Smoke filtering structure of steam turbine bearing box

Abstract

The utility model provides a smoke filtering structure of a steam turbine bearing box, and belongs to the technical field of steam turbines. The problem that an existing oil return structure is complex is solved. The smoke filtering structure of the steam turbine bearing box comprises a smoke discharging cylinder and a filtering cylinder, a plurality of first vent holes are distributed in the cylindrical surface of the filtering cylinder, a conical oil collecting hopper is arranged at the upper end of the filtering cylinder, an oil leaking hole is formed in the lower end of the oil collecting hopper, and a conical filtering hopper is arranged above the filtering cylinder. A plurality of second vent holes are distributed in the conical surface of the filtering hopper, the conical point of the filtering hopper faces downwards, the filtering hopper is fixed to the inner wall of the smoke discharging barrel, and the oil collecting hopper is located below the lower end of the filtering hopper; the lower end face of the smoke discharging cylinder is attached to the upper surface of the first turned edge, an annular oil collecting groove is formed in the middle of the first turned edge, and an oil return hole is formed in the inner bottom face of the oil collecting groove. Compared with the prior art, the structure has the advantages that the design of an oil return structure is obviously simplified, and the flue gas filtering structure is convenient to assemble and manufacture.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, in particular to a smoke filtering structure of a steam turbine bearing box. Background Art

[0002] When the steam turbine rotates at high speed, the friction between the coupling and the lubricating oil in the steam turbine generates heat. The lubricating oil contains gas. When the temperature rises, the gas in the lubricating oil forms smoke. If the smoke is not discharged in time, it will easily cause the pressure in the bearing box to be too high, and then cause oil leakage. The existing method is to set a smoke exhaust structure on the bearing box, and the smoke in the bearing box is discharged to the outside through the smoke exhaust structure.

[0003] At present, the China Patent Network discloses a smoke exhaust device for a turbine bearing box [Authorization Announcement No.: CN216691193U], including a main unit and a smoke exhaust duct installed at the smoke exhaust port, the baffle unit includes a conical plate arranged inside the smoke exhaust duct, and a plurality of through holes annularly distributed on the conical plate, the cone point of the conical plate is arranged upward, the baffle unit also includes an oil return assembly arranged on the bottom side of the conical plate, which includes an annular pad fixedly connected to the inner wall of the smoke exhaust duct, the annular pad is provided with a plurality of oil return holes, the plurality of oil return holes are distributed in a uniform annular array, the oil return assembly also includes an oil retaining ring arranged on the annular pad, the oil retaining ring is located at the inner ring position of the annular pad and is integrally formed with the annular pad, the oil return assembly also includes an oil guide ring arranged on the annular pad, the oil guide ring is provided with a plurality of oil guide holes corresponding to the oil return holes one by one, the inner wall of the smoke exhaust duct is fixedly provided with oil return pipes equal in number to the oil return holes, and the oil return pipes are located directly below the oil return holes.

[0004] The above-mentioned smoke exhaust device has the following defects: the cone point of the conical plate is set upward, and the oil droplets on the conical plate all flow to the outer edge of the conical plate, and then a complex oil return structure is set between the outer edge of the conical plate and the inner wall of the main unit, making the overall structure of the smoke exhaust device more complicated. Summary of the invention

[0005] The purpose of the utility model is to solve the above problems in the existing technology and propose a flue gas filtering structure for a turbine bearing box. The technical problem to be solved by the utility model is: how to solve the problem that the existing oil return structure is relatively complicated.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A flue gas filtering structure for a turbine bearing box includes a smoke exhaust pipe, characterized in that the smoke filtering structure also includes a filter cartridge arranged in the smoke exhaust pipe, a plurality of ventilation holes 1 are distributed on the cylindrical surface of the filter cartridge, a conical oil collecting bucket is arranged at the upper end of the filter cartridge, the cone point of the oil collecting bucket faces downward and the oil collecting bucket extends into the filter cartridge, the lower end of the oil collecting bucket has an oil leakage hole, a conical filter cartridge is arranged above the filter cartridge, a plurality of ventilation holes 2 are distributed on the conical surface of the filter bucket, the cone point of the filter bucket faces downward and the filter bucket is fixed on the inner wall of the smoke exhaust pipe, the oil collecting bucket is located below the lower end of the filter bucket; the lower end of the filter cartridge has a flange 1, the lower end surface of the smoke exhaust pipe is in contact with the upper surface of the flange 1, an annular oil collecting groove is provided in the middle part of the flange 1, and an oil return hole is provided on the inner bottom surface of the oil collecting groove.

