main shaft. The atmospheric balance chamber is connected to the atmosphere through an atmospheric balance pipe. The part of the high-pressure gas sprayed in the direction away from the generator passes through the atmospheric balance chamber, flows out of the end cover oil baffle assembly and enters the bearing box; the internal oil baffle tooth assembly is arranged on the inner surface of the end wall of the end cover oil baffle assembly away from the generator and close to the main shaft.

7. The end cover bearing generator oil leakage prevention combined structure according to claim 6 is characterized in that: The outer pipe opening of the atmospheric balance pipe is provided with a filter screen.

8. The end cover bearing generator oil leakage prevention combined structure according to claim 6 is characterized in that: The atmospheric balance pipe is connected to a pressure detection device for detecting and adjusting the airtight effect of high-pressure gas.

9. The end cover bearing generator oil leakage prevention combined structure according to claim 2 is characterized in that: The bearing body oil baffle is connected to the end cover oil baffle assembly or the bearing. When connected to the end cover oil baffle assembly, an insulating pad is provided on the joint surface of the end cover oil baffle assembly and the bearing box.

10. The end cover bearing generator oil leakage prevention combined structure according to claim 1, characterized in that: The upper cover of the bearing box is provided with a connecting pipe connected to the turbine fan to suck the oil smoke from the bearing box into the main oil tank of the lubricating oil.

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