[0008] The smoke filter structure is installed on the bearing box. The smoke with oil first enters the filter cartridge and fully contacts the inner circumference of the filter cartridge, so that oil droplets condense on the inner circumference of the filter cartridge, and the oil droplets flow down and drip into the bearing box; the smoke in the filter cartridge also contacts the outer conical surface of the oil collecting bucket, so that oil droplets condense on the outer conical surface of the oil collecting bucket, and the oil droplets flow down along the outer conical surface of the oil collecting bucket and drip into the bearing box. After the smoke is filtered by the filter cartridge, it enters the exhaust pipe through the vent hole. During the process of the smoke flowing upward through the filter bucket, the smoke fully contacts the outer conical surface of the filter bucket, so that oil droplets condense on the outer conical surface of the filter bucket, and the oil droplets flow down and drip into the oil collecting bucket. The oil in the oil collecting bucket drips into the bearing box through the oil leakage hole. In addition, the smoke entering the smoke exhaust pipe is in full contact with the inner circumference of the smoke exhaust pipe and the outer circumference of the filter cartridge, so that oil droplets condense on the inner circumference of the smoke exhaust pipe and the outer circumference of the filter cartridge, and the oil droplets flow downward and flow into the oil collecting tank, and the oil in the oil collecting tank drips into the bearing box through the oil return hole. This structure adopts a combined filtering structure of the filter cartridge and the filter bucket. On the one hand, the smoke can contact a relatively large contact area and can fully filter the lubricating oil in the smoke. On the other hand, the oil droplets of the lubricating oil drip directly into the bearing box, which significantly simplifies the design of the oil return structure compared with the prior art, and facilitates the assembly and manufacture of the smoke filter structure.

[0009] In the above-mentioned flue gas filtering structure of a steam turbine bearing box, the upper end of the oil collecting hopper has an annular limiting flange, and the lower surface of the limiting flange is in contact with the upper end surface of the filter cartridge. Through the arrangement of this structure, the oil collecting hopper is directly placed on the upper end of the filter cartridge, which is convenient for assembly. In order to increase the stability of the installation, the limiting flange and the upper end of the filter cartridge can be welded.

[0010] In the above-mentioned smoke filter structure of a steam turbine bearing box, the inner wall of the smoke exhaust pipe has a positioning flange, the upper end of the filter bucket has an annular mounting flange, and the lower surface of the mounting flange fits the upper surface of the positioning flange. Through the arrangement of this structure, the filter bucket is easy to install, and thus the assembly of the smoke exhaust filter structure is convenient.

[0011] In the above-mentioned flue gas filtering structure of a turbine bearing box, the inner and outer edges of the upper end of the oil collecting groove are both provided with chamfers. Through the setting of this structure, the setting of the chamfers facilitates the lubricating oil dripping on the upper surface of the flange to be guided into the oil collecting groove.

[0012] In the above-mentioned flue gas filtering structure of a steam turbine bearing box, the oil return hole is in an arc shape, and there are at least three oil return holes, all of which are arranged at intervals along the circumference of the filter cylinder. Through the arrangement of this structure, the arrangement of multiple oil return holes allows the lubricating oil in the oil collection tank to drip quickly into the bearing box.

[0013] In the above-mentioned smoke filter structure of a turbine bearing box, the lower end of the smoke exhaust pipe has flange 2, the lower surface of flange 2 is in contact with the upper surface of flange 1, mounting hole 1 is provided on flange 1, mounting hole 2 is provided on flange 2, and mounting hole 1 is coaxially arranged with mounting hole 2. Through the arrangement of this structure, fasteners can pass through mounting hole 1 and mounting hole 2 to fix the smoke exhaust pipe and the filter cartridge on the bearing box, which is convenient for installation.

[0014] In the above-mentioned smoke filtering structure of a steam turbine bearing box, the upper end of the smoke exhaust pipe is connected with a smoke exhaust hood. Through the arrangement of this structure, the smoke exhaust hood is used to discharge the filtered smoke to the outside.

[0015] Compared with the prior art, the flue gas filtering structure of the turbine bearing box of the utility model has the following advantages: the structure adopts a combined filtering structure of a filter cartridge and a filter bucket, which, on the one hand, allows the flue gas to contact a relatively large contact area and can fully filter the lubricating oil in the flue gas; on the other hand, the lubricating oil droplets directly drip into the bearing box, which significantly simplifies the design of the oil return structure compared with the prior art and facilitates the assembly and manufacture of the flue gas filtering structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0019] Figure 4It is a three-dimensional structural schematic diagram of the filter cartridge of the utility model.

[0020] In the figure, 1. smoke exhaust pipe; 2. filter cylinder; 20. vent hole one; 21. flange one; 22. oil collecting trough; 23. oil return hole; 24. chamfer; 3. oil collecting hopper; 30. oil leakage hole; 31. limiting flange; 4. filter hopper; 40. vent hole two; 41. mounting flange; 5. positioning flange; 6. flange two; 7. mounting hole one; 8. mounting hole two; 9. smoke exhaust hood. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1 to Figure 4 As shown, the smoke filtering structure of the turbine bearing box includes a smoke exhaust pipe 1, the upper end of the smoke exhaust pipe 1 is connected to a smoke exhaust cover 9, the smoke filtering structure also includes a filter cartridge 2 arranged in the smoke exhaust pipe 1, a plurality of vent holes 20 are distributed on the cylindrical surface of the filter cartridge 2, a conical oil collecting hopper 3 is arranged on the upper end of the filter cartridge 2, the cone point of the oil collecting hopper 3 faces downward and the oil collecting hopper 3 extends into the filter cartridge 2, the lower end of the oil collecting hopper 3 has an oil leakage hole 30, a conical filter cartridge 4 is arranged above the filter cartridge 2, a plurality of vent holes 40 are distributed on the conical surface of the filter cartridge 4, and a plurality of vent holes 40 are distributed on the conical surface of the filter cartridge 4. The cone point of the filter bucket 4 faces downward and the filter bucket 4 is fixed on the inner wall of the smoke exhaust pipe 1, and the oil collecting bucket 3 is located below the lower end of the filter bucket 4; the lower end of the filter cylinder 2 has a flange 21, and the lower end surface of the smoke exhaust pipe 1 is in contact with the upper surface of the flange 21. An annular oil collecting groove 22 is provided in the middle of the flange 21, and the inner and outer edges of the upper end of the oil collecting groove 22 are provided with oblique chamfers 24. An oil return hole 23 is provided on the inner bottom surface of the oil collecting groove 22. The oil return hole 23 is in an arc shape. There are at least three oil return holes 23, and all oil return holes 23 are arranged at intervals along the circumference of the filter cylinder 2.

[0023] The smoke filter structure is installed on the bearing box. The smoke with oil first enters the filter cartridge 2 and fully contacts the inner circumference of the filter cartridge 2, so that oil droplets condense on the inner circumference of the filter cartridge 2, and the oil droplets flow down and drip into the bearing box; the smoke in the filter cartridge 2 also contacts the outer conical surface of the oil collecting bucket 3, so that oil droplets condense on the outer conical surface of the oil collecting bucket 3, and the oil droplets flow down along the outer conical surface of the oil collecting bucket 3 and drip into the bearing box. After being filtered by the filter cartridge 2, the smoke enters the exhaust pipe 1 through the vent hole 20. During the process of the smoke flowing upward through the filter bucket 4, the smoke fully contacts the outer conical surface of the filter bucket 4, so that oil droplets condense on the outer conical surface of the filter bucket 4, and the oil droplets flow down and drip into the oil collecting bucket. The oil in the oil collecting bucket 3 drips into the bearing box through the oil leakage hole 30. In addition, the smoke entering the smoke exhaust pipe 1 is in full contact with the inner circumference of the smoke exhaust pipe 1 and the outer circumference of the filter tube 2, so that oil droplets condense on the inner circumference of the smoke exhaust pipe 1 and the outer circumference of the filter tube 2, and the oil droplets flow downward and flow into the oil collecting tank 22, and the oil in the oil collecting tank 22 drips into the bearing box through the oil return hole 23. This structure adopts a combined filtering structure of the filter tube 2 and the filter bucket 4. On the one hand, the smoke can contact a relatively large contact area and can fully filter the lubricating oil in the smoke. On the other hand, the oil droplets of the lubricating oil directly drip into the bearing box, which significantly simplifies the design of the oil return structure compared with the prior art, and facilitates the assembly and manufacture of the smoke filtering structure.

[0024] Furthermore, the upper end of the oil collecting bucket 3 has an annular limiting flange 31, and the lower surface of the limiting flange 31 fits with the upper end surface of the filter cartridge 2. The inner wall of the smoke exhaust pipe 1 has a positioning flange 5, and the upper end of the filter bucket 4 has an annular mounting flange 41, and the lower surface of the mounting flange 41 fits with the upper surface of the positioning flange 5.

[0025] like Figure 3 As shown, the lower end of the smoke exhaust pipe 1 has a flange 26, the lower surface of the flange 26 is in contact with the upper surface of the flange 1 21, the flange 1 21 is provided with a mounting hole 1 7, the flange 26 is provided with a mounting hole 2 8, and the mounting hole 1 7 is coaxially arranged with the mounting hole 2 8.

[0026] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A flue gas filtering structure for a steam turbine bearing box, comprising a smoke exhaust pipe (1), characterized in that: The smoke filtering structure also includes a filter cartridge (2) arranged in the smoke exhaust tube (1), a plurality of ventilation holes (20) are distributed on the cylindrical surface of the filter cartridge (2), a conical oil collecting bucket (3) is arranged at the upper end of the filter cartridge (2), the cone point of the oil collecting bucket (3) faces downward and the oil collecting bucket (3) extends into the filter cartridge (2), the lower end of the oil collecting bucket (3) has an oil leakage hole (30), and a conical filter cartridge (4) is arranged above the filter cartridge (2), and the conical surface of the filter cartridge (4) is divided into A plurality of ventilation holes (40) are arranged, the cone point of the filter bucket (4) faces downward and the filter bucket (4) is fixed on the inner wall of the smoke exhaust pipe (1), and the oil collecting bucket (3) is located below the lower end of the filter bucket (4); the lower end of the filter cartridge (2) has a flange (21), the lower end surface of the smoke exhaust pipe (1) is in contact with the upper surface of the flange (21), and an annular oil collecting groove (22) is provided in the middle of the flange (21), and an oil return hole (23) is provided on the inner bottom surface of the oil collecting groove (22).

2. The flue gas filtering structure of a steam turbine bearing box according to claim 1, characterized in that: The upper end of the oil collecting hopper (3) is provided with an annular limiting flange (31), and the lower surface of the limiting flange (31) is in contact with the upper end surface of the filter cartridge (2).

3. The flue gas filtering structure of a steam turbine bearing box according to claim 1, characterized in that: The inner wall of the smoke exhaust pipe (1) is provided with a positioning flange (5), and the upper end of the filter bucket (4) is provided with an annular mounting flange (41), and the lower surface of the mounting flange (41) is in contact with the upper surface of the positioning flange (5).

4. The flue gas filtering structure of a steam turbine bearing box according to claim 1, characterized in that: The inner and outer edges of the upper end of the oil collecting groove (22) are both provided with chamfers (24).

5. The flue gas filtering structure of a steam turbine bearing box according to claim 1, characterized in that: The oil return holes (23) are in an arc shape, and there are at least three of the oil return holes (23). All the oil return holes (23) are arranged at intervals along the circumference of the filter cartridge (2).

6. The flue gas filtering structure of a steam turbine bearing box according to claim 1, characterized in that: The lower end of the smoke exhaust pipe (1) has a flange 2 (6), the lower surface of the flange 2 (6) is in contact with the upper surface of the flange 1 (21), the flange 1 (21) is provided with a mounting hole 1 (7), the flange 2 (6) is provided with a mounting hole 2 (8), and the mounting hole 1 (7) and the mounting hole 2 (8) are coaxially arranged.

7. The flue gas filtering structure of a steam turbine bearing box according to claim 1, characterized in that: The upper end of the smoke exhaust tube (1) is connected to a smoke exhaust hood (9).

